Problem & Solution

Practical answers to common plastic material challenges

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Q

TPU product mold sticking

A

Mold sticking is one of the most common TPU problems; TPU itself is highly sticky, and only systematic troubleshooting of the three aspects of pressure, mold temperature, and mold surface can cure it; after confirming effectiveness, fix the parameters and practices into the work instruction to pr...

Injection Molding TPU；mold sticking；demolding；injection pressure；mold temperature；mold surface

Q

TPU scorch marks and burnt

A

For TPU scorch marks, suspect shear overheating first; compared with SEBS-based TPE, TPU is more sensitive to shear, and speed control is the first means of preventing scorching; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU；scorch mark；burnt；shear heat；injection speed；venting

Q

TPE overmolding thickness

A

Overmolding thickness is controlled by the mold and parameters; after confirming effectiveness, fix 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 later

Injection Molding TPEovermoldingthicknessmold

Q

TPE overmolding not firm

A

Overmolding bonding relies on the three elements of temperature, cleanliness, and compatibility; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar pro...

Injection Molding TPEovermoldingpeelinginterface

Q

TPE burnt and air traps

A

TPE burnt treatment prioritizes venting; speed control is a supporting means, and carbon deposit cleaning is routine maintenance; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPE；burnt；air trap；venting；injection speed

Q

TPE burrs and flash

A

For TPE flash, check filling, mold, and clamping; high-fluidity materials have higher mold precision requirements; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPE；burr；flash；parting line；clamping force

Q

TPE injection speed SBS/SEBS

A

The TPE speed strategy is graded by system; SBS seeks stability and SEBS seeks speed, and venting is the prerequisite for high speed; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPE；injection speed；SBS；SEBS；venting

Q

TPE injection pressure 2-3 tons

A

TPE pressure setting has a clear formula; 2-3 tons per square inch is the balance benchmark between clamping force and injection pressure; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPE；injection pressure；2-3 tons；clamping force；flash

Q

TPE Shrinkage Rate 1.0-2.5%

A

TPE shrinkage rate is graded by hardness and structure; shrinkage matching of overmolded parts is a special consideration in dimension design; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPE; shrinkage rate; 1.0-2.5%; hardness; overmolding

Q

TPE Overmolding Nylon

A

Overmolding nylon requires dedicated material plus 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 reference for troubleshooting similar problems in the future

Injection Molding TPE overmolding nylon preheating

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