JP6675273B2 - Method for manufacturing gusset bag and multi-row tubular body - Google Patents

Description

  The present invention relates to a method for manufacturing a gusset bag and a multi-row cylindrical body.

  As packaging bags for liquid or semi-liquid contents such as jelly drinks, gusset bags having a gusset on the side and standing bags having a gusset on the bottom are used. These packaging bags are devised to ensure independence. In particular, in the case of packaging bags for jelly drinks and the like, gusset bags that can be easily self-sustained by the weight of the contents and that can easily push out the contents by squeezing with hands are widely used.

  The gusset bag includes a pair of first and second flat portions facing each other, and a pair of first and second side portions arranged to be folded inward from the side edges thereof. I have. On the other hand, in order to manufacture bags such as gusset bags, a method of heat-sealing a film material by a bag making machine is used, and high productivity is required. In order to manufacture such a gusset bag inexpensively using a bag making machine from a long film material, if the conveying speed of the film material is increased for the purpose of increasing productivity, the heat sealing time is shortened, and the sealing is performed. There is a limit to the transport speed because defects are likely to occur. Therefore, a method of producing a plurality of rows of a long film material in the short direction is adopted. For example, when manufacturing gusset bags in three rows in the short direction of a long film material, the following method is used. As shown in FIG. 7, a pair of first side surface portions and a second side surface portion are formed between two long film materials 201 and 202 forming a pair of first flat surface portions and second flat surface portions. , Six long and half-folded film members 203 along the longitudinal direction are arranged and transported. At this time, the six film materials 203, 203,... Are arranged so that the folded portions 203a are abutted in pairs. Are heat-sealed to the film materials 201 and 202, respectively, to form three rows of cylindrical bodies. Cut in the longitudinal direction to divide each tubular body, cut further along the shorter direction with a gap in the longitudinal direction, and heat seal the lower and upper parts of these cut pieces to form a gusset bag (For example, Patent Document 1).

  However, in such a manufacturing method, it is necessary to control the conveyance of a large number of film materials for forming each of the first plane portion, the second plane portion, the first side surface portion, and the second side surface portion. As the number of film materials used increases, the control of each film material becomes more complicated. In addition, although the exchange of the film roll occurs in each of the film materials, the exchange positions do not always coincide with each other, and the displacement increases, thereby increasing the loss. Further, in the previous stage, the number of steps of slitting each film material to a required width also increases.

  Also, a method of manufacturing a plurality of gusset bags by folding and transporting one film material so that a plurality of cylindrical bodies are formed in parallel has been proposed for the purpose of reducing the number of replacements of the film roll. (Patent Document 2). However, since the width of one film material is limited by one film material, and the number of rows of cylindrical bodies that can be formed at one time cannot be so large, the productivity is low.

As the gusset bag, for example, the first side portion, the first flat portion, and the second side portion are formed of one film material, and the second flat portion is formed of another one film material. A film formed of two film materials is also known (Patent Document 3).
As a method for producing such a gusset bag, for example, the following method is exemplified. As shown in FIG. 8, a plurality of bent portions 303 forming a first plane portion, a first side surface portion, and a second side surface portion are formed along a longitudinal direction on a long first film material 301. In such a folded state, the sheet is transported together with the long second film material 302 forming the second plane portion. Next, the portion between the adjacent bent portions 303 of the first film material 301 and the second film material 302 are heat-sealed along the longitudinal direction. Further, both side end portions of the first film material 301 are heat-sealed with the second film material along the longitudinal direction to form three rows of cylindrical bodies in parallel. This is cut in the longitudinal direction to divide each tubular body, and further cut along the short direction with an interval in the longitudinal direction, and heat-sealed the lower and upper parts of these cut pieces to form a gusset bag. And

  In such a manufacturing method, since the maximum width which is the width of the film material that can be used before being folded usually depends on the width of the bag making machine, the first side portion, the first flat portion and the second side portion are formed. There is a limit to the width of the film material to be used. Therefore, in the method of Patent Document 3, the number of rows of cylindrical bodies formed at one time is limited. If the transport speed of the film material is increased in order to increase the productivity, sealing failure and the like are likely to occur. For these reasons, it is difficult to increase the productivity by the method of Patent Document 3.

JP-A-10-264943 JP-A-11-268152 JP 2011-148549 A

  An object of the present invention is to provide a method for manufacturing a gusset bag in which a film material to be conveyed is easily controlled and a gusset bag can be manufactured with high productivity, and a multi-row tubular body for gusset bag manufacturing. I do.

The present invention provides a method for manufacturing a gusset bag having the following configuration.
[1] A pair of opposing first and second flat portions, and a pair of first side portions disposed to be folded into the inside from respective side edges of the first and second flat portions. And a second side portion,
The first side surface portion, the first flat surface portion, and the second side surface portion are integrally formed, and the first side surface portion and the second side surface portion have respective side edges on the second flat surface portion side; A method for continuously manufacturing a gusset bag in which two side edge seal portions are formed with both side edges of a second flat portion,
A method for producing a gusset bag having the following steps (1) to (4).
Step (1): A pair of long first film materials and second film materials are conveyed in a state of being folded so that the film materials satisfy the following condition (i).
<Condition (i)>
A bent portion forming the first plane portion, the first side portion, and the second side portion is included in both the first film material and the second film material, and the bent portions are short sides of the film material. A plurality are formed in parallel so that the positions are shifted in the direction.
Step (2): forming a joining portion in which a portion corresponding to the side edge seal portion in the first film material and the second film material is joined in a longitudinal direction, the first flat portion, the second flat portion, A multi-row tubular body in which a plurality of tubular bodies each having the first side surface portion and the second side surface portion are connected in a short direction is obtained.
Step (3): a joining portion of the multi-row cylindrical body is cut in a longitudinal direction to form two side edge seal portions, and the first plane portion, the second plane portion, and the first side surface portion And obtaining a cylindrical body having the second side surface.
Step (4): a step of joining and cutting the tubular body along the transverse direction to obtain a plurality of gusset bags.
[2] The method for manufacturing a gusset bag according to [1], wherein the multi-row cylindrical body is symmetrical with respect to the center in the short direction.
[3] The method for manufacturing a gusset bag according to [1] or [2], wherein the bent portions of the first film material and the second film material are alternately formed in parallel in the short direction.
[4] A pair of opposing first and second flat portions, and a pair of first side portions arranged to be folded into the inside from respective side edges of the first and second flat portions. And a second side portion,
The first side surface portion, the first flat surface portion, and the second side surface portion are integrally formed, and the first side surface portion and the second side surface portion have respective side edges on the second flat surface portion side; A multi-row cylindrical body for manufacturing a gusset bag in which two side edge seal portions are formed with both side edges of the second flat portion,
Formed of a pair of long first film material and second film material,
A plurality of cylindrical bodies each including a bent portion serving as the first flat portion, the first side portion, and the second side portion, and a flat portion forming the second flat portion are formed in parallel in a short direction. And
A multi-row tubular body, wherein the bent portion is included in both the first film material and the second film material.

ADVANTAGE OF THE INVENTION According to the manufacturing method of the gusset bag of this invention, control of the film material to be conveyed is easy, and a gusset bag can be manufactured with high productivity.
By using the multi-row cylindrical body of the present invention, it is easy to control the film material at the time of manufacturing, and it is possible to manufacture gusset bags with high productivity.

It is a front view of the gusset bag manufactured by the manufacturing method of the gusset bag of the present invention. It is a rear view of the gusset bag manufactured by the manufacturing method of the gusset bag of this invention. It is I-I 'sectional drawing of the gusset bag of FIG. It is the perspective view which showed one process of the manufacturing method of the gusset bag of this invention. It is sectional drawing which showed one process of the manufacturing method of the gusset bag of this invention. It is the perspective view which showed one process of the manufacturing method of the gusset bag of this invention. It is the perspective view which showed one process of the manufacturing method of the conventional gusset bag. It is the perspective view which showed one process of the manufacturing method of the conventional gusset bag.

[Production method of gusset bag]
The gusset bag manufactured by the manufacturing method of the present invention is configured such that the gusset bag is folded inside from a pair of opposing first and second flat portions and side edges of the first and second flat portions. It has a pair of first and second side portions arranged. Further, in the gusset bag, the first side surface portion, the first flat surface portion, and the second side surface portion are integrally formed, and the first side surface portion and the second side surface portion have respective side edges on the second flat surface side. , Two side edge seal portions joined to both side edges of the second flat portion.

  The gusset bag manufactured by the manufacturing method of the present invention may be provided with a mouth member for discharging contents, or may not be provided with the mouth member. Hereinafter, an example of the gusset bag manufactured by the manufacturing method of the present invention will be described.

(Gazette bag)
As shown in FIG. 1, the gusset bag 1 with a mouth member of the present embodiment includes a gusset bag 10 and a mouth member 20 attached to the upper portion of the gusset bag 10 in a liquid-tight manner. As shown in FIGS. 1 to 3, the gusset bag 10 connects a pair of opposing first plane portions 11 and second plane portions 12 to side edges of the first plane portions 11 and the second plane portions 12. It comprises a pair of opposing first and second side portions 13 and 14.

  The first plane portion 11 and the pair of first side surface portion 13 and second side surface portion 14 are integrally formed of one first film material 2. In other words, the gusset bag 10 of this example includes the first film material 2 forming the first plane portion 11, the first side surface portion 13 and the second side surface portion 14, and the second film material 3 forming the second plane portion 12. And two film materials.

  The first side surface portion 13 is provided so that the folding line 13a is on the inside, that is, is folded from one side edge of the first flat portion 11 and the second flat portion 12 to the inside. Similarly, the second side surface portion 14 is provided so that the folding line 14a is on the inside, that is, the second side surface portion 14 is folded inward from the other side edge of the first plane portion 11 and the second plane portion 12.

In the gusset bag 10, both side edges of the second plane portion 12 formed by the second film material 3 and the first side surface portion 13 and the second side surface portion 14 formed by the first film material 2, respectively. Are formed, for example, by heat sealing. In addition, upper contacting inner surfaces of the first flat portion 11, the second flat portion 12, the first side surface portion 13, and the second side surface portion 14 are joined by heat sealing to form an upper seal portion 16. Further, the lower contacting inner surfaces of the first plane portion 11, the second plane portion 12, the first side surface portion 13, and the second side surface portion 14 are also joined by heat sealing to form a lower seal portion 17. As a result, the gusset bag 1 with a mouth member can accommodate the contents in the gusset bag 10.
In addition, the joining of the side edge sealing portion, the upper sealing portion, and the lower sealing portion is not limited to heat sealing. For example, known joining such as impulse sealing, high frequency sealing, ultrasonic sealing, and joining with an adhesive may be used. included.

The number of the side edge seal portions 15 in the gusset bag 10 is two. Compared to a gusset bag having four side edge seal portions, there is less side edge seal portion 15 that comes into contact with the gusset bag 10 when grasped by hand, so pain is less likely to be felt. In addition, since there are two side edge seal portions, independence can be secured.
The gusset bag 1 with a mouth member may use the first flat portion 11 as a front surface and the second flat portion 12 as a back surface, or use the second flat portion 12 as a front surface and the first flat portion 11 as a back surface. Good.

  Examples of the first film material and the second film material include a single-layer film and a laminated film having a multilayer structure. As the first film material and the second film material, a laminated film is preferable in that various functions can be imparted, and an innermost layer capable of heat sealing, an intermediate layer imparted with various functions, and an outermost layer Is more preferable.

  As the film used as the innermost layer, for example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, polyolefin resin such as linear low-density polyethylene, or a resin mixture thereof, ionomer resin, ethylene-vinyl acetate copolymer And an unstretched film composed of at least one selected from the group consisting of ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, and ethylene-methacrylic acid copolymer. Alternatively, a resin composed of these may be used. The thickness of the innermost layer is preferably from 30 to 200 μm.

  As the film used as the outermost layer, a film having high mechanical suitability and high printability is preferable. For example, a film made of a synthetic resin such as polyester, polyamide, polypropylene, polycarbonate, and polyacetal can be used. These films may be unstretched films or stretched films stretched uniaxially or biaxially. As the film used as the outermost layer, it is preferable to use a stretched film stretched in a uniaxial or biaxial direction from the viewpoint of printability. Specific examples include stretched plastic films such as biaxially stretched polyethylene terephthalate, biaxially stretched polyamide, and biaxially stretched polypropylene. In addition, synthetic paper, cellophane, paper, nonwoven fabric, and the like can be used as necessary. The thickness of the outermost layer is preferably from 12 to 25 μm.

  The intermediate layer is appropriately selected according to the required functions such as gas barrier properties, mechanical toughness, bending resistance, piercing resistance, impact resistance, abrasion resistance, cold resistance, heat resistance, chemical resistance, etc. it can. As the film used for the intermediate layer, for example, aluminum, iron, copper, tin or other metal foil, polyethylene terephthalate, polyamide, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-vinyl acetate copolymer saponified film, or the like, or Films coated with polyvinylidene chloride or films on which inorganic substances such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide, and magnesium oxide are deposited, films such as polyvinylidene chloride, and have heat insulating properties Non-woven fabrics and foam films are exemplified. The intermediate layer may be a single layer or two or more layers. The thickness of the intermediate layer may be any thickness as long as the function required for the gusset bag 10 can be satisfied, and is preferably 6 to 20 μm.

In the first film material and the second film material, a vapor deposition film provided with a vapor deposition layer may be used as a film used for the outermost layer instead of providing the intermediate layer. Examples of the deposited layer include inorganic substances such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide, and magnesium oxide. These laminated films are manufactured by laminating each layer using a known method.
The first film material and the second film material may be the same or different, and are preferably the same.

  As shown in FIGS. 1 and 2, the mouth member 20 is inserted into the gusset bag 10, and a spout tube 21 for spouting out the contents. And a cap 22 for sealing the spout. The mouth member 20 is liquid-tightly attached to the upper seal portion 16 by heat sealing in a state where the pouring pipe 21 is sandwiched between the upper edges of the first flat portion 11 and the second flat portion 12.

  As a material of the mouth member 20, at least a portion of the spout tube 21 that is sealed with the inner surface of the first flat portion 11 is a synthetic resin. Examples of the synthetic resin include polyolefin resin, polyamide resin, polyester resin, (meth) acrylic resin, vinyl chloride resin, vinylidene chloride resin, polyether sulfone, and ethylene-vinyl alcohol copolymer. Among them, polyolefin resins are preferred because of their excellent workability and low cost.

  Examples of the polyolefin resin include high-density polyethylene, medium-density polyethylene, high-pressure low-density polyethylene, linear low-density polyethylene, polyethylene resins such as ethylene-vinyl acetate copolymer, and ethylene-α-olefin copolymer. Olefinic elastomer, polypropylene, ethylene-propylene random copolymer, α-olefin-propylene random copolymer, and other polypropylene-based resins, and cyclic polyolefin resins. These resins may be blended for improving performance, or may be partially cross-linked for the purpose of improving heat resistance and the like.

  The mouth member 20 may be formed of a single material, or may have a multi-layer structure including various resin layers. The resin forming the sealing portion between at least the first flat portion 11 and the second flat portion 12 of the gusset bag 10 in the outlet pipe 21 of the mouth member 20 is the most prominent of the first flat portion 11 in terms of sealing properties. The inner layer and the innermost layer of the second plane portion 12 are preferably formed of the same type of resin.

(Production method)
Hereinafter, as an example of the method for manufacturing the gusset bag of the present invention, a method for continuously manufacturing the gusset bag 1 with the mouth member described above will be described. The method for manufacturing the gusset bag 1 with a mouth member of the present embodiment includes the following steps (1) to (4).
Step (1): As shown in FIG. 4, a pair of long first film materials 2 and second film materials 3 are overlapped in a state where the film materials are folded so as to satisfy a condition (i) described later. Conveyed together.
Step (2): A portion corresponding to the side edge sealing portion 15 in the first film material 2 and the second film material 3 is heat-sealed in the longitudinal direction, and as shown in FIG. A multi-row cylindrical body 40 in which a plurality of cylindrical bodies 42 each having the portion 12, the first side surface portion 13, and the second side surface portion 14 are arranged in the short direction is obtained.
Step (3): The heat seal portion of the multi-row tubular body 40 is cut in the longitudinal direction, and two side edge seal portions 15 are formed as shown in FIG. 6, and the first flat portion 11 and the second flat portion A step of obtaining a cylindrical body 42 having the portion 12, the first side portion 13, and the second side portion 14.
Step (4): A step of obtaining a plurality of gusset bags 10 by heat-sealing and cutting the tubular body 42 along the lateral direction.
Further, the upper seal portion 16 joined by heat sealing with the mouth member 20 interposed between the first flat portion 11 and the second flat portion 12 of the gusset bag 10 to obtain the gusset bag 1 with the mouth member.

<Step (1)>
A pair of long first film materials 2 and second film materials 3 are conveyed in a state of being folded so that the film materials satisfy the condition (i).
Condition (i): The bent portions forming the first plane portion, the first side surface portion, and the second side surface portion are included in both the first film material and the second film material, and the bent portions are short sides of the film material. A plurality are formed in parallel so that the positions are shifted in the direction.

  Specifically, as shown in FIG. 4, the first film material 2 and the second film material 3 are each folded, and the first film material 2 and the second film material 3 are both folded on the first plane material 11, the first side surface 13, and the second side surface 14. Is formed so that the bent portion 31 forming the longitudinal direction extends in the longitudinal direction. At this time, a plurality of bent portions 31 formed on each of the first film material 2 and the second film material 3 are formed in parallel so as to be displaced in the lateral direction of the film material. In this example, seven bent portions 31 are formed alternately in the short direction of the first film material 2 and the second film material 3. Three of the seven bent portions 31 are formed on the first film material 2 and four are formed on the second film material 3.

  A flat portion 32 for forming the second flat portion 12 and the side edge sealing portion 15 is formed between the bent portions 31 of the first film material 2 and on the side edge side of the bent portion 31. In the short direction of the first film material 2, the plane portions 32 and the bent portions 31 are formed alternately. A flat portion 32 for forming the second flat portion 12 and the side edge seal portion 15 is also formed between the bent portions 31 in the second film material 3. In the short direction of the second film material 3, the plane portions 32 and the bent portions 31 are formed alternately.

  The position of each plane portion 32 in the short direction in the first film material 2 corresponds to the position of the bent portion 31 in the second film material 3. Similarly, the position in the short direction of each planar portion 32 in the second film material 3 corresponds to the position of the bent portion 31 in the first film material 2.

  In step (1) of this example, the middle bent portion 31 of the three formed on the first film material 2 is located at the center of the first film material 2 in the short direction, and the remaining two are short. It is arranged at a position symmetrical with respect to the center line a in the hand direction. Further, two of the four bent portions 31 formed on the second film material 3 are arranged at symmetric positions with respect to the center line a in the short direction. That is, in this example, the cross-sectional shapes perpendicular to the longitudinal direction of the first film material 2 and the second film material 3 in the step (1) are symmetric with respect to the center in the short direction. In the present invention, the cross-sectional shapes perpendicular to the longitudinal direction of the first film material and the second film material folded so as to satisfy the condition (i) are symmetric with respect to the center in the lateral direction. Is preferred. Thus, when the first film material and the second film material are transported, tension is applied to them in a well-balanced manner, and troubles are less likely to occur.

Specifically, when a long film material is transported using a nip roll or the like composed of two upper and lower rolls in a bag making machine, when there is a difference in the thickness in the short direction, a portion where the thickness of the film material is large The more the pressure from the roll is applied, the more likely it is. In the portion where the first side surface portion 13 or the second side surface portion 14 in the bent portion 31 is located, four film materials overlap, whereas in other portions, the film material overlaps two. Therefore, the pressure from the roll tends to be easily applied to the portion where the first side surface portion 13 or the second side surface portion 14 in the bent portion 31 is located during the transport. Further, in the first film material 2 and the second film material 3, the bent portion 31 is more likely to be in contact with the upper roll or the lower roll than the flat portion 32, so that pressure from the roll is likely to be applied. Therefore, the position of the first side surface portion 13 or the second side surface portion 14 of the bent portion 31 is most likely to receive pressure, and the position of only the flat portion 32 is least likely to receive pressure. Since the cross-sectional shape perpendicular to the longitudinal direction of the first film material 2 and the second film material 3 is symmetrical with respect to the center in the short direction, the portion of the film material that is likely to be subjected to pressure during conveyance is also short. It is symmetrical about the center in the hand direction. As a result, pressure is applied to the first film material and the second film material from the roll in a well-balanced manner in the short direction during conveyance, so that the first film material and the second film material are pulled in a well-balanced manner and the conveyance direction of each film material Therefore, the paper can be transported more smoothly without shifting to the right or left.
Further, since the bent portions 31 are formed alternately in the short direction of the first film material 2 and the second film material 3, a portion where the pressure from the roll is likely to be applied and a portion where the pressure is unlikely to be applied during the conveyance are reduced. They are alternately located in the short direction. Thereby, since the pressure is applied to the first film material and the second film material from the roll in a well-balanced manner, the first film material and the second film material are pulled in a well-balanced manner, so that the first film material and the second film material can be transported more smoothly.

  The form in which the first film material and the second film material are folded is not limited to the above-described form as long as the condition (i) is satisfied. For example, the bent portions formed on the first film material and the second film material may not be formed symmetrically or alternately. The number of bent portions formed on the first film material and the second film material, respectively, is not particularly limited, and considering the use efficiency of the film material in accordance with the size of the bag to be made and the width of the bag making machine, It can be set appropriately.

<Step (2)>
In the first film material 2 and the second film material 3 conveyed as in the step (1), portions corresponding to the side edge seal portions 15 are joined in the longitudinal direction to form a joined portion. Specifically, both sides of the bent portion 31 of the first film material 2 and the second film material 3 and the corresponding portion of the plane portion 32 are heat-sealed in the longitudinal direction, thereby forming a heat-sealed portion as a joint. . Thereby, as shown in FIG. 5, a multi-row cylinder in which a plurality of cylindrical bodies 42 having the first plane portion 11, the second plane portion 12, the first side surface portion 13, and the second side surface portion 14 are arranged in the short direction. The state body 40 is obtained. The joining of the portions corresponding to the side edge sealing portions 15 in the first film material 2 and the second film material 3 is not limited to heat sealing, and may be performed by, for example, impulse sealing, high-frequency sealing, ultrasonic sealing, or an adhesive. Known bonding such as bonding is also included.

  In the multi-row tubular body 40, a tubular body including a bent portion 31 serving as the first flat portion 11, the first side face portion 13 and the second side face portion 14, and a flat portion 32 forming the second flat face portion 12. 42 are formed in parallel in the lateral direction. Further, the bent portion 31 is included in both the first film material 2 and the second film material 3. In the multi-row tubular body 40 of this example, seven tubular bodies 42 are formed in the first film material 2 and the second film material 3 alternately in parallel in the short direction. In the step (1), when the cross-sectional shape perpendicular to the longitudinal direction of the first film material 2 and the second film material 3 is symmetrical with respect to the center in the short direction, the formed multi-row cylindrical body is also short. It is symmetrical about the center in the hand direction.

<Step (3)>
A heat seal portion, which is a joining portion in the multi-row tubular body 40, is cut along a straight line X shown in FIG. That is, the portion near the center in the width direction of the heat seal portion in the multi-row tubular body 40 is cut in the longitudinal direction. Thereby, as shown in FIG. 6, two side edge seal parts 15 are formed, and the cylindrical body 42 having the first plane part 11, the second plane part 12, the first side part 13, and the second side part 14 is formed. Cut out multiple.

<Step (4)>
The lower seal portion 17 is formed along the straight line Y with respect to the cylindrical body 42, that is, along the short direction at a constant interval in the longitudinal direction of the first film material 2 and the second film material 3. The inner surfaces of the first flat portion 11, the second flat portion 12, the first side surface portion 13, and the second side surface portion 14 of the portion are heat-sealed and joined to form a heat seal portion. Next, the first film material 2 and the second film material 3 are cut along the straight line Y, that is, along the short direction at a certain interval in the longitudinal direction of the first film material 2 and the second film material 3. , Divided into a plurality of pieces in the longitudinal direction. At this time, the bag is cut so that the heat-sealed portion becomes one end of the bag. As a result, a bag-shaped film material in which the lower seal portion 17 is formed below the first flat portion 11, the second flat portion 12, the first side portion 13, and the second side portion 14 is obtained.
The bonding for forming the lower seal portion is not limited to heat sealing, and includes, for example, known bonding such as impulse sealing, high-frequency sealing, ultrasonic sealing, and bonding with an adhesive.

Next, the inner surfaces of the first flat portion 11 and the second flat portion 12 are in contact with each other, and the first flat portion 11 is in contact with the first side portion 13 and the second side portion 14 at the upper portion of the bag-shaped film material divided into a plurality. The inner surfaces and the inner surfaces of the second flat surface portion 12 and the first and second side surface portions 13 and 14 that are in contact with each other are heat-sealed and joined to form an upper seal portion 16. In the heat sealing between the inner surfaces of the first flat portion 11 and the second flat portion 12, the spout tube 21 of the mouth member 20 is sandwiched between the upper edges of the first flat portion 11 and the second flat portion 12. Heat sealing is performed in this state, and the mouth member 20 is attached to the upper seal portion 16 in a liquid-tight manner. Thereby, a plurality of gusset bags 1 with mouth members are obtained.
The bonding for forming the upper seal portion is not limited to heat sealing, and includes, for example, known bonding such as impulse sealing, high-frequency sealing, ultrasonic sealing, and bonding with an adhesive.

In the method for manufacturing a gusset bag of the present invention described above, a gusset bag is manufactured using two film materials, a first film material and a second film material. Therefore, the number of film materials can be reduced as compared with the case of using the film material forming each of the first flat surface portion, the second flat surface portion, the first side surface portion, and the second side surface portion, and control of the film material to be conveyed. Is easy.
Further, in the present invention, the first film material and the second film material are superposed and transported in a folded state so as to satisfy the condition (i), and are joined along the longitudinal direction to form a plurality of cylindrical bodies. A multi-row cylindrical body for producing gusset bags formed in parallel in the short direction is obtained. That is, a bent portion for forming the first plane portion, the first side surface portion, and the second side surface portion is formed on both the first film material and the second film material. As a result, the number of tubular members in the multi-row tubular member can be increased without further increasing the maximum width of the film material, as compared with a case where the bent portion is formed only on one film material. Productivity can be increased without increasing the transport speed. In addition, the number of slits at a stage before the production can be reduced as compared with the case where a gusset bag is produced using a large number of film materials. In this way, more gusset bags can be manufactured per unit of time.

  In addition, the manufacturing method of the gusset bag of the present invention is not limited to the method described above. For example, the method for manufacturing a gusset bag of the present invention may be a method for manufacturing a gusset bag without a mouth member. Further, in the step (1), the side edges of the first film material and the second film material may be connected and integrated. Furthermore, the side edge seal portion of the gusset bag manufactured by the method for manufacturing a gusset bag of the present invention may be bent to the second flat surface portion or each side surface portion, and the bent side edge seal portion is attached to each surface portion and fixed. May be.

Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited by the following description.
[Example 1]
A gusset bag is manufactured by using the first film material and the second film material having a width of 1200 mm and performing the steps (1) to (4) of the present invention shown in FIGS. In the step (1), the width of the first plane portion and the second plane portion is 80 mm, the width from the side edge of the first side surface portion and the side edge of the first side surface portion to the folded portion is 27 mm, and the first film material and the second film material The bent portions are formed alternately. In a multi-row tubular body, eight rows of tubular bodies can be formed in parallel, and eight gusset bags can be manufactured in the transverse direction. High productivity of gusset bags.

[Comparative Example 1]
A gusset bag having the same dimensions as in Example 1 is manufactured except that a bent portion is formed only on the first film material having a width of 1200 mm and the bent portion is not formed on the second film material. The limit is to produce six gusset bags in the transverse direction, and the productivity is inferior to that of the first embodiment.

[Comparative Example 2]
If only one film material having a width of 1200 mm is folded to produce a gusset bag having the same dimensions as in Example 1, it is limited to produce four gusset bags in the transverse direction. Poor productivity.

Reference Signs List 1 gusset bag with mouth member 2 first film material 3 second film material 10 gusset bag 11 first plane portion 12 second plane portion 13 first side surface portion 14 second side surface portion 15 side edge seal portion 20 mouth member 31 bent portion 32 flat part 40 multi-row cylindrical body 42 cylindrical body

Claims (4)

A pair of opposing first and second flat portions and a pair of first side and second side portions arranged to be folded inward from respective side edges of the first and second flat portions. With a side part,
The first side surface portion, the first flat surface portion, and the second side surface portion are integrally formed, and the first side surface portion and the second side surface portion have respective side edges on the second flat surface portion side; A method for continuously manufacturing a gusset bag in which two side edge seal portions are formed with both side edges of a second flat portion,
A method for producing a gusset bag having the following steps (1) to (4).
Step (1): A pair of long first film materials and second film materials are conveyed in a state of being folded so that the film materials satisfy the following condition (i).
<Condition (i)>
A bent portion forming the first plane portion, the first side portion, and the second side portion is included in both the first film material and the second film material, and the bent portions are short sides of the film material. A plurality are formed in parallel so that the positions are shifted in the direction.
Step (2): forming a joining portion in which a portion corresponding to the side edge seal portion in the first film material and the second film material is joined in a longitudinal direction, the first flat portion, the second flat portion, A multi-row tubular body in which a plurality of tubular bodies each having the first side surface portion and the second side surface portion are connected in a short direction is obtained.
Step (3): a joining portion of the multi-row cylindrical body is cut in a longitudinal direction to form two side edge seal portions, and the first plane portion, the second plane portion, and the first side surface portion And obtaining a cylindrical body having the second side surface.
Step (4): a step of joining and cutting the tubular body along the transverse direction to obtain a plurality of gusset bags.   The method for manufacturing a gusset bag according to claim 1, wherein the multi-row tubular body is symmetrical with respect to a center in a short direction.   The method for manufacturing a gusset bag according to claim 1, wherein the bent portions of the first film material and the second film material are alternately formed in parallel in the short direction. A pair of opposing first and second flat portions and a pair of first side and second side portions arranged to be folded inward from respective side edges of the first and second flat portions. With a side part,
The first side surface portion, the first flat surface portion, and the second side surface portion are integrally formed, and the first side surface portion and the second side surface portion have respective side edges on the second flat surface portion side; A multi-row cylindrical body for manufacturing a gusset bag in which two side edge seal portions are formed with both side edges of the second flat portion,
Formed of a pair of long first film material and second film material,
A plurality of cylindrical bodies each including a bent portion serving as the first flat portion, the first side portion, and the second side portion, and a flat portion forming the second flat portion are formed in parallel in a short direction. And
A multi-row tubular body, wherein the bent portion is included in both the first film material and the second film material.

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