Shanghai Daoqin Plastics Co., Ltd.

in light production in, 经常会出现一 injection molding defect sheet/slice, long through more year 积累, summary below/following defect defect:

injection molding 不满, 凹陷, combined 缝, material 流纹, gloss good, gas 孔, black spots, 溢边, warpage deformation, 银文, demolding good, color, coarse 糙, 马蹄形, in small, in large, sheet/slice thick, sheet/slice thin, di large, di small, sheet/slice 破裂, runner fracture, toward strip/profile 纹, sheet/slice 沟纹, light ring, and other

above defect formed 因: mold temperature degree, 冲孔刀, runner temperature degree, injection speed degree, injection pressure, holding pressure force, holding pressure time, 转换点, clamping force, cooling time, temperature degree, time, speed degree, back pressure and other

plastics products defect and generate causes methods

■ 因 water separation in generate bubbles

causes: material drying degree 不够而引起 resin hydrolysis.

处理 methods: separation 进行预 drying attention/notes material 斗 保 temperature tube/pipe 理

■ true 空泡

causes: thick material fast speed 冻结, shrinkage to retardant 止, 充模不足因而 generate internal true 空泡. mold temperature degree combined 适. material temperature degree combined 适. injection molding pressure and holding pressure 不足.

处理 methods design non-uniform thick structure. positive gate make material 垂直注入 thick 壁部. improve/increase mold temperature degree. reduce material temperature degree. increase injection molding pressure and holding pressure pressure.

■ 熔 combined 痕

causes: material temperature degree combined 适. injection molding pressure combined 适. mold temperature degree as 乱. inner 未设排 gas 孔.

处理 methods: improve/increase material temperature degree. increase large injection molding pressure. improve/increase mold temperature degree. 设置排 gas 孔.

■ 凹痕

causes: cooling speed degree relatively slow thick inner table/sheet shrinkage generate 凹痕（壁 thick design combined 理）. injection molding pressure 不够. injection molding amount 不够. mold temperature degree high or injection molding rear cooling 不够. holding pressure 不足. gate dimensions combined 理. 避免壁 thick non-uniform.

处理 methods: improve/increase injection molding pressure. increase large injection molding amount. mold temperature degree combined 理则需 add long cooling time. long holding pressure time. large gate dimensions, especially is its thick degree.

■ 糊斑（ full or separation color ）

causes: material temperature degree setting combined 理. material inner local material phenomenon. resin material and 注口 结 combined inner （ long material ）. has 倒流阀 or ring. drying 不够而引起 hydrolysis. injection molding machine amount large.

处理 methods: reduce material temperature degree. 避免死角 structure. method remove combined 部 缝隙. use 倒流阀 and ring. 按规定 conditions 进行预 drying. selection 适当容 amount injection molding machine.

■ 银纹

causes: material temperature degree combined 适. material time long. injection molding speed degree combined 适. gate dimensions combined 理. material drying degree 不够. injection molding pressure combined 适.

处理 methods: reduce material temperature degree. remove material phenomenon. reduce injection molding speed degree. large gate dimensions. 按规定 conditions 进行预 drying. reduce injection molding pressure.

■ gate 处呈现波纹（不 transparent ）

causes: injection molding speed degree combined 适. holding pressure time combined 适. mold temperature degree combined 理. gate dimensions combined 理.

处理 methods: improve/increase injection molding speed degree. shrink short holding pressure time, make rear again has material 注入. improve/increase mold temperature degree. large gate dimensions.

■ 漩纹 and flow marks

causes: mold temperature degree combined 适. injection molding pressure combined 适. gate dimensions combined 理.

处理 methods: improve/increase mold temperature degree. reduce injection molding pressure. expand large gate dimensions.

■ ejection fault/failure （ demolding fault/failure ）

causes: or 模槽 斜 degree 不够. ring time combined 适. material temperature degree combined 适. 顶杆 位置 or amount combined 理. and formed product formed true 空状态. mold temperature degree combined 适. injection molding pressure high, material amount large.

处理 methods: ensure demolding degree. cooling time short or long. will temperature degree reduce to molding temperature degree value. design combined 理 顶杆位置 and amount. especially is non light slip easy 出现此 phenomenon. can method use sheet/plate structure 代替顶杆 structure, 设置曲形顶杆 structure. reduce mold temperature degree, long ring time. reduce injection molding pressure, decrease/reduce raw materials amount.

■ molding product 脆化

causes: drying degree 不够. mold temperature degree low, injection molding pressure and holding pressure pressure high. thick 不均, demolding defect internal force. 缺口效应. thermal degradation. mixed 入.

处理 methods: attention/notes drying machine and material tube/pipe 理. selection various combined conditions. remove thick structure remove 尖锐转角, positive gate 位置. reduce material temperature degree. material 斗, material 筒.
 

product grade main/primary applications high pure degree high flow PC DVD light specialized plastics raw materials

Makrolon 2205 极 easy flow injection grade, easy demolding

Makrolon 2207 极 easy flow injection grade, easy demolding

Makrolon 2405 easy flow injection grade, easy demolding

Makrolon 2407 easy flow injection grade, easy demolding

Makrolon 2458 easy flow injection grade, easy demolding

Makrolon 2605 in viscosity injection product grade, easy demolding

Makrolon 2607 in viscosity injection product grade, easy demolding

Makrolon 2658 in viscosity injection product grade, easy demolding

Makrolon 2805 in viscosity injection product grade, easy demolding

Makrolon 2807 in viscosity injection product grade, easy demolding

Makrolon 2808 in viscosity injection product grade, easy demolding

Makrolon 2858 in viscosity injection product grade, easy demolding

Makrolon 3103 high viscosity extrusion injection product grade, anti outer stability

Makrolon 3105 high viscosity extrusion injection product grade, easy demolding

Makrolon 3108 high viscosity extrusion injection product grade, EU/ FDA certification

Makrolon 3208 high viscosity extrusion injection product grade, EU/ FDA certification

Germany Bayer PC; 2205, 2207, 2405, 2407, 2458, 2605, 2607, 2658, 2805, 2807,2808,

2858, 3103, 3105, 3108, 3208, non reinforcement flame retardant grade: 6385, 6555, 6557, 6465, 6485,6870,

glass fiber reinforcement: 8025, 8035, 8345. glass fiber reinforcement flame retardant grade: 9415（Z),9125, 9425. impact modified

injection molding grade: KU1-1260, DP-1-1456, T7435, T7855, KU-1-1248, DP1-1825. grade: CD2005,

DP1-1265, LQ-2647, LQ2847, KU1-1216, LQ3147, AL2447, AL2647, 1239, 1143.