EP2061707A1

EP2061707A1 - Block-bottom bag

Info

Publication number: EP2061707A1
Application number: EP07786345A
Authority: EP
Inventors: Armin Meyer
Original assignee: Lemo Maschinenbau GmbH
Current assignee: Lemo Maschinenbau GmbH
Priority date: 2006-09-16
Filing date: 2007-07-26
Publication date: 2009-05-27
Also published as: WO2008031476A1; DE102006043576B3

Abstract

The invention relates to a block-bottom bag (1, 1'), comprising at least one front wall (2) and one rear wall (3) which are welded to one another on their longitudinal sides (4, 5), and a bottom (18) which forms a bottom fold (7) in the folded state of the bag (1, 1'), which bottom fold (7) extends over the entire width of the bottom (18) and protrudes into the bag interior, wherein the two side-wall sections (8, 9) which are folded in to form the bottom fold (7) are divided from one another by an inner folding line (10) and from the respective side wall (2, 3) by in each case one outer folding line (11, 12) which is parallel to the inner folding line (10), and, in order to form the block bottom (18), the bag (1, 1') has welds (13, 14, 15, 16) which run obliquely with respect to the folding lines (10, 11, 12) and extend from the outer folding lines (11, 12) towards the longitudinal sides (4, 5), wherein the welds (13, 14, 15, 16) extend parallel to the longitudinal sides (4, 5) at least in regions.

Description

DESCRIPTION

Block bottom bags

The invention relates to a block bottom bag consisting of a front wall and a rear wall which are welded together at their longitudinal sides, a bottom which forms a bottom fold in the folded state of the bag, which extends over the entire width of the bottom and projects into the bag interior, wherein the both side panel sections folded to form the bottom fold are spaced from each other by an inner fold line and from the respective side wall by an outer fold line parallel to the inner fold line, and the bag to form the block bottom has oblique welds to the fold lines extending from the outer fold lines to the outer fold lines Long sides extend.

A block bottom bag is preferably used where goods such as breads are packed. Block bottom bags, which are also called block bottom bags, are preferably made from thermoplastic plastic films. Conceivable here is the production of a transparent and / or colored and / or metallized thermoplastic film. Such a bag is usually made of a folded plastic film web, wherein the individual bags are separated by means of a Trennschweißens. To form the block bottom, the folded plastic film web is folded at its closed end to form a bottom fold. After folding, the lower right and left corner is then welded in the folded area in the area of the bottom fold in the folded area, so that after the welding of the longitudinal sides of the resultant from the bottom fold block bottom is formed.

A block bottom bag designated as a block bottom bag is described in German Utility Model DE 76 05 204. In this generic state of the art, a bag is described, the bottom of the collapsed Condition of the bag forms a fold which extends over the entire width of the bottom and which projects into the bag interior. The welds on the long sides of the bag form with the Abschweißungen in the bottom fold a writable as a Y-shape weld. A problem that arises with such bags is that the bags must be made aroma and water proof. The problem here is always the filling process, in which the bag is very heavily stressed by the filled goods, especially in the welds.

Another bag is described in DE 295 13 879 U1. This bag also has a bottom fold which is provided to form a floor with Abschweißungen. The Abschweißungen extend only over a small part of the bag width and are executed in a straight line. At this weld, the main wall is welded to the adjoining wall of the bottom fold in two layers and forms a boundary line running at about 45 ° to the side edge. Also in this case, the problem arises, the very high loads during filling or transport process.

A bag with reinforcing welds in the region of the bag bottom is known from DE 19 34 749 A1. It is known to combine side welds with short reinforcing welds in the area of the inner bottom fold.

Object of the present invention is to provide a block bottom bag that overcomes the disadvantages of the prior art and ensures high tightness during filling and transport, as well as storage and beyond the cost to manufacture and structurally simple design.

The solution of the problem is inventively provided in that the Abschweißungen extend at least partially parallel to the longitudinal sides of the block bottom bag. Due to the inventive design of the Abschweißungen in the area of the bottom fold, now is the possible created a high tightness during the most stressful phases of the bag to ensure. In this case, the bag is inexpensive and can be produced with minimal design effort only by the conversion of the welding tools. By parallel welding to the longitudinal sides, there is a much more stable formation of the block bottom bag in the block bottom, whereby a high tightness is ensured during use of the bag. Especially in the transition from the 4-ply into the 2-ply region, the static load is the strongest and at these points leads very quickly to a tear or a hole formation occurs. Due to the formation of the partially parallel to the longitudinal sides Abschweißungen the force is much better distributed to the transition region from 4-ply to 2-ply, creating much more stable block bottom bag can be produced.

The invention will be explained in more detail with reference to an embodiment. It shows:

FIG. 1 is a plan view of a folded block bottom bag;

FIG. 2 shows a side view in the direction of the arrow P from FIG. 2,

FIG. 3 shows a basic shape of a welding tool for

Generation of a weld in the region of the bottom seam according to the prior art and

FIG. 4 shows a welding tool for producing a device according to the invention

Welding in the bottom fold area.

1 shows a plan view of an inventively designed block bottom bag 1 with a front wall 2 and a formed with respect to the front wall 2 longer rear wall 3. The front wall 2 and the rear wall 3 are welded together at their longitudinal sides 4, 5. Between the front wall 2 and the rear wall 3, a filling opening 6 is provided, through which Goods in the block bottom bag 1 can be filled. The block bottom bag 1 is made of a folded plastic film web which is folded to form a bottom fold 7 at its lower end, wherein side wall sections 8, 9 are folded inwardly. The side wall sections 8, 9 are bounded by an inner fold line 10 and the outer fold lines 11, 12.

As shown and in particular better seen in Figure 2, the block bottom bag 1 in the bottom fold 7 to the outer fold lines 11, 12 is formed 4-ply. By contrast, only the front wall 2 and the rear wall 3 rest against one another above the bottom fold 7, so that the block bottom bag 1 is present in this area and in the folded state in two layers. In the transition region 13, 14 between 4-ply and 2-ply region of the block bottom bag 1 occur when filling the block bottom bag 1 very large loads that often lead to the block bottom bag 1 in the transition region 13, 14 is leaking, which in turn has the disadvantage brings that when perishable goods are filled, they can, for example, mold or absorb moisture. This disadvantage is remedied by the embodiments of the invention of the course of Abschweißungen 13, 14, 15, 16. The Abschweißungen 15, 16 extend from the outer fold line 11, 12 at an angle of nearly 45 ° in the direction of the longitudinal sides 4, 5 and in an upper portion 13, 14 parallel to the longitudinal sides 4, 5 and at the same time parallel to the welds the long sides 4, 5.

The inventive design of the Abschweißungen 13, 14, 15, 16 in a direction oblique to the fold lines region 15, 16 and a parallel to the longitudinal sides 4, 5 extending portion 13, 14 is a distribution of the goods in the block bottom bag introduced force generated in the transition region 13, 14 distributed over the entire transition region 13, 14. As a result, the tightness in the transition region 13, 14 is ensured even at high loads when filling the goods in the bag 1.

As described in the introduction, a plastic film web is folded, so that a pretext 2 and a rear wall 3 is formed, wherein in this embodiment the rear wall 3 is formed longer, and is provided with recesses 17, so that the bag formed 1 can be suspended or torn off presented to the end user or positionally positionable in a machine. The folded plastic film web is folded again to form the bottom fold 7, so that the bottom fold 7 forms from the side edge sections 8, 9. Thereafter, the side wall portion 8 and the front wall 2 as the Seitenwand- section 9 with the rear wall 3 by means of Abschweißungen 13, 14, 15, 16 are welded together to form the block bottom 18. In a next step, then follows the separation welding to form separate block bottom bag 1 and the longitudinal seams on the long sides 4, 5.

In the figure 4, the folded plastic film web 19 is shown with a folded bottom fold 7 partially in a plan view. The plastic film web is intermittently conveyed in the direction of the arrow F by the machine for producing the block bottom bags. The section shown in Figure 4 shows the basic arrangement of the welding bar 20, to form the Abschweißung 13, 14, 15, 16. The welding bar 20 welded by welding two Abschweißungen 13, 15 and 14, 16 for a block bottom bag 1 and another Block bottom bag 1 '. The course of the dotted line 21 indicates the position in which the longitudinal seam cutting takes place to form the longitudinal sides 4, 5 of the block bottom bag 1, 1 '. The approximately right-angled welding strips 22, 23 of the welding bar 20 weld the bag bottom to form the welds 15, 16. The rectilinear region 24 of the welding bar 20 extends over a length a of approximately 10 mm. Shown is merely a profile of a welding bar 20, which has the shape of a Y, wherein the welding is executed as a pure welding or combined cutting and welding. When separated by welding, the approximately right-angled corner 25 would be cut out of the side wall sections 8, 9 and the side walls 2, 3.

FIG. 3 shows a welding bar 26 as is known for producing the block bottom bags known from the prior art.

Claims

Patent claims

1. block bottom bag consisting of at least a front wall (2) and a rear wall (3), which are welded together at their longitudinal sides (4, 5), a bottom (18) in the collapsed state of the bag (1, 1 ') a bottom fold (7) which extends over the entire width of the bottom (18) and projects into the bag interior, wherein the two folded to form the bottom fold (7) side wall sections (8, 9) from each other by an inner fold line (10) and separated from the respective side wall (2, 3) by a respective outer fold line (11, 12) parallel to the inner fold line (10), and the bag (1, 1 ') forming the block bottom (18) to the fold lines (FIG. 10, 11, 12) has obliquely extending abutments (13, 14, 15, 16) which extend from the outer fold lines (11, 12) to the longitudinal sides (4, 5), characterized in that the welds off (13, 14, 15, 16) at least partially parallel to the longitudinal sides (4, 5) erstre CKEN.

2. block bottom bag according to claim 1, characterized in that the longitudinal sides (4, 5) parallel course of Abschweißung (13, 14) over a length (a) of about 10 mm.

3. block bottom bag according to one of claims 1 and 2, characterized in that in each case over the Abschweißung (15, 16) protruding corner (25) of the side walls (2, 3) and bottom fold (8, 9) is separated.