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During the plastic extrusion process, the plastic melt will be decomposed into residues after long-term plasticization and heating, and the impurities in the raw materials will be added. Once they enter the extruder head, the flow channel will be blocked, the plastic products will be defective, and even cannot be produced normally.
In order to filter out the impurities and allow the pure melt to enter the extrusion molding head smoothly, a screen changer is generally installed between the screw head and the extrusion molding head to prevent impurities and foreign matter from entering the molding head.
It can be roughly divided into two categories, one is a non-continuous screen changer, when the screen is changed, the melt flow (or instantaneous) is interrupted or the screen needs to be stopped for screen change; the other is a continuous screen changer, which can change the screen continuously, automatically, without stopping the machine, and the material flow is not interrupted.
During the plastic extrusion process, the plastic melt will be decomposed into residues after long-term plasticization and heating, and the impurities in the raw materials will be added. Once they enter the extruder head, the flow channel will be blocked, the plastic products will be defective, and even cannot be produced normally. Therefore, in order to filter out impurities and allow pure melt to enter the extrusion molding head smoothly, during plastic extrusion production, a screen changer is generally installed between the screw head and the extrusion molding head to prevent impurities and foreign matter from entering the molding head.
However, to ensure the use effect, the filter screen must be installed appropriately, not too large or too small. The front and back of the replaced screen changer must be cleaned, and copper sheets should be used as much as possible during cleaning. At the same time, the screen change process must be in place at one time, and there is no need to pause during the screen change process. And when changing the screen, try to change it when the machine is stopped, otherwise it is easy to damage the equipment.
At the same time, when the machine is turned on to change the screen, the production speed should be reduced before changing, and the pipe should be marked when changing (the number of meters must be calculated, and a section of the pipe must be thinned when changing the screen, and the thinned part should be cut off in time when entering the cutting machine). Then, when the current melt pressure is 20% higher than the melt pressure when the machine is turned on, the filter screen should be replaced in time. Finally, under no circumstances is it allowed to install or disassemble the filter block and adjust the various structural parts when the oil pump motor is rotating, and when taking out the blocked mesh, the reciprocating plate cannot be used as a fulcrum to pry the filter outward.

At the same time, when the machine is turned on to change the mesh, the production speed must be reduced before replacement, and the pipe must be marked when changing (the number of meters must be calculated, and a section of the pipe must become thinner when changing the mesh, and the thinned part should be cut off in time when entering the cutting machine). Then, when the current melt pressure is 20% higher than the melt pressure when the machine is turned on, the filter should be replaced in time. Finally, under no circumstances is it allowed to install or disassemble the filter block and adjust the various structural parts when the oil pump motor is rotating, and when taking out the blocked mesh, the reciprocating plate cannot be used as a fulcrum to pry the filter outward.