Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

POM weld line low strength

A

POM weld line strength depends on front temperature and meeting conditions; temperature and speed adjustments are constrained by the decomposition upper limit, and gate design should be used to avoid critical stressed areas when necessary.

Injection Molding POM；weld line；strength；meeting；front temperature；gate

Q

POM surface streaks and silver threads

A

Streaks and silver threads mostly originate from degradation or trace moisture; troubleshoot from the three aspects of temperature, residence time, and drying, starting with the easiest adjustment, cooling.; after confirming effectiveness, fix the parameters and practices into the work instructio...

Material Drying POM；streaks；silver threads；degradation；residence time；drying

Q

POM mold sticking and difficult demolding

A

POM mold sticking is mostly due to cold mold gripping and insufficient draft; mold temperature and demolding structure design are the prevention priorities, and the mold surface needs repair after scratching.; after confirming effectiveness, fix the parameters and practices into the work instruct...

Molds & Tooling POM；mold sticking；demolding；draft；mold temperature；ejection

Q

POM product warpage deformation

A

POM warpage is jointly driven by uneven crystallization shrinkage and stress; mold temperature balancing is the primary adjustment means, and combined with holding pressure and gate optimization, stable dimensions can be obtained.; after confirming effectiveness, fix the parameters and practices ...

Molds & Tooling POM；warpage；deformation；mold temperature；crystallization shrinkage；holding pressure

Q

POM dimensions continue to shrink after demolding

A

POM post-shrinkage is an inherent material characteristic; dimensional judgment must be made after sufficient aging, and mold compensation and cooling shaping must reserve shrinkage allowance.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent r...

Molds & Tooling POM；post-shrinkage；dimension；crystallization；aging；shrinkage

Q

POM product black specks

A

Black specks originate from the slow release of carbide inside the equipment; regular preventive purging is more economical than after-the-fact handling, and black speck records can guide purge cycle setting.; after confirming effectiveness, fix the parameters and practices into the work instruct...

Molds & Tooling POM；black specks；carbonization；burnt material；purging；barrel

Q

POM product stains and color contamination

A

Stain problems point to material contamination; cleaning management and standardized material change are the fundamentals of prevention, and precision products should establish raw material protection and purge confirmation processes.; after confirming effectiveness, fix the parameters and practi...

Processing Machinery POM；stains；contamination；foreign matter；material change；cleaning

Q

POM product silver streaks

A

POM silver streaks need to be distinguished between two sources: moisture and decomposition; verify by drying first and then troubleshoot temperature, and item-by-item confirmation according to the mechanism can avoid blind machine adjustment.; after confirming effectiveness, fix the parameters a...

Material Drying POM；silver streaks；drying；moisture；decomposition；back pressure

Q

POM local discoloration trapped air burning

A

The root cause of local burning is adiabatic compression of trapped air; venting design and injection speed are the two major adjustment means, and vent groove depth must be opened according to POM characteristics specifications.; after confirming effectiveness, fix the parameters and practices i...

Injection Molding POM；burning；trapped air；venting；adiabatic compression；injection speed

Q

POM product discoloration and scorch marks

A

Discoloration and scorch marks are direct visible signals of POM thermal decomposition; temperature management and stagnant material cleaning are equally important, and after scorch marks appear, the machine should be fully purged before continuing production.; after confirming effectiveness, fix...

Processing Machinery POM；discoloration；scorch marks；thermal decomposition；stagnant material；cleaning

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