Shop-Floor Defect Atlas & Troubleshooting Matrix

Mixing

Visual Symptoms Uneven coloration or visible agglomerates of carbon black, sulfur, or zinc oxide when sliced open.

Root Causes Short mixing time, incorrect rotor speed, low fill factor, or improper sequence of ingredient addition.

Corrective Actions Optimize ram pressure profile, extend mixing dispersion stage, and check raw material pre-weigh accuracy.

Mixing

Visual Symptoms Uneven coloration or visible agglomerates of carbon black, sulfur, or zinc oxide when sliced open.

Root Causes Short mixing time, incorrect rotor speed, low fill factor, or improper sequence of ingredient addition.

Corrective Actions Optimize ram pressure profile, extend mixing dispersion stage, and check raw material pre-weigh accuracy.

Extrusion

Visual Symptoms Extruded profile dimensions shrink excessively after cooling down on the conveyor belt.

Root Causes High internal compound stress, excessive cooling water temperature, or high compound filler loading.

Corrective Actions Optimize cooling trough temperature profiles, adjust pull-roller speeds to match extrusion rate, and check compound recipe.

Curing

Visual Symptoms Softening, brittle cracking, or loss of tensile strength in thick rubber components due to thermal aging in mold.

Root Causes Excessively long cure cycle timer, high press temperatures, or stalled press release mechanisms.

Corrective Actions Calibrate cure timers, audit press temperature controllers, and inspect emergency opening interlocks.

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