Screws used in twin-screw foaming extruder

An extruder and twin-screw technology, which is applied in the field of extruder production, can solve the problems of insufficient foaming of materials, uneven thickness of plates, uneven distribution, etc., and achieve the goal of less yellowing, stable and uniform dispersion, and improved quality Effect

Inactive Publication Date: 2012-06-13
浙江华业塑料机械股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the screw cannot ensure that the material is mixed with the foaming agent under the conditions of stable pressure and temperature, the foaming of the material is not sufficient, the distribution is uneven, and there are black spots, resulting in uneven thickness of the produced board. The quality is not good, so this utility model needs to be further improved

Method used

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  • Screws used in twin-screw foaming extruder
  • Screws used in twin-screw foaming extruder
  • Screws used in twin-screw foaming extruder

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1 to Figure 5 As shown, the screw used in the twin-screw foaming extruder of this embodiment includes a screw body 1, and the screw body 1 is sequentially composed of a feeding section A, a compression section B, a plasticizing section C, an exhaust section E, Composed of mixing section F and extrusion section G, the feeding section A, compression section B, plasticizing section C, exhaust section E, and extrusion section G are all provided with screw edges, and the long diameter of the screw body 1 The ratio is L:D=29, and the circumferential surface of the mixing section F is provided with two screw rods meshing with each other and a plurality of obliquely arranged screw ribs 2, when the screw ribs 2 are unfolded, they are aligned with the axis of the screw body 1. The angle a formed by the core line 11 is 20°.

[0022]...

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Abstract

The invention discloses screws used in a twin-screw foaming extruder. Each screw comprises a screw body, wherein the screw body is sequentially composed of a feeding segment, a compressing segment, a plasticizing segment, a gas discharging segment, a mixing segment and an extrusion segment; spiral edges are arranged on the feeding segment, the compressing segment, the plasticizing segment, the gas discharging segment and the extrusion segment; and the length-diameter ratio of the screw body is L:D = 29. Each screw is characterized in that multiple inclined spiral edge strips are arranged on the circumference of the mixing segment, the inclined spiral edge strips of two screws are mutually meshed, and the included angle between the extended spiral edge strips and the axial center line of the screw body is 19.5-20.5 degrees. As compared with the prior art, the screws have the advantages that multiple inclined spiral edge strips are arranged on the circumference of the mixing segment of each screw and the inclined spiral edge strips of the two screws are mutually meshed, thus the materials are efficiently and uniformly mixed, the materials can be better mixed with a foaming agent, the produced product is not easy to yellow and uniform in thickness, the production formula cost is reduced and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of extruder manufacture, in particular to a screw used in a twin-screw foaming extruder. Background technique [0002] The screw is one of the core parts of the extrusion equipment. The main function of the foaming screw is to convert PVC powder into stable and uniform PVC through the steps of transportation, compression, compaction and plasticization, exhaust, homogenization and metering, and foaming. The plastic melt with evenly dispersed agent is output to the mold head foaming and auxiliary equipment to produce foaming products that meet the requirements. At present, the simple foaming flat twin extrusion screw is gradually being eliminated. In order to improve the plasticizing and stable homogenization ability and good foaming effect, a new type of screw with main structure has been developed in the field of extrusion: the pin edge at the discharge end of the extrusion section and the design of multi-h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/62
CPCB29C48/565B29C48/575B29C48/40B29C48/60
Inventor 魏军伟夏增富邵其艇
Owner 浙江华业塑料机械股份有限公司
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