Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

POM thick-walled part internal voids

A

Thick-wall voids are structural defects; coring-out design is the most effective countermeasure, and process means have limited feeding capability for ultra-thick sections.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Processing Machinery POM；voids；thick wall；feeding；coring out；structural design

Q

POM gear precision out of tolerance

A

The core of precision POM gears is the predictability of shrinkage; a stable process window plus sufficient aging is the prerequisite for ensuring tooth profile precision.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding POM；gear；precision；shrinkage；dimensional stability；inspection

Q

POM flow lines and flow marks

A

Flow marks reflect a melt front temperature management problem; POM has good flowability and can be improved by appropriately increasing temperature and speed, but care must be taken not to exceed the decomposition temperature upper limit.; after confirming effectiveness, fix the parameters and p...

Injection Molding POM；flow marks；ripples；melt front；temperature；speed

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 internal stress cracking and embrittlement

A

Internal stress cracking has a lag and is difficult to detect at the factory; a mild process with low pressure and high mold temperature is the prevention principle, and critical parts should undergo stress verification.; after confirming effectiveness, fix the parameters and practices into the w...

Extrusion & Post POM；internal stress；cracking；embrittlement；annealing；mold temperature

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 screw speed too fast overheating

A

Shear heat is an invisible variable in POM temperature control; although medium-low speed plasticizes slightly slower, it brings melt temperature stability and reduced degradation risk, with better overall benefit.; after confirming effectiveness, fix the parameters and practices into the work in...

Processing Machinery POM；screw speed；shear heat；melt temperature；decomposition

Q

POM excessive back pressure degradation and discoloration

A

POM is shear sensitive, and back pressure is an overlooked source of temperature rise; low back pressure with reasonable melt temperature is a safe setting that balances plasticizing quality and degradation prevention.; after confirming effectiveness, fix the parameters and practices into the wor...

Processing Machinery POM；back pressure；shear heat；degradation；discoloration；plasticizing

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