Precision Injection Molding

What is Precision Injection Molding?

Precision Injection Molding is an advanced manufacturing process that produces plastic parts with extremely tight tolerances (typically within ±0.01mm), superior surface finish, and consistent performance.

Key Objective: Meet stringent requirements for dimensional accuracy, functional reliability, and aesthetic consistency.

Typical Applications

Medical: Surgical tools, microfluidic chips.
Electronics: Connectors, sensor housings.
Automotive: Fuel system components, optical lenses.
Consumer Electronics: Micro gears, precision structural parts.

Precision Injection Molding Process

Step	Key Control Parameters
1. Material Pre-Treatment	Strict drying (humidity ≤0.02%) to prevent bubbles/hydrolysis.
2. Melting & Injection	Precise melt temp (±1°C), multi-stage injection speed control.
3. Packing & Cooling	Optimized pressure/time to minimize shrinkage; mold temp control (±0.5°C).
4. Ejection & Post-Processing	Non-marking ejection; annealing/CNC machining if needed.
5. Inspection & Packaging	100% critical dimension checks (CMM), anti-static packaging.

Key Advantages

Ultra-High Accuracy: Achieves micron-level tolerances for critical assemblies.
Exceptional Repeatability: Cpk≥1.67, ideal for high-volume consistency.
Complex Geometry: Enables thin walls (0.1mm), micro-features, multi-material parts.
Material Integrity: Low residual stress, no flash, ensuring strength and durability.

Precision vs Conventional Injection Molding

Criteria	Precision Injection Molding	Conventional Injection Molding
Tolerance	±0.005–0.02mm	±0.1–0.5mm
Mold Precision	Mirror polish, hardness ≥HRC52	Standard polish, HRC48-50
Machine Type	Electric/hybrid presses, closed-loop control	Hydraulic presses, open-loop control
Material Choice	Low-shrink engineering plastics (LCP, PEEK)	Commodity plastics (PP, ABS)
Cost	High (tooling/machine/inspection costs)	Low
Applications	Medical, optics, microelectronics	Consumer goods, packaging

Precision Injection Products