PROEXPORT / TECHNICAL KNOWLEDGE
Temperature Operating Ranges & Thermal Limits for Roller Coverings
Maximum allowable operating temperature depends on the elastomer matrix, adhesive bonding strength to the steel core, and internal hysteretic heat build-up under cyclic nip compression.
KNOWLEDGE & PRACTICE
Continuous and Peak Operating Temperature Limits
| Covering Material | Continuous / Peak Temperature | Critical Engineering Failure Mode |
|---|---|---|
| NR (Natural Rubber) | -30°C to +70°C (peak +80°C) | High resilience in sub-zero temps; hardens and loses elasticity above 70°C. |
| SBR (Styrene-Butadiene) | -25°C to +80°C (peak +90°C) | Moderate thermal stability; rapid mechanical degradation above 80°C. |
| NBR (Nitrile Rubber) | -20°C to +100°C (peak +120°C) | Standard industrial oil covering; special peroxide-cured blends reach +120°C continuous. |
| EPDM (Ethylene-Propylene) | -40°C to +130°C (peak +150°C) | Superior resistance to hot water, low-pressure steam, and polar fluids up to 130°C. |
| CR (Chloroprene / Neoprene) | -25°C to +100°C (peak +115°C) | Flame-retardant compound; stable up to 100°C in ozone-rich environments. |
| CSM (Hypalon® equivalent) | -20°C to +125°C (peak +140°C) | High resistance to oxidizing acids and elevated temperatures up to 125°C. |
| FKM / Viton® (Fluoroelastomer) | -15°C to +200°C (peak +230°C) | High thermal and chemical resistance for aggressive acid baths and hot oils. |
| Cast Polyurethane (TDI/MDI) | -20°C to +80°C (peak +90°C) | High mechanical strength; hydrolytic softening accelerates rapidly above 80°C. |
| Vulkollan® (1,5-NDI Covestro) | -25°C to +85°C (peak +100°C) | Minimal internal hysteresis under dynamic loads; withstands short peaks to 100°C. |
| Technical Silicone | -60°C to +200°C (peak +250°C) | Widest thermal envelope; non-stick release for hot-melt laminating nips. |
| Hard Chrome Plating | -40°C to +350°C (peak +450°C) | Galvanic layer thermally stable; core steel thermal expansion must be calculated. |
| Cr₂O₃ Plasma Ceramic | -50°C to +500°C (peak +600°C) | Maximum thermal endurance; thermal shock cycles must avoid interfacial bond failure. |
KNOWLEDGE & PRACTICE
Hysteretic Heat Build-up in Dynamic Nips
A critical distinction must be drawn between ambient/fluid contact temperature and internal hysteretic temperature. When an elastomer roller rotates under high nip pressure (N/mm), continuous compression and recovery cycles generate internal friction (loss tangent tan delta).
In heavy-duty applications (film calenders, high-speed slitting, heavy AGV wheels), internal temperature at the core-elastomer interface can exceed external surface temperature by 25°C to 40°C. If internal temperature passes the thermal decomposition limit of the bonding primer (typically 110°C–120°C for standard systems), catastrophic interfacial debonding occurs even if the outer surface feels warm rather than hot.
KNOWLEDGE & PRACTICE
Engineering Data Required for Thermal Specification
- Continuous process fluid/web contact temperature and maximum peak duration.
- Rotational speed (RPM) and outer peripheral surface velocity (m/min).
- Linear nip load (N/mm) and roller core wall thickness (for heat dissipation calculation).
- Internal core cooling status (rotary unions with chilled water / thermal oil circulation).
PROEXPORT / INDUSTRIAL ROLLERS
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