JP2014213891A - Self-supporting bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-supporting bag capable of improving self-standing property with a simple structure, capable of reducing cost and capable of improving convenience.SOLUTION: The self-supporting bag comprises: a front side sheet 2; a rear side sheet 3; and a bottom face sheet 4, the sheets are formed of a lamination layer film 30 having a thermal adhesion layer 35 on their inner face side, respectively. The bottom face sheet 4 is folded into half and is sandwiched between lower parts of the front side sheet 2 and the rear side sheet 3, then the sheet peripheral edges are subjected to thermal adhesion for obtaining the self-supporting bag 1 which is a bottom gusset type. The self-supporting bag 1 further comprises a folding back part 12 formed by folding back a side edge thermal adhesion part 11 formed by performing thermal adhesion to side edges of the front and rear side sheets 2, 3. The folding back part 12 is fastened to the front side sheet 2 or the rear side sheet 3 by one or more fastening parts 13.

Description

  The present invention relates to a self-supporting bag of the bottom gusset type.

  A bottom gusset type self-standing bag (standing pouch) is widely used as a container for liquid contents such as seasonings, liquor, and detergents. A conventional free-standing bag is disclosed in Patent Document 1. This self-supporting bag is formed by thermally bonding a front sheet, a back sheet and a bottom sheet made of a laminated film.

  The bottom part of the self-supporting bag is thermally bonded to the front sheet and the back sheet, respectively. Above the bottom sheet of the self-standing bag, the opposing peripheral portions of the front sheet and the back sheet are thermally bonded, and a spout forming a spout is sandwiched between the front sheet and the back sheet at the upper end and is thermally bonded. .

  An air bag extending in the vertical direction is provided at the side edge thermal bonding portion formed at one side end of the self-standing bag. The airbag is formed by filling a non-fused portion provided in the side edge thermal bonding portion with gas from the airbag inlet and then fusing and sealing the airbag inlet.

  The self-supporting bag is firmly self-supporting when the amount of contents is large, but the upper part is easily bent when the contents are reduced and the thickness is reduced. The self-supporting bag of Patent Document 1 can improve folding and self-supporting property by providing an airbag extending vertically.

Japanese Patent No. 4683899 (pages 9 to 14, FIG. 1)

  However, according to the self-supporting bag described in Patent Document 1, a step of filling the airbag with gas and a step of fusing and sealing the airbag inlet while paying attention so that the gas does not escape are required. For this reason, the manufacturing process of the self-supporting bag is complicated, and the cost of the self-supporting bag is increased.

  In addition, when the contents are used up and the self-supporting bag is discarded, it is difficult to fold if gas remains in the airbag. For this reason, it is necessary to cut the airbag with a blade or the like to remove the gas, and then fold and discard the bag.

  In addition, when pouring the contents from the spout, it is difficult to hold the free-standing bag filled with the contents with one hand, and the free-standing bag will slide down unless it is gripped so that the fingers are firmly applied to the airbag. May end up. For this reason, it is necessary to pour the contents while holding the free-standing bag with one hand while holding the other hand from below and holding it with both hands, and there is a problem that the convenience of the free-standing bag is poor.

  An object of the present invention is to provide a self-supporting bag that can improve self-supporting property with a simple structure, reduce costs, and improve convenience.

  In order to achieve the above object, the present invention includes a front sheet, a back sheet and a bottom sheet each formed of a laminated film having a thermal adhesive layer on the inner surface side, and the bottom sheet is folded in two to form the front sheet and A bottom gusset-type self-standing bag sandwiched between the lower portions of the back side sheets and thermally bonded to the sheet peripheral edges, wherein the side edges of the front side sheet and the back side sheet are thermally bonded. The folded portion is fixed to the front sheet or the back sheet by one or a plurality of fixing portions.

  According to this configuration, one side edge thermal bonding portion is folded toward, for example, the front side sheet to form a folded portion. The folded portion is fixed to the surface of the front sheet or the inner surface of the back sheet through the front sheet by the fixing portion. The folded portion improves the rigidity of one side edge of the self-standing bag. In addition, the contents can be poured while holding the self-supporting bag with one hand by placing a finger on the folded portion while avoiding the fixed portion.

  Further, in the self-supporting bag having the above-described configuration, the first and second hole portions that are opposed to each other by folding the folded portion are formed in the front sheet, and the thermal adhesive layer of the back sheet facing the first hole portion The fixing portion is formed by thermally bonding the heat-bonding layer of the back sheet facing the two holes.

  In the self-supporting bag having the above-described configuration, the first and second holes facing each other when the folded portion is folded are formed on the outer cover layer on the outer surface side of the thermal adhesive layer of the front sheet, and the first hole The fixing portion is formed by thermally bonding the thermal adhesive layer facing the portion and the thermal adhesive layer facing the second hole.

  Further, the present invention is characterized in that in the self-supporting bag configured as described above, the fixing portion is provided on the side edge thermal bonding portion.

  Further, the present invention is characterized in that, in the self-supporting bag having the above-described configuration, the fixing portion is provided inside the side edge thermal bonding portion.

  In the self-supporting bag having the above-described configuration, the side edge thermal bonding portion has a protruding portion protruding sideways, and the folded portion is formed by folding the protruding portion.

  Further, in the self-supporting bag having the above-described configuration, the side edge thermal bonding portion includes a plurality of divided portions that divide the outer end portion in the vertical direction, and the folded portion is formed by folding between the divided portions. It is characterized by.

  Further, the present invention is characterized in that in the self-supporting bag having the above-described configuration, a pour spout is provided at one upper corner, and the folded portion is provided at the side edge thermal bonding portion on the side where the pour spout does not exist.

  According to the configuration of the present invention, since the folded portion obtained by folding the side edge thermal bonding portion is fixed to the front sheet or the back sheet by the fixing portion, the rigidity of the side edge of the self-standing bag is improved. Thereby, the self-supporting bag with high self-supporting property can be formed with a simple structure and process, and the cost of the self-supporting bag can be reduced. Further, when the self-supporting bag is discarded, it can be easily folded, and the contents can be poured while holding the self-supporting bag with one hand by placing a finger on the folded portion. Therefore, the convenience of a self-supporting bag can be improved.

The perspective view which shows the self-supporting bag of 1st Embodiment of this invention. The front view which shows the self-supporting bag of 1st Embodiment of this invention AA sectional view of FIG. The schematic sectional drawing which shows the layer structure of the laminated | multilayer film which forms the self-supporting bag of 1st Embodiment of this invention. The front view which shows the state before the folding of the folding part of the self-supporting bag of 1st Embodiment of this invention. BB sectional view of FIG. The perspective view which shows the state at the time of pouring the contents of the self-supporting bag of 1st Embodiment of this invention. The front view which shows the self-supporting bag of 2nd Embodiment of this invention The front view which shows the state before the folding of the folding | turning part of the self-supporting bag of 2nd Embodiment of this invention. Top sectional drawing which shows the folding | turning part of the self-supporting bag of 3rd Embodiment of this invention The front view which shows the self-supporting bag of 4th Embodiment of this invention The front view which shows the state before the folding of the folding | turning part of the self-supporting bag of 4th Embodiment of this invention. The front view which shows the self-supporting bag of 5th Embodiment of this invention The front view which shows the state before the folding of the folding | turning part of the self-supporting bag of 5th Embodiment of this invention. The front view which shows the self-supporting bag of 6th Embodiment of this invention CC sectional view of FIG. Top sectional drawing which shows the folding | turning part of the self-supporting bag of 7th Embodiment of this invention

<First Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a perspective view and a front view of the self-supporting bag of the first embodiment. FIG. 3 is a cross-sectional view taken along the line AA in FIG. The self-supporting bag 1 has a front side sheet 2, a back side sheet 3, and a bottom sheet 4 made of a laminated film. The front side sheet 2 and the back side sheet 3 form the body portion of the free standing bag 1, and the bottom sheet 4 forms the bottom surface of the free standing bag 1. For convenience, one of the laminated films disposed on the front and rear surfaces of the body portion of the self-supporting bag 1 is the front side sheet 2 and the other is the back side sheet 3.

  The bottom sheet 4 is folded under the horizontal dotted line D in FIG. 2 and sandwiched between the lower part of the front sheet 2 and the lower part of the back sheet 3. The front side sheet 2 and the back side sheet 3 are thermally bonded to each other at the upper edge thermal bonding portion 9 and the side edges are thermally bonded to the side edge thermal bonding portions 10 and 11, respectively. The periphery of the bottom sheet 4 is thermally bonded to the front sheet 2 and the back sheet 3 at the bottom heat bonding portion 8. Thereby, the self-supporting bag 1 of the bottom gusset type which can be self-supporting is formed.

  In the front side sheet 2 and the back side sheet 3, a corner cut portion 5 is formed at a position corresponding to the upper right corner in FIG. 2. The corner cutting part 5 is heat-bonded at the upper edge heat bonding part 9 so as to sandwich a spout made of synthetic resin, and a spout 6 for pouring the contents is formed by the spout. The spout 6 is composed of a main body 6a that is thermally bonded to the front sheet 2 and the back sheet 3, and a screw-type cap 6b that is detachably attached to the main body 6a.

  The side edge thermal bonding part 11 on the side where the spout 6 of the front side sheet 2 and the back side sheet 3 does not exist is provided with a folded part 12 that is turned back toward the front side sheet 2 as will be described in detail later. The folded portion 12 is fixed by a plurality of fixing portions 13 that are provided apart in the vertical direction.

  FIG. 4 is a schematic cross-sectional view showing the layer structure of the laminated film that forms the front sheet 2, the back sheet 3, and the bottom sheet 4. The laminated film 30 is provided with a jacket layer 31 on the outer surface side of the thermal adhesive layer 35. For example, a polyethylene terephthalate (PET) film 32, an aluminum foil 33, and a stretched nylon film 34 are laminated in this order from the outer surface side with an adhesive.

  The polyethylene terephthalate film 32 is formed with a thickness of 12 μm, for example, and can perform beautiful printing with high printability and can impart heat resistance during thermal bonding. The aluminum foil 33 is formed with a thickness of 9 μm, for example, and prevents intrusion of oxygen and water vapor. The stretched nylon film 34 is formed with a thickness of 15 μm, for example, and can improve the puncture resistance of the self-supporting bag 1. In addition, the inner surface side of the polyethylene terephthalate film 32 is printed to form a design such as a product name.

  The thermal adhesive layer 35 disposed on the innermost layer of the laminated film 30 is formed of, for example, a polyethylene (PE) film having a thickness of 100 μm. The heat bonding between the laminated films 30 is performed by heating and pressurizing the heat bonding layers 35 together.

  FIG. 5 is a front view showing a state before the folded portion 12 of the self-supporting bag 1 is formed. One side edge thermal bonding portion 11 of the self-supporting bag 1 is provided with a protruding portion 14 extending vertically and protruding sideways. The folded portion 12 (see FIG. 2) is formed by folding the protruding portion 14 toward the front sheet 2 at a folding position 20 indicated by a one-dot chain line extending vertically in the drawing.

  Note that a crease or a perforation may be provided at the bending position 20. Further, the protruding portion 14 may be folded back into a curved shape at the folding position 20.

  A first hole portion 15 and a second hole portion 16 that are opposed to each other when the folded portion 12 is formed through the front side sheet 2 are provided on the side edge thermal bonding portion 11 with the folding position 20 interposed therebetween. A plurality of first hole portions 15 and second hole portions 16 are provided at the same interval in the vertical direction.

  FIG. 6 is a cross-sectional view taken along the line BB in FIG. In the figure, for easy understanding, reference numerals 31 ′ and 35 ′ denote the outer cover layer 31 and the thermal bonding layer 35 of the front sheet 2. A first hole 15 is provided in the protrusion 14 that is folded back at the folding position 20, and the second hole 16 faces the first hole 15 by the folding of the protrusion 14. The spot-like fixing portion 13 is formed by thermal bonding between the thermal adhesive layer 35 of the back sheet 3 facing the first hole 15 and the thermal adhesive layer 35 of the back sheet 3 facing the second hole 16.

  The rigidity of one side edge of the self-supporting bag 1 is improved by the folded portion 12 extending in the vertical direction. For this reason, even when the content is reduced, the free-standing bag 1 is prevented from being bent, and the self-standing property of the free-standing bag 1 can be improved with a simple structure. At this time, it is not necessary to perform gas sealing of the airbag as in the prior art, and the self-supporting bag 1 having high self-supporting property can be obtained by a simple process of folding the protruding portion 14 and thermally bonding the fixing portion 13.

  Moreover, when discarding the self-supporting bag 1, it is not necessary to cut the airbag as in the prior art, and it can be easily folded and discarded.

  FIG. 7 is a perspective view showing a state when pouring the contents of the self-supporting bag 1. The user puts his / her finger F on the folded portion 12 between the plurality of fixing portions 13 to hold the self-supporting bag 1, and the contents are poured with the spout 6 provided on the top of the self-supporting bag 1 facing downward. Thereby, the self-supporting bag 1 can be easily held with one hand and the contents can be poured.

  In addition, when the fixing | fixed part 13 is provided in one place, the self-supporting bag 1 can be hold | maintained with one hand by hooking the finger F on the upper and lower folding | turning part 12 straddling the fixing | fixed part 13. FIG.

  According to the present embodiment, the folded portion 12 that is the folded side edge thermal bonding portion 11 is fixed by the fixing portion 13 through the first and second hole portions 15 and 16, so that the rigidity of the side edge of the self-standing bag 1 is improved. To do. Thereby, the self-supporting bag 1 with high self-supporting property can be formed with a simple structure and process, and the cost of the self-supporting bag 1 can be reduced. Further, when the self-supporting bag 1 is discarded, it can be easily folded, and the contents F can be poured while holding the self-supporting bag 1 with one hand by placing the finger F on the folded portion 12. Therefore, the convenience of the self-supporting bag 1 can be improved.

  Further, in order to thermally bond the heat bonding layers 35 of the back sheet 3 facing the first and second holes 15 and 16 provided in the front sheet 2, the fixing part 13 is easily formed and the folded part 12 is fixed. can do.

  Further, since the fixing portion 13 is provided on the side edge thermal bonding portion 11, leakage of contents through the first and second hole portions 15 and 16 can be prevented even if the fixing portion 13 is peeled off.

  Moreover, since the side edge heat bonding part 11 has the protrusion part 14 which protrudes to the side, and the folding | returning part 12 is formed by folding the protrusion part 14, the folding | returning part 12 can be formed easily. At this time, you may provide the recessed part of the same shape as the protrusion part 14 in the side end facing the protrusion part 14 of the trunk | drum of the self-supporting bag 1. FIG. Thereby, when many front side sheets 2 and back side sheets 3 are cut out from the raw film of the laminated film 30, the protrusion part 14 and a recessed part adjoin, and the front side sheet 2 and the back side sheet 3 can be cut out efficiently.

  Moreover, the spout 6 is provided at one corner of the upper part of the self-supporting bag 1, and the folded portion 12 is provided on the side edge heat bonding portion 11 on the side where the spout 6 does not exist. For this reason, when the finger F is put on the folded portion 12, the spout 6 naturally faces downward, and the liquid content can be easily poured from the spout 6.

Second Embodiment
Next, FIGS. 8 and 9 are a front view of the self-supporting bag 1 of the second embodiment and a front view showing a state before the folded portion 12 is formed. For convenience of explanation, the same reference numerals are assigned to the same parts as those in the first embodiment shown in FIGS. In the present embodiment, the folded portion 12 is formed so as to protrude sideways. Other parts are the same as those in the first embodiment.

  One side edge thermal bonding portion 11 is provided with a protruding portion 14 that extends vertically and protrudes laterally, and a bending position 20 is provided on the protruding portion 14. When the protruding portion 14 is folded back toward the front side sheet 2 at the folding position 20, the folded portion 12 is formed to protrude sideways from the side edge of the self-standing bag 1.

  Therefore, in addition to the same effects as those of the first embodiment, the user can easily recognize that the handle 12 is configured to hang the finger F because the folded portion 12 protrudes to the side.

<Third Embodiment>
Next, FIG. 10 is a top cross-sectional view of the folded portion 12 of the self-supporting bag 1 of the third embodiment, and shows the same cross section as FIG. 6 described above. For convenience of explanation, the same reference numerals are given to the same parts as those in the first embodiment shown in FIG. This embodiment is different from the first embodiment in the configuration of the fixing portion 13 that fixes the folded portion 12. Other parts are the same as those in the first embodiment.

  The protruding portion 14 that is folded back at the folding position 20 is fixed by a hot melt 17 provided on the facing front sheet 2. Thereby, a plurality of spot-like fixing portions 13 are provided in the vertical direction.

  According to the present embodiment, the folded-back portion 12 that is the folded-back side edge heat-bonding portion 11 is fixed by the fixing portion 13 formed by the hot melt 17, so that the same effect as in the first embodiment can be obtained. In the second embodiment, the fixing portion 13 may be formed by the hot melt 17 in the same manner.

<Fourth embodiment>
Next, FIG. 11 has shown the front view of the self-supporting bag 1 of 4th Embodiment. For convenience of explanation, the same reference numerals are assigned to the same parts as those in the first embodiment shown in FIGS. In the present embodiment, a split portion 18 (see FIG. 12) is provided on one side edge thermal bonding portion 11, and the protruding portion 14 (see FIG. 5) is omitted. Other parts are the same as those in the first embodiment.

  One side edge thermal bonding part 11 of the self-supporting bag 1 has an inner projecting part 19 projecting the inner edge inward. The folded portion 12 is formed to have a lateral width of about ½ of the lateral width of the side edge thermal bonding portion 11 on the inner protruding portion 19, and is fixed by the fixing portion 13.

  FIG. 12 is a front view showing a state before the folded portion 12 of the self-supporting bag 1 is formed. One side edge thermal bonding portion 11 of the self-standing bag 1 is provided with a plurality of divided portions 18 that divide the outer end portion in the vertical direction, and a folded piece 12 ′ is formed between the divided portions 18. The dividing portion 18 is formed by a wedge-shaped notch that is open at one end. The dividing portion 18 may be formed by a notch having another shape, or the dividing portion 18 may be formed by a slit-like cut.

  Further, the folded piece 12 ′ of the side edge thermal bonding portion 11 is folded at a folding position 20 that connects the inner ends of the upper and lower divided portions 18 up and down. A first hole portion 15 and a second hole portion 16 that are opposed to each other when the folded portion 12 is formed through the front side sheet 2 are provided on the side edge thermal bonding portion 11 with the folding position 20 interposed therebetween.

  The folded piece 12 'is folded at the folding position 20 to form the folded portion 12 (see FIG. 11). Further, the spot-like fixing portion 13 is formed by the thermal bonding between the thermal adhesive layer 35 of the back side sheet 3 facing the first hole 15 and the thermal adhesive layer 35 of the back side sheet 3 facing the second hole 16. .

  According to this embodiment, the same effect as that of the first embodiment can be obtained. Further, the side edge thermal bonding portion 11 has a plurality of dividing portions 18 that divide the outer end portion in the vertical direction, and the folded portion 12 is formed by folding between the divided portions 18, so that the folded portion 12 can be easily formed. can do. At this time, since the protruding portion 14 (see FIG. 5) does not protrude from the side edge thermal bonding portion 11, a large number of the front side sheets 2 and the back side sheets 3 can be efficiently cut out from the original film of the laminated film 30. In addition, you may form the adhering part 13 with the hot melt 17 (refer FIG. 10) similar to 3rd Embodiment.

<Fifth Embodiment>
Next, FIG. 13 has shown the front view of the self-supporting bag 1 of 5th Embodiment. For convenience of explanation, the same reference numerals are given to the same parts as those in the fourth embodiment shown in FIGS. In the present embodiment, a label portion 22 is provided on the side edge thermal bonding portion 11. Other parts are the same as in the fourth embodiment.

  The label portion 22 protrudes laterally from the side end of the folded portion 12, and a label 22a composed of a character string such as “handle” is printed. Thereby, a user can recognize easily that the return part 12 comprises the handle which hangs fingers F.

  FIG. 14 is a front view showing a state before the folded portion 12 of the self-supporting bag 1 is formed. A slit 23 having upper and lower ends disposed on a bending position 20 extending vertically is formed on the side edge thermal bonding portion 11. The slit 23 is provided so as to protrude toward the inner edge of the side edge thermal bonding portion 11 with respect to the bending position 20. The label 22 a is provided on the inner back sheet 3 (see FIG. 3) surrounded by the slits 23.

  When the folded piece 12 'between the divided portions 18 is folded at the folding position 20, the label portion 22 inside the slit 23 is inverted together with the folded piece 12'. Thereby, the label part 22 is formed continuously from the folded part 12 and protrudes from the side end of the folded part 12.

  According to the present embodiment, in addition to the same effects as those of the fourth embodiment, since the label portion 22 that protrudes laterally from the side end of the folded portion 12 is provided, the user configures that the folded portion 12 constitutes a handle. It can be easily recognized.

  The slit 23 may protrude toward the outer edge of the side edge thermal bonding portion 11 with respect to the bending position 20. Accordingly, the folded piece 12 ′ is folded away from the label portion 22 at the folding position 20. At this time, the horizontal width of the folded piece 12 ′ at the portion where the label portion 22 is cut out by the slit 23 is narrowed, and the strength of the folded portion 12 is lowered. For this reason, it is more desirable to form the slit 23 so as to protrude toward the inner edge of the side edge thermal bonding portion 11 with respect to the bending position 20.

<Sixth Embodiment>
Next, FIG. 15 has shown the front view of the self-supporting bag 1 of 6th Embodiment. For convenience of explanation, the same reference numerals are given to the same parts as those in the fourth embodiment shown in FIGS. In the present embodiment, the fixing portion 13 of the folded portion 12 is provided on the inner side (within the content filling region) than the side edge thermal bonding portion 11. Other parts are the same as in the fourth embodiment.

  Similar to the fourth embodiment, the folded portion 12 is formed by folding folded pieces 12 ′ (see FIG. 12) between the plurality of divided portions 18 that divide the outer edge of the side edge thermal bonding portion 11. At this time, the folded portion 12 is formed to have a lateral width larger than about ½ with respect to the lateral width of the side edge thermal bonding portion 11 on the inner projecting portion 19, and is a fixing portion 13 inside the side edge thermal bonding portion 11. It is fixed.

  FIG. 16 shows a cross-sectional view taken along the line CC of FIG. Similar to FIG. 6 described above, reference numerals 31 ′ and 35 ′ denote the outer cover layer 31 and the thermal bonding layer 35 of the front sheet 2. The first hole portion 15 and the second hole portion 16 penetrating the front side sheet 2 are provided with the folding position 20 interposed therebetween, and face each other by folding the folded piece 12 '. The second hole portion 16 is formed inside the inner edge of the side edge heat bonding portion 11.

  The spot-like fixing portion 13 is formed by thermal bonding between the thermal adhesive layer 35 of the back sheet 3 facing the first hole 15 and the thermal adhesive layer 35 of the back sheet 3 facing the second hole 16. At this time, the heat bonding layer 35 ′ of the front sheet 2 inside the side edge heat bonding portion 11 and the heat bonding layer 35 of the back sheet 3 are heat bonded simultaneously with the fixing portion 13, and an annular heat is formed around the fixing portion 13. An adhesive portion 21 is formed. A region E through which the contents can pass is formed between the side edge heat bonding portion 11 and the annular heat bonding portion 21.

  According to this embodiment, the same effect as that of the fourth embodiment can be obtained. Moreover, since the adhering portion 13 is provided on the inner side of the side edge thermal bonding portion 11, the lateral width of the folded portion 12 can be increased. Therefore, it is possible to hang the finger F deeply on the folded-back portion 12, and to prevent the finger F from falling off more reliably. In addition, you may provide the label part 22 (refer FIG. 13) similar to 5th Embodiment.

  In addition, a fixing portion 13 that thermally bonds the heat bonding layers 35 of the back sheet 3 facing the first and second holes 15 and 16 is provided on the inner side of the side edge heat bonding portion 11, and the periphery of the fixing portion 13. An annular thermal bonding portion 21 is formed in Therefore, the leakage of contents through the second hole 16 can be prevented by the annular heat bonding portion 21.

  Next, FIG. 17 is a top cross-sectional view of the folded portion 12 of the self-supporting bag 1 of the seventh embodiment, and shows the same cross section as FIG. 16 described above. For convenience of explanation, the same reference numerals are given to the same parts as those in the sixth embodiment shown in FIGS. 15 and 16 described above. Similarly to FIG. 16 described above, reference numerals 31 ′ and 35 ′ denote the coating layers 31 and the heat bonding layers 35 of the front sheet 2. In the present embodiment, the fixing portion 13 provided on the inner side of the side edge thermal bonding portion 11 is formed by thermal bonding of the thermal bonding layer 35 ′ of the front sheet 2. Other parts are the same as in the sixth embodiment.

  The front sheet 2 is provided with a first hole portion 15 ′ and a second hole portion 16 ′ penetrating the outer cover layer 31 ′ on the outer surface side of the thermal adhesive layer 35 ′ with the folding position 20 interposed therebetween. The second hole portion 16 ′ is formed inside the inner edge of the side edge heat bonding portion 11. A plurality of first hole portions 15 ′ and second hole portions 16 ′ are provided at the same interval in the vertical direction.

  The first hole portion 15 ′ and the second hole portion 16 ′ are opposed to each other by folding the folded piece 12 ′. The thermal adhesive layer 35 ′ of the front sheet 2 facing the first hole 15 ′ and the thermal adhesive layer 35 ′ of the front sheet 2 facing the second hole 16 ′ are thermally bonded. As a result, the folded portion 12 is fixed by the spot-shaped fixing portion 13.

  At this time, the inside of the self-supporting bag 1 is thermally bonded to the fixing portion 13 with the shielding sheet (not shown) facing the fixing portion 13 between the front side sheet 2 and the back side sheet 3. The shielding sheet is removed. The shielding sheet prevents thermal bonding between the thermal bonding layer 35 ′ of the front sheet 2 inside the side edge thermal bonding portion 11 and the thermal bonding layer 35 of the back sheet 3. For this reason, the filling area | region of the content of the self-supporting bag 1 is not parted by the adhering part 13 like the above-mentioned 6th Embodiment shown in FIG.

  According to this embodiment, the same effect as that of the sixth embodiment can be obtained. Further, since the heat bonding layers 35 ′ of the front sheet 2 facing the first and second hole portions 15 ′ and 16 ′ provided in the outer cover layer 31 ′ of the front sheet 2 are thermally bonded, the fixing portion 13 can be easily formed. And the folded portion 12 can be fixed.

  At this time, the filling region of the contents of the self-standing bag 1 is not divided by the fixing part 13 provided on the inner side of the side edge heat bonding part 11, and the contents can be easily discharged. Therefore, the convenience of the self-supporting bag 1 can be further improved.

  In the present embodiment, the folded portion 12 may be fixed by the fixing portion 13 formed by the hot melt 17 (see FIG. 10) as in the third embodiment. Moreover, you may provide the label part 22 (refer FIG. 13) similar to 5th Embodiment.

  In the first to seventh embodiments, the front sheet 2 and the back sheet 3 may be formed by folding a single laminated film 30 in two. Moreover, although the spout 6 is formed by spout, you may form the spout 6 by fracture | rupturing the front side sheet | seat 2 and the back side sheet | seat 3 of the upper part of the self-supporting bag 1. FIG.

  According to the present invention, it can be widely used for a self-supporting bag of the bottom gusset type.

DESCRIPTION OF SYMBOLS 1 Self-supporting bag 2 Front side sheet 3 Back side sheet 4 Bottom sheet 6 Spout 8 Bottom thermal bonding part 9 Upper edge thermal bonding part 10, 11 Side edge thermal bonding part 12 Folding part 12 'Folding piece 13 Adhering part 14 Protruding part 15, 15 'First hole portion 16, 16' Second hole portion 17 Hot melt 18 Dividing portion 19 Inner protruding portion 20 Bending position 21 Annular heat bonding portion 22 Label portion 23 Slit 30 Laminated film 31, 31 'Outer coating layer 35, 35' Thermal adhesive layer

Claims (8)

  Each has a front sheet, a back sheet and a bottom sheet composed of laminated films each having a thermal adhesive layer on the inner surface side, and the bottom sheet is folded in half and sandwiched between lower portions of the front sheet and the back sheet, A self-supporting bag in the form of a bottom gusset obtained by thermally bonding the peripheral edges of the sheet, and having a folded portion obtained by folding a side edge heat-bonded portion obtained by thermally bonding a side edge of the front side sheet and the back side sheet. A self-standing bag, wherein the portion is fixed to the front sheet or the back sheet by one or a plurality of fixing portions.   The first and second hole portions facing each other by folding the folded portion are formed in the front sheet, and the heat of the back sheet facing the first hole and the heat of the back sheet facing the second hole. The self-supporting bag according to claim 1, wherein the fixing portion is formed by heat bonding with an adhesive layer.   The first and second hole portions facing each other by folding the folded portion are formed in the outer cover layer on the outer surface side of the thermal adhesive layer of the front sheet, and the thermal adhesive layer and the second hole facing the first hole portion. The self-standing bag according to claim 1, wherein the fixing portion is formed by thermally bonding the thermal adhesive layer facing the portion.   The self-standing bag according to claim 2 or 3, wherein the fixing portion is provided on the side edge thermal bonding portion.   The self-supporting bag according to any one of claims 1 to 3, wherein the fixing portion is provided inside the side edge thermal bonding portion.   The self-standing according to any one of claims 1 to 5, wherein the side edge thermal bonding portion has a protruding portion protruding sideways, and the folded portion is formed by folding the protruding portion. bag.   6. The side edge thermal bonding portion has a plurality of divided portions that divide an outer end portion in the vertical direction, and the folded portion is formed by folding between the divided portions. A self-supporting bag according to any one of the above.   The pour spout is provided at one upper corner, and the folded portion is provided at the side edge thermal bonding portion on the side where the pour spout does not exist. Self-supporting bag.

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