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Stretching device and method for elongating a film web

A technology for stretching films and film strips, which is applied in the field of stretching machines and for stretching film strips, and can solve problems such as unfavorable process technology

Inactive Publication Date: 2014-09-03
WINDMOELLER & HOELSCHER GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the thinning point is squeezed by reintroduction of heat into the always still hot film melt, which must then be cooled again, which is disadvantageous in terms of process technology

Method used

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  • Stretching device and method for elongating a film web
  • Stretching device and method for elongating a film web
  • Stretching device and method for elongating a film web

Examples

Experimental program
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Embodiment Construction

[0022] figure 1 A schematic diagram of the stretching nip 21 is shown, which is bounded by rollers 22 and 23 . The film web 24 moving out of the drawing is first wound around the roller 22, which has a first peripheral speed. The film web 24 then passes through the stretching nip and finally reaches the surface of the roller 23 , which has a peripheral speed greater than the peripheral speed of the roller 22 . Owing to the peripheral speed difference, the film web 24 runs in the stretching nip 21 . exist figure 1 As can be seen in , the width of the film strip 24 shrinks from the width B1 to the width B2 through the stretching process described. The edge regions 27 and 26 of the film strip 24 are shown differently from the central region of the strip 24 in order to indicate the retraction of the film 24 shown below. Figure 2-4 The different film profiles are shown and in this way help to understand the shrinkage process. figure 2 The profile of a new film 24 before stre...

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PUM

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Abstract

A device (30) and a method are described and claimed for stretching a film web (24) along its longitudinal direction (z), in which the film web is guided in a transport direction (z) by a plurality of rollers (22, 23, 31, 32, 33, 36 and 37), and in which the film web is stretched in at least one stretching gap (21) that is bounded by at least two rollers (22, 23, 33 and 36), which are operated at different circumferential speeds. It is considered novel and inventive that the web is provided with a temperature gradient, the direction of which is transverse to the longitudinal axis of the film web.

Description

technical field [0001] The invention relates to a stretching machine and a method for stretching film webs. The film is stretched by this device. Background technique [0002] In this connection, the word stretching refers to stretching or extending the film strip. Different forms of stretching machines are known for this purpose. The stretching machines mentioned in connection with this document are characterized by a plurality of rollers through which the film web to be stretched is guided. The film web is guided here not only by the individual guide rollers but also through the nip. Part of these rollers form a so-called stretch nip. The film web is stretched within these stretching nips by moving the circumferential surfaces of mutually adjoining rollers at an increasing speed in the direction of film transport. Documents DE 10 2009 046 592 A1 and DE 10 2009 046 593 A1 show such devices. It is particularly evident in the device shown there that the stretching takes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/06
CPCB29C55/06B29C2035/0811B29C2035/0822B29C55/18B29C55/12
Inventor M.巴克曼J.林基斯I.吕贝尔克M.布斯曼
Owner WINDMOELLER & HOELSCHER GMBH
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