The plastic extrusion supplier will share with you: the process of plastic extrusion molding pipes as follows: According to the plastic tube molding material formula requirements, measure the various raw materials into the mixing chamber of the mixer, stir at high speed, Various raw materials are mixed uniformly; the mixed high-temperature materials are mixed and cooled (generally the material temperature should be lower than 40 ℃) and then put into the hopper of the extruder; Inside the barrel; as the screw rotates, the raw material is forced to be pushed forward of the barrel.
Due to the resistance of the filter screen, perforated plate and molding die in front of the barrel, and the gradual reduction of the screw thread volume, the resistance of the raw material in the barrel to move forward increases with the increase of the amount of material in the front. That is, the pressure of the raw material is increasing; at the same time, the raw material is affected by the external heating of the barrel and is squeezed, sheared and stirred in the barrel, plus the friction between the raw material and the barrel and the threaded working surface and The conditions such as the mutual motion and friction between the raw material molecules gradually increase the temperature of the raw material in the barrel, and the physical state of the raw material gradually changes from a glassy state to a molten highly elastic state, and finally becomes a viscous fluid state, achieving complete plasticization. Since the screw is constantly rotating at a constant speed, the plasticized uniform molten material is extruded from the mouth of the forming die at equal pressure and equal amount to form a plastic pipe blank. After cooling and shaping, cutting according to a certain length, the plastic extrusion pipes are completed.
Plastic Extrusion Pipe
Polyvinyl chloride pipe extrusion molding process sequence:
The extrusion molding of PVC plastic pipe can use single screw extruder or twin screw extruder. The production process routes of the two extruders for extruding plastic pipes are slightly different.
①Single-screw extruder for extrusion of PVC pipe raw 45 sequence: the material of the extruded pipe is measured according to the formula → high-speed hot mixed raw material → mixed uniform material to cool down → granulation → the extruder plasticizes the raw material into a molten state → Mold forming tube blank → Cooling and setting → Pipe cooling and cooling → Traction → Cutting → Flaring → Checking the quality → Checking the weight into the warehouse.
② Twin screw extruder extrusion molding PVC production process sequence: the extruder molding tube material is measured according to the formula requirements → high-speed hot mixing of raw materials → mixed uniform material cooling and cooling → the extruder plasticizes the raw material into a molten state → mold forming Pipe blank → cooling and setting → pipe cooling and cooling → traction → cutting → flaring → check quality → check weight storage.
The production process route of soft PVC pipe extrusion molding is the same as that of rigid polyvinyl chloride production process, except that the mold structure for the extrusion of the preform, the method of cooling and shaping the pipe, and the collection of the pipe Rolling is different from hard tube forming.
Polyolefin plastic pipe extrusion molding process sequence:
Polyolefin plastic pipe extrusion molding production process route is relatively simple, in general, no raw material preparation is required. When producing polyolefin-based pipes, pellets can be directly put into the extruder hopper for extrusion molding. The production process sequence of polyolefin plastic pipe extrusion molding is as follows: raw material opening bag inspection quality → extruder plasticizes and melts the raw material → mold forming tube blank → vacuum sizing sleeve cooling sizing → vacuum spray cooling → pipe cooling → traction → coiling → inspection quality → check weight storage.
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