·High-Rigidity Quenched and Tempered Alloy Steel Substrate
Maintains roller body deflection ≤0.0025mm under continuous tension load, preserving roll shape stability during long-term high-speed operation. MDO Preheating Roller continuously bears film tension throughout the process. Ordinary rollers tend to develop slight deflection under long-term load, causing film stress imbalance. 42CrMo4 integral forging with multiple aging treatments fully releases internal stress, providing ample rigidity margin. Under 180m/min high-speed continuous tension load, roller bending deformation is strictly controlled, eliminating frequent shutdowns for roll parallelism recalibration and ensuring long-term continuous stretching stability.
·Ultra-Precision Mirror Hard Chrome Surface
Delivers low-friction contact surface with Ra≤0.01μm, preventing film adhesion and scratching during ultra-thin substrate stretching. Ultra-fine grinding combined with dense hard chrome electroplating produces a smooth surface free from microscopic protrusions. For 8–120μm ultra-thin cast sheets and breathable film substrates, the film surface is not scratched during transport. When processing biodegradable materials or filled modified films, low-molecular additives do not easily adhere to the roller surface, simplifying routine cleaning and effectively reducing surface crystal spots and scratch defects.
·G1.0 Highest Grade Dynamic Balancing
Achieves radial runout ≤0.003mm, eliminating periodic vibration marks and film wrinkling at high speed. Longitudinal stretching units have stringent requirements for roller running smoothness. Even slight vibration causes transverse film wrinkling and periodic thickness fluctuations. Factory implementation of G1.0 high-precision dynamic balancing with integrally machined journals and roller body ensures vibration-free high-speed operation, guaranteeing smooth film transport and uniform tension transfer, meeting high-precision stretching requirements for lithium battery separators and premium packaging films.
·Wide-Temperature Stable Structure
Supports continuous operation from 40℃ to 180℃ with controllable heating and cooling rates, accommodating multi-stage gradient preheating processes. Metallurgical structure undergoes stabilization heat treatment, preventing cumulative thermal stress deformation under frequent heating and cooling cycles. Supports gradient heating schemes on production lines, allowing cast sheet to gradually reach ideal stretching temperature and avoiding internal stress concentration from sudden temperature rise, suitable for MDO longitudinal stretching, breathable film micro-pore forming, and biaxial orientation preheating processes.
·Thermal Performance Optimization
Optimized shell wall thickness consistency and spiral flow channel lead achieve 30% improved heat exchange efficiency with faster temperature response. Many manufacturers use simple heating rollers as substitutes for professional preheating stretching rollers, resulting in crude flow channel design, uneven wall thickness, and excessive temperature deviation during wide-width production. Roller surface temperature quickly follows line speed changes during acceleration and deceleration, significantly reducing waste during changeover. Uniform heating across the entire film width improves stretching ratio consistency, narrows finished product thickness tolerance, and enhances batch-to-batch stability of longitudinal tensile strength and tear strength.
·Long-Term Production Reliability
Dense wear-resistant chrome layer resists scratches and localized wear from long-term film friction, extending mirror surface retention period. Internal flow channels pass 1.6MPa hydrostatic pressure testing without leakage risk, suitable for long-term thermal oil circulation heating. Roller body provides excellent thermal cycling resistance, maintaining dimensional stability on intermittent start-stop lines with extended replacement cycles. Localized minor damage supports on-site polishing repair without factory return and re-plating, shortening downtime for maintenance.
·Finished Product Quality Enhancement
Uniform heating across the entire film width improves stretching ratio consistency and narrows finished product thickness tolerance. Molecular chain orientation becomes uniform, enhancing batch-to-batch stability of longitudinal tensile strength and tear strength. Stretching white spots, crystal spots, wrinkles, and scratch defects are significantly reduced, improving yield rates for high-end functional films. Balanced internal stress distribution in the film prevents curling and warping issues in subsequent aging and slitting processes.
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