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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; calendered/extruded into bubble-free sheets.
2. Molding: Metal core requires sandblasting for bonding strength; visual inspection and limited storage period after molding.
3. Vulcanization (Critical Step):
Large/medium rollers use autoclave vulcanization, steam-heated
Slow temperature/pressure increase to prevent delamination from differential thermal expansion
Large rollers require 24–48 hours in autoclave, 30–50 times normal curing time
4. Surface Finishing: Grinding → polishing → thorough dust removal. Surfaces must be free of impurities, pinholes, bubbles, scars, cracks.
Custom Compounds:
NBR Rollers: Oil and wear-resistant, printing/dyeing/petrochemical
PU Rollers: Tensile strength 3x and wear resistance 5x natural rubber
Silicone Rollers: -100℃ to 350℃ resistance, plastic film coating/food packaging
NR Rollers: High elasticity, conveying equipment
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