Device and Method for Transferring a Strip of a Web

Patent metadata

Field	Value
Publication number	US-2022205182-A1
Application number	US-202017604121-A
Country	US
Kind code	A1
Filing date	Feb 10, 2020
Priority date	Apr 18, 2019
Publication date	Jun 30, 2022
Grant date	—

Abstract

The invention relates to a device and a method for transferring the tail of a web from a first clothing to a second clothing. It is characterised in that the tail is transferred in a first, short open draw from the first clothing to the second clothing. This enables automatic web transfer requiring significantly less space and with equipment of low complexity.

First claim

1 - 14 . (canceled)

15 . A method for transferring the tail ( 1 ) of a pulp web ( 2 ) from a first clothing ( 14 ) to a second clothing ( 13 ) in a first open draw ( 9 ) in a machine ( 10 ) for production of the pulp web, comprising steps of
moving the tail ( 1 ) onwards with the second clothing ( 13 ) with the tail ( 1 ) being guided on the second clothing ( 13 ) to a second area ( 19 ), carrying the tail ( 1 ) in the second area ( 19 ) between the second clothing ( 13 ) and a third clothing ( 15 ), carrying the tail ( 1 ) and a remaining section of the pulp web ( 2 ) together on the first clothing ( 14 ) through at least one press nip ( 5 ) between a suction press roll ( 4 ) and at least one other roll ( 6 ) to mechanically dewater the tail and the remaining pulp web in the press nip ( 5 ), carrying the tail ( 1 ) onwards on the first clothing ( 14 ) while the remaining pulp web ( 2 ) follows a clothing of the other roll ( 6 ) to a broke area, wherein the second clothing ( 13 ) is a felt, and the third clothing ( 15 ) is a felt or impermeable belt.

16 . The method according to claim 15 , wherein a jet from a pneumatic nozzle ( 8 ) acts upon the first clothing ( 14 ) after the open draw ( 9 ), the jet acting in a cross-machine area of the first clothing ( 14 ), where the tail is carried on the first clothing ( 14 ) before the open draw ( 9 ).

17 . The method according to claim 15 , wherein the tail ( 1 ) is subjected to suction through the first clothing ( 14 ) between the press nip ( 5 ) and the open draw ( 9 ).

18 . The method according to claim 15 , wherein at least the tail ( 1 ) is subjected to suction through the second clothing ( 13 ) after the open draw ( 9 ).

19 . The method according to claim 15 , wherein at least a portion of the tail ( 1 ) is subjected to suction through the second clothing ( 13 ) after the open draw ( 9 ) and before the second area ( 19 ).

20 . The method according to claim 19 , wherein the second clothing ( 13 ) is guided over a suction box ( 12 ) between the open draw ( 9 ) and the second area ( 19 ) and suction is applied to the second clothing ( 13 ) by the suction box ( 12 ).

21 . The method according to claim 18 , wherein suction is applied to the second clothing ( 13 ) indirectly by a suction box ( 12 ) after the open draw ( 9 ).

22 . The method according to claim 21 , wherein
the second clothing ( 13 ) is guided over a roll ( 11 ) after the open draw ( 9 ), the roll ( 11 ) is selected from a grooved roll ( 11 ) with grooves or a perforated roll ( 11 ), and the suction box ( 12 ) applies suction directly to the grooves in the grooved roll ( 11 ) or directly to the perforated roll ( 11 ), thereby indirectly applying suction to the second clothing ( 13 ) by the suction box ( 12 ).

23 . The method according to claim 15 , wherein the tail ( 1 ) cut out of the pulp web ( 2 ) is widened when it has passed through the second area ( 19 ) and the full pulp web is guided through the second area ( 19 ) after widening.

24 . The method according to claim 15 , wherein the pulp web ( 2 ) comprises primarily pulp and has a basis weight of more than 450 g/m 2 .

25 . The method according to claim 15 , wherein the tail ( 1 ) is cut over its entire width across a machine running direction before the open draw ( 9 ).

26 . A machine ( 1 ) for production of a pulp web with a device for transferring a tail ( 1 ) of the pulp web ( 2 ), comprising:
a first clothing ( 14 ) and a second clothing ( 13 ), an open draw ( 9 ) for transferring the tail ( 1 ) from the first clothing ( 14 ) to the second clothing ( 13 ), a roll ( 11 ) for guiding the second clothing ( 13 ) after the open draw ( 9 ), a jet from a pneumatic nozzle ( 8 ) that can be directed onto the first clothing ( 14 ) after the open draw, the jet being disposed in a cross-machine area of the first clothing ( 14 ), and a suction press roll ( 4 ) and at least one press nip ( 5 ) formed between the suction press roll and at least one other roll ( 6 ), wherein the tail ( 1 ) is carried on the first clothing ( 14 ) before the open draw ( 9 ), the tail ( 1 ) and the remaining pulp web ( 2 ) can be carried together on the first clothing ( 14 ) through the at least one press nip ( 5 ), the tail ( 1 ) can be carried onwards on the first clothing ( 14 ) and the remaining pulp web ( 2 ) can be carried onwards on a clothing of the other roll ( 6 ) to a broke area.

27 . The machine according to claim 26 , wherein
the roll ( 11 ) is a grooved roll with grooves or a perforated roll ( 11 ), the second clothing is a felt, and suction can be applied indirectly to the second clothing ( 13 ) after the open draw ( 9 ) at least at a portion of the tail ( 1 ) by a suction box ( 12 ) applying suction directly to the grooves in the grooved roll ( 11 ) or by the suction box ( 12 ) applying suction directly to the perforated roll ( 11 ).

28 . The machine according to claim 26 , wherein
the first clothing ( 14 ) is wrapped around the suction press roll ( 4 ) and the suction press roll ( 4 ) has at least one suction zone for applying suction to the first clothing ( 14 ) in an area after the press nip ( 5 ), and the second clothing ( 13 ) is guided over a suction box ( 12 ) after the open draw ( 9 ) and the suction box ( 12 ) can apply suction to the second clothing ( 13 ) in an area of the tail ( 1 ).

Assignees

• Andritz Ag Maschf

Inventors

• Theussl André
• Klamminger Wolfgang
• Diemat Reinhard

Classifications

• D21F3/04

  Arrangements thereof · CPC title

• D21G9/0063 Primary

  Devices for threading a web tail through a paper-making machine · CPC title

• D21G9/00

  Other accessories for paper-making machines · CPC title

• D21F3/045

  including at least one extended press nip · CPC title

• D21F9/00

  Complete machines for making continuous webs of paper · CPC title