Shanghai Daoqin Plastics Co., Ltd.

reduce products internal stress is heat resistant ABS injection molding key/critical. from mold design, material drying, molding temperature degree, holding pressure pressure and time, mold temperature degree and other 5 large 方面, separation 享 笔者 for heat resistant ABS resin molding processing key points.

普通ABS resistant thermal properties good, in, through add ɑ-甲基 styrene copolymer and N-苯基马 酰亚 amine copolymer and other heat resistant agent development series heat resistant ABS resin, heat deflection temperature (HDT) (HDT) is 90-120℃.
due to heat resistant ABS separation structure in has high rigidity ring and N-苯基基团, improve/increase heat resistant property meanwhile, increase separation 子链 空间位 retardant 效应, make separation 子链 松弛 speed degree reduce, easy make products in relatively large internal stress, products force cracking, force 发白, product and other defect. therefore, reduce products internal stress is heat resistant ABS injection molding key/critical.

product mold design  

product thick requirements 均一, ABS product thick 差异应 control in 25%以 inner, anti thick large local force in. strong/high degree relatively low 柱子根部需 increase R角 or add add strong/high 筋, anti 止柱子 fracture.

卡扣 design, 卡扣 根部 need 倒R角, R角 large small 取决于 product thick, R角 and thick ratio in 0.3 above, ratio value increase large, internal stress decrease small, need product surface sink marks issues. mold cooling water design need ensure cooling uniform property, cooling 不均, shrinkage 不一而造 formed internal stress.

材 material drying  

usually, heat resistant ABS resin in 储存运输 process in absorption gas in water separation, water absorption gas wet degree has 变化, generally in 0.2~0.4% between, therefore must for material 进行充 separation drying, make material moisture content drop 至0.05% below/following, most good in 0.02% below/following, can can water 花, silver streaks and other surface defect phenomenon. heat resistant ABS resin drying temperature degree ratio 普通ABS high, usually is 80-95℃, drying time 3-4 small 时.

molding temperature degree  

molding temperature degree is heat resistant ABS processing especially 关注 一 parameters, its setting is ensure heat resistant ABS充 separation is 基准, amount use supply 商建议 molding temperature degree in value upper temperature degree 区域, molding temperature degree improve/increase obvious reduce heat resistant ABS viscosity, increase resin flow property, make flow 距离变 long, ensure material has filling can force.

holding pressure pressure and time  

for/regarding heat resistant ABS 说, holding pressure pressure and time setting is combined 理, effect/influence made parts internal stress large small. holding pressure pressure increase make separation 子间隙变 small, active scope/range decrease small, melt shrink small, density large, separation between function force increase, can improvement product sink marks and internal quality, 但会导致 internal stress large, therefore, in ensure product appearance quality front lower amount selection relatively low holding pressure pressure.
holding pressure time setting is according to gate cooling formed its solid 化, screw again already again for molding product add pressure is time. holding pressure time long, easy make material filling separation, separation 子间隙变 small, internal stress large; holding pressure time short, product easy generate sink marks, dimensions unstable. holding pressure time setting products weight again 变化时 most short time is most holding pressure time.

mold temperature degree  

in molding heat resistant ABS时 use mold temperature machine control mold temperature degree, mold temperature is 60-80℃. relatively high mold temperature degree, 往往会 generate good flow, relatively high weld lines strong/high degree, relatively small product internal stress, molding cycle 会适当延 long.
若 mold temperature degree ratio low, 就会导致 products internal stress high, reduce products property can, can can products 脆裂, filament cracking or cracking and other defect phenomenon.