Cast Stretching Machine: The "Genetic Remodeling" of Polymer Films!
Time：
2025-07-14 14:27
As the masterpiece of composite process equipment, the cast stretching machine achieves precise regulation of material microstructure through the synergistic effect of cast molding and biaxial stretching! With 15 years of technical accumulation, Sumino Seiko has broken through the limitations of traditional equipment——
I. Why is the cast stretching process irreplaceable?
Performance leap: First, casting lays the foundation thickness, then biaxial stretching orients the molecular chains, doubling strength and barrier properties;
Defect elimination: Eliminates fish eyes and crystal points in the blown film process, achieving an optical-grade surface;
Thin revolution: Mass production of micron-level ultra-thin films, with costs dropping directly.
Industry consensus: The core processes of "bottleneck" materials such as high-end lithium battery separators and capacitor films all rely on cast stretching machines!
II. Three major technological innovations of cast stretching machines
Co-extrusion cast base film forming
Multi-layer melts are precisely compounded through a hanger-type die, eliminating interface stress and providing a perfect base for stretching.
Asynchronous biaxial stretching
Longitudinal pre-stretching + transverse slow shaping, suitable for elastic materials such as TPU and bio-films, with shrinkage rate approaching zero.
Online structure locking
Rapid cooling with two-stage air knives, thermal shrinkage rate breaks industry limits, and dimensional stability subverts imagination.
III. Overcoming industry pain points - Sumino Seiko's solutions
Thickness fluctuation: Closed-loop thickness measurement is linked with die bolts for real-time correction;
Film breaking risk: Pneumatic clamps adapt to the ductility of substrates, with tension responding in milliseconds;
Energy consumption bottleneck: Recycling of stretching waste heat to the casting section, doubling comprehensive energy efficiency.
IV. Empowering golden application scenarios
Lithium battery separators
The cast stretching machine produces ultra-thin separators with breakthrough pore uniformity, achieving both excellent puncture strength and ion conductivity.
Photovoltaic encapsulation film
After cast stretching of POE substrates, anti-PID performance and weather resistance are improved, and the module life exceeds industry standards.
Medical dialysis membranes
Precise control of asymmetric gradient structure, increased small molecule flux, and biocompatibility reaching implant-grade standards.
Optical display base films
Surface haze approaches zero, replacing imported optical PET and helping to upgrade the folding resistance of foldable screens.
Sumino Heavy Machinery Industry (Nanjing) Co., LTD.
CONTACT US
Adress：No. 116, Suyuan Avenue, Jiangning District, Nanjing
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