Detailed Introduction

This medical & industrial multi-cavity injection mold is customized for single-piece PFA straight union connectors used for straight pipeline connection, fully optimized for PFA’s high melt viscosity, outstanding chemical inertness and high transparency to solve typical PFA molding defects such as axial weld lines, thread shrinkage and transparent surface haze.

The split fixed-moving two-plate mold adopts symmetrical multi-row cavity layout to realize high-efficiency mass production of straight transparent PFA union connectors shown in the picture. Each double-end threaded connector cavity is an independent embedded insert for quick disassembly, replacement and deep residue cleaning. All molding surfaces adopt multi-stage high-gloss polishing matched with PFA high-temperature melting characteristics, which greatly reduces surface flow streaks and internal fluid dead corners, eliminating post-molding secondary deburring and polishing processes.

Independent distributed cooling pipelines are arranged for each cavity to precisely control mold temperature during continuous high-temperature PFA injection molding, effectively restraining uneven wall shrinkage and thin transparent joint deformation. Built-in precision interlock slide locking blocks maintain stable clamping force under long-cycle high-temperature mass production, avoid flash on fine thread and thin-wall connecting ends, and extend mold service life under cyclic fluoropolymer high-temperature molding.

Complete Precision Machining Workflow

1. 5-axis CNC rough milling for mold base outline and straight tubular connector 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 double-end threaded port and thin transparent wall contours
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 straight union 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 symmetrical multi-cavity layout greatly improves molding efficiency while unifying thread sealing accuracy, optical transparency and interchangeable dimensional consistency of PFA straight pipeline connectors.

Specification Table