JP2001072080A - Self-supporting bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-supporting bag easy to make, easily filled with content, easy to handle, excellent in appearance and design effect, still more enhanced in self-supporting stability and good in productivity. SOLUTION: A self-supporting bag 100 has a bottom part at the lower part thereof in a form having a gusset part 6 and this gusset part is formed by inwardly folding a bottom surface film to insert the same in the gap between the lower parts of the laminated films 1 of both front and rear wall surfaces of the bag and heat-sealing the inserted part in a ship bottom-shaped seal pattern and, at this time, the films of the gusset part of both front and rear sides are respectively extended to provide the protruded part 7 downward protruding from the whole lower side of the bag 100 in an arcuate shape to the lower end of the bag 100 and both side end edge parts of the laminated films 1 of both wall surfaces are heat-sealed at side seal parts 3, 3 to form a body part. Easy opening means such as notches 8, 8 are pref. provided to the opening positions of the bag 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a self-supporting bag,
More specifically, the present invention relates to a self-supporting bag in which the shape of the bottom portion of the bag is improved and the self-supporting property of the bag after filling the contents is further improved.

[0002]

2. Description of the Related Art Conventionally, an ordinary self-supporting bag called a standing pouch has a gusset portion formed by folding a bottom film inward and inserting the bottom film between lower portions of a laminated film on both front and rear wall surfaces. Formed in the form, near the lower end of both sides of the folded bottom film is provided with a bottom film cutout portion such as a semicircle, and the gusset portion is formed by heat sealing with a ship bottom shape seal pattern, The body was formed by heat-sealing both side edges of the laminated film on the front and rear wall surfaces with side seal portions having a predetermined width.

[0003] In such a self-supporting bag, the contents are filled from the upper opening, so that the gusset portion at the bottom together with the trunk expands in a cylindrical shape, and at the bottom, the bottom seal portion of the ship bottom shape is used. At the same time, the lower edge of the gusset portion is heat-sealed, and at the same time, the side portions on both sides thereof are heat-sealed with the laminated films on the wall surface at the bottom film notch portion, so that the outer periphery of the bottom portion is In the case of (1), a ring-shaped leg portion was formed by the heat seal portion, and thereby the bag was provided with autonomy.

However, the self-supporting stability of such a self-supporting bag is not problematic in terms of normal handling after filling the contents and self-sustainability at the time of display at a store, for example, when the contents are heated. For foods that are eaten, when using the method of heating the bag with a microwave oven or the like by opening a part of the upper part of the bag as a steam vent when heating it, Since the bag is rotated by the rotating tray of the microwave oven, the self-standing bag may fall on the tray and the contents may spill out of the bag, and it is necessary to further improve the self-standing stability.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a high-productivity manufacturing process in the same process as a normal self-supporting bag. It is excellent in filling suitability and preservability of contents, and in terms of independence, not only stability during normal handling and store display, but also operation such as heating the contents together with the bag in a microwave oven. An object of the present invention is to provide a self-supporting bag which does not fall down even when the operation is performed, and which is more excellent in self-sustaining stability.

[0006]

The above objects can be attained by the present invention described below. That is, the invention described in claim 1 is such that the bottom portion of the bag is formed in a form having a gusset portion formed by folding the bottom film inward and inserting the bottom film between the lower portions of the laminated films on both side wall surfaces. In a self-supporting bag whose portion is heat-sealed with a ship bottom-shaped seal pattern, a protrusion formed by extending the film of the gusset portion on both sides is provided at the lower end of the front and rear wall surfaces of the bag. It consists of a self-supporting bag.

As described above, a normal self-supporting bag has the bottom portion formed in a gusset form, and the gusset portion is heat-sealed with a ship bottom-shaped seal pattern. Is cut horizontally. When the content is filled in such a self-supporting bag, the bag swells in a cylindrical shape, and a ring-shaped leg portion is formed on the outer periphery of the bottom portion by the heat seal portion. And when I put the bag up,
When the legs are uniformly grounded, stable independence is obtained. However, actually, of the ring-shaped legs,
In the region from both sides of the lower end of the front and rear walls of the bag to the central portion, there is a problem that a slight raised portion is generated and it is difficult to uniformly contact the ground.

[0008] The height of the raised portion is slightly increased from the left and right sides of the lower end of the wall surface of the bag to the center, and is maximized at the center. The height of the raised portion is affected by the configuration of the bottom portion of the bag, that is, the width of the bottom portion and the depth of folding of the gusset portion, the shape of the bottom seal portion of the ship bottom shape, and furthermore, the filling amount of the contents and the like. Although not constant, in the case of a standard bag having an internal capacity of about 500 to 1000 ml, the maximum size is about 2.0 to 4.5 mm.

According to the present invention, in order to supplement the raised portion, a projecting portion is provided by extending the films of the gusset portions on both front and rear sides of the bag downward. Such a protruding portion may have any shape, but is preferably provided so that at least the center of the lower end of the front and rear wall surfaces of the bag is maximized.

[0010] Therefore, by adopting the above-described configuration, it is possible to produce the product in the same production process as a normal standing pouch with high productivity, and it is easy to fill the contents.
It is compact and excellent in appearance for its internal capacity, and easy to handle. In particular, in terms of self-standing stability, it can be more excellent than a normal standing pouch.

According to a second aspect of the present invention, there is provided the self-supporting bag according to the first aspect, wherein the protruding portion is provided in a shape protruding in an arc shape from the entire lower side of the bag.

By adopting such a configuration, in addition to the operation and effect of the invention described in the first aspect, the protrusion can be formed in a smooth circular arc shape at the lower end of the front and rear wall surfaces of the bag. When the bag filled automatically with the contents is maximized and the bag filled with the contents is self-supporting, the entire leg around the bottom is grounded,
The self-standing stability of the bag can be further improved.

[0013] The invention described in claim 3 is characterized in that the protruding portion is provided in a part of the region including the center of the lower side of the bag in such a manner that the tip of the protruding portion has an arc shape. The self-supporting bag according to claim 1,

By adopting such a configuration, in addition to the operation and effect of the invention described in the first aspect, the projecting portion is provided in a partial area including the center of the lower side of the bag. Since the tip is provided in the shape of an arc, when the bag filled with the contents is made to stand by itself, it is possible to supplement the floating portion mainly generated in the region at the center of the lower end of both side walls of the bag. The self-standing stability of the bag can be further improved in substantially the same manner as in the projection according to the second aspect of the present invention.

According to a fourth aspect of the present invention, the projecting portion is provided in a tab-like shape at a central portion of a lower side of the bag or at a plurality of locations on the lower side. It is a sex bag. The tab-like shape of the protruding portion can be provided in an arbitrary shape such as a semicircular shape or a semi-elliptical shape in addition to a rectangular shape. It is preferable that the length is at least a length that fills the raised portion. However, the length can be further increased so that the bag can be opened at the front and rear sides of the bag to support the bag with its rigidity.

By adopting such a configuration, in addition to the operation and effect of the invention described in claim 1, when the bag filled with the contents is self-standing, the region at the center of the lower end of the wall surface on both sides of the bag is provided. Since the raised portion mainly generated in the bag can be complemented by the tab-shaped projecting portion in a well-balanced manner, the self-standing stability of the bag can be further improved.

According to a fifth aspect of the present invention, there is provided the self-supporting bag according to any one of the first to fourth aspects, wherein an upper portion of the bag is formed to have a narrow width.

By adopting such a configuration, in addition to the functions and effects of the invention described in any one of the above-mentioned claims 1 to 4, the upper part can be formed according to the shape and fluidity of the contents filled in the bag. Can be adjusted, so that operations such as taking out contents can be easily performed. In addition, by forming the upper part of the bag with a narrow width such as a constricted shape, it has a smart appearance similar to containers such as bottles,
The design of the bag can be improved.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A film used for a self-supporting bag of the present invention, a method for manufacturing the bag, and the like will be described below. First, the film used for the production of the self-supporting bag of the present invention is mainly a laminated film mainly composed of plastic, but is not particularly limited, and is used for a packaging bag for a liquid material or other content containing water. Any known laminated film that can be used, depending on the conditions of use, such as the type of contents to be filled and the presence or absence of heat treatment after filling,
A suitable material can be freely selected and used.
However, when using the method of heating the contents filled in the bag together with the bag in a microwave oven, the laminated film should not contain metal foil such as aluminum or metal deposition layer. is necessary.

A typical example of the structure of the laminated film that can be preferably used is as follows. (1) ON film / adhesive / L / LDPE film (sealant layer) (2) ON film / adhesive / PET film / adhesive /
L / LDPE film (sealant layer) (3) ON film / adhesive / PET film / adhesive /
CPP film (sealant layer) (4) ON film / adhesive / biaxially stretched HDPE film / adhesive / L / LDPE film (sealant layer) (5) ON film / adhesive / OPP film / adhesive /
L-LDPE film (sealant layer) (6) ON film (silica or alumina deposited layer) / adhesive / biaxially stretched HDPE film / adhesive / L-LDPE
Film (sealant layer) (7) ON film / anchor coat layer / co-extrusion coat layer (HDPE layer / L / LDPE layer) (sealant layer is L / LDPE layer) (8) ON film / anchor coat layer / co-extrusion Coat layer (HDPE layer / LDPE layer) / adhesive / L-LDP
E film (sealant layer) (9) PET film / adhesive / L / LDPE film (sealant layer) (10) PET film / adhesive / ON film / adhesive /
L / LDPE film (sealant layer) CPP film (sealant layer) (11) PET film / adhesive / ON film / adhesive /
CPP film (sealant layer) (12) PET film / adhesive / (silica or alumina evaporated layer) ON film / adhesive / L / LDPE film (sealant layer) (13) PET film / adhesive / (silica or alumina evaporated) Layer) ON film / adhesive / CPP film (sealant layer) (14) PET film / adhesive / EVOH film / adhesive / ON film / adhesive / CPP film (sealant layer) Instead, various combinations of laminated films can be used.

In the above construction, the ON film is a biaxially stretched nylon film, the OPP film is a biaxially stretched polypropylene film, the PET film is a biaxially stretched polyethylene terephthalate film, L / LDPE is a linear low-density polyethylene, and HDPE is a high-density polyethylene. Density polyethylene,
LDPE refers to low density polyethylene, CPP film refers to unstretched polypropylene film, and EVOH film refers to saponified ethylene-vinyl acetate copolymer film. The anchor coat is a kind of primer coat that is previously coated on the base film side in order to improve adhesiveness when laminating a resin by extrusion coating.

In the construction of the laminated film, ON
Film, PET film, when used for the outermost layer,
When a bag is used as a substrate film to impart mechanical strength, heat resistance, and printability to the intermediate layer, it is mainly used to reinforce mechanical strength. The biaxially stretched HDPE film and the OPP film used for the intermediate layer are used to increase the thickness and rigidity and at the same time to improve the moisture permeability.

The biaxially stretched HDPE film and the OPP film may be a uniaxially stretched HDPE film or a uniaxially stretched polypropylene film. In this case, the layers are laminated so that the stretching direction matches the tearing direction when the bag is opened. By doing so, the tearing can be facilitated and the directionality can be stabilized. The silica or alumina vapor-deposited layer, the EVOH film and the like are laminated to provide gas barrier properties. In addition to these, a gas barrier material such as a polyacrylonitrile film or a coating layer of polyvinylidene chloride is used. Can also be laminated.

As the sealant layer, L·LDP
Two types of examples, E film and CPP film, are given.
L-LDPE film is excellent in heat seal stability and content resistance, such as stress cracking resistance to surfactants, and CPP film is excellent in heat resistance and low odor. It is suitable for packaging contents.

[0025] In addition to the above, the sealant layer may be made of ethylene / α-olefin copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid A polymer, an ethylene / acrylate copolymer, an ionomer, a polyester resin, a low-density to high-density polyethylene, or the like can be appropriately selected and used.

In particular, an ethylene / α-olefin copolymer obtained by polymerization using a single-site catalyst such as a metallocene catalyst has a narrow molecular weight distribution and a stable copolymerization ratio, so that the low-temperature heat sealability and Excellent in hot sealability, such as the self-standing bag of the present invention, such as between the gusset portion and the body seal portion, in the sealant layer of the bag having a step due to the difference in film overlap in the heat seal portion. Is suitable in that the generation of pinholes due to missing seals can be prevented. Furthermore, by using a blend of the copolymer and an olefin elastomer, the heat fluidity of the sealant layer is improved, and the generation of pinholes due to the steps can be more effectively prevented.

Next, a method of manufacturing the self-supporting bag of the present invention, which is manufactured using the above-described laminated film, will be described. The self-supporting bag of the present invention is different from a normal standing pouch in that a protruding portion is provided in a heat seal portion at the bottom and, if necessary, the upper portion is formed to have a narrow width such as a constricted shape. For the bag making itself, a conventional bag making machine for standing pouches (either a single-row bag making machine or a two-row butt bag making machine may be used) and the seal pattern on the bottom and side portions thereof is appropriately changed. Also, by adding a bottom trimming device and, if necessary, a side trimming device, the bag can be easily manufactured.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below more specifically with reference to the drawings. However, the present invention is not limited to these drawings.

FIG. 1 is a front view showing the structure of a first embodiment of the self-supporting bag of the present invention. In FIG. 1, a self-supporting bag 1
00 is formed in a form having a gusset portion 6 in which a bottom film is folded inward and inserted between the lower portions of the laminated films 1 on the front and rear wall surfaces, and the bottom film folded inward In this case, semicircular bottom film cutouts 5 and 5 are provided in the vicinity of the lower ends of both sides, and the gusset portion 6 is heat-sealed by the bottom seal portion 2 having a ship bottom shape. The extension of the film of the gusset portion on both front and rear sides, that is, the laminated film 1 on the front and rear sides and the folded bottom film, and protrudes downward in an arc shape from the entire lower side of the front and rear sides of the bag 100. The part 7 is provided by trimming.

The body is formed by heat-sealing both side edges of the laminated film 1 on both side walls with side seals 3, 3, and is formed in a bag shape with an open top. The upper seal portion 4 is an unsealed opening before filling the contents, and after filling the contents from this portion, heat sealing with a degassing seal or the like is used to seal. This is the same in the self-supporting bag shown in FIGS.

Notches 8, 8 are provided near the lower side of the upper seal portion 4 at the outer ends of the side seal portions 3, 3 as an easy-opening means for opening the bag. It is configured. The notch may be provided on only one side.
In addition, as the easy-opening means, in addition to the notch, a method of providing a half-cut line by laser light irradiation, a method of laminating a uniaxially stretched film on an intermediate layer of a laminated film, a method of attaching a cut tape, and the like. Yes, any of these may be provided alone, or may be provided in appropriate combination.

By adopting such a configuration, the self-supporting bag 100 can be manufactured with high productivity in the same process as a normal standing pouch, and the contents can be easily filled through the upper opening. In addition, it is compact for its capacity and has excellent appearance. The self-supporting bag 100 filled with the contents has a body and a bottom that expand in a cylindrical shape, and a ring-shaped leg formed by the bottom seal portion 2 is formed on the outer periphery of the bottom. , At the lower end of the bag 100,
Since the protruding portions 7 having a shape protruding downward in an arc shape from the entire lower side are provided on the lower sides on both the front and rear sides, when the bag 100 is self-standing, the entire ring-shaped leg is uniformly contacted with the ground, which is more excellent. Independent stability can be obtained.

FIG. 2 is a front view showing the structure of a second embodiment of the self-supporting bag of the present invention. The self-supporting bag 20 shown in FIG.
Reference numeral 0 denotes a configuration in which only the shape of the upper part of the self-supporting bag 100 shown in FIG.

By adopting such a configuration, since the self-supporting bag 200 is formed to have a narrow upper portion and a narrow width, the appearance becomes a smart shape similar to a container such as a bottle, and the design is improved. improves. In addition, the width of the upper opening can be adjusted to be narrow according to the shape or fluidity of the contents, so that the contents can be taken out safely when taken out. The configuration other than the upper portion such as the bottom portion of the self-supporting bag 200 is the same as that of the self-supporting bag
Since it is the same as 0, the same operational effects as those of the self-supporting bag 100 shown in FIG.

FIG. 3 is a front view showing the configuration of a third embodiment of the self-supporting bag of the present invention. The self-supporting bag 30 shown in FIG.
In the configuration of the self-supporting bag 100 shown in FIG. 1, only the shape of the protruding portion 7 provided at the lower end on both the front and rear sides of the bag is applied to a part of the region including the center of the lower side of the bag 300. The protruding portion 7 has a configuration in which the tip is changed to a circular shape.

By adopting such a structure, the self-supporting bag 300 is filled with the contents and the bag 3
Since the raised portion mainly generated in the central portion of the lower end of the wall surface on both sides of 00 is mainly supplemented by the projecting portion 7, the projecting portion 7 provided on the self-supporting bag 100 shown in FIG. In substantially the same manner, the self-standing stability of the bag 300 can be further improved.

FIG. 4 is a front view showing the configuration of a fourth embodiment of the self-supporting bag of the present invention. The self-supporting bag 40 shown in FIG.
In the configuration of the self-supporting bag 100 shown in FIG. 1, only the shape of the protruding portions 7 provided at the lower ends on both front and rear sides of the bag is changed to a tab-like shape at the center of the lower side of the bag 400. It is provided and configured.

The shape of the tab-shaped projection 7 is shown as a horizontally long rectangle in the figure, but it can be provided in any shape such as a semicircle or a semi-ellipse. In addition, the length of the protruding portion 7 may be at least a length that can supplement the rising portion that becomes large near the center of the lower side of the bag.
The height of the protruding portion 7 may be longer than the height of the raised portion, such as 15 mm, so that the tip of the protruding portion 7 may be opened outward and supported by its rigidity.

Even when such a configuration is adopted, when the self-supporting bag 400 is self-supported by filling the contents, the floating portion mainly generated in the region at the center of the lower end of the wall surface on both sides of the bag, Since it is supplemented by the protrusion 7, the bag 4 is substantially similar to the protrusion 7 provided on the self-supporting bag 100 shown in FIG.
00 can further improve the self-supporting stability.

As described above, in the self-supporting bag of the present invention shown in FIGS. 1 to 4, a bottom-shaped seal pattern for heat-sealing the lower gusset portion 6 has a bottom line formed by a curved line. Although illustrated with the seal pattern of, for example,
A ship bottom-shaped seal pattern in which both sides rise straight from the bottom with a certain width and are inclined outward on both sides may be used.

[0041]

As described in detail above, according to the present invention, bag making and filling of contents are easy, and the bag after filling has excellent self-sustainability and is compact for its capacity. It has the effect of being able to provide a self-supporting bag that is easy to handle and excellent in appearance and design with good productivity. In particular, regarding the self-sufficiency of the bag, when the bag filled with the contents is self-supporting, the raised portion mainly generated in the center of the lower end of the wall on both sides of the bag is attached to the lower end of the front and rear side walls of the bag. Since the gussets on the front and rear sides can be supplemented with projections provided by extending the film, for example, the food is heated by a microwave oven or the like and eaten, and the contents filled in a bag are used. Even if the bag is put upright in a microwave oven and heated, the bag does not fall over, and excellent independence stability can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration of a first embodiment of a self-supporting bag of the present invention.

FIG. 2 is a front view showing the configuration of a second embodiment of the self-supporting bag of the present invention.

FIG. 3 is a front view showing the configuration of a third embodiment of the self-supporting bag of the present invention.

FIG. 4 is a front view showing the configuration of a fourth embodiment of the self-supporting bag of the present invention.

[Description of Signs] 1 Laminated film 2 Bottom seal part 3 Side seal part 4 Top seal part 5 Bottom film cutout part 6 Gusset part 7 Projection part 8 Notch 100, 200, 300, 400 Self-supporting bag

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Ohashi 1-1-1, Ichigaya Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (72) Inventor Hidekazu Ishii 1-1-1, Ichigaga-cho, Shinjuku-ku, Tokyo No. 1 Dai Nippon Printing Co., Ltd. F-term (reference) 3E064 AB23 BA22 BC18 HF10 HG07 HP01

Claims (5)

[Claims] 1. A bottom portion of a bag is formed in a form having a gusset portion formed by folding and inserting a bottom film inward between lower portions of laminated films on both front and rear wall surfaces, and the gusset portion is formed in a ship bottom shape. In a self-supporting bag heat-sealed with a seal pattern, at the lower end of the front and rear sides of the bag,
A self-supporting bag provided with protrusions formed by extending films of gusset portions on both sides. 2. The self-supporting bag according to claim 1, wherein the projecting portion is provided in a shape protruding in an arc shape from the entire lower side of the bag. 3. The projection according to claim 1, wherein the projection is provided in a partial area including the center of the lower side of the bag in such a manner that the tip of the projection has an arc shape. Freestanding bag. 4. The self-supporting bag according to claim 1, wherein the protruding portion is provided in a tab-like shape at a central portion of a lower side of the bag or at a plurality of positions on the lower side. 5. The self-supporting bag according to claim 1, wherein an upper portion of the bag is formed with a narrow width.