Special screw for single-screw plastic extruding machine
A plastic extruder and single screw technology, applied in the field of extruder screw, can solve the problems of large influence of plasticization and molding effect, material overheating, large motor power consumption, etc., to improve extrusion efficiency and final product High quality, strong material conveying ability and ideal homogenization effect
Pending Publication Date: 2017-06-13
安徽汇东机械有限责任公司
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Problems solved by technology
[0002] Single-screw extruder is an important plastic extrusion molding equipment. The screw is the main part of the extruder, which is related to the application range and production efficiency of the extruder. The structural characteristics and basic parameters of the screw have great influence on the plasticization of plastics. In general, plastics with high viscosity and poor fluidity generate heat quickly by friction and are sensitive to temperature and shear, so a screw with a large length-to-diameter ratio and low compression ratio should be selected; in the prior art , the screw homogenization effect of the plastic extruder is not ideal, and the self-heating phenomenon is obvious due to the huge shearing of the shear-sensitive material, which causes the material to overheat during the extrusion process; in addition, the power consumption of the motor during the shearing process of the existing screw is relatively high. Large, material conveying capacity is not ideal
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[0015] The present invention will be further described below in conjunction with the accompanying drawings.
[0016] Such as figure 1 , 2 , 3, 4 It can be seen that in this embodiment, the special screw for the single-screw plastic extruder includes feeding section 1——length is 1065mm, melting section 2——length is 3740mm, metering section 3——length is 1145mm , the main thread 4 is set on the whole process of the screw, and the feeding section 1 is equidistant and equal in depth, that is, the screw root diameter d of the feeding section 1 1 , main thread top diameter D 1 constant, in this embodiment, the screw root diameter d of feeding section 1 1 106mm, main thread top diameter D 1 is 125mm. The lead angle α1 of the main thread 4 of the feeding section 1 is 21°, and the flight width e1 of the feeding section 1 is 15mm.
[0017] The root diameter of the screw increases to d at the beginning of the melting section 2 2 , in this example, d 2 =125mm, the top diameter of t...
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Abstract
The invention provides a special screw for a single-screw plastic extruding machine. The screw has a satisfactory homogenizing effect, is low in power consumption and is strong in material conveying ability. The screw sequentially comprises a charging section, a melting section and a metering section, wherein main threads are arranged on the whole screw; the charging section is equal in distance and constant in depth, and the root diameter of the screw is suddenly increased on a beginning part of the melting section; first auxiliary threads are arranged on the whole melting section, the top diameters of the first auxiliary threads are gradually increased in the top 2/3 course of the melting section and are constant in the last 1/3 course of the melting section; on the tail part of the melting section, the top diameters of the main threads are identical to the top diameters of the first auxiliary threads; three-start screws are arranged in the middle of the metering section, and double-start threads are arranged on the tail part of the metering section.
Description
technical field [0001] The invention relates to a plastic extruder, in particular to an extruder screw. Background technique [0002] Single-screw extruder is an important plastic extrusion molding equipment. The screw is the main part of the extruder, which is related to the application range and production efficiency of the extruder. The structural characteristics and basic parameters of the screw have great influence on the plasticization of plastics. In general, plastics with high viscosity and poor fluidity generate heat quickly by friction and are sensitive to temperature and shear, so a screw with a large length-to-diameter ratio and low compression ratio should be selected; in the prior art , the screw homogenization effect of the plastic extruder is not ideal, and the self-heating phenomenon is obvious due to the huge shearing of the shear-sensitive material, which causes the material to overheat during the extrusion process; in addition, the power consumption of th...
Claims
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IPC IPC(8): B29C47/62
CPCB29C48/52B29C48/53B29C48/535B29C48/655
Inventor 江东华
Owner 安徽汇东机械有限责任公司
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