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Extruders for degassing and filtering plastic melts

A melt and filter technology, applied in the field of devices for extruding thermoplastic materials, can solve the problems of device pressure fluctuations, the same quality of plastics that cannot be degassed and purified, etc., and achieves the effect of improving degassing effect.

Active Publication Date: 2011-11-30
EREMA ENG RECYCLING MASCH & ANLAGEN GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These vapors can be carriers of dirt, which enter the degassing section next to the filter and recontaminate the already filtered plastic, so that the same quality of the degassed and purified plastic cannot be guaranteed
In addition, pressure fluctuations in the device can occur due to excessive degassing, e.g. due to moisture in the plastic

Method used

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  • Extruders for degassing and filtering plastic melts
  • Extruders for degassing and filtering plastic melts

Examples

Experimental program
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Effect test

Embodiment Construction

[0011] The device for extruding thermoplastic materials comprises an extrusion screw 2 mounted in a housing 1 , which has an inlet-side plasticizing section P and a degassing section E upstream of the outlet section A. Between the plasticizing section P and the degassing section E, a counter-conveying flight 3 and a flow channel 5 bridging the counter-conveying course 3 and containing a melt filter 4 are provided. In order to prevent the gas generated in the plasticizing section from overflowing directly into the degassing section, the extrusion screw 2 is formed in the same direction between the reverse conveying screw 3 and the outlet 6 in the degassing section E on the discharge side of the flow channel 5 The conveying screw 7, and the shell 1 is provided with a degassing hole 8 in the transitional part between the reverse and the same direction conveying screw 3, 7, through which the gas and dirt squeezed into the conveying screw part from the device 1 The medium is advant...

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Abstract

The invention relates to a device for extruding thermoplastic materials, which has an extrusion screw (2) supported inside a casing (1), which includes a plasticizing section (P) on the input side, a discharge section (P) in front of The degassing section (E) of A) and the reverse conveying screw (3) between the plasticizing section (P) and the degassing section (E) also have at least one bridging reverse conveying screw (3) containing molten material. The flow channel (5) of the material filter (4). In order to achieve favorable product properties, it is proposed that the extrusion screw (2) forms a co-directing conveying screw (7) between the counter-conveying screw (3) and the outlet (6) on the discharge side of the flow channel (5), and The housing (1) has at least one degassing hole (8) in the transition between the counter-current and co-direction conveying screws (3, 7).

Description

technical field [0001] The invention relates to a device for extruding thermoplastic materials, with an extrusion screw supported in a housing, which comprises a plasticizing section on the input side, a degassing section preceding the discharge section, and a degassing section between the plasticizing section and the degassing section. The reverse feed flight between the gas sections also has at least one flow channel which bridges the reverse feed flight and contains a melt filter. Background technique [0002] Plastics, especially waste plastics, must be degassed or cleaned before further processing, so that the plastics are properly degassed and processed. When processing plastic from production waste or plastic material already in circulation, the need arises due to pressurization, painting or soiling to decontaminate this plastic before re-use. For this purpose (WO 93 / 04841 A1) it is known (WO 93 / 04841 A1) to melt the plastic to be processed in an extruder, press it t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C47/60B29C47/68B29C47/76B29C48/03B29C48/55B29C48/69B29C48/693B29C48/74B29C48/76
CPCB29C47/767B29C47/6037B29C47/0009B29C47/74B29C47/686B29C47/0871B29C47/68B29C47/0825B29C48/03B29C48/2564B29C48/268B29C48/55B29C48/69B29C48/693B29C48/74B29C48/767B29B7/845B29B7/58B29B7/429
Inventor H·舒尔茨
Owner EREMA ENG RECYCLING MASCH & ANLAGEN GMBH
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