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Practical answers to common plastic material challenges

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Q

TPU Burrs and Flash

A

TPU burr troubleshooting proceeds from easy to difficult; five routes progress stepwise: raw material, pressure, clamping, mold, equipment; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU; burr; flash; clamping force; mold wear

Q

TPU Injection Speed Control

A

TPU speed strategy is stability-first; the balance between shear degradation and flow marks relies on medium-low speed plus temperature compensation; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU; injection speed; medium-low speed; shear; flow mark

Q

TPU Injection Pressure Grading

A

TPU pressure setting should be tailored to each part; high pressure buys filling, but also brings flash and stress risks; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU; injection pressure; grading; thin wall; flash

Q

TPU Overmolding Injection

A

Overmolding bonding strength relies on surface and preheating; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future

Injection Molding TPUovermoldingmetalbonding

Q

TPU narrow processing window

A

The narrow window of TPU is its process difficulty; equipment precision and parameter discipline are the prerequisites for stable production; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU；narrow window；temperature control；±3℃；equipment

Q

TPU nozzle drool

A

Drooling both wastes raw material and introduces cold material defects; temperature and back pressure adjustment combined with an anti-drooling structure can solve it; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU；nozzle；drooling；temperature；back pressure；anti-drooling

Q

TPU under-injection short shot

A

TPU short shot is troubleshooted along the three routes of feeding, temperature, and pressure; high-viscosity grades require higher filling energy; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU；short shot；under-injection；melt temperature；injection pressure；feeding

Q

TPU pockmarks and shrinkage wrinkles

A

Pockmarks and shrinkage wrinkles are the appearance of imbalanced feeding compensation and temperature management; troubleshoot in the order of pressure, temperature, feeding, and gate; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU；pockmark；shrinkage wrinkle；injection pressure；mold temperature；gate

Q

TPU product dents and sink marks

A

TPU sink marks are adjusted along the two lines of feeding compensation and temperature; structural uniformity is the fundamental solution for thick-walled parts; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU；dent；sink mark；feeding compensation；injection pressure；venting

Q

TPU burrs and flash

A

TPU low-viscosity melt is sensitive to parting line precision; dual reduction of temperature and pressure usually takes effect quickly; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU；burr；flash；injection pressure；clamping force；temperature

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