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Solid Wall Pipe Extrusion Lines Extrusion System
- Jun 15, 2017 -

Solid Wall Pipe Extrusion Lines Extrusion system

In the plastic extrusion molding equipment, plastic extruder is usually called the host, and its supporting follow-up equipment, plastic extrusion machine is called auxiliary. Plastic extruder after 100 years of development, has been derived from the original single screw twin screw, multi-screw, and even no screw and other models. Plastic extruder (host) can be with the pipe, film, holding materials, monofilament, flat wire, packing belt, squeeze network, plate (film) material, profile, granulation, cable coating and other plastic molding auxiliary Matching, forming a variety of plastic extrusion molding production lines, the production of various plastic products. Therefore, the plastic extrusion molding machinery, whether present or future, are the plastics processing industry is widely used in one of the models.

The main body of the plastic extruder is the extruder, which consists of an extrusion system, a drive system and a heating and cooling system.

Extrusion system

The extrusion system consists of screws, barrels, hoppers, heads, and molds, which are plasticized into a uniform melt through the extrusion system and are continuously extruded by the screw under the pressure established during this process.

⑴ screw: the extruder is the most important components, it is directly related to the scope of application of extruder and productivity, made of high strength corrosion-resistant alloy steel.

⑵ barrel: is a metal cylinder, generally with heat, pressure strength is high, durable wear, corrosion-resistant alloy steel or alloy steel alloy made of composite steel pipe. The barrel is screwed with the screw to achieve crushing, softening, melting, plasticizing, venting and compaction of the plastic, and continuously conveying the compound to the forming system. 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.

⑶ hopper: hopper at the bottom with a truncation device in order to adjust and cut off the material, the side of the hopper with the hole and calibration metering device.

⑷ head and die: the nose from the alloy steel sleeve and carbon steel jacket, the head with a molding die, the role of the nose is the rotation of the plastic melt into a parallel linear motion, uniform and smooth into the mold Set, and give plastic to the necessary molding pressure. Plastic in the barrel of plastic compaction, the porous filter plate along a certain flow through the nose of the nose into the nose forming mold, mold core sleeve with the appropriate cross-section to form a continuous reduction of the annular gap, so that the plastic melt in the A thick, tubular coating is formed around the core. In order to ensure that the plastic channel inside 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 mold correction and adjustment of the device, easy to adjust and correct the core and die sets of concentricity.

Extruder in accordance with the direction of the head material and the angle of the screw center line, the machine will be divided into angled nose (angle 120o) and right angle head. The head of the nose is fixed with bolts on the fuselage, the die inside the mold has a core sitting, and fixed with a nut in the nose into the line port, the front of the core seat with a core, core and core The center of the hole, for the core, in the front of the nose with a pressure ring, for the balance of pressure, squeeze the molding part of the module by the sleeve 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.