Shop-Floor Defect Atlas & Troubleshooting Matrix

Tyre Building

Visual Symptoms Distorted or bunched carcass cords near the bead turning area during green tyre assembly.

Root Causes Improper turn-up bladder pressure, incorrect bead seating position, or stretched fabric plies.

Corrective Actions Regulate turn-up bladder inflation air pressure profile and inspect bead lock collet alignment.

Tyre Building

Visual Symptoms Distorted or bunched carcass cords near the bead turning area during green tyre assembly.

Root Causes Improper turn-up bladder pressure, incorrect bead seating position, or stretched fabric plies.

Corrective Actions Regulate turn-up bladder inflation air pressure profile and inspect bead lock collet alignment.

Extrusion

Visual Symptoms Extruded tread or profile width and thickness dimensions fall outside engineering tolerance limits; wavy edges.

Root Causes Inconsistent compound Mooney viscosity, variable extruder barrel/head temperatures, or worn screw flights.

Corrective Actions Blend compound batches to normalize Mooney viscosity, calibrate barrel heating/cooling zones, and inspect screw/barrel wear.

Extrusion

Visual Symptoms Extruded tread or profile width and thickness dimensions fall outside engineering tolerance limits; wavy edges.

Root Causes Inconsistent compound Mooney viscosity, variable extruder barrel/head temperatures, or worn screw flights.

Corrective Actions Blend compound batches to normalize Mooney viscosity, calibrate barrel heating/cooling zones, and inspect screw/barrel wear.

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