JP4305639B2 - Packaging bag manufacturing apparatus and manufacturing method - Google Patents

Description

  The present invention relates to a manufacturing apparatus and a manufacturing method for a packaging bag, and more particularly to a manufacturing apparatus and a manufacturing method for a one-end connected packaging bag in which one ends of a plurality of small packaging bags are connected.

  In order to facilitate inventory management of small items, handling at the time of shipment, handling at a delivery destination, etc., a continuous packaging bag (hereinafter referred to as a continuous packaging bag) as shown in FIG. 8 is known. The continuous packaging bag shown in FIG. 8 has a small article sandwiched between two films, and the two films are bonded around the small article so that each small article is separated and packaged. Is formed. Moreover, various manufacturing methods of such a continuous packaging bag are disclosed (see Patent Documents 1 and 2 below).

On the other hand, in order to display confectionery and the like in a space-saving manner, a form as shown in FIG. 9 is known in which one end of each confectionery bag 120 is attached to the holding material 100 with an adhesive portion 130. By suspending and displaying this form at the upper end portion 110 of the holding material 100, each confectionery bag 120 at any position can be removed without affecting the fixed state of the other confectionery bags 120. Become. Patent Document 3 below discloses a method for automating the manufacture of the form shown in FIG. 9 and a manufacturing apparatus therefor.
JP-A-6-31723 Utility Model Registration No. 3000792 JP-T 9-508879

  Normally, a continuous packaging bag is accommodated in a box of a predetermined size at the time of shipment of the product. However, in the continuous packaging bag shown in FIG. It is easy to occur and accommodation efficiency is bad. In addition, when packing in a box shorter than the total length of the continuous packaging bag, it is necessary to fold and pack the continuous packaging bag according to the size of the box, which makes it difficult to automate the packaging work, Packing was necessary. For example, a continuous wrapping bag (one small wrapping bag is about 80 mm in length x about 45 mm in width) that wraps seven products each having a length of about 60 mm, a width of about 20 mm, and a thickness of about 10 mm. It was 80 mm, the total length was as long as about 300 mm, and handling was not easy when folded and packed.

  Moreover, if the form shown in FIG. 9 used in the conventional confectionery is used, the accommodation efficiency is improved, but the attachment of the small packaging bag to the holding material is generally performed manually, and the production efficiency is improved. Is low. Even if the manufacturing apparatus disclosed in Patent Document 3 is used, only one small packaging bag can be bonded to the holding material in one bonding operation, and the small packaging bag containing the product during the bonding operation is held. Since it is held only by the bonding portion to the material, it is unstable and the bonding process cannot be accelerated. Accordingly, the productivity is low, and only about several tens of small packaging bags per minute can be bonded to the holding material.

  In order to solve the above-described problems, the present invention can automatically manufacture a packaging bag in which a plurality of small packaging bags are connected, which has a short overall length, is easy to handle, and can be packaged with a high accommodation rate. An object of the present invention is to provide a packaging bag manufacturing apparatus and a manufacturing method that can be applied to mass production.

  The object of the present invention is achieved by the following means.

  That is, the packaging bag manufacturing apparatus (1) according to the present invention is a packaging bag manufacturing apparatus in which one end of a plurality of small packaging bags is connected, and the adjacent distance for housing the small packaging bags is greater than the depth. A small packaging body holding means that has a plurality of short concave portions on the outer peripheral portion and rotates intermittently in a predetermined direction, and a peripheral portion of the small packaging bag that protrudes from the concave portion. A contact means for contacting and overlapping the surface of the holding member, and an adhesive means disposed on the other surface side of the holding member for generating heat, and the adhesive means when the small package body holding means stops intermittently. However, it is characterized by contacting an overlapping portion between the peripheral portion of the small packaging bag and the holding member, and heating and bonding the overlapping portion.

  Moreover, the packaging bag manufacturing apparatus (2) according to the present invention bends the peripheral portion protruding from the recess along the outer periphery of the small packaging body holding means in the packaging bag manufacturing apparatus (1). It further has a pressing means.

  The packaging bag manufacturing apparatus (3) according to the present invention is a packaging bag manufacturing apparatus in which one end of a plurality of small packaging bags is connected, and the adjacent distance for housing the small packaging bags is greater than the depth. A small package body holding means having a plurality of short concave portions on the outer peripheral portion and intermittently rotating in a predetermined direction, and a peripheral portion projecting from the concave portion longer than the adjacent distance, And a pressing means for forming an overlapping portion by folding at least a part of the peripheral part over at least a part of the peripheral part of an adjacent small packaging bag, and an adhesive means for generating heat. When the body holding means stops intermittently, the bonding means contacts the overlapping portion and heats and bonds the overlapping portion.

  Moreover, the packaging bag manufacturing apparatus (4) according to the present invention includes an input unit that inputs the small packaging bag into the concave portion in any of the packaging bag manufacturing apparatuses (1) to (3), and an adhesive. The apparatus further includes a cutting means for separating the plurality of small packaging bags by a predetermined number.

  Moreover, the packaging bag manufacturing apparatus (5) according to the present invention is such that, in any of the packaging bag manufacturing apparatuses (1) to (4), the bonding means is arranged at the same interval as the adjacent distance. Each time the small package holding means intermittently stops a number of times equal to or less than the number of the end portions after the bonding means moves, and the bonding means moves, Each of the end portions is in contact with the overlapping portion.

  Moreover, the packaging bag manufacturing apparatus (6) according to the present invention is the packaging bag manufacturing apparatus (2) to (5) described above, wherein the pressing means includes a heating means, and the superheating means The peripheral portion protruding from the recess is heated and softened.

  The packaging bag manufacturing apparatus (7) according to the present invention is the packaging bag manufacturing apparatus (1) to (6) described above, wherein the peripheral portion protruding from the recess is the small packaging bag holding means. The concave portion holds the small packaging bag so as to incline in the direction opposite to the rotation direction.

  Moreover, the manufacturing method (1) of the packaging bag according to the present invention is a manufacturing method of a packaging bag in which one end of a plurality of small packaging bags is connected, and holds the small packaging body that rotates intermittently in a predetermined direction. Means for introducing the small packaging bag into each of the plurality of recesses whose adjacent distance is shorter than the depth, and a peripheral portion of the small packaging bag protruding from the recess is provided on one of the sheet-shaped holding members. A contact step of contacting and overlapping the surface, and an adhesion step of heating and bonding the overlapping portion of the peripheral portion and the holding member when the small package body holding means stops intermittently. It is said.

  Moreover, the manufacturing method (2) of the packaging bag according to the present invention is a manufacturing method of a packaging bag in which one end of a plurality of small packaging bags is connected, and holds the small packaging body that rotates intermittently in a predetermined direction. Means for introducing the small packaging bag into each of the plurality of recesses whose adjacent distance is shorter than the depth, and a peripheral portion that protrudes from the recess longer than the interval between the adjacent small packaging bags. A pressing step for forming an overlapping portion by folding at least a part of the peripheral part of the adjacent small packaging bag by folding along the outer periphery of the packaging body holding means, and the small packaging body holding means; An adhesion step of heating and adhering the overlapping portion when intermittently stopping.

  According to the manufacturing apparatus or the manufacturing method of a packaging bag according to the present invention, it is possible to manufacture a packaging bag that is short in length, compact, and easy to handle, in which peripheral portions of a plurality of small packaging bags are connected at short intervals. it can. Therefore, it is possible to carry out boxed packaging with a high accommodation rate, and even when packaging in a relatively small box, the operation of folding the packaging bag becomes unnecessary, and the boxing operation can be performed easily and efficiently. For example, a conventional continuous wrapping bag that wraps seven products with a length of about 60 mm, a width of about 20 mm, and a thickness of about 10 mm (one small wrapping bag is about 80 mm long x about 45 mm wide) is about full length. In contrast to 300 mm, the packaging bag manufactured by the packaging bag manufacturing apparatus or manufacturing method according to the present invention has an overall length of about 150 mm (a length of about 80 mm × a width of about 45 mm of small packaging bags with an interval of about 20 mm). 7), the length is shortened to about 1/2 of the conventional one.

  Further, by arranging a recess for stably holding the small packaging bag on the outer periphery of the small packaging bag holding means and rotating the small packaging bag holding means in one direction, the apparatus itself becomes compact and at high speed. Stable bonding work is possible. According to the packaging bag manufacturing apparatus of the present invention, about 80 to 160 small packaging bags can be bonded per minute, and a packaging bag in which a predetermined number of small packaging bags are connected can be manufactured. It becomes about 2 to 3 times higher than the conventional one.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic configuration diagram illustrating a packaging bag manufacturing apparatus according to an embodiment of the present invention, in which (a) is a front view, (b) is a plan view, and (c) is a right side view. The packaging bag manufacturing apparatus 1 according to the present embodiment includes an input conveyor 2 for inputting the small packaging bag 20 into the packaging bag manufacturing apparatus 1, and a first extrusion means 3 for extruding the small packaging bag 20 from the input conveyor 2. The rotary disk 4 having a predetermined depth for holding the extruded small packaging bag 20, the press plate 5 for bending the protruding portion of the held small packaging bag, the first to third rollers 6 to 8, and the small packaging Heat bonding means 9 for bonding the bag 20, a perforation cutter 10 for forming a perforation, a cutting cutter 11 for separating the bonded small packaging bag 20 every predetermined number, and a small packaging separated for every predetermined number Second extruding means 12 for extruding the bag 20 from the turntable 4, film supply means 13 for supplying a film sheet to which the small packaging bag 20 is bonded, intermittent drive means for intermittently rotating and stopping the turntable 4 (FIG. (Not shown) To have. In FIG. 1, they are appended so that the approximate positions of the carry-in conveyor 14 and the carry-out conveyor 15 arranged adjacent to the packaging bag manufacturing apparatus 1 can be understood. A small packaging bag 20 as shown in FIG. 2 is formed by a small packaging bag manufacturing apparatus (not shown) different from the packaging bag manufacturing apparatus 1, and is supplied to the packaging bag manufacturing apparatus 1 by the carry-in conveyor 14. The small packaging bag 20 shown in FIG. 2 is formed by sandwiching the product 30 between folded resin films and bonding the three peripheral portions 20a to 20c of the resin film. In the accompanying drawings, the material of the small packaging bag 20 is illustrated as being transparent for easy understanding, but is not limited to a transparent material.

  Hereinafter, the operation of the packaging bag manufacturing apparatus 1 will be described. FIG. 3 is an enlarged view of the vicinity of the turntable 4 of the packaging bag manufacturing apparatus 1 shown in FIG.

  First, the small packaging bags 20 containing the products 30 are supplied to the packaging bag manufacturing apparatus 1 by the carry-in conveyor 14 at substantially constant intervals. The supplied small packaging bag 20 is held by the input conveyor 2, transferred to a predetermined position, and input to the rotating plate 4 that rotates intermittently in one direction R at regular time intervals. That is, the input conveyor 2 includes two rotating means 2a and 2b, a belt 2c that rotates in one direction by them, and a plurality of blades 2d arranged at equal intervals on the belt 2c. Each small packaging bag 20 to be supplied is pushed out by the belt of the carry-in conveyor 14 and mounted on the blade 2d. The small packaging bag 20 mounted on the blade 2d is transferred by the rotation of the belt 2c, and is pushed out by the first extruding means 3 at a position where it overlaps the concave portion 4a formed in the rotating turntable 4, and is put into the concave portion 4a. The FIG. 4 is a cross-sectional view showing a state where the small packaging bag 20 is put into the recess 4a. Here, the concave portion 4a includes an acute angle portion 4b that is in contact with the peripheral portion 20a along the longitudinal direction of the peripheral portion 20a of the small packaging bag 20, a right angle portion 4c that faces the acute angle portion 4b, and the small packaging bag 20 with little play. Is formed by the side wall portion 4d having a shape capable of holding the small packaging bag 20 so as to be substantially along the normal direction of the outer periphery of the turntable 4. The adjacent distance L of the plurality of recesses 4a is shorter than the depth D of the recesses 4a.

  The small packaging bag 20 put into the recess 4a is transferred to the position of the presser plate 5 by the intermittent rotation of the turntable 4, and the peripheral part 20a is sandwiched between the presser plate 5 and the acute angle part 4a. As shown by the broken line in FIG. Further, the small packaging bag 20 is transferred to the vicinity of the first roller 6 by the rotation of the rotating disk 4 with the peripheral portion 20a being bent.

  The film sheet S is sandwiched between the first roller 6 and the turntable 4, and the peripheral portion 20 a of the small packaging bag 20 and the film sheet S are overlapped with each other by the rotation of the turntable 4. In the state, it is transferred to the vicinity of the heat bonding means 9. Here, the film sheet S is preliminarily tensioned by the first to third rollers 6 to 8 and the rotating disk 4 and is along the rotating disk 4 without bending.

  The heat bonding means 9 includes heating means (not shown) for maintaining the four end portions 9a to 9d at a predetermined high temperature, and moves toward the turntable 4 every time the turntable 4 stops intermittently. Then, after contacting the overlapping portion between the peripheral portion 20a of the small packaging bag 20 and the film sheet S for a predetermined short time at the first end portion 9a, the first end portion 9a returns to the original position. Thereby, the overlapping part of the film sheet S and the small packaging bag 20 is heated. Further, when the turntable 4 stops next time, the heat bonding means 9 moves again toward the turntable 4, and the second end portion 9 b comes into contact with the overlapping portion heated by the first end portion 9 a. After heating, the original position is restored. By repeating this, the same overlapping portion is heated four times by the end portions 9a to 9d. The temperature of the end portion 9a is set so that the peripheral portion 20a of the small packaging bag 20 and the film sheet S are heated and melted and bonded by the four times of heating. Thus, a packaging bag 21 (hereinafter, referred to as one-end linked packaging bag) 21 is formed in which peripheral portions 20a that are one ends of the plurality of small packaging bags 20 are bonded to the film sheet S at substantially equal intervals.

  Thereafter, when the turntable 4 is rotated, the small packaging bag 20 is transferred to the vicinity of the second roller 7, and the overlapping portion between the peripheral portion 20a of the small packaging bag 20 and the film sheet S which is heated and melted and bonded. Is cooled. Further, the small packaging bag 20 is transferred to the second and third rollers 7 and 8 by the rotation of the turntable 4. The perforation cutter 10 disposed between the second roller 7 and the third roller 8 moves toward the rotating disk 4 every time the rotating disk 4 stops intermittently, and the film is formed by the blade 10a at the tip. The sheet S is pressed against the right-angled part 4c of the turntable 4, and the film sheet S is formed with a perforation that facilitates the separation of each small packaging bag 20 later. Thereafter, the perforation cutter 10 is separated from the turntable 4 before the turntable 4 starts to rotate again, and quickly returns to the original position.

  Further, the small packaging bag 20 is transferred beyond the third roller 8 and the cutting cutter 11 moves toward the turntable 4 every time the turntable 4 stops intermittently a predetermined number of times. The film sheet S is cut by pressing against the right angle portion 4c of the turntable 4. Accordingly, the long one-end connected packaging bag 21 is divided into one-end connected packaging bags 22 each having a predetermined number of small packaging bags 20. FIG. 3 shows a case where, after the cutting cutter 10 is moved once, the cutting cutter is moved again at the seventh stop of the turntable 4 to cut the film sheet S. 22 includes seven small packaging bags 20. 5A and 5B are schematic views showing the divided one-end connected packaging bag 22, wherein FIG. 5A is a plan view and FIG. 5B is a cross-sectional view taken along line BB in FIG. As shown to (b), the space | interval of the position where the small packaging bag 20 is adhere | attached on the film sheet S is shorter than the length of the small packaging body of an adjacent direction.

  The divided one-end connected packaging bag 22 is pushed out from the recess 4 a of the turntable 4 by the second pushing means 12 and mounted on the carry-out conveyor 15. Thereafter, the divided one-end connected packaging bag 22 is, for example, transported to a shipping inspection place, and after inspection, packed and shipped.

  Above, the overlapping part of the peripheral part 20a of each small package 20 and the film sheet S is heated four times in order by the four end parts 9a to 9d of the heat bonding means 9 to melt and bond. However, the number of end portions of the heat bonding means 9 and the number of times of heating by contacting the overlapping portion are not limited to this. Depending on the material of the film sheet S and the small package 20, the temperature of the end may be adjusted, and for example, it may be bonded by heating twice or heating once. When the overlapping portion is bonded by one heating using the heat bonding means 9 having four end portions 9a to 9d, the heat bonding is performed once every time the rotating disk 4 stops intermittently four times. The means 9 only needs to move as described above, whereby four small packaging bags 20 can be adhered to the film seal S at a time.

  Moreover, although the case where the roller also serves as cooling of the heated bonded portion has been described, a cooling unit may be provided adjacent to the heating bonding unit 9. For example, similarly to the heat bonding means 9, a cooling means having a plurality of cooling end portions arranged at the same interval as the interval of the recesses 4a is provided, and the cooling means is rotated when the rotating disk 4 stops intermittently. You may make it move toward the board | substrate 4 and press the edge part for cooling on the heated adhesion part, and you may make it cool.

  Further, the peripheral portion 20a of the small packaging bag 20 is bent by the presser plate 5 before being heated by the heat bonding means 9, but is provided with heating means such as a heater, whereby the presser plate 5 is attached to the small packaging bag 20. If the peripheral portion 20a is heated to such an extent that the peripheral portion 20a is softened, the peripheral portion 20a can be easily bent, can be bonded with high accuracy, and work efficiency is improved.

  Moreover, although the case where the recessed part 4a of the turntable 4 was a shape which can hold | maintain the small packaging bag 20 in the substantially upright state was demonstrated, it is not limited to this shape, The peripheral part 20a of the small packaging bag 20 is a turntable. The angle θ formed with the outer periphery of 4 may be an arbitrary angle. For example, as shown in FIG. 6, the recess 4 a may be formed so that the small packaging bag 20 is inclined with respect to the normal direction V of the outer periphery of the turntable 4 (θ <90 degrees). By forming the concave portion 4a in this way, one side surface of the peripheral portion 20a of the small packaging bag 20 comes closer to the outer periphery of the turntable 4, and the presser plate 5 (FIG. 3) is unnecessary. it can.

  Further, the shape of the recess 4a of the turntable 4 is not limited to the shape shown in FIGS. 4 and 6, and the width is close to the thickness of the small packaging bag to be held, and the small packaging bag can be held with little play. The depth may be any depth that allows the peripheral portion 20a to protrude from the recess 4a.

  Moreover, although the case where the peripheral part 20a of the small packaging bag 20 was adhere | attached on this using the film sheet S was demonstrated above, the length of the peripheral part 20a of the small packaging bag 20 is adjacent distance L of the recessed part 4a. Alternatively, the small packaging bag 20 may be formed so as to be longer than the adjacent peripheral portions 20a. FIG. 7 shows a one-end connected packaging bag formed by overlapping a part of a peripheral portion 20a of adjacent small packaging bags 20 with each other, bonding the overlapped portion by heating and melting with a heating adhesive means 9, and then cutting with a cutting cutter 11. 23. The cut end 23 a is the remaining part of the peripheral portion 20 a cut by the cutting cutter 11. Therefore, the film sheet S and the film supply means 13 are not necessary for manufacturing the one-end connected packaging bag having the shape shown in FIG. Further, the heating bonding means 9 moves and bonds the overlapping portions every time the rotating disk 4 is stopped intermittently, but if the heating bonding means is not moved every predetermined number of intermittent stops, the cutting cutter is used. 11 is also unnecessary. For example, when the rotary disk 4 is intermittently stopped for the first to sixth times, the heating bonding means 9 moves to bond the overlapping portion, but at the seventh intermittent stop, the heating bonding means 9 does not move. If it does so, the one end connection packaging bag with which the seven small packaging bags 20 were connected can be manufactured, without cut | disconnecting. The one-end connected packaging bag in this case has a shape in which the cut end 23a is eliminated from the one-end connected packaging bag 23 shown in FIG.

It is the schematic which shows the packaging bag manufacturing apparatus which concerns on embodiment of this invention, (a) is a front view, (b) is a top view, (c) is a right view. It is a perspective view which shows the small packaging bag with which the product was thrown in. It is an enlarged view of the turntable part of the packaging bag manufacturing apparatus shown in FIG. It is sectional drawing which shows the state with which the small packaging bag shown in FIG. 2 was hold | maintained at the recessed part of the rotary disk. It is the schematic which shows the state with which the some small packaging bag shown in FIG. 2 was adhere | attached on the film sheet, (a) is a top view, (b) is sectional drawing in the BB line. It is sectional drawing which shows an example which inclines a recessed part and forms in a turntable. It is sectional drawing which shows an example of the one end connection packaging bag formed without using a film sheet. It is a perspective view which shows the conventional continuous packaging bag. It is a perspective view which shows the form by which the end of the confectionery bag was stuck to the holding material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Packaging bag manufacturing apparatus 2 Loading conveyor 3 1st extrusion means 4 Turntable 4a Recessed part 5 Holding plate 6-8 First to 3rd roller 9 Heating adhesion means 10 Perforation cutter 11 Cutting cutter 12 Second extrusion means 13 Film supply means 14 Carry-on conveyor 15 Carry-out conveyor 20 Small packaging bags 21, 22 One-end linked packaging bags

Claims (9)

A device for manufacturing a packaging bag in which one end of a plurality of small packaging bags is connected,
A small packaging body holding means for accommodating the small packaging bag, having a plurality of recesses in an outer peripheral portion whose adjacent distance is shorter than the depth, and intermittently rotating in a predetermined direction;
Contact means for bringing the peripheral portion of the small packaging bag protruding from the concave portion into contact with one surface of the sheet-shaped holding member;
An adhesive means disposed on the other surface side of the holding member and generating heat;
When the small packaging body holding means stops intermittently, the bonding means contacts the overlapping portion of the peripheral portion of the small packaging bag and the holding member, and heats and bonds the overlapping portion. An apparatus for manufacturing a packaging bag.   The packaging bag manufacturing apparatus according to claim 1, further comprising a pressing unit configured to bend the peripheral portion protruding from the concave portion along an outer periphery of the small package body holding unit. A device for manufacturing a packaging bag in which one end of a plurality of small packaging bags is connected,
A small packaging body holding means for accommodating the small packaging bag, having a plurality of recesses on the outer peripheral portion whose adjacent distance is shorter than the depth, and intermittently rotating in a predetermined direction;
A peripheral part that protrudes from the recess longer than the adjacent distance is bent along the outer periphery of the small package body holding means, and at least a part of the peripheral part is overlapped with at least a part of the peripheral part of the adjacent small packaging bag. A pressing means for forming an overlapping portion;
An adhesive means for generating heat,
An apparatus for manufacturing a packaging bag, wherein when the small package holding means stops intermittently, the adhesive means contacts the overlapping portion and heats and bonds the overlapping portion. Input means for inputting the small packaging bag into the recess;
The apparatus for manufacturing a packaging bag according to any one of claims 1 to 3, further comprising a cutting unit that separates the plurality of bonded small packaging bags into a predetermined number. The adhesive means comprises a plurality of heated ends disposed at the same spacing as the adjacent distance;
After the adhering means moves, the adhering means moves each time the small package holding means intermittently stops the number of times equal to or less than the number of the end portions, and each of the end portions contacts the overlapping portion. The manufacturing apparatus of the packaging bag as described in any one of Claims 1-4 characterized by the above-mentioned. The pressing means includes a heating means,
The packaging bag manufacturing apparatus according to any one of claims 2 to 5, wherein the peripheral portion protruding from the recess is heated and softened by the overheating means.   The said recessed part hold | maintains the said small packaging bag so that the said peripheral part which protrudes from the said recessed part may incline in the direction opposite to the rotation direction of the said small packaging bag holding means. The manufacturing apparatus of the packaging bag as described in the said item. A method of manufacturing a packaging bag in a form in which one end of a plurality of small packaging bags is connected,
A charging step of charging the small packaging bag into each of the plurality of recesses having an adjacent distance shorter than the depth, provided in the small package body holding means that intermittently rotates in a predetermined direction,
A contact step in which a peripheral portion of the small packaging bag protruding from the concave portion is brought into contact with one surface of a sheet-shaped holding member, and is superimposed;
A method for manufacturing a packaging bag, comprising: an adhesion step of heating and bonding an overlapping portion between the peripheral portion and the holding member when the small package body holding means stops intermittently. A method of manufacturing a packaging bag in a form in which one end of a plurality of small packaging bags is connected,
A charging step of charging the small packaging bag into each of the plurality of recesses having an adjacent distance shorter than the depth, provided in the small package body holding means that intermittently rotates in a predetermined direction,
A peripheral part that protrudes from the recess longer than the adjacent distance is bent along the outer periphery of the small package body holding means, and at least a part of the peripheral part is overlapped with at least a part of the peripheral part of the adjacent small packaging bag. A presser step for forming an overlapping portion;
And a bonding step of heating and bonding the overlapping portions when the small package holding means intermittently stops.

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