How is the extrusion principle of plastic hose machine?

Weifang Jin Shida Plastic Machinery Factory to provide you with explanations: The basic principle of plastic extruder Spiral feed, the principle of the material Extruder out of the machine function is the use of heating, pressure and shear, etc., the solid plastic into a uniform Consistent melt, and the melt to the next process. Melt production involves blending masterbatches and other additives, blending resins, and then pulverizing. The finished melt must be uniform in concentration and temperature. Pressurization must be large enough to extrude the tacky polymer. Extruder through a barrel with a screw and spiral to complete all of the above process. Plastic pellets enter the barrel through the hopper at one end of the barrel and are then routed to the other end of the barrel by a screw. In order to have sufficient pressure, the thread depth on the screw drops as the distance to the hopper increases. External heating and internal heat generated by friction between the plastic and the screw cause the plastic to soften and melt. Is a simplified extruder. Different polymers and different applications, the design requirements of the extruder are often different. Many options relate to the discharge port, the multiple feed openings, the special mixing device along the screw, the cooling and heating of the melt, or the absence of an external heat source (adiabatic extruder), a relative change in the gap between the screw and the barrel , And the number of screws and so on. For example, twin-screw extruders provide more thorough melt mixing than single-screw extruders.