JP2003026189A - Self-standing bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for a bottom film besides a wall film as in a standing pouch, to simplify the structure, and to reduce the manufacturing cost, in a self-standing bag that hermetically packages liquid contents such as drink. SOLUTION: The edges of a laminated film 1 is heat sealed to form a three- side-sealed or four-side-sealed flat bag. The flat bag is shaped so that the front and rear of the bottom of the flat bag stick out with a rectangular flat shape defined at the bottom. In addition, the sticking portions, or heat seal portions 5, on both the sides of the bottom are flatly heat sealed to form plate-like portions 6 sticking sideways. By firmly putting the rectangular flat bottom in position, the self-standing bag 100 supports itself. The plate-like portions 6 may be bent and fixed to the underneath of the bottom of bag or to the sides of the bag.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-supporting bag, and more specifically, as a method for imparting self-supporting property to a bag, it has hitherto been
The present invention relates to a self-standing bag capable of imparting a self-supporting property by a simpler method, unlike a method of forming a bottom film of a bag by inserting a bottom film like a commonly used standing pouch.

[0002]

2. Description of the Related Art Conventionally, a standing pouch type bag has been used in most cases as a bag capable of safely sealing and packing liquid contents and having self-standing property. There is also a gusset type bag, but this has a problem that the self-sustaining stability is slightly lacking when filling the liquid contents, and when taking out the contents, both sides (gusset part) of the upper part of the bag are inside. Because it is folded in and heat-sealed, tools such as scissors are needed for opening, which is troublesome.

In this respect, the standing pouch type bag has almost no risk of liquid leakage due to defective sealing even when filled with a liquid content, has excellent self-standing stability, and has an upper part of the bag. Like the four-sided sealed bag, the shape is simple, so it is easy to open it with notches, and it is also easy to form a spout with a narrow width using a heat-sealing pattern. is there.

[0004]

However, even in such a standing pouch type bag, it is necessary to prepare a bottom film in addition to the wall film as a laminated film to be used, and the bag is almost always made. There are problems such as inconvenience in production and an increase in manufacturing cost because a dedicated bag-making machine is required.

The present invention has been made to solve such problems, and an object thereof is a relatively small bag capable of safely hermetically packaging beverages and other liquid contents. However, it is excellent in self-supporting property, and there is no need to prepare multiple laminated films such as front and rear wall film and bottom film like a standing pouch, and at the bag making stage, it is a bag of three-way seal type or four-way seal type, or a pillow. You can also use a bag-making machine such as a type of bag, and you can easily and at low cost by forming and filling the bottom and the body using a dedicated molding, filling and sealing device, and heat sealing. It is to provide a self-supporting bag that can be manufactured.

[0006]

The above-mentioned problems can be solved by the present invention described below. That is, according to the invention described in claim 1, in a bag formed by heat-sealing the edge portion of the laminated film into a bag shape, the lower portion of the bag is spread forward and backward, and a rectangular flat bottom surface is formed at the bottom portion. At the same time, the protrusions formed on both sides of the bottom surface are flatly heat-sealed to form a plate-like piece that protrudes in the lateral direction.
The bag is a self-supporting bag having self-supporting property.

By adopting such a structure, a rectangular flat bottom surface is formed at the bottom of the self-standing bag, and the projecting portions formed on both sides of the bottom surface are flatly heat-sealed. The flat bottom of the shape is surely maintained, and the self-supporting bag is provided with good self-supporting property. In addition, the protruding parts on both sides of the bottom surface of the self-supporting bag are flatly heat-sealed to form a plate-like piece that protrudes in the lateral direction, so this part also has the function of assisting self-supporting, further improving self-supporting. Can be made. The shape of the upper part of the self-supporting bag is not particularly limited, and it can be freely formed such as forming a drinking mouth or forming a spout according to the contents to be filled, the usage of the self-supporting bag, and the like. . Such a self-standing bag can be used for a wide range of purposes such as a bag for packaging beverages and the like, and a refill bag used for refilling a container with contents.

The invention described in claim 2 is the self-supporting bag according to claim 1, wherein the laminated film is formed of a laminated film in which at least paper is laminated on the intermediate layer.

In the present invention, the laminated film used for the self-supporting bag is not particularly limited, and includes, for example, a laminated film using a plastic film as a base material, which is used for a usual liquid packaging bag, and an intermediate film. A laminated film in which at least paper is laminated in layers can also be appropriately selected and used according to the shape of the bag, the use conditions, and the like. The paper may be a thin paper such as a label paper, or a thick paper such as used in a cup base paper or a relatively small liquid paper container.

By adopting the above construction, in addition to the function and effect of the invention described in claim 1, the whiteness is imparted by the paper to improve the printing effect, and the rigidity of the laminated film is increased. In addition, especially when relatively thick paper is laminated on the intermediate layer, a pressing rule may be provided at a necessary position, which makes it easier to fold the bent portion. The shape-retaining effect is further improved, and the self-supporting property of the bag can be further improved.

According to the third aspect of the present invention, the plate-shaped pieces formed on both sides of the bottom surface are fixed to the bottom surface or the side surface of the bag by being folded under the bottom surface or folded up. The self-supporting bag according to claim 1 or 2. The method of fixing the plate-shaped piece to the bottom surface or the side surface of the bag may be fixed using an adhesive such as hot melt, and when the outermost layer of the laminated film is a heat-adhesive resin such as polyethylene, it is hot. You may heat-weld with air etc.

By adopting such a configuration, in addition to the function and effect of the invention described in claim 1 or 2, the plate-shaped pieces formed on both sides of the bottom surface have no auxiliary effect of self-supporting property, but have a rectangular shape. The shape retention effect of the flat bottom surface is enhanced and the shape of the bottom portion is clean, so that good self-supporting property can be maintained, and the handleability and appearance can be improved.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. As described above, the self-supporting bag of the present invention is a bag obtained by heat-sealing the edge portions of the laminated film into a bag shape, by spreading the lower part of the bag back and forth to form a rectangular flat bottom surface on the bottom part. Along with that, it is characterized in that the bag is provided with self-supporting property by flatly heat-sealing the projecting portions formed on both sides of the bottom surface to form a plate-shaped piece projecting in the lateral direction. The portion other than the bottom portion such as the upper portion can be formed in any shape.

Therefore, in a simple form, for example, as shown in FIGS. 1 (a) and 1 (b), a three-way seal type bag can be used. That is, (a) in FIG.
As shown in, the laminated film 1 is folded back at the bottom,
Edge seals on both sides are heat-sealed by the side seal parts 3 and 3, and the upper seal part 4 uses a three-way seal type bag that opens before filling the contents, and the jig is inserted from the upper opening part. The body is expanded into a rectangular tube shape to form a rectangular flat bottom surface at the bottom, and the projections (triangular projections in this case) formed on both sides of the bottom surface are flattened. The bag is made self-supporting by heat-sealing with the plate-like piece 6 protruding in the lateral direction, and after the bottom is formed, the contents are filled from the opening in the upper part, and then, Similar to a normal bag, the upper edge is flatly heat-sealed by the upper seal portion 4 and has a rectangular flat bottom surface at the bottom as shown in FIG. The self-standing bag in which the plate-like piece 6 protruding in the lateral direction is formed is completed.

The method for manufacturing such a self-supporting bag is not particularly limited, and after the bag of the three-way seal type is once manufactured as described above, it is manufactured by molding the bottom portion into a rectangular flat bottom surface. Alternatively, it may be produced from a flat laminated film by using a forming device or the like to perform the molding and heat sealing of the bottom portion and the body portion all at once. Furthermore, when a material having a high rigidity such as a relatively thick paper layered on the intermediate layer is used as the laminated film, it is possible to provide a pressing rule at a necessary bending portion to facilitate the molding.

The laminated film used for such a self-supporting bag is, for example, a laminated film having a plastic film as a base material, which is used for a usual bag for liquid packaging, and at least the above-mentioned intermediate layer. Laminated films made by laminating thin or relatively thick papers can be used. In the case of using a laminated film having a plastic film as a base material, the following configurations are typical examples of the configuration.

(1) ON film / adhesive / L LDPE
Film (sealant layer) (2) ON film / adhesive / biaxially stretched HDPE film / adhesive / L LDPE film (sealant layer) (3) ON film / adhesive / biaxially stretched PP film / adhesive / L・ LDPE film (sealant layer) (4) ON film / adhesive / aluminum foil / adhesive /
L·LDPE film (sealant layer) (5) ON film / adhesive / biaxially oriented PP film / adhesive / aluminum foil / adhesive / L·LDPE film (sealant layer) (6) ON film (silica or alumina or Aluminum vapor deposition layer) / adhesive / biaxially stretched HDPE film / adhesive / L LDPE film (sealant layer) (7) ON film / adhesive / (silica or alumina or aluminum vapor deposition layer) PET film / adhesive / L・ L
DPE film (sealant layer) (8) ON film / anchor coat layer / co-extrusion coat layer (HDPE layer / L LDPE layer) (sealant layer is L LDPE layer) (9) ON film / anchor coat layer / co Extrusion coating layer (HDPE layer / LDPE layer) / adhesive / L ・ LDP
E film (sealant layer) (10) PET film / adhesive / L / LDPE film (sealant layer) (11) PET film / adhesive / aluminum foil / adhesive / ON film / adhesive / L / LDPE film (sealant) Layer) (12) PET film / adhesive / aluminum foil / adhesive / ON film / adhesive / CPP film (sealant layer) (13) PET film / adhesive / ON film / adhesive /
Aluminum foil / Adhesive / L LDPE film (sealant layer) (14) PET film / Adhesive / ON film / Adhesive /
Aluminum foil / adhesive / CPP film (sealant layer) (15) PET film / adhesive / EVOH film / adhesive / ON film / adhesive / CPP film (sealant layer), but not limited to these Various combinations of laminated films can be used instead of one.

In the constitution of the laminated film, the ON film is a biaxially oriented nylon film, the PET film is a biaxially oriented polyethylene terephthalate film, PP is polypropylene, L / LDPE is linear low density polyethylene, HDPE is high 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.

Since the adhesive between the film layers is usually laminated by the dry lamination method, the adhesive is 2
A known adhesive for dry lamination such as a liquid-curable polyurethane adhesive can be used. The anchor coat is a kind of primer coat that is pre-coated on the substrate film side to improve the adhesiveness when laminating the resin by extrusion coating.

When the ON film or PET film is used as the outermost layer in the constitution of the laminated film, it is used as a base material film for imparting mechanical strength, heat resistance, printability, etc. to the bag, and an intermediate layer. When used for
Mainly used to reinforce mechanical strength. When a biaxially stretched HDPE film or a biaxially stretched PP film is used for the intermediate layer, it is possible to increase the thickness of the laminated film, enhance its rigidity and mechanical strength, and at the same time reduce the water vapor permeability.

The aluminum foil, silica or alumina or aluminum vapor deposition layer, EVOH film, etc.
It is mainly laminated to provide gas barrier properties, and in addition to these, a coating layer of polyvinylidene chloride or a gas barrier material such as a polyacrylonitrile film can be laminated.

As the innermost sealant layer, L.LD
Two examples of PE film and CPP film were given, but L.LDPE film is excellent in stability of heat seal and resistance to contents, for example, stress cracking resistance against surfactants, so that beverages and other liquid materials It is especially suitable for packaging. Further, the CPP film is excellent in heat resistance and low odor, and is suitable for packaging contents that require these properties.

In addition to the above, in the sealant layer, depending on the contents to be filled, high-pressure LDPE, ethylene / α-olefin copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / ethylene Acrylic acid ester copolymers, ionomers, polyester resins and the like can be appropriately selected and used.

Particularly, an ethylene / α-olefin copolymer polymerized using a single-site catalyst such as a metallocene catalyst has a narrow molecular weight distribution and a stable copolymerization ratio. In addition to having excellent hot-sealing properties, it also has low odor properties, and has good heat sealing workability and stability, and is also suitable for packaging contents that require low odor properties.

When a laminated film in which at least paper is laminated as an intermediate layer is used as the laminated film, for example, a thin paper such as a label paper is additionally laminated inside the outermost layer of the laminated film having the above constitution. Alternatively, the paper itself may be used as a base material, and polyethylene or another plastic material may be laminated on both surfaces thereof. As a constitutional example of a laminated film using paper as a base material, for example, a constitution in which an LDPE layer / paper / LDPE layer is laminated in order from the outside, or LDPE layer / paper / LDPE layer / aluminum foil / adhesive / PET film / An example is a structure in which an anchor coat layer / LDPE layer is sequentially laminated.

Since the LDPE layer (sealant layer) is also provided on the outermost layer of the laminated film having such a structure, for example, a hole for drinking and sealing the hole at the top of the self-standing bag or the like. In the case of providing a sealing tape with a knob, by providing a heat-adhesive resin layer such as an LDPE layer on the innermost layer of the sealing tape, the hole for drinking can be easily sealed by the heat-sealing method. It is suitable because it can be stopped. In this case, when the sealing strength of the sealing tape is too strong, an anti-heat sealing agent or the like may be applied to the adhesive portion of the sealing tape to adjust the sealing strength. In addition, the sealing tape is easily broken not only on the outer surface of the mouth for drinking, but also on the inner surface, for example, a relatively thin LDPE single film or an aluminum foil laminated with LDPE. You may provide the sealing tape of the said structure.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically below with reference to the drawings. However, the present invention is not limited to the drawings unless the gist thereof is exceeded. In addition, the same reference numerals are used for parts having the same names in different drawings. FIG. 1 is a view for explaining the constitution of the first embodiment of the self-supporting bag of the present invention, (a) is a front view showing the constitution of the bag at an intermediate stage before forming the bottom portion, and (b) is FIG. 3 is a perspective view showing a configuration after forming a bottom portion and filling and sealing the contents. FIG. 2 is a view for explaining the structure of the second embodiment of the self-supporting bag of the present invention, (a) is a front view showing the structure of the bag at an intermediate stage before the bottom is formed, and (b) is FIG. 3 is a perspective view showing a configuration after forming a bottom portion and filling and sealing the contents. Further, FIG. 3 is a view for explaining the constitution of the third embodiment of the self-supporting bag of the present invention, and (a) shows the constitution when the tubular body at the intermediate stage of the production of the self-supporting bag is molded. In perspective view, (b) is
It is a front bird's-eye view which shows the structure after the filling and sealing of the contents.

The self-standing bag 100 shown in (b) of FIG. 1 is formed by using the bag of the three-side seal type shown in (a) of FIG. 1 as described above. 1
Is folded back to the inside of the bag so that it is folded inward at the folded portion 2, and the end edges on both sides are heat-sealed by the side seal portions 3 and 3, and the upper portion, that is, the upper seal portion 4 is Before filling the contents, we made a three-sided sealed bag that opens.
A jig is inserted through the opening at the top of the bag to expand the body into a rectangular tube shape to form a rectangular flat bottom surface at the bottom, and at this time, projecting portions formed on both sides of the bottom surface ( In this case, the triangular protruding portion) is flatly heat-sealed by the heat-sealing portion 5 to form the plate-like piece 6 protruding in the lateral direction.

By adopting such a constitution, the filling of the contents can be easily carried out from the opening in the upper part, and after the filling of the contents, the upper seal part 4 is heat-sealed to make it shown in FIG. The self-standing bag 100 having the configuration shown in FIG. Such a self-supporting bag 100 has a rectangular flat bottom surface reliably formed on the bottom, so that good self-supporting property is provided, and the protrusions formed on both sides of the bottom surface are heat-sealed parts 5. Since it is flatly heat-sealed and has a shape protruding laterally as the plate-like piece 6, the self-supporting property is assisted at this portion, and more stable self-supporting property is imparted. Further, since the outer shape of the self-standing bag 100 is a reverse taper shape from the bottom to the top, it is easy to hold. For example, it is filled with contents such as a beverage, and the top is opened for drinking. Even if you do, you can safely hold and drink the contents.

In the construction of the self-supporting bag 100, when it is not necessary to project the plate-like piece 6 in the lateral direction to assist the self-supporting property, the plate-like piece 6 may be folded under the bottom surface or upward. It is also possible to fold it up and fix it by using an adhesive such as hot melt on the bottom surface or side surface of the self-standing bag 100, or by heat bonding if heat bonding is possible. In this case, the bottom has a clean shape, so that the appearance and handleability can be further improved. Such a configuration of the bottom portion can be similarly adopted in the self-standing bag shown in FIGS. 2 and 3 below.

The self-supporting bag 200 shown in FIG. 2B is formed by using the pillow type bag shown in FIG. 2A, and the left and right sides of the laminated film 1 have a predetermined width. After being folded back inward, the folded back edge portions are heat-sealed by a back seal portion 7 in a palm-sealing type, and the back seal portion 7 is laid on one side, and then the lower edge portion is joined to the bottom seal portion 8
1 is heat-sealed to form a pillow-type bag in which the upper portion, that is, the portion of the upper seal portion 4 is opened before filling the contents, and from the opening portion at the upper portion of the bag, (a) in FIG. As in the case of the three-sided seal type bag shown in Fig. 3, a jig is inserted to spread the body into a rectangular tube shape to form a rectangular flat bottom surface at the bottom, and at this time, it is formed on both sides of the bottom surface. The protruding portion (in this case also, a triangular protruding portion) is flatly heat-sealed by the heat seal portion 5 to form the plate-like piece 6 protruding in the lateral direction.

By adopting such a constitution, the filling of the contents can be easily carried out from the opening in the upper part, and after the filling of the contents, the upper seal portion 4 is heat-sealed to make it shown in FIG. The self-standing bag 200 having the configuration shown in FIG. Like the self-supporting bag 100 shown in FIG. 1B, the self-supporting bag 200 as described above is provided with a rectangular flat bottom surface at the bottom, so that good self-supporting property is provided. Since the protruding portions formed on both sides of the bottom surface are flatly heat-sealed by the heat-sealing portion 5 and have a shape protruding laterally as the plate-shaped piece 6, the self-supporting property is assisted at this portion, More stable independence is given. Also, the outer shape of the self-standing bag 200 is reverse taper from the bottom to the top like the self-standing bag 100 shown in FIG. Even when the contents are filled and the upper part is opened for drinking, the contents can be held easily and safely by hand and the contents can be drunk.

Next, FIG. 3 is a view for explaining the constitution of the third embodiment of the self-supporting bag of the present invention, and (a) is the constitution when the intermediate stage cylindrical body of the self-supporting bag is molded. Is a perspective view showing
(B) is a front view showing the structure after filling and sealing the contents. The self-supporting bag 300 shown in (b) of FIG. 3 is filled with contents such as beverages and used when the contents are drunk.
The opening 11 for drinking mouth provided on the upper part of 00 is directly attached to the mouth so as to be hygienic and comfortable to drink.

Such a self-supporting bag 300 is shown in FIG.
A vertical, horizontal, diagonal bending ruled line 9 as shown in FIG. 2 or an auxiliary pushing ruled line 9 is provided, and a drinking hole 11 is provided at the center of the upper surface and a knob for sealing it. 1
A cylindrical body at an intermediate stage provided with a sealing tape 13 provided with 2 is heat-sealed at the body side seal portion 10 on the back side, and the cylindrical body is formed with a pressing rule 9 as follows. It can be easily manufactured by bending, heat bonding and molding.

Since such a self-standing bag 300 is provided with a hole 11 for a drinking mouth and a sealing tape 13 for sealing it, the thermal adhesiveness of the sealing tape 13 and its From the standpoint of stability of the opening function when peeling off and opening the hole 11 for a drinking mouth, and in particular, folding suitability by the pressing rule 9 when heat-sealing the side portion after filling the content, the laminated film to be used is , It is preferable that both surfaces have thermal adhesiveness, moderate thickness, rigidity, and bending suitability.
To do this, use at least a relatively thick paper as the base material,
It is preferable to use a laminated film in which a thermally adhesive resin layer such as an LDPE layer is laminated on both surfaces thereof.

In the method of forming the self-standing bag 300 from the tubular body, the side seal predetermining portion 3 is provided on one of the left and right sides of the intermediate stage tubular body shown in FIG. After vertically bending and diagonally pressing the ruled lines 9 so that the inner surfaces of ′ are in linear contact with each other, they are superposed and heat-bonded,
Fill the contents from the opening on the other side, then
Similar to the side portion, the pressing ruled line 9 is bent and heat-sealed to seal the opening, and among the triangular protrusions formed at the upper and lower corners on the left and right sides, the triangular protrusions on both lower sides are formed. The protrusions are flatly heat-sealed by the heat-sealing portions 5, 5 to form plate-like pieces 6, 6 protruding laterally on both sides of the rectangular flat bottom surface, and triangular protrusions on both sides of the upper portion. By returning to a flat shape and freeing it, as shown in FIG. 3B, a flat bottom having a rectangular bottom and laterally projecting plate-like pieces 6 formed on both sides thereof. , 6 and a hole 11 for drinking is provided in the central part of the upper part, and the hole 11 heats the sealing tape 13 having the knob 12 from the outside with the heat seal part 5. The self-standing bag 300 having a sealed structure can be manufactured.

The hole 11 for the mouthpiece is provided with a size suitable for the contents, and the sealing tape 13 provided with the knob 12 for sealing the hole 11 for the mouthpiece is It is preferable that the size is set to be slightly larger than the size that the human mouth comes into contact with, so that when the contents filled in the self-standing bag 300 are to be drunk, the knob 12 that seals the hole 11 for the mouth. Attach the sealing tape 13 with the knob 12
By pinching and peeling, the hole 11 for drinking can be easily opened. In addition, the opening 11 for the mouthpiece that has been opened is of an appropriate size, and even the area around the mouth that contacts the mouth is covered with the sealing tape 13 until it is opened, so it is contaminated. It is hygienic, and the contents can be taken hygienically and comfortably by directly opening the opened hole 11 for a drinking mouth.

Further, by adopting the above-mentioned structure, the self-supporting bag 300 is the self-supporting bag 1 shown in FIG. 1 and FIG.
As with Nos. 00 and 200, since a rectangular flat bottom surface is surely formed on the bottom, good self-supporting property is provided, and flat heat sealing is performed at both sides of the bottom surface by the heat seal portions 5 and 5. Since the plate-like pieces 6, 6 are formed so as to project in the lateral direction, the self-supporting property is assisted in this part,
More stable independence is given. Also, a self-standing bag 300
Regarding the outer shape, the self-supporting bag 1 shown in FIGS.
Similar to 00 and 200, it has a reverse taper shape from the bottom to the top, so it is easy to hold by hand, and as described above, it is filled with the contents such as beverages, and the hole for the mouth is provided at the top. Even when the mouth is directly attached to 11 for drinking, it can be safely held, and the contents can be taken hygienically and comfortably.

[0039]

Industrial Applicability As described above in detail, according to the present invention, a bag capable of safely hermetically packaging beverages and other liquid contents, which is excellent in self-sustainability and can be used like a standing pouch. It is not necessary to prepare multiple laminated films such as front and rear wall film and bottom film, and at the bag making stage, a bag making machine such as a three-sided seal type bag, a four-sided seal type bag, or a pillow type bag can be used. Also, by performing forming and filling of the bottom and the body and heat sealing using a dedicated molding, filling and sealing device, it is possible to provide a self-supporting bag that can be easily manufactured at low cost with high productivity. Play.

[Brief description of drawings]

FIG. 1 is a view for explaining the structure of a first embodiment of a self-supporting bag of the present invention, (a) is a front view showing the structure of a bag at an intermediate stage before the bottom is formed, and (b) is (b). FIG. 3 is a perspective view showing a configuration after forming a bottom portion and filling and sealing the contents.

FIG. 2 is a view for explaining the constitution of the second embodiment of the self-supporting bag of the present invention, (a) is a front view showing the constitution of the bag at an intermediate stage before forming the bottom portion, and (b) is (b). FIG. 3 is a perspective view showing a configuration after forming a bottom portion and filling and sealing the contents.

FIG. 3 is a view for explaining the constitution of the third embodiment of the self-supporting bag of the present invention, and FIG. 3 (a) is a perspective view showing the constitution when a tubular body of an intermediate stage of the self-supporting bag is molded, (B) is a front view showing the structure after filling and sealing the contents.

[Explanation of symbols]

1 laminated film 2 Folded part 3 Side seal part Planned 3'side seal 4 Upper seal part 5 Heat seal part 6 plate-shaped pieces 7 Back seal part 8 Bottom seal part 9 pushing ruled lines 10 Body seal part 11 Holes for drinking 12 picking section 13 Sealing tape 100, 200, 300 freestanding bags

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masayasu Hayashi             1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo             Dai Nippon Printing Co., Ltd. F term (reference) 3E064 AA04 AA05 BA01 BA21 BB03                       EA04 FA04

Claims (3)

[Claims] 1. A bag obtained by heat-sealing an edge portion of a laminated film into a bag shape, wherein a lower portion of the bag is spread back and forth,
A rectangular flat bottom is formed on the bottom, and the protrusions formed on both sides of the bottom are flatly heat-sealed,
A self-supporting bag, wherein the bag is provided with self-supporting property by forming a plate-like piece protruding in the lateral direction. 2. The self-supporting bag according to claim 1, wherein the laminated film is formed of a laminated film in which at least paper is laminated on the intermediate layer. 3. The plate-shaped pieces formed on both sides of the bottom surface are fixed to the bottom surface or the side surface of the bag by being folded under the bottom surface or folded up. The self-supporting bag described in 1 or 2.