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Plastic Sheet Extrusion Line Extrusion System
- Nov 02, 2017 -

Plastic Sheet Extrusion Line Extrusion System


The extrusion system consists of screws, barrels, hoppers, heads, and molds. Plastic Sheet Extrusion Line Plastic is extruded into a uniform melt by squeezing the system and, under the pressure established in this process, Out of the head.


Screw: The most important part of the Plastic Sheet Extrusion Line, which is directly related to the application range and productivity of the Plastic Sheet Extrusion Line, made of high strength corrosion resistant alloy steel.


Barrel: is a metal cylinder, generally with heat, high compressive strength, durable wear, corrosion-resistant alloy steel or alloy steel alloy made of composite steel pipe. Barrel and screw with the realization of the plastic crushing, softening, melting, plasticizing, exhaust and compaction, and to the forming system continuous uniform transport of rubber. The length of the general barrel is 15 to 30 times its diameter, so that the plastic is fully heated and fully plasticized to the principle.
Hopper: The bottom of the hopper is equipped with a truncation device to adjust and cut the material. The side of the hopper is equipped with a viewing hole and a calibration metering device.


Nose and die: the nose is made of alloy steel inner sleeve and carbon steel jacket. The machine head is equipped with forming mold. The action of the head is to convert the plastic melt of the rotary motion into parallel linear motion, And give plastic to the necessary molding pressure. Plastic sheet Extrusion Line plastic in the barrel of plasticized compaction, the porous filter plate along a certain flow through the nose of the nose into the nose forming mold, the core mold sleeve with the appropriate cross-section to form a continuous reduction of circular space, so that The plastic melt forms a continuous, dense tubular coating around the core. In order to ensure that the plastic channel within the machine is reasonable, to eliminate the accumulation of plastic dead ends, often placed a shunt sleeve, to eliminate the pressure when the plastic extrusion fluctuations, but also set the pressure ring. The head is also equipped with a mold correction and adjustment of the device, easy to adjust and correct the core and die sets of concentricity.


Plastic Sheet Extrusion Line Split the nose into angled head (angle 120o) and right angle head according to the direction of the head flow and the angle of the screw centerline. The head of the nose is fixed with bolts on the fuselage, the mold inside the die has a core sitting, and fixed with a nut in the nose into the line port, the core seat in front of a core, core and core The center of the hole, for the core through the core in the front with a pressure ring, for the balance of pressure, squeeze the molding part of the module by the mold and mold sleeve, mold sleeve position can be adjusted by the bolt to support , To adjust the relative position of the mold sleeve on the core, easy to adjust the uniformity of the thickness of the extruded layer, the head is equipped with external heating device and temperature measurement device.


In addition, the weight of the machine is small and the weight of the reducer is small, which means that the unit cost of high-speed and high-efficiency extruder is lower than that of ordinary extruder.


Heating and cooling device


Heating and cooling is a necessary condition for the plastic extrusion process to be carried out.
Plastic Sheet Extrusion Line is usually used in electric heating, divided into resistance heating and induction heating, heating film installed in the fuselage, machine neck, nose parts. The heating device is heated by an external heating cylinder to raise the temperature to achieve the desired temperature for the process operation.


The cooling device is designed to ensure that the plastic is at the temperature range required by the process. Specifically, it is necessary to eliminate the excess heat generated by the shear friction of the screw rotation in order to avoid excessive temperature to make the plastic decomposition, scorch or stereotypes difficult. Cooling is divided into two kinds of water cooling and air-cooled, generally small and medium-sized Plastic Sheet Extrusion Line with air-cooled more appropriate, large-scale use of water or two forms of combined cooling; Plastic Sheet Extrusion Line screw cooling mainly central water cooling, the purpose is But also in the hopper at the cooling, first, in order to strengthen the role of solid material transport, to prevent the temperature of the plastic particles sticky plugging mouth, and second, to ensure that the transmission of the material, but also to improve the quality of the material, Part of the normal work.


Mr. Kevin Wang 

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