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. in material 理, machine and chemical property can, is has resistant scratch property can.   
    POM crystallization property plastics, melting point relatively, 一旦达 to melting point, melt viscosity active drop 落. temperature degree ultra- 出必定限 degree or melt hot 时刻太 long, 会激发 separation 化.   
    copper is POM degradation catalytic agent, and POM melt 接触 部位应 anti as copper or copper material.   
    1, plastics 措置  
    POM吸 water property small, is is 0.2%-0.5%. in is lower, POM不需 drying can processing, for wet raw materials must drying. drying temperature degree 80℃ above, 时刻2 small above, specific 应按供 to material 进行.   
    recycled material as ratio/proportion ultra- 出20-30%. need material types type and lower use 处而定, has can 达100%.   
    2, machine selection   
    POM remove screw material outer, for injection molding machine has 出格请求, injection molding can.   
    3, mold and gate design   
    Common mold temperature degree made is 80-90℃, runner has 3-6mm, gate long degree is 0.5mm, gate fine need 视胶壁 thick degree 而定, gate most less products thick degree 0.5-0.6倍, long gate wide degree is is thick degree 2倍 or above, deep degree is thick 0.6倍, demolding degree 40′-130′ between.   
    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   
    low good, ultra- 出200bar  
    7, 滞留时刻  
    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 化  
    in injection molding temperature degree lower melt can in machine inner ultra- 出20 separation 钟. POM-K in 240℃ lower can 滞留7 separation 钟. is 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 dry 净. or 污垢会转变POM plastics raw materials hot property （出格 is POM-H）. therefore use 完含卤 polymer or other acid property polymer rear, as PE清算 dry rear dry 打POM material, 否则会 generate 爆炸. 若浸染不妥 颜 material " target="_blank">颜 material, light slip agent or 含GF nylon material material, 会导致 plastics drop 质.   
    9, rear 措置  
    for/regarding very is temperature as made parts quality relatively high, must hot 措置.  
 
    退火措置 lower 场, can will products concentrated degree is 30% salt acid solvent liquid in 浸30 separation 钟搜检, rear use 肉眼视察剖断 is is has 残存应 force cracks generate.