Device and method for generating a negative pressure in a film machine

Patent metadata

Field	Value
Publication number	US-11141891-B2
Application number	US-201615747035-A
Country	US
Kind code	B2
Filing date	May 10, 2016
Priority date	Jul 24, 2015
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

The present invention relates to a device (10) for the generation of a negative pressure for stabilizing a melt strip (200) in the area of a transport device (120) of a film machine (100) particularly with a production process of a plastic film (230) comprising:at least one main chamber (20) for generating a first negative pressure in a first influence area (310)at least one auxiliary chamber (30) for generating a second negative pressure in a second influence area (320), whereinthe first influence area (310) is assignable to at least one main area (210) of the melt strip (200) and the second influence area (320) is assignable to at least one edge area (220) of the melt strip (200) adjacent to the main area (210), and wherein the first negative pressure differs from the second negative pressure in order to effect a stabilization of the melt strip (200).

First claim

The invention claimed is:

1. A device for the generation of a negative pressure for stabilizing a melt strip in the area of a transport of a film machine comprising:
at least one main chamber for generating a first negative pressure in a first influence area, and
at least one auxiliary chamber for generating a second negative pressure in a second influence area, wherein
the first influence area is assignable to at least one main area of the melt strip and the second influence area is assignable to at least one edge area of the melt strip adjacent to the main area, and
wherein
the first negative pressure differs from the second negative pressure in order to effect a stabilization of the melt strip,
at least the first negative pressure or the second negative pressure are at least automatically or controllably varied,
extensions of the at least one auxiliary chamber in a width direction are configured in such a way that the second influence area of the auxiliary chamber amounts to between 2% to 10% of a whole influence area of the device or of the first influence area of the main chamber, and
at least a sealing element or a wall are configured adjustably for the separation of the main chamber from the auxiliary chamber, wherein the sealing element comprises a curved form adjusted to the transport at the side facing the melt strip.

2. The device according to claim 1 , wherein the main chamber is separated fluidically from the auxiliary chamber.

3. The device according to claim 1 , wherein at least the main chamber or the auxiliary chamber are configured and arrangeable to the transport of the film machine such that the melt strip is suckable to the transport of the film machine.

4. The device according to claim 1 , wherein the auxiliary chamber is configured and arrangeable to the transport of the film machine such that the stabilization of the edge area is performable.

5. The device according to claim 1 , wherein the device comprises a width extension in the width direction which is adjustable to a width of an outlet device of the film machine, wherein the main chamber and the at least one auxiliary chamber are adjacently arranged in the width direction.

6. The device according to claim 1 , wherein an adjusting mechanism is provided wherein the main chamber and the auxiliary chamber are variably adjustable in their size in the width direction.

7. The device according to claim 1 , wherein at least two auxiliary chambers are provided which are arranged in an outer lateral area of the device in the width direction, wherein between the auxiliary chambers the main chamber is arranged.

8. The device according to claim 1 , wherein at least one sealing element is configured continuously or stepwise adjustable in the width direction in order to variably separate the respective influence areas between the main chamber and the auxiliary chamber.

9. The device according to claim 1 , wherein the sealing element comprises a defined distance to the transport.

10. The device according to claim 1 , wherein the sealing element is configured adjustably such that a distance is variable between the sealing element and the transport.

11. The device according to claim 1 , wherein the sealing element is configured at least flexible or elastically deformable in order to adjust to the transport.

12. The device according to claim 1 , wherein the sealing element contacts to the transport.

13. The device according to claim 1 , wherein at least one flow generator is provided for the negative pressure generation at least in the first influence area or in the second influence area.

14. The device according to claim 13 , wherein at least one pressure setter is provided for the alteration of negative pressure for at least the main area or the edge area, wherein preferably only one flow generator is provided for the generation of negative pressure in the first influence area and in the second influence area.

15. The device according to claim 13 , wherein at least one flow generator for the controlled variation of the first and/or second negative pressure is electrically or wirelessly connected to a control device.

16. The device according to claim 1 , wherein at least one first air-conveying duct element for the flow connection with a first flow device is arranged at a main chamber passage and at least a second air-conveying duct element for the flow connection with a second flow device is arranged at an auxiliary chamber passage spaced apart from the main chamber passage.

17. The device according to claim 1 , wherein at least one sensor is provided at least within the main chamber or auxiliary chamber in order to detect the pressure for the main area or edge area.

18. The device according to claim 1 , wherein a further second main chamber is provided.

19. The device according to claim 18 , wherein the second main chamber is arrangeable in relation to the main chamber more spaced apart to the melt strip in order to remove air at the transport.

20. A film machine for the production of a plastic film, wherein the film machine comprises a transport for transporting film material and an outlet device, wherein the film material is guidable out of the outlet device in form of a melt strip through the transport wherein
at least one main chamber is provided for the generation of a first negative pressure in a first influence area and at least one auxiliary chamber for the generation of a second negative pressure in a second influence area wherein the first influence area is assignable to at least one main area of the melt strip and the second influence area to at least one edge area of the melt strip adjacent to the main area and wherein the first negative pressure differs from the second negative pressure in order to effect a stabilization of the melt strip, and
wherein
at least the first negative pressure or the second negative pressure are at least automatically or controllably varied,
extensions of the at least one auxiliary chamber in a width direction are configured in such a way that the second influence area of the auxiliary chamber amounts to between 2% to 10% of a whole influence area or of the first influence area of the main chamber, and
at least a sealing element or a wall are configured adjustably for the separation of the main chamber from the auxiliary chamber, wherein the sealing element comprises a curved form adjusted to the transport at the side facing the melt strip.

21. The film machine according to claim 20 , wherein
a device is provided for the generation of a negative pressure for stabilizing a melt strip in the area of a transport of the film machine, the device comprising:
at least one main chamber for generating a first negative pressure in a first influence area, and
at least one auxiliary chamber for generating a second negative pressure in a second influence area, wherein
the first influence area is assignable to at least one main area of the melt strip and the second influence area is assignable to at least one edge area of the melt strip adjacent to the main area, and wherein
the first negative pressure differs from the second negative pressure in order to effect a stabilization of the melt strip.

22. A device for the generation of a negative pressure for stabilizing a melt strip in the area of a transport of a film machine comprising:
at least one main chamber for generating a first negative pressure in a first influence area, and
at least one auxiliary chamber for generatin

Assignees

• Windmoeller & Hoelscher

Inventors

• Schmitz Torsten

Classifications

• B29C48/916

  using vacuum · CPC title

• B29C48/914

  Cooling drums · CPC title

• B29C48/92

  Measuring, controlling or regulating · CPC title

• B29C41/28

  by depositing flowable material on an endless belt · CPC title

• B29C41/52

  Measuring, controlling or regulating · CPC title