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10/12

sharing the economic factors of extruder screw design

for any technical problem, it is totally wrong to ignore the economy of design. in some cases, the rationality of screw design must be analyzed more comprehensively, that is, from the perspective of economy.

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10/13

functional characteristics of exhaust screw

in the extrusion process, the gas to be discharged from the raw material includes three parts: the air brought in between the raw material particles; moisture adsorbed on granular materials; gases or liquids contained in raw materials, such as residual monomers, low molecular volatiles and water, etc.

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10/13

determination of screw groove depth and pump ratio of exhaust screw

among the parameters of the exhaust screw, the screw groove depth h1 and h2 are the most important, because these two values directly affect the working state of the exhaust screw

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10/13

parameters of extruder screw exhaust section

the exhaust performance of the exhaust screw of the extruder is mainly determined by the parameters of the exhaust section, and there are many factors that affect the exhaust effect. the simulation device shown in figure 14-2 is used to study the exhaust effect of the exhaust screw of the exhaust extruder. the results show that the length of the exhaust section l, the residence time of the molten material in the exhaust section t, and the shear rate of the molten material in the exhaust section γ, finally, the filling degree of the plastic in the screw groove of the exhaust section (expressed by the filling coefficient f) is directly related to the exhaust effect

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10/13

surface treatment and service life of injection molding machine screw

we have emphasized many times that the screw barrel is the most critical and soul part of the injection molding machine. during the injection molding process, plastic raw materials enter the barrel of the injection molding machine from the tail. the screw rotates in the barrel, extrudes and pushes the plastic particles and their fillers, blends and plasticizes in the advance, and injects the screw head into the mold cavity. at this time, the barrel and screw bear certain high temperature and high pressure of different plastics, and the working temperature of the screw of the injection molding machine is also different.

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10/13

introduction to the principle of ball screw

ball screw has been widely used in all electric servo injection molding machine because of its high mechanical efficiency and high compliance performance. the ball screw is a motion pair that uses the ball as the power transmission interface between the screw and the nut to roll. ball screw is mainly developed for the purpose of machine tool driving device, and its development purpose is to achieve position accuracy and smoothness. ball screws have been successfully used in precision machinery, automation, various power transmission, semiconductor, medical and aerospace industries.

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10/13

boronizing treatment of steel screw barrel surface

screw and barrel are mostly scrapped due to large gap caused by wear, which can not be extruded and injected normally. few of them fail due to insufficient strength. especially, in addition to strength, more consideration should be given to structural commonweal and thermal inertia in the design of barrel, and the wall thickness determined by the latter two factors should be far greater than the calculated value of strength conditions

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10/13

extruder screw design and repair process

the extrusion system consists of screw and barrel, which is the "heart" of extrusion work. the screw completes the continuous conveying, plasticizing, homogenizing, constant pressure and quantitative extrusion of plastics in the barrel. the types of screws are: constant pitch gradual change screw, constant pitch depth abrupt change screw, variable depth variable pitch screw, etc. the structure of constant pitch progressive screw is studied as an example. its main features: the thread pitch of the screw thread is equal, while the depth of the thread groove remains unchanged in the feeding section and homogenizing section, while the depth of the thread groove in the plasticizing section gradually becomes shallow from the depth, which is suitable for extrusion plasticization of various plastics. the progressive screw divides the working length of the screw into three basic functional segments,

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10/13

how to judge the output of extruder screw?

the output is a main index to evaluate the performance of extruder screw. however, it is not significant to only emphasize the percentage increase in the output of the improved screw compared with the original screw, because the benchmark for comparison is not clear. from the theory of fluid dynamics, we know that the output will be greatly improved if the worn screw is replaced by the screw with smaller screw clearance. in order to accurately reflect the performance of the screw, the following four aspects can be compared.

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10/13

share standards for extruder screw performance

extrusion process is a complex process, which involves many factors. facts show that it is one-sided to evaluate the performance of extruder screw only according to the productivity. as we all know, if the colleague with high output has high capacity consumption, the screw is not desirable. for another example, if the extrudate has a high temperature rise at the same time of high output, the cooling burden of the main and auxiliary engines will increase. in fact, such screws cannot be used at high speed, and their performance is not much better than that of ordinary screws at low speed.

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