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.

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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.

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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.