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Twin screw extruder and the second

by:CSSSLD     2021-01-23
Using single and double screw base equipment modification, and ultra-high molecular weight polyethylene in extrusion process develop severe molecular shear than other molding method, reduce the relative molecular mass of the injection molding products processing, impact on the performance of products especially wear resistance performance. Screw extrusion of high efficiency, is used to heat the ultra-high molecular weight polyethylene materials and delivery to the storage bin. Using the high pressure plunger, does not occur in the shear, not affected by the relative molecular mass height restriction under the condition of extrusion forming, the raw material processing real ultra-high molecular weight polyethylene products.

filter plate aperture to reasonable choice, too big don't shunt effect, too small makes extrusion resistance increasing. Forming of UHMWPE pipe shape, traction, cutting and other auxiliaries and ordinary pipe auxiliary basic same, but also need to make the necessary local modification. Sizing the size of the cooling jacket design should be based on the size of the UHMWPE expansion after the mold to determine, tractor should have enough traction and clamping force, otherwise it will appear the phenomenon of slippage, cutting tool should be sharp, to ensure rapid cutting UHMWPE pipes.

although has been widely used both at home and abroad, but only relative molecular quality products and its average relative molecular mass of 150 - 2. 5 million, even if such liquidity by adding modifier. Although the plunger extrusion can be extrusion is greater than the relative molecular mass of 2. 5 million ultra-high molecular weight polyethylene products, but because of the extrusion molding was continuous sintering suppression, so very slow, affected the production efficiency.

single screw extruder extruding UHMWPE pipe technology has been to develop in the direction of large diameter, in order to satisfy the demands of a broader market. Twin screw extruder extrusion of ultra-high molecular weight polyethylene with two screw together with self-cleaning function, the material force, have axial conveying material effect, so there is no need to slot on the cylinder. To reduce the number of material shear, ensure material relative molecular mass is not reduced, it is best to use synthetic rotating twin screw extruder.

if the counter-rotating twin screw extruder, although the mixing effect is good, but due to the separation force is bigger, shearing action in the clearance between the screw place is bigger, easy to make the material overheating phenomenon, thus make relative molecular quality degradation, relative molecular mass, USES the same phase double screw, there is no problem. In addition, in order to avoid the degradation of ultra-high molecular weight polyethylene, guarantee the stability of the material flow and ensure the quality of products. The speed of the screw shoulds not be too high.

in the lower head resistance, improve the uniformity of the principle to determine the mold flow channel, and molding segment, must have the appropriate length, too short to make after shunt bar of multiple strands of injection molding processing material effective fusion, long resistance increases, the tube billet tube billet can not discharge smoothly. Between the nose and the extruder filter plate makes the installation of material rotation movement into linear motion, so as to improve the uniformity of material moving in the flow channel.

due to the particularity of ultra-high molecular weight polyethylene with him, had better use special extruder or ultra-high molecular weight polyethylene modified extruder for processing, due to the high illiquid, viscosity high extrusion pressure big, so to adopt high strength thrust bearing, in addition to the screw of the spiral groove to deep some. Both single screw extruder and twin screw extruder, due to the high viscosity of ultra-high molecular weight polyethylene, liquidity is poor, so the mold and the general plastics extrusion mold is different, compression ratio are smaller than normal.

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