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Q

PMMA Annealing 70-90℃

A

Annealing is a pre-process for PMMA post-processing; annealing is mandatory before bonding and screen printing, and 70-90℃×4h is the standard combination; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Extrusion & Post PMMA; annealing; 70-90℃; 4 hours; stress

Q

PMMA Mold Temperature 40-80℃

A

PMMA mold temperature is the main variable of stress management; optical parts prefer high rather than low, combined with annealing to achieve low-stress molding; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Molds & Tooling PMMA; mold temperature; 40-80℃; optical parts; stress

Q

PMMA Melt Temperature 200-250℃

A

Within the PMMA temperature window, internal stress and sink marks trade off against each other; optical parts favor higher temperature to reduce stress, thick-wall parts need balance to prevent sink marks; After confirming effectiveness, fix the parameters and practices into the work instruction...

Material Analysis PMMA; melt temperature; 200-250℃; internal stress; sink mark

Q

PMMA Drying 70-100℃×8h

A

PMMA drying duration is differentiated by equipment type; 70-100℃×8h is the conservative standard for ordinary barrels, vented barrels are the exception; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Material Drying PMMA; drying; 70-100℃; 8 hours; bubbles

Q

PMMA Production Environment Dust

A

Cleanliness management of transparent parts runs through the entire production; static elimination and a clean environment are yield guarantees.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Processing Machinery PMMA; dust; static electricity; cleanliness; packaging; environment

Q

PMMA Product Optical Distortion

A

Optical distortion is a surface shape precision problem; symmetric cooling and structural design are the basis for ensuring window part quality.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Molds & Tooling PMMA; optical distortion; surface shape; cooling; stress; window

Q

PMMA Dryer Dew Point Failure

A

Drying effect is determined by dew point, not by time alone; dew point monitoring should be included in equipment inspection items.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Material Drying PMMA; dryer; dew point; molecular sieve; bubbles; inspection

Q

PMMA Poor Ultrasonic Welding

A

PMMA welding requires dedicated parameter development; matching of energy director and energy is the quality key.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Processing Machinery PMMA; ultrasonic welding; energy director; strength; parameters

Q

PMMA Laser Cutting Edge Stress

A

The thermal influence of laser processing needs supporting post-treatment; annealing and edge treatment can eliminate crack hazards.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Molds & Tooling PMMA; laser cutting; edge; microcrack; annealing; stress

Q

PMMA Hot Runner Dead Corner Black Streaks

A

Intermittent black streaks point to hot runner stagnation; dedicated dead-corner-free hot runner systems are recommended for transparent parts.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Molds & Tooling PMMA; hot runner; black streaks; dead corner; carbonization; cleaning

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All Topics 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