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Custom Industrial Rubber Covered Roller | Autoclave Vulcanization · PU/NBR/Silicone · 24-48h Curing
Rubber covered rollers consist of a metal core covered with high-performance elastomer through vulcanization, comprising an outer rubber layer, hard rubber layer, metal core, roll neck, and vent holes.
Key Process Steps:
1. Compound Mixing: Rubber content 25%-85%, hardness ±0–90 degrees. Mixed on open mills or internal mixers; filtered to remove impurities; calendered/extruded/fabricated into bubble-free sheets or strips.
2. Molding (Application): Rubber applied and covered on metal core; visual inspection and limited storage period after molding. Metal core requires sandblasting for bonding strength.
3. Vulcanization (Critical Step):
Large/medium rollers use autoclave vulcanization, primarily steam-heated
Slow temperature/pressure increase to prevent delamination from differential shrinkage between rubber and metal core
Large rollers require 24–48 hours in autoclave for uniform vulcanization, approximately 30–50 times normal rubber curing time
Hollow iron-core rollers use indirect steam vulcanization with 1–2x extended time
4. Surface Finishing: Grinding (mechanical turning and polishing) → final polishing → thorough dust removal. Roller surfaces must be free of impurities, pinholes, bubbles, scars, cracks, and other defects.
Custom Compounds:
NBR Rollers: Oil and wear-resistant, for printing, dyeing, petrochemical
PU Rollers: Ultra-high wear resistance, tensile strength 3x and wear resistance 5x natural rubber
Silicone Rollers: High/low temp resistance (-100℃ to 350℃), for plastic film coating, food packaging
NR Rollers: High elasticity, for conveying equipment
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