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Run: Blown Film Bubble Stability and Gauge Band Check

Use this blown film bubble stability and gauge band check to catch instability, frost line drift, and thickness variation before off-spec rolls build up. It ...

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Inspection Details

Line or machine identified critical (required)

Shift and date recorded critical (required)

Product grade or resin lot recorded

Inspector name recorded critical (required)

Bubble Stability

Bubble is stable with no visible oscillation critical (required)

Yes No N/A

No signs of bubble flutter, surging, or wandering critical (required)

Yes No N/A

Air ring, cooling, and draft conditions appear consistent

Yes No N/A

Any unusual noise, vibration, or instability observed

Frost Line Height and Process Control

Frost line height within target range critical (required)

Note (optional)

Frost line is uniform and not visibly fluctuating critical (required)

Yes No N/A

Cooling air and ambient drafts are not affecting the bubble

Yes No N/A

Process adjustments made during this shift

Gauge Bands and Thickness Variation

No visible gauge bands on film web or roll critical (required)

Yes No N/A

Thickness variation is within specification critical (required)

Yes No N/A

No scratches, tears, wrinkles, or edge defects linked to instability

Yes No N/A

Defect location and roll number recorded if a band or variation was found

Corrective Actions and Closeout

Corrective action taken or escalation initiated critical (required)

Affected rolls placed on hold or identified for review critical (required)

Yes No N/A

Inspector sign-off completed critical (required)

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