JP2001348040A - Formed foil bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foil bag which has an appearance with curved sides in a filled state through the manufacturing cost and time is suppressed. SOLUTION: The foil bag comprises two side foils which are coupled with each other via each connection surface on at least two opposite side rims and a base foil inserted between the side foils. In this case, at least one of the connection surfaces (2) of the two side rims of the foil bag has an expansion (3) in a region (Z), and a distance (B) between the connection surfaces (2) of the two opposite side rims of the side foils (5) is shortened in the region (Z).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises two side foils connected at least at two opposite side edges via respective connecting surfaces, and a bottom foil inserted between the side foils. Related to foil bags.

[0002]

The known foil bag consists of two rectangular side foils which are welded or glued together at two opposite edges. A bottom foil is welded or glued between the side foils at a third edge forming the bottom of the bag. Thus, after the bottom foil has been unfolded, the foil bag has an expanse that provides space for fillings such as liquids. After the filling operation, the foil bag is welded to close the fourth edge or upper part. The production of this foil bag is disclosed, for example, in German Patent Application No. 19825080.

[0003]

In order to make the appearance of the side of the foil bag similar to that of the bottle and to make it easier to hold the foil bag, German Design No. 97047
A constricted foil bag has been proposed, as disclosed in US Pat. In this foil bag, the welding surface to which the side foils are welded or glued together has a curved profile that forms a waist in the center of the bag.
To that end, a corresponding part is stamped from each side foil. Therefore, additional manufacturing steps are required,
A corresponding foil waste occurs.

The present invention has been made in view of the above circumstances, and provides a foil bag having a laterally curved appearance in a filled state, despite the reduced manufacturing cost and manufacturing time. The purpose is to do.

[0005]

In order to achieve the above-mentioned object, the present invention comprises two side foils connected to each other at least at two opposite side edges via respective connecting surfaces.
A bottom foil inserted between the side foils, wherein at least one of the connecting surfaces of the two side edges of the foil bag has an extension in an area, and The distance between the connecting surfaces of the two opposing side edges is reduced in the area.

The foil bag of the present invention has, in the center, an area in which at least one connecting surface of the two side edges of the bag has an expanded portion, and the distance between the connecting surfaces of both side edges of the side foil is reduced. The area is shortened.

In the unfilled state, the two side foils are directly overlapping and the foil bag has a substantially rectangular appearance. During the manufacturing process, the two-sided foils are cut from the foil material by being cut straight at the connection. No material is discarded in this area.

When the foil bag is unfilled after the side foil and the bottom foil have been welded together, the empty foil bag is substantially rectangular and is easy to pack, store and handle. The foil bag of the present invention, when unfilled, has properties similar to a rectangular bag.

[0009] However, when the foil bag is filled, the portion of the connection surface where there is an expansion contracts due to its small cross-sectional area. This creates a waist that gives the foil bag a curved side appearance and also serves as a concave grip.

Thus, a constricted shape can be obtained in the filled state without performing additional punching work on the side foil.

The advantage of the foil bag according to the invention arises even if the corresponding extension is only on one of the connecting surfaces of the side edges of the foil bag. Preferably, however, corresponding extensions are provided on both sides, so that the appearance of the foil bag is symmetrical.

The side foils can be connected to one another at the connection surface in various ways. The bonding operation using heat fusion, welding, or an adhesive is simple and safe.

[0013] The foil bag may be of any desired shape in the area outside of the area containing the expanded side edges. For this purpose, the side foils must be appropriately shaped.

[0014] If the side foil is completely rectangular, there is no waste in the area outside the area containing the expanded connecting surface, and the manufacturing cost can be reduced.

To approximate the appearance of the filled foil bag to that of the bottle, the side foils may be shaped so that the connected side edges converge with each other at the top of the foil bag.

The foil bag may be designed so that the top is closed directly by welding the two side foils together after the filling operation. In addition, the filling capacity can be increased by providing a top foil for increasing the filling capacity in an expanded state like a bottom foil at the top of the foil bag.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a foil bag according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a side view of the foil bag 1 according to the present invention in an unfilled state. One side foil 5 is shown. The side foil 5 is connected to a second side foil (not shown) at the left and right welding seams 2. At the center of the foil bag, an extension 3 is provided at the left and right weld seam 2. The extended portions 3 on both sides are set to a distance B by shortening the distance between the opposed welding seams 2. In the portion without the extension 3, the distance between the opposing weld seams 2 is the distance A. In the bottom part of the bag, the folded bottom foil 4 is welded between the side foils 5.

Reference numeral 6 denotes the outer edge of each welding seam 2. This outer edge is substantially straight in the area Z of the extension 3.

The side foil material may be a single layer material or a composite material such as a laminated aluminum foil.

FIG. 2 shows the foil bag in a filled state. The bottom foil 4 is opened by filling,
There is space for filling. Due to the filling operation (for example with a liquid), each side foil 5 moves away from each other. Since the distance between the side edges 2 is smaller in the area Z than in the other areas, the foil bag contracts laterally in the area Z. As a result, the outer edges 6 of the welding seam 2 also move in directions approaching each other. Thereby, a shape like a constriction is obtained. Numeral 7 indicates the upper weld seam which is closed after the foil bag has been filled.

In the manufacturing process, foil sheets for each side foil and bottom foil are drawn from the respective supply rolls. The foils are stacked so that they fit exactly together and are glued, heat-sealed or welded together at future side edges. In order to provide an extension in zone Z, the welding head has a shape which is enlarged in the middle corresponding to the shape of the welding seam, so that the side foils are connected to one another over the entire connection surface 2. . After welding of the side foils and gluing, heat sealing or welding to add the bottom foils, the welded foils are cut along the future outer edges 6 to form individual foil bags.

FIG. 3 shows a foil bag 10 according to another embodiment of the present invention. In the foil bag 10, the distance between the side edges 2 is reduced at the upper portion 11. Each outer edge 6 is straight in the area Z where the side edge 2 is extended.

As shown in FIG. 4, the foil bag of the second embodiment has a bottle-like appearance when filled. Since the seams 2 on both sides converge at the upper part 11, an appearance like a bottle neck is obtained.

When filled, each extension area 3 of the seams 2 on both sides gives the foil bag a waist-like shape, which gives a bottle-like appearance and makes it easier to hold the bag. However, in the unfilled state, the bag has a generally rectangular appearance in zone Z. For this reason, storage, handling and packing of unfilled foil bags are easy. Furthermore, there is no waste of the foil during the manufacturing process, as would be caused by punching out the corresponding part of each side foil to obtain a constriction. Compared to a constricted foil bag with side edges that have been given a constricted shape by punching, the foil bag of the present invention can eliminate the punching operation and can be manufactured faster and cheaper. .

The method of connecting the foils may be any method as long as the foils are connected so that the foil bag is sealed, for example, bonding using an adhesive, heating and / or heating. Fusion by pressure, welding and the like can be mentioned.

In the above-described embodiment, the upper part is closed by directly welding two side foils to each other after the filling operation, but the top foil for increasing the filling capacity in a state of being spread like a bottom foil is used. It can be provided between the two side foils at the top of the foil bag to increase the filling capacity.

[Brief description of the drawings]

FIG. 1 is a side view of an unfilled state of a foil bag according to a first embodiment of the present invention.

FIG. 2 shows the foil bag of FIG. 1 filled and closed;

FIG. 3 is a side view of a foil bag according to a second embodiment of the present invention in an unfilled state.

FIG. 4 shows the foil bag of FIG. 3 filled and closed;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Foil bag of 1st Embodiment, 2 ... Side welding seam, 3 ... Expansion part of welding seam, 4 ... Bottom foil,
5 ... side foil, 6 ... outer edge of weld seam, 7 ... upper weld seam, 10 ... foil bag of second embodiment, Z ... area where weld seam is expanded

Continued on the front page (72) Inventor Hans-Peter Bild, Germany 69214 Eppelheim / Heidelberg, Rudolf-Bird-Strasse 4-6 (72) Inventor Eberhard Kraft, Germany, 74924 Neckerbischoffscheim, Hebel Strase 1 F term (reference) 3E064 AB11 AB25 BA22 BC18 EA04 FA04 GA01

Claims (7)

[Claims] 1. Two side foils connected to each other at least at two opposite side edges via respective connection surfaces;
A bottom foil inserted between said side foils, wherein in zone (Z) at least one of said connecting faces (2) of said two side edges of said foil bag is an extension (3). Wherein the distance (B) between the connecting faces (2) of the two opposite side edges of the side foil (5) is reduced in the zone (Z). bag. 2. A foil bag according to claim 1, wherein both of said connecting surfaces of said two side edges have respective extensions in said zone. 3. The foil bag according to claim 1, wherein the connection surface is a welding surface or a heat-sealing surface. 4. The foil bag according to claim 1, wherein the connection surface comprises an adhesive surface. 5. The foil bag according to claim 1, wherein the side foil is substantially rectangular. 6. The distance between the connecting surfaces (2) of the two opposing side edges is reduced at the upper part (11) of the foil bag (10). 5. The foil bag according to any one of 4. 7. The foil bag according to claim 1, wherein an upper foil is provided on an upper part of the foil bag.