JP2005199540A - Method for producing bag with zipper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a bag with a zipper which makes two bag bodies be processed simultaneously in the attachment of the zipper, can attach them to two opening pieces with male and female zippers engaged, and can reduce bag making costs by improving the efficiency of bag making. <P>SOLUTION: On both sides of a side to be the spout of the flatly and cylindrically formed bag body 5 having a pair of facing plane parts 2 and 3, a notch 8 which makes the plane parts 2 and 3 on the side to be the spout the two opening pieces is applied. After the two opening pieces are opened, and the zipper 6 is supplied between their facing surfaces, the opening pieces and the zipper 6 are welded together. Both sides of the overlapped opening pieces are welded along the inside edge of the notch 8. The outside edge side of the welded side part welding part 11 is cut, removed to finish with the bag. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a bag with a zipper, such as a flat bag or a gusset bag, in which a mouth for taking out contents can be opened and closed by a zipper.

  Bags used as storage containers for various products include flat bags and gusset bags with folds on both sides.

  In the former flat bag, two sheets were stacked and heat-sealed at the four edges, and one sheet was folded into a tube shape so that both sides overlapped at the center position, and this sheet was stacked There is a central joint-attached bag in which both sides are heat-sealed to form a bag body, and the center-joint-attached bag is frequently used because it has a better appearance than a bag heat-sealed on the four edges.

  The latter gusset bag has a structure in which two sheets are overlapped and a folding member folded between two opposite surfaces is sandwiched, and the end of each sheet and the end of the folding member are heat sealed to form a bag body It has become.

  By the way, in the above-mentioned flat bags and gusset bags, a bag in which a mouth for taking out contents can be opened and closed by a zipper even after opening has been proposed.

  In order to provide a zipper with respect to the above-described flat bag or gusset bag, it is necessary to incorporate a zipper on the mouth side of the bag during the bag making process of the bag body and weld it.

As a conventional specific method of attaching the zipper to the bag body, the flat portion on the side that becomes the mouth portion of the bag main body formed in a flat cylindrical shape having a pair of opposed flat portions is formed from the end portion. Two opening pieces are formed by the cuts on both sides facing the direction, and the two opening pieces are folded outwards opposite to each other. After that, the male and female zippers are engaged with each other, and both sides of the two open pieces are welded in a state where the two open pieces are overlapped (see, for example, Patent Document 1).
Japanese Patent No. 3209445 (FIGS. 1 to 5)

  By the way, the above zipper attachment method requires that the cuts on both sides of the bag body and the two opening pieces be welded on both sides independently and separately on both sides. Therefore, the increase in the number of man-hours results in poor bag-making efficiency, which increases the bag-making cost.

  In addition, the method of separately attaching the male zipper and the female zipper to the two opening pieces has a problem that the number of steps increases and becomes complicated, and the efficiency of bag making is reduced.

  Accordingly, an object of the present invention is to allow the processing of the zipper to be carried out on the bag body at the same time with respect to the two bag bodies, and to attach to the two opening pieces in a state where the male and female zippers are engaged. Another object of the present invention is to provide a method for manufacturing a bag with a zipper, which can reduce bag manufacturing cost by improving the efficiency of bag manufacturing.

  In order to solve the above-described problems, the invention of claim 1 is directed to the side serving as the mouth on both sides of the side serving as the mouth of the bag body formed in a flat cylindrical shape having a pair of opposed flat portions. A step of cutting the planar portion into two open pieces, a step of opening the two open pieces and supplying a zipper between the opposing surfaces, and then welding the open piece and the zipper, A configuration is adopted in which both sides of the double-opened piece are welded along the inner edge of the notch and a finishing step is performed to cut and remove the outer edge side of the welded portion.

  The invention of claim 2 employs a configuration in which the front end side of the double-opening piece is welded between the step of welding both sides of the double-opening piece along the inner edge of the notch and the finishing step in the invention of claim 1. Is.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the zipper is configured such that the male zipper and the female zipper are engaged with each other and supplied between the two open pieces. The structure which welds an opening piece and a female zipper simultaneously is employ | adopted.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the bag main bodies are arranged in close proximity to each other, and a notch is formed so that the flat portion on the side serving as the mouth portion becomes two open pieces. The structure which performs simultaneously a process and the finishing process which cuts and removes the outer edge side of the welded part with respect to the bag main body adjacent to both sides is employ | adopted.

  The invention of claim 5 employs a configuration in which, in the invention of any one of claims 1 to 4, the bag body is one of a flat bag and a gusset bag.

  Here, the bag body uses a heat-sealable synthetic resin sheet, and the flat bag is folded in a cylindrical shape so that both sides of the sheet overlap at the center position. It is a center-gap-attached bag that heat seals the bag body, and the gusset bag sandwiches two folded sheets between two opposite surfaces by overlapping two sheets, and the end of each sheet It has the structure which made the bag main body by heat-sealing the edge part and the edge part of a folding member.

  In addition, a non-welding process is performed in advance on the overlapping surface of the male zipper and the female zipper in the zipper and the overlapping surface of the folding member in the case of the gusset bag.

  According to the present invention, on both sides of the bag body which is the mouth side, the flat portion on the side serving as the mouth portion is cut into two open pieces, and the two open pieces are opened between the opposing surfaces. After supplying the zipper, this open piece and the zipper were welded, and both sides of the overlapped open piece were welded along the inner edge of the notch, and the outer edge side of this welded part was cut and removed. The zipper can be cut, welded, and cut and removed from the bag body at the same time for the two bag bodies at the same time. Compared with the case where it carries out, a process can be halved and, thereby, the bag making cost of a bag with a zipper can be reduced.

  Moreover, it can attach with respect to two opening pieces in the state which engaged the male and female zipper, and can improve the efficiency of bag making by the reduction of the number of processes.

  On both sides of the bag main body formed in the shape of a flat cylinder having a pair of opposed flat portions, notches that make the flat portion on the side of the mouth into two open pieces are provided. After opening the two open pieces and supplying the zipper between the opposing faces, the open piece and the zipper are welded, and both sides of the double open pieces are welded along the inner edge of the notch, and this welded part Finish by cutting off the outer edge side.

  1 to 7 show the manufacturing method of the first embodiment in which the zippered bag is a flat bag. The flat bag 1 uses a synthetic resin sheet that can be heat-sealed. A bag is formed by folding both sides of the sheet overlapped to form a back seal 4 by folding them into a flat cylindrical shape having a pair of opposing flat portions 2 and 3 so that both sides overlap at the center position. The main body 5 is formed such that one end of the bag main body 5 is a mouth portion and the other end is a bottom portion, and the mouth portion for taking out the contents can be opened and closed by the zipper 6 even after opening, and the bottom portion is heat-sealed after filling the contents. It is a central gassho sticking bag.

  In order to attach the zipper 6 to the mouth of the bag body 5 as described above, as shown in FIG. 1, the bag bodies 5 are arranged in parallel and close to each other at regular intervals, and a large number of bag bodies 5 are arranged in the parallel direction. A transfer line 7 to be transferred is installed, and a notch 8 is formed in the middle of the transfer line 7 so that the flat portions 2 and 3 on the side of the bag body 5 become the two opening pieces 2a and 3a. After supplying the zipper 6 between the blade 9 and the opposing surface between the two opening pieces, the zipper welding mechanism 10 for welding the opening pieces 2a, 3a and the zipper 6, and both sides of the double opening pieces 2 and 3 formed in an overlapping manner Are welded along the inner edge of the notch 8, and the side welding mechanism 12 that forms the side welding portion 11, and the end that forms the end welding portion 13 by welding the tips of the double-opening pieces 2a and 3a The outer edge side of the welding mechanism 14 and the side welding part 11 of the double-opening pieces 2a and 3a is cut and removed. A manufacturing apparatus in which the second blade 15 to be finished is arranged at a predetermined interval is used.

  In the case of the illustration, the manufacturing apparatus has shown an example in which the bag body is transferred and processed in a straight line, but each processing mechanism may be arranged in a circle and the bag body may be transferred and processed in a circle. .

  The above-described cutting by the first blade 9 and the second blade 15 and the side welding mechanism 12 for forming the side welding portion 11 are performed simultaneously on the two bag bodies 5 adjacent to both sides. ing. This cutting and welding are performed on the two bag main bodies 5 on both sides simultaneously by forming the notch 8 and the side welded portion 11 on one side adjacent to each other. This is the same as providing the notches 8 and the side welds 11 on both sides simultaneously.

  To attach the zipper 6 to the mouth of the bag body 5, as shown in FIG. 1 and FIG. The main body 5 is intermittently transferred in the parallel direction, and as shown in FIGS. 1, 2 (B) and FIG. 4, the first blade 9 becomes the mouth on both sides of the bag body 5, which is the mouth. A notch 8 for making the side flat portions 2 and 3 into two open pieces 2a and 3a is formed in a J-shape that is bent in an arc from the tip inward and outward.

  This notch 8 uses, for example, the first bag 9 formed in a long U shape having a width of about 20 mm, and the adjacent bag main bodies 5 are arranged so that the interval between adjacent side edges is 18 mm. 5 is performed at the same time with respect to the side edges of the bag 5, and each time the bag body 5 is intermittently transferred at an interval equal to the parallel pitch and stops at a position corresponding to the first blade 9, the first blade 9 is adjacent. Each bag body 5 having a notch 8 having a width of 1 mm at the same time on the side edges of the two bag bodies 5 and passing through the portion of the first blade 9 is an end serving as a mouth as shown in FIG. A notch 8 having a J-shape is provided on both sides of the portion, and the flat portions 2 and 3 on the side that becomes the mouth of the bag body 5 become two open pieces 2a and 3a that can be separated.

  The two bag bodies 5 that have passed through the first blade 9 move to the welding mechanism 10 of the zipper 6, and in this welding mechanism 10, the two opening pieces 2 a and 3 a of the two bag bodies 5 are respectively connected. It opens up and down using a suction means, and the zipper 6 is supplied between the vertically opened pieces 2a and 3a, and the vertically opened pieces 2a and 3a and the zipper 6 are welded.

  As shown in FIG. 5, the zipper 6 is composed of a male zipper 6a and a female zipper 6b using a thermoplastic synthetic resin, and the two zipper 6a and the female zipper 6b are engaged with each other. 3a is supplied from the transfer direction, which is the width direction of the bag body 5, and then the upper and lower opening pieces 2a and 3a are overlapped to release the suction. Positioned above and below 3a, the heating and pressurizing means simultaneously welds the one opening piece 2a and the male zipper 6a and the other opening piece 3a and the female zipper 6b.

  As shown in FIG. 6, this welding is performed by welding the opening pieces 2a and 3a along the length direction of both sides of the zipper tape of the male zipper 6a and the female zipper 6b.

  The supply of the zipper 6 between the two opening pieces 2a and 3a is set so as to be slightly inward from the ends of the opening pieces 2a and 3a, and the overlap between the male zipper 6a and the female zipper 6b in the zipper tape By performing a non-welding process on the surface in advance, the overlapping open pieces 2a and 3a and the male zipper 6a and the female zipper 6b can be welded simultaneously.

  Even if the supply and welding process of the zipper 6 between the upper and lower opening pieces 2a and 3a is performed simultaneously on the two bag bodies 5 on both sides, the zipper 6 is welded on the two bag bodies 5 on both sides. May be performed separately.

  The two bag bodies 5 on both sides move to the side welding mechanism 12 at the next position by transfer. In this welding mechanism 12, one side of the double-opening pieces 2a and 3a that are overlapped by the upper and lower heating and pressing means. Are welded with a predetermined width along the inner edge of the cutout 8 to form the side welded portion 11 as shown in FIGS.

  In the said side part welding part 11, the zipper 6 located between the double piece 2a and 3a used as this side part welding part 11 is crushed so that it may become flat by heating and pressurization.

  This side welded portion 11 is provided on the two sides of the bag body 5 on both sides by simultaneously performing welding along the inner edge of the notch 8 on each adjacent side, so that one bag can be cycled. This is the same as applying the side welded portions 11 to both sides of the main body 5 at the same time.

  Moreover, the bag main body 5 formed with the side welded portion 11 is formed so that the ends of the double-opening pieces 2a and 3a are overlapped by the upper and lower heating and pressurizing means of the end welded mechanism 14 provided at the next position. The end welded portion 13 is formed by linear welding with a predetermined width over the entire length in the width direction.

  Note that the end welded portion 13 may be welded in a step prior to the side welded portion 11, and the end welded portion 13 and the zipper 6 are interposed as shown in FIGS. 6 and 7. The non-welded portion 16 for opening and closing the zipper 6 by cutting when the bag body 5 is opened is formed.

  The two bag bodies 5 on both sides move to the position of the second blade 15 at the next position by transfer, and the second edge 15 cuts and removes the outer edge side of the side welded portion 11 into a J shape. Thus, both sides of the mouth side of the bag body 5 are finished.

  The second blade 15 is formed in a long U shape having a width of about 22 mm, for example, and simultaneously cuts the side welded portion 11 of the adjacent bag body 5. When the welding burr 17 of the partial welded portion 11 is cut and removed, the portion of the zipper 6 that is located between the two side bag main bodies 5 and that protrudes from the side welded portion 11 is also cut from the bag main body 5, thereby FIG. ) And the flat bag 1 with the zipper is completed as shown in FIG.

  The second embodiment of FIGS. 8 to 11 shows a manufacturing method in which the zippered bag is a gusset bag. As shown in FIG. 8, the gusset bag 21 uses a synthetic resin sheet that can be heat-sealed. Two sheets are overlapped, and a folding member 22 that is folded in half using the same material as that of the sheet is sandwiched between both opposing surfaces, and the overlapping state of the two sheets and the folding member 22 is sandwiched by a heating and pressing means. The edge portions on both sides of each sheet and the edge portion of the folding member 22 are simultaneously heat-sealed to form a bag body 24 as the welded portion 23.

  The overlapping surface of the folding member 22 is subjected to a non-welding process in advance so that the overlapping surface of the folding member 22 is not welded during the heat sealing.

  In order to attach the zipper 6 to the mouth portion of the bag body 24 as described above, since the attachment is performed in substantially the same process using the same manufacturing apparatus as in the first embodiment described above, the first implementation is performed here. The same reference numerals as those in the first embodiment are used for the same parts as in the example, and different parts will be described mainly in order to avoid duplication.

  In order to attach the zipper 6 to the mouth portion of the bag body 24, the bag bodies 24 are arranged in parallel in close proximity at a predetermined interval on the transfer line, and a large number of bag bodies 24 are intermittently transferred in the parallel direction. 1 is a notch 8 for making the flat portions 25 and 26 on the side serving as the mouth into two open pieces 25a and 26a on the one side serving as the mouth of the bag body 24. Is applied in a J shape in which the end is bent in an arc from the tip to the inside and outward.

  This notch 8 is performed simultaneously with respect to the side edge of the adjacent bag body 24, and the bag body 24 is intermittently transferred at intervals equal to the parallel pitch and stopped at a position corresponding to the first blade 9. In addition, the first cutting tool 9 is simultaneously provided with a notch 8 on the side edge of the adjacent bag body 24, and each bag body 24 that has passed through the first cutting tool 9 portion is provided on both sides of the mouth side. A notch 8 having a J-shape is applied, and as shown in FIG. 9, the flat portions 25 and 26 on the side of the bag main body 24 become two open pieces 25a and 26a that can be separated. The folding member 22 is interposed freely.

  The two bag main bodies 24 that have passed through the first blade 9 move to the welding mechanism 10 of the zipper 6 shown in FIG. 1, and in this welding mechanism 10, the two bag main bodies 24 each have two openings. The pieces 25a and 26a are opened up and down by using a suction means, and the zipper 6 is supplied so as to pass between the one open piece 25a and the folding member 22 between the vertically opened pieces 25a and 26a as shown in FIG. At the same time, the upper and lower opening pieces 25a and 26a and the zipper 6 are welded.

  The zipper 6 is engaged with the male zipper 6a and the female zipper 6b, and is supplied between the two opening pieces 25a and 26a from the transfer direction which is the width direction of the bag body 24, and thereafter, the upper and lower opening pieces 25a 26a is overlapped to release the suction, and after the suction means is separated, the heating and pressing means are positioned above and below the opening pieces 25a and 26a. By this heating and pressing means, the one opening piece 25a and the male zipper 6a are welded and the other opening is opened. The pieces 26a and the female zipper 6b are welded together, and the overlapping portions of the meshed zipper 6 and the one-open piece 25a and the folding member 22 are welded simultaneously.

  The two bag bodies 24 on both sides move to the side welding mechanism 12 in FIG. 1 at the next position by transfer, and in this welding mechanism 12, the double-opening pieces 25 a and the overlapped pieces 25 a are overlapped by upper and lower heating and pressurizing means. On one side of 26a, the overlapping portion of the double-opening pieces 25a and 26a and the folding member 22 is welded with a predetermined width along the inner edge of the notch 8, and the side welded portion 11 is formed as shown in FIG.

  In the side welded portion 11, the zipper 6 positioned between the opening piece 25 a and the folding member 22 is crushed by heating and pressing so as to become flat, and at this time, the overlapping portion of the folding member 22 is not welded. It is not welded by processing.

  This side welded portion 11 is provided on the two sides of the bag main body 24 at the same time by simultaneously performing welding along the inner edge of the notch 8 on each adjacent one side, so that one bag main body is cycled. This is the same as applying the side welded portions 11 to both sides of 24 at the same time.

  Further, after the side welded portion 11 is formed, the end portions on the mouth side of the double-opened pieces 25a and 26a are overlapped by the upper and lower heating and pressing means of the end welded mechanism 14 provided at the next position in the width direction. The end welded portion 13 is formed by linear welding with a predetermined width over the entire length.

  Note that the end welded portion 13 may be welded in a process prior to the side welded portion 11, and the end welded portion 13 and the zipper 6 are cut when the bag body 24 is opened. Thus, a non-welded portion 16 for opening and closing the zipper 6 is formed.

  The two bag bodies 24 on both sides move to the position of the second blade 15 in FIG. 1 in the next position by transfer, and as shown in FIG. 11, the side edge welded portions 11 of the adjacent bag bodies 24 are By cutting and removing the outer edge side of the side welded portion 11 into a J shape by the second cutter 15, if both sides on the mouth side of the bag body 24 are finished, the welding burr 17 of the side edge welded portion 11 is formed. Simultaneously with the cutting and removal, the portion of the zipper 6 located between the side bag main bodies 24 and protruding from the side edge welded portion 11 is also cut off from the bag main body 24, whereby the gusset bag 21 with the zipper is completed.

The top view of the manufacturing process which shows the manufacturing method of the 1st Example whose bag with a zipper is a flat bag (A) is a plan view before processing the bag body, (B) is a plan view with notches on both sides, (C) is a plan view with a zipper inserted, D) is a plan view with welding, and (E) is a completed plan view. The perspective view which shows the bag main part of the center gassho sticking bag which is a flat bag Perspective view with notches on both sides of the mouth of the bag body The perspective view which inserted the zipper between the double-opening pieces of the above-mentioned bag body The perspective view which gave welding to the double opening piece of the above-mentioned bag body The exploded perspective view which cut and removed the welding burr | flash of the double piece of the said bag main body The perspective view which shows the bag body of the gusset bag which is a flat bag The perspective view which inserted the zipper between the double-opening pieces of the above-mentioned bag body The perspective view which gave welding to the double opening piece of the above-mentioned bag body The exploded perspective view which cut and removed the welding burr | flash of the double piece of the said bag main body

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flat bag 2 Flat part 2a Opening piece 3 Flat part 3a Opening piece 4 Back seal 5 Bag main body 6 Zipper 7 Conveying line 8 Notch 9 First cutter 10 Zipper welding mechanism 11 Side welding part 12 Side welding mechanism 13 End Part welding part 14 End part welding mechanism 15 Second blade 16 Non-welding part 17 Welding burr 21 Gazette bag 22 Folding member 23 Welding part 24 Bag body 25 Flat part 25a Opening piece 26 Flat part 26a Opening piece

Claims (5)

  A step of forming notches in which the flat part on the side serving as the mouth part is formed into two open pieces on both sides of the side of the bag body formed in a flat cylindrical shape having a pair of opposed flat parts; After opening the two open pieces and supplying a zipper between the opposing surfaces, welding the open piece and the zipper, and welding both sides of the overlapped double pieces along the inner edge of the notch And a finishing step of cutting and removing the outer edge side of the welded portion.   The manufacturing method of the bag with a zipper of Claim 1 which welds the front end side of a double-opening piece between the process of welding both sides of the said double-opening piece along the inner edge of a notch, and a finishing process.   The zipper is configured such that the male zipper and the female zipper are engaged with each other and supplied between the two open pieces, and the one open piece and the male zipper are welded simultaneously and the other open piece and the female zipper are welded simultaneously. Item 3. A method for producing a bag with a zipper according to Item 1 or 2.   The bag body is arranged in parallel and close to each other, and the step of making a notch that makes the flat part of the side that becomes the mouth part into two open pieces and the finishing process of cutting and removing the outer edge side of the welded part are performed on both sides. The method for producing a bag with a zipper according to any one of claims 1 to 3, wherein the method is performed simultaneously on adjacent bag bodies.   The method for manufacturing a bag with a zipper according to any one of claims 1 to 4, wherein the bag body is either a flat bag or a gusset bag.

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