Detailed Introduction

This multi-cavity liquid silicone injection mold is customized for miniature integrated flow limiting pins used in laboratory diagnostic fluid circuits, fully optimized for LSR’s soft elasticity, low particle shedding and medical biocompatibility to eliminate typical LSR molding defects including multi-thin rib shrinkage, central shaft warpage and surface weld lines.

The split fixed-moving two-plate mold adopts symmetrical multi-row single-part cavity layout to mass produce three identical flow restrictor pins shown in the image, each integrated with two end positioning mandrels and middle multi-layer limiting ribs as one monolithic silicone component. Every micro multi-rib thin-wall pin cavity is an independent embedded insert for quick disassembly, size replacement and residue-free deep cleaning. All molding surfaces undergo multi-stage particle-free high-gloss polishing matched with LSR high-temperature vulcanization characteristics, removing micro burrs and sharp edges that may shed particles and contaminate lab test reagents, no secondary post-molding trimming required.

Independent distributed cooling pipelines are laid around the full length of the pin cavity to precisely stabilize mold temperature during continuous LSR curing molding, effectively restraining thin rib bending and central long mandrel axial deformation. Built-in precision interlock slide locking blocks maintain stable clamping force under long-cycle Class 100 cleanroom mass production, preventing micro flash on thin rib and mandrel transition surfaces, and extending mold service life under cyclic liquid silicone molding.

Complete Precision Machining Workflow

1. 5-axis CNC rough milling for mold base outline and slender multi-rib flow pin cavity rough forming
2. Vacuum stress relief heat treatment to stabilize steel hardness and reduce thermal deformation under long-run high-temperature LSR curing
3. Precision surface grinding to control mold plate flatness & parallelism within ±0.002mm
4. Sinker EDM & Wire Cut WEDM for ultra-fine long mandrel, multi-layer thin rib and end positioning boss contour features
5. Multi-stage high-temperature resistant particle-free high-gloss polishing optimized for medical LSR melt fluidity
6. Optional ultra-clean anti-corrosion surface coating compatible with diagnostic laboratory grade biocompatible LSR raw materials

All mold core, cavity and structural components complete full 3D coordinate measuring inspection to satisfy strict in-vitro diagnostic laboratory equipment drawing tolerance standards. Full customization is supported based on LSR flow restrictor pin samples or engineering drawings: cavity quantity, mold steel grade, cooling circuit layout and polishing grade can be adjusted according to medical LSR purity grade, biosafety cleanroom requirements and daily production capacity. The symmetrical multi-cavity layout greatly improves molding efficiency while unifying rib dimensional consistency, shaft straightness and particle-free surface performance of miniature diagnostic fluid flow limiting silicone pins.

Specification Table