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Special screw for blow-moulding machine capable of using powder resin

A blow molding machine and screw technology, applied in the field of plastic blow molding machine equipment parts, can solve the problems of low cost, high production cost, high raw material, energy, labor consumption, etc.

Inactive Publication Date: 2011-01-19
NAT ENG AN TECH RES CENT FOR PRESERVATION OF AGRI PROD TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Single-screw extrusion molding equipment Single-screw extrusion molding equipment, the operation process is complicated, the production process is long, the consumption of raw materials, energy and labor is large, and the production cost is high.
However, the production equipment investment required by the single-screw extrusion molding process is much lower than that of the twin-screw extrusion molding process equipment, which is one of the reasons why the two extrusion molding processes of PVC have coexisted for a long time

Method used

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  • Special screw for blow-moulding machine capable of using powder resin
  • Special screw for blow-moulding machine capable of using powder resin

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Effect test

Embodiment Construction

[0012] The special screw for blow molding machine that can use powder resin is a special screw for PVC blown film single-screw extruder that can use powder resin mixture as raw material.

[0013] The working principle of the special screw: the densely-pressed solid bed is in contact with the surface of the heated barrel during the advancement, and the melting starts from the contact part and leaves a layer of melt film on the surface of the barrel. Due to the relative motion of the barrel surface to the screw and the solid bed, a velocity distribution is created within the melt film formed between the barrel and the solid bed. When the thickness of the melt film exceeds the gap between the screw flight and the barrel, the melt will be "scraped" by the screw flight and sent to the propulsion surface of the screw flight to form a melt pool. Still a solid bed. In this way, as the solid bed moves forward along the screw groove, its width gradually decreases, and the width of the ...

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Abstract

The invention relates to a screw specially used in a blow molding machine, which can use powder resin; the screw is made of the material of 38CrMoAl high-quality alloy steel and consists of a feeding section with helixes of unequal distance and depth and the length of 5 to 7 pitches, a compression section with helixes of equal distance and unequal depth and the length of 8 to 10 pitches and a metering section with helixes of equal distance and depth and the length of 10 to 12 pitches; wherein, the outer diameter of an integral screw edge of the screw is in unequal diameter gradual enlargementtype; the size of the outer diameter of a screw edge of the extreme end of the metering section is larger by 1 to 2mm than that of the outer diameter of the most front end of the feeding section . The purpose of producing high-quality PVC blow molding films by directly using a powder resin mixing material as the raw material can be realized by increasing compression ratio, prolonging plasticizingtime, adjusting the rotational speed of the screw, changing technical parameters of the screw such as the length-diameter ratio of the screw and changing performance indexes. A single-screw extrudingmachine of the screw, which can directly adopt the powder resin mixing material as the raw material, is widely used for producing PVC blow molding fruit-vegetable fresh-keeping films.

Description

technical field [0001] The invention belongs to equipment parts of plastic blow molding machines, in particular to a special screw for blow molding machines which can use powder resin. Background technique [0002] When processing polyvinyl chloride (PVC) products, due to the limitation of the characteristics of raw material PVC resin, PVC resin and various processing and modification aids added such as: plasticizer, heat stabilizer, lubricant, filler, The dyes and the like are mixed evenly by heating and mixing to form a mixed powder that can be used for molding. The powder mixture produced at this time is used separately according to the difference of subsequent processing equipment. When twin-screw extrusion equipment is used, due to the high compression ratio and strong plasticizing ability of the equipment, the powder mixture can be directly added to the screw of the twin-screw extruder to directly complete the extrusion molding process; and for single-screw extrusion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C47/60B29C48/535
CPCB29C47/6025B29C48/535
Inventor 李丽秀马骏温桂书王世军张慎元
Owner NAT ENG AN TECH RES CENT FOR PRESERVATION OF AGRI PROD TIANJIN
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