Detailed Introduction

This multi-cavity injection mold is professionally customized for full set PFA filter end caps and matched fluid control fittings, fully adjusted for PFA’s high melt viscosity, excellent chemical inertness and high-purity property to eliminate typical PFA molding defects such as curved cap wall uneven shrinkage, thread weld lines and transparent surface haze.

The split fixed-moving two-plate mold adopts modular symmetrical multi-row interchangeable cavity layout to realize simultaneous mass production of all parts shown in the image: large dual-port filter end cap, flat sealing end cap, 90° elbow connector, multi-spec threaded locking sleeves, small micro nozzles and plastic retaining ring accessories. Each irregular curved and multi-threaded component cavity is an independent embedded insert for quick disassembly, replacement and deep residue-free cleaning. All molding surfaces adopt multi-stage high-temperature resistant high-gloss polishing matched with PFA melting characteristics, removing micro burrs and internal fluid dead corners without secondary post-molding trimming.

Independent distributed cooling pipelines are laid out for every single cavity to precisely stabilize mold temperature during continuous high-temperature PFA injection molding, effectively restraining thin cap wall warpage, threaded port deformation and micro nozzle dimensional deviation. Built-in precision interlock slide locking blocks maintain stable clamping force under long-cycle high-temperature cleanroom mass production, preventing flash on fine thread and thin sealing edge structures, and extending mold service life under cyclic fluoropolymer high-temperature processing.

Complete Precision Machining Workflow

1. 5-axis CNC rough milling for mold base outline and complex curved end cap & multi-thread fitting cavity rough forming
2. Vacuum stress relief heat treatment to stabilize steel hardness and reduce thermal deformation under long-run high-temperature PFA molding
3. Precision surface grinding to control mold plate flatness & parallelism within ±0.002mm
4. Sinker EDM & Wire Cut WEDM for ultra-fine threaded port, curved thin cap wall and small micro nozzle contours
5. Multi-stage high-gloss polishing optimized for PFA high melt viscosity to boost transparency
6. Optional anti-corrosion surface coating compatible with high-purity semiconductor and biopharmaceutical PFA raw materials

All mold core, cavity and structural components complete full 3D coordinate measuring inspection to satisfy strict high-purity fluid filtration equipment drawing tolerance standards. Full customization is supported based on PFA filter fitting samples or engineering drawings: cavity quantity, mold steel grade, cooling circuit layout and polishing grade can be adjusted according to PFA purity grade, corrosive fluid resistance requirements and daily production capacity. The modular multi-cavity layout greatly improves molding efficiency while unifying sealing flatness, fluid channel smoothness and chemical inertness of complete PFA filter supporting assemblies.

Specification Table