Shop-Floor Defect Atlas & Troubleshooting Matrix

Extrusion

Visual Symptoms Micro-cracks or continuous tearing along the sharp edges of the tread wing during extrusion run.

Root Causes Extrusion temperature too low, die lips improperly heated, or compound scorch safety margin breached.

Corrective Actions Increase die head heating zone temperatures, check compound Mooney, and reduce line speed.

Extrusion

Visual Symptoms Micro-cracks or continuous tearing along the sharp edges of the tread wing during extrusion run.

Root Causes Extrusion temperature too low, die lips improperly heated, or compound scorch safety margin breached.

Corrective Actions Increase die head heating zone temperatures, check compound Mooney, and reduce line speed.

Calendering

Visual Symptoms Fabric cords wavy, bunched, or misaligned across the width of the rubberized ply sheet.

Root Causes Uneven nip pressure across calendar rolls, incorrect roll camber, or improper let-off tension control.

Corrective Actions Adjust roll parallelism, recalibrate hydraulic gap control, and increase brake tension on the fabric let-off stand.

Calendering

Visual Symptoms Fabric cords wavy, bunched, or misaligned across the width of the rubberized ply sheet.

Root Causes Uneven nip pressure across calendar rolls, incorrect roll camber, or improper let-off tension control.

Corrective Actions Adjust roll parallelism, recalibrate hydraulic gap control, and increase brake tension on the fabric let-off stand.

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