Shanghai Daoqin Plastics Co., Ltd.

POM（ also 称赛钢, 特灵）. it is aldehyde and other is raw materials polymerization. POM-H（ polyoxymethylene (POM) homopolymer ）, POM-K（ polyoxymethylene (POM) copolymer ） is high density, high crystallization degree thermoplastic property engineering plastics. tool has good material 理, machine and chemical property can, especially is has excellent resistant scratch property can. POM crystallization property plastics, melting point obvious, 一旦达 to melting point, melt viscosity speed decline. temperature degree ultra- 一定限 degree or melt hot time long, 会引起 separation understanding. copper is POM degradation catalytic agent, and POM melt 接触 部位应避免 use copper or copper material. 1, plastics 处理POM吸 water property small, generally is 0.2%-0.5%. in usually lower, POM不需 drying can processing, for wet raw materials must drying. drying temperature degree 80℃ above, time 2 small above, specific supply material 进行. recycled material use ratio/proportion generally ultra- 20-30%. need product types type and most applications 而定, has can 达100%. 2, machine selection POM remove requirements screw material outer, for injection molding parts machine has especially requirements, generally injection molding parts can. 3, injection molding parts mold and gate design Common injection molding parts mold temperature degree control is 80-90℃, runner has 3-6mm, gate long degree is 0.5mm, gate large small need 视胶壁 thick degree 而定, gate 直径至 less products thick degree 0.5-0.6倍, long gate wide degree usually is thick degree 2倍 or above, deep degree is thick 0.6倍, demolding degree 40′-1°30′ between. gas system POM-H thick degree 0.01-0.02mm wide 3mmPOM-K thick degree 0.04mm wide 3mm4, temperature degree can use method amount degree POM-H can is 215℃ （190℃-230℃）POM-K can is 205℃ （190℃-210℃）5, injection speed degree Common is in speed fast, slow easy generate 波纹, fast easy generate and hot. 6, back pressure low good, generally ultra- 200bar7, time equipment has 熔胶滞留点 POM-H can in 215℃滞留35 separation 钟POM-K can in 205℃滞留20 separation 钟不会 has heavy separation understanding in injection molding parts temperature degree lower melt can in machine inner ultra- 20 separation 钟. POM-K in 240℃ lower can 滞留7 separation 钟. if machine, machine temperature degree can drop to 150℃, need long machine must machine 筒子, add hot device. 8, machine machine must use PE or PP, electrical hot, screw in front 位. material and screw must maintain 清洁. or 污垢会改变POM heat stabilized property （ especially is POM-H）. therefore use 完含卤 polymer or other acid property polymer rear, application PE清理 dry rear can 打POM material, 否则会发生爆炸. function 不当 颜 material, lubricant or 含GF nylon material material, 会导致 plastics drop 质. 9, rear for/regarding non normal temperature use made parts quality requirements relatively high, must hot 处理. 退火处理效果, can will products concentrated degree is 30% salt acid solvent liquid in 浸30 separation 钟检查, rear use 肉眼观察判断 is has residual stress cracks generate. POM rear process methods temperature degree time gas 浴退火140-150℃壁 thick increase 5mm即 increase 40-60 separation 钟油浴退火140-150℃壁 thick increase 5mm即 increase 20-30 separation 钟