Shop-Floor Defect Atlas & Troubleshooting Matrix

Calendering

Visual Symptoms Rubber skim thickness is too thick in the center and thin on the edges (or vice versa).

Root Causes Roll bending under high separating loads or improper thermal crown adjustment on calendar rolls.

Corrective Actions Adjust roll cooling/heating circulation to modify thermal crown, or recalibrate roll-crossing mechanisms.

Calendering

Visual Symptoms Rubber skim thickness is too thick in the center and thin on the edges (or vice versa).

Root Causes Roll bending under high separating loads or improper thermal crown adjustment on calendar rolls.

Corrective Actions Adjust roll cooling/heating circulation to modify thermal crown, or recalibrate roll-crossing mechanisms.

Tyre Building

Visual Symptoms Asymmetrical green casing or tread placement causing high radial and lateral force variation post-cure.

Root Causes Worn building drum segments, misaligned laser guides, or uneven operator hand-stitching pressure.

Corrective Actions Calibrate and align building drum expansion mechanics, realign laser centering lines, and inspect automatic stitchers.

Tyre Building

Visual Symptoms Asymmetrical green casing or tread placement causing high radial and lateral force variation post-cure.

Root Causes Worn building drum segments, misaligned laser guides, or uneven operator hand-stitching pressure.

Corrective Actions Calibrate and align building drum expansion mechanics, realign laser centering lines, and inspect automatic stitchers.

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