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Process and extruder nozzle for producing tubular extruded products

An extruder and nozzle technology used in the production of tubular extruded products

Inactive Publication Date: 2006-09-20
DR－派克Ⅱ有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An ideal product can only be produced if the material is completely homogeneous and the size of the drawing hole is constant; however, this cannot be guaranteed by known prior art solutions

Method used

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  • Process and extruder nozzle for producing tubular extruded products
  • Process and extruder nozzle for producing tubular extruded products
  • Process and extruder nozzle for producing tubular extruded products

Examples

Experimental program
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Embodiment Construction

[0033] As shown in FIG. 1, the extruder nozzle 1 according to the present invention can be used to extrude a single-layer film hose, which can be used as a packaging film. The extruder nozzle 1 comprises two main parts, an outer nozzle part 2 and an inner nozzle core 3 relatively rotatably embedded in the outer nozzle part 2 . In the present example, the outer nozzle part 2 is arranged in a fixed manner and is formed as a substantially rotationally symmetrical element, ie as a cylindrical housing with a vertical longitudinal axis 4 .

[0034] In the present example, the outer nozzle part 2 is axially divided and comprises an upper part 2A, middle parts 2B and 2C, and a lower part 2D, arranged coaxially with respect to the longitudinal axis 4 and connected to each other in a detachable manner by 5 screws. Fixed and centered. The middle part 2B of the outer nozzle part 2 is provided with a radial inlet 6 through which molten thermoplastic such as polyethylene is supplied under ...

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Abstract

This invention relates to a process and an extruder nozzle for extruding tubular products, particularly blown plastic foil hoses (T). This process comprises the steps of feeding a pressurized material into an extruder nozzle through an inlet, and forcing this material flow through a duct formed between an outer and an inner nozzle components, then shaping the tubular product by pressing the material flow through an annular aperture at the duct end. The essence lies in that the material flow entering the extruder nozzle is distributed first by feeding into an annular expansion chamber, the cross-section of which is selected much greater, that of the inlet. When the expansion chamber has been completely filled up by the material whose pressure has become higher than the flow resistance of an homogenizing ring channel having a cross-section narrowed to and connected to the annular expansion chamber then in the homogenizing ring channel the material flow is forced to move in cross direction to the entering direction thereof, and it is homogenized by the relative rotation of surfaces partly delimiting at least the homogenizing ring channel. The material flow is led to a drawing aperture by way of a helical forced movement.

Description

technical field [0001] The invention relates to a method and an extruder nozzle for producing tubular extruded products, in particular blown tubular plastic films (film hoses). Such plastic films can be used, for example, for packaging different products. Background technique [0002] Methods and devices are known in practice for producing blown film hoses from thermoplastic materials using extruder nozzles. Such a nozzle is generally vertically arranged and has a radial inlet for the thermoplastic material connected to the outlet of the generally horizontal extruder screw. In practice, ensuring a continuous and uniform flow of thermoplastic material is a very important issue. Tubular products—primarily film hoses extruded from annular extruder nozzles—are stretched to the desired diameter and wall thickness. In order to provide the air chamber required for blowing, the film hose is guided by two pinch rollers which also apply the force required to remove the product. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A21C3/04B21C23/00B29C47/06B29C47/20B29C47/26B29C47/28B29C47/24A21C11/16B29C35/02B29C48/10B29C48/32B29C48/33B29C48/335B29C48/34
CPCB29C2035/0211B29C47/0057B29C47/065B29C35/0255B29C47/28B29C47/86A21C11/16B29C47/025B29L2023/001B29C47/24B29L2009/00B29C47/268B29C47/0023B29C47/26B29C47/0026B29C48/865B29C48/09B29C48/10B29C48/0018B29C48/154B29C48/21B29C48/33B29C48/335B29C48/338B29C48/86B29C48/34
Inventor A·普尔茨T·伊莱什L·绍博
Owner DR－派克Ⅱ有限公司
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