Folding box with inner bag and process for manufacturing same

Details Folding box with inner bag and process for manufacturing same Folding box with inner bag and process for manufacturing same

1993-02-09

1994-10-18

Elkins, Gary E.

Receptacles

Receptacle having flexible, removable inner liner

Means for venting air trapped between the liner and its...

220416, 220418, 493 60, 493 62, 493 96, B65D 556

Patent

active

053560280

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a pre-glued, flat folding box, consisting of a body portion comprising flaps connected to the open sides of the body portion and a tubular foil section having open ends and arranged in the body portion which, when erected, has a cross section corresponding to the inner cross section of the body portion. Folding boxes of this kind are generally known.
These folding boxes are used for packaging pourable products, especially liquids. They are delivered to the filler of the pourable product in flat condition for saving space. At the filler, these folding boxes are erected in a filling and packaging machine, are sealed and closed first at one end, filled with the product and then sealed and closed at the other end.
Experience has shown that the erection of the folding box has caused certain difficulties in the packaging machine. These difficulties result from the fact that the tubular foil is very flat in the flat folding box, so that its walls contact each other and a certain lip effect develops at its edges during erection, since no air can flow into the interior of the tubular foil section due to the close contact of the tubular foil walls. On the contrary, the vacuum generated during the erection of the folding box in the interior of the tubular foil section even increases this lip effect. After erection it can be seen that at the open cross section of the tubular foil section only two opposite corners are present in a more distinct form, i.e. the corners at which the tubular foil section was located in folded form in the flat folding box. This insufficient formation of the desired rectangular form of the cross section opening of the tubular foil section causes difficulties in filling the erected folding box as well as in sealing the tubular foil section.
It is the object of the invention to provide a folding box of the above mentioned kind, which is easier to erect, to fill and to seal.


SUMMARY OF THE INVENTION

In contrast to the prior art, in the invention the tubular foil section in the folding box comprises continuously embossed fold lines extending up to the edge of the tubular foil section at all locations which are in the corners of the body cross section, said fold lines providing the tubular foil section in erected not closed condition of the folding box with a basically rectangular cross section.
Combined with a certain spring force of the tubular foil material, the fold lines, which are located in the pre-glued, flat folding box in the fold lines, which join contiguously lying walls of the folding box body, have the effect, that the above mentioned lip effect is basically avoided. An insulating air cushion is generated between the walls lying on one another in the non-erected condition of the folding box, especially in the area between the flaps, said insulating air cushion preventing the edges of the tubular foil section from lying on one another completely tight. Because of the air cushion, the edges of the foil sections do not stick together and completely seal the interior of the tubular foil section to the outside due to the vacuum occuring in the interior during erection of the folding box.
In the erected condition of the folding box, the tubular foil section offers a better rectangular form of the opening cross section in the area between the flaps with which it is not connected to, which facilitates not only the filling process but also the following sealing process of the tubular foil section, e.g. by means of welding.
The invention is especially suitable in combination with tubular foil materials, which have a certain spring force which is the case e.g. in certain plastic foils.
Compound foils made of paper and plastic, of paper, aluminium and polyethylene, of aluminium and plastic or of different kinds of plastic are suitable as tubular foil material. So-called mono-foils which are especially desriable due to waste disposal reasons can be used, as well as polyester foils.
The sealing of such foils is done by the aid of heat, ultr

REFERENCES:
patent: Re20789 (1938-07-01), Bergstein
patent: 1705748 (1929-03-01), Bridgman
patent: 2493337 (1950-01-01), Buttery
patent: 2589022 (1952-03-01), Page, Jr. et al.
patent: 2710134 (1955-06-01), Schroeder et al.
patent: 2799211 (1957-07-01), Zerlin et al.
patent: 2950036 (1960-08-01), Vergobbi
patent: 3038889 (1963-04-01), Christensson
patent: 3182883 (1965-05-01), Doble, Jr.
patent: 3459357 (1969-08-01), Egger et al.
patent: 3550833 (1970-12-01), Rahenkamp
patent: 3878771 (1975-04-01), Malcolm
patent: 3907193 (1975-09-01), Heller
patent: 4478351 (1984-10-01), Homma

Affiliated with

Also associated with

Rating

Folding box with inner bag and process for manufacturing same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Folding box with inner bag and process for manufacturing same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Folding box with inner bag and process for manufacturing same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2366667