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Q

POM low water absorption drying specification

A

POM drying is icing on the cake rather than a lifeline; routine 80°C×2-4h, moisture-affected material must be baked, appearance parts have a fixed drying process; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Material Drying POM；drying；low water absorption；80°C；surface gloss

Q

Jetting flow marks on POM product surface

A

Jetting marks can be effectively controlled with the speed profile alone; low initial speed lets the melt spread out before speeding up, balancing appearance and cycle time.；After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding POM；jetting mark；injection speed；gate；multi-stage injection

Q

Color mixing caused by incomplete POM barrel cleaning

A

Stubborn color mixing points to material hidden in mechanical dead corners; disassemble and clean when necessary, and rely on standardized cleaning procedures daily to control material accumulation in dead corners.；After confirming effectiveness, fix the parameters and practices into the work ins...

Processing Machinery POM；cleaning；color mixing；dead corner；screw；material change

Q

Bubbles and silver streaks caused by improper POM drying

A

Although POM's drying requirements are lower than those of PA and PET, standardized drying is still required in humid environments; seasonal defect outbreaks often correspond to humidity changes.；After confirming effectiveness, fix the parameters and practices into the work instruction to prevent...

Material Drying POM；drying；moisture content；bubble；silver streak；humidity

Q

Short shot caused by early POM gate freezing

A

The gate freezing time determines the effective feeding window; POM should adopt a larger gate design, combined with mold temperature management for holding pressure efficiency.；After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling POM；gate；freezing；holding pressure；feeding；short shot

Q

POM product deformation out of tolerance after aging

A

POM dimensional judgment must allow sufficient aging time; for temperature-rise conditions, hot-state dimensions should also be evaluated to avoid disputes over post-shipment shrinkage out of tolerance.；After confirming effectiveness, fix the parameters and practices into the work instruction to ...

Molds & Tooling POM；post-shrinkage；aging；dimension；thermal aging；inspection

Q

Control of POM's narrow processing temperature window

A

Narrow-window materials have high requirements for equipment consistency; using the measured melt temperature rather than the set value as the unified benchmark across machines is the key practice for stable quality.；After confirming effectiveness, fix the parameters and practices into the work i...

Processing Machinery POM；temperature window；temperature control accuracy；machine difference；calibration

Q

Coexisting dents and vacuum bubbles in POM products

A

The combination of sink mark plus vacuum bubble strongly indicates a structural wall thickness problem; design modification is fundamental, and process adjustment can only partially alleviate it.；After confirming effectiveness, fix the parameters and practices into the work instruction to prevent...

Processing Machinery POM；sink mark；vacuum bubble；wall thickness；coring out；holding pressure

Q

POM mold parting line material leakage

A

Parting line material leakage needs to distinguish between wear and insufficient clamping; the former requires mold repair and the latter machine adjustment, and misjudgment causes flash to recur.; after confirming effectiveness, fix the parameters and practices into the work instruction to preve...

Molds & Tooling POM；parting line；flash；clamping force；wear；mold repair

Q

POM product ejector pin marks

A

Ejector pin marks are the result of improper ejection timing and layout; sufficient cooling plus reasonable ejection design can eliminate the risk of marks and micro-cracks.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling POM；ejector pin marks；ejection；cooling；layout；gripping

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카테고리

전체 주제 11636 Material Drying 1439 Injection Molding 1506 Molding Process 740 Molds & Tooling 1506 Processing Machinery 2025 Extrusion & Post 2239 Blow Molding 315 Thermoforming 141 Material Analysis 1343 Production & Quality 382