JP5302554B2 - Self-supporting packaging bag and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-standing wrapping bag and its manufacturing method which can achieve the freedom of the positioning of tools with the improved bonding strength of a top sheet and side sheets. <P>SOLUTION: Top bonded parts 22, 25 are formed by the two-folded top sheet 12 and the top area of a front side sheet 13 and the top area of a back side sheet 14 bonded to each other by hot welding. The top bonded parts 22, 25 have center bonded parts 23, 26 formed in a way that they are positioned at a center region in the width direction of a body 10 and side bonded parts 24, 27 formed in a way that they are positioned at a side region in the width direction of the body 10. The center side of the side bonded parts 24, 27 and sides of the center bonded parts 23, 26 are positioned in a way that they overlap with each other and the top sheet 12, the front side sheet 13, and the back side sheet 14 are doubl-bonded at this section. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a self-standing packaging bag formed by bonding a sheet-like material into a cylindrical shape and a method for manufacturing the same.

  There is known a packaging bag in which a synthetic resin film such as polyethylene is formed in a cylindrical bag shape. This packaging bag is used, for example, as a packaging container that contains liquids such as soft drinks and detergents, gel-like substances such as jelly drinks, and paste-like substances such as miso. As this type of packaging bag, the one disclosed in Patent Document 1 is known. In the packaging bag of Patent Document 1, as shown in FIG. 1 of the document, a top sheet and a bottom sheet that are folded in two into a side sheet composed of a front sheet and a rear sheet are sandwiched, and each sheet is mutually attached. Bonded to form a cylinder. The height of the front sheet is lower than that of the rear sheet, and accordingly, the top sheet is formed such that the front side length from the fold is shorter than the rear side length. The mouthpiece is fixed to the center in the width direction of the packaging bag between the upper edge of the front sheet and the edge of the top sheet.

In order to manufacture such a packaging bag, as shown in FIG. 4 of Patent Document 1, first, the side edges of the front sheet and the top sheet, the side edges of the rear sheet and the top sheet, the rear sheet and the top sheet are used. The upper edge of the face sheet is thermally bonded simultaneously with a hot plate. Secondly, the heat insulating plate is inserted into the folded portion of the top sheet, and the upper end edge of the front sheet and the top sheet is thermally bonded by a hot plate so as to have a non-adhesive zone at the center. Thirdly, the non-adhesive area is thermally bonded with a hot plate and sealed while the mouthpiece is inserted into the non-adhesive area of the upper edge of the front sheet and the top sheet. After that, as shown in FIG. 2 of Patent Document 1, the inclined seal portion is formed by thermal bonding with a hot plate, and the triangular region outside the inclined seal portion is cut off.
JP 2000-153852 A

  The packaging bag described in Patent Document 1 is configured such that a mouthpiece is interposed in the front upper edge made of the front sheet and the top sheet, but the rear upper edge made of the rear sheet and the top sheet. The mouthpiece is not configured to be interposed. This is because the upper end edge on the front side is lower than the upper end edge on the rear side, and the integration efficiency is improved by not providing a mouthpiece on the upper end edge on the rear side. However, the degree of freedom regarding the arrangement of the mouthpieces is reduced.

  Also, this type of packaging bag may be filled with several liters of contents, and when the contents are poured out from the mouthpiece, the contents may be placed on the front upper edge or the rear upper edge. A considerable pressing force due to will act. If such a pressing force becomes excessively large, the thermal bonding portion at the upper end edge may peel off and the bag may be broken. In order to cope with this inconvenience, for example, it is conceivable to increase the width of the thermal bonding portion at the upper edge of the front side and the rear side. I cannot expect an improvement in efficiency.

  The invention relating to the self-supporting packaging bag and the manufacturing method thereof of the present application has been made in view of such problems of the prior art, and the technical problem is to ensure the degree of freedom regarding the arrangement of the mouthpiece, and the top sheet. This is to improve the adhesive strength with the side sheet.

In view of the above technical problem, the invention according to claim 1 is characterized in that the bottom sheet and the lower region of at least two side sheets of the first side sheet and the second side sheet sandwiching the bottom sheet are bonded together. An adhesive portion is formed, the top sheet and the upper region of the side sheet sandwiching the top sheet are bonded to form an upper adhesive portion, and the side edge regions of the side sheet are bonded to each other to form the side adhesive portion In the self-standing packaging bag that is formed into a cylindrical shape by being formed and is provided with a mouthpiece that allows the content to flow, the upper adhesive portion includes a central region in the width direction of the side sheet. And a side adhesive part provided in a lateral region of the side sheet in the width direction, the central adhesive part and the side adhesive part are formed to overlap, the side adhesive part is Said first side sea And a first side adhesive part formed by adhering the top sheet, and a second side adhesive part formed by adhering the second side sheet and the top sheet, The second side adhesive portion is disposed opposite to the first side adhesive portion, the adhesive region of the first side adhesive portion and the adhesive region of the second side adhesive portion are formed in the same size, and the mouthpiece is the first side surface. The sheet is interposed in at least one of the central adhesive part where the sheet and the top sheet are bonded, and the central adhesive part where the second side sheet and the top sheet are bonded.

  According to this configuration, in both the central adhesive portion where the first side sheet and the top sheet are bonded, and the central adhesive portion where the second side sheet and the top sheet are bonded, the mouthpiece is used. It is possible to intervene, and a degree of freedom can be given to the arrangement of the mouthpiece. Further, since the central adhesive portion and the side adhesive portion of the upper adhesive portion are formed so as to overlap with each other, adhesion of the overlapping portion is further strengthened. Therefore, since the adhesive strength of the upper adhesive portion is improved regardless of the presence or absence of the mouthpiece, the bag breakage is suppressed even if an excessive pressing force by the contents acts on the upper adhesive portion.

  The invention according to claim 2 is the self-supporting packaging bag according to claim 1, wherein the side adhesive portion of the side edge region of the side sheet where the top sheet is sandwiched is at least three times. It is characterized by having a triple adhesion structure formed by adhesion. According to this structure, since the upper end side of the side adhesion part is firmly bonded in a triple adhesion structure, the bag breakage at the part is suppressed and the cylindrical shape of the packaging bag is suitably held.

In view of the above technical problem, the invention according to claim 3 is the contents of the bottom sheet, the top sheet, the first side sheet, and the second side sheet formed into a cylindrical shape and the contents. In the manufacturing method of a self-supporting packaging bag provided with a mouthpiece that allows the circulation of the lower bonding step of forming a lower bonding portion by bonding the bottom sheet and a lower region of the side sheet sandwiching the bottom sheet, Between the top sheet and the upper region of the first side sheet, and between the top sheet and the second region of the second side sheet, so as to have a non-adhesive zone at the center in the width direction of the side sheet. A side adhesion step for adhering the widthwise side regions of the side sheets to form the side adhesion portions of the upper adhesion portion while preventing the top sheets from adhering to each other, and the side edge regions of the side sheets Of which, the top sheet is sandwiched While adhering between the top sheet and the first side sheet and between the top sheet and the second side sheet at a rare part, do not adhere the top sheets to each other at the part. In addition, in the other part, the side adhesion first step of adhering the side edge regions of the first side sheet and the second side sheet to each other to form a side adhesion portion, the top sheet and the first side sheet, An upper sealing portion comprising an opening sealing step for forming a central adhesive portion of the upper adhesive portion by adhering a region including the center in the width direction of the side surface sheet, and the top sheet and the second side sheet. Of the side edge region of the side sheet, the top bonding step of bonding the non-bonded region to the non-bonded region of the upper bonded portion and bonding the non-bonded region to form the central bonded portion of the upper bonded portion. The side sheet at the part sandwiching the face sheet A side bonding second step for bonding side members to each other to form a side bonding portion, and a side bonding portion formed in the side bonding step and a central bonding formed in the opening sealing step and the mouthpiece bonding step A first side adhesive part formed by adhering the first side sheet and the top sheet as the side adhesive part formed in the side adhesive step, and the second side sheet And a second side adhesive part formed by adhering the top sheet, the first side adhesive part and the second side adhesive part are arranged to face each other, wherein the second side bonding portion of the bonding region, characterized in Rukoto are formed in the same size.

  According to this configuration, the side bonding step and the opening sealing step are separate steps, and the side bonding portion and the central bonding portion obtained by these steps are manufactured so as to overlap each other. Similarly, the side bonding step and the mouthpiece bonding step are separate steps, and the side bonding portion and the central bonding portion obtained by these steps are manufactured so as to overlap each other. The part where the side adhesive part and the central adhesive part overlap contributes to improving the strength of the self-supporting packaging bag, and such a structure can be easily formed by separating the side adhesive process from the opening sealing process and the mouthpiece adhesive process. can do. In particular, any of the manufacturing orders of the side bonding process, the opening sealing process, and the mouthpiece bonding process may precede.

  According to a fourth aspect of the present invention, in the method for manufacturing a self-supporting packaging bag according to the third aspect, in the mouthpiece adhering step, an upper adhesive portion including the top surface sheet and the first side surface sheet and the top surface At least one of the upper adhesive portions is bent so that the upper adhesive portions made of the sheet and the second side sheet are separated from each other.

  For example, the upper adhesive portion may be formed by heat welding with a hot plate. In this case, since the mouthpiece bonding step is performed in a state where the upper bonding portions are separated from each other, each sheet is held in contact with the hot plate without using a heat insulating plate or the like. According to this configuration, since the heat of the hot plate acts directly on each sheet, the formation of the upper adhesive portion is ensured and the efficiency of thermal welding is suppressed from being reduced.

  Invention of Claim 5 is a manufacturing method of the self-supporting packaging bag of Claim 3 or Claim 4, The said side adhesion of the site | part by which the said top sheet was pinched among the side edge area | regions of the said side sheet. The part is subjected to bonding at least three times of the side bonding step, the side bonding first step, and the side bonding second step. According to this configuration, the upper end side of the side bonding portion is subjected to bonding in at least three steps, so that the bonding state at the portion becomes strong. Therefore, the cylindrical shape of the packaging bag is suitably held while suppressing bag breakage at the site.

  According to the self-supporting packaging bag and the manufacturing method thereof of the present invention, the degree of freedom can be given to the arrangement of the mouthpieces, and the adhesive strength between the top sheet and the side sheet can be improved.

  Embodiments relating to the self-supporting packaging bag of the present invention will be described with reference to FIGS. As shown in FIG. 1, the self-supporting packaging bag of the present embodiment is composed of a cylindrical main body 10 that stores the contents, and a mouthpiece 30 that is attached to the main body 10 and allows the contents to flow. Yes.

  As shown in FIG. 2, the body portion 10 of the self-supporting packaging bag has a bottom sheet 11 that is folded in two so that the crease faces upward (upper side in FIG. 2), and the crease is lower (lower side in FIG. 2). A top sheet 12 folded in two so as to face, a bottom sheet 11 and a front sheet 13 as a first side sheet sandwiching the top sheet 12 and a rear sheet 14 as a second side sheet. .

  As shown in FIG. 2, the bottom sheet 11 in a folded state is formed in a quadrangular shape, and a long hole-like lower bonding hole 11a is formed in the side edge so as to penetrate the front and rear. In a state where the bottom sheet 11 is folded in two, the surface facing the front sheet 13 and the rear sheet 14 (outer surface) is formed so as to have heat-weldability and the inner surface has non-heat-weldability. Yes. The bottom sheet 11 is arranged in a folded state so that the lower ends thereof are aligned with the lower ends of the front sheet 13 and the rear sheet 14. As shown in FIG. 2, the front sheet 13 and the rear sheet 14 are formed in a vertically long rectangular shape having the same size, and are formed so that opposing surfaces facing each other have heat-welding properties.

  As shown in FIG. 2, the top sheet 12 in a folded state is formed in a quadrangular shape, and a long hole-like upper adhesive hole 12a is formed in the side edge so as to penetrate the front and rear. The top sheet 12 is formed in a folded state so that the face (outer face) facing the front sheet 13 and the rear sheet 14 has heat-weldability and the inner face has non-heat-weldability. ing. Then, the top sheet 12 is arranged in a folded state so that the upper ends thereof are aligned with the upper ends of the front sheet 13 and the rear sheet 14.

  As shown in FIGS. 1 and 3, the bottom sheet 11 folded in half, the lower region of the front sheet 13, and the lower region of the rear sheet 14 are bonded together by thermal welding to form a lower bonding portion 21. As shown in FIG. 3, the lower adhesive portion 21 is formed so as to be a region surrounded by a curved line that is concave in an arc shape in the height direction of the main body 10 and the side and bottom edges of the main body 10 when viewed from the front. Has been.

  As shown in FIGS. 1 and 3, the front sheet 13 and the rear sheet 14 of the main body 10 have side edge regions bonded to each other by thermal welding to form a side bonding portion 28. As shown in FIG. 3, the side adhesive portion 28 is formed to have a uniform width in the width direction of the main body portion 10 (left and right direction in FIG. 3) from the lower end to the upper end of both side edges of the main body portion 10. Of the side edges of the main body 10, in the lower region of the front sheet 13 and the rear sheet 14, the side edges of the bottom sheet 11 and the front sheet 13 are bonded, and the side between the bottom sheet 11 and the rear sheet 14. The edges are bonded. Further, the front sheet 13 and the rear sheet 14 are bonded via the lower bonding holes 11 a formed in the bottom sheet 11. Among the side edges of the main body 10, in the upper region of the front sheet 13 and the rear sheet 14, the side edges of the top sheet 12 and the front sheet 13 are bonded together, and the top sheet 12 and the rear sheet 14 Are adhered to the side edges. Further, the front sheet 13 and the rear sheet 14 are bonded via the upper bonding hole 12 a of the top sheet 12.

  As shown in FIGS. 1 and 3, the top-up sheet 12 folded in half and the upper region of the front sheet 13 are bonded together by heat welding to form a front upper bonding section 22 as an upper bonding section. As shown in FIG. 3, the front upper adhesive portion 22 is a region surrounded by a curved line that is recessed in an arc shape in the height direction of the main body 10 and the side and upper edges of the main body 10 when viewed from the front. Is formed. Similarly, the top sheet 12 folded in half and the upper region of the rear sheet 14 are bonded by thermal welding to form a rear upper bonding portion 25 as an upper bonding portion. In the present embodiment, the front upper adhesive portion 22 and the rear upper adhesive portion 25 are formed in the same shape and size.

  As shown in FIG. 3, the front upper adhesive portion 22 is formed with a front center adhesive portion 23 so as to be located in a central region in the width direction of the main body portion 10, and on the side in the width direction of the main body portion 10. A front side adhesive portion 24 is formed so as to be located in the region. The front side adhesive portion 24 is formed so that the length in the height direction of the main body portion 10 increases from the center of the main body portion 10 toward the side edge, and is formed in a substantially right triangle shape having an arcuate hypotenuse. Yes. The front side adhesive portion 24 is located on the fold line of the top sheet 12 in which the inner edge of the front side adhesive portion 24 and the inner edge of the side adhesive portion 28 are folded in two, and the top edge in the folded state is formed on the side edge of the main body portion 10. It is formed so as to have the same height as the face sheet 12. Further, the center side portion of the front side adhesive portion 24 and the side edge side portion of the front center adhesive portion 23 are arranged so as to overlap each other, and in this portion, the front sheet 13 and the top sheet 12 are doubled. It is glued to.

  As shown in FIG. 3, a rear center adhesive portion 26 is formed in the rear upper adhesive portion 25 so as to be located in a central region in the width direction of the main body portion 10, and on the lateral side of the main body portion 10. A rear side adhesive portion 27 is formed so as to be located in the region. And the length of the height direction of the main-body part 10 of the back center adhesion | attachment part 26 is formed so that it may become the same length as the width | variety of the base 32 of the mouthpiece 30 mentioned later, the back sheet | seat 14 and the top sheet | seat 12 The base part 32 of the mouthpiece 30 mentioned later is adhere | attached in between.

  As shown in FIG. 3, the rear side adhesive portion 27 is formed so that the length in the height direction of the main body portion 10 increases from the center of the main body portion 10 toward the side edge, and has an arcuate hypotenuse. It is formed in a right triangle shape. The rear side adhesive portion 27 is located on the fold line of the top sheet 12 in which the inner edge of the rear side adhesive portion 28 and the inner edge of the side adhesive portion 28 are folded in two, and is folded in the half-folded state on the side edge of the main body portion 10. It is formed so as to have the same height as the face sheet 12. Further, the central side portion of the rear side adhesive portion 27 and the side edge side portion of the rear central adhesive portion 26 are arranged so as to overlap each other, and in this portion, the rear sheet 14 and the top sheet 12 are doubled. It is glued to.

In the present embodiment, the front center adhesive portion 23 has the front sheet 13 and the top sheet 12 bonded together without the mouthpiece 30 interposed.
In the present embodiment, the upper side of the side bonding portion 28 is the first side bonding step S3 and the second side bonding step S6 for forming the side bonding portion 28, and the front side bonding portion 24 and the rear side bonding portion 27. The three-sided adhesion structure formed through the three adhesion steps of the side adhesion step S2 is formed (details will be described later).

  As shown in FIGS. 1 and 3, a mouthpiece 30 is interposed in the rear center adhesive portion 26 where the rear sheet 14 and the top sheet 12 are bonded. As shown in FIG. 2, the mouthpiece 30 includes a cylindrical body 31 having a predetermined opening and a cap 33 that can be attached to and detached from the opening of the cylindrical body 31. As shown in FIG. 2, a base 32 sandwiched between the rear sheet 14 and the top sheet 12 is formed below the cylindrical body 31. The base portion 32 of the cylindrical body 31 is formed in a substantially rhombus shape configured with a smooth curve when viewed from below (downward in FIG. 2). The width of the base portion 32 in the height direction (vertical direction in FIG. 2) is formed so as to obtain sufficient adhesive strength (for example, 5 mm or more) when bonded to the rear sheet 14 and the top sheet 12. . The cap 33 is attached to and detached from the opening above the cylindrical body 31 by rotating.

Next, a method for manufacturing the above self-supporting packaging bag will be described with reference to FIGS.
In the present embodiment, the self-supporting packaging bag is manufactured by bonding and cutting the belt-like sheets according to the procedure shown in the flowchart of FIG. As shown in FIG. 5, the belt-like bottom sheet 11 is folded in two along the longitudinal direction, and a belt-like lower heat insulating sheet 41 made of a material having a low coefficient of friction and low thermal conductivity is inserted therebetween (inner side). Further, the belt-like top sheet 12 is folded in half along the longitudinal direction, and the belt-like upper heat insulating sheet 42 is inserted between them (inside). The bottom sheet 11 is previously formed with lower adhesive holes 11a at predetermined intervals in the longitudinal direction, and the top sheet 12 is previously formed with upper adhesive holes 12a at predetermined intervals in the longitudinal direction. (In FIG. 5, the lower bonding hole 11a and the upper bonding hole 12a are not shown). Then, the bottom sheet 11 and the top sheet 12 in a folded state are arranged so that the creases face each other, and the bottom sheet 11 and the top sheet 12 are sandwiched between the strip-shaped front sheet 13 and the strip-shaped rear sheet 14, Stack each sheet. At this time, the lower end of the bottom sheet 11 and the lower end of the front sheet 13 and the lower end of the rear sheet 14 are overlapped so that the upper end of the top sheet 12, the upper end of the front sheet 13 and the upper end of the rear sheet 14 are aligned. Superimpose to align.

  Each overlapped sheet is then subjected to a lower adhesion step S1. In the lower bonding step S1, the front sheet 13 and the front sheet 13 are formed by lower heat welding means (not shown) having a contact surface that is recessed in an arc shape in the short direction (the height direction of the main body 10) of each belt-like sheet. The rear sheet 14 is sandwiched. By heating the lower heat welding means in this state, the lower region of the front sheet 13 and the bottom sheet 11 are thermally welded to form the lower adhesive portion 21 and the rear sheet 14 and the bottom sheet 11 are thermally welded to the bottom. An adhesive portion 21 is formed. After the formation of the lower adhesive portion 21 is completed, the lower heat insulating sheet 41 is removed from between the bottom sheet 11.

  In the side bonding step S2, side heat welding means (not shown) having an abutting surface that is recessed in an arc shape in the short direction (the height direction of the main body 10) of each belt-like sheet is used. The contact surface of the side heat welding means has a recess in the center in the longitudinal direction of each belt-shaped sheet, and the contact surface is divided into two by the recess. When the side heat welding means sandwiches the front sheet 13 and the rear sheet 14, the abutting surfaces abut each sheet, but the central recess does not abut each sheet, and the side heat welding means is heated in such a state. By doing so, the upper region of the front sheet 13 and the top sheet 12 are heat-welded, and the front upper adhesive portion 22 having a non-adhesive zone in the center in the longitudinal direction (width direction of the main body portion 10) of the belt-like sheet, that is, the front Side adhesive portions 24 are formed. Further, the rear upper sheet 14 and the top sheet 12 are heat-welded, and the rear upper bonding section 25 having a non-bonded area at the center in the longitudinal direction (width direction of the main body section 10) of the belt-shaped sheet, that is, the rear side bonding section 27. Form. The front side adhesive portion 24 and the rear side adhesive portion 27 are simultaneously formed in the side adhesive step S2.

  Next, each sheet is subjected to a first side bonding step S3. In the first side bonding step S3, the front sheet 13 and the rear sheet 14 are formed by first side heat welding means (not shown) in which a pair of contact surfaces are formed at predetermined intervals in the longitudinal direction of each belt-shaped sheet. Between. By heating the side heat welding means in this state, the front sheet 13 and the rear sheet 14 are heat welded to form the side adhesive portion 28. In this first side bonding step S3, the side edge region of the front sheet 13 and the side edge region of the rear sheet 14 are bonded to each other at the portion where the bottom sheet 11 is sandwiched through the lower bonding hole 11a formed in the bottom sheet 11. To do. On the other hand, since the upper heat insulating sheet 42 is still inserted between the top sheet 12 folded in two, the side edge region of the front sheet 13 and the rear sheet 14 at the portion where the top sheet 12 is sandwiched. It is not bonded to the side edge region.

  After the formation of the side adhesive portion 28 is completed, the upper heat insulating sheet 42 is removed from between the top sheet 12. Thereafter, the belt-like sheets bonded by the bonding portions are cut by a cutting means (not shown) to manufacture the main body portion 10.

  The main body 10 is then subjected to an opening sealing step S4 and a mouthpiece bonding step S5. In the present embodiment, the front sheet 13 and the rear sheet 14 are set so as to have a vertical relationship, and the opening sealing step S4 and the mouthpiece bonding step S5 are performed. FIG. 6 shows a state where the front sheet 13 is set to be lower and the rear sheet 14 is set to be upper. In the opening sealing step S4, first, as shown in FIG. 6A, an upright operation device (for example, a sheet is sucked by the suction nozzle 44, and the suction nozzle 44 is rotated by a driving means to be erected. The rear sheet 14 and the top sheet 12 portion on the rear sheet 14 side, that is, the rear upper adhesive portion 25, are bent using the folding line of the folded top sheet 12 as a reference. Stand up. At this time, the front sheet 13 and the top sheet 12 on the side of the front sheet 13 remain set while the non-bonded area of the front upper bonding portion 22 is bent so as to be directed right above. Since the front upper adhesive portion 22 and the rear upper adhesive portion 25 are held horizontally, they are separated from each other.

  As shown in FIG. 6 (b), the front sheet 13 and the top sheet 12 portion on the front sheet 13 side are bonded by the front side bonding portion 24 and the side bonding portion 28, while the front sheet 13 is in front of the width direction center. A non-adhesive area that bisects the side adhesive portion 24 is formed. The front center adhesive part 23 is formed by sandwiching the non-adhesive area and the end of the front side adhesive part 24 on the non-adhesive area side with the opening heat welding means 45 and heating the opening heat welding means 45. At this time, the front center adhesive portion 23 and the front side adhesive portion 24 are formed so that their end portions overlap each other.

  As shown in FIG. 6C, the rear sheet 14 in the standing state and the top sheet 12 portion on the rear sheet 14 side are bonded by the rear side bonding portion 27 and the side bonding portion 28, and the width thereof A non-adhesive zone that bisects the rear side adhesive portion 27 is formed in the center in the direction. The mouthpiece 30 is supplied to the non-bonded area by a mouthpiece supply device (not shown), and the base portion 32 of the mouthpiece 30 is sandwiched between the rear sheet 14 and the top sheet 12. In this state, the non-adhesive region and the end of the rear side adhesive portion 27 on the non-adhesive region side are targeted and sandwiched by the tool thermal welding means 46 having a contact surface that matches the shape of the base 32 of the tool 30. The rear center adhesive portion 26 is formed by heating the mouthpiece heat welding means 46. At this time, the rear center adhesive portion 26 and the rear side adhesive portion 27 are formed such that their end portions overlap each other.

  After the opening sealing step S4 and the mouthpiece bonding step S5, the main body 10 is subjected to the side bonding second step S6. In the second side bonding step S6, as shown in FIG. 6 (d), the rear upper adhesive portion 25 that has stood up is returned to a horizontal state so that the front upper adhesive portion 22 and the rear upper adhesive portion 25 are in contact with each other. To. The second side heat welding means 47 is formed with a pair of contact surfaces at a predetermined interval in the width direction of the main body 10, and the front side sheet 13 and the rear side sheet 14 are formed by the second side heat welding means 47. Of the side edge region, the portion where the top sheet 12 is sandwiched is sandwiched. At this time, the lower end of the contact surface of the second side heat welding means 47 is located at a portion where the top sheet 12 is not interposed. In this state, the front side sheet 13 and the rear side sheet 14 are thermally welded by heating the second side heat welding means 47 to form the side adhesive portion 28. In this second side bonding step S6, the side edge region of the front sheet 13 and the side edge region of the rear sheet 14 at the part where the top sheet 12 is sandwiched through the upper bonding hole 12a formed in the top sheet 12 Glue. The side edge region of the front sheet 13 and the side edge region of the rear sheet 14 at the portion where the top sheet 12 is sandwiched are respectively in the side bonding step S2, the side bonding first step S3, and the side bonding second step S6. Due to the effect of heat welding, a triple adhesion structure is formed as a result.

According to said embodiment, the following effects can be acquired.
(1) In the present embodiment, the mouthpiece 30 is interposed in the rear center adhesive portion 26. However, since the front center adhesive part 23 having the same configuration as the rear center adhesive part 26 is formed, the mouthpiece 30 is interposed in the front center adhesive part 23, or the front center adhesive part 23 and the rear center adhesive part 26. It is easy to change so as to intervene in both, and a degree of freedom can be given to the arrangement of the mouthpiece 30.

  (2) In the present embodiment, the rear center adhesive portion 26 and the rear side adhesive portion 27 are formed so as to overlap each other. On the other hand, the front center adhesive part 23 and the front side adhesive part 24 in which no mouthpiece 30 is interposed are formed so as to overlap. Therefore, the adhesive strength of the front upper adhesive portion 22 and the rear upper adhesive portion 25 is improved regardless of the presence or absence of the mouthpiece 30, and excessive pressing force by the contents acts on the front and rear upper adhesive portions 22 and 25. Even if the bag is broken, it is suppressed.

  (3) In this embodiment, the site | part where the top sheet 12 was inserted | pinched among the side edge area | regions of the front sheet | seat 13 has comprised the triple adhesion structure through the 3 times adhesion process. Moreover, the site | part in which the top | upper surface sheet | seat 12 was inserted | pinched among the side edge area | regions of the back surface sheet 14 has comprised the triple adhesion structure through three times of adhesion processes. Since the sheets are firmly bonded to each other at the portion having the triple adhesion structure, the bag breaking at the portion is suppressed and the cylindrical shape of the self-supporting packaging bag can be suitably maintained.

  (4) In this embodiment, the back side adhesion part 27 is formed by the side adhesion process S2, and the back center adhesion part 26 is formed by the mouthpiece adhesion process S5, and each is formed by another process. Similarly, the front side adhesive portion 24 and the front center adhesive portion 23 are formed in separate steps of the side adhesive step S2 and the opening sealing step S4, respectively. By forming these steps as separate steps, a portion where the rear side adhesive portion 27 and the rear central adhesive portion 26 overlap and a portion where the front side adhesive portion 24 and the front central adhesive portion 23 overlap are easily formed. Can do.

  (5) In this embodiment, in the state of the main body 10 before performing the opening sealing step S4 and the mouthpiece bonding step S5, the top sheet 12 is sandwiched among the side edge regions of the front sheet 13 and the rear sheet 14. The inner side surfaces of the top sheet 12 are not bonded to each other at the portion, and the upper region of the main body 10 can be folded along the fold of the top sheet 12. In particular, in the present embodiment, the opening sealing step S4 and the mouthpiece bonding step S5 are performed in a state where the rear upper adhesive portion 25 is bent and the front upper adhesive portion 22 and the rear upper adhesive portion 25 are separated from each other. Therefore, each of the opening heat welding means 45 can be sandwiched by directly contacting the front sheet 13 and the top sheet 12, and the non-adhesion area can be bonded by the heat from each of the opening heat welding means 45. Similarly, each of the mouthpiece heat welding means 46 can be sandwiched by being in direct contact with the rear sheet 14 and the top sheet 12, and the non-bonded area can be bonded by the heat from each of the mouthpiece heat welding means 46. it can. Therefore, it becomes possible to reliably form the front center adhesive part 23 and the rear center adhesive part 26 by the heat of each heat welding means directly acting on each sheet. Moreover, since the front center adhesive part 23 and the rear center adhesive part 26 are formed by the heat | fever acted from the front-back direction, it suppresses that the efficiency of heat welding is reduced, and the structure of each heat welding means is accompanied by it. It becomes possible to make it compact.

  (6) In the packaging bag disclosed in Patent Document 1, the height of the front sheet is lower than the height of the rear sheet, and the mouthpiece is between the upper edge of the front sheet and the edge of the top sheet. It is fixed. In such a configuration, when the packaging bag is filled with the contents so as to be almost full, the position of the mouthpiece becomes lower than the uppermost surface of the contents. Then, as soon as the mouthpiece is opened, the contents pop out, and the contents pouring work becomes complicated. Moreover, since the filling space for the contents is larger on the rear side (rear sheet side) of the packaging bag, the center of gravity of the packaging bag tends to be biased toward the rear side, and it is difficult to obtain stable independence. In order to eliminate these inconveniences, it may be possible to adjust the filling amount so that the uppermost surface of the contents is lower than the position of the mouthpiece, but in particular, it is composed of the upper part of the rear sheet and the top sheet. Space is wasted and volumetric efficiency is reduced.

  In the present embodiment, the front sheet 13 and the rear sheet 14 have the same shape, and the front and rear upper adhesive portions 22 and 25 are formed in the same shape and size. Therefore, when the self-supporting packaging bag is filled with the contents, the upper surface of the contents does not exist at a position higher than the mouthpiece 30, and the contents pop out as soon as the cap 33 of the mouthpiece 30 is opened. Is unlikely to occur. Moreover, the filling space of the contents in the front-rear direction of the self-supporting packaging bag is uniform, the possibility that the center of gravity of the self-supporting packaging bag is biased to the front side or the rear side is low, and the self-supporting stability is high. In addition, the self-supporting packaging bag looks good.

  (7) For example, it is possible to make the adhesion of each sheet stronger by performing a plurality of thermal welding processes at the same location. However, it cannot be denied that the production efficiency of the self-supporting packaging bag is lowered when the heat welding process is increased. In the present embodiment, through the steps of the side adhesion step S2, the side adhesion first step S3, and the side adhesion second step S6, the triple part is attached to the portion of the side edge region of the main body 10 where the top sheet 12 is sandwiched. An adhesive configuration is formed. These three steps are all steps necessary for forming each sheet into a cylindrical shape, and are not steps employed only for forming a triple bonded configuration. Therefore, in this embodiment, a triple adhesion structure can be formed in the site | part where the top | upper surface sheet | seat 12 was pinched among the side edge area | regions of the main-body part 10, without significantly reducing the production efficiency of a self-supporting packaging bag.

  (8) The self-standing packaging bag before being subjected to the opening sealing step S4 and the mouthpiece bonding step S5 is not bonded to the center in the width direction in both the front upper bonding portion 22 and the rear upper bonding portion 25. Area exists. These non-bonded areas are not sandwiched between the contact surfaces of the heat welding means in the process of forming the front side bonding part 24, the rear side bonding part 27, and the side bonding part 28. Since these non-adhesion areas are not exposed to the heat of the heat welding means, it is possible to prevent the insertion failure of the mouthpiece 30 due to the absence of the predetermined non-adhesion areas.

The above-described embodiment may be modified as follows, and the following modified examples may be implemented in combination with each other .

  -Among the front center adhesive part 23 and the back center adhesive part 26 of the said embodiment, you may interpose things other than the mouth tool 30 about the center adhesive part in which the mouth tool 30 is not interposed. For example, both ends of a belt having a predetermined length may be interposed in the central adhesive portion so that the belt can be used as a handle.

  -In above-mentioned embodiment, as shown in FIG. 3, although the mouthpiece 30 was provided on the centerline L extended in the height direction of the main-body part 10, arrangement | positioning of this mouthpiece 30 can be changed. The mouthpiece 30 can be disposed anywhere between the pair of side adhesive portions 28. For example, the mouthpiece 30 can be disposed so as to be in contact with the side adhesive portion 28, and it can be said that the arrangement change of the mouthpiece 30 is a form of a configuration in which the body portion 10 is provided at the center in the width direction. It should be noted that the configuration of the center adhesive portions 23 and 26 and the side adhesive portions 24 and 27 needs to be changed along with such a change in the arrangement of the mouthpiece 30.

In the above embodiment, the mouthpiece 30 is interposed in the rear center adhesive portion 26, but may be changed so as to be interposed in the front center adhesive portion 23. Alternatively, as shown in FIG. 7 , the mouthpiece 30 may be interposed between the rear center adhesive portion 26 and the front center adhesive portion 23. When the mouthpieces are interposed in both the central adhesive portions 23 and 26, if the opening diameters of these mouthpieces are changed, the amount of contents to be dispensed will be different. In manufacturing the self-supporting packaging bag having such a configuration, the opening sealing step S4 may be changed to the second mouthpiece adhering step.

  -You may change the shape of the lower adhesion hole 11a and the upper adhesion hole 12a which were formed in the shape of a long hole. For example, it may be formed in a circular shape or a quadrangular shape. Further, notches may be formed in the side edges of the bottom sheet 11 and the top sheet 12 formed in a square shape, and the front sheet 13 and the rear sheet 14 may be bonded via the notches. Furthermore, if the inner surface of the bottom sheet 11 and the inner surface of the top sheet 12 are formed so as to have heat weldability, the inner surfaces of the bottom sheet 11 and the inner surfaces of the top sheet 12 can be bonded together. Therefore, the lower bonding hole 11a and the upper bonding hole 12a can be omitted.

  -The shape of the front upper adhesion part 22 and the rear upper adhesion part 25 is not restricted to the thing of the said embodiment. For example, the arc-shaped portions of the upper adhesive portions 22 and 25 may be formed in a straight line instead of a curve, and may be formed in a trapezoidal shape or an inverted V shape in which the left and right widths become narrower toward the top. Or it is good also as the linear upper adhesion parts 22 and 25 which eliminated the circular arc-shaped part and edged the upper edge of the main-body part 10. FIG. Similarly, the shape of the lower adhesive portion 21 can be changed.

In the above embodiment, as shown in FIG. 3, the upper adhesive portion 22 is such that the intersection N between the inner edges of the upper adhesive portions 22 and 25 and the inner edge of the side adhesive portion 28 is located on the fold of the top sheet 12. 25 shapes were set. About the shape of this upper adhesion parts 22 and 25, as shown in FIG. 8, you may change so that the intersection N may be located below the crease | fold of the top sheet | seat 12. As shown in FIG. In this case, the intersection M between the inner edges of the upper adhesive portions 22 and 25 and the fold line of the top sheet 12 is located on the inner side of the inner edge of the side adhesive portion. And a protrusion 48 to which the rear sheet 14 is directly bonded. There is a difference in the thickness of the main body 10 in the vicinity of the boundary between the four-layer portion composed of the front sheet 13, the rear sheet 14, and the folded-up top sheet 12 and the two-layer portion composed of the front sheet 13 and the rear sheet 14. Therefore, the adhesive force by heat welding tends to be weak. The protrusion 48 is located in the vicinity of the boundary between the four-layer portion and the two-layer portion, exhibits an adhesion reinforcing effect in the vicinity of the boundary, and suitably suppresses the breakage of the self-standing packaging bag. Similarly, the lower bonding portion 21 can be provided with a protruding portion 48.

In the case of the embodiment shown in FIG. 3, from the arcuate portions of the upper adhesive portions 22 and 25 to the side, that is, from the intersection N between the inner edge of the upper adhesive portions 22 and 25 and the inner edge of the side adhesive portion 28 to the side. The shape of the upper adhesive portions 22 and 25 is formed so as to extend along the crease of the top sheet 12, but it is possible to change the height position so as to be positioned on the upper side and the lower side. . Such a change is the same in the embodiment shown in FIG. 8, and the shapes of the upper adhesive portions 22 and 25 may be set so as to extend laterally from the intersection N. The shape of the upper adhesive portions 22 and 25 extending laterally from the intersection N between the inner edge of the upper adhesive portions 22 and 25 and the inner edge of the side adhesive portion 28 is inclined with respect to the vertical direction of the main body portion 10. Alternatively, it may be curved.

In the above embodiment, two sheets of the front sheet 13 and the rear sheet 14 are adopted as the side sheets, but the number of the side sheets is not limited to two. For example, as shown in FIG. 9 , it is also possible to employ four side sheets 52 as the side sheets. Specifically, the peripheral edge of the quadrangular bottom sheet 51 and the lower edges of the four quadrangular side sheets 52 are bonded to form the lower adhesive portion 55. Further, the side edges of the adjacent side sheets 52 are bonded to form the side bonding portion 56. Then, the upper edge of the four side sheets 52 and the peripheral edge of the top sheet 53 are bonded to form the upper bonding portion 57. A square tubular self-supporting packaging bag can be obtained by interposing the mouthpiece 30 in the central adhesive portion 58 of the central adhesive portion 58 and the side adhesive portions 59 of the upper adhesive portion 57. In addition, what is necessary is just to employ | adopt a triangular bottom sheet | seat and a top sheet | seat, when employ | adopting 3 side sheets.

In the above-described embodiment, the mechanism including the suction nozzle 44 is exemplified as the standing operation device. However, various mechanisms that can raise the upper adhesive portion may be employed. For example, a plate may be inserted between the front upper adhesive portion 22 and the rear upper adhesive portion 25, that is, between the folded top sheet 12, and the plate may be turned upright to rotate .

  In the above embodiment, the fold of the top sheet 12 is used as a reference when the rear upper adhesive portion 25 is raised in the opening sealing step S4 and the mouthpiece adhering step S5. However, this reference can be changed. . For example, the rear upper adhesive portion 25 above the upper adhesive hole 12a may be erected on the basis of the position where the upper adhesive hole 12a is formed.

  In the above embodiment, the side adhesive portions 24 and 27 and the central adhesive portions 23 and 26 are set to overlap each other in the front and rear upper adhesive portions 22 and 25. However, the degree of overlap is changed. Is possible. For example, the length in the width direction of the central adhesive portions 23 and 26 may be the same as the width of the front sheet 13 and the rear sheet 14, or the central adhesive portions 23 and 26 completely connect the side adhesive portions 24 and 27. You may make it cover.

  In the above embodiment, the side adhesion step S2 is performed after the lower adhesion step S1, but the lower adhesion step S1 may be performed after the side adhesion step S2. Alternatively, the lower adhesion step S1 and the side adhesion step S2 may be performed simultaneously. For example, the integrated heat welding having both the contact surface of the lower heat welding means used in the lower bonding step S1 and the contact surface of the side heat welding means used in the side bonding step S2. By using the means, the lower bonding step S1 and the side bonding step S2 can be performed simultaneously. In the above embodiment, the first side bonding step S3 is performed after the lower bonding step S1 and the side bonding step S2. However, the lower bonding step S1 and the side bonding step S2 are performed after the first side bonding step S3. May be. Thus, the order of the lower bonding step S1, the side bonding step S2, and the side bonding first step S3 may be freely changed.

  The opening sealing step S4 may be performed after the order of the opening sealing step S4 and the mouthpiece bonding step S5 is changed and the mouthpiece bonding step S5 is performed. If the separation length between the front upper adhesive portion 22 and the rear upper adhesive portion 25 is secured so that the operation by the opening heat welding means 45 and the operation by the mouthpiece heat welding means 46 do not interfere with each other, the opening sealing is performed. It is also possible to execute step S4 and mouthpiece bonding step S5 at the same time.

  In the above embodiment, the front sheet 13 and the rear sheet 14 are set to have a vertical relationship in the opening sealing step S4 and the mouthpiece bonding step S5, but this set state can be changed. For example, both the front sheet 13 and the rear sheet 14 are allowed to stand and the both processes can be executed.

  -In side adhesion 2nd process S6 of the said embodiment, it was made to pinch | interpose the site | part etc. in which the top | upper surface sheet | seat 12 was pinched among the side edge area | regions of the front sheet | seat 13 and the back sheet | seat 14. You may change this so that the whole side edge area | region of the front sheet | seat 13 and the rear sheet | seat 14 may be pinched | interposed. In this case, in the side edge regions of the front sheet 13 and the rear sheet 14, the part where the bottom sheet 11 is sandwiched is also heated in each of the lower bonding step S1, the side bonding first step S3, and the side bonding second step S6. Under the action of welding, a triple adhesion structure is formed. The contact surface of the second side heat welding means 47 used in the second side bonding step S6 can be changed in any way as long as it is at least large enough to cover the upper bonding hole 12a.

-Adhesion of each sheet is not limited to thermal welding, and may be changed to, for example, adhesive bonding, ultrasonic bonding, high-frequency bonding, or the like.
In the above embodiment, the front upper adhesive portion 22 and the rear upper adhesive portion 25 are separated from each other by bending the rear upper adhesive portion 25 upward in the opening sealing step S4 and the mouthpiece adhering step S5. You may change this space | interval structure. For example, the front upper adhesive portion 22 may be changed to be bent downward, or the rear upper adhesive portion 25 may be bent upward and the front upper adhesive portion 22 may be bent downward. Moreover, in the said embodiment, it is made | formed by the inner surface by the side of the back upper adhesion part 25 of the top | upper surface sheet | seat 12 which bent and stood up, and the inner surface by the side of the front upper adhesion | attachment part 22 of the top | upper surface sheet | seat 12 which is horizontal. Although the angle is set to approximately 90 degrees, the angle can be changed. For example, the angle may be smaller than 90 degrees (for example, 45 degrees). If the rear upper adhesive portion 25 is bent upward and the front upper adhesive portion 22 is bent downward, it can be larger than 90 degrees (for example, 180 degrees).

  -You may change the execution step of opening sealing process S4. For example, it is also possible to execute before and after the lower bonding step S1, after the side bonding step S2, or after the side bonding first step S3. Each sheet at such a stage remains formed in a band shape, and an upper heat insulating sheet 42 is inserted between the top sheet 12 folded in two. In this state, the front center adhesive portion 23 is formed by heating only from the front sheet 13 side while sandwiching the front sheet 13 and the rear sheet 14 by the heat welding means. In this case, the front center adhesive portion 23 may appropriately change the length of each strip-shaped sheet in the longitudinal direction (the width direction of the main body 10). For example, the top surface extends in a straight line with respect to the strip-shaped sheet. The front center bonding portion 23 may be formed by bonding the sheet 12 and the front sheet 13. In addition, if the opening sealing step S4 is performed after the side bonding step S2, at least a non-adhesion area between the front sheet 13 and the top sheet 12 portion on the front sheet 13 side is targeted (the mouthpiece 30). The front center adhesive portion 23 may be formed by bonding the top sheet 12 and the front sheet 13 to a non-adhesive region or the like where no intervening material is present. According to such a manufacturing process, an operation in performing the mouthpiece bonding step S5, for example, a separation operation between the front upper bonding portion 22 and the rear upper bonding portion 25, or opening the non-bonding area. It is possible to arrange the device configuration for performing the mouthpiece supply operation and the like for supplying the head with a margin.

  The lower bonding step S1, the side bonding step S2, the side bonding first step S3, the opening sealing step S4, the mouthpiece bonding step S5, and the side bonding second step S6 are performed according to the technical common sense of those skilled in the art. It is possible to rearrange the order as appropriate. Although this point is also exemplified above, the present invention is not limited to this, and is added here.

Next, a technical idea that can be grasped from the above-described embodiment and modified examples will be described below.
-The bottom sheet and the lower region of at least two side sheets of the first side sheet and the second side sheet sandwiching the bottom sheet are bonded to form a lower adhesive portion, and the top sheet and the top sheet are sandwiched In the self-standing packaging bag formed in a cylindrical shape by bonding the upper region of the side sheet to form an upper adhesive portion, and forming side adhesive portions by bonding the side edge regions of the side sheet, The first upper adhesive part to which the first side sheet and the top sheet are bonded has a non-adhesive area at the center thereof, and the second upper adhesive part to which the second side sheet and the top sheet are bonded. Is a self-supporting packaging bag characterized by having a non-adhesive area in the center.

  -The bottom sheet and the lower region of at least two side sheets of the first side sheet and the second side sheet sandwiching the bottom sheet are bonded to form a lower adhesive portion, and the top sheet and the top sheet are sandwiched In the self-standing packaging bag formed in a cylindrical shape by bonding the upper region of the side sheet to form an upper bonding portion, and bonding the side edge regions of the side sheet to each other to form a side bonding portion The first upper adhesive portion to which the first side sheet and the top sheet are bonded includes a central adhesive portion provided including a central region in the width direction of the first side sheet and the width direction of the first side sheet. A side adhesive portion provided in a side region, and the second upper adhesive portion to which the second side sheet and the top sheet are bonded has a non-adhesive region at the center in the width direction of the second side sheet. Self characterized by The packaging bag.

  The bottom sheet folded in half and the pair of side sheets sandwiching the bottom sheet are bonded to form a lower adhesive portion, and the side edge regions of the side sheets are bonded to each other to form a side adhesive portion. In the self-supporting packaging bag formed in a bag shape, the intersection of the inner edge of the lower adhesive portion and the inner edge of the side adhesive portion is positioned above the fold of the bottom sheet, and the pair of side sheets are bonded to the lower adhesive portion. The self-supporting packaging bag characterized by the above-mentioned protrusion part being formed.

  -The bottom sheet and the lower region of at least two side sheets of the first side sheet and the second side sheet sandwiching the bottom sheet are bonded to form a lower adhesive portion, and the top sheet and the top sheet are sandwiched The upper region of the side sheet is bonded to form an upper bonding portion, the side edge regions of the side sheet are bonded to each other to form a side bonding portion, and the upper bonding portion is A mouthpiece that includes a central adhesive portion that includes a central region in the width direction of the side sheet and a side adhesive portion that is provided in a lateral region in the width direction of the side sheet, and that allows distribution of contents. A method of manufacturing a self-supporting packaging bag, wherein the upper adhesive portion composed of the top sheet and the first side sheet is bonded to a region including the center in the width direction of the side sheet, and is bonded to the center of the upper adhesive portion. Opening seal forming part And a mouth bonding step for forming a central bonding portion in which the mouth is interposed in an upper bonding portion composed of the top sheet and the second side sheet. In the mouth bonding step, Bending at least one of the upper adhesive portions so that the upper adhesive portion consisting of the face sheet and the first side sheet and the upper adhesive portion consisting of the top surface sheet and the second side sheet are separated from each other. A method for producing a self-supporting packaging bag.

The perspective view of the self-supporting packaging bag in embodiment. The disassembled perspective view of the self-supporting packaging bag in embodiment. The front view seen from the front sheet side of the self-supporting packaging bag in an embodiment. The flowchart of the manufacturing method in embodiment. The schematic diagram at the time of joining each sheet | seat of the manufacturing method in embodiment. (A), (b), (c), (d) is a schematic diagram which shows the opening sealing process and mouthpiece adhesion process of the manufacturing method in embodiment. The perspective view of the self-supporting packaging bag in the example of a change. The partial front view of the self-supporting packaging bag in the example of a change. The perspective view of the self-supporting packaging bag in the example of a change.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Main part, 11 ... Bottom sheet, 12 ... Top sheet, 13 ... Front sheet as first side sheet, 14 ... Rear sheet as second side sheet, 21 ... Lower adhesive part, 22 ... As upper adhesive part , Front upper adhesive part, 23 ... front central adhesive part, 24 ... front side central adhesive part, 25 ... rear upper adhesive part as upper adhesive part, 26 ... rear central adhesive part, 27 ... rear side adhesive part, 28 ... side Bonding part, 30 ... mouthpiece, S1 ... lower bonding step, S2 ... side bonding step, S3 ... side bonding first step, S4 ... opening sealing step S5 ... mouth bonding step, S6 ... side bonding second step.

Claims (5)

The bottom sheet and the lower region of at least two side sheets of the first side sheet and the second side sheet sandwiching the bottom sheet are bonded to form a lower adhesive portion, and the top sheet and the top sheet are sandwiched between the top sheet and the top sheet The upper region of the side sheet is bonded to form an upper bonding portion, the side edge regions of the side sheet are bonded to each other to form a side bonding portion, In a self-supporting packaging bag provided with a mouthpiece that allows distribution,
The upper adhesive part includes a central adhesive part provided including a central region in the width direction of the side sheet and a side adhesive part provided in a lateral region of the side sheet, the central adhesive part and the The side adhesive part is formed so as to overlap the side adhesive part, and the side adhesive part includes the first side adhesive part formed by adhering the first side sheet and the top sheet, the second side sheet, and the top sheet. And the second side adhesive part and the second side adhesive part are arranged to face each other, the adhesive region of the first side adhesive part and the second side adhesive part Are formed in the same size as the adhesive region, and the mouthpiece includes the central adhesive portion to which the first side sheet and the top sheet are bonded, and the second side sheet and the top sheet. Is interposed in at least one of the central adhesive portions to be bonded Self-standing packaging bag and butterflies.   2. The self-supporting packaging bag according to claim 1, wherein, in the side edge region of the side sheet, the side adhesive portion at a portion where the top sheet is sandwiched has a triple adhesion structure formed by at least three times of adhesion. In a method for manufacturing a self-supporting packaging bag, wherein a bottom sheet, a top sheet, a first side sheet, and a second side sheet are formed in a cylindrical shape and provided with a mouthpiece that allows distribution of contents. ,
A lower bonding step of forming a lower bonding portion by bonding the bottom sheet and a lower region of the side sheet sandwiching the bottom sheet;
Between the top sheet and the upper region of the first side sheet and between the top sheet and the second region of the second side sheet, a non-adhesive region is provided at the center in the width direction of the side sheet. A side adhesion step for adhering the widthwise side regions of the side sheets to form the side adhesion part of the upper adhesion part while preventing the top sheet from adhering to each other;
Adhering between the top sheet and the first side sheet and between the top sheet and the second side sheet at a portion where the top sheet is sandwiched in the side edge region of the side sheet However, in the said part, while making the said top sheet | seats mutually adhere, the side adhesion | attachment which adhere | attaches the side edge area | region of said 1st side sheet and 2nd side sheet mutually, and forms a side adhesion part in another part The first step,
An opening sealing step of bonding a region including the center in the width direction of the side sheet of the upper adhesive part made of the top sheet and the first side sheet to form a central adhesive part of the upper adhesive part,
A mouth bonding step of forming a central adhesive portion of the upper adhesive portion by adhering the non-adhesive region while fitting the mouth portion into the non-adhesive region of the upper adhesive portion comprising the top sheet and the second side sheet; ,
Of the side edge regions of the side sheet, a side adhesion second step of forming the side adhesion part by bonding the side sheets to each other at a portion sandwiching the top sheet,
A side adhesion part formed in the side adhesion process, and a side adhesion part formed in the side adhesion process. As a part, a first side adhesive part formed by bonding the first side sheet and the top sheet and a second side adhesive part formed by bonding the second side sheet and the top sheet are formed. is, above the first side bonded portion and the second side bonded portion is opposed, Ru is formed in the same size and the first side bonded portion of the bonding region and the bonding region of the second side bonding portion The manufacturing method of the self-supporting packaging bag characterized by the above-mentioned.   In the mouthpiece adhering step, at least one of the upper adhesive portion composed of the top sheet and the first side sheet and the upper adhesive portion composed of the top sheet and the second side sheet is separated from each other. 4. The method for manufacturing a self-supporting packaging bag according to claim 3, wherein one upper adhesive portion is bent.   Of the side edge region of the side sheet, the side adhesive portion of the portion where the top sheet is sandwiched is bonded to at least three times of the side bonding step, the side bonding first step, and the side bonding second step. The method for producing a self-supporting packaging bag according to claim 3, wherein the method is provided.