JP2000025785A - Standing pouch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a standing pouch in which there is less possibility in occurrence of a pin hole or a crack or a peeling-off state at a bottom sheet, it has a superior self-standing state and has a superior appearance. SOLUTION: A bottom sheet 53 has a fine belt-like melting section 52 in which the sheet is folded to form its valley portion at its central part, both sides are spaced apart by a predetermined distance near the folding line to form a folded shape with its sectional shape being an M, and the inner surface layers are melted and adhered along the folding line. The sheet is inserted between a rectangular front sheet 54 and a rectangular rear sheet 55 with their inner surface layers being oppositely faced Lo each other and the three sides except an upper end edge acting a content filling sealing port are melted and adhered to form a pouch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a standing pouch. More specifically, the present invention relates to a standing pouch in which the bottom can be expanded and self-supported by filling and sealing the contents.

[0002]

2. Description of the Related Art Filling and sealing bags (pouches) obtained by fusing side edges of a laminated sheet having a heat-fusible resin layer on an inner surface layer are as follows.
Since the material is inexpensive and can be manufactured by heat fusion, the manufacturing cost can be suppressed, and it is lightweight and compact, and the distribution cost of filled and sealed products can be low and handling is easy. When the contents are paste-like or liquid materials, the bag can be rolled up and discharged without leaving any contents. Liquids such as shampoos, refillable sealed bags for liquid detergents for washing and kitchen use, viscous fluids such as seasoned miso, nutrients for infusion, juices, etc. It is often used for filling and sealing packaging of products in various fields such as tea, powdered food and the like. In particular, a standing pouch having a bottom portion has, in addition to the above-mentioned advantages, a relatively simple structure and can be filled and sealed in a large amount, it is self-supporting, so that it can be easily displayed at a store, and is set up after opening. For example, when the contents such as liquids remain, it is possible to prevent the contents from leaking out, and therefore, it is easy to store the contents without refilling in a dedicated container. It has been used for packaging.

FIG. 26 is a plan view showing an example of a conventional standing pouch, and FIG.
It is shown in FIG. The standing pouch (200) has a bottom sheet (2) between a rectangular front sheet (201) and a back sheet (202) in which a heat-adhesive resin layer as an inner layer is opposed.
03) is folded in the center at the center, and the heat-adhesive resin layer of the inner surface layer (203a) is made of the front sheet (201) and the back sheet (2).
02) so as to face the inner surface layers (201a) and (202a), and the upper edge (20) serving as a content filling sealing port is provided.
Except for 1b) and (202b), the three sides are formed by fusing.

[0004] This standing pouch (200)
For example, it may be manufactured as follows. First, the notch (204) provided on the side edge (203c) of the bottom sheet (203) is aligned and mountain-folded to form a fold (205). Then, the bottom sheet (203) is attached to the front sheet (2).
01) and the back sheet (202), and their lower edges (203d) and (203d) are respectively connected to the lower edge (201d) of the front sheet and the lower edge (202) of the back sheet.
d) and superimpose. Then, the three sides except the upper edges (201b) and (202b) of the front sheet and the back sheet are fused.

As a result, the upper edges (201b), (202)
From b) to the fold (205) position of the bottom sheet (203), the inner layer (201a) of the front sheet and the back sheet (201a), (2)
02a) are side edges (201c) on both side edges,
(202c) and the linear portion of the fusion boundary line (206) are fused. Below the position of the fold (205) of the bottom sheet (203), the inner layer (201a) of the front sheet and the inner layer (203a) of the bottom sheet opposed thereto are on both sides of the arc-shaped portion of the fusion boundary line (206). Edge (201c), (203
c) and the lower edges (201d) and (203d), and similarly, the inner layer (202a) of the back sheet and the inner layer (203a) of the bottom sheet facing the lower sheet have a fusion boundary line (203). 206) and both side edges (202c), (203)
c) and the lower edge (202d), (203d), and the notch (20) of the bottom sheet (203).
In part 4), the front sheet (201) and the back sheet (202) are fused (see FIG. 27).

With this structure, the bottom sheet (20
3) Below the fold (205), the rigidity of the standing pouch is increased, and the bottom sheet (20)
Since the outer surface layers (203f) of 3) are not fused to each other, when the content is filled from the content filling sealing opening (207), the crease (2) as shown in FIG.
05), the bottom sheet (203) swells downward and spreads out like a ship bottom, and the standing pouch (20)
0) can be made independent.

For the front sheet, the back sheet, and the bottom sheet, a film in which an inner layer made of a heat-adhesive resin such as polyethylene, a gas barrier intermediate layer made of aluminum foil or the like, and an outer layer made of polyamide or the like are often used. ing. A standing pouch in which such a laminated film is mountain-folded at the center as the bottom sheet is filled with contents from the contents filling sealing opening, when the middle part of the fold goes down and the bottom sheet swells downward and spreads like a ship bottom, Bending that crosses the folds of the bottom sheet or irregular wrinkles near the folds causes excessive stress concentration, causing cracks in the folds and films near the folds, aluminum foil Pinholes are generated in the gas barrier intermediate layer such as the above, or the intermediate layer and the inner surface layer or the outer surface layer are easily separated. Further, after filling the contents and sealing the filling sealing opening, when the contents move inside due to handling of the bag or the like, the repetitive action that the bottom sheet spreads and narrows at the fold is a fold. In addition to working, the bending which crosses the fold moves along the fold or wrinkles near the fold, thereby causing excessive stress concentration due to the bending or wrinkling as described above. Cracks occur in the film or in the vicinity thereof, pinholes occur in the gas barrier intermediate layer such as aluminum foil, or the intermediate layer and the inner surface layer or the outer surface layer are easily peeled off. . Such cracks, pinholes, and peeling are particularly likely to occur when a thick sheet is used. If cracks, pinholes, or peeling occur, the gas barrier properties will decrease, and depending on the contents, they will oxidize or deteriorate, making them unsuitable for long-term storage. In addition, even if it is not such a bottom sheet of a laminated film, even if it is a bottom sheet of a single layer film, there is a fault that cracks and wrinkles are easily generated in the bottom sheet for the same reason.

In the case of a standing pouch in which lightweight contents are hermetically filled or a standing pouch whose contents have been reduced by use, creases are formed in the bottom sheet when the standing pouch is repeatedly lifted or made to stand on its own. The folds are folded inward from the spread state of the bottom sheet because the rigidity is increased due to the fact that the front sheet and the bottom sheet and the back sheet and the bottom sheet are fused. It is easy to return to a narrow state, and the stability of the standing pouch may fall, resulting in poor stability.

In order to prevent cracks, pinholes and peeling from occurring in the bottom sheet, it is conceivable to use a thin and flexible bottom sheet. However, in this case, the fusion between the front sheet and the bottom sheet and the back sheet and the bottom sheet is considered. The rigidity of the place where it is worn will be insufficient, and the independence as a standing pouch will be impaired, and the appearance will also deteriorate. To prevent this, if the front and back sheets are thickened, the rigidity of the front and back sheets makes it easier for the bottom sheet to return from the widened bottom sheet to the narrow bottom width where the folds are folded inward. The stability may be poor and it may collapse.

[0010]

In view of the above situation, as a result of intensive research, the present inventors have found that a predetermined narrow band-shaped fused portion is formed along a fold formed by bending at the center. When the bottom sheet is used for a standing pouch, when the bottom sheet expands and spreads downward by filling the contents, the narrow band-shaped fused portion of the bottom sheet acts to help the bottom sheet spread, The risk of causing wrinkles or the like near the folds or folds that intersect with the folds of the sheet is reduced, and that wrinkles or the like do not occur near the folds or the folds that cross the folds of the bottom sheet even during handling. It has a resistance effect and the stiffness due to the fusion of the front sheet and the bottom sheet, and the back sheet and the bottom sheet. It gave reinforcing action to resist the tendency such easily return to the narrow state of being folded on the bottom sheet, to obtain a knowledge that leads to not impair the self-supporting,
The present invention has been completed, and an object of the present invention is to provide a standing pouch which has a low risk of occurrence of pinholes, cracks or peeling in a bottom sheet, and has good self-supporting properties and good appearance. And

[0011]

In order to solve the above-mentioned problems, a standing pouch according to the present invention has a bottom portion made of a sheet having a heat-fusible resin layer provided on an inner surface layer, and the bottom portion has a central portion. The outer surface layers are fused or bonded to each other in the vicinity of a fold formed by mountain folding in claim 1. When the contents are filled in such a standing pouch and the bottom swells downward and spreads, a portion formed by fusing or bonding the outer surface layers in the vicinity of the fold serves to help the bottom expand, and the bottom fold is formed. And reduces the risk of causing wrinkles and the like near the bends and folds that intersect, and also performs a resistance action such that wrinkles and the like do not occur near the bends and folds that intersect with the folds at the bottom even during handling, In addition, a bottom reinforcing effect is produced. In this standing pouch, as the specific form of fusing or bonding the outer surface layers in the vicinity of the fold, various forms such as a narrow band, a dot, and a parallel line along the fold can be adopted. Of these, the bottom portion is preferably formed by linearly fusing or bonding the outer surface layers with a predetermined width along the fold line (claim 2).

Further, the standing pouch has a bottom portion made of a sheet having an inner surface layer provided with a heat-fusible resin layer, and the bottom portion is formed such that the outer surface layers of a pair of sheets are arranged along one edge. (3) It may be characterized by being linearly fused and integrated with a predetermined width from (2). When the contents are filled into such a standing pouch and the bottoms are swelled downward and spread, the outer surface layers of the pair of sheets are linearly fused with a predetermined width from one end along one end, and integrated. Part serves to assist in the expansion of the bottom, reducing the risk of bending or wrinkles near the bottom fold and crossing the bottom fold during handling. A resistance action such as not causing wrinkles or the like in the vicinity of a sharp bend or a fold is provided, and a reinforcement action of the bottom is further generated.

The standing pouch has a bottom portion made of a sheet having an inner surface layer provided with a heat-fusible resin layer, and the bottom portion is separated by a predetermined distance from a fold formed by valley folding at the center. Further, the inner surface layers which are respectively mountain-folded on both sides and folded into an M-shaped cross section are fused to each other (claim 4). When the contents are filled in such a standing pouch and the bottom part swells downward and spreads, it is mountain-folded on both sides separated by a predetermined distance in the vicinity of a fold formed by valley folding in the center and folded into an M-shaped cross section. The part where the inner surface layers are fused together serves to assist in the expansion of the bottom, reducing the risk of bending or wrinkling near the fold that crosses the bottom fold, and In this case, a resistance action such as a bend that crosses the fold at the bottom and a wrinkle or the like near the fold is not generated, and a reinforcing action at the bottom is also generated. In this standing pouch, as a specific form of fusing the inner surface layers to each other, various forms such as a narrow band, a point, a parallel line, etc. can be adopted along the fold.
Of these, the bottom is preferably formed by linearly fusing the inner surface layers with a predetermined width along the fold line (claim 5).

Further, the standing pouch has a bottom portion made of a sheet having an inner surface layer provided with a heat-fusible resin layer, and the bottom portion is formed such that the inner surface layers of a pair of sheets are one end edge along one end edge. , And are integrated in a straight line with a predetermined width from each other, and are mountain-folded and folded into an M-shaped cross section on both sides separated by a predetermined distance in the vicinity of the fusion portion. 6). When such a standing pouch is filled with contents and the bottom swells downward and spreads,
The inner surface layers of the pair of sheets are linearly fused and integrated with a predetermined width from the one edge along the one edge, and are mountain-folded on both sides separated by a predetermined distance in the vicinity of the fused portion to form an M-shaped cross section. The fused part in the folded part has the function of assisting the expansion of the bottom part, reducing the risk of bending or wrinkling near the fold that crosses the bottom fold, and also during handling. It acts as a resistance such as not to bend or cross wrinkles near the fold at the bottom, and also to reinforce the bottom.

[0015]

Embodiments of the present invention will be described below, and the present invention will be described in more detail. Of course, the present invention is not limited by the following embodiments. FIG. 1 shows an example of a sheet used in the present invention. FIG.
The sheet (1) shown in FIG.
b) a laminated film comprising an outer layer (1c),
The inner layer (1a) is a low-density polyethylene film which is a heat-fusible resin, the intermediate layer (1b) is an aluminum foil, and the outer layer (1
c) is made of a stretched polyamide film which is a heat-fusible resin having a higher melting point than the inner surface layer (1a). Intermediate layer (1b)
Is for imparting gas barrier properties and the like to the laminated film.

FIG. 2 is an exploded perspective view showing one embodiment of the standing pouch (10) of the present invention using such a sheet. The standing pouch (10)
A strip-shaped fusion bonding portion (1) in which outer surface layers (12c) are fused along a fold (11) formed by mountain folding at the center.
The bottom sheet (12) having 3) is inserted between the rectangular front sheet (14) and the back sheet (15) with the inner surface layers facing each other, and the upper edge (14d) serving as a content filling sealing opening;
The three sides except (15d) are formed by fusion.

The standing pouch (10) may be manufactured, for example, as follows. First, a notch (1) provided in a side edge (12f) of the bottom sheet (12).
6) and (16) are matched to form a fold (11) by mountain-folding, and then polyamide is fused by ultrasonic sealing to form a narrow band between the outer surface layers (12c) of the bottom sheet (12). Is formed. The bottom sheet (12) thus formed is replaced with the front sheet (14).
Between the lower sheet (15) and the lower sheet (15),
(12e) is aligned with the lower edge (14e) of the front sheet and the lower edge (15e) of the back sheet and superimposed, excluding the upper edges (14d) and (15d) of the front sheet and the back sheet.
One is fused at the heat fusion temperature of low density polyethylene.

As a result, the upper edges (14d), (15d)
To the fold (11) position of the bottom sheet (12), the inner surface layers (14a) and (15a) of the front sheet and the back sheet are fused to the side edges (14f) and (15f) on both sides. It is fused between the linear portions of (16). Below the fold (11) position, the inner surface layer (14a) of the front sheet and the inner surface layer (12a) of the bottom sheet face each other, and the side edge (14f) extends to the lower side of the narrow band-shaped fused portion (13). ,
Between (12f) and the linear portion of the fusion boundary line (17), from the lower side to the lower edge (14e) of the narrow band-like fusion portion (13);
Until 2e), the arc portion of the fusion boundary line (17) and both side edges (14f), (12f) and the lower edge (14e), (1
2e) and likewise the inner layer (1
5a) and the inner surface layer (12a) of the bottom sheet are opposed to each other and the side edges (15f), (1
2f) and the linear portion of the fusion boundary line (17), from the lower side to the lower edge (15e) of the narrow band-like fusion portion (13), (12)
Until e), the arcuate portion of the fusion boundary line (17) and both side edges (1)
5f), (12f) and lower edge (15e), (12
e), the front sheet (14) and the back sheet (15) are fused at the notch (16) of the bottom sheet (12), and the standing pouch (10) shown in FIG. ) Is formed. FIG. 4 shows a vertical partial sectional view of the center of the standing pouch (10). The position, number, and size of the cutouts (16) of the bottom sheet (12) are determined as appropriate, and the shape is shown as a semicircle, but is not limited to this.

In this standing pouch (10), since the outer surface layers are not fused together except for the narrow band-like fused portion (13) between the outer surface layers (12c) of the bottom sheet, the content filling sealing port is provided. When the contents are filled from below, due to the weight of the contents, etc., the middle part of the narrow band-shaped fusion portion (13) is lowered, and the bottom sheet (12) is swelled downward and spreads like a ship bottom.
At this time, the narrow band-shaped fused portion (13) between the outer surface layers (12c) of the bottom sheet is excluding a portion fused and sandwiched between the front sheet (14) and the back sheet (15) at both ends. In the vicinity of the inside from both ends, the twisting is performed so as to change from the vertical state to the horizontal state, and the middle part lies along the bottom sheet (12) as shown in FIG. Thus, when the contents are filled in the bag portion from the contents filling sealing opening of the standing pouch and the bottom portion expands downward and expands, the narrow band-shaped fusion portion acts to help the bottom sheet expand, and the bottom sheet has Reduces the risk of bending or wrinkling near the fold that crosses the fold, and after filling the contents and sealing the filling sealing opening, crosses the fold of the bottom sheet even during handling of the standing pouch. Such a resistance action as to prevent wrinkles or the like from being generated in the vicinity of the bend or the fold is obtained, and further, a reinforcing action of the bottom sheet is generated, and the appearance is good without impairing the independence.

The band-like fusion portion (13) between the outer surface layers (12c) of the bottom sheet serves the same function as described above when filling or handling the contents in the standing pouch. It suffices if, for example, FIG.
As shown in the figure, a slight unfused portion (1
8), a fusion-bonded strip having a small radius as shown in (b), arranged in a line along the fold as shown in (b), and a parallel fold as shown in (c). An appropriate shape such as one in which fusion wires are juxtaposed can be adopted.

The standing pouch may be a single sheet as shown in FIG. The standing pouch (20) formed of the single sheet (19) has a narrow band shape in which the outer surface layers (22c) are fused together along a fold (21) formed by mountain folding at the center of the sheet (19). And a front sheet portion (2) formed by valley folding at both ends following the bottom sheet portion (22).
4) and the back sheet portion (25) are folded and overlapped, and the upper edges (24d) and (25) serving as the content filling sealing opening are provided.
The three sides except d) are formed by fusion.

Such a standing pouch (20)
May be manufactured, for example, as follows. First,
The notch (26) provided on the side edge (22f) of the bottom sheet portion (22) is aligned and mountain-folded to form a fold (21), and then the polyamide is fused by ultrasonic sealing, A narrow width fusion portion (23) between the outer surface layers (22c) of the bottom sheet portion is formed. Then, the front sheet portion (24) and the back sheet portion (25) are each valley-folded and folded with respect to the bottom sheet portion (22), and the front sheet portion (2) is folded.
4), the upper edge (24d) of the back sheet portion (25), (25
The three sides excluding d) are fused at the heat fusion temperature of low density polyethylene. FIG. 8 is a central vertical partial cross-sectional view of the standing pouch (20). In this standing pouch (20), the same structures as those shown in FIGS. 2 to 5 are denoted by the same reference numerals, and detailed description is omitted. Further, when filling the contents from the contents filling sealing opening or when handling the standing pouch (20) after sealing the contents filling sealing opening, a narrow band-shaped fusion bonding portion of the bottom sheet portion (22) ( The function 23) is the same as that described in detail with reference to FIGS.

The outer surface layer (22) of the bottom sheet portion (22)
c) The narrow band-like fusion parts (23) between each other are not limited to those shown in FIG. 7, and may be, for example, those which are fused in a narrow band form except for a small unfused part along the fold. There may be. Needless to say, an appropriate shape such as one in which fusion small circles having a predetermined radius are arranged in a line along a fold, or one in which fusion lines parallel to the fold are arranged in parallel can be adopted. Further, the bottom sheet is formed by applying an adhesive in place of the bottom sheet in which the outer surface layers are fused together along the crease formed by mountain folding at the center as described above, or the fused portion of the bottom sheet. It may be a bonded portion.

The standing pouch (30) shown in FIG. 9 has a pair of bottom sheets (31), (31c) having outer layers (31c), and (31c) having one end edge (31d);
A bottom sheet (32) is used, which is fused along one end from (31d) into a narrow band having a predetermined width and is integrated. In this standing pouch (30), the bottom sheet (32) is inserted between a rectangular front sheet (33) and a back sheet (34) whose inner surface layers are opposed to each other, and an upper end serving as a content filling sealing opening. It is formed by fusing the three sides except the edges (33d) and (34d).

The standing pouch (30) may be manufactured, for example, as follows. First, an outer layer (31c) of a pair of bottom sheets (31), (31),
(31c) The notch (3
5) and (35) are matched. And the bottom sheet (3
1) and (31), the polyamides, which are the outer surface layers, are fused by ultrasonic sealing along one edge (31d) and (31d) from one edge to a narrow band having a predetermined width to form a fused portion (36). Form and integrate. Next, the obtained bottom sheet (3
2) between the front sheet (33) and the back sheet (34),
The lower edges (32e) and (32e) are aligned with the lower edge (33e) of the front sheet and the lower edge (34e) of the back sheet, respectively, and overlapped.
d) The three sides excluding (34d) are fused at the heat fusion temperature of low density polyethylene. FIG. 10 shows a central vertical partial cross-sectional view of the obtained standing pouch (30). In this standing pouch (30), the same structures as those shown in FIGS. 2 to 5 are denoted by the same reference numerals, and detailed description thereof will be omitted. Also, when filling the contents from the contents filling sealing port,
Alternatively, the function of the narrow band-shaped fused portion (36) of the bottom sheet (32) in handling the standing pouch (30) after sealing the content filling sealing port has been described in detail with reference to FIGS. The description is omitted because it is the same.

As shown in FIG. 11, a sheet (43) folded into a front sheet portion (41) and one bottom sheet portion (42), a back sheet portion (44) and the other bottom portion. It may be a standing pouch (47) in which a valley-folded sheet (46) is combined with a sheet section (45) for use.

The narrow band-shaped fused portion provided on the bottom sheet is not limited to the one formed by fusing the outer layers, and may be the one formed by fusing the inner layers. Good. According to this, the standing pouch can be formed only by performing the fusion at the fusion temperature of the inner surface layer, which is preferable.

FIG. 12 is a perspective exploded view of a standing pouch having a narrow band-like fusion portion where the inner layers of the bottom sheet are fused to each other. The standing pouch (50)
The folds (51) formed by valley folding in the center are each mountain-folded on both sides separated by a predetermined distance and are folded into an M-shaped cross section.
A bottom sheet (53) having a narrow band-like fusion portion (52) fused along 1) is formed on inner surface layers (54a) and (55a).
Front sheet (54) and back sheet (5)
5) is formed by fusing at three sides except for the upper edges (54d) and (55d), which are inserted between 5) and serve as a content filling sealing port.

The standing pouch (50) may be manufactured, for example, as follows. First, a notch (5) provided on a side edge (53f) of the bottom sheet (53) is provided.
6) are aligned and valley-folded to form a fold (51), and then fused at a heat-sealing temperature of low-density polyethylene to form a narrow band-like fusion between the inner surface layers (53a) of the bottom sheet (53). A part (52) is formed. FIG. 13 is a side view of this state.
This is indicated by the solid line in FIG. Then, the bottom sheet (53) formed in this manner is mountain-folded on both sides at a predetermined equidistant distance in the vicinity of the fusion portion (52), and folded into an M-shaped cross section (FIG. 13A). (See the two-dot chain line). The cross section M
The position of folding in the shape of a letter may be the edge of the fused portion (52) as shown in FIG. Next, the bottom sheet (53) folded into an M-shaped cross section is attached to the front sheet (5).
4) and the back sheet (55), the lower edge thereof (53).
e) and (53e) are aligned with and overlapped with the lower edge (54e) of the front sheet (54) and the lower edge (55e) of the back sheet (55), respectively.
d) and three sides excluding (55d) are fused at a heat fusion temperature of low density polyethylene.

As a result, the upper edges (54d), (55d)
Of the bottom sheet (53) from the crest (5
1) Up to the position, the front sheet (54) and the back sheet (55)
Inner layers (54a) and (55a) are fused between the side edges (54f) and (55f) and the linear portion of the fusion boundary line (57) on both side edges. Mountain folded crease (5
1) Below the position, the inner layer (54a) of the front sheet and the inner layer (53a) of the bottom sheet opposed thereto are formed by the arc-shaped portion of the fusion boundary line (57) and both side edges (54f), (53f). ,
And the lower edge (54e), (53e),
Similarly, the inner surface layer (55a) of the back sheet and the inner surface layer (53a) of the bottom sheet facing the inner surface layer (55a) are formed by an arc-shaped portion of the fusion boundary line (57) and both side edges (55f), (53f), and a lower edge. (55e) and (53e), and the front sheet (54) and the back sheet (55) are fused at the notch (56) of the bottom sheet (53). Further, the valley-folded fold (51) of the bottom sheet (53) is shifted from the position of the mountain-folded fold (58) of the bottom sheet (53).
The inner layers (53a) of the bottom sheet (53) include a narrow band-like fusion portion (52) on both side edges up to the position, and the linear portion of the fusion boundary line (57) and the side edge (53f). Is fused between FIG. 14 shows a standing pouch (50).
2 shows a vertical partial cross-sectional view of the center.

The position, number and size of the cutouts (56) of the bottom sheet (53) are determined as appropriate, and the shape is shown as a semicircle, but is not limited to this. Also, the inner surface layers (53a) of the bottom sheet (53) are shown in FIG.
As shown in FIG. 3 (b), it may be fused to the mountain-folded position.

In this standing pouch (50), since the outer surface layers (53c) of the bottom sheet (53) are not fused to each other, when the contents are filled from the contents-filled dense contents-filled sealing port, the contents are filled. Due to its own weight or the like, the middle portion of the narrow-width fused portion (52) is lowered, and the bottom sheet (53) swells downward and spreads like a ship bottom. At that time, the bottom sheet (5
3) A narrow band-shaped fusion portion (52) between the inner surface layers (53a).
Are the front sheet (54) and the back sheet (5)
Except for the part that was sandwiched and fused by 5), the twist was made so that it changed from vertical to horizontal near the inside from both ends, and the middle part laid down along the bottom sheet (53) as shown in FIG. Becomes Thereby, when the contents are filled into the bag portion from the contents filling sealing opening of the standing pouch and the bottom portion expands downward and spreads, the narrow width fusion portion acts to assist the opening of the bottom sheet, and the bottom sheet is formed. To reduce wrinkles and the like in the vicinity of the folds and bends that intersect with the folds of the folds.Also, after filling the contents and sealing the filling sealing opening, it also intersects with the folds of the bottom sheet during handling of the standing pouch. In this case, the sheet has a resistance effect of preventing wrinkles and the like from being generated in the vicinity of the folds and folds, and also has a reinforcing effect on the bottom sheet, so that the independence is not impaired and the appearance is good.

The inner layer (53a) of the bottom sheet (53)
The band-like fusion portion (52) may be one that fulfills the same function as described above during filling or handling of the contents into the standing pouch. For example, FIG. As shown in the figure, a small band is fused from the fold (51), leaving a small unfused portion (52); (b)
An appropriate shape can be adopted, such as one in which small fusion circles having a predetermined radius are arranged in a line along the fold as shown in FIG. .

As shown in FIG. 17, both ends of the overlapped portion of the bottom sheet (53) having an M-shaped cross section are cut out in an arc shape to form notches (59), and the front sheet (54) and the back sheet (55) are provided. ) May be fused at the side edges. The notches (59) at both ends of the overlapping portion of the bottom sheet (53) having an M-shaped cross section are set so as to be located between the side edge (53f) of the bottom sheet and the arc portion of the fusion boundary line (57). . By doing so, the front sheet (54) and the back sheet (55)
The bottom sheet (53) by fusion at the notch (59)
The both ends of the overlapping portion having an M-shaped cross section are sealed, so that the possibility of leakage of the liquid or paste-like content can be further reduced.

The standing pouch may be a single sheet as shown in FIG. The standing pouch (70) formed by the single sheet (69) is folded at the center of the sheet (69) into valleys at the center thereof and is crest-folded on both sides at predetermined equal distances in the vicinity of a fold (71). Folded into an M shape,
A bottom sheet portion (73) having a narrow band-like fusion portion (72) in which the inner surface layers (73a) and (73a) are fused along the fold (71), and the bottom sheet portion (73) is continued. The front sheet portion (7
4) and the back sheet part (75) are folded and overlapped, and the upper edges (74d) and (75) serving as the contents filling and sealing opening are provided.
The three sides except d) are formed by fusion.

Such a standing pouch (70)
May be manufactured, for example, as follows. First,
The notches (76) provided on the side edges (73f) of the bottom sheet portion (73) are aligned and valley-folded to form a fold (71), and then fused at a heat-sealing temperature of low-density polyethylene. Then, a narrow band-shaped fused portion (72) between the inner surface layers (73a) of the bottom sheet portion is formed. The fusion portion (72) is fused from the valley-folded fold (71). Then, the bottom sheet portion (7
3) Mountain-folding is performed on both sides of the predetermined distance in the vicinity of the fused portion (72), and folded into an M-shaped cross section. Then, the cross section M
The front sheet portion (74) and the back sheet portion (75) are folded in a valley-fold manner with respect to the bottom sheet portion (73) folded in the shape of a letter, and folded, and the upper edge (74) of the front sheet portion and the back sheet portion is formed.
d) Three sides except (75d) are fused at the heat fusion temperature of low-density polyethylene. FIG. 19 shows a central vertical partial cross-sectional view of this standing pouch (70). In this standing pouch (70), the same structures as those shown in FIGS. 12 to 15 are denoted by the same reference numerals, and detailed description thereof will be omitted. In addition, when filling the content from the content filling sealing opening or when handling the standing pouch (70) after the sealing of the content filling sealing opening, a narrow band-like fusion portion of the bottom sheet portion (73) ( 7
The function 2) is the same as that described in detail with reference to FIGS.

The inner surface layer (73) of the bottom sheet portion (73)
a) The narrow band-like fusion parts (72) between each other are not limited to those shown in FIG. 18 and may be, for example, those which are fused in a narrow band form except for a small unfused part along the fold. There may be. Needless to say, an appropriate shape such as one in which fusion small circles having a predetermined radius are arranged in a line along a fold, or one in which fusion lines parallel to the fold are arranged in parallel can be adopted.

Further, the standing pouch (80) shown in FIG. 20 has a pair of bottom sheets (81), (81a) having inner layers (81a), (81a) having one edge (81d),
(81d), it is integrated at one end edge from a fusion zone (82) fused in a narrow band shape with a predetermined width, and is mountain-folded on both sides separated by a predetermined distance near the fusion zone (82). Cross section M
A bottom sheet (83) folded in a letter shape is used. In this standing pouch (80), the bottom sheet (83) is inserted between a rectangular front sheet (84) and a back sheet (85) with the inner surface layer facing each other, and the upper end serving as a content filling sealing opening. It is formed by fusing the three sides except the edges (84d) and (84d).

The standing pouch (80) may be manufactured, for example, as follows. First, a pair of bottom sheets (81), an inner surface layer (81a) of (81),
(81a) The notch (8
6) and (86) are matched. And the bottom sheet (8
1) The low-density polyethylenes, which are the inner layers of (81), are heat-fused along one edge (81d), (81d) into a narrow band having a predetermined width from one edge to be integrated. Then, the bottom sheet (83) thus formed is mountain-folded at both sides thereof at a predetermined distance in the vicinity of the fusion portion (82), and folded into an M-shaped cross section. Next, the bottom sheet (83) folded into an M-shaped cross section is placed between the front sheet (84) and the back sheet (85) at the lower edges (83e), (83).
e) are aligned with the lower edge (84e) of the front sheet and the lower edge (85e) of the back sheet, respectively, and overlapped. Three sides except for the upper edges (84d) and (84d) of the front sheet and the back sheet are made of low-density polyethylene. At a heat fusion temperature of. FIG. 21 shows a central vertical partial cross-sectional view of the obtained standing pouch (80). In this standing pouch (80), the same structures as those shown in FIGS. 12 to 15 are denoted by the same reference numerals, and detailed description is omitted. In addition, when the contents are filled from the contents filling sealing opening, or when the standing pouch (80) after the contents filling sealing opening is sealed is handled, the narrow band-like fusion portion (82) of the bottom sheet (83) is used. ) Are the same as those described in detail with reference to FIGS.

As shown in FIG. 22, a sheet (93) folded into a front sheet part (91) and one bottom sheet part (92), a back sheet part (94) and the other bottom part. A standing pouch (97) in which a sheet (96) folded in a valley and a sheet portion (95) for use may be combined.

The present invention is not limited to the above-described embodiment, and various forms are possible. For example, the fusion of the front sheet, bottom sheet, and back sheet in the lower part of the standing pouch is shown in FIG.
May be adopted. FIG. 23 (a) shows a case where a fusion portion having a predetermined width is provided along the side edge and the lower edge, and FIG. 23 (b) further shows a portion from the fold end of the bottom sheet to the lower edge. It is provided with an inclined fusion portion having a predetermined width toward it. FIG. 23 (c) can be adopted when it is formed from a single sheet, in which a fused portion of a predetermined width is provided along the side edge.

The fusing of the front sheet and the back sheet at the upper part of the standing pouch may be performed as shown in FIG. FIG. 24 (a) is obtained by fusing the corners of the front sheet and the back sheet except for the part that becomes the outflow passage (98), and is suitable for pouring a liquid material or a paste-like material. . FIG. 24 (b) shows a spout (9) in which the corners of the front sheet and the back sheet are cut off obliquely and caps are provided.
9) is inserted and fused between the front sheet and the back sheet. FIG. 24C shows a zipper (100) attached to the inner surfaces of the front sheet and the back sheet.

The fusing of the front sheet and the back sheet at the intermediate body of the standing pouch may be performed as shown in FIG. FIG. 25 (a) shows the formation of an arc-shaped fused portion toward the inside of the bag in the fusion of the side edges of the front sheet and the back sheet, and FIG. 25 (b) shows the formation of a constriction. The front sheet and the back sheet are fused along the side edge. In these standing pouches, the corners are shown as being sharp, but this is not a limitation. If the corners are cut off in an arc shape, the corners will become holes in the standing pouch during handling. This is preferable because there is no possibility of opening the opening.

According to the standing pouches of the various embodiments described above, a standing pouch having good self-sustainability and good appearance can be obtained without increasing the thickness of the front and back sheets, and the cost of material can be reduced. The production cost can be reduced, which is economical.

In the above embodiment, the standing pouch using the same three-layer laminated film as the front sheet, the back sheet, and the bottom sheet has been described. However, the present invention is not limited to this, and even if the bottom sheet is a different kind of film. Good. Further, a laminate film of three or more layers or a laminate film of two layers may be used, and further, various types such as a single-layer film having an inner surface coated with a heat-adhesive synthetic resin. Needless to say, can be adopted. Film materials include thermoplastic resin, paper, cellophane,
Various things such as aluminum foil can be adopted. Examples of the thermoplastic resin include low-density polyethylene, linear low-density ethylene-α-olefin copolymer, linear ultra-low-density ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer, and ethylene. -Ethyl acrylate copolymer,
Ionomers, ethylene-acrylic acid copolymers, ethylene-methacrylic acid copolymers, ethylene-methyl methacrylate copolymers, ethylene polymers polymerized by a methacrylate catalyst, ethylene-vinyl alcohol copolymer, polyvinyldene chloride, polypropylene, propylene System polymers, polystyrene, styrenic polymers, polycarbonates, polyamides, polyesters and / or modified products of these polymers. The film may be a stretched or unstretched version of the above material.

In order to obtain a gas barrier property and a light shielding property, it is preferable to use an aluminum foil, which is generally used as an intermediate layer.

Among the films, the inner surface layer of the standing pouch has a low-melting-point low-density polyethylene, a linear low-density ethylene-α-olefin copolymer, and a linear ultra-low-density ethylene-α-olefin copolymer. And ethylene-vinyl acetate copolymer. As the outer layer, polyamide or the like having a higher melting point than the inner layer is preferable. For the fusion of these inner layers, a fusion means suitable for the material to be used may be appropriately employed, and examples thereof include heat fusion, ultrasonic sealing, and dielectric sealing.

[0048]

EXAMPLES Next, examples will be shown together with comparative examples, and will be described in more detail. Example 1 A low-density polyethylene film having a thickness of 80 μm was used as an inner layer, an aluminum foil having a thickness of 9 μm was used as an intermediate layer, and a laminated film made of a biaxially stretched polyamide having a thickness of 25 μm was used as an outer layer. A standing pouch having a bottom sheet formed in an M-shaped cross section as shown in FIG. As the front sheet and the back sheet, those having a width of 128 mm and a length of 255 mm were used. A bottom sheet having a width of 128 mm and a bottom width of 85 mm was used. The width of the narrow band-shaped fused portion of the bottom sheet was 2.5 mm, and the distance from the central valley fold to the mountain fold was 4 mm. . The formation of a narrow band-like fused portion in the bottom sheet, and the heat fusion of the front sheet, the back sheet and the bottom sheet in three directions are 1
Performed at 70 ° C.

[0049] 100 pieces of the obtained standing pouches were prepared, filled with water from the content filling sealing port, and the upper edge was set at 1.
When the bottom sheet was heat-sealed at 60 ° C. and the condition of the bottom sheet was observed with a magnifying glass, no wrinkles or pinholes were found in any of the sheets. In addition, each standing pouch was laid down, and then the state of the bottom sheet after repeating the operation of self-supporting 100 times was observed with a magnifying glass, and any wrinkles, pinholes, aluminum foil and the inner or outer layer were observed. No peeling was observed.

Comparative Example 1 Using the same film as in Example 1, a conventional standing pouch having a bottom sheet as shown in FIG. 26 was formed. Width 1 as bottom sheet
It is the same as Example 1 except that the one having a width of 28 mm and the bottom width of 80 mm was used and the center was folded in a mountain. Thermal fusion of the front sheet, back sheet, and bottom sheet was performed at 170 ° C.

[0051] 100 standing pouches were prepared and filled with water through the content filling and sealing opening.
The sheet was heat-sealed at 60 ° C., and the condition of the bottom sheet was observed with a magnifying glass. As a result, only one sheet had wrinkles and pinholes. Except for the standing pouch, the remaining 99 standing pouches were laid down, and then the state of the bottom sheet after repeating the operation of independence 100 times was observed with a magnifying glass.
32 pieces of the aluminum foil and the inner layer or the outer layer were peeled off.

[0052]

Since the present invention is configured as described in detail above, it has the following effects. It has a bottom portion made of a sheet provided with a heat-fusible resin layer on the inner surface layer, and the bottom portion is formed such that the outer surface layers are fused or bonded to each other in the vicinity of a fold formed by mountain folding at the center. According to the characteristic standing pouch,
When the contents are filled and the bottom swells downward and expands, the portion where the outer surface layers are fused or adhered in the vicinity of the fold,
Acts to help the bottom expand, reduces the risk of bending or intersecting the bottom fold or wrinkles near the fold, and also the bending or fold crossing the bottom fold during handling. It has a resistance function of preventing wrinkles and the like from being generated in the vicinity, and also has a reinforcing effect on the bottom portion, so that the appearance is good without impairing the independence.

Further, it has a bottom portion made of a sheet in which a heat-fusible resin layer is provided on the inner surface layer, and the bottom portion is formed such that the outer surface layers of a pair of sheets are linearly arranged at a predetermined width from one end edge along one end edge. According to the standing pouch characterized by being fused and integrated, when the contents are filled and the bottom part swells downward and spreads, the outer surface layers of the pair of sheets are one end along one edge. The part that is linearly fused and integrated with a predetermined width from the edge acts to assist in expanding the bottom, and there is a risk of bending or crossing the crease near the crease at the bottom. In addition, during handling, it performs a resistance action such as not to bend or cross wrinkle near the bottom fold even during handling, furthermore, it has a bottom reinforcing action, it does not impair independence and looks good Is also good.

Further, it has a bottom portion made of a sheet having a heat-fusible resin layer provided on the inner surface layer, and the bottom portion is formed on both sides at a predetermined distance apart from a fold formed in the center by a valley fold. According to the standing pouch, wherein inner layers which are folded and folded into an M-shaped cross section are fused together, when the contents are filled and the bottom part expands downward and expands, it is folded in the center at the bottom. A portion formed by fusing the inner surface layers, each of which is mountain-folded and folded into an M-shaped cross section on both sides separated by a predetermined distance in the vicinity of the formed fold, serves to assist in the expansion of the bottom portion. It has the effect of reducing the risk of bending that intersects with the fold or wrinkling near the fold, and also prevents the occurrence of bending that intersects with the bottom fold or wrinkling near the fold even during handling. And further results in the reinforcing effect of the bottom,
Good looking without sacrificing independence.

Further, there is provided a bottom portion made of a sheet in which a heat-fusible resin layer is provided on the inner surface layer, and the bottom portion is formed such that the inner surface layers of a pair of sheets are linearly arranged at a predetermined width from one end edge along one end edge. The standing pouch is characterized in that the standing pouch is fused and integrated into a shape, and is mountain-folded on both sides separated by a predetermined distance in the vicinity of the fused portion and folded into an M-shaped cross section. When the bottom is swelled downward and spreads, the inner surface layers of the pair of sheets are linearly fused and integrated at a predetermined width from the one edge along the one edge, and separated by a predetermined distance in the vicinity of the fused portion. The cross section M
The fused portion in the portion folded in the shape of a letter serves to assist in the expansion of the bottom, reducing the risk of causing wrinkles or the like near the bend or fold crossing the fold of the bottom,
In addition, even during handling, it has a resistance effect such as not to bend or cross wrinkles near the folds at the bottom portion, and also has a reinforcing effect at the bottom portion, which does not impair the independence and has a good appearance.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a sheet used in the present invention.

FIG. 2 is an exploded perspective view showing one embodiment of a standing pouch of the present invention.

FIG. 3 is a front view of the standing pouch shown in FIG. 2;

FIG. 4 is a central vertical partial sectional view of the standing pouch shown in FIG. 3;

5 is a central vertical partial cross-sectional view illustrating a schematic state in which a bottom sheet of the standing pouch shown in FIG. 3 is spread.

FIG. 6 is a front view showing a modification of the bottom sheet of the standing pouch shown in FIG.

FIG. 7 is an exploded perspective view showing another embodiment of the standing pouch of the present invention.

FIG. 8 is a central vertical partial sectional view of the standing pouch shown in FIG. 7;

FIG. 9 is an exploded perspective view showing still another embodiment of the standing pouch of the present invention.

FIG. 10 is a central vertical partial sectional view of the standing pouch shown in FIG. 9;

FIG. 11 is a central vertical partial sectional view of a standing pouch according to still another embodiment of the present invention.

FIG. 12 is an exploded perspective view showing still another embodiment of the standing pouch of the present invention.

13A is a side view of a bottom sheet of the standing pouch shown in FIG. 12, and FIG. 13B is a modified example thereof.

FIG. 14 is a central vertical partial sectional view of the standing pouch shown in FIG. 12;

FIG. 15 is a central vertical partial cross-sectional view illustrating a schematic state in which the standing pouch shown in FIG. 12 is spread.

FIG. 16 is a front view showing a further modification of the bottom sheet of the standing pouch shown in FIG.

FIG. 17 is a partial front view showing another example of the standing pouch shown in FIG. 12;

FIG. 18 is an exploded perspective view showing still another embodiment of the standing pouch of the present invention.

19 is a vertical partial sectional view of the center of the standing pouch shown in FIG. 18.

FIG. 20 is an exploded perspective view showing still another embodiment of the standing pouch of the present invention.

FIG. 21 is a central vertical partial sectional view of the standing pouch shown in FIG. 20.

FIG. 22 is a central vertical partial sectional view of a standing pouch according to still another embodiment of the present invention.

FIG. 23 is a partial front view showing a modification of the lower portion of the standing pouch of the present invention.

FIG. 24 is a partial front view showing a modification of the upper part of the standing pouch of the present invention.

FIG. 25 is a partial front view showing a modification of the central portion of the standing pouch of the present invention.

FIG. 26 is a front view showing an example of a conventional standing pouch.

FIG. 27 is an exploded perspective view of the standing pouch shown in FIG. 26.

FIG. 28 is a perspective view of the standing pouch shown in FIG. 26 in a state where contents are filled.

[Explanation of symbols]

 10, 50 Standing pouch 11, 51 Fold 12, 53 Bottom sheet 13, 52 Fused part 14, 54 Front sheet 15, 55 Back sheet 16, 56 Notch

Continued on front page F term (reference) 3E064 AB25 AB26 BA01 BA07 BA17 BA22 BA27 BA29 BA30 BA36 BA38 BA54 BB03 BC08 BC18 EA18 EA23 EA30 FA04

Claims (6)

[Claims] 1. A standing pouch having a bottom portion made of a sheet provided with a heat-fusible resin layer on an inner surface layer, wherein the outer layer is fused to each other in the vicinity of a fold formed by mountain-folding at the center. Or a standing pouch characterized by being adhered. 2. The standing pouch according to claim 1, wherein the bottom portion is formed by linearly fusing or bonding the outer surface layers with a predetermined width along the fold line. 3. A standing pouch having a bottom portion made of a sheet having a heat-fusible resin layer provided on an inner surface layer, wherein the bottom portion has a predetermined width from one end edge of the pair of sheets along one edge thereof. A standing pouch characterized by being linearly fused and integrated with the above. 4. A standing pouch having a bottom portion formed of a sheet having a heat-fusible resin layer provided on an inner surface layer, wherein the bottom portion is located on both sides separated by a predetermined distance in the vicinity of a fold formed by valley folding at the center. A standing pouch, wherein inner plies that are each folded in a mountain and folded into an M-shaped cross section are fused together. 5. The standing pouch according to claim 4, wherein the bottom portion is formed by linearly fusing the inner surface layers with a predetermined width along the fold line. 6. A standing pouch having a bottom portion made of a sheet having a heat-fusible resin layer provided on an inner surface layer, wherein the bottom portion is formed such that the inner surface layers of a pair of sheets have a predetermined width from one edge along one edge. Are fused linearly and integrated with
A standing pouch characterized by being mountain-folded on both sides separated by a predetermined distance in the vicinity of a fused portion and folded into an M-shaped cross section.