Plastic eyeglass frame shape and defect review

Plastic frame finishing needs observations for whitening, scratches, rounded corners, warpage and inaccessible bridge or hinge regions. Select the defects actually observed, then review the literal source checks. Preserve lens-groove geometry and frame-shape measurements as part of the acceptance record. A gloss improvement on an accessible surface does not demonstrate that corners, frame alignment or recessed features remain acceptable.

Review frame whitening, corners, warpage and recessed features

White or cloudy surfaceFine scratches remainFrame corners become roundedFrame shape changes or warpsBridge or hinge areas remain dull

Select the entries relevant to your review.

Plastic eyeglass frame shape and defect review - First review field for each entry - Jintaijin — First review field for each entry. Original diagram of qualitative source fields; not a trial outcome.

Keep shape, corners and recessed features in the same review

Possible causes are hypotheses; source adjustments are conditional review directions, not approved settings or confirmed diagnosis. Check feature access and media lodging on representative parts; chemistry and operating limits require supplied guidance. Keep every selected requirement with the part and the actual trial record. Selecting a row does not show that its acceptance condition has been met.

Confirm the exact frame resin and protected geometry

The source table is for plastic eyeglass frames and does not identify every resin or supplied thermal limit. Confirm the actual material and finishing method, record protected dimensions, and compare representative parts under agreed inspection conditions. Smaller-media directions still require lodging and separation checks.

Reviewed source reference

White or cloudy surface

Likely Cause: Excessive friction, dry contact, or unsuitable media

What to Check: Media type, moisture, compound, cycle time

Recommended Adjustment: Use gentler media and reduce heat or friction buildup

Fine scratches remain

Likely Cause: Previous sanding marks too deep or media too coarse

What to Check: Initial surface preparation and media grade

Recommended Adjustment: Add controlled smoothing before final polishing

Frame corners become rounded

Likely Cause: Cycle time too long or contact too aggressive

What to Check: Corner radius, edge definition, processing time

Recommended Adjustment: Shorten cutting stage and separate final polishing

Frame shape changes or warps

Likely Cause: Heat, pressure, or excessive batch impact

What to Check: Machine motion, load size, drying temperature

Recommended Adjustment: Reduce heat exposure and avoid heavy part-on-part contact

Bridge or hinge areas remain dull

Likely Cause: Media cannot reach narrow or recessed areas

What to Check: Media size, lens groove, hinge geometry

Recommended Adjustment: Test smaller or better-shaped media without causing lodging

Read the Jintaijin technical article. Source table reviewed 3 October 2026. Possible causes, directions and adjustments remain conditional reference fields.

Plastic eyeglass frame shape and defect review - Risks or checks remain visible - Jintaijin — Risks or checks remain visible. Original diagram of qualitative source fields; not a trial outcome.

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