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Changshu smoothly da plastic products factory to talk about the working principle of single screw plastic extruder
by：CSSSLD
2021-01-23
With the widely application of the plastic extruder molding process and the development, the type of plastic extruder are increasing, are not uniform classification method.
According to the space of the screw position can be divided into horizontal and vertical extruder;
According to the screw rotation speed and can be divided into common extruder, high-speed and speeding extruder;
According to the number of screw to points, divided into no screw extruder, single screw extruder, twin screw extruder and screw extruder, etc, the smooth da plastic products factory in changshu is to introduce the working principle of a single screw plastic extruder.
when the extrusion system of heating to a given process temperature and heat preservation time, start the motor, through the reducer for screw torque and rotational speed. Hopper of the plastic in weight or feeder, under the action of thrust of feeding mouth into the spiral groove. As the rotation of the screw, with the plastic barrel screw under the action of friction was forward delivery.
the plastic mouth after entering the screw, the screw under the action of rotating, through the inner wall of the cylinder and the screw on the surface of the friction effect forward delivery. In molding process, material in powder or granular from hopper to join to plastic extruder, to complete the transfer, compaction, compression, melt plasticization, all into uniform melting process. The screw feeding section, loose solid aggregate ( Or at the end of the material) Full of screw slot, with the continuous conveying of materials, material begin to be compacted. After the material into the compression section, because the screw screw groove depth becomes shallow gradually and the nose of the resistance, make plastic forming high pressure, and further be compacted at the same time, heating and outside the cylinder screw with a nitrogen-treated barrel inner surface of the material of strong shear friction stirring, mixing and internal friction, under the action of shear heat generated by plastic temperature rising, the point of connection with the cylinder, plastic temperature reaches melting point, began to melt. As the material conveying, continue to heat, molten material quantity increase gradually, but not the molten material quantity reduced correspondingly. About at the end of the compression section, all material transformation sticky flow pattern, but has not been evenly, then each point temperature after homogenization period of homogenizing effect is uniform, the screw will melt material quantitative, constant pressure and constant temperature squeezed into the nose. Plastic extruder die head in the mouth is a molding parts, materials and get through it a certain section of geometric shapes and sizes, after cooling stereotypes and other process, can get good products.
when the extrusion system of heating to a given process temperature and heat preservation time, start the motor, through the reducer for screw torque and rotational speed. Hopper of the plastic in weight or feeder, under the action of thrust of feeding mouth into the spiral groove. As the rotation of the screw, with the plastic barrel screw under the action of friction was forward delivery.
the plastic mouth after entering the screw, the screw under the action of rotating, through the inner wall of the cylinder and the screw on the surface of the friction effect forward delivery. In molding process, material in powder or granular from hopper to join to plastic extruder, to complete the transfer, compaction, compression, melt plasticization, all into uniform melting process. The screw feeding section, loose solid aggregate ( Or at the end of the material) Full of screw slot, with the continuous conveying of materials, material begin to be compacted. After the material into the compression section, because the screw screw groove depth becomes shallow gradually and the nose of the resistance, make plastic forming high pressure, and further be compacted at the same time, heating and outside the cylinder screw with a nitrogen-treated barrel inner surface of the material of strong shear friction stirring, mixing and internal friction, under the action of shear heat generated by plastic temperature rising, the point of connection with the cylinder, plastic temperature reaches melting point, began to melt. As the material conveying, continue to heat, molten material quantity increase gradually, but not the molten material quantity reduced correspondingly. About at the end of the compression section, all material transformation sticky flow pattern, but has not been evenly, then each point temperature after homogenization period of homogenizing effect is uniform, the screw will melt material quantitative, constant pressure and constant temperature squeezed into the nose. Plastic extruder die head in the mouth is a molding parts, materials and get through it a certain section of geometric shapes and sizes, after cooling stereotypes and other process, can get good products.
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