Shanghai Daoqin Plastics Co., Ltd.

 一, POM features

资 material 图（ 源于广东诚塑材 material 官网）

二, good POM raw materials injection molding need attention/notes that 几点?

▲1, plastics raw materials 处理

POM plastics raw materials 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 plastics raw materials material remove requirements screw material outer, for injection molding machine has especially requirements, generally injection molding can.

▲3, injection molding mold and gate design

Common injection molding 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′-130′ between.

排 gas system

POM-H thick degree 0.01-0.02mm wide 3mm

POM-K thick degree 0.04mm wide 3mm

▼4, 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

越 low good, generally ultra- 200bar

▲7, time

如 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 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

清理 machine must use PE or PP, electrical hot, screw in front 位. material and screw must maintain 清洁.

杂质 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 " target="_blank">颜 material, lubricant or

含GF nylon material material, 会导致 plastics drop 质.

▲9, rear 处理

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.