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Extruder for tackifying preparation of meltable polymers

A technology of extruder, polymer, applied in the field of extruder

Pending Publication Date: 2022-03-01
GNEUSS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It does not indicate that it is used for polymers other than rubber and selectively affects the viscosity of the application

Method used

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  • Extruder for tackifying preparation of meltable polymers
  • Extruder for tackifying preparation of meltable polymers
  • Extruder for tackifying preparation of meltable polymers

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0043] In FIG. 1 , an extruder 100 according to the invention is shown from the outside in a perspective view, wherein end bearings and drive elements are not shown. In particular, the housing 10 is visible with an inner housing recess 18 in which the extruder screw 20 is rotatably mounted. The housing 10 has an inlet region 11 with a feed opening 12 for solid polymer particles. A central region 14 with an enlarged diameter is connected via a connecting flange 13 , which has at least one housing opening 15 extending into an inner housing recess 18 . A suction device, in particular a vacuum pump, is connected to the housing opening 15 .

[0044] A further connecting flange 16 is connected to an end area 17 of the housing 10 , the diameter of which is reduced again and approximately corresponds to the diameter of the initial area 11 . At the end of the end area 17, a housing recess 18, which is designed in particular as a cylindrical hole, opens so that the treated polymer mel...

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PUM

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Abstract

The invention relates to an extruder (100) comprising a housing (10) with an inner housing recess (18) in which an extruder screw (20) with a screw extruder screw thread (32, 33, 34) is rotatably mounted. The outer diameter of the extruder screw (20) is subdivided into an initial diameter region, a central diameter region and an end diameter region, the central diameter region (23) having a larger outer diameter than the other diameter regions and forming a conical transition between the regions of different diameters, and wherein at least one degassing zone (23.2) is formed in the central diameter region (23), the degassing zone has a housing recess from which at least one suction opening (15) extends to the outside of the housing (10). According to the invention, the flow channel formed between the extruder screw shaft core and the inner wall of the inner housing recess (18) is designed as an annular expansion nozzle, the outer diameter of the extruder screw threads (32, 33, 34) being constant and the radial flow channel height increasing.

Description

technical field [0001] The invention relates to an extruder for the viscosity-increased preparation of a meltable polymer having the features of the preamble of claim 1 . Background technique [0002] In plastics technology, extruders are used to plasticize and process polymers. If the goal is only plasticization, many designs are available as single rotor with one extruder screw or as twin rotor with two extruder screws, so the special geometry of the extruder screws results in the plastic It is sucked in the form of solid particles and then melted and ejected in liquid form. In many applications, homogenization and degassing, e.g. removal of moisture contained in solids, are also carried out. The disadvantage here is usually that the high shear stress in the extruder leads to a reduction in the molecular chain length in the polymer and thus to a lower viscosity. These effects occur especially with high viscosity polymers. However, for some applications, the viscosity m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/395B29C48/53B29C48/535
CPCB29C48/53B29C48/535B29C48/397B29B7/429B29B7/428B29B7/845B29C48/52B29C48/767B29B7/86
Inventor S·格诺伊斯D·格诺伊斯
Owner GNEUSS GMBH