Shanghai Daoqin Plastics Co., Ltd.

PC通称 polycarbonate (PC), due to its excellent mechanical properties, anti elastic 胶. PC tool has machine strong/high degree high, use temperature degree scope/range 广, electrical insulation property can good （但 anti electrical property can 不变）, dimensional stability good, transparent and other features. in electrical product, electrical outer housing/shell, electronics product structural parts upper by use. PC modified product relatively more, usually has add glass fiber, material filler, chemical flame retardant, its it plastics and other. PC flow property relatively 差, processing temperature degree relatively high, therefore its many grade modified material processing need 专门 塑化 injection structure. 1, plastics 处理PC water absorption relatively large, processing front need preheating drying, pure PC drying 120℃, modified PC generally use 110℃ temperature degree drying 4 small above. drying time can ultra- 10 small 时. generally can use for extrusion method drying is 否足够. recycled material use ratio/proportion can 达20%. in certain lower, can 100% use recycled material, 实际份 amount need products quality requirements 而定. recycled material can meanwhile mixed combined different color masterbatch, 否则会严 heavy loss bad formed product property 质. 2, injection molding parts machine selection in PC products due to cost and its it causes, more use modified material, especially is electrical product, also must increase anti property can, in flame retardant PC and its it plastics alloy product molding 时, for injection molding parts machine system requirements is mixed combined good, corrosion resistant, 常规 塑化 screw difficult to, in 选购时, need 预先说明. 华美达 company has specialized PC screw 供客户 selection. 3, injection molding parts mold and gate design Common injection molding parts mold temperature degree is 80-100℃, add glass fiber (GF) is 100-130℃, small type products can use gate, gate deep degree has most thick 部位 70%, its it gate has ring and long 方形. gate large good, decrease low plastics by degree 剪切而造 formed defect. gas deep degree small 于0.03-0.06mm, runner amount short 而圆. demolding degree generally is 30′-1° left right. 4, temperature degree can use for injection method processing temperature degree high low. generally PC processing temperature degree is 270-320℃, has modified or low molecular weight PC is 230-270℃. 5, injection speed degree more use fast injection speed degree molding, electrical appliances parts. Common is slow speed → fast speed molding. 6, back pressure 10bar left right back pressure, in has gas marks and mixed color lower can reduce. 7, time in high temperature lower time long, material material drop 质, 放也CO2, formed color. use LDPE, POM, ABS or PA清理 machine 筒. application PS清理. 8, precautions has modified PC, due to recycling 次数太 more （ molecular weight reduce ） or various formed separation mixing/compounding 不均, easy generate deep color liquid 体泡.