Micro Injection Molding (Micro Molding Service)

Micro injection molding is a highly specialized plastic manufacturing process designed for ultra-small and ultra-precise components, typically in the milligram weight range. It enables the production of extremely fine structures that traditional injection molding cannot achieve. This technology is widely used in industries requiring miniaturization, high precision, and complex micro-scale geometries, such as medical devices, […]

Product Description

Micro injection molding is a highly specialized plastic manufacturing process designed for ultra-small and ultra-precise components, typically in the milligram weight range. It enables the production of extremely fine structures that traditional injection molding cannot achieve.

This technology is widely used in industries requiring miniaturization, high precision, and complex micro-scale geometries, such as medical devices, electronics, and precision engineering.

Key Features

Ultra-small component manufacturing (mg-level parts)
High-speed and high-pressure injection capability
High-precision micro mold technology
Excellent repeatability for mass production
Capable of complex micro geometries
Minimal material waste
Stable dimensional control at micro scale

Manufacturing Process

Micro-scale mold is designed with ultra-high precision
Specialized micro-dosing system prepares material
High-speed injection fills micro cavities instantly
Rapid cooling ensures dimensional stability
Automated ejection under microscopic tolerance control
Strict inspection under precision measurement systems

This process requires extremely precise control of pressure, temperature, and injection timing.

Suitable Materials

Micro injection molding supports high-performance engineering polymers:

PEEK (high-performance medical & industrial grade)
LCP (Liquid Crystal Polymer for micro electronics)
PA (Nylon)
PC (Polycarbonate)
POM (Acetal / Delrin)
PMMA (Acrylic, micro optical applications)
TPU (flexible micro parts)

Material selection depends on flowability, stability, and micro-forming capability.

Applications

Micro injection molding is widely used in advanced precision industries:

Medical micro components (catheters, micro valves, connectors)
Micro gears and micro mechanical systems
Electronic micro connectors and terminals
Optical micro parts and alignment structures
Sensor micro housings
Wearable device components

Cost Optimization & Efficiency

Although micro molding requires advanced tooling and equipment, it provides significant long-term value:

Enables mass production of ultra-small parts
Reduces assembly of multiple components
Improves product reliability at micro scale
Minimizes scrap through high repeatability
Supports automation for large-scale production
Reduces post-processing requirements

Why Choose Us

We provide advanced micro injection molding solutions with precision engineering capability:

Ultra-high precision micro mold manufacturing
Stable micro-injection process control
Experience in medical and electronic micro components
Advanced inspection and measurement systems
Support for complex micro-geometry design
High-volume production stability
Fast prototyping and engineering support

We help customers achieve reliable micro-scale plastic components with consistent quality and tight tolerances.

FAQ: Micro Injection Molding (Micro Molding Service)

What is the minimum part size achievable with micro injection molding?

We produce parts weighing as little as 0.1 grams with feature sizes in the 0.1–0.5 mm range. The practical limit depends on the material's melt flow behavior, the mold cavity precision, and whether the part can be handled and inspected reliably after molding.

How do you fill extremely small cavities without short shots or flash?

Micro molding requires tight process control over injection speed, melt temperature, and cavity pressure. We use precision injection units with small screw diameters and servo-controlled injection to achieve consistent fill in complex micro cavities.

What inspection methods are used for micro molded parts?

Optical measurement systems, vision inspection, and non-contact 3D scanning are standard tools. Manual contact measurement can introduce errors at this scale. We define key inspection features during DFM and use statistical sampling appropriate to the volume and application risk.

Which applications require micro injection molding?

Hearing aid components, implantable medical devices, optical connectors, microfluidic chips, watch components, and miniature electronic housings are common. The defining characteristic is that part dimensions or feature tolerances cannot be achieved with standard injection molding equipment.

Are micro molded parts as structurally reliable as conventionally molded parts?

Yes, provided the material and design are correctly matched. Resin selection is particularly important at micro scale because fiber reinforcement may not improve strength in very thin sections. We evaluate structural requirements and recommend validated material options.

Technical Parameters

Item	Specification
Process Type	Micro Injection Molding
Part Weight Range	0.001 g – 1 g (mg-level components)
Tolerance Range	±0.003 – ±0.01 mm
Injection System	High-speed micro-dosing system
Mold Accuracy	Ultra-precision CNC / EDM machining
Injection Pressure	100 – 300 MPa
Cycle Time	5 – 60 seconds
Material Compatibility	PEEK, LCP, PC, POM, PA, PMMA, TPU
Feature Size Capability	Micro-scale structures (<100 μm possible depending on design)
Production Volume	Prototype to high-volume production