Technical Definition and Core ValuePVC heat shrink film is a functional packaging material primarily made from polyvinyl chloride (PVC) resin, produced through extrusion blowing and(oriented stretching) processes. Its core value lies in the "memory effect" of thermally activated molecular chains: wh

The Essence of the Technology: From Uniform Coating to Micron-level Control Gravure coating technology is a process that achieves precise transfer of coatings through the micro-cavity structure on the surface of a gravure roller. Its core lies in using a metal roller engraved with regular geometric

Technical Essence: The Molecular Revolution of Elasticity and Environmental ProtectionTPU (Thermoplastic Polyurethane) film is a high-performance material realized through molecular design of polyester/polyether segments and isocyanates. Its core value lies in integrating the elasticity of rubber wi

Stretching occurs because the velocity of the filament extruded from the spinneret is lower than the moving speed of the winding device, i.e., the stretching speed is higher than the spinning speed, causing the diameter of the as-spun fiber to be smaller than that of the spinneret orifice. In chemical fiber production, stretching can be carried out continuously following the spinning process, or separately from the spinning process using wound yarn or as-spun fibers pre-wound on bobbins or in silk cans.

First, heat the extruder to the predetermined temperature, then start the screw and feed materials simultaneously. Extrusion molding is a continuous process, with the key being the adjustment of initial extrusion parameters. It is necessary to adjust process parameters such as the temperature of each heating zone in the extruder barrel, the temperature of the die head, and the screw rotation speed according to the extrusion process properties of the plastic and the structural characteristics of the extruder die head, so as to control the temperature and pressure distribution of the material within the barrel. According to the requirements for the shape and dimensions of the product, adjust the die size, concentricity, traction equipment, and other devices to control the exit swelling and shape stability of the extrudate, thereby ultimately controlling the output and quality of the extrudate until the extrusion reaches normal operation for continuous production.