Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

General-purpose polyethylene injection molded products uneven surface gloss

A

Uneven gloss reflects inconsistency between the mold surface state and melt flow, and needs improvement from three aspects: mold polishing, temperature uniformity and injection process.

Injection Molding uneven glossmold polishingtemperature uniformityinjection speedcooling system

Q

General-purpose polyethylene injection molded products weld lines

A

Weld lines are a manifestation of poor melt convergence and fusion, improving melt fusion quality by increasing melt temperature, injection speed and mold temperature.

Injection Molding weld linemelt convergenceinjection speedmold temperaturegate design

Q

General-purpose polyethylene injection molded products burnt marks/burnt spots（Variant: Strengthened Measures）

A

Burnt marks are the result of trapped gas in the cavity being compressed and heated causing material carbonization; the core solution is to improve venting and reduce injection speed.Targeted preventive measures need to be taken in different production scenarios.

Injection Molding burnt marksburnt spotsmold ventinginjection speedtrapped gas compression

Q

General-purpose polyethylene injection molded products warpage deformation

A

Warpage deformation is the core difficulty of crystalline materials in '2079851475616104452; its essence is internal stress caused by non-uniform shrinkage, requiring systematic control from multiple dimensions: design, process and mold.

Injection Molding warpage deformationcrystallization shrinkagemold temperature uniformitywall thickness uniformitycooling time

Q

General-purpose polyethylene injection molded products stress whitening near the gate（Variant: Strengthened Measures）

A

Gate stress whitening is caused by excessive shear stress and molecular orientation, and is improved by enlarging the gate, reducing injection speed and increasing temperature.Targeted preventive measures need to be taken in different production scenarios.

Injection Molding stress whiteninggate shearmolecular orientationinjection speedgate size

Q

General-purpose polyethylene injection molded products surface cracking/microcracks（Variant: Strengthened Measures）

A

Microcracks are a manifestation of excessive residual internal stress, and need to be prevented by optimizing temperature parameters, reducing internal stress and improving demolding conditions.Targeted preventive measures need to be taken in different production scenarios.

Injection Molding crackingmicrocracksinternal stressmolecular orientationdraft angle

Q

General-purpose polyethylene injection molded products uneven color/color difference（Variant: Strengthened Measures）

A

Color difference is caused by uneven colorant dispersion or process parameter fluctuations, requiring consistency assurance from three aspects: mixing, plasticization and temperature control.Targeted preventive measures need to be taken in different production scenarios.

Injection Molding color differencecolor masterbatch dispersiontemperature stabilityback pressurescrew mixing

Q

General-purpose polyethylene injection molded products underfill/short shot（Variant: Strengthened Measures）

A

Short shot is the result of insufficient melt flowability or excessive filling resistance, and needs to be solved by increasing temperature, pressure and improving the gate and venting system.Targeted preventive measures need to be taken in different production scenarios.

Injection Molding short shotunderfillinjection pressuremelt flowabilitymold venting

Q

General-purpose polyethylene injection molded products sink marks at thick-wall areas

A

Sink marks are a typical defect of crystalline materials in '2079851475616104452; the root cause is that local volume shrinkage is not effectively fed, and it needs to be solved coordinately from three aspects: holding pressure parameters, gate design and cooling conditions.

Injection Molding sink markholding pressurecrystallization shrinkagegate designwall thickness uniformity

Q

General-purpose polyethylene injection molded products surface flow marks（Variant: Strengthened Measures）

A

Flow marks are a manifestation of an unstable melt flow front, stabilizing the flow front by increasing injection speed, mold temperature and melt temperature.Targeted preventive measures need to be taken in different production scenarios.

Injection Molding flow marksinjection speedmold temperaturemelt frontmulti-stage injection

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