Medical Injection Molding

 

Medical Injection Molding

 

Professional Medical Plastic Injection Molding Manufacturer in China

Medical injection molding is a highly specialized manufacturing process used to produce precision plastic components for medical devices and healthcare applications. Compared with standard plastic manufacturing, medical injection molding requires higher standards in terms of precision, material safety, cleanliness, and quality control.

At CNMOULDING, we provide professional medical plastic injection molding services for global medical device manufacturers. With more than 20 years of experience in injection mold manufacturing and plastic molding production, we support customers from product development to mass production.

Our engineering team works closely with medical companies to ensure that every component meets strict requirements for precision, reliability, and performance.

Medical Plastic Parts We Produce

Injection molding technology is widely used in the medical industry because it allows the production of complex plastic components with excellent consistency and high production efficiency.

We manufacture a wide range of medical injection molded parts, including:

• Medical device housings

• Syringe components

• IV connectors and fittings

• Diagnostic equipment components

• Laboratory consumables

• Drug delivery device components

• Surgical instrument components

• Medical electronic housings

These products require tight dimensional tolerances, high surface quality, and reliable production stability.

[caption id="attachment_4758" align="alignnone" width="300"] Medical Injection Molding | Medical Plastic Injection Molding Manufacturer[/caption]

Medical Grade Plastic Materials

Selecting the correct material is critical in medical injection molding. Medical components must often meet strict requirements for biocompatibility, chemical resistance, and sterilization compatibility.

Common materials used in medical injection molding include:

• Polycarbonate (PC) – high strength and transparency

• Polypropylene (PP) – widely used for disposable medical products

• Polyethylene (PE) – chemical resistance and flexibility

• POM (Polyoxymethylene) – high precision and low friction

• Medical-grade ABS – good mechanical performance

• TPE (Thermoplastic Elastomer) – soft-touch and sealing applications

Material selection depends on the specific medical application and product requirements.

Precision Medical Injection Mold Design

Medical parts often require extremely tight tolerances and high dimensional accuracy. Our mold engineers carefully design each mold to ensure optimal performance during production.

Key aspects of medical mold design include:

• Mold flow analysis for balanced filling

• Precision cavity and core machining

• Optimized gate and runner systems

• Efficient cooling channel design

• Reliable part ejection systems

These design strategies help reduce defects such as warpage, sink marks, and short shots during production.

Clean Manufacturing Environment

Medical products often require a controlled manufacturing environment to ensure product safety and quality.

Our medical injection molding production can support clean manufacturing requirements to ensure:

• Reduced contamination risk

• Stable production conditions

• High product consistency

Strict process control and clean production practices help ensure that medical plastic components meet industry standards.

Quality Control for Medical Injection Molding

Quality control is critical in the production of medical plastic parts. At CNMOULDING, we implement comprehensive quality management procedures throughout the manufacturing process.

Our quality control measures include:

• Mold design verification

• Precision inspection of mold components

• Mold trial testing and validation

• Dimensional inspection using precision equipment

• Production process monitoring

These procedures ensure consistent product quality and reliable production performance.

Medical Injection Mold Manufacturing Capabilities

Our factory is equipped with advanced mold manufacturing equipment and injection molding machines to support the production of high-precision medical components.

Our capabilities include:

• High-precision CNC machining

• EDM and wire cutting

• Multi-cavity mold manufacturing

• Hot runner mold systems

• Mirror polishing for optical parts

• Mold testing and validation

These capabilities allow us to produce molds that support stable and efficient mass production.

Medical Product Development Process

We provide full support throughout the medical product development cycle.

Our typical development process includes:

1. Product design review

2. DFM (Design for Manufacturability) analysis

3. Mold design

4. Mold manufacturing

5. Mold trial and validation

6. Injection molding production

This process ensures that each project moves efficiently from concept to production.

Why Choose CNMOULDING for Medical Injection Molding

• Over 20 years of injection mold manufacturing experience

• Professional engineering and mold design team

• Advanced precision machining equipment

• Strict quality control procedures

• Competitive manufacturing cost

• Reliable production and fast lead times

We are committed to helping medical device manufacturers develop reliable plastic components with efficient and stable production.

 

Request a Quote for Medical Injection Molding

If you are developing medical devices or healthcare products and need a reliable medical injection molding manufacturer, CNMOULDING can provide professional mold design and injection molding production services.

Contact our team today to discuss your project and receive a quotation.

Medical Injection Mold

  

[ Medical Mold[/caption]

Professional Medical Plastic Injection Mold Manufacturer in China

Medical plastic injection molds are used to manufacture high-precision plastic components for medical devices and healthcare products. These molds require extremely high standards in terms of precision, material safety, and manufacturing consistency.

At CNMOULDING, we specialize in the design and manufacturing of medical plastic injection molds for global medical device manufacturers. With more than 20 years of mold manufacturing experience, our engineering team is capable of developing complex molds that meet strict medical industry requirements.

Our molds are used to produce a wide range of medical plastic components with reliable quality and stable production performance.

Medical Plastic Parts We Manufacture

Injection molding is widely used in the medical industry because it allows the production of complex plastic parts with high precision and excellent repeatability.

Typical medical plastic components include:

• Medical device housings

• Diagnostic equipment components

• Syringe components

• Laboratory plastic consumables

• Medical connectors and fittings

• Surgical instrument parts

• Drug delivery device components

These products often require tight tolerances, high surface quality, and strict dimensional control.

Medical Injection Mold Design

Medical injection mold design requires extensive engineering expertise to ensure both product performance and manufacturability. Our mold design engineers carefully analyze product structures and production requirements to optimize mold design.

Key design considerations include:

• High precision cavity and core machining

• Proper gate and runner system design

• Balanced filling and mold flow analysis

• Efficient cooling system design

• Reliable ejection mechanisms

Through advanced mold design techniques, we ensure consistent part quality and stable production.

Materials Used in Medical Injection Molding

Medical plastic components are typically manufactured using high-performance materials that meet strict safety and durability requirements.

Common medical plastics include:

• Polycarbonate (PC)

• Polypropylene (PP)

• Polyethylene (PE)

• Polyoxymethylene (POM)

• Medical-grade ABS

• Thermoplastic elastomers (TPE)

Material selection depends on the specific medical application, sterilization requirements, and mechanical properties needed for the product.

Precision Manufacturing for Medical Molds

Manufacturing medical injection molds requires high precision machining and strict quality control procedures. At CNMOULDING, our mold manufacturing process uses advanced equipment to ensure excellent accuracy and durability.

Our capabilities include:

• High-precision CNC machining

• EDM and wire cutting

• Mirror polishing for optical surfaces

• Multi-cavity mold manufacturing

• Hot runner mold systems

• Mold testing and validation

Each mold undergoes thorough inspection and testing before production.

Quality Control for Medical Mold Production

Medical products require extremely strict quality control standards. Our team follows comprehensive quality procedures throughout mold manufacturing and injection molding production.

Quality control measures include:

• Mold design verification

• Dimensional inspection of mold components

• Mold trial testing

• Product measurement and inspection

• Production process monitoring

These steps ensure that the molds meet customer specifications and produce consistent medical components.

Applications of Medical Injection Molds

Medical injection molding is widely used in healthcare and medical device manufacturing.

Applications include:

• Diagnostic equipment

• Drug delivery systems

• Laboratory testing devices

• Medical consumables

• Surgical devices

Injection molding provides the precision, reliability, and scalability required for modern medical product manufacturing.

Why Choose CNMOULDING for Medical Injection Molds

• Over 20 years of injection mold manufacturing experience

• Professional engineering and mold design team

• Advanced mold manufacturing equipment

• Reliable quality control procedures

• Competitive cost and efficient production

We work closely with customers to develop high-quality medical injection molds that support efficient and reliable manufacturing.

Request a Quote for Medical Injection Molds

If you are looking for a reliable medical injection mold manufacturer in China, CNMOULDING can provide professional mold design and manufacturing services for your medical products.

Injection Mold Cost Guide

 

How Much Does a Plastic Injection Mold Cost?

One of the most common questions product developers ask when starting a manufacturing project is:

How much does an injection mold cost?

The cost of a plastic injection mold can vary widely depending on part complexity, mold size, material requirements, and production volume. Some molds may cost only a few thousand dollars, while complex molds for automotive or medical applications can exceed $50,000 or more.

Understanding the factors that affect injection mold cost can help companies better plan their manufacturing budget and avoid unnecessary expenses during product development.

At CNMOULDING, a Shanghai-based mold manufacturer established in 1997, we have produced hundreds of plastic injection molds for global customers in automotive, electronics, and medical industries. Through years of mold design and manufacturing experience, we have seen how smart engineering decisions can significantly reduce tooling costs.

In this guide, we explain typical injection mold price ranges and the key factors that influence mold manufacturing cost.

Typical Injection Mold Cost Range

Injection mold costs vary depending on mold complexity and production requirements. The following ranges reflect common pricing in the manufacturing industry.

Prototype Mold

Typical cost:

$1,000 – $5,000

Prototype molds are designed for product testing or small production runs. These molds often use simplified structures and may be made from aluminum or softer mold steels.

They allow companies to verify product design before investing in a full production mold.

Standard Production Mold

Typical cost:

$5,000 – $30,000

This is the most common mold type used for consumer products and industrial components.

Production molds are usually made from durable steel materials such as P20 or H13 and are designed for long-term manufacturing.

High-Precision or Multi-Cavity Mold

Typical cost:

$30,000 – $100,000+

Complex molds may include multiple cavities, sliding mechanisms, or high precision requirements.

These molds are often used in industries such as:

• automotive components

• medical devices

• electronics housings

Although the initial investment is higher, multi-cavity molds can significantly reduce per-part production costs.

6 Key Factors That Affect Injection Mold Cost

Several engineering factors determine the final cost of an injection mold.

1 Part Complexity

The geometry of the plastic part has the biggest impact on mold cost.

Features that increase mold complexity include:

• undercuts

• side holes

• complex ribs

• tight tolerances

These features often require additional mold mechanisms such as sliders or lifters, which increase both design and manufacturing time.

2 Mold Size

Larger plastic parts require larger molds and larger injection molding machines.

A bigger mold means:

• more steel material

• longer machining time

• more complex assembly

As mold size increases, manufacturing cost rises accordingly.

3 Mold Steel Selection

The type of steel used in mold manufacturing significantly affects tooling cost and mold durability.

Common mold steels include:

Steel Type	Typical Use
P20	General production molds
H13	High-temperature or abrasive materials
S136	Medical or high-polish applications

Higher-grade steels increase tooling cost but extend mold life and improve product quality.

4 Number of Cavities

Multi-cavity molds allow manufacturers to produce several parts in one injection cycle.

Advantages include:

• higher production efficiency

• lower per-part cost

However, increasing cavity numbers also increases mold complexity and tooling cost.

5 Surface Finish Requirements

Products that require high cosmetic quality—such as consumer electronics housings—often need mirror polishing or textured surfaces.

These finishing processes require additional machining and polishing work, increasing mold manufacturing cost.

6 Production Volume

Production volume strongly influences mold design decisions.

For example:

• small production runs may use simpler molds

• high-volume production requires stronger mold materials and more robust structures

Choosing the right mold structure for the expected production volume helps optimize tooling investment.

Real Case Study: Automotive Connector Mold

A European automotive supplier contacted our Shanghai engineering team to develop an injection mold for a PA66 glass-fiber reinforced connector housing.

Project Requirements

Material: PA66 GF30
Production volume: 600,000 parts per year
Tolerance requirement: high precision

Initial Cost Estimate

The customer initially planned to use a standard mold design with P20 steel.

Estimated tooling cost:

$22,000

However, because the material contained glass fiber reinforcement, mold wear would likely occur quickly with P20 steel.

Engineering Optimization

Our engineering team recommended several improvements:

• upgrading the mold steel to H13

• optimizing gate design for balanced filling

• improving cooling channel layout

Although these upgrades increased the initial tooling cost slightly, they significantly improved mold durability.

Final Results

The final mold cost was approximately $27,000, but the mold life increased dramatically and production stability improved.

The mold successfully produced over 500,000 parts with minimal maintenance.

In the long term, the customer saved significant costs by avoiding frequent mold repairs and production downtime.

How to Reduce Injection Mold Cost

Companies can reduce tooling costs by optimizing product design and manufacturing strategy.

Some effective methods include:

Simplify Part Design

Reducing unnecessary undercuts or complex features lowers mold complexity.

Maintain Uniform Wall Thickness

Uniform wall thickness improves molding stability and reduces the need for complex mold structures.

Use DFM Analysis Early

Design for Manufacturing analysis helps identify potential problems before mold production begins.

Choose the Right Mold Steel

Selecting the appropriate steel based on production volume helps balance tooling cost and mold durability.

Why Work With an Experienced Mold Manufacturer

Injection mold manufacturing requires specialized engineering expertise. An experienced mold manufacturer can help optimize mold design, reduce production risks, and ensure stable mass production.

At CNMOULDING, our Shanghai factory provides complete services including:

• injection mold design

• mold manufacturing

• plastic injection molding production

• mold testing and quality inspection

Our facility operates under strict quality systems including:

• ISO9001 certification

• ISO13485 certification for medical device manufacturing

With more than 25 years of experience, we support global customers with reliable mold manufacturing solutions.

Start Your Injection Mold Project

If you are planning a new plastic product and want to estimate injection mold cost, our engineering team can review your design and provide professional recommendations.

Contact our Shanghai team today to discuss your project and receive expert support for injection mold manufacturing and plastic injection molding production.

 

 

Clear transparent plastics

 

• Clear transparent plastics.
• Clear plastic part.
• Transparent plastic products.
• SAN,PMMA,PS,PC raw material.
• Medical, Consumer, Automotive, Electronic Industrial.
• Product description: Rich experience producing transparent plastics part mold and part in china. It needs high-quality requests for the injection molding control process.

Specifications of transparent injection molding material

Clear transparent plastics characteristics: transparent insulation thermoplastic environmental protection plastic products, plastic transparent. After burning the odorless tasteless. It does not produce poisonous gas. Transparent, surface water ripple, crystal point, ones like white, grease, and toughness. And strong resistance, chemical resistance, good resistance to impact strength. Low-temperature resistance to impact strength is also good. Is about 20% higher than the PVC standard). Used for blister, folding boxes, packaging, printing, CARDS, etc.

Transparent insulation use of transparent insulation is used in electronics, printing, packaging, insulation, soft lines. A display screen saver PET, membrane switch, membrane Windows, printing film, puzzle film base, stickers bottom paper, glue. Silicon coating, belt, instrument panel, cable capacitance motor gasket. Insulation stripping, furniture, window film, protective film inkjet printing. And decoration, etc. PC transparent insulation slices are double-sided polishing film, have good pervious to light quality, and high dimensional stability. It can make the required electroplating process and screen printing various textures, decorations, and optical effects for aesthetics.

PC material

 

PC is a kind of amorphous, odorless, non-toxic. Highly transparent colorless or yellowish thermoplastic engineering plastics. Has excellent physical and mechanical properties.

Especially the excellent impact resistance. High tensile strength, bending strength, compression strength. Creep is small, size stable. Has good heat resistance. And low-temperature resistance. A relatively wide temperature range has stable mechanical properties.

Dimensional stability, electrical properties, and flame retardancy can use for a long time under 60 ~ 120 ℃. No obvious melting point, in 220-230 ℃ in the molten state.

Due to the molecular chain rigidity, resin melt viscosity. Bibulous rate is small, small shrinkage rate, high dimensional accuracy.

Good dimensional stability, membrane permeability is small. Self-extinguishing material. Light is stable. But not resistant to ultraviolet light, good weather ability.

They can withstand oil, acid, alkali resistant, oxidizing acid, and amine, ketone, soluble in chlorinated hydrocarbons. And aromatic solvents, Easy cause hydrolysis and crack in the water for a long time.

The disadvantage is that because of the fatigue strength is poor, prone to stress cracking. The solvent resistance is poor, with poor wear resistance. The product features environmental protection. Flame retardant, impact resistance, high and low-temperature resistance. Good dimensional stability, and good insulation.

Specifications china transparent injection molds making

1. Our clear transparent parts are widely recognized and trusted by users. And can meet continuously developing economic and social needs.

2. A quality hot runner already widely used to reduce cycle times and maintaining the shinning. And clear surfaces during long-time production.

3. We guarantee the mold life and injection mold spare part use /changeable.

4.S7/H13/2344  after heat-treat. The hardness will be up to  52-54 HRC to get longer mold life.NAK80. 718 is also a good choice for transparent clear injection mold making in China.

5. High-quality steel has to be tested and certificated from steel suppliers in accordance with the transparent parts.

injection mold slider design

 

Injection Mold Slider Design: Key Principles & Best Practices

Sliders (also called side-action cores or cam mechanisms) are essential mold components used to form undercuts or complex geometries that cannot be released by standard ejection systems. Here’s a comprehensive guide to slider design for injection molds:

1. When to Use Sliders?

Sliders are needed when:

• The part has external undercuts (e.g., side holes, hooks, threads).
• The part has internal undercuts (e.g., snap fits, internal grooves).
• Straight ejection would damage the part.

2. Slider Types & Mechanisms

Type	Description	Application
Angled Pin Slider	Driven by a tapered pin during mold opening.	Simple side undercuts, low-cost.
Hydraulic Slider	Uses a hydraulic cylinder for controlled movement.	Complex undercuts, high precision.
Rack & Pinion	Gear-driven for smooth linear motion.	Long travel distances.
Lifter-Assisted	Combines a lifter + slider for deep undercuts.	Internal undercuts.

3. Critical Design Parameters

(1) Slider Movement Calculation

• Travel Distance = Undercut Depth + (1~2mm safety margin).
• Angle Pin Angle (typically 15°–25°):
• Larger angle = Faster movement but higher friction.
• Smaller angle = Smoother but slower action.

(2) Guiding & Locking

• Wear Plates (hardened steel) reduce friction.
• Locking Blocks prevent slider deflection during injection.

(3) Cooling Considerations

• Avoid cooling lines near sliding surfaces to prevent warping.
• Use baffles/bubblers if cooling is necessary.

(4) Draft Angles

• Add 1°–3° draft on slider contact surfaces to ease release.

4. Step-by-Step Slider Design Process

1. Identify Undercut Location

• Check part CAD for undercuts requiring side action.

1. Choose Slider Type

• Angled pin for simple designs; hydraulic for complex motions.

1. Calculate Travel & Angle

• Ensure full undercut clearance without interference.

1. Design Slider & Core

• Use split cores if undercut is deep.

1. Add Locking & Ejection

• Locking blocks + return pins for stability.

1. Simulate Motion

• Check for collisions in mold-opening sequence.

5. Common Slider Defects & Solutions

Issue	Cause	Solution
Slider Sticking	Poor lubrication/wear.	Use self-lubricating materials (e.g., bronze guides).
Part Damage	Insufficient travel/draft.	Increase slider stroke or draft angle.
Flash Formation	Worn locking surfaces.	Replace hardened lock blocks.

6. Advanced Tips

• Micro-Sliders: For tiny undercuts (<2mm), use spring-loaded mini-sliders.
• Collapsible Cores: For threaded parts, use retractable cores.
• 3D-Printed Sliders: For prototypes, use metal 3D printing for complex geometries.

Conclusion

A well-designed slider ensures smooth demolding of complex parts while maintaining mold longevity. Prioritize:
✔ Precise travel calculation
✔ Robust locking/guiding
✔ Proper cooling & lubrication

For high-volume production, hydraulic sliders offer better control, while angled pin sliders are cost-effective for simpler molds.

 

injection mold slider

In conclusion, the design of an injection mold slider is a critical factor in the success of any injection molding process. By carefully considering factors such as material choice, shape, mechanism, placement, and maintenance, it is possible to design a slider that functions correctly and produces high-quality parts. With careful planning and attention to detail, it is possible to create injection molds that deliver excellent results time and time again.

As a professional china injection mold company, we focus on precision mold making manufacturing
in china for the complicated slider.

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.

lastic Injection Mold Design: Principles, Components & Gating Systems

 

Understanding Plastic Injection Mold Design: A Comprehensive Guide

For manufacturers and engineers, the plastic injection mold is the most critical tool in the production cycle. While every mold is customized for a specific product, the underlying engineering principles remain constant. A well-designed mold ensures part consistency, reduces cycle times, and extends the lifespan of the tool.

The basic structure of an injection mold consists of three functional groups: the Gating System, Molded Parts, and Structural Components.

1. The Gating System: The Pathway for Success

The gating system is the "plumbing" of the mold. It guides the molten plastic from the injection machine nozzle into the mold cavity.

• The Sprue: The primary entry point. To prevent leakage and "freezing" at the nozzle, the sprue inlet is typically 0.5mm to 1.0mm larger than the machine nozzle. A standard 3° to 5° taper is added for easy ejection.

• Cold Slug Well: A critical "trap" at the end of the sprue that catches the cooler material from the nozzle tip. This prevents cold spots from clogging the gates or creating blemishes on the final part.

• Runners (Shunts): These channels distribute plastic to multiple cavities. Professional molders prefer trapezoidal or circular runners for balanced flow and minimal pressure drop.

• The Gate: The narrowest point in the system. It controls the velocity of the melt and acts as a "seal" once the part is full, preventing backflow.

2. Cavity and Core: The Heart of the Shape

The Molded Parts are what define the final geometry and surface texture of your product.

• Cavity (Female): Forms the exterior surface.

• Core (Male): Forms the interior features (like holes or ribs).

• Precision Finish: To ensure easy "stripping" or ejection, the surface roughness is usually kept at Ra < 0.32µm. For high-gloss or transparent parts, vacuum heat treatment and mirror polishing are applied to the tool steel.

3. Venting and Cooling: Ensuring Part Quality

Even the best gating system will fail without proper venting and thermal management.

• Venting (Air Escapes): As plastic fills the mold, air must escape. Without proper vent slots (usually 0.03mm to 0.05mm deep), the air compresses, causing "burn marks" or "short shots."

• Cooling Systems: Efficiency is key. Most Chinese injection mold companies utilize internal water channels to regulate temperature. Uniform cooling is the secret to preventing part warpage and achieving fast cycle times.

4. Structural Components: The Backbone

The structural parts, such as guide pillars, ejector pins, and stripper plates, do not form the plastic but are essential for the mold's mechanical operation. They ensure the mold opens and closes with micron-level alignment every single time.

Why Choose a Professional China Injection Mold Company?

Partnering with an experienced manufacturer ensures that these technical principles are applied correctly. From choosing the right tool steel (like P20 or S136) to optimizing the gate location, professional mold design minimizes long-term production costs and ensures high-yield manufacturing.