Problem & Solution

Practical answers to common plastic material challenges

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Q

PMMA Regrind Silver Streak Cracks

A

The solvent resistance of regrind PMMA decreases significantly; low-aggression materials should be selected for painting and filling processes, and regrind should be used cautiously for products with high appearance requirements.; After confirming effectiveness, fix the parameters and practices i...

Molds & Tooling PMMA; regrind; silver streaks; solvent; paint filling; cracks

Q

PMMA Mold Temperature Too Low and High Stress

A

Mold temperature is the core parameter of PMMA stress management; high and stable mold temperature can reduce residual stress by 30~60%, and optical and load-bearing parts should be strictly controlled.; After confirming effectiveness, fix the parameters and practices into the work instruction to...

Molds & Tooling PMMA; mold temperature; internal stress; relaxation; gloss; cracking

Q

PMMA Vent Groove Depth Improper

A

Vent groove depth is a fine parameter of PMMA molds; take the specification range between preventing flash and ensuring venting, and arrange with emphasis at filling ends.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Molds & Tooling PMMA; vent groove; depth; flash; trapped air; mold

Q

PMMA Pin-Point Gate Flow Marks

A

Gate form has a direct influence on PMMA optical quality; fan gates with low shear and wide feeding are the recommended structure for high-transparency products.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Molds & Tooling PMMA; pin-point gate; flow mark; fan gate; shear; optical

Q

PMMA Mold Surface Poor Replication

A

The surface condition of the PMMA mold determines the optical quality of the product; mirror polishing and clean maintenance are the basic investment for transparent part production.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Molds & Tooling PMMA; mold; polishing; replication; haze; surface

Q

PMMA Ejection Drag Marks and Whitening

A

Ejection damage destroys PMMA's surface and optical quality; draft angle, polishing and ejection balance are the three design essentials, and whitened parts should not be downgraded for use.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent rec...

Molds & Tooling PMMA; ejection; drag marks; whitening; draft angle; polishing

Q

PMMA Sink Mark Depression

A

PMMA sink mark treatment follows the feeding compensation logic; sink marks on transparent parts also have optical effects, and structural uniformity is more reliable than process compensation.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent ...

Molds & Tooling PMMA; sink mark; holding pressure; wall thickness; feeding compensation; coring out

Q

PMMA Product Surface Orange Peel

A

Orange peel = replication.

Molds & Tooling PMMA; orange peel; replication; mold temperature

Q

PMMA Product Corner Chipping and Edge Breaking

A

Corner chipping = brittleness + sharp corners.

Molds & Tooling PMMA; corner chipping; sharp corner; ejection

Q

PMMA Surface Scratches

A

Scratches = full-chain protection from demolding to packaging.

Molds & Tooling PMMA; scratches; draft angle; ejector pins; packaging

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