The screw needs to be cooled when extruding the materia […]
The screw needs to be cooled when extruding the material, mainly to ensure the smooth progress of the production and prevent the material from decomposing due to the excessively high plasticizing temperature. For example, cooling in the feeding section of the screw is to prevent the temperature of the screw from being too high, and to prevent the material from being attached to the screw groove due to the high temperature and rotating with the screw, which affects the forward movement of the material and causes the normal production due to insufficient material supply. .
The homogenization section of the screw is cooled down because the molten material in this section is subjected to greater extrusion, friction and shearing, which generates a lot of heat and rises quickly. In order to prevent the decomposition of the material, it needs to be cooled down.
The method of cooling the screw is to pass water or oil into the screw drilled with the shaft hole as a heat transfer medium to cool down. The heat-conducting medium should be controlled at a constant temperature until it reaches the homogenization section of the screw. The screw that rotates during work needs a special pipe fitting to connect with the heat transfer medium pipeline. This special connecting piece is called a rotary joint.