JP2017088238A - Gazette bag with spout and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gazette bag body which facilitates a fastening work of a spout.SOLUTION: A gazette bag body 1 is configured so that, folding materials 3, 3 which are folded in half to have a prescribed width, are sandwiched in lateral both sides of front and back rectangular trunk materials 2a, 2b which are two trunk materials. Side seal parts 5, 5 are provided on lateral both end edges, and in addition to the side seal parts 5, 5, auxiliary seal parts 8, 8 having a width wider than that of the side seal parts 5, 5 are provided so as to protrude toward a center from lateral both ends, on lateral both sides of an opening part 9.SELECTED DRAWING: Figure 2

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 with a spout 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. An object of the present invention is to provide a method for producing a spouted gusset bag capable of efficiently producing a gusset bag which is not to be produced. Moreover, the objective of this invention is providing the gusset bag body which can perform the fixation operation | work of a spout easily at the time of manufacture of the gusset bag with a spout. In the following description, the bag before the spout is fixed is referred to as a “gusset bag body”, and the bag after the spout is fixed is referred to as a “spouted gusset bag”.

  Of the present invention, the invention described in claim 1 is formed in a bag shape having gussets on both the left and right sides by a synthetic resin sheet, and an opening for inserting a synthetic resin spout is formed on the head. It is a gusset bag body provided at a substantially center, and side seal portions are provided at the edges of the left and right ends, and on the left and right sides of the opening, separately from the side seal portions, The auxiliary seal portion wider than the side seal portion is provided so as to protrude from the left and right end portions toward the center. In the present invention, the “width” means the left and right lengths (lateral lengths) of the gusset bag body or spouted gusset bag unless otherwise specified. It is written as “height”.

  In the invention described in claim 2, in the invention described in claim 1, the right and left gussets are sandwiched between the front and back sheets and the side sheets folded in half, and these side sheets A through hole is formed at the upper edge of the auxiliary seal portion, and the auxiliary seal portion is formed so as to cover the through hole.

  The invention described in claim 3 is formed of a synthetic resin sheet, and the spout made of synthetic resin is welded in a state of being sandwiched between two sheets of the front and back at the approximate center of the edge of the head. It is a gusset bag with a spout, and auxiliary seal portions are provided on both left and right sides of the spout so as to protrude from the left and right ends toward the center, and at least a part of each of the auxiliary seal portions The spout is fused to the two front and back sheets by applying heat seal so as to overlap with each other.

The invention described in claim 4 is a method of manufacturing a gusset bag body formed of a synthetic resin sheet and having an opening for inserting a synthetic resin spout at substantially the center of the head. And the following steps (a) to (c).
(A) A long sheet laminate having a shape in which a folded sheet is sandwiched between the left and right ends of the two sheets of the front and back sheets is formed, and the left and right ends of the long sheet laminate are formed. Side sealing step for forming a side sealing portion by heat sealing (b) Auxiliary sealing step for forming an auxiliary sealing portion wider than the side sealing portion so as to protrude from the left and right ends to the center. (C) A cutting step of cutting the sheet laminate so that the auxiliary seal portion is located at the head.

  In the invention described in claim 5, strip-like heat sealing is performed at equal intervals along the direction orthogonal to the longitudinal direction on the long sheet laminate in which the side sealing portion is formed in the side sealing step. A bottom sealing step for forming a bottom seal portion, and the auxiliary sealing step forms the auxiliary sealing portion at a position adjacent to the bottom sealing portion, and the cutting step includes The sheet laminate is cut between the bottom seal portion and the auxiliary seal portion.

  The gusset bag according to claim 1 is provided with auxiliary seal portions wider than the side seal portions on both the left and right sides of the opening portion of the head, and the opening degree of the opening portion is predetermined by the auxiliary seal portion. Therefore, it is easy to position the spout when the spout is inserted into the opening and fixed (fused).

  In the gusset bag according to claim 2, the front and back sheets (so-called body) are directly spotted through the through holes of the side sheets (so-called folding material) at the upper ends of the right and left gusset portions. Since it is fused (heat sealed) and the auxiliary seal portion is formed so as to cover the spot fused portion, the fusion strength of the spot fused portion is high, and the upper end portion of the gusset is difficult to open. Therefore, according to the gusset bag of the second aspect, the spout can be fixed (fused) more easily.

  The gusset bag with a spout according to claim 3 is easy to position the spout when the spout is inserted and fixed (fused) inside the opening at the time of manufacture. Can do.

  According to the method for producing a spouted gusseted bag according to claim 4, the spout has a high fusion strength at the fixed (fused) portion, and there is no need to worry about the contents leaking even when pressure is applied. High spouted gusset bags can be produced efficiently with high yield.

  According to the method for manufacturing a gusset bag with a spout according to claim 5, since the bottom seal portion and the auxiliary seal portion can be formed at the same time, the fusion strength of the adhering portion of the spout is high and the spout is highly reliable. The gusset bag can be produced inexpensively and very efficiently.

It is explanatory drawing which shows the manufacturing method of a gusset bag body. 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 surface figure in FIG. 2, b is an BB line end surface figure in FIG. 2). It is explanatory drawing which shows a part of gusset bag (a is an enlarged view of the upper left part, and b is the CC line end view in a). 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 a gusset bag with a spout. It is explanatory drawing (front view) which shows the example of a change of the gusset bag with a spout. It is explanatory drawing (lower front view) which shows the example of a change of a gusset bag body.

  Hereinafter, an embodiment of a gusset bag with a spout according to the present invention and a manufacturing method thereof will be described in detail. 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's it. 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 on 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.

The gusset bag according to the present invention is formed by laminating the above-described synthetic resin sheet in a predetermined manner by a production method including the following steps (a) to (c), and at least a side portion of the laminate, and It is formed by heat-sealing a part of the upper part (head) and cutting it into a predetermined shape and size.
(A) A long sheet laminate having a shape in which a folded sheet is sandwiched between the left and right ends of the two sheets of the front and back sheets is formed, and the left and right ends of the long sheet laminate are formed. Side sealing step for forming a side sealing portion by heat sealing (b) Auxiliary sealing step for forming an auxiliary sealing portion wider than the side sealing portion so as to protrude from the left and right ends to the center. (C) A cutting step of cutting the sheet laminate so that the auxiliary seal portion is located at the head.

  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.

  Furthermore, in the gusset bag according to the present invention, on both the left and right sides of the opening, separately from the side seal portions, auxiliary seal portions wider than the side seal portions protrude from the left and right end portions toward the center. It is characterized by being provided. The width | variety of the said auxiliary | assistant seal | sticker part is not specifically limited, It can change suitably according to the magnitude | size etc. of a gusset. If the width of the auxiliary seal portion is 1-5 mm shorter than the width of the gusset, when the spout is fixed (fused) to the opening, the opening widens and the spout can be easily inserted, and the spout is easily fixed. Therefore, it is preferable that the difference between the width of the auxiliary seal portion and the width of the gusset is 2 to 3 mm. The height of the auxiliary seal portion is also not particularly limited, and can be appropriately changed according to the height of the spout adhesive portion (portion to be fused with the body).

  On the other hand, the spouted gusset bag according to the present invention is manufactured by fixing (fusing) a spout formed of synthetic resin inside the opening of the gusset bag body formed as described above. Such a spout can be suitably made of a hard synthetic resin or the like, and a spout member (a member in which an adhesive portion is connected to the lower portion of the spout portion) and a cap are separately molded 2 It may be a piece type or a one piece type in which the spout member and the cap are integrally formed through a thin portion. The material of the spout member must be capable of being thermally bonded (fused) with the heat-adhesive film of the gusset bag. Examples of such a material include polypropylene, linear low density polyethylene, medium density polyethylene, and high density polyethylene. Examples thereof include polyethylene and polyester.

  Moreover, the gusset bag body (the gusset bag before the spout is fixed) of the present invention may be heat-sealed at the bottom (bottom) or may not be heat-sealed. That is, when manufacturing the spouted gusset bag body of the present invention, a manufacturing method is adopted in which the spout is fixed (fused) to the opening of the head portion of the gusset bag body heat-sealed at the side and bottom (bottom). It is also possible to fix the spout to the opening of the head part of the gusset bag body in which only the side part (or part of the side part and the lower part) is heat-sealed, and then heat-seal it. It is also possible to adopt a manufacturing method in which the content is filled from the lower part (or part of the lower part), and then the unheat-sealed part of the lower part is heat-sealed and sealed.

  In addition, before manufacturing the spout, when manufacturing a gusset bag body in which the side portion and the lower portion (bottom portion) are heat-sealed, it is possible to simultaneously perform the bottom sealing step and the auxiliary sealing step, Although it is possible to carry out separately, if the bottom sealing step and the auxiliary sealing step are carried out simultaneously, the number of steps is reduced, and as a result, the spouted gusset bag can be manufactured at low cost. Furthermore, when manufacturing the gusset bag body in which the side and the lower part (bottom part) are heat-sealed, an auxiliary seal part is formed at a position adjacent to the bottom seal part, and between the bottom seal part and the auxiliary seal part. Cutting the sheet laminate is preferable because the loss (waste material) of the synthetic resin film is reduced, and as a result, the spouted gusset bag can be manufactured at low cost.

  Each heat seal (side seal, bottom seal, auxiliary seal, etc.) and cutting can be carried out as a series of processing using a gusset bag making machine, or as a batch (non-series) processing. It is also possible to implement. 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.

<Gazette bag manufacturing method>
Hereinafter, one production example of the spouted gusset bag of the present invention will be described. Fig. 1 shows how a gusset bag body is manufactured. When manufacturing a gusset bag body, first, the above-described synthetic resin sheet (long) is mounted on a gusset bag making machine. To do. That is, a pair of synthetic resin sheets (body 2a, 2b) forming the front and back of the gusset bag body are mounted with the polyethylene film (thermoadhesive film) layers inside each other, and the pair of synthetic sheets Between the left and right ends of the resin sheet, the same synthetic resin sheet (folding materials 3 and 3) for forming gussets, with the polyethylene film (thermal adhesive film) layer side facing outward Fold it in two and insert it (see FIG. 1 (a)). As described above, when the synthetic resin sheet is attached to the gusset bag making machine, the substantially circular through holes 4, 4,... Are formed in the folding members 3, 3 at predetermined intervals.

  Then, the side seals are performed by continuously performing heat sealing at a predetermined temperature (about 170 ± 5 ° C.) at the left and right ends of the body members 2a and 2b and the folding members 3 and 3 thus mounted. Form parts 5, 5... (Side sealing step). Such heat sealing (that is, side sealing) is performed so that wide portions W, W,... Are formed at predetermined intervals. Further, the wide portions W, W,... Are formed at positions where they overlap with the through holes 4, 4,. Further, the wide portions W, W,... Of the side seal portions 5, 5,... Have an air vent (non-fused portion) 6 so that the synthetic resin sheet is not distorted by thermal expansion during heat sealing. , 6 are formed so as to overlap the through hole 5 (see FIG. 1B).

  Further, the laminated body of synthetic resin sheets formed with the side seal portions 5, 5,... As described above was heated to a predetermined temperature (about 210 ± 5 ° C.) along the direction perpendicular to the longitudinal direction. By pressing the wide hot plate P, the bottom seal portion 7 and the auxiliary seal portions 8 and 8 are simultaneously formed (bottom seal step, auxiliary seal step). That is, the heat plate P has a shape in which the left and right ends of the belt-like portion with a constant width protrude downward in a plan view, and the bottom seal portion 7 is formed by the belt-like portion with the constant width, The auxiliary seal portions 8, 8 are formed by the protruding portion toward the side. In addition, the bottom seal part 7 and the auxiliary seal parts 8 and 8 are formed so that it may overlap with the through-holes 4 and 4 (refer FIG.1 (c)).

  And, in the position where the formation part of the bottom seal part 7 and the formation part of the auxiliary seal parts 8 and 8 are joined, the laminated body of the synthetic resin sheet in which the bottom seal part 7 and the auxiliary seal parts 8 and 8 are formed. By cutting using a predetermined cutter, the gusset bag bodies 1, 1,... Can be obtained (cutting step: see FIG. 1 (d)).

<Configuration of gusset bag>
2 to 4 show the gusset bag formed as described above. The gusset bag 1 is laminated on a 15 μm thick nylon film (base film) with a 12 μm thick polyester film (intermediate layer) subjected to aluminum vapor deposition so that the aluminum vapor deposition surface is bonded to the nylon film. Furthermore, it is formed by a synthetic resin sheet formed by laminating a linear low density polyethylene film (thermoadhesive film) having a thickness of 130 μm thereon, and has a size of length × width = 244 mm × 146 mm. doing.

  Further, the folding members 3 and 3 are folded in two with a predetermined width (about 42 mm width) at the edges of the left and right ends of the two substantially rectangular body members 2a and 2b of the front and back sides of the gusset bag body 1, respectively. It is caught in the state. The front and back body materials 2a and 2b are arranged with the linear low density polyethylene film (thermoadhesive film) layer inside, and the folding materials 3 and 3 are linear low density. It arrange | positions in the state which made the polyethylene film layer the back surface side of the body materials 2a and 2b of front and back. And the side seal part 5,5 ... is provided on the laminated part of the trunk | drum 2a, 2b and the folding materials 3 and 3 of the gusset bag body 1, The said side seal part 5,5 is provided. In FIG. 4, the back surface of the front side body material 2a and the back surface of the folding material 3 and the back surface of the back side body material 2b and the back surface of the folding material 3 are fused together.

Further, the side seal portions 5, 5,... Have a band shape with a constant width (about 7 mm), and the portions near the upper end and the lower end gradually become wider. The maximum width of the portion _{W 1} when the upper end, the maximum width portion _{W 2} when the lower end, respectively, of about 32 mm, about 42mm, is more portions _{W 2} when the lower end has become wider. Further, air vents 6 and 6 are provided in the wide portions W ₁ and W ₂ near the upper and lower edges of the side seal portions 5, 5.

On the other hand, 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 has a wide width at the lower end of the side seal portions 5, 5. The portions W ₂ and W ₂ overlap each other. And in the central part of the bottom seal part 7 (the part other than the side seal parts 5, 5,...), The back side of the front side body material 2a and the back side of the back side body material 2b are fused together. It is in a state.

An opening 9 is provided at the center of the upper edge of the gusset bag body 1. On both the left and right sides of the opening 9, auxiliary seal portions 8 and 8 having a constant width (up and down about 10 mm) are provided so as to protrude from the left and right ends to the center, in the state positioned on the inner side of the portion W ₁ when the upper end of the lateral seal portions 5,5 .... Then, by their auxiliary seal portions 8, in the side seal section _{5,5 ·· (W 1, W 1} ··) than the inner portion of the case upper edge of the gusset bag body 1, the front side of the body member 2a The back surface of the foldable material 3 and the back surface of the body material 2b on the back side and the back surface of the foldable material 3 are fused together.

  Further, spot welded portions 10, 10,... Are formed on the left and right end portions (gusset portion) of the bottom seal portion 7 and the left and right end portions (gusset portions) of the auxiliary seal portions 8 and 8, respectively. Is provided. As shown in FIG. 4, in the spot fused portions 10, 10..., A through hole 4 is provided so as to pass through the folded material 3 that is folded in half. The back surface of 2a and the back surface of the body 2b on the back side are directly fused together.

<Manufacturing method of gusset bag with spout>
By attaching a spout to the opening 9 at the upper end of the gusset bag body 1 formed as described above, a spout-attached gusset bag can be formed. FIG. 5 shows a spout. The spout 11 is a so-called two-piece type in which the spout member 12 and the cap 13 are separately formed, and both the spout member 12 and the cap 13 are made of polyethylene. The spout member 12 has a four-layer structure adhesive portion 15 that is continuous with a substantially rhombic horizontal section for fusing with a gusset bag body at a lower portion of a spout portion 14 for extracting contents. 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 P provided with a concave curved surface heated to a predetermined temperature (about 210 ± 5 ° C.) is pressed onto the body materials 2a and 2b located outside the bonding portion 15 to bond the spout 11 A spouted gusset bag can be obtained by fusing (heat-sealing) the portion 15 and the back surfaces of the body members 2a and 2b. FIG. 5 shows a gusset bag with a spout. In the gusset bag body 21 with a spout, a fusion portion M between the adhesive portion 15 of the spout 11 and the back surface of the body materials 2a and 2b and the auxiliary seal portion 8, 8 is in an overlapping state.

  According to the above-described method for producing a spout-attached gusset bag, the spout 11 has a high fusion strength at the fixing (fusing) portion M, and a highly reliable spout that does not have to worry about the contents leaking even when pressure is applied. The attached gusset bag 1 can be efficiently produced with a high yield.

<Effects of gusset bag and gusset bag with spout>
The above-described gusset bag body 1 is provided with side seal portions 5, 5,... At the edges of the left and right ends, and the side seal portions 5, 5,. Separately, side seal portions 5, 5,..., Wider auxiliary seal portions 8, 8 are provided so as to protrude from the left and right ends toward the center, and by the auxiliary seal portions 8, 8, Since the opening degree of the opening 9 is limited to a predetermined size, the spout 11 can be easily positioned when the spout 11 is inserted into the opening 9 and fixed (fused).

  Further, the gusset bag body 1 has the body materials 2a and 2b which are front and back sheets directly through the through holes 4 and 4 of the folding materials 3 and 3 which are side sheets at the upper ends of the right and left gusset portions. Since the auxiliary seal portions 8 and 8 are formed so as to cover the spot fusion portions 10 and 10, the fusion strength of the spot fusion portions 10 and 10 is increased. High, hard to open the upper edge of the gusset. Therefore, according to the gusset bag body 1, the spout 11 can be fixed (fused) more easily.

  Furthermore, since the spout 11 is easily positioned when the spout 11 is inserted and fixed (fused) into the opening 9 at the time of manufacture, the spout-equipped gusset bag body 21 is manufactured in a short time with good yield and low cost. be able to.

<Modification example of gusset bag and its manufacturing method>
The configuration of the gusset bag body and spouted gusset bag according to the present invention is not limited to the above-described embodiments, and the material and size of the synthetic resin film (height, width, gusset width) Etc.), the configuration of the auxiliary seal portion, the bottom seal portion, the side seal portion, and the like 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 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 embodiment, but other materials. A laminate of the above synthetic resin films may be used. In addition, as a synthetic resin sheet, when using a laminate of a nylon film, a polyester film and a polyethylene film (linear low density polyethylene film), the strength of the gusset bag becomes good, Manufacture of a gusset bag becomes easy.

  Further, the gusset bag body and spouted gusset bag according to the present invention are not limited to those having the width (left-right width) of the auxiliary seal portion shorter than the width of the gusset as in the above-described embodiment. It is also possible to change the width of the seal portion (left and right width) to be longer than the width of the gusset. When a spout having a small width (less than approximately twice the diameter of the extraction portion) is fixed (fused) to the opening, the width of the auxiliary seal portion is made longer than the width of the gusset. If the width of the opening is reduced, the spout can be easily positioned.

  Further, the structure of the method for manufacturing the gusset bag according to the present invention is not limited to the above-described embodiments, and the contents of the side sealing step, the bottom sealing step, the auxiliary sealing step, the cutting step, etc. Can be appropriately changed as necessary without departing from the spirit of the present invention. For example, the method for manufacturing the gusset bag according to the present invention is not limited to the method of forming the bottom seal portion and the auxiliary seal portion at the same time as in the above embodiment, and the auxiliary seal portion is formed after the bottom seal portion is formed. It is also possible to change to those that form the bottom seal portion after the auxiliary seal portion is formed.

  Furthermore, in the production of the gusset bag according to the present invention, the method for forming “a long sheet laminate having a shape in which a folded sheet is sandwiched between the left and right ends of the two sheets of the front and back sheets” is described above. As in the embodiment, a method in which two long sheets are overlapped in a state in which a long sheet folded in half is sandwiched between the left and right ends of the two sheets (that is, four long sheets) Is not limited to a method of forming a sheet laminate by a method of folding a single long sheet into a W-shape at one end edge and the vicinity of the center (that is, a sheet by a single long sheet). A method of forming a laminate) and a method of sandwiching a folded sheet between the edges of the long sheet with the central portion bent into a W shape (that is, two long sheets) Sheet laminate by sheet It is also possible to change the forming methods) and the like.

  Further, the manufacturing method of the gusset bag according to the present invention is not limited to the one in which the temperature of the auxiliary seal is higher than the temperature of the side seal as in the above embodiment, and the temperature of the auxiliary seal and the temperature of the side seal are Can be changed, or the temperature of the side seal can be changed to be higher than the temperature of the auxiliary seal. In addition, when the temperature of an auxiliary seal is made higher than the temperature of a side seal like the said embodiment, there exists a merit that the bag breaking resistance of a gusset bag body will become very favorable. In addition, the manufacturing method of the gusset bag according to the present invention is not limited to the one in which the side seal and the bottom seal (auxiliary seal) are performed at a time as in the above embodiment, but the side seal and the bottom seal ( It is also possible to change the auxiliary seal) to one that is performed in a plurality of times.

  Moreover, the manufacturing method of the gusset bag which concerns on this invention is the manufacturing which adheres a spout to the opening part of the head of the gusset bag which heat-sealed the side part and the lower part (bottom part) like the said embodiment. It is not limited to the method, and the lower part (open heat-sealed state) opened after the spout is fixed (fused) to the opening part of the head part of the gusset bag body 1 ′ whose side part is heat-sealed as shown in FIG. It is also possible to employ a manufacturing method in which after the contents are filled, the lower unheat-sealed portion is heat-sealed. According to such a manufacturing method, it is possible to easily fill contents that are difficult to fill from a spout such as high-viscosity contents. It is also possible to use a one-piece spout.

  Since the gusset bag body and spouted gusset bag of the present invention have excellent effects as described above, they are suitably used as packaging bags for various liquids and powders such as foods, medicines, cosmetics, and detergents. be able to. The method for producing a gusset bag according to the present invention can be widely used as a method for producing a gusset bag suitable for packaging bags of various liquids and powders at low cost and with high yield.

1,1 '・ ・ Gazette bag body 2a, 2b ・ ・ Body
3. Folding material
4. Through hole
5. Side seal portion 7. Bottom seal portion 8. Auxiliary seal portion 9. Opening portion 10. Spot fusion portion 11. Spout 21. Spouted gusset bag

Claims (5)

It is formed in a bag shape having gussets on both the left and right sides by a synthetic resin sheet, and is a gusset bag body provided with an opening for inserting a synthetic resin spout at the approximate center of the head,
Side seals are provided at the edges of the left and right ends,
Aside from the side seal portions, auxiliary seal portions wider than the side seal portions are provided on both the left and right sides of the opening so as to protrude from the left and right ends to the center. A gusset bag characterized by. The gussets on the left and right sides are sandwiched between the front and back sheets, and the side sheets folded in half, and through holes are formed near the upper edges of these side sheets,
The gusset bag according to claim 1, wherein the auxiliary seal portion is formed so as to cover the through holes. A spout made of synthetic resin, a spout made of synthetic resin is a gusset bag with a spout welded in a state where it is sandwiched between two sheets of front and back sheets at the approximate center of the edge of the head,
Auxiliary seal portions are provided on both the left and right sides of the spout so as to protrude from the left and right ends to the center, and
A spout-attached gusset bag, wherein the spout is fused to two sheets of front and back by applying heat seal so as to overlap at least a part of each of the auxiliary seal portions. It is formed by a synthetic resin sheet, and is a method for producing a gusset bag body in which an opening for inserting a synthetic resin spout is provided in the approximate center of the head,
The manufacturing method of the gusset bag body which has the process of following (a)-(c).
(A) A long sheet laminate having a shape in which a folded sheet is sandwiched between the left and right ends of the two sheets of the front and back sheets is formed, and the left and right ends of the long sheet laminate are formed. Side sealing step for forming a side sealing portion by heat sealing (b) Auxiliary sealing step for forming an auxiliary sealing portion wider than the side sealing portion so as to protrude from the left and right ends to the center. (C) A cutting step of cutting the sheet laminate so that the auxiliary seal portion is located at the head. A bottom seal that forms a bottom seal portion by performing strip-shaped heat sealing at equal intervals along a direction orthogonal to the longitudinal direction on a long sheet laminate in which a side seal portion is formed in a side seal step Has a process,
The auxiliary seal step forms the auxiliary seal portion at a position adjacent to the bottom seal portion; and
The method for producing a gusset bag according to claim 4, wherein the cutting step is to cut the sheet laminate between the bottom seal portion and the auxiliary seal portion.

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