Package making – Methods – Forming or partial forming a receptacle and subsequent filling
Patent
1985-12-28
1987-08-11
Coan, James F.
Package making
Methods
Forming or partial forming a receptacle and subsequent filling
53570, 383121, 493218, 493936, B65B 4310
Patent
active
046852760
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a method for producing and filling bottom-fold bags made of endless tubular material which in one embodiment of the invention is made of endless flat material, whereby in order to produce two lateral, substantially triangular bottom-flaps, in the vicinity of which the tubular material is in three layers, and the substantially rectangular standing surface produced thereby, the tubular material is folded in from the sides of thebag to be formed and, after a bottom longitudinal seam has been formed by pressing the said tubular material together, and connecting together the layers of tubular material thus caused to bear one upon the other, followed by separation, filling with a preferably freely flowing product is carried out, at least the two layers of the bottom-flaps, facing away from the bottom surface of the bag, being united longitudinally. The invention also relates to an apparatus for producing and filling bottom-fold bags made of endless tubular material which in one embodiment of the invention is made of endless flat material, substantially vertical mobile devices (20,22), for uniting the bottom-flap layers (38,40,42) being provided in the vicinity of the bottom-flaps (34,36), the said apparatus being more particularly for the execution of the aforesaid method. The invention furthermore relates to a bottom-fold bag comprising two substantially triangular, double-layer bottom-flaps which are fitted to adjoin a substantially rectangular bottom-surface, having a longitudinal bottom-seam, from the sides of the bottom-fold bag, in the interior thereof, at least the two layers of the bottom flaps, facing away from the bottom-surface, being connected together, the said bag being produced, more particularly by the aforesaid method and/or with the aforesaid apparatus.
BACKGROUND OF THE INVENTION
Methods and apparatuses of the types described hereinbefore are being used to an ever inceasing extent for the manufacture of bottom-fold bags, more particularly those made of an endless tubular synthetic material, for example high-pressure polyethylene. Forming the bottom-flaps serves, among other things, to provide a base whuch is as rectangular as possible, so that the bag remains upright after it has been filled. This makes it easier to store the filled bag and, especially, a bag which has already been opened by the consumer. There is, however, a difficulty in the case of known bottom-fold bags, in which the bottom flap layers are not connected together, but are merely pressed together by the product in the bag, in that, especially in the case of a product of little internal consistency, for example animal litter, granular materials, and other freely flowing goods, the bottom tends not to retain its flat configuration in a satisfactory manner, so that the bag does not stand very well.
U.S. Pat. No. 3,739,977 discloses a method of the type mentioned at the beginning hereof in which the triangular, double-walled bottom-flaps are connected together at the four corners of the lateral walls. Similar methods and bottom-fold bags are also known from U.S. Pat. Nos. 3,772,116 and 4,230,030. U.S. Pat. Nos. 4,079,662 and 4,365,459 also disclose apparatuses of the above type for the production of bottom-fold bags. It has been found, however, that the methods, apparatuses and bags in question do not satisfactorily meet the requirements of inexpensive production of bottom-fold bags, with a reliably flat configuration of the standing surface, especially in the case of freely flowing goods. A side-fold bag, disclosed in German Patent No. 830,157, in which the bottom flaps are glued to the bottom part, is also unsatisfactory in this respect.
OBJECTS OF THE INVENTION
It is therefore the purpose of ths invention to provide a method, an apparatus, and a bottom-fold bag of the type in question which are inexpensive and which ensure that the flat configuration of the substantially rectangular base is maintained, even when the bag contains a freely flowing product etc., at the same
REFERENCES:
patent: 596373 (1897-12-01), Lorenz
patent: 3083618 (1963-04-01), Vergobbi
patent: 3552087 (1971-01-01), Schneider
patent: 4365459 (1982-12-01), Sig
Coan James F.
EFFEM GmbH
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