JP2007534569A - Bag with side folds - Google Patents

Abstract

  The present invention relates to a side pleated bag made of a flexible multi-layered sheet whose inner layer is weldable, the bottom pleated bag being closed before or after filling the bag with filling. Side folds (3; 4) folded between the bag walls forming the bag front wall (1) and the bag back wall (2) on the side end, top side end with closure device and on both sides These lateral folds extend from the bottom end toward the top end and end with a spacing below the upper edge (5) of the bag wall (1; 2) The bag walls (1; 2) are welded to the side folds (3; 4) and welded together along the edges of the bag walls in the bag top region without side folds; The upper end area (12) of the side folds (3; 4) is oriented toward the bottom end. And folded back with respect to one bag wall (1; 2) around a folding line (13) extending obliquely inward and downward, and the inner surface of the folded end area (12) is adjacent to the side folds. In the type in which the top edge (17) of the folded end region (12) is closed and welded to the inner surface of the half, the folded end region ( 12) The outer surface of the side fold is adjacent to the folded back end region (12) of the side fold (3; 4), the outer surface of which is welded in a plane with the adjacent bag wall (16). Is also welded to the adjacent bag wall (1; 2) in a plane, and this welded joint (14,15,16) is the folded end region (3; 4) of the side fold (3; 4). 12) The edge (17) is enclosed.

Description

  The present invention relates to a laterally pleated bag comprising a flexible multi-layer sheet having a structure described in the superordinate concept of claim 1 and capable of welding an inner layer.

  In a known bag of this type (German utility model no. 20017182), the end region is folded back and the folded end region is additionally secured to the adjacent side fold half. The outer surface of the side pleat halves are joined along the top edge to produce an improved seal.

The object of the present invention is to further improve the seal at the upper end of the side folds. This problem is solved by a laterally pleated bag having the structure according to the characterizing portion of claim 1. Refer to claims 2 to 4 for other configurations.
Even if no special closure is provided along the upper edge of the side fold, for example by welding or gluing, the upper edge is embedded in the weld joint area after folding the upper end area of the side fold. This ensures that a complete and secure seal is produced at the upper end of the side folds. This is because the weld joint zone forms a complete seal that provides a positive closure of the upper edge of the side fold, regardless of the additional means. At the same time, it is ensured that the upper side of the side folds no longer inadvertently protrude into the filling space by coupling the side fold area with the bag wall, preferably with the bag back wall.

  In the following, embodiments of the invention will be described in detail with reference to the drawings.

  The illustrated side-pleated bag preferably consists of at least two sheets of flexible multilayers made of thermoplastic. The inner layer of this sheet is weldable and consists of a polyolefin such as, for example, polyethylene or polypropylene. The outside may be followed by one or more layers, depending on the properties required, such as, for example, an aluminum sheet that is not weldable by itself but provides high strength and good printability. It may be formed by a metal sheet and / or a polyester layer.

The illustrated bag has a front wall 1, a rear wall 2 matching the front wall 1, and side folds 3, 4 folded between the front wall 1 and the rear wall 2. The pleats 3 and 4 extend from the bottom end (not shown) of the bag toward the top end, and in this case, end with a space below the upper edge 5 of the bag walls 1 and 2. ing. The bag walls 1, 2 are welded to the side pleats 3, 4 and in the bag top region without the side pleats, the longitudinal weld seams 6, 7 on the edge side along the edge of the bag wall. Are welded to each other.
The bottom end is also closed by a transverse weld seam (not shown), which is done before or after filling the bag with the filling.

  The region at the top end of the bag is generally provided with a closure device that can be formed by a welded seam that is applied before or after filling the bag. This closure device may consist of a re-closure device formed in the form of a groove and a key by means of a press closure band in the embodiment shown in FIGS. In detail, the reclosing device 8 comprises two closing bands 9, 10 extending across the width of the bag, one of these closing bands 9, 10 being on the bag front wall 1 and the other on the bag back wall 2. It is fixed by welding or heat sealing. Each of the closing bands 9 and 10 supports a locking member 11, and these locking members 11 can be shifted to an interengaged state by pressing, and the interengaged state is released when pulled appropriately.

  The upper end regions 12 of the side pleats 3 and 4 are folded along a fold edge 13 that extends obliquely downward toward the inside, and in this case, the folding is directed toward the bag front wall 1 or the bag back wall 2. It may be done. The folded end regions 12 of the side folds 3, 4 have a right triangle shape and halves of the side folds 3, 4 respectively facing the folded end region 12; They are joined by welding through a weld seam 14 schematically shown in FIGS. Furthermore, the outer surface of the folded end region 12 passes through the adjacent bag wall (bag back wall 2 in the illustrated embodiment) and a weld seam 15 which is also schematically shown in FIGS. Are welded. Further, the region 16 of the side fold half adjacent to the folded end region 12 of the side folds 3 and 4 is also welded to the adjacent bag wall 2 in a planar shape, so that this welded connection region Encloses the upper edge 17 of the folded end region 12.

  Thereby, the side pleats 3, 4, regardless of whether or not a closing part such as an adhesive closing part is additionally provided along the upper edge 17 on the overlapping outer surface of the side pleats 3, 4. , 4 is guaranteed to be completely sealed.

  In the bag configuration shown in FIGS. 3-5, a reclosing device 18 is provided in the top region of the bag, which is formed as a three-layer closing strip extending across the entire width of the bag. . Both outer layers 19, 20 are welded to the inner surfaces of the adjacent bag walls 1; 2, which is symbolically indicated by welded joints 21, 22. The intermediate layer 23 is made of a synthetic resin or plastic-based material that can be continuously adhered or continuously adhered, and this material is pulled to the intermediate layer 23 by pulling the bag walls 1 and 2 apart. When force is applied, it can be separated into two partial layers by cohesive failure. After removing the filling, the two separated partial layers can be joined together to form one closed intermediate layer 23 by being pressed together. In other respects, the embodiment shown in FIGS. 3-5 corresponds to the bag configuration shown in FIGS.

It is the figure which folded and showed the upper end part area of the bag by this invention. It is sectional drawing which followed the II-II line | wire shown in FIG. It is the figure which showed 1 change Example of the bag similarly to FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. It is sectional drawing similar to FIG. 4 which showed the state by which the re-closure apparatus provided in the top side of the bag was opened.

Claims (4)

  A side pleated bag comprising a flexible multi-layer sheet, the inner layer of which can be welded, wherein the side pleated bag is closed before or after filling the bag with filling; With side folds (3; 4) folded between the bag walls forming the bag front wall (1) and the bag back wall (2) at the top end and both sides with the closure device These lateral folds extend from the bottom end to the top end and end at a distance below the upper edge (5) of the bag wall (1; 2), The walls (1; 2) are welded together along the edges of the bag wall in the bag top region welded to the side folds (3; 4) and without side folds, and the side folds ( 3; 4) The upper end area (12) is oblique toward the bottom end. Folded with respect to one bag wall (1; 2) around a folding line (13) extending downward to the side, the inner surface of the folded end region (12) In the type in which the top edge (17) of the folded end area (12) is closed and welded to the inner surface, the side fold of the folded end area (12) The side fold half region (16) adjacent to the folded end region (12) of the side fold (3; 4) is also welded to the adjacent bag wall in a planar manner, again. It is welded planarly to the adjacent bag wall (1; 2) and this weld joint (14,15,16) is connected to the folded end region (12) of the side fold (3; 4). A bag with side folds, characterized in that it encloses an edge (17).   The bag with side pleats according to claim 1, wherein the end region (12) of the side folds (3; 4) is folded back towards the bag back wall (2).   A reclosing device (8; 18) is provided at the top end of the bag, the reclosing device being spaced above the folded end region (12) of the side fold (3; 4). The bag with side pleats according to claim 1, which extends across the width of the bag.   A three-layer closure strip is provided as a reclosing device (18), the outer layer of the closure strip being welded to the inner surface of the adjacent bag wall and the intermediate layer can be separated into two partial layers by cohesive failure The bag with side pleats according to claim 3, wherein when these partial layers are superposed, they again shift to an adhesively bonded state.

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