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polypropylene (PP) （PP） Common injection molding formed defect
polypropylene (PP) （PP） Common injection molding formed defect
一, polypropylene (PP) （PP） Common injection molding formed defect ——欠注
|
fault/failure analysis |
troubleshooting methods |
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process conditions control 不当. |
适当 adjustment. |
|
injection molding machine injection can force small parts weight. |
换 use relatively large specifications injection molding machine. |
|
runner and gate 截面太 small. |
适当 add large. |
|
mold cavity inner material flow 距离太 long or has thin separation. |
设置 cold material 穴. |
|
mold gas defect, mold cavity inner 残留空 gas 导致欠注. |
improvement mold gas system. |
|
raw materials flow property can 太差. |
换 use flow property can relatively good resin. |
|
material temperature degree low, injection pressure or material injection time short 也会引起欠注. |
versus improve/increase has process parameters control amount. |
二, polypropylene (PP) （PP） Common injection molding formed defect ——溢 material flash
|
fault/failure analysis |
troubleshooting methods |
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clamping force 不足. |
换 use specifications relatively large injection molding machine. |
|
mold or abrasion loss heavy. |
using/adopting machine processing methods 进行修复. |
|
mold clamping upper has material 杂质 |
进行清 remove. |
|
molding mold temperature or injection pressure high. |
应适当 reduce. |
三, polypropylene (PP) （PP） Common injection molding formed defect —— surface gas 孔
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fault/failure analysis |
troubleshooting methods |
|
thick parts mold runner and gate dimensions relatively small easy generate surface gas 孔. |
适当放 large runner and gate dimensions. |
|
塑 parts thick. |
in design 时应尽 amount decrease/reduce thick separation. |
|
molding temperature degree high or injection pressure low 都会导致塑 parts surface generate gas 孔. |
应适当 reduce molding temperature degree, improve/increase injection pressure. |
四, polypropylene (PP) （PP） Common injection molding formed defect ——流 material 痕
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fault/failure analysis |
troubleshooting methods |
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熔 material and mold temperature low. |
适当 improve/increase material and mold temperature degree. |
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injection speed degree slow |
适当 add fast injection speed degree. |
|
nozzle 孔径太 small. |
换 use relatively large nozzle. |
|
mold inner 未设置 cold material 穴. |
increase cold material 穴. |
五, polypropylene (PP) （PP） Common injection molding formed defect ——银 strip/profile filament
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fault/failure analysis |
troubleshooting methods |
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molding raw materials in water separation and easy material content high. |
for raw materials 进行预 drying 处理. |
|
mold gas defect. |
increase gas 孔, improvement mold gas property can. |
|
nozzle and mold defect. |
adjustment 两者 位置 and dimensions. |
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银 strip/profile filament is in 一定 部位出现, 应检查 for mold cavity surface is has surface 伤痕. |
采取 machine processing methods remove mold cavity surface 伤痕. |
|
different product types resin mixed combined 时, generate strip/profile 痕. |
anti types resin mixed use. |
六, polypropylene (PP) （PP） Common injection molding formed defect ——熔接痕
|
fault/failure analysis |
troubleshooting methods |
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熔 material and mold temperature degree low. |
improve/increase material and mold temperature degree. |
|
gate 位置设置不 combined 理. |
改变 gate 位置. |
|
raw materials in easy material content high or mold gas defect. |
remove raw materials inner easy material and improvement mold gas system. |
|
injection speed degree slow. |
适当 add fast injection molding speed degree. |
|
mold inner 未设置 cold material 穴. |
increase cold material 穴. |
|
mold cavity surface has material 杂质. |
进行清洁处理. |
|
浇注 system design combined 理. |
improvement system property can, make material in mold cavity in flow 顺畅. |
七, polypropylene (PP) （PP） Common injection molding formed defect ——黑 strip/profile and 烧焦
|
fault/failure analysis |
troubleshooting methods |
|
injection molding machine specifications large. |
换 use specifications relatively small injection molding machine. |
|
resin flow property can relatively 差. |
use amount external lubricant. |
|
injection pressure high. |
适当 reduce injection pressure. |
|
mold gas defect. |
improvement mold gas system, increase gas or using/adopting structure, and reduce clamping force. |
|
gate 位置设置不 combined 理. |
改变 gate 位置, make mold cavity inner material uniform flow. |
八, polypropylene (PP) （PP） Common injection molding formed defect —— bubbles
|
fault/failure analysis |
troubleshooting methods |
|
gate and runner dimensions small. |
适当 add large gate and runner dimensions. |
|
injection pressure low. |
适当 improve/increase injection pressure. |
|
raw materials inner water separation content high. |
for raw materials 进行预 drying 处理. |
|
塑 parts thick 变化太 large. |
combined design parts structure, 避免壁 thick 急变. |
九, polypropylene (PP) （PP） Common injection molding formed defect —— crazing and whitening
|
fault/failure analysis |
troubleshooting methods |
|
熔 material and mold temperature degree low. |
improve/increase material and mold temperature degree. |
|
mold system structure design combined 理. |
improvement mold runner and gate structure, make material in 充模时不 generate 紊流. |
|
cooling time short. |
适当延 long cooling time. |
|
demolding ejection plant/unit design combined 理. |
most good using/adopting gas demolding plant/unit. |
|
injection speed degree and pressure high. |
应适当 reduce injection speed degree and pressure. |
十, polypropylene (PP) （PP） Common injection molding formed defect —— bending deformation
|
fault/failure analysis |
troubleshooting methods |
|
mold temperature degree high or cooling 不足. |
适当 reduce mold temperature degree or long cooling time, for/regarding fine long parts can 采取胎 tool solid rear cooling methods. |
|
cooling non-uniform. |
improvement mold cooling system, ensure parts cooling uniform. |
|
gate type combined 理. |
针 for specific 情况, selection combined gate 形式. generally lower, can using/adopting more gate. |
|
mold 偏芯. |
进行检查 and positive. |
十一, polypropylene (PP) （PP） Common injection molding formed defect —— demolding defect
|
fault/failure analysis |
troubleshooting methods |
|
injection speed degree and pressure high. |
适当 reduce injection speed degree and pressure. |
|
mold type surface light degree 太差. |
through abrasion and electroplating and other methods improve/increase its surface light degree. |
|
mold temperature degree and cooling conditions control 不当. |
当塑 parts in 模芯处 mold sticking 时, improve/increase mold temperature degree and shrink short cooling time; if parts in type surface mold sticking 时, reduce mold temperature degree and long cooling time. |
|
demolding machine ejection 面积太 small. |
add large ejection 面积. |
十二, polypropylene (PP) （PP） Common injection molding formed defect —— shrinkage deformation
|
fault/failure analysis |
troubleshooting methods |
|
holding pressure 不足. |
适当延 long material injection time. |
|
injection pressure 不足. |
适当 improve/increase injection pressure. |
|
mold temperature degree high. |
适当 reduce mold temperature degree. |
|
gate 截面积太 small. |
适当 add large gate 截面积. |
|
processing temperature degree low. |
适当 improve/increase material temperature degree. |
十三, polypropylene (PP) （PP） Common injection molding formed defect —— true 空孔
|
fault/failure analysis |
troubleshooting methods |
|
holding pressure 不足. |
适当延 long material injection time. |
|
mold temperature degree low, material temperature degree high. |
适当 improve/increase mold temperature degree, reduce material temperature degree. |
|
injection pressure 不足. |
适当 improve/increase injection pressure. |
|
raw materials flow property can good. |
换 use melt relatively low resin. |
