Shanghai Daoqin Plastics Co., Ltd.

PP通称 polypropylene (PP), its resistant property can good, 也称"百折胶". PP is types semi transparent, semi thermoplastic property plastics , in high strength, insulation property good, water absorption low, hot temperature degree high, density small, crystallization degree high grade features. modified filling material is has glass fiber, material filler, thermoplastic property and other.
separation use PP its property separation relatively large, as PP勾当 speed degree 介于ABS and PC between.
1, plastics 措置.
pure PP is semi transparent white, can formed type color color. PP color in injection molding machine upper can use masterbatch material. in 华丽达 machine upper has add strong/high mixing/compounding 浸染 自 force 塑化元 parts, can use color powder color. outer as products, as UV不变 agent and carbon filling. recycled material as ratio/proportion need ultra- 出15%, 否则会激发 strong/high degree drop and separation color. PP injection molding processing front 别不需出格 drying 措置.
2, injection molding machine selection
for injection molding machine selection has 不凡请求. due to PP存 in high crystallization property. using/adopting injection pressure relatively high and can more made electrical injection molding machine. clamping force 别按3800t/m2 必定, injection amount 20%-85%便 can.
3, mold and gate design
mold temperature degree 50-90℃, for/regarding dimensions relatively high use high mold temperature. type temperature degree ratio type temperature degree low 5℃ above, runner 直径4-7mm, gate long degree 1-1.5mm, can small 至0.7mm. gate long degree short good, is 0.7mm, deep degree is thick semi, wide degree is thick 两倍, mold cavity inner long degree growth. mold must has 精采 排 gas property, gas deep 0.025mm-0.038mm, thick 1.5mm, need anti shrink short 痕, need use large 而圆 注口 and runner, add strong/high thick degree need small （例如 is thick 50-60%）. homopolymer PP made as material, thick degree can ultra- 出3mm, 否则会 has bubbles （ thick products can use copolymer PP）.
4, temperature degree
PP melting point is 160-175℃, separation temperature degree is 350℃, in injection processing temperature degree setting can ultra- 出275℃. melt temperature degree most good in 240℃.
5, injection speed degree
is decrease internal stress and deformation, selection high speed injection, has and other PP and mold separation use （人 幔现 bubbles, gas marks ）. has 花纹 概况闪现由 gate separation 别 明 dark versus strip/profile 纹, need use low speed injection and relatively high mold temperature.
6, back pressure
can use 5bar熔胶 back pressure, color powder material back pressure can 适当调 high.
7, injection and holding pressure
using/adopting relatively high injection pressure （1500-1800bar） and holding pressure pressure （约 is injection pressure 80%）. in full 行程 95%时转 holding pressure, use relatively long holding pressure 时刻.
8, products rear 措置
is anti rear crystallization generate shrink short deformation, products 别需经 hot water 浸泡措置.

resistant impact GF/M50%PPS(polyphenylene sulfide (PPS))6150T6 Polyplastics