Problema y solución

Respuestas prácticas a los desafíos comunes de los materiales plásticos

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Q

COC Demolding Damage

A

COC demolding design standard aligns with PS; large draft angle and large-area ejection are the two iron rules; ejection damage prevention of brittle materials beats all post-remediation.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurr...

Molds & Tooling COC; demolding; ejector whitening; draft angle; ejector pin; brittleness

Q

COC Sink Marks and Shrinkage Cavities

A

COC low shrinkage does not equal no sink marks; the objective function of holding time is the minimum value of sink mark disappearance; over-holding introduces new stress cracking risk.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling COC; sink mark; holding pressure; shrinkage cavity; wall thickness; gate

Q

COC Short Shot Insufficient Filling

A

COC short shot treatment first temperature then speed then venting; medium-high speed filling is the officially recommended process; microstructure parts need special verification of replication integrity.; after confirming effectiveness, fix the parameters and practices into the work instruction...

Injection Molding COC; short shot; filling; viscosity; injection speed; venting

Q

COC Bonding Assembly Difficulty

A

COC bonding difficulty originates from low-polarity surface, activation treatment is the standard pre-process; treatment timeliness management is often overlooked; adhesive system needs compatibility verification with the medium environment.

Extrusion & Post COC; bonding; plasma; surface energy; adhesion; timeliness

Q

COC Brittle Fracture

A

COC brittleness is an inherent material characteristic, design and material selection are the main countermeasures; impact-modified grades can improve to above 100J/m; mechanical conditions must be re-evaluated when replacing PC.

Material Analysis COC; brittleness; impact; notch; modification; fracture

Q

COC Improper Mold Temperature Setting Poor Surface

A

The core lever of COC surface quality is mold temperature; high mold temperature process close to Tg is standard for optical parts; mold temperature controller selection must cover the high-temperature section with precise control.

Injection Molding COC; mold temperature; surface; optical; Tg; flow mark

Q

COC Internal Stress Causing Stress Cracking

A

The concept of COC stress management is prevention first; low-stress process combination needs to be verified and fixed at the mold trial stage; end-use medium contact test cannot be omitted.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent re...

Injection Molding COC; stress cracking; internal stress; holding pressure; segmented injection; verification

Q

COC Residence Time Too Long Degradation

A

The 15-minute residence red line is a hard constraint of the COC process; shutdown cooling operation must be written into the work instruction; the weight matching of machine and product is often overlooked but is the main cause of degradation.

Processing Machinery COC; residence time; degradation; shutdown; 15 minutes; purging

Q

COC Melt Temperature Too High Yellowing

A

COC yellowing is the signal of dual control failure of temperature and residence time; each grade has different temperature upper limit and must be confirmed one by one; optical parts have zero tolerance for yellowing, temperature management starts from actual barrel measurement.

Processing Machinery COC; yellowing; melt temperature; residence time; thermal oxidation; grade

Q

ASA Deformation Recurrence After Annealing

A

ASA annealing temperature is delicate work, both insufficient and excessive fail; after confirming effectiveness, fix 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 annealing deformation recurrence temperature window slow cooling

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