JP2018024472A - Gazette bag body for forming gazette bag with spout - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gazette bag body for forming a gazette bag with a spout, which enables easy, efficient, and high-yield production of a gazette bag that has high fixed strength in a fixed part of the spout and that prevents leakage of contents even if pressure is applied to the bag.SOLUTION: In a gazette bag body 1, gazettes on both left and right sides are formed by sandwiching two-folded materials 3a, 3b between the surface and rear body materials and on the left and right sides. Respective portions, near the upper ends, of the left and right folded materials 3a, 3b are heat sealed to the rear face of the rear body material 2b by using a belt portion 10 made of synthetic resin having a constant length.SELECTED DRAWING: Figure 1

Description

  In the present invention, a synthetic resin spout (extraction member) is fixed to the upper portion of a gusseted bag made of a synthetic resin sheet, and various liquids and powders such as foods, chemicals, cosmetics, and detergents are used. The present invention relates to a gusset bag for forming a spouted gusset bag used as a packaging bag.

  Conventionally, as packaging bags for various liquids and powders such as food, medicine, cosmetics, and detergents, various pouch bags and gusset bags formed on sheets of synthetic resin films and laminated films (on both the left and right sides) So-called gussets) are widely used, and a pouch bag or spout with a spout in which a hard synthetic resin spout (pouring member) is fixed to the upper edge of the pouch bag or gusset bag. An attached gusset bag is also used (Patent Document 1).

  Such a spouted gusset bag can be produced by placing the synthetic resin sheet folded in half between the left and right ends of the two synthetic resin sheets on the left and right sides of the synthetic resin sheet laminate. And heat-sealing the bottom part to form a gusseted three-sided bag, and then inserting the adhesive part provided at the base end of the spout into the opening of the three-sided bag, and the front and back of the synthetic resin sheet laminate A method is adopted in which two synthetic resin sheets are fused to the bonding portion.

JP 2011-31895 A

  However, in the method for manufacturing a gusset bag with a spout as described in Patent Document 1, when the spout is fixed to the opening of a three-sided bag with a gusset, the width of the opening is too wide and the gusset is configured. Since the synthetic resin sheet and the synthetic resin sheets on the front and back sides slide against each other, it is very difficult to align the spout. For this reason, the spout is not fused at an appropriate position, so that a situation occurs in which the fusion strength between the spout and the front and back synthetic resin sheets is lowered.

  The object of the present invention is to solve the problems of the conventional method for manufacturing a gusset bag with a spout, and the fixing strength (fusion strength) of the fixing portion of the spout is high, so that the content leaks even when pressure is applied. It is an object of the present invention to provide a gusset bag body for forming a gusset bag with a spout, which can easily and efficiently produce a gusset bag which is not made with good yield.

  Of the present invention, the invention described in claim 1 is formed in a bag shape having gussets on the left and right sides by a synthetic resin sheet, and has an opening for inserting and fixing a spout made of synthetic resin. A gusset bag body for forming a gusset bag with a spout provided in the approximate center of the head, formed by sandwiching folded folds on the left and right sides of the front and back body parts, respectively. In addition, the upper end portion of each of the left and right folding members is heat-sealed on the back surface of the front and back body members by a band-shaped member made of synthetic resin and having a certain width. It is.

  In the invention described in claim 2, in the invention described in claim 1, the upper end portions of the left and right folding members are heated together on the back surface of either the front or back body by a single band-shaped member. It is characterized by being sealed.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the heights of the upper edge of the left and right folding members, the upper edge of the belt-like member, and the upper edge of the front and back body members The positions are the same.

  The invention described in claim 4 is characterized in that, in the invention described in any one of claims 1 to 3, the distance between the left and right folding members is smaller than the width of the fixing portion of the spout to be attached. Is.

  The gusset bag body for forming a spouted gusset bag according to claim 1 (hereinafter, simply referred to as a gusset bag body) is a back surface of one of the front and back of the upper and lower folding members at the upper end portions of the left and right folding members. When the spout is fixed (fused) to the upper edge, the opening can be enlarged and the spout to be fixed does not interfere with the left and right folding materials. Can be efficiently and easily performed.

  The gusset bag according to claim 2 is manufactured because the left and right folding parts at the upper end are heat-sealed together on the back surface of either the front or back body by a single band-shaped member. Since the left and right folded materials can be heat-sealed to the body in a single heat-sealing process, they can be manufactured easily and inexpensively. In addition, since the left and right folding materials are heat-sealed together on the back surface of either the front or back body, it is easy to open the opening during the spout fixing operation (so as not to be distorted on the left and right).

  In the gusset bag according to claim 3, since the height positions of the upper edge of the left and right folding members, the upper edge of the belt-like member, and the upper edge of the upper and lower body members are the same, Since it is not necessary to heat a portion other than the upper end of the material, it is possible to effectively prevent the occurrence of distortion or the like in the printing of the front and back body materials.

  In the gusset bag according to claim 4, the gap between the left and right folding members is smaller than the width of the fixed portion of the spout to be attached. Therefore, the gusset bag with the spout formed from the gusset bag is the fixed portion of the spout. Because the synthetic resin sheet located on the outer side of the left and right edges of the wall is thick and difficult to bend, the spout does not wobble when pouring the contents such as the liquid filled inside from the spout to the outside The contents can be poured out smoothly.

It is explanatory drawing (front view) which shows a gusset bag body. It is explanatory drawing which shows a gusset bag (a is an AA line end view in FIG. 1, b is a BB line end view in FIG. 1, c is an enlarged view of the circular part in b, d is an end view taken along the line CC in FIG. It is explanatory drawing which shows a spout (a is a front view, b is a bottom view, c is a side view). It is explanatory drawing (front view) which shows the gusset bag body which fixed the spout. It is explanatory drawing (DD line end surface figure in FIG. 4) which shows the gusset bag body which fixed the spout. It is explanatory drawing (perspective view) which shows the gusset bag body which fixed the spout. It is explanatory drawing which shows the example of a change of a gusset bag body (a is a front view, b is an EE front end view in a). It is explanatory drawing (perspective view) which shows the gusset bag body (modified example) to which the gusset bag body was fixed. It is explanatory drawing (front view) which shows the example of a change of a gusset bag body. It is explanatory drawing (front view) which shows the example of a change of a gusset bag body. It is explanatory drawing (front view) which shows the example of a change of a gusset bag body.

  The gusset bag according to the present invention is formed of a synthetic resin sheet. The synthetic resin sheet here is a laminated film obtained by laminating a synthetic resin film used as a packaging material for food, medicine, cosmetics, detergents, etc., or a laminated film obtained by laminating a synthetic resin film and paper, aluminum foil, etc. That is. The synthetic resin sheet used for the gusset bag according to the present invention needs to have at least one surface (inner surface) having thermal adhesiveness.

  As such a synthetic resin sheet, a laminate film obtained by laminating a thermal adhesive film such as a polyethylene film or a polypropylene film on a base film such as a polyester film, a nylon film, or a polypropylene film can be suitably used. In addition, a laminate film having three or more layers in which a polyester film, a nylon film or the like is sandwiched between such laminate films can also be suitably used.

  The base film or the film forming the intermediate layer can be an unstretched film, or a uniaxially stretched film or a biaxially stretched film. In addition, metal foil may be used as necessary at the interface between the base film and the heat-adhesive film, the interface between the base film and the film forming the intermediate layer, and the interface between the film forming the intermediate layer and the heat-adhesive film. It is also possible to provide a layer or a metal vapor deposition layer. On the other hand, the thickness of the synthetic resin sheet is not particularly limited, but is preferably 40 to 250 μm and more preferably 110 to 180 μm from the viewpoints of storage performance with respect to the contents, tear resistance against breakage, and the like.

  In the gusset bag according to the present invention, the above-mentioned synthetic resin sheet is laminated in such a manner that the folded material is sandwiched between the left and right body members on the front and back sides, and the lower part (bottom part) and the side part of the laminated body are formed. Manufactured by heat-sealing into a bag. Moreover, when making a bag in that way, it is necessary to heat-seal the upper end portions of the left and right folding members to the back surfaces of the front and back body members by using a band-shaped member made of synthetic resin and having a certain width.

  Each heat seal (formation of the side seal portion, bottom seal portion, heat seal of the belt-shaped member, etc.) and cutting can be carried out as a series of processing using a gusset bag making machine, or batch (non- It is also possible to carry out as a series of processing. In addition, the temperature of heat sealing is not particularly limited, but when a synthetic resin sheet using a polyethylene (linear low density polyethylene) film as a heat-adhesive film is used, the temperature is within a range of 170 to 210 ° C. Is preferred.

  Further, the gusset bag according to the present invention is formed in a substantially rectangular shape when viewed from the front, but the size is not particularly limited, and the height and width are adjusted within a range of approximately 50 to 350 mm as necessary. can do. Further, the gusset bag according to the present invention is provided with gussets (portions folded inwardly in both directions) on both the left and right sides, but the width of the gusset (width of the bifold portion) is also particularly limited. It can adjust as needed within the range of 10-75 mm in general.

  On the other hand, when forming a gusset bag with a spout using the gusset bag according to the present invention, a spout formed of a synthetic resin is fixed inside the opening of the gusset bag formed as described above ( Fusion). Such a spout can be suitably made of a hard synthetic resin or the like, and a spout body (a member in which an adhesive portion is connected to the lower portion of the spout portion) and a cap are separately molded 2 A piece type may be sufficient and the 1 piece type thing by which the spout body and the cap were integrally shape | molded via the thin part may be sufficient. The material of the spout body needs to be able to be thermally bonded (fused) with the heat-adhesive film of the gusset bag body, such as polyethylene (linear low density polyethylene, medium density polyethylene or high density). Polyethylene), polypropylene, polyester and the like.

<Configuration of gusset bag>
Hereinafter, one Example of the gusset bag body of this invention is described. FIGS. 1 and 2 show a gusset bag body. The gusset bag body 1 is folded into front and back synthetic resin body materials 2a and 2b, left and right folding materials 3a and 3b, and a rear body material 2b. The belt-like members 10 for fusing the materials 3a and 3b are overlapped in a predetermined manner, and a predetermined portion is heat-sealed to form a bag shape having an open top.

  The front and back body materials 2a and 2b are made of a 15 μm thick nylon film (base film) and a 12 μm thick polyester film (intermediate layer) on which an aluminum vapor deposition surface is bonded to the nylon film. Is formed into a substantially rectangular shape by a synthetic resin sheet obtained by laminating a linear low density polyethylene film (thermoadhesive film) having a thickness of 130 μm thereon, and length × width = 240 mm × It has a size of 130 mm.

  Further, folding materials 3a and 3b formed of the same synthetic resin sheet as the body materials 2a and 2b are respectively provided on the left and right side portions of the body materials 2a and 2b with a predetermined width (about 40 mm width). It is sandwiched in a folded state. The front and back body materials 2a and 2b are respectively arranged with the linear low-density polyethylene film (thermal adhesive film) layer inside, and the folding materials 3a and 3b are linear low-density polyethylene films. It arrange | positions in the state which made the layer into the back surface side of body material 2a, 2b of front and back. In addition, the side edges of the left and right folding members 3a and 3b that are not on the side of the folding ridge line (that is, the left edge at the upper end of the left folding member 3 and the right edge at the upper end of the right folding member 3b) On the other hand, through-holes 17 and 17 are provided so as to pass through the two folding materials 3a and 3b, respectively.

  Further, in the portion at the upper end of the gusset bag body 1, the folding members 3 a and 3 b are fixed to the inner surface of the back body member 2 b by the belt-like member 10. The belt-like member 10 has a three-layer structure in which a linear (linear) low-density polyethylene (LLDPE) film having a thickness of 20 μm is laminated on top and bottom of a nylon film (base film) having a thickness of 15 μm. By the resin sheet, it is formed in a strip shape (tape shape) of length (vertical width) × width = 30 mm × 130 mm (that is, the strip-like member 10 has both sides of the surface having thermal adhesiveness).

  And in the part near the upper end of the gusset bag 1, the band-like member 10 is heated from the outside of the body 2b on the back side while being pressed against the folding materials 3a and 3b from the inside, thereby folding the folding material. It is heat-sealed to 3a, 3b and the body material 2b on the back side. That is, as shown in FIG. 2 (b), the outer surface of the belt-like member 10 and the back surface (inner surface) of the body member 2b are fused at the center portion at the upper end of the gusset bag body 1, and the gusset bag body. In the left and right portions near the upper end of 1, the outer surface of the belt-like member 10 and the back surfaces of the folding members 3 a and 3 b are fused together. Further, on the outer side of the belt-like member 10 fused with the back surfaces of the folding materials 3a and 3b, the back surface (inner surface) of the back body 2b and the back surfaces of the folding materials 3a and 3b are fused. . Further, in the through holes 17 and 17 of the left and right folding members 3a and 3b, the outer surface of the belt-like member 10 and the back surface of the body member 2b are directly fused. As described above, in the portion near the upper end of the gusset bag body 1, the left and right folding members 3 a and 3 b are heat-sealed to the back side body material 2 b by the belt-like member 10. An opening 9 having a large area for adhering (fusing) the spout is formed between the member 10 and the member 10.

  On the other hand, in the laminated portion of the body materials 2a, 2b and the folding materials 3a, 3b at the left and right side edges of the gusset bag body 1, there are strip-shaped side seal portions 5, 5,. In the side seal portions 5, 5..., The back surface of the front-side body material 2 a and the back surfaces of the folding materials 3 a and 3 b, and the back surface of the back-side body material 2 b and the folding materials 3 a and 3 b The back sides are fused together. Further, the body 2a and the belt-like member 10 are fused together at the front end (body 2a side) of the side seal portions 5, 5.

  Further, at the edge of the lower end of the gusset bag body 1, a bottom seal portion 7 is formed in a belt shape having a substantially constant height (about 13 mm), and a portion near the lower end of the side seal portions 5, 5. They are overlapping. And, in the central portion of the bottom seal portion 7, the back side of the front side barrel 2a and the back side of the back side barrel 2b are fused together, The back surfaces of the body materials 2a and 2b and the back surfaces of the folding materials 3a and 3b are fused together.

  Further, at the edge of the left and right lower ends of the gusset bag body 1, strip-shaped inclined seal portions 20 each having a constant width (about 7 mm) so as to reach the bottom seal portion 7 from the left and right side seal portions 5, 5. , 20... Are provided, and the inclined seal portions 20, 20... Are inclined by about 45 ° with respect to the horizontal direction. Further, the outer edge of the inclined seal portion 20, 20,... Overlaps with the side seal portion 5, 5, .., and the inner edge (lower end edge) of the inclined seal portion 20, 20,. Is overlapped with the bottom seal portion 7.

  Further, spot fused portions 19 and 19 are provided at the portions (gusset portions) at the left and right ends of the bottom seal portion 7, respectively. In the spot fusion | bond part 19 and 19, the through-hole (not shown) is provided so that the folding materials 3a and 3b folded in half may be penetrated, and the body 2a of the front side is provided through those through-holes. And the back surface of the body 2b on the back side are directly fused together.

<Usage of gusset bag>
(1) Formation of gusset bag with spout The gusset bag body 1 formed as described above can be used as a gusset bag with a spout by fixing the spout to the opening 9 at the upper end. FIG. 3 shows a spout to be fixed to the gusset bag body 1. The spout 11 is a so-called two-piece type in which the spout body 12 and the cap 13 are separately formed, and both the spout body 12 and the cap 13 are made of polyethylene. The spout body 12 has a four-layered adhesive portion 15 (adhered portion) connected continuously to the lower portion of the spout portion 14 for extracting contents, and the horizontal cross section for fusing with the gusset bag body. Has been. And the extraction hole 18 is provided so that those spout bodies 12 and the adhesion part 15 may be penetrated up and down. Further, thin plate-like fusion assisting pieces 16, 16 are provided on the left and right sides of the bonding portion 15. The bonding portion 15 has a height of about 10 mm.

  When the spout 11 is fixed (fused) to the gusset bag body 1, the adhesive portion 15 of the spout 11 is inserted between the two front and back body materials 2 a and 2 b at the opening 9 of the gusset bag body 1. Then, a hot plate provided with a concave curved surface heated to a predetermined temperature (about 210 ± 5 ° C.) is pressed on the body materials 2a and 2b located outside the bonding portion 15 to bond the spout 11 15 and the back surfaces of the body materials 2a and 2b are fused (heat sealed). That is, the horizontally long strip-shaped upper seal portion 8 is formed so as to overlap the left and right side seal portions 5 and 5 by heat-sealing the upper end portion of the gusset bag body 1 with a constant width.

  When the spout 11 is fixed, the left and right folding members 3a and 3b are fixed to the trunk 2b by the belt-like member 10 in the vicinity of the opening 9 in the gusset bag body 1, so Since the material does not get in the way (does not interfere) (that is, the area of the opening 9 is wide), the spout 11 can be fixed very easily. Moreover, the clearance gap which leaks the content filled later is not produced around the spout 11 to which it adheres.

  FIGS. 4-6 shows the gusset bag with a spout formed by making the spout 11 adhere to the gusset bag body 1. FIG. The spout-attached gusset bag 21 has the adhesive portion 15 of the spout 11 and the back surface of the body 2a fused together on the front side of the body 2a, and the spout 11 is bonded to the back side of the body 2b. The part 15 and the inner surface of the belt-like member 10 are fused together.

(2) Filling contents The spouted gusset bag 21 formed as described above is used by filling the contents (for example, shampoo, etc.) from the extraction hole 18 of the spout 11. When the liquid is filled in such a manner, the intermediate portions (portions other than the edges of the upper and lower edges) of the folded materials 3a and 3b which are folded in two are expanded, and the left and right front and rear inclined seal portions 20, 20,. At the upper end portion (ie, the portion where the side seal portions 5, 5,... And the inclined seal portions 20, 20,... Overlap), the body 2a and the body 2b are bent together with the folding materials 3a, 3b. In order to form a horizontally long rectangular bottom, the lower part has a substantially rectangular parallelepiped shape (lateral width × depth = about 130 mm × about 80 mm). Therefore, the spouted gusset bag 21 can be raised in a stable state and can be used for display or the like as a product.

<Effects of gusset bag>
The above-described gusset bag 1 is formed by sandwiching folded materials 3a and 3b that are folded in two on the left and right sides of the front and back body members, and the left and right folded materials. When the upper end of 3a, 3b is heat-sealed to the back surface of the body member 2b on the back side by a band-shaped member 10 made of synthetic resin and having a certain width, the spout 11 is fixed (fused) to the upper edge. Furthermore, since the opening 9 can be enlarged and the spout 11 to be fixed does not interfere with the left and right folding members 3a and 3b, the fixing operation of the spout 11 can be performed efficiently and easily.

  In addition, the gusset bag 1 is heat-sealed at the upper end of the left and right folding members 3a and 3b together with the back surface of the body 2b on the back side by a single band-like member 10, so that In this heat sealing step, the left and right folding materials 3a and 3b can be heat sealed to the body material 2b, so that they can be manufactured easily and inexpensively. In addition, since the left and right folding members 3a and 3b are heat-sealed together on the back surface of the back body 2b, the opening 9 is opened (so as not to be distorted on the left and right) when the spout 11 is fixed. easy.

  Further, the gusset bag 1 is manufactured because the upper edge of the left and right folding members 3a and 3b, the upper edge of the belt-like member 10, and the upper edge of the upper and lower body materials 2a and 2b are the same. Sometimes it is not necessary to heat the portions other than the upper ends of the front and back body materials 2a and 2b, so that it is possible to effectively prevent the occurrence of distortion and the like in the printing of the front and back body materials 2a and 2b.

  In addition, in the gusset bag body 1, the distance between the left and right folding members 3 a and 3 b is uniform in the vertical direction, and the distance is the width (left and right width) of the adhesive portion 15 (fixed portion) of the spout 11 to be attached. (See FIG. 4 etc.). Accordingly, since the synthetic resin sheet positioned outside the left and right edges of the adhering portion 15 of the spout 11 is thick and difficult to bend, the spout-equipped gusset bag 21 spouts contents such as liquid filled inside. When pouring out from 11, the spout 11 does not wobble and the contents can be poured out smoothly.

<Example of changing the gusset bag>
The configuration of the gusset bag according to the present invention is not limited to the aspect of the above embodiment, and the material and size of the synthetic resin film (height, width, gusset width, etc.), bottom seal portion, Configurations such as the shapes of the side seal portion and the inclined seal portion can be appropriately changed as necessary without departing from the spirit of the present invention. For example, the synthetic resin sheet constituting the gusset bag body is not limited to a laminate of a nylon film, a polyester film, and a polyethylene film (linear low-density polyethylene film) as in the above-described embodiment. What laminated | stacked the synthetic resin film of the material may be used. In addition, when a laminate of a nylon film, a polyester film, and a polyethylene film (linear low density polyethylene film) is used as the synthetic resin sheet, the strength of the gusset bag body is good. In addition, the gusset bag body can be easily manufactured.

  Further, the gusset bag according to the present invention is not limited to the one provided with the inclined seal portion at the lower end as in the above embodiment, and gradually widens from the upper side to the lower side at the lower end of the left and right sides. A taper-shaped seal portion or the like may be used so that the front view is substantially triangular. Even when such a configuration is adopted, the gusset bag body expands the middle part of the folded material folded in half when the liquid is filled, and the body on the front and back sides of the upper end of the tapered seal part is left and right. In order to bend together with the folding material to form a horizontally long rectangular bottom surface, the lower portion has a substantially rectangular parallelepiped shape, so that it is possible to stand up in a stable state.

  Furthermore, the gusset bag according to the present invention has a folded portion formed only on the left and right sides of the body (that is, the folded material sandwiched only on the left and right sides of the body) as in the above embodiment, and the lower part of the body Further, it is also possible to have a fold portion (that is, a fold material sandwiched also in the lower part of the body). FIG. 7 shows an example of a gusset bag body in which folded portions are formed on the left and right and lower portions of the body, and the gusset bag body 1 'has portions at the lower ends of the left and right folded materials 3a and 3b, respectively. The cross section (vertical cross section) is bent obliquely inward so as to be M-shaped, and the same composition as the body materials 2a and 2b and the folding materials 3a and 3b is provided inside the bent portions F and F. The left and right ends of the lower folding member 4 formed by folding a horizontally long belt-shaped body formed of a resin sheet into two (so that the thermal adhesive surface is located outside) are sandwiched. And outside the bent portions F, F at the lower ends of the side seal portions 5, 5,..., The back surface of the body 2a and the back surfaces of the folding materials 3a and 3b, and the back surface of the body 2b and the folding materials 3a, The back surfaces of 3b are welded to each other, and inside the bent portions F and F, the back surfaces of the folding materials 3a and 3b and the back surface of the lower folding material 4 are fused. Further, the bottom seal portions 7 'and 7' are formed by heat-sealing the portion at the lower edge (the portion where the folding material 4 is sandwiched) into a belt having a constant height, and the back surface of the body 2a. And the back surface of the folding material 4 and the back surface of the body material 2b and the back surface of the folding material 4 are fused together.

  FIG. 8 shows a spouted gusset bag 21 ′ in which the spout 11 is fixed to the gusset bag body 1 ′ configured as described above. The spouted gusset bag 21 ′ is filled with the contents. Since the folded portions 3a and 3b of the folding material 3b are expanded to form a rectangular side surface, and the folding material 4 is expanded to form a rectangular bottom surface in the vicinity of the bottom portion, a very stable state is obtained. Can stand.

  Further, the gusset bag according to the present invention is not limited to one in which the left and right folding materials are heat-sealed to one (front side or back side) body material by a single band-like member as in the above embodiment. It is also possible to change the left and right folding materials to heat-sealed separate body materials by using the band-shaped members. Furthermore, when the left and right folding materials are heat-sealed to separate body materials, the left and right folding materials must be heat-sealed to the same body material (front or back side material). It is also possible to heat-seal the left and right folding materials to separate body materials (front or back body). Even when such a configuration is adopted, the gusset bag body can have a large opening when the spout is fixed (fused) to the upper end edge, and the spout can be easily fixed.

  Furthermore, the gusset bag according to the present invention is limited to those having the same height position of the upper edge of the left and right folding members, the upper edge of the belt-like member, and the upper edge of the front and back body members as in the above embodiment. The upper edge of the left and right folding material is lower than the upper edge of the front and back body, and the height position of the upper edge of the belt-like member is the same as the height position of the upper edge of the front and back body. The upper edge of the left or right folding material is lower than the upper edge of the front and back body, and the height position of the upper edge of the belt-like member is higher than the height position of the upper edge of the front and back body. It is also possible to change to a lower one.

  FIG. 9 shows that the upper edge of the left and right folding members is lower than the upper edge of the front and back body, and the height position of the upper edge of the belt-like member is higher than the height position of the upper edge of the front and back body. The lower gusset bag body is shown, and the gusset bag body 31 is a portion near the upper ends of the folding members 3a and 3b by the belt-like member 10 at a height position below the upper ends of the body materials 2a and 2b. In the state covered, the folding members 3a and 3b are fixed to the inner surface (back surface) of the body member 2b on the back side together with the belt-like member 10. That is, at the center of the upper portion of the gusset bag body 31 (the center in the left-right direction), the outer surface of the belt-like member 10 and the back surface (inner surface) of the body member 2b are fused together. , The outer surface of the belt-like member 10 and the back surfaces of the folding members 3a and 3b are fused together. Further, on the outer side of the belt-like member 10 fused with the back surfaces of the folding materials 3a and 3b, the back surface (inner surface) of the back body 2b and the back surfaces of the folding materials 3a and 3b are fused. . And in the upper part of the gusset bag 31, the left and right folding members 3a, 3b are heat-sealed by the strip member 10 to the back barrel 2b, so that the gap between the front barrel 2a and the strip member 10 is reduced. However, the opening 9 has a large area for filling the contents. When such a configuration is adopted, the gusset bag body 31 is configured such that the opening 9 is constituted only by the front and back body materials 2a and 2b, and the thickness of the synthetic resin sheet constituting the opening 9 is uniform. The spout can be fixed easily.

  In addition, the belt-like member is not limited to one made of a synthetic resin sheet having a three-layer structure in which an LLDPE film is laminated on the top and bottom of a nylon film (base film) as in the above-described embodiment, and different synthetic materials are used. It is also possible to change to a synthetic resin sheet made of resin. Furthermore, the layer structure and thickness of the belt-shaped member can be appropriately changed as necessary. Further, the belt-like member is not limited to a horizontally long and simple tape-like member as in the above-described embodiment, and may be a member in which the vertical width of a predetermined portion is different or a through hole is provided.

  On the other hand, the method for manufacturing a gusset bag with a spout using the gusset bag according to the present invention is provided with a spout at the opening of the head portion of the gusset bag body in which the side portion and the lower portion (bottom portion) are heat sealed as in the above embodiment. It is not limited to the manufacturing method to be fixed (fused), and the spout was fixed (fused) to the opening of the head of the gusset bag body in which only the side portions were heat sealed, and then opened (in an unheat sealed state). A method of heat-sealing the unheat-sealed part of the lower part after filling the contents from the lower part may be used. According to such a manufacturing method, it is possible to easily fill a content that is difficult to fill from a spout such as a high-viscosity content, and it is also possible to use a one-piece type or a check valve structure as the spout. It becomes possible. In addition, the gusset bag according to the present invention can be used with a spout fixed to the opening after filling the contents from the opening at the upper end.

  In addition, the gusset bag according to the present invention is either front or back in which the belt-like member is heat-sealed below each heat-sealed portion of the belt-like member and the left and right folding members for the purpose of improving the resistance to breakage when dropped. It is also possible to provide a reinforcing heat seal portion formed by heat sealing the body material and the left and right folding materials. Further, when the reinforcing heat seal portion is provided in the gusset bag body as described above, the reinforcing heat seal portion is formed at the intersection of the folding lines of the left and right folding materials and the lower edge of the heat seal portion of the belt-shaped member. Or the lower end edge of the reinforcing heat seal portion is provided so as to pass through the intersection of the respective folding lines of the left and right folding materials and the lower end edge of the heat seal portion of the belt-like member. Is preferred.

  FIG. 10 shows an example of a gusset bag body provided with a reinforcing heat seal portion as described above. The gusset bag body 41 is in a state in which the folding members 3a and 3b are fixed to the inner surface of the body member 2b on the back side by the belt-like member 10 at the upper end portion. Further, below the respective heat seal portions of the belt-like member 10 and the left and right folding members 3a and 3b, for reinforcement to increase the degree of thermal adhesion between the back side body material 2b and the left and right folding materials 3a and 3b, respectively. Heat seal portions 25a and 25b are provided. The reinforcing heat seal portions 25a and 25b have left and right folding members 3a and 3b placed on the back body 2b, and a belt-like member 10 placed on the upper ends of the folding materials 3a and 3b. After heat-sealing, from the outside of the left and right folding members 3a, 3b placed on the back body 2b (the inner edge of each reinforcing heat-seal portion 25a, 25b It is formed by pressing a hot plate (metal plate) heated to a predetermined temperature (about 210 ± 5 ° C.) from the outside. Each of the reinforcing heat seal portions 25a and 25b has a belt shape with a constant width (about 7.0 mm) and is inclined downward at an angle of about 45 ° from the center side to the outside.

  Further, each of the reinforcing heat seal portions 25a and 25b is in a state where the inner edge is positioned inside the folding line (ridge line) of each of the folding materials 3a and 3b, and the outer edge portion is at the edge. The left and right side seal portions 5 and 5 overlap each other. In addition, each of the reinforcing heat seal portions 25a and 25b has a slanted lower end edge when folded from the left and right folding materials 3a and 3b when viewed from a direction perpendicular to the surfaces of the front and back body materials 2a and 2b. The crossing points 26a and 26b between the line and the lower end edge of the heat seal portion of the belt-like member 10 are passed. In the reinforcing heat seal portions 25a and 25b, the back surface of the back body 2b and the back surfaces of the folding materials 3a and 3b are fused together.

  In the gusset bag body 41 configured as described above, the heat seal strength of each heat seal portion between the belt-like member 10 and the left and right folding members 3a and 3b is enhanced by the reinforcing heat seal portions 25a and 25b. The pressure of the generated contents is difficult to concentrate on the heat seal part between the belt-like member 10 and the left and right folding members 3a and 3b, and the sealing strength is good. There is no situation of leaking things. Further, since the reinforcing heat seal portions 25a and 25b have a lower end edge inclined downward from the center side to the outside, the gusset bag body 41 is folded when the content is taken out (poured out). It is hard to remain between the parts.

  In addition, when the gusset bag body is provided with the reinforcing heat seal portion as described above, the gusset bag body includes the upper edge of the left and right folding members, the upper edge of the belt-like member, and the front and back body materials. The height positions of the upper end edges of the upper and lower folding members are not limited to the same, and the upper end edges of the left and right folding members, the upper end edges of the belt-like members, and the upper end edges of the front and back body members may be different. FIG. 11 shows an example in which a reinforcing heat seal portion is provided in the gusset bag body in which the height positions of the upper edge of the left and right folding members, the upper edge of the belt-like member, and the upper edge of the front and back body materials are different. Yes, the gusset bag body 51 has the folding members 3a, 3b in a state where the upper end portions of the folding members 3a, 3b are covered by the belt-like member 10 at a height position below the upper ends of the body materials 2a, 2b. Is fixed to the inner surface (back surface) of the body member 2b on the back side together with the belt-shaped member 10. Then, below the heat seal portions of the belt-like member 10 and the left and right folding members 3a and 3b, respectively, similarly to the gusset bag body 41 of FIG. 10, the back side body material 2b and the left and right folding materials 3a and 3b, Reinforcing heat seal portions 25a and 25b are provided to increase the degree of thermal bonding.

  The gusset bag body 51 configured as described above is similar to the gusset bag body 41 of FIG. 10 in that each of the heat seal portions of the belt-like member 10 and the left and right folding members 3a and 3b by the reinforcing heat seal portions 25a and 25b. The heat seal strength is enhanced, and the pressure of the contents generated at the time of dropping is hard to concentrate on the heat seal portion between the belt-like member 10 and the left and right folding members 3a, 3b, and the sealing strength is good. Even if it happens, there will be no situation of breaking the bag and leaking the contents. Further, the gusset bag body 51 takes out the contents since the reinforcing heat seal portions 25a and 25b have a lower end edge inclined downward from the center side to the outside similarly to the gusset bag body 41 of FIG. It is difficult for the contents to remain between the folding parts during (pour out). In addition, the gusset bag body 51 has the opening 9 composed only of the front and back body materials 2a and 2b, and the synthetic resin sheet constituting the opening 9 has a uniform thickness, so that the spout can be easily fixed. It is.

  Since the gusset bag body of the present invention exhibits excellent effects as described above, it can be suitably used as a member or material for forming a gusset bag with a spout by fixing the spout.

1, 1 '··· Gazette bag body 2a, 2b · · Body 3a, 3b · · Folding material 9 · · Opening portion 10 · · Strip member 11 · · Spout 21, 21' · · Spouted gusset bag

Claims (4)

For forming a gusset bag with a spout, which is formed in a bag shape with gussets on the left and right sides by a synthetic resin sheet, and an opening for inserting and fixing a spout made of synthetic resin is provided in the approximate center of the head The gusset bag body,
The gussets on both the left and right sides are formed by sandwiching the folded material folded in half on the left and right sides of the front and back body,
A gusset for forming a gusset bag with a spout, characterized in that the upper end portion of each of the left and right folding materials is heat-sealed to the back of the front and back body members by a strip-shaped member made of a synthetic resin. Bag body.   2. The spouted gusset bag according to claim 1, wherein the upper end portions of the left and right folding members are heat-sealed together by a single belt-like member on the back surface of the front or back body. Gazette bag body.   The spout according to claim 1 or 2, wherein the upper edge of the left and right folding members, the upper edge of the belt-like member, and the upper edge of the upper and lower body are the same in height position. A gusset bag for forming gusset bags.   The gusset bag body for forming a gusset bag with a spout according to any one of claims 1 to 3, wherein an interval between the left and right folding materials is smaller than a width of a fixing portion of the spout to be attached.

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