Extrusion, also known as extrusion, is a plastic molding process and one of the important methods for thermoplastic molding.
Extrusion is to heat the plastic raw material to make it in a viscous flow state. Under the action of pressure, it is formed into a continuum with a cross-section similar to the shape of the die through the extrusion mold, and then cooled and shaped into a glass state, which is obtained by cutting Plastic products with a certain geometric shape and size.
"For example, in an extruder, the material is heated and pressurized to make it into a melt flow state, and then it is continuously extruded from a die to form it, which is called extrusion. This method can prepare tubes, tubes, rods, films, sheets, profiled materials, wires, etc.
In addition to extrusion molding, common plastic molding processes include injection molding, molding, blow molding, rotational molding, casting, dip molding, etc. Different plastic molding processes can be specifically selected according to different materials and products.
The basic principle of plastic profile extrusion:
The plastics processing industry is a highly comprehensive technological industry. It involves polymer chemistry, polymer physics, interface theory, plastic machinery, plastic processing molds, formula design principles and process control. Extrusion theory mainly studies the movement and changing laws of plastics in the extruder. The relationship between the three physical states of the polymer in the extruder under a certain external force in different temperature ranges and the screw structure, plastic properties, and processing conditions. So as to carry out reasonable process control. In order to achieve the purpose of improving the output and quality of plastic products. Plastic polymer materials, when heated under constant pressure, appear in three physical states: glassy, highly elastic, and viscous fluid states in different temperature ranges. Generally, the molding temperature of plastic is above the viscous flow temperature.