Flexible bags – Bag closure secured by a releasable or frangible bond
Reexamination Certificate
2000-02-24
2001-10-02
Pascua, Jes F. (Department: 3727)
Flexible bags
Bag closure secured by a releasable or frangible bond
C206S484000
Reexamination Certificate
active
06296389
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an easy-to-open packing bag that can be opened easily by separating heat-bonding portions from each other.
BACKGROUND ART
Heretofore, an easy-to-open packing bag having the following construction as shown in
FIG. 6
is used to pack an elongated flat article such as a blood sugar value measuring electrode therein. Surfaces of thermoplastic resinous layers of two rectangular packing films each consisting of a backing layer and a thermoplastic resinous layer are laminated on each other. One of the shorter sides of each packing film is formed as a non-bonding portion
15
. A separable U-shaped peripheral heat-bonding portion
12
is formed along the other three sides of each packing film. A separable mountain-shaped projected heat-bonding portion
13
connecting both ends of the peripheral heat-bonding portion
12
with each other and projected outward is formed and sealed. A pair of confronting partitioning heat-bonding portions
14
projecting inward is formed to the peripheral heat-bonding portion
12
to accommodate a content
7
such as the blood sugar value measuring electrode in a space positioned at one side and a drying agent
8
in a space positioned at the other side. When the packing bag having the above-described construction is used to accommodate the blood sugar value measuring electrode therein, the external and internal packing films of the non-bonding portion
15
are picked up with fingers and pulled in opposite directions, and then, both projected heat-bonding portions
13
are separated from each other from ends thereof to a tearing line
16
. Then, the separated portions of the packing films are bent outward to expose an end of the blood sugar value measuring electrode to the outside from the easy-to-open packing bag. Then, the exposed portion is impregnated with blood to measure a blood sugar value. However, the area of the nonbonding portion
15
is not large and thus it is not easy to pick up the non-bonding portion
15
. Further, a strong force is required to separate the entire heat-bonding portions
13
from each other from the ends thereof. Thus, if an excess force is applied to the packing films to open the easy-to-open packing bag, the entire packing films separate from each other and the blood sugar value measuring electrode drops from the easy-to-open packing bag. Thus, it is difficult for old men who have to use the blood sugar value measuring electrode frequently to open the easy-to-open packing bag.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide an easy-to-open packing bag allowing an end of a content to be easily exposed to the outside by separating heat-bonding portions and tearing the external packing film.
In the easy-to-open packing bag, a pair of rectangular-shaped packing films, each of which comprises a substrate layer and a thermoplastic resinous layer, are laminated on each other, with surfaces of the thermoplastic resinous layers being opposed to each other; a predetermined region on one side of the packing films is formed as a non-heat-bonding portion; a U-shaped peripheral heat-bonding portion is formed on three other sides of the packing films: a projected heat-bonding portion, connecting a pair of ends of the peripheral heat-bonding portion and projecting outwardly, is formed; at least the projected beat-bonding portion is separably sealed; and a notch is formed on at least one of a pair of edges of an external one of the packing films such that said notch is located at a position adjacent to one end of the peripheral heat-bonding portion. In this case, the corner of the non-bonding portion of the external packing film and that of the non-bonding portion of an internal one of the packing films are picked up with fingers and pulled in opposite directions. As a result, the outward end of the projected heat-bonding portion of the external packing film and that of the projected heat-bonding portion of the internal packing film separate from each other, and at the same time, the external packing film starts to tear from the notch. As the separation operation continues, both projected heat-bonding portions separate from each other, and the external packing film tears. That is, the non-bonding portion located at one side of the external packing film with respect to the notch is removed to expose an end of the content. Thus, an easy usage can be realized.
In the easy-to-open packing bag, the heat-bonding strength of the projected heat-bonding portion is set to 500-2000 g per 15 mm width, so that the projected heat-bonding portions can be separated from each other easily when the corner of the non-bonding portion of the external packing film and that of the non-bonding portion of the internal packing film are picked up with fingers and pulled in opposite directions.
In the easy-to-open packing bag, the heat-bonding strength of the projected heat-bonding portion is set lower than that of the peripheral heat-bonding portion, so that even when an excess force is applied to the two packing films in separating the projected heat-bonding portions from each other, the packing films cannot be separated from each other at the peripheral heat at bonding portion. Thus, there is no possibility that the two films are separated from each other and that the content drops from the easy-to-open packing bag.
In the easy-to-open packing bag, a heat-bonding strength adjusting layer is applied to the region of the surface of the thermoplastic resinous layer of each packing film on which the projected heat-bonding portion is to be formed. In this manner, it is possible to reduce the heat-bonding strength of the projected heat-bonding portion.
REFERENCES:
patent: 3342326 (1967-09-01), Zackheim
patent: 3724651 (1973-04-01), Link
patent: 3809228 (1974-05-01), Fowler et al.
patent: 4136776 (1979-01-01), Poncy
patent: 4630729 (1986-12-01), Hirt et al.
patent: 4720011 (1988-01-01), Canamero
patent: 4871091 (1989-10-01), Preziosi
patent: 53-110383 (1978-09-01), None
patent: 6-183481 (1994-07-01), None
Manabe Kazutaka
Yamada Shin
Yamamoto Sadao
Matsushita Electric - Industrial Co., Ltd.
Pascua Jes F.
Wenderoth , Lind & Ponack, L.L.P.
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