Shanghai Daoqin Plastics Co., Ltd.

UPVC also hard PVC, it is chlorine ethylene mono polymerization reaction made formed 无定形 thermoplastic property resin add additives （如 stabilizer, lubricant, filling agent and other ）组 formed. remove use additives outer, also using/adopting and its it resin blending modified method, make its tool has obvious use value. this resin has CPVC, PE, ABS, EVA, MBS and other. UPVC melt viscosity high, flow property 差, make improve/increase injection pressure and melt temperature degree, flow property 变化也不 large. another, resin molding temperature degree and hot separation understanding temperature degree very 接近, can 够进行 molding temperature degree scope/range very narrow, is types difficult molding material. 1, plastics 处理 处于 room temperature 24 small rear, water amount less 于0.02%, therefore must dry. must drying, can 放入60-70℃ hot gas 炉3 small 时, or 80℃ drying machine 1-1.5 small 时. recycling material most more can use 20% and new material mixed combined, recycling material use amount need products most applications 而定. use recycling material can make injection molding parts 失败, mono is recycling formed separation more, more more causes is due to material material more again processing. recycling material more recycling one-time quality decline more. 2, injection molding parts machine selection UPVC due to melt viscosity large, easy separation understanding, separation understanding material for iron has function, its injection molding parts molding must specialized 塑化部 parts and temperature system. 华美达 in product cover/cap types clamping force Model/Grade, has UPVC塑化 injection system, combined UPVC pipe fittings product requirements has specialized safety plant/unit. generally lower need injection amount can meet/satisfy weight requirements, selection this series UPVC specialized injection molding parts plant/unit can molding high quality product. 3, mold and gate design mold temperature degree can is 40℃. runner long degree need short, 直径则 need large, decrease small pressure loss and holding pressure can to mold cavity. gate short good, 模切面 need 圆形, 射嘴口 直径 most small 6mm,, formed 圆锥形, inner formed 5°. runner 模切面也 need 圆形, and cold material combined formed, through semi 径连接主 runner and gate, can is 7mm. gate application 切圆面形 semi 径连接塑 parts, short good, 模切面 need slip. cold material can anti semi solid material material mold cavity, it important property by 忽略. gate need positive 确, make material material in runner upper flow, 不会停留 in 尖角, sheet/slice and metal 痕迹里, 以免出现 pressure shrink or decrease pressure 情况, maintain runner slip 流畅. mold application 不锈钢铸造, content less 13%, most good 16%, hardness less has 55, hard mold can 经镀铬处理, formed function. production rear, application temperature and alkali liquid small will 模面清洗 dry rear again upper 油质喷雾 or silicon 质喷雾. 4, temperature degree can use method degree amount, 由185-205℃不 and other. from injection shot material material light slip degree can 知UPVC 准确熔胶 temperature degree. material material in injection shot rear coarse 糙不平, 就证明 material material non 均一（塑化不足）, table/sheet 示 定 temperature degree low; injection shot rear foam 并冒出 a large amount of 烟雾, table/sheet temperature degree high. 5, injection speed degree speed need slow, separation 剪切会 make material material drop 质, utilizing UPVC production degree light slip thick products 时, using/adopting more grade injection molding parts mold filling speed degree. 6, screw speed clamping cycle 而定. screw speed degree ultra- 0.15-0.2m/s7, back pressure can 达150bar, low good, Common is 5bar. 8, time in 200℃ temperature degree lower, machine 筒滞留 time most more can ultra- 5 separation 钟. temperature degree is 210℃, machine 筒滞留 time can ultra- 3 separation 钟.