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.

Technical Definition and Core PrinciplesSolventless lamination is a production process that bonds two or more base materials (such as plastic films, aluminum foil, and paper) using 100% solid adhesives. Its core breakthrough lies in completely eliminating organic solvents. Materials like polyurethan

Industry Background and Technical PositioningAs a key equipment in modern manufacturing, coating machines have become core production tools in fields such as printing and packaging, new energy electronics, medical materials, and construction. They achieve this by precisely applying coatings, adhesiv

Industry Background and Core ValueComposite films are functional materials made from flexible materials such as plastics, aluminum foil, and paper through multi-layer co-extrusion, coating, or lamination processes. They combine high barrier properties, tear resistance, and light weight, making them