TENGDA Is a Professional Plastic Extruder Machine Manufacturers in China.
Lab Scale TPE Thermoplastic Elastomers

The working principle of plastic extruder is like this

by:TENGDA     2023-01-15
As an important equipment for plastic molding, the plastic extruder performs plastic transportation, compaction, melting, shear mixing and extrusion molding through external power transmission and heat transfer of external heating elements. For the plastics industry, there are three main characteristics:
First, the industry is increasingly paying attention to high-efficiency and energy-saving technologies, and energy-saving, high-efficiency, and high-yield plastic extruders have become an important direction of technological innovation;
Second, the demand for high-performance flexible packaging films in industrial fields such as food, beverages, and new energy continues to rise, which promotes the continuous innovation of multi-layer co-extrusion technology of plastic films;
Third, China's extrusion technology has begun to increase research and development efforts in the fields of various supporting parts and auxiliary equipment, and the pace of application and expansion of new technologies has accelerated, promoting the rapid improvement of the overall technical level.
The plastic extruder is also constantly improving and perfecting. During the operation, the solid plastic is transformed into a uniform melt by means of heating, pressure and shearing, and the melt is sent to the next process. The production of the melt involves The process of mixing additives such as color masterbatch, blending resin and re-grinding. The finished melt must be uniform in concentration and temperature. The applied pressure must be great enough to squeeze out the viscous polymer. The plastic extruder completes all the above processes through a barrel with a screw and a screw channel. The plastic pellets enter the barrel through the hopper at one end of the barrel, and then are conveyed to the other end of the barrel through the screw. In order to have enough pressure, the depth of the flight on the screw decreases with the distance from the hopper. External heating and internal heat generated by friction between the plastic and the screw make the plastic soften and melt. Generally, different polymers have different applications. The plastic extruder is designed to discharge ports, multiple feeding ports, and along the screw. Special mixing devices, cooling and heating of the melt, external heat sources, relative size of the gap between the screw and the barrel, and the number of screws, etc.

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