Valve Bag and Method and System for Producing a Valve Bag

Patent metadata

Field	Value
Publication number	US-2020122893-A1
Application number	US-201716336775-A
Country	US
Kind code	A1
Filing date	Sep 27, 2017
Priority date	Sep 27, 2016
Publication date	Apr 23, 2020
Grant date	—

Abstract

The invention relates to a valve bag, in particular a cross-bottom valve bag, comprising a first wall and a second wall, which are joined to each other by means of side edges or side folds and by means of bottoms and which delimit a bag interior, comprising a valve, which is arranged in one of the bottoms and via which the bag interior can be filled with a filling material, and comprising venting openings in the first and/or in the second wall for venting the bag interior. At least one channel is provided on the outside of at least one wall, which channel covers the venting openings and is formed at least by two parallel fastening strips and by a cover strip, the cover strip likewise comprising venting openings, and wherein the shortest path between the parallel fastening strips along the cover strip is longer than the shortest path along the at least one wall or the cover strip, and/or the parallel fastening strips consist of stretchable material.

First claim

1 . A valve bag, in particular a cross-bottom valve bag, comprising
a first wall and a second wall, which are joined to each other by means of side edges or side folds and by means of bottoms and which delimit a bag interior, a valve, which is arranged in one of the bottoms and via which the bag interior can be filled with a filling material, venting openings in the first and/or in the second wall for venting the bag interior, characterized in that at least one channel is provided on the outside of at least one wall, said channel covering the venting openings and being formed at least by two parallel fastening strips and by a cover strip, the cover strip likewise comprising venting openings, and wherein the shortest path between the parallel fastening strips along the cover strip is longer than the shortest path along the at least one wall, or the cover strip and/or the parallel fastening strip consist of an expandable material.

2 . The valve bag according to claim 1 ,
characterized in that the shortest path between the parallel fastening strips is at least 3 % longer along the cover strip than the shortest path along the at least one wall.

3 . The valve bag according to claim 1 ,
characterized in that the venting capacity is greater than 5 m 3 /h and particularly greater than 10 m 3 /h.

4 . The valve bag according to claim 1 ,
characterized in that a layer comprising a filter material is provided within the channel.

5 . The valve bag according to claim 1 ,
characterized in that a layer comprising a filter material is provided in the bag interior, wherein the filter material covers the venting holes.

6 . The valve bag according to claim 1 ,
characterized in that the air permeability of the venting openings in the at least one wall is greater than the air permeability of the cover strip.

7 . The valve bag according to claim 1 ,
characterized in that the venting openings in the at least one wall are no more than half a bag length, particularly no more than one-third the bag length, away from the bottom in which the valve is arranged.

8 . The valve bag according to claim 1 ,
characterized in that the venting openings of the cover strip are no more than half a bag length, particularly no more than one-third the bag length, away from the bottom in which no valve is arranged.

9 . The valve bag according to claim 1 ,
characterized in that the valve bottom comprises two bottom flaps, wherein the first bottom flap comprises parts of the cover strip, wherein, when viewed from the exterior, the second bottom flap covers the first bottom flap at least partially.

10 . The valve bag according to claim 1 ,
characterized in that the bottom, which is valve-free, comprises two bottom flaps, wherein the first bottom flap comprises parts of the cover strip, wherein, when viewed from the exterior of the bag, the first bottom flap covers the second bottom flap at least partially.

11 . A method for producing a valve bag according to claim 1 ,
wherein a flat strip is provided a tube with a first and a second wall is formed from the flat strip, the tube is separated into tube parts, a bottom is formed on both ends of each tube piece, wherein venting holes are placed, characterized in that at least one cover strip is created on the first or the second wall, with which the venting holes are covered, wherein the cover strip is equipped with at least one fold extending in the longitudinal direction.

12 . The method according to claim 11 ,
characterized in that the venting holes are placed before a tube is formed from the flat strip.

13 . The method according to claim 10 ,
characterized in that the cover strip is formed from the fiat strip, wherein the cover strip and the flat strip are connected to each other.

14 . The method according to claim 10 ,
characterized in that a filter material is applied to the flat strip and/or to the cover strip and attached therein.

15 . The method according to claim 10 ,
characterized in that p 1 a filter material is applied to the flat strip and/or cover strip and attached therein.

16 . A system for producing a valve bag according to claim 1 ,
comprising a providing device, particularly a roll-off device, for providing a flat strip, tube-forming tools for forming a tube with a first and a second wall from the flat strip, a separating device for separating the tube into tube parts, bottom-forming devices for forming a respective bottom at both ends of each tube piece, at least one perforation or cutting device for placing venting holes, characterized in that a device for creating a cover strip is provided on the first or the second wall, wherein the venting holes can be covered with the cover strip, that a folding device is provided, with which the cover strip can be equipped with at east one fold extending in the longitudinal direction.

Assignees

• Windmoeller & Hoelscher

Inventors

• Lamkemeyer Andreas
• Jung Michael
• Köhn Uwe
• Derksen Jakob
• Kleemann Andreas

Classifications

• B65B43/465

  for bags · CPC title

• B31B70/62

  by adhesives · CPC title

• B65D31/08

  with block bottoms · CPC title

• B65B1/22

  by vibration · CPC title

• B31B2150/001

  with square or cross bottom · CPC title