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Device for polishing and cooling plastic tapes from gas nozzles

A plastic belt and slot technology, applied in the field of plastic belts, can solve the problems of inapplicability to manufacture plastic films with high transparency, good cooling effect, inapplicability, etc., and achieve good calendering effect, outstanding cooling effect, and good film characteristics. Effect

Inactive Publication Date: 2006-02-01
REIFENHAUSER GMBH & CO MASCHFAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since especially the cooling effect of such known devices is disadvantageous, this device is not suitable for the production of plastic films with high transparency
Therefore this known device has proved to be unsuitable

Method used

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  • Device for polishing and cooling plastic tapes from gas nozzles
  • Device for polishing and cooling plastic tapes from gas nozzles
  • Device for polishing and cooling plastic tapes from gas nozzles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] figure 1 A device known from the prior art is shown in . In this case, the plastic strip 2 emerging from the slot nozzle 1 is guided through a calendering device 3 . The calendering unit 3 comprises a chilled calender roll 5 and an endless belt 4'. The endless belt 4 ′ rests against the plastic belt 2 along a part of the circumference of the calender roll 5 . To cool the endless belt 4 ′ or the plastic belt 2 , the endless belt 4 ′ is guided by cooling rollers 13 , 14 . Furthermore, the plastic strip 2 emerging from the calendering nip and the cooling nip between the calendering roll 5 and the endless belt 4' embraces the calendering roll 5 and is then guided through another calendering nip where it passes through the calendering roll 5 Formed between another cooling calender roll 15.

[0021] The cooling effect achieved with known devices is not entirely satisfactory. The endless belt 4 ′ is first cooled on cooling rollers 13 before it comes into contact with the ...

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Abstract

An apparatus for smoothing and cooling of slit nozzle synthetic web passes the web following the smoothing gap between two rollers along a cooled surface and into contact with cold air introduced by cold air chamber open toward the roller surface.

Description

technical field [0001] The invention relates to a device for calendering and cooling plastic strips which are discharged from slot nozzles. Within the scope of the present invention, a plastic web refers not only to the still plasticized web discharged from the slot nozzle but also to the plastic film formed therefrom. Background technique [0002] Calendered plastic strips produced with the device described at the outset are mainly used in the packaging industry. A high transparency is best for such plastic films. This transparency depends on the relationship between the crystallization rate and the cooling rate. High cooling rates generally result in plastic films with higher transparency. It is therefore preferable to cool the plastic strip as quickly and as strongly as possible. [0003] In a device known in practice, the plastic strip discharged from the slit nozzle is guided through a calendering and cooling gap, which is bounded on the one hand by a cooled calende...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C59/04B29C48/05B29C48/08B29C48/90
CPCB29C47/8875B29C47/90B29C47/0021B29C47/904B29C48/05B29C48/08B29C48/914B29C48/917B29C48/918B29C48/90B29C48/904
Inventor 赫尔穆特·迈尔
Owner REIFENHAUSER GMBH & CO MASCHFAB
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