Problem & Lösung

Praktische Antworten auf häufige Herausforderungen mit Kunststoffmaterialien

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Q

PMMA High Melt Viscosity and Difficult Filling

A

PMMA filling relies on pressure and mold temperature compensation rather than simply raising temperature; high-flow grades and runner optimization can fundamentally widen the window.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Processing Machinery PMMA; viscosity; filling; short shot; pressure; flow

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 Haze Increase and Loss of Transparency

A

Haze is a comprehensive quantitative indicator of PMMA optical quality; batch monitoring linked with process records can quickly lock onto the root cause of fluctuations.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Material Drying PMMA; haze; transparency; internal stress; cooling; monitoring

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 Trapped Air Burning

A

PMMA is sensitive to trapped-air defects and burn marks are irreparable; venting design is a mandatory mold requirement, and depth must be controlled per specification to prevent flash.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Injection Molding PMMA; burnt; trapped air; vent groove; injection speed; end

Q

PMMA Surface Flow Marks and Jetting Marks

A

Flow marks affect the optical appearance that PMMA values most; gate design and speed profile are the main control means, and fan gates with slow filling are recommended for optical parts.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recur...

Injection Molding PMMA; flow mark; jetting mark; gate; injection speed; appearance

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

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