Detailed Introduction

This multi-cavity injection mold is tailor-made for complete sets of PFA T-shaped fluid control fittings and supporting sealing accessories, fully optimized for PFA’s high melt viscosity, outstanding chemical inertness and high-purity property to eliminate typical PFA molding defects such as thread shrinkage, weld lines and transparent part haze.

The split fixed-moving two-plate mold adopts symmetrical multi-row interchangeable cavity layout to realize simultaneous mass production of all parts displayed in the image: T-type three-way fluid control main fitting, multi-spec threaded locking caps, hexagonal positioning nuts, thin sealing gaskets and tapered flow spout assemblies. Each complex multi-threaded component cavity is an independent embedded insert for quick disassembly, replacement and deep residue-free cleaning. All molding contact surfaces undergo multi-stage high-gloss polishing matched with PFA high-temperature melting state, which removes micro burrs and internal fluid dead corners, eliminating post-molding secondary deburring and polishing processes.

Independent distributed cooling pipelines are arranged for every single cavity to precisely stabilize mold temperature during continuous high-temperature PFA injection molding, effectively restraining thread section uneven shrinkage, thin sealing ring deformation and tapered spout dimensional deviation. Built-in precision interlock slide locking blocks maintain stable clamping force under long-cycle high-temperature 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 multi-threaded pipeline 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, thin sealing ring and tapered spout contour features
5. Multi-stage high-temperature resistant high-gloss polishing optimized for PFA melt fluidity
6. Optional anti-corrosion surface coating compatible with high-purity semiconductor & biopharmaceutical PFA raw materials

All mold core, cavity and structural components complete full 3D coordinate measuring inspection to satisfy strict ultra-clean fluid pipeline equipment drawing tolerance standards. Full customization is supported based on PFA 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 thread sealing accuracy, pipeline smoothness and interchangeable dimensional consistency of PFA T-type fluid control fitting assemblies.

Specification Table