Problem & Solution

Practical answers to common plastic material challenges

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Q

POM Shrinkage Out of Tolerance

A

POM dimensional management is based on measured shrinkage; 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 subsequent similar problems

Extrusion & Post POMshrinkage ratedimensionSPC

Q

POM First Article and Patrol Inspection

A

POM first article verification must include weight; qualified appearance does not mean normal plasticization—data-based patrol inspection prevents batch accidents; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling POM;first article verification;weight;SPC;material change

Q

POM Printing and Bonding Difficulty

A

The timeliness of POM surface treatment is key; process immediately after treatment, and only with special consumables can adhesion be durable; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post POM;printing;bonding;corona;surface energy

Q

POM Glass Fiber Reinforced Deformation

A

Glass fiber POM trades directionality for strength; orientation design and shrinkage correction are required courses at the mold stage; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling POM;glass fiber reinforcement;warpage;floating fiber;shrinkage correction

Q

POM Regrind Usage Ratio

A

POM regrind has a clear ratio discipline; the 20-30% upper limit plus use-based grading balances cost and quality; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Production & Quality POM;regrind;20-30%;heat history;ratio

Q

POM Pits and Pockmarks

A

Troubleshoot POM pockmarks along the three lines of feeding, mold temperature, and venting; the difference from sink marks lies in distribution pattern and causal path; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Injection Molding POM;pockmark;pit;feeding;venting

Q

POM Discoloration Systematic Troubleshooting

A

POM discoloration requires systematically lowering temperature, pressure, and speed; single-point adjustments treat symptoms not the root cause—dead spots and small machines are the radical cure; after confirming effectiveness, solidify the parameters and practices into the work instruction to pr...

Injection Molding POM;discoloration;shear heat;dead spot;machine matching

Q

POM Delamination and Peeling

A

Contamination is the number one suspect in POM delamination; gate and cold slug well are the second check, and cleaning verification closes the loop; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post POM;delamination;contamination;gate;cold slug well

Q

POM Sink Mark Depression

A

POM sink mark control prioritizes holding pressure with structure as backstop; gate position and rib design are the fundamental countermeasures on the mold side; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling POM;sink mark;holding pressure;gate position;rib

Q

POM Short Shot Troubleshooting

A

POM short shot troubleshooting goes equipment first, process second; the three checks of bridging, check valve, and cushion are the fixed opening moves; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling POM;short shot;check valve;bridging;cushion

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