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Q

COC Recycled Material Optical Downgrade

A

The use of COC recycled material in optical parts must be extremely conservative; a slight loss of light transmittance may break through the customer specification; downgraded utilization is a safe route.; After confirming effectiveness, fix the parameters and practices into the work instruction ...

Molds & Tooling COC; recycled material; optics; haze; light transmittance; downgrade

Q

COC Mold Vent Blockage

A

COC vent blockage is a progressive failure; periodic maintenance is the only reliable countermeasure; defect trend monitoring allows early intervention.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling COC; vent; blockage; volatiles; maintenance; trapped gas

Q

COC Thick-walled Optical Part Long Molding Cycle

A

The cycle contradiction of COC thick-walled parts is resolved by variable mold temperature and structural design; the cost of blindly shortening cooling is deformation and cracking; cycle optimization should first calculate the heat balance.

Molds & Tooling COC; thick wall; cooling; cycle; variable mold temperature; deformation

Q

COC Medical Part Cleanliness Exceeding Standard

A

COC medical part cleanliness is a whole-chain project; the static adsorption characteristic requires stricter environmental control; ultrasonic cleaning is the key post-treatment to meet the standard.; After confirming effectiveness, fix the parameters and practices into the work instruction to p...

Molds & Tooling COC; medical; particle; cleanliness; static electricity; cleaning

Q

COC Obvious Ejector Pin Marks

A

COC ejector pin marks are the combined result of temperature and pressure; the ejection design of optical parts should prioritize function; local cooling enhancement is the most direct process means.; After confirming effectiveness, fix the parameters and practices into the work instruction to pr...

Molds & Tooling COC; ejector pin mark; ejection; cooling; optics; pressure

Q

COC Gate Mark and Jetting Mark

A

COC gate mark treatment mainly relies on multi-stage injection and gate design; the gate position of transparent parts should avoid the main viewing area at the design stage; shear control runs through the whole process.

Molds & Tooling COC; jetting mark; gate; multi-stage injection; snake pattern; transparent

Q

COC Shrinkage Rate Estimation Deviation

A

COC low shrinkage is an advantage, but accurate values still depend on grade data; precision part molds should leave compensation allowance; the process sensitivity of amorphous materials cannot be ignored.

Molds & Tooling COC; shrinkage rate; dimension; grade; mold repair; precision

Q

COC Hot Runner Internal Heating Failure

A

COC hot runner selection follows the material supplier's recommendation: external heating first; the uncontrollable temperature zone of internal heating is a breeding ground for degradation and blockage; the gate temperature must be actually measured.

Molds & Tooling COC; hot runner; external heating; gate; temperature control; degradation

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

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