Packaging bags and method of producing same

Details Packaging bags and method of producing same Packaging bags and method of producing same

2000-09-27

2001-11-06

Pascua, Jes F. (Department: 3721)

Flexible bags

With closure

Overlapped flaps

C383S086000, C383S099000

Reexamination Certificate

active

06312157

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to bags for making packages for different kinds of products such as potato chips, candies, cereal foods, salt, sugar and detergents.
As a trend in the modern world, more people are eating light snacks. As a result, enormous amounts of snack foods such as potato chips are being sold and consumed daily. When such snack foods are purchased by the consumer, they are usually packaged in laminated package bags, or package bags of different kinds such as the so-called pillow type, quadrangularly sealed type or standing paunch type. When the products thus differently packaged are transported by a wholesaler to retail stores, the shipments are usually made in corrugated fibreboard boxes, each box filled either mechanically or manually with a specified number of filled packaging containers. Because prior art types of packaging containers invariably include so-called dead spaces, these boxes become unnecessarily bulky. Since this inevitably affects the cost of transportation, there have been attempts to reduce the dead space as much as possible. Containers in the shape of a rectangular parallelopiped may be considered advantageous because they can be tightly packed inside a box and do not rattle too much when being transported but they tend to make their contents to appear too small. Other disadvantages of this type include that only a limited amount of articles can be packaged inside and that the packaged products are likely to be damaged.
In view of the above, Japanese Utility Model No. 2593457, Japanese Patent No. 7-293012 and U.S. Pat. No. 5,570,569 (issued Nov. 5, 1996 to Masuda) disclosed a packaging container as generally shown at
101
in
FIG. 11
, characterized as being made of a soft packaging material in the shape of a generally rectangular column (with a front wall
102
, a back wall
103
and side walls
104
) as well as a planar bottom and a uniformly sloped upper lid
106
. These containers have been popular in the market because they can be packed efficiently inside a fiberboard box or the like, as shown in
FIG. 12
, and the dead space between the containers can be reduced as closely to zero as possible.
The package container
1
shown above is formed from a single sheet of soft packaging material by folding it forward and backward. After the sloped lid
106
is formed, the back wall
103
is made taller than the highest part of the sloped lid
106
, protruding further above. This portion has no practical function and used to be cut off, and this amounted to a waste of material.
SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide package bags with improved opening part.
It is another object of this invention to provide such packaging bags which can be transported efficiently.
It is still another object of this invention to provide such packaging bags which can be easily opened and closed again.
It is a further object of this invention to provide such packaging bags of which even the upwardly protruding back wall portion can be utilized for the closing.
It is a still further object of this invention to provide such packaging bags that can be produced economically by cutting a single larger material sheet into individual smaller sheets each for producing one of these bags.
Packaging bags embodying this invention, with which the above and other objects can be accomplished, may be each characterized as being produced by folding a single foldable material sheet and comprising not only a main body having a front wall, a back wall, side walls which stand up from a flat bottom and a lid which is uniformly sloped upward from the front wall to the back wall to close the bag but also a trapezoidally folded flap which extends upward from the back wall and is folded forward to form a seal ridge where the bag is initially sealingly closed and also to close the bag so as to be easily reopened by means, for example, of fastening tapes of a known kind or of belt-loop like member under which the tip of the flap can be retractably inserted.


REFERENCES:
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patent: 2896639 (1959-07-01), Barnes et al.
patent: 2948457 (1960-08-01), Thiele
patent: 2992768 (1961-07-01), Gatward
patent: 3493166 (1970-02-01), Smith et al.
patent: 0148834 (1952-02-01), None
patent: A0732283 (1960-09-01), None
patent: 0510372 (1939-08-01), None
patent: 1124757 (1968-08-01), None
patent: 404189753-A (1992-07-01), None

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