CNMOULDINGs: Professional Two-Shot Overmolding Mold Manufacturer

 CNMOULDINGs is a high-tech enterprise specializing in the design, production, and machining of two-shot overmolding molds. With years of industry experience and advanced manufacturing technology, we are committed to providing high-quality, high-precision two-shot injection mold solutions for industries such as consumer electronics, medical devices, automotive parts, and home appliances.

Core Business: Two-Shot Overmolding Molds

Two-shot overmolding (also known as dual-material or multi-material molding) is an advanced injection molding process that combines two different plastics or colors in a single production cycle, enhancing product functionality, aesthetics, and durability. CNMOULDINGs excels in this field with the following advantages:

Precision Design & Engineering

Utilizes CAD/CAE/CAM software for mold structure optimization, ensuring stability and accuracy in injection molding.

Supports complex two-shot designs, including soft/hard material bonding, multi-color combinations, and transparent/opaque integrations.

High-Quality Materials & Processes

Uses premium mold steels (e.g., S136, 718H) with heat and surface treatments to extend mold lifespan.

Strict control of injection parameters to eliminate weld lines, air bubbles, or delamination.

Diverse Applications

Consumer Electronics: Phone buttons, earphone casings, wearable devices.

Automotive Parts: Dual-color buttons, seals, interior components.

Medical Devices: Non-slip grips, soft-touch housings.

Household Items: Toothbrush handles, tool grips.

Technical Advantages

Two-Shot Molding Machines: Compatible with rotary plate, core-back, and other two-shot molding methods.

Rapid Prototyping & Mass Production: Short lead time from design to trial molding, accelerating time-to-market.

Strict QC System: Ensures dimensional and functional accuracy via 3D scanning, CMM, and other inspection methods.

Service Commitment

CNMOULDINGs prioritizes customer needs, offering one-stop solutions:

Mold design consultation → Production & machining → Trial molding → Mass production support.

Flexible customization for both small batches and large-scale manufacturing.

Contact Us

For professional two-shot overmolding solutions, CNMOULDINGs is your trusted partner! Visit our website or contact us directly for technical details and case studies.

CNMOULDING: Professional Insert Molding Manufacturer – High-Precision, High-Strength Insert Molding Solutions

 CNMOULDING is a high-tech enterprise specializing in the design, manufacturing, and production of insert molding (Insert Molding) molds. We are committed to providing global customers with high-precision, high-stability insert molding solutions for applications in automotive, electronics, medical, home appliances, and industrial components.

With advanced machining equipment, extensive industry experience, and a strict quality control system, CNMOULDING has become a long-term partner for many renowned companies worldwide, offering one-stop services from mold development to mass production.

Key Advantages of Insert Molding

Insert molding is an efficient process where metal or non-metal inserts (such as nuts, screws, terminals, or sensors) are pre-placed into the mold and then encapsulated with plastic. Compared to traditional assembly methods, CNMOULDING’s insert molding technology offers the following benefits:

1. High-Strength Bonding: The plastic encapsulates the insert with high strength, ensuring superior pull-out force and torque resistance, thereby preventing any loosening or detachment.  

2. Cost Efficiency: By eliminating post-molding assembly processes, this method reduces labor costs and minimizes assembly errors, thus significantly enhancing production efficiency.  

3. High-Precision Molding: Precision-engineered molds guarantee accurate positioning of the insert and uniform encapsulation of the plastic, meeting stringent engineering requirements.  

4. Wide Insert Compatibility: This technology supports a variety of materials for inserts, including metals (such as copper, aluminum, and stainless steel) and non-metallic options, addressing diverse industry needs.  

5. Material Versatility: It is compatible with both thermoplastics (e.g., ABS, PC, PA, POM) and thermosetting plastics (e.g., phenolic resins), fulfilling various performance requirements across applications.  

CNMOULDING’s Core Competencies

1. Advanced Mold Design and Manufacturing  

CAD/CAM/CAE simulation is utilized to optimize the mold structure, ensuring stability and enhancing the accuracy of insert positioning.  

High-precision CNC machining, EDM (Electrical Discharge Machining), and mirror polishing are employed to guarantee mold durability and superior product surface quality.  

2. Mature Insert Molding Process  

Automated systems for insert placement improve production efficiency and maintain consistency in manufacturing processes.  

Rigorous process control over parameters such as temperature, pressure, and injection speed effectively prevents issues like insert misalignment and insufficient plastic filling.  

3. Rigorous Quality Inspection  

Advanced inspection methods, including 3D scanning, pull-out tests, torque tests, and others, ensure that the bonding strength of inserts complies with industry standards (ISO 9001, IATF 16949).  

4. Wide Industry Applications  

Automotive: Sensor housings, connectors, gear assemblies  

Electronics: PCB inserts, switch components, heat dissipation modules  

Medical Devices: Surgical instrument handles, disposable medical inserts  

Home Appliances: Buttons, fasteners, structural parts  

Why Choose CNMOULDING?

🔹 30+ Years of Experience – Successfully served 500+ global customers in insert molding.

🔹 Rapid Response – Efficient project support from mold design to mass production.

🔹 Cost Optimization – Process improvements reduce scrap rates and save costs.

🔹 Custom Solutions – Tailored services including multi-cavity molds, hot runner systems, and automated insert placement.

Contact Us

If you are looking for a reliable insert molding supplier, CNMOULDING is your ideal partner! Contact us for customized solutions, professional technical support, and high-quality service.

CNMOULDING: Professional Soft Rubber Product Solutions Provider

 As a company specializing in soft rubber product design, mold development, and manufacturing, CNMOULDING leverages extensive industry experience and technical expertise to provide one-stop soft rubber product solutions, including customized production using various materials such as silicone, TPU, and TPE.  

CNMOULDING’s Core Advantages  

one. Diverse Material Options to Meet Various Needs

We offer a wide range of soft rubber materials, including:  

Food-grade silicone (FDA/LFGB compliant, suitable for baby products and kitchenware)  

High-elasticity TPU (wear-resistant, tear-resistant, ideal for sports gear and industrial components)  

Eco-friendly TPE (recyclable, low hardness, perfect for medical devices and electronic accessories)  

Special-performance soft rubber (custom options for high-temperature resistance, flame retardancy, conductivity, etc.)  

two. Precision Mold Development Ensures Product Quality  

High-precision CNC machining and 3D printing mold flow analysis optimize mold structure  

Support for multi-cavity and stack mold designs to improve production efficiency  

Capable of producing ultra-thin soft rubber parts (as thin as 0.2mm)** to meet high-precision requirements  

three. Advanced Manufacturing Processes Guarantee Performance  

Liquid Silicone Rubber (LSR) Injection Molding—Ideal for high-precision medical and electronic components  

Solid Silicone Compression Molding—Suitable for high-temperature kitchenware and seals  

TPU/TPE Injection Molding—Used for anti-slip grips, sports protectors, etc.  

Overmolding (Two-Shot Molding)—Combines hard and soft rubber for enhanced functionality  

four. Strict Quality Control Complies with International Standards  

ISO 9001 certification ensures standardized production processes  

RoHS/REACH compliance testing meets export requirements  

Physical performance testing (tensile strength, tear resistance, temperature resistance, etc.)  

Why Choose CNMOULDING?

End-to-end support from design to mass production—DFM (Design for Manufacturability) analysis optimizes product structure  

Rapid prototyping and small-batch production—Shortens product development cycles  

Cost-optimized solutions—Material selection and process improvements reduce overall costs  

Global logistics support—Stable supply chain for markets in Europe, America, Asia, and beyond  

CNMOULDING—Your Trusted Soft Rubber Manufacturing Partner!

How to Address the Issue of Thin and Easily Broken Ejector Pins in Injection Molds

 1. Optimize the Ejection Process  

Adjust ejection parameters to minimize stress on delicate ejector pins.  

Reduce ejection speed: Excessively high ejection speeds generate significant impact forces, increasing the risk of breakage in thin ejector pins. A moderate reduction in speed can mitigate this risk.  

Implement multi-stage ejection: Utilize the multi-stage ejection capability of the injection molding machine. Initiate the first stage at a low speed and short stroke to release vacuum adhesion, followed by standard ejection in the second stage. This approach effectively reduces peak impact loads.  

Verify ejection stroke: Ensure the stroke is precisely calibrated to fully eject the part without over-extension, which may cause the ejector pin to lose guidance support and become unstable.  

Maintain proper lubrication: Regularly apply high-temperature mold release oil to the ejector pins to minimize friction between the pins and the mold core.

2. Revise Mold Design  

The most effective and long-term solution is to replace fragile, undersized thimbles with larger-diameter counterparts.  

This modification requires adjustments to the hole positions in both the mold core and the ejector plate. Although this involves higher initial costs, it provides a durable and reliable resolution.

3. Modify Ejection Methodology  

When spatial constraints prevent increasing the pin diameter, alternative ejection mechanisms should be considered.  

Use flat thimbles: In narrow regions such as rib areas, flat thimbles offer a greater cross-sectional area and superior resistance to bending compared to round thimbles.  

For boss columns with high shrinkage forces, employ stripper pins, which provide a broader and more uniform ejection surface.  

For deep cavities or thin-walled parts, consider air-assisted ejection systems. These introduce compressed air from within the cavity to disrupt vacuum formation, significantly reducing demolding resistance.  

Apply push plate ejection: For large, deep-container components, push plates offer full-surface contact, distributing ejection force evenly and minimizing localized stress compared to point-contact ejector pins.

4. Enhance Mold Structural Integrity  

Incorporate guide pillars: Install guide sleeves on the ejector plate to ensure precise alignment and smooth movement of the ejector system, thereby preventing lateral shear forces due to misalignment.  

Polish ejector pin bores: Inspect and refinish worn pin holes to reduce friction and improve operational smoothness.  

Inspect for and correct undercuts: Conduct a thorough mold inspection to identify any unintended undercuts that may contribute to excessive part retention force, and rectify them accordingly.

What Causes Corrosion in Metal Inserts within Plastic Products?

 Environmental Factors

Exposure to certain environments is the most common cause of corrosion.

Moisture/Humidity: The presence of water triggers the oxidation of iron (rust). In humid conditions, moisture condenses on the metal surface, initiating corrosion.

Chlorides: Exposure to salt (e.g., from coastal air, sweat, or deicing salts) drastically accelerates corrosion, causing severe "salt-induced rusting."

Acids/Alkalis: Contact with cleaning agents, sweat, or industrial chemicals can break down the metal's protective surface layer, increasing corrosion risk.

Insert-Specific Factors

The metal's inherent properties are critical.

Material: Carbon steel rusts easily unless protected. Some stainless steel grades (e.g., low-quality types) may still corrode in harsh environments.

Surface Coating: A lack of coating, or a poor-quality one (e.g., thin, porous plating like zinc or nickel), provides inadequate defense. Damage during handling also creates weak points for rust to start.

Design & Manufacturing Factors

The integration and assembly process plays a key role.

Residual Stress from Molding: The high heat of insert molding and subsequent cooling can create internal stress in the metal, making it more prone to "stress corrosion."

Over-Tightening during Assembly: Excessive force can strip protective coatings and create micro-cracks, offering a path for corrosion.

Galvanic Corrosion: If the insert contacts a different metal (e.g., an aluminum part) in a moist environment, an electrochemical reaction can rapidly corrode the less noble metal.

IV. Other Influences

Additional factors can contribute to the problem.

Plastic Properties: Some plastics (like PVC) can release acidic substances over time, which may slowly attack the metal.

Storage/Transport: Damp warehouses or inadequate packaging can expose products to moisture long before they reach the end user.

Summary of Mitigation Strategies

Material Selection: Choose appropriate corrosion-resistant alloys, such as 304 or 316 stainless steel, for the expected environment.

Surface Treatment: If using carbon steel, apply high-quality coatings like Dacromet or zinc phosphating, which are superior to standard electroplating.

Process Control: Optimize molding and assembly processes to minimize residual stress and avoid damaging the inserts.

Environmental Management: Control storage humidity and use protective packaging to limit exposure to moisture.

Overcoming Smart Bracelet Screw Corrosion: A Targeted Solution

 A smart bracelet we produced for a quality-focused Italian client recently faced a critical test: embedded metal screws began to rust during use. This issue, while seemingly small, compromised both the product's appearance and its long-term reliability.

Screw corrosion is a common challenge in wearables, typically resulting from a combination of factors:

Sweat Exposure: Frequent contact with skin exposes the screws to sweat, whose moisture and salts steadily corrode any weak points in the metal's protection.

Material Vulnerability: Previously used carbon steel screws with electroplated zinc were cost-effective, but the coating could be thin or easily damaged, allowing sweat to penetrate and cause rust.

Manufacturing Stress: The high heat of the molding process creates residual stress in the screws as the plastic cools, making the metal more prone to corrosion.

Implemented Solutions:

Improved Mold Design: We redesigned the mold to ensure the plastic encapsulates the screw more completely, minimizing its exposure to air and moisture.

Superior Screw Material: We replaced the carbon steel with AISI 304 stainless steel, which has a self-repairing protective oxide layer that resists sweat and corrosion.

Better Plastics: We switched to more stable, less moisture-absorbent engineering plastics to reduce the corrosive elements in the immediate environment.

We thank our client for their valuable feedback. This solution underscores our commitment to continuous improvement and delivering durable, high-quality products.

plastic bar handle

 

• Plastic Handle and Plastic Bar
• Price:2USD/SET
• Delivery Time within 30 days, 100K
• Product description: Cn-moulding has 10 years of experience produce plastics handle and plastic bar mold and parts in china. It through injection molding and ultrasonic welding technic

The development of the Chinese fitness equipment industry began in the 20th century in the late 1980s. With China’s accession to WTO and the success of Beijing’s bid for the development of the fitness equipment industry. Providing favorable conditions and opportunities for development, customer demand for plastic products, rapid growth.
Such as various types of plastic handle plastic bar.

China’s fitness equipment industry in the rapid development of a number of issues is increasingly apparent. Especially the lack of well-known brands in the international market, low value-added products. While compared with the international advanced level, many Chinese injection molds and plastic products manufacturing enterprises are still in the generic production stage. A lack of product development and technological innovation. In the consumer area, compared with Europe and other developed countries, fitness equipment products in household penetration and per capita consumption is still very low for fitness. Fitness equipment, plastic products in the Chinese market is still small.

Therefore, Chinese enterprises must seize the new injection mold development situation, increase scientific and technological innovation, and strive to improve the quality of plastic products, strengthening R & D capabilities and strengthen after-sales service. The only way to be invincible in the new situation.

CNMOULDING focus on all kinds of fitness equipment, plastic molds, and plastic products, we as supporting long-term supplier for many famous foreign companies supporting the production of sports equipment, all kinds of plastic molds and related plastic products If you need our help, please immediately contact our sales manager.

What is injection Moulding used for?

 

Plastic Injection Molding service

The process can produce precise complex plastic products action of a gram to more than a hundred
kilograms, in virtually any plastic material. The process starts with feeding small plastic beads into a
heated screw and barrel system that melts the plastic into a high–viscosity liquid. The screw then
forces the molten plastic into a closed mold that provides the shape, cooling, and solidification, and
finally ejects the part. China Injection molding is fast and can be economical. But because every part
needs its own costly injection molding tool, the process is economically viable only for mass production,
usually more than 10,000 parts.

China Injection molding tools take weeks to build. Often, design mistakes become apparent, requiring
time–consuming mold corrections. Multiple iterations may go from the producer to the tool builder until the final
part design and quality are achieved, increasing costs and product time to market.

What is injection Moulding used

Plastic Injection molding is a method of producing parts with a heat-melt able plastics material.

 This is done by the use of a plastic injection molding machine. The shape which is produced is controlled by
what is called a “mold china” The plastic injection molding machine has two basic parts; the injection unit,
which melts the plastic and then injects or moves it into the mold, and the clamping unit, which holds the
mold. The unit clamps the mold in a closed position during injection, opens the mold after cooling, and ejects the finished part.

 Materials  can be used in a process called china injection molding

 These are thermoplastics such as polystyrene, nylon, polypropylene, and polythene – this means when
they are heated and then pressured in a mould they can be formed into different shapes. China injection
molding unit seen opposite has been made in one piece using this process An animation of an injection
moulding process is shown below. Injection moldings count for a significant proportion of all plastics
products from micro parts to large components such as bumpers and wheelie bins.  Virtually all sectors
of manufacturing use injection molded parts – the flexibility in size and shape possible through the use
of this process have consistently extended the boundaries of design in plastics and enabled the significant
replacement of traditional materials thanks to light-weighting and design freedom.  The table below shows
the type of products that can be injection moulded but is by no means comprehensive.

Plastic Injection Molding service industry include following

 1,Assemblies

2,Consumer Products
 3,Containers
 4,Medical / Dental Disposable
 5,Electrical / Computer Parts
 6,Food & Beverage
 7,Insertion Molding
 8,Living Hinge

List products that have been manufactured through injection moulding. Reference article for china injection molding companies 

china plastic injection molding

 

 China plastic injection molding-tooling for injection molds

CNMOULDING is one of the few plastic injection mold makers in China that specialize in manufacturing cost-effective custom injection molding and custom design tooling in China for injection molded plastic parts, compression molds, overmolding, and molds for investment casting. Innovative custom design tooling solutions such as our CAD plastic injection mold design services in China. Our custom design tooling manufacturing in China. Tooling for export program ensures a low upfront cost, high-quality solution for our client’s custom design tooling projects.

Tooling and mold making in China is our preferred manufacturing method for our customers when the time will allow. We feel by offering custom design tooling in China. We are able to give our customers quality steel tools for the price they would pay for aluminum tools in the US or Europe. We can make molds and tools in China to run at our plastics facilities, or to ship to your location.

 

We offer custom design tooling for OEMs, end-users, injection-molded plastics shops. And injection mold makers at our engineering facilities in China. Our experienced engineers allow us to maintain the high quality of our injection mold makers’ design services while keeping costs low. We also work with many U.S. And European design firms producing tools for them and will not sell our design services to their customers.

CNMOULDING designs and manufactures its clients’ custom tools. Die’s and molds to their specifications, produce new molds from its customers’ CAD files, or reverse engineer existing parts. As one of the premier injection mold makers, we are very proficient at reverse engineering many types of parts. We have many different 3D design software platforms to adapt to our customers’ systems. Digital data files and computerized machining are used almost exclusively for the tooling of custom molds.

For small and extremely large parts, which can be manufactured specifically for small or dedicated long-run production molds, provide high-quality custom design tooling. CNMOULDING is one of the best custom design tooling manufacturers in China, specializing in die and tooling design and tooling for export. We can manufacture tools that are multi-cavity molds, unscrewing molds, closure molds, hot-runner molds, and stack molds.

Custom Tooling for Export

Custom tooling for export to the U.S. and other countries is becoming more popular. CNMOULDING builds a large portion of its custom design tools for export. Our clients have found that they can save 50-70% on tooling by having us manufacture the tools for them in China and export them to their facility, a local plastic shop, or our plastic injection molding facility. By making the molds in China customers can reduce their initial investment substantially, and allocate that revenue towards extra inventory if they choose.

CNMOULDING ensures 100% satisfaction with our tools. Detailed drawings are provided for customer approvals, and we always provide prototypes for first article approval prior to packaging and shipping the tools. Custom tools are also designed to fit in whatever injection molding equipment our customers or their suppliers might have. Those dimensions are obtained from our customers prior to finalizing pricing and drawings.
Send us your next custom tooling project for a free reference quote from our factory. We guarantee you will be impressed with the quality and savings!

CNMOULDING: Professional Soft Rubber Product Solutions Provider

 As a company specializing in soft rubber product design, mold development, and manufacturing, CNMOULDING leverages extensive industry experience and technical expertise to provide one-stop soft rubber product solutions, including customized production using various materials such as silicone, TPU, and TPE.  

CNMOULDING’s Core Advantages  

one. Diverse Material Options to Meet Various Needs

We offer a wide range of soft rubber materials, including:  

Food-grade silicone (FDA/LFGB compliant, suitable for baby products and kitchenware)  

High-elasticity TPU (wear-resistant, tear-resistant, ideal for sports gear and industrial components)  

Eco-friendly TPE (recyclable, low hardness, perfect for medical devices and electronic accessories)  

Special-performance soft rubber (custom options for high-temperature resistance, flame retardancy, conductivity, etc.)  

two. Precision Mold Development Ensures Product Quality  

High-precision CNC machining and 3D printing mold flow analysis optimize mold structure  

Support for multi-cavity and stack mold designs to improve production efficiency  

Capable of producing ultra-thin soft rubber parts (as thin as 0.2mm)** to meet high-precision requirements  

three. Advanced Manufacturing Processes Guarantee Performance  

Liquid Silicone Rubber (LSR) Injection Molding—Ideal for high-precision medical and electronic components  

Solid Silicone Compression Molding—Suitable for high-temperature kitchenware and seals  

TPU/TPE Injection Molding—Used for anti-slip grips, sports protectors, etc.  

Overmolding (Two-Shot Molding)—Combines hard and soft rubber for enhanced functionality  

four. Strict Quality Control Complies with International Standards  

ISO 9001 certification ensures standardized production processes  

RoHS/REACH compliance testing meets export requirements  

Physical performance testing (tensile strength, tear resistance, temperature resistance, etc.)  

Why Choose CNMOULDING?

End-to-end support from design to mass production—DFM (Design for Manufacturability) analysis optimizes product structure  

Rapid prototyping and small-batch production—Shortens product development cycles  

Cost-optimized solutions—Material selection and process improvements reduce overall costs  

Global logistics support—Stable supply chain for markets in Europe, America, Asia, and beyond  

Contact Us for Professional Soft Rubber Solutions!  

TEL: 86-21-52913487

FAX: 86-21-59907980

WhatsApp/Wechat: +8613061707408

Email: webmaster@cnmoulding.com  

CNMOULDING—Your Trusted Soft Rubber Manufacturing Partner!

CNMOULDING -- Professional TPE Injection Molding Solutions Provider

 CNMOULDING is a high-tech enterprise specializing in TPE (thermoplastic elastomer) injection molding, committed to offering customers comprehensive one-stop services ranging from material development, mold design, injection molding to finished product assembly. Equipped with advanced production equipment, a stringent quality control system, and extensive industry expertise, we have established long-term partnerships with numerous internationally renowned brands.  

Core Advantages  

One. Advanced TPE Injection Molding Technology  

    Utilizing all-electric injection molding machines and high-precision molds to ensure consistent product dimensions and smooth surface finishes.  

   Supporting Overmolding and 2K Molding processes, achieving robust bonding between TPE and materials such as PP, ABS, and PC.  

   Customizable TPE materials with varying hardness levels (Shore A 0-100), color options, transparency, and specialized properties (e.g., flame retardancy, UV resistance, oil resistance, etc.).  

Two. Rigorous Quality Control  

   Certified under the ISO 9001 quality management system to ensure standardized production processes.  

   Conducting comprehensive testing throughout the entire production cycle, including physical property evaluations (tensile strength, tear resistance, rebound resilience, etc.) and environmental compliance assessments (ROHS, REACH, FDA).  

   Providing PPAP (Production Part Approval Process) and IQC/OQC quality control measures to meet the stringent requirements of industries such as automotive and medical.  

Three. Swift Response and Flexible Production 

   Capable of supporting small-scale trial production to large-scale mass production, adapting flexibly to customer demands.  

   Featuring an in-house mold workshop that offers mold design, development, and optimization services to expedite delivery timelines.  

   A fully integrated supply chain ensures a stable supply of raw materials while minimizing production costs.  

Application Fields of TPE Injection Molding  

Automotive Components: Sealing strips, dust covers, interior components.  

Electronics and Appliances: Cable sheaths, headphone housings, keyboard pads.  

Daily Consumer Goods: Toothbrush handles, kitchenware grips, toys.  

Medical Supplies: Breathing masks, infusion tubes, medical gaskets.  

Why Choose CNMOULDING?  

Professional Team: With over 10 years of experience in TPE injection molding, our team provides expert advice on material selection and process optimization.  

High Cost-Effectiveness: By optimizing production processes and reducing defect rates, we assist customers in effectively controlling costs.  

Full-Service Solution: From design support and mold development to mass production delivery and after-sales tracking, we offer a seamless and worry-free experience.  

Global Supply Capability: Our products are exported to international markets, including Europe, the United States, Japan, and South Korea, adhering to global environmental protection and safety standards.  

CNMOULDING-Professional Medical Transparent Plastic Injection Molding Solutions

 CNMOULDING As a specialized manufacturer of medical-grade transparent plastic injection molding products, we leverage advanced production equipment, stringent quality control systems, and extensive industry expertise to deliver high-quality, safe, and reliable transparent plastic components for medical devices, pharmaceutical packaging, and laboratory consumables. Our products are widely used in syringes, infusion sets, reagent bottles, Petri dishes, transparent protective shields, and other medical applications, complying with international standards such as GMP and ISO 13485.

Core Products & Services

1. Medical-Grade Transparent Plastic Injection Molded Products

We use premium medical-grade PP (polypropylene), PC (polycarbonate), PETG (glycol-modified PET), and PMMA (acrylic) to produce high-clarity, chemically stable, low-leachate plastic components, ensuring safety and biocompatibility when in contact with pharmaceuticals and bodily fluids.

Key Products Include:

Medical Device Components: Syringe barrels, infusion three-way valves, nebulizer housings, etc.

Lab Consumables: Centrifuge tubes, PCR plates, specimen containers, etc.

Protective Equipment: Face shields, goggles, transparent isolation barriers, etc.

Packaging Solutions: Medicine bottles, blister packs, sealing caps, etc.

2. Custom Development Capabilities

Precision Molding: Microgram-level precision parts with tolerances as tight as ±0.01mm.

Cleanroom Production: Sterile manufacturing in Class 10,000 cleanrooms for critical applications.

Surface Treatments: Anti-fog, anti-static, UV-cured coatings, and other specialized finishes.

3. Rigorous Quality Assurance

Traceable raw materials compliant with USP Class VI, FDA 21 CFR, and other certifications.

Full-process testing: Light transmittance, chemical resistance, biocompatibility validation, etc.

Sterilization validation support (EO, gamma irradiation, etc.).

Industry Advantages

Medical Specialization: 30+ years of experience in medical injection molding.

Rapid Response: One-stop service from mold design to mass production.

Regulatory Compliance: Assistance with product registration and documentation.

Contact Us

For OEM/ODM services in medical transparent plastic products, we offer cost-effective, high-reliability solutions.

Professional Plastic Injection Molds & Manufacturing – Specialized in Refrigerator Drawer Production

 We are a specialized factory focused on plastic injection mold manufacturing and injection molding production, dedicated to providing high-precision, high-quality plastic components for the home appliance industry. With years of industry experience and advanced production technology, we have become a reliable partner in the field of refrigerator parts manufacturing, particularly excelling in the R&D and production of refrigerator drawers. We offer comprehensive solutions from mold design to mass production.

Core Advantages

Precision Mold Manufacturing

A professional mold design team utilizing CAD/CAM/CAE technology to optimize structure, ensuring mold accuracy and longevity.

Fully equipped with advanced machinery (CNC, EDM, wire-cutting, etc.), capable of producing complex injection molds tailored to various refrigerator drawer requirements.

Efficient Injection Molding

Equipped with fully automatic injection molding machines (80T-1000T), supporting materials such as PP, ABS, PS, PC, and more, meeting food-grade, low-temperature resistance, and high-toughness demands.

Strict process control ensures dimensional stability and surface finish, preventing defects like warping and shrinkage.

Specialized Refrigerator Drawer Expertise

Extensive experience in producing slide-out drawers, transparent drawers, and multi-layer storage drawers, with ergonomic designs (anti-slip textures, snap-fit structures, silent opening/closing).

Rigorous testing for low-temperature resistance (-30°C), load-bearing capacity, and drop impact, complying with home appliance safety standards.

One-Stop Service

Customization support: Material selection, structural optimization, color matching, logo engraving, and more to meet diverse needs.

Full-process quality control from mold development to mass production, accelerating time-to-market.

Quality Assurance

Strict adherence to ISO 9001 quality management system, with full inspection of mold precision, part dimensions, and functionality.

Equipped with CMM, tensile testers, and other equipment to ensure batch consistency.

Industries We Serve

We work with domestic and international refrigerator manufacturers and home appliance parts suppliers, with products widely used in household and commercial refrigeration. We also undertake orders for precision plastic parts in automotive components, daily necessities, and more.

The Role and Working Principle of Lifters in Molds

 1. Definition of a Lifter

A lifter is a common ejection mechanism in injection molds, primarily used to address demolding challenges caused by undercuts in plastic parts. It operates through an angled movement (typically driven by an angle pin or guide rail) during mold opening, allowing the part to be released smoothly without sticking or damage.  

2. Functions of Lifters 

(1) Resolving Undercut Demolding Issues  

-When a plastic part has internal recesses, side holes, or snap-fit features, standard ejector pins cannot release it directly. Lifters provide lateral movement to clear the undercut, enabling successful ejection.  

(2) Simplifying Mold Structure and Reducing Costs  

Compared to sliders or hydraulic core pulls, lifters have a simpler design, making them cost-effective for small to moderately complex undercuts.  

(3) Improving Production Efficiency  

Lifter movement is automatically controlled by mold opening/closing, eliminating the need for external power sources (e.g., hydraulics or pneumatics), making them ideal for high-speed injection molding.  

(4) Enhancing Product Aesthetics

- Lifters are usually placed on non-cosmetic surfaces (e.g., inner sides or bottoms) to avoid visible parting lines or ejection marks.  

3. Working Principle of Lifters

Lifter movement relies on mold opening, following this typical process:  

1. Mold Closing  

   - The lifter remains stationary during injection to ensure proper part formation.  

2. Mold Opening  

   - As the mold opens, the lifter is pushed by the ejector plate while being guided by an angle pin or rail, forcing it to move at an angle.  

3. Ejection Completion  

   - The lifter slides at a predetermined angle (usually 5°–25°) to clear the undercut, followed by full part ejection via ejector pins.  

Schematic: 

Mold closed → Mold opens → Lifter moves along angle pin → Clears undercut → Part ejected  

4. Common Types of Lifters  

(1) Standard Lifter  

- Driven by an angle pin, suitable for simple undercuts.  

(2) Delayed Lifter 

- Remains stationary initially, then moves at an angle later, ideal for complex undercuts or multi-stage ejection.  

(3) Hydraulic Lifter

- Powered by a hydraulic cylinder, used for long strokes or high-precision applications (less common, often replaced by sliders).  

(4) Two-Stage Lifter  

- Uses dual motion (lateral shift followed by ejection) for deep cavities or special geometries.  

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5. Key Design Considerations for Lifters

(1) Angle Selection 

- The lifter angle (typically 5°–25°) must balance ease of ejection with wear resistance. Too shallow an angle may cause sticking; too steep may lead to jamming.  

(2) Material and Heat Treatment  

- Lifters are often made of hardened steel (e.g., SKD61, H13) and heat-treated (HRC 48–52) for durability.  

(3) Lubrication and Guidance  

- Wear plates or oil grooves reduce friction and extend lifter lifespan.  

(4) Stroke Calculation  

- The ejection stroke must exceed the undercut depth to ensure complete release.  

6. Conclusion  

Lifters are essential in mold design, particularly for plastic parts with undercuts. Their simplicity, cost efficiency, and reliability make them widely used in electronics, appliances, automotive components, and more. Proper design of angles, materials, and motion ensures longer mold life and higher product quality.  

Precision injection molding characteristics

 

Precision injection molding characteristics

     The Precision injection molding is generally referred to as the precision of forming parts and surface quality is demanding high technology, some people think that precision injection is the size of plastic parts to achieve the accuracy of 0.01 ~ 0.001 mm injection molding process. In recent years, with the electronic, medical, communications, automotive, and other industries. With the rapid development of people’s plastic products, high precision, high-performance requirements. The traditional plastic molding process has been difficult to meet the current high standards. Is one of the most important plastics molding methods. Therefore, precision injection molding technology more and more people’s attention. Making precision injection molding technology continues to progress, new technology continues to emerge. Factors that affect precision injection molding require high dimensional accuracy, low warpage, excellent transfer characteristics, and excellent optical properties.

Therefore, it is on the injection molding machine, injection mold, molding process, raw material properties. And formulations have special requirements, affecting the many factors of precision injection molding. According to the current actual production point of view, the impact of precision injection molding factors are the following aspects:

1. Plastic shrinkage design of precision plastic products, plastic shrinkage should be considered.
2. The shape and size of the product The shape and size of the plastic parts have a great impact on the accuracy of the parts, the production practice shows that the more complex the shape of the product and the larger the size, the lower the accuracy
3. Mold structure The accuracy of plastic parts and mold cavity number and production volume are closely related. It is also shown that the accuracy of the single-cavity mold structure is higher than that of the multi-cavity mold, and the accuracy of small-mass production is higher than that of large quantities.

CNMOULDING: Professional Insert Molding Manufacturer – High-Precision, High-Strength Insert Molding Solutions

 CNMOULDING is a high-tech enterprise specializing in the design, manufacturing, and production of insert molding (Insert Molding) molds. We are committed to providing global customers with high-precision, high-stability insert molding solutions for applications in automotive, electronics, medical, home appliances, and industrial components.

With advanced machining equipment, extensive industry experience, and a strict quality control system, CNMOULDING has become a long-term partner for many renowned companies worldwide, offering one-stop services from mold development to mass production.

Key Advantages of Insert Molding

Insert molding is an efficient process where metal or non-metal inserts (such as nuts, screws, terminals, or sensors) are pre-placed into the mold and then encapsulated with plastic. Compared to traditional assembly methods, CNMOULDING’s insert molding technology offers the following benefits:

1. High-Strength Bonding: The plastic encapsulates the insert with high strength, ensuring superior pull-out force and torque resistance, thereby preventing any loosening or detachment.  

2. Cost Efficiency: By eliminating post-molding assembly processes, this method reduces labor costs and minimizes assembly errors, thus significantly enhancing production efficiency.  

3. High-Precision Molding: Precision-engineered molds guarantee accurate positioning of the insert and uniform encapsulation of the plastic, meeting stringent engineering requirements.  

4. Wide Insert Compatibility: This technology supports a variety of materials for inserts, including metals (such as copper, aluminum, and stainless steel) and non-metallic options, addressing diverse industry needs.  

5. Material Versatility: It is compatible with both thermoplastics (e.g., ABS, PC, PA, POM) and thermosetting plastics (e.g., phenolic resins), fulfilling various performance requirements across applications.  

CNMOULDING’s Core Competencies

1. Advanced Mold Design and Manufacturing  

CAD/CAM/CAE simulation is utilized to optimize the mold structure, ensuring stability and enhancing the accuracy of insert positioning.  

High-precision CNC machining, EDM (Electrical Discharge Machining), and mirror polishing are employed to guarantee mold durability and superior product surface quality.  

2. Mature Insert Molding Process  

Automated systems for insert placement improve production efficiency and maintain consistency in manufacturing processes.  

Rigorous process control over parameters such as temperature, pressure, and injection speed effectively prevents issues like insert misalignment and insufficient plastic filling.  

3. Rigorous Quality Inspection  

Advanced inspection methods, including 3D scanning, pull-out tests, torque tests, and others, ensure that the bonding strength of inserts complies with industry standards (ISO 9001, IATF 16949).  

4. Wide Industry Applications  

Automotive: Sensor housings, connectors, gear assemblies  

Electronics: PCB inserts, switch components, heat dissipation modules  

Medical Devices: Surgical instrument handles, disposable medical inserts  

Home Appliances: Buttons, fasteners, structural parts  

Why Choose CNMOULDING?

🔹 30+ Years of Experience – Successfully served 500+ global customers in insert molding.

🔹 Rapid Response – Efficient project support from mold design to mass production.

🔹 Cost Optimization – Process improvements reduce scrap rates and save costs.

🔹 Custom Solutions – Tailored services including multi-cavity molds, hot runner systems, and automated insert placement.

Contact Us

If you are looking for a reliable insert molding supplier, CNMOULDING is your ideal partner! Contact us for customized solutions, professional technical support, and high-quality service.

Phone: +86-021-52913487

Email: webmaster@cnmoulding.com

Website: www.cnmoulding.com

CNMOULDING – Your Expert in Precision Insert Molding, Enhancing Product Competitiveness!

Reliable high quality mold making company

 

CNMOULDING is a  professional plastic mold manufacturer in China

      As a full-service contract plastic mold manufacturer in China, we can provide turnkey solutions for your plastic product manufacturing needs. From product design support through order fulfillment and distribution, PMP offers our clientele a multitude of services. including:

Product Design Support

High Quality  Made Tooling in china

Insert & Over-Molding in china

In-Mold Decorating, Pad Printing & Plating

Product Design

A plastic mold manufacturer in China will assist your engineering team in optimizing your product design to
aid in its manufacturability, strength, and quality. High Quality  Made Tooling in China. From Single cavity
and double Inserts to Multi-cavity Hot Runner Molds, Precision Molded Plastics contributes to the GDP of China.

We do not outsource from another supplier. Molded-in mechanical fasteners or highly conductive electronic connectors, Plastic mold manufacturer china will be molded Plastics provides technical service solutions to exceed your every need.

Value-Added Services of plastic mold manufacturer china

    In-mold decorating, labeling, pad printing, or chrome plating; Plastic mold manufacturer china possesses the skills and resources to handle any of your product’s secondary needs. Secondary Operations Machining
Operations and/or hardware installation; We’ll build your sub-assemblies and ship them ready for integration
into the final product.Complete Assemblies Injection molding, product assembly, retail packaging& distribution,
Plastic mold manufacturer in china provides turn-key contract manufacturing fulfillment services.

We work closely with our customers assessing both short and long term requirements. If you require china
overmolding, china insert molding, or china two-shot molding, Plastic mold manufacturer china has the
experience to create the tooling and molding processes to get your job done right. Material properties and
plastic technology are very important when developing precision injection molded parts. When your part has
to meet the specific regulations of your industry, having the right material is essential. The correct storage, handling,
drying, and processing of today’s highly engineered resins is critical to the production of precision molded parts.
Plastic injection molders in china. we pay attention to all aspects of the molding process, from tooling and material to machine and processing

 

How to choose a plastic injection mold manufacturer

mold making company is very popular with everyone’s attention at the moment, it is not particularly suitable for direct
production of some products that can be made of plastic models, produced under a single customer after
making the decision, both for the convenience and efficiency is high, so are as many customers, so if you
choose plastic mold manufacturers to cooperate, in the end how to choose?

 
Select  plastic mold manufacturers to cooperate, then there are a few caveats if you can pay attention to the good,
then you can find the best manufacturers of cooperation, the first thing to note is that the manufacturers of
credibility, if appeared before manufacturers specified when not completed within the time, then we better
take account of, or the customer may not see the model when they took it out.

 
Choose plastic mold manufacturers also need to pay attention is sure to look at how manufacturers of
equipment, is now the model-making equipment is also in constant update them, 3D printers can also
be said to be very common, if the manufacturer of the device relatively aging words may be made out
of many models have some defects

How to be a good mold maker and high quality mold making  company in china

 First important, we own 8 CNC machines, 6 wire cutters, 8 milling machines,  6 EDM machines, and outside good
supply chain allows our experienced mold makers to meet compressed lead times while maintaining our
reputation for quality injection molding making.From single cavity & prototype injection molding making  
to multi-cavity and family injection molding making.
 

Mold maker in china is fully equipped to meet your unique tooling challenges

 Our mold making shop is geared to work with injection molds from the small to medium to big size range, i.e.
injection mold makers that are designed to run in presses of 800 tons and smaller. China  mold makers work
with a variety of plastic injection molding making configurations and a summary of available options can be
found here Mold Types:
 
Injection mold designing, injection molding making, and specialty tooling have been the backbone of our
business since our inception in 2002. We apply our decade of expertise in producing precision injection
mold. We are particularly adept at tooling for Automotive, Printer, Electronic precision, and. Medical
Connector Parts.

mold making company

china mould maker, china mold making, china mold makers, mold makers in china
above 4 hot tag usually for customer search/find good mold manufacturer in china.
 

Cn-moulding means Plastic Injection Molding manufacturers in China

Description of Injection Molds

 Product Name: Plastic injection mold Mold core&cavity steel: NAK 80, 718, P20,H13,2344, etc. Mold base: LKM, HASCO, DME, etc. Mold life: 200k-1 million shots Packaging: Wooden case Delivery time: 25-60 days.

 Our factory has five sets of CNC machining centers. Up to 30,000 rpm spindle machining centers. P. M. speed
CNC machining centers. 9 to CNC EDM machines and 5 WEDM. CMM has the function of reverse scan data
to ensure mold production in a timely, effective, and accurate completion of the process design. It can produce pulled stamping dies, automotive testing tools, and thermoplastic molding tools. The core of the injection molding shop’s annual production capacity of 400 sets of precision injection molds or 800 sets of ordinary medium-sized injection molds our service is a one-stop injection molding manufacturer solutions company for polymer-based products.

We focus on plastics design, plastic injection molding manufacturing, tight tolerance molding, part joining and assembly, and painting, and serve a number of markets including Medical-Diagnostic, Industrial, Electronics, Communication, Consumer, and Automotive.  we are always manufacturing highly- demanding and tight-tolerance precision parts for industries such as the automotive, banking, and healthcare industries. And we are able to offer our customers a quick turnaround and
high-quality injection molds, prototyping, and plastic injection molding manufacturing services.

 Our mold making company’s Competitive Advantages:

Electronic Online Experienced Engineer Guarantee within 7 days. International Approvals Military Specifications Quotation 1-day Product Features Product Performance Prompt Delivery Quality. Approvals Reputation Service 24 hours of project Control.

Globe Markets:

Eastern EuropeNorth AmericaMid EastCentral/South AmericaSouth AfricaWestern Europe-Australia
 Welcome to provide samples or 2D / 3D drawing in step, XMT or IGES 3D drawing type, or AutoCAD and PDF
type. We can design and produce the molds need. If you want to compare prices, find a very professional injection mold company’s products in China. Please send the information to us you are interested, we will give you a good price report. This will be our big pleasure if we have a chance for your services.

Cn-moulding is a quality mold maker in China

 

China mold maker

Cn-moulding is a quality mold maker in China

Different from other companies or foreign mold makers. We have 30 years of real export mold making experience, and in our mold workshop for you to strive for first-class mold quality. We know it’s hard to find a cheap good mold maker in China, but stop searching, and purchasing is not as difficult as you think in Cnmoulding. Just contact the sales manager of the company to ask you a question. Of course, there is a lot of competition in China. There may be 25000 Chinese mold makers in this market. But our mold makers have some outstanding experience and truly innovative thinking. We tell you the secret of the industry: professional mold makers can’t make all kinds of molds. They’re just good at one type of mold.

All kinds of molds are produced in China

 

As a mold maker in china we are able to design and manufacture molds and products to our customer’s specifications, produce new molds from their CAD files, or reverse engineer plastic parts. We have many different 3D design software platforms to adapt to our customers’ systems. The ability to reverse engineer existing molds and molded parts allows us to build new and improved custom tooling for our customers.

No matter what your product looks like, or how much you need to make your parts or components: we can make small and medium-sized molds, even large ones or molds, for complex parts with many sliders, and two parts. Mould and family mould. If you need an aluminum prototype mold for the short term we are also your supplier, with mud molding and aluminum inserts, we are ready for cheap short injection molding.

 

General Rules:

These ratios are estimates only. The pricing can vary greatly with cavitation and the complexity of the parts and second operations. Second Operations can involve anything from cleaning parts, overmolding, painting, drilling holes, pad printing, screen printing, partial sub-assemblies, etc. Please mail or call us to get a specific quote on your part.

Freight – The larger the parts become, the more of a factor freight from China becomes. Therefore, if parts can not be “nested” well medium and larger parts become much more expensive in China.

Volume – In general, we can run any pieces per run per shipment. For less expensive parts, the volume requirement may be much higher.

Lead Time – Production lead-time is about 3-5 weeks for our production, but for freight, you must add on 4-6 weeks. Buying container loads will greatly reduce your freight costs.

Injection Molds Sourcing

China mold maker

Quality mold makers are able to complete your task of purchasing parts other than injection parts: usually for every project. You need to buy parts made from injection molds. In addition, you buy components from all over the world or from other non-mold makers in cities in China. The inconvenient management makes the quality of this task difficult to guarantee, specifically referring to the quality of various parts after assembly. And we are not only a standard China mold maker. We offer more procurement services and purchase services than the traditional “Mold makers in China”, and you can find our true injection Mold maker on the Google home page or on purchasing websites such as “Made in China”. Assist you to buy non-plastic parts, such as electronic parts, printing, plastic packaging, etc. This is a free service. You can find injection mold makers in Zhejiang or Shanghai.

CNMOULDING is a China mold maker, I. e., a mold maker in China, used in thermoplastic plastics in medical, automotive, and other industries. If you want to find a mold maker on GOOGLE in a particular city. You can also enter the “mold maker “, but be careful not to encounter a liar. In short, our company is a good Chinese mold maker, when you need to buy injection molds in China, we will save you money and trouble. We have a special article on how to identify true and false injection molding companies on GOOGLE.