Container for packaging filling materials and method for processing a web material

Abstract

In a container for packaging filling materials, in particular a bag or pouch made of plastic film, comprising at least one container wall surrounding the filling material, which has at least one front and rear wall, and comprising superposed layers formed in the top region of the container, wherein in the top region of the container predetermined layers are connected over at least one section by means of at least one closure means closing the container, below which a section of the top region located adjacent to the region fitted with the opening has a filling material withdrawal region and that at least one section of a connecting seam is disposed so that it runs around an opening at least in some areas in such a manner that in the top region the multilayer region is separated in a sealing manner from the filling space of the container.

Claims

1. Container for packaging filling materials, in particular a bag or pouch made of plastic film, the plastic film having longitudinal sides, the container having a top region, a base region and a side region and comprising at least one container wall surrounding the filling material, which has at least one front and rear wall, the front and rear wall each having an inner side, wherein in the base region of the container between front and rear wall, two inner layers of an interfolding of a web section of the plastic film, which is folded inwards at least on one side on one of its longitudinal sides, are disposed, wherein a standing base connecting the front and rear wall is formed by the interfolding, and comprising a multilayer region comprising more than two superposed layers formed in the top region of the container, wherein the multilayer region has at least one carrying aid formed as an opening, which opening passes at least partially through the layers in the top region, and comprising seams connecting predetermined layers in the side regions and in the top region, wherein in the top region predetermined layers are connected over at least one section by at least one closure means closing the container, below which in the top region a section of the top region located adjacent to the region fitted with the opening has a filling material withdrawal region, wherein the multi-layer region comprising more than two layers is formed in the section of the top region adjoining the filling material withdrawal region, wherein all the layers in the top region are seamlessly interconnected by a connecting seam formed from a plurality of seam sections running at predetermined angles with respect to one another, and wherein at least one section of the connecting seam is disposed so that it runs around the opening at least in some areas in such a manner that in the top region the multilayer region is separated in a sealing manner from the filling space of the container, wherein the multi-layer region comprising more than two layers in the top region between front and rear wall comprises inner layers of an interfolding of the web sections folded inwards along its longitudinal sides, wherein each inwardly projecting layer of the interfolding in the top region has a lowermost end and is fixed by at least one connecting seam section on the inner side of the front or rear wall in order to be able to ensure undisturbed escape of filling material from the filling space via the withdrawal region, and wherein the lowermost ends of the inner layers are exclusively in the part of the top region adjacent to the withdrawal region additionally connected to one another along with the fixing on a corresponding inner side, whereas each inwardly projecting layer of the interfolding in the withdrawal region of the top region is fixed by means of at least one connecting seam section exclusively on the inner side of the front or rear wall.

2. The container according to claim 1, wherein at least one closure means is disposed along the upper edge regions of the layers to be connected to one another.

3. The container according to claim 1, wherein the closure means is a reclosure for the filling material withdrawal region.

4. The container according to claim 2, wherein the closure means is a closure seam which interconnects predetermined layers in the top region.

5. The container according to claim 4, wherein a predetermined separating line which weakens surface regions of specific layers is associated with the closure seam which closes the filling material withdrawal region in the top region.

6. The container according to claim 4, wherein the connecting seam sealing the opening in the top region is part of the closure seam interconnecting the predetermined layers in the top region.

7. The container according to claim 6, wherein the closure seam has at least one seam section miming at the height of and parallel to the inwardly folded-over or outwardly folded-over ends of certain layers, on which, at least on one side, another, adjoining seam section extending at a predetermined angle in the direction of the upper edge region of the layers of the top region is disposed.

8. The container according to claim 7, wherein the filling material withdrawal region has an outwardly projecting step formed from predetermined surface regions of at least two layers in the top region.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEW OF THE DRAWINGS

(1) Possible exemplary embodiments of the invention, from which further inventive features are obtained are shown in the drawings. In the figures:

(2) FIG. 1: shows a perspective view of a first container for packaging according to the invention;

(3) FIG. 2: shows a perspective view of a second packaging container according to the invention and

(4) FIG. 3: shows a schematic view of a processing method for a web material for producing packaging containers from plastic film.

DETAILED DESCRIPTION OF THE INVENTION

(5) A container for packaging bulk materials is designated by 1, said container having a front wall 2, a rear wall 3 and a standing base 4. The standing base 4 is thereby produced from two inner layers of an interfolding of a tubular web or flat web folded-in on the longitudinal sides in the longitudinal direction so that the base region 5 of the packaging container is accordingly four-layered in the flat state. The container 1 further has a likewise multilayer top region 6 which is also produced by an interfolding on the other longitudinal side of the tubular or flat web used to form the packaging container. In this embodiment, the inner layers 7, 8 of the top region 6 are only interconnected in sections, where the inner layers in the sections not connected to one another are separated from one another in the area of the folded edge. It is also feasible to separate a folded edge interconnecting an inner and outer layer, for example, at least in a piecewise manner. A closure seam 9 is additionally provided in the top region 6, by which means the packaging container is closed in the top region. Part of the closure seam is a connecting seam 10 which separates a multilayer region 11 of the top region from the container interior in such a manner that the multilayer region 11 can be equipped with a carrying aid configured as an opening 12. The connecting seam 10 prevents any escape of filling material via the opening in the different layers of the top region 6. The sections of the closure seam 9 running in the lateral regions 13, 13 on the upper edge regions of the inner layers 7, 8 create a section of the top region which is accessible for filling material between the inner layers. In particular a filling material withdrawal region 14 is formed in the lateral region 13 of the top region 6, which ensures an advantageously simple withdrawal of the filling material accommodated in the filling space of the packaging container 1. The filling material withdrawal region 14 further has a closure means configured as a reclosure 15 for withdrawal of the filling material in portions, over a predetermined section, in particular on the upper edge region of the container between the inner layers 7, 8. The closure parts thereof are likewise connected in a firmly bonded manner via the closure seam 9 to the surface pieces of the inner layers facing the reclosure. In order that the lower ends of the inner layers 7, 8 do not hinder the emptying of the container 1, these are each fixed on the inner sides of the associated front and rear wall with the aid of connecting seam sections 16, 16. No connection of the lower ends to one another is provided in this case. Lateral seams 17, 17 configured as welds are provided for lateral closure of the packaging container 1 usually filled from the side. For increased stability of the standing base 4 the packaging container 1 additionally has corner welds 18, 18 in its base region 5, which interconnect predetermined surface pieces of the standing base 4 to the inner sides of the front and rear wall 2, 3 in the base region 5.

(6) FIG. 2 shows another exemplary embodiment of a container 21 according to the invention, which also has a front wall 22 and a rear wall 23. The front and rear wall are in turn interconnected via a standing base 24 in the base region 25. In the top region 26 two inwardly folded inner layers 27, 28 are disposed at the upper ends of the front and rear wall 23, 24. In this embodiment the inner layers 27, 28 are only formed above a predetermined section in the top region between front and rear wall. The lower ends of the inner layers protruding between front and rear wall are interconnected by means of a closure seam 29 which closes the container 21 in a sealing manner where at the same time, the multilayer region 31 of the top region 26 with the carrying aid configured as opening 32 is separated from the filling space of the packaging container 21 by means of the closure seam 29 which comprises a connecting seam 30. Furthermore, in this exemplary embodiment only one of the lateral regions 33, 33 is accessible for filling material, where the lateral region 33 of the top region 26 also has a filling material withdrawal region 34 for simplified withdrawal of the filling material. In this case, the filling material withdrawal region 34 is only two-layered, where the top region 26 comprises an outwardly projecting step 35 forming parts of the filling material withdrawal region. The step 35 can be formed, for example, in the top region with the aid of sections of non-inwardly folded surface pieces of the front and rear wall. In turn a reclosure 36 sealing the withdrawal region is provided on the upper marginal edge of the filling material withdrawal region 14. The sides of the container 21 are closed by means of side seams 37, 37 and furthermore, the container additionally has corner welds 38, 38 in its base region 25.

(7) FIG. 3 shows a processing method for a web material used to produce packaging containers from plastic film, which in the present case was produced from a tubular web. Alternatively, a flat web can be used instead of a tubular web which then merely needs to be laid together to form the required folded web. The tubular web is folded to form a flat tube 40 with interfoldings 42, 42 inserted inwards along both longitudinal sides 41, 41. The interfoldings 42, 42 form the inner layers 43, 43, 44, 44 in the top and base region of a packaging container to be produced. Initially, on the interfolding 42 forming the subsequent top region of the packaging container, a folded edge connecting the inner layers 43, 44 is separated by means of a separating device 45 so that a folded web 46 open at one point is formed from the flat tube 40. A reclosure 47 is inserted between the non-interconnected inner layers 43, 44 and fastened to the mutually facing surfaces of the inner layers in the upper edge regions by means of a closure seam 48 which at the same time interconnects predetermined sections in the top region of the folded web to form a strand 49 of at least closed tubular sections. Located below the reclosure 47 is the filling material withdrawal region then provided in the subsequent top region of the packaging container to be produced. The closure seam 48 has seam sections configured to be offset parallel to one another which are connected with the aid of sloping seam sections running at predetermined angles to the parallel seam sections. A multilayer region 50 is separated by means of the closure seam 48 from the interior of the tubular section in which an opening 51 penetrating through at least certain layers of the multilayer region 50 is then stamped. In addition, transverse connecting seams 52 are produced transversely to the longitudinal direction of the strand 49 at predetermined distances from one another, where however when preassembling the pouch strand, in each case only one of the lateral seams laterally delimiting the subsequent packaging container is formed. The second lateral seam is only produced after lateral filling of the pouch-shaped tubular section. Parallel to the transverse connecting seams 52 produced, the pouch strand is continuously weakened in a near region to a respective transverse connecting seam and a perforation line 53 is produced. A tubular section filled and closed in a filling plant can then be torn directly from the pouch strand via the perforation line, whereby a lateral opening of the following pouch-shaped tubular section is produced at the same time. In addition, two corner welds 54, 54 are formed in the region of the interfolding forming the subsequent base region on both sides of a transverse connecting seam 52 possibly already produced, which run at a predetermined angle to the longitudinal sides 41, 41 of the strand and the transverse connecting seams 52 produced. The corner welds 54, 54 produced at the same time are thereby formed on directly adjacent tubular web sections. The corresponding preassembled pouch strand is finally rolled up to form a coil 55 destined for further processing in a filling plant. In addition to the filling of the pouch sections of the pouch strand, at least every other lateral seam on the packaging container is made inside the filling plant.