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Q

POM ejection scratches and ejector whitening

A

Ejection defects are a manifestation of imbalance between the demolding system and gripping force; balanced ejection combined with reduced gripping protects product surface quality.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling POM；ejector whitening；scratches；ejection；ejector pins；gripping

Q

POM precision edge flash

A

POM low-viscosity melt is sensitive to parting line precision; worsening flash indicates mold wear, and timely overhaul is needed to avoid batch dimensional defects.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling POM；flash；clamping force；parting line；wear；precision parts

Q

POM sink mark depressions

A

POM sink marks follow the general mechanism of insufficient feeding; thick-walled parts should start with structural coring-out, and process compensation can only alleviate, not cure.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling POM；sink marks；depressions；holding pressure；wall thickness；feeding

Q

POM insufficient draft scratching

A

Scratching caused by insufficient draft continues to worsen with mold wear; reserving sufficient draft at the new mold design stage costs far less than repairing the mold afterward.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling POM；draft；scratching；ejector whitening；ejection；design

Q

POM mold poor venting burn marks

A

Venting is a mandatory requirement in POM mold design; burn mark positions are the indication points for adding venting, and venting adequacy should be verified first when trying a new mold.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent rec...

Molds & Tooling POM；venting；burn marks；mold design；trapped air；parting line

Q

POM mold corrosion and rust

A

Formaldehyde corrosion is a unique equipment risk in POM processing; corrosion-resistant steel and shutdown cleaning protection together can significantly extend mold life.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling POM；formaldehyde；corrosion；mold steel；anti-rust；maintenance

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

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