Flexible bags – Wall details – Reinforced
Patent
1996-06-20
1998-06-30
Garbe, Stephen P.
Flexible bags
Wall details
Reinforced
220 91, 383104, 383122, 493218, B65D 3018, B65D 3302
Patent
active
057723320
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention is related to a container having a rectangular base and it concerns also a method for manufacturing same. By using the term "container" it is referred to a container manufactured of sheets or films of flexible material formed into a suitable shape useful for containing unitary items, powdered or granulated material or liquids.
BACKGROUND OF THE INVENTION
Containers with which the present invention is concerned are a practical and cheap way for packing goods and are thus very common in the food industry although not restricted to that field. The major advantages of containers are that they are easy to manufacture, cheap and are usually suitable for holding a variety of products. Such containers require minimal space in storage and are easily disposed of.
The most used form of container is the so-called "pouch" which is a sheet of material, e.g. paper, cardboard, plastic or a laminate formed into the shape of a bag or sack.
In some cases pouches are integrally formed with a base. However, such pouches are not self-standing and they require the internal pressure of their contents for stability. Furthermore, such pouches are usually oval and are thus less stable and also require more storage space. Still another drawback is that the structure of such products is not firm and thus they may collapse when they are not completely full.
In the present description and claims, the terms "heat weldable material" or "heat weldable surface" are used for determining layers of plastic material, e.g. polyethylene, polypropylene, etc. which, upon heating melt and may then be adhered to other such layers by a process which hereinafter in the specification will be referred to as "welding". The term "heat weldable" is also referred to in the art as "heat sealable".
Typical containers are made of a single sheet folded into a container's shape with overlapping portions which are then glued or welded to one another. Such containers are usually not suitable for containing liquids and do not have a rigid structure whereby they collapse when their contents are partially withdrawn. Furthermore, containers manufactured according to the heretofore known methods are usually restricted to pouch or prismatic box-like containers.
It is an object of the present invention to provide a novel and improved container and a process for manufacturing, same in which the above-referred to disadvantages are substantially reduced or overcome.
SUMMARY OF THE INVENTION
According to the present invention there is provided a container made essentially of one or more film sheets, the container having a bottom base and walls extending upwardly therefrom; the base being essentially rectangular and defining front, rear and two side sections of the walls; the base being made of a film with both of its faces being heat weldable and the walls being made of a film having at least an inner heat weldable face; the container being constructed from a pouch having a front, rear and bottom sheet; the bottom sheet of the pouch being folded along a midline thereof with flaps extending downwards from the fold line and each of the two bottom edges of the flaps being welded to or integral with one bottom edge of either the front or the rear sheet, lateral edges of the front and rear sheet being welded to one another with the two bottom portions of the welded edges sandwiching both lateral edges of the bottom folded sheet; for construction of the container, a central portion of the bottom sheet is unfolded such that the unfolded portion has an essentially rectangular shape thus forming said base, with central parts of the bottom edges of the bottom sheet forming the front and rear edges of the base and with peripheral portions of the bottom sheet forming two overlapping triangular portions with the bottom edges thereof defining the two side edges of the rectangular base, thereby forming the container's front and rear wall sections extending from said front and rear edges and side walls extending from said side edges with th
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Garbe Stephen P.
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