JP2009051522A - Method and device for manufacturing bag with zipper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a bag with a zipper, which prevents any air leakage on a zipper side without increasing the man-hours and complicating a manufacturing device of the bag. <P>SOLUTION: A long zipper with a male member and a female member each having a sealing flange being, fitted in each other, is fed and cut into zipper pieces of a predetermined length. The zipper pieces are temporarily sealed to a packaging film, and the packaging film with the zipper is formed in a cylindrical shape with the zipper pieces inside. A back seal and an end seal of a bag are performed, and the bag is filled with the content. The bag with the zipper is manufactured by performing the permanent seal of the flange of the zipper pieces and the packaging film. When the long zipper is cut to the predetermined length, resin residues are left behind on both ends of the zipper piece cut by performing the fusing seal, the resin residues on both ends of the zipper piece are melted when performing the permanent seal of the flange of the zipper piece and the packaging film, and a space of a fold-back portion of the outer packaging film is filled with a resin from both ends of the zipper piece. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a bag with a zipper and an apparatus for manufacturing a bag with a zipper.

  Currently, bags with zipper such as flat pillow pouches and gusset pillow pouches, which are made of a soft packaging film made of a plastic film and have a plastic zipper attached to the opening, are used. In order to manufacture such a pillow-type bag with a zipper, a method using a vertical pillow packaging machine is known.

  Production of a bag with a zipper using a vertical pillow packaging machine is performed as follows. First, a long zipper fitted with a male member and a female member each fitted with a sealing flange is cut into zipper pieces of a predetermined length, and the zipper pieces are temporarily sealed at predetermined positions on a continuous strip of packaging film To do. Next, with a vertical pillow packaging machine, the zipper piece is turned inside and the packaging film with zipper is formed into a cylindrical shape, the back seal and end seal of the bag are performed, the contents are filled, the top seal of the bag and the zipper piece A bag with a zipper is manufactured by performing a main seal between the flange and the packaging film. Note that, for two consecutive bags, the top seal and the main seal of the preceding bag and the end seal of the subsequent bag are performed at the same timing. The bags thus produced are separated one by one.

  By the way, in a bag with a zipper, there is a problem that a gap is formed between the end of the zipper and the folded portion of the bag (zipper side), and the inside of the bag communicates with the outside atmosphere to cause an air leak.

  Conventionally, various techniques have been proposed in order to prevent air leakage at the zipper side of the zippered bag (Patent Documents 1 to 3).

  For example, after the main seal of the zipper piece flange and the packaging film has been proposed, both ends of the zipper piece and the folded portion of the bag are crushed with an ultrasonic horn, and further heat sealed to seal the zipper side. .

  Further, when the main seal of the flange of the zipper piece and the packaging film is used, an apparatus having a mechanism for sealing the central portion of the zipper piece and a mechanism for sealing both ends of the zipper piece is used to simultaneously close the zipper side. A method of sealing is proposed.

On the other hand, when the zipper side is sealed after the main seal as described above or simultaneously with the main seal, it is convenient that both ends of the zipper piece are thin. Then, after extending a long zipper and crushing the part corresponding to the edge part of a zipper beforehand using an ultrasonic horn and making a flange thin, it is also cut | disconnected to the zipper piece of predetermined length.
JP 2003-128090 A JP 2004-3068 A JP 2004-338770 A

  However, to seal the zipper side after the main seal between the flange of the zipper piece and the packaging film as described above or at the same time as the main seal, an ultrasonic horn and a heat seal bar for that purpose are required, which complicates the entire device. To do. Moreover, high positional accuracy is required to seal the zipper side. Further, when the portion corresponding to the end portion of the zipper piece is crushed by using an ultrasonic horn in advance to make the flange thin, an ultrasonic horn and a cutting device are required, which complicates the entire device. Furthermore, if these steps are carried out step by step, the number of man-hours increases, which causes a reduction in the capacity of the packaging machine.

  The objective of this invention is providing the manufacturing method and manufacturing apparatus of a bag with a zipper which can prevent the air leak in a zipper side, without causing the increase in a man-hour and the complexity of an apparatus.

  The manufacturing method of a bag with a zipper according to the present invention supplies a long zipper in which a male member and a female member each having a sealing flange attached thereto are fitted to each other, cuts into a zipper piece of a predetermined length, and a packaging film The zipper piece is temporarily sealed, the zipper piece is inside, the packaging film with zipper is formed into a cylindrical shape, the back sealing and end sealing of the bag are performed, the contents are filled, the flange of the zipper piece and the packaging film In the method of manufacturing a bag with a zipper by sealing the main zipper, the resin residue is left at both ends of the zipper piece cut by performing a fusing seal when the long zipper is cut to a predetermined length, and the flange of the zipper piece When the main film and the packaging film are sealed, the resin residue at both ends of the zipper piece is melted so that the folded portion of the packaging film outside the both ends of the zipper piece Characterized by filling the resin in the gap.

An apparatus for manufacturing a bag with a zipper according to the present invention is as follows.
A packaging film supply mechanism for horizontally supplying the packaging film;
A zipper supply mechanism for supplying a long zipper in which a male member and a female member each fitted with a sealing flange are fitted to each other so as to be orthogonal to the supply direction of the packaging film supplied by the packaging film supply mechanism;
A fusing seal mechanism for cutting the long zipper into zipper pieces of a predetermined length;
A heat sealing mechanism for temporarily sealing the zipper piece to the packaging film;
The zipper piece is inside, the packaging film with zipper is molded into a vertical bag shape, the back of the bag is sealed, the bag is end sealed, the contents are filled in the bag, the flange of the zipper piece and the packaging film And a vertical bag making and filling machine.

  According to the present invention, when a long zipper is cut into a predetermined length, a fusing seal is performed to leave a resin residue on both ends of the cut zipper piece, and when the flange of the zipper piece and the packaging film are finally sealed. The resin residue at both ends of the zipper piece is melted and filled in the gap between the folded portions of the packaging film outside the zipper piece, preventing air leaks on the zipper side without increasing man-hours and complicating the equipment. Can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an apparatus for manufacturing a bag with a zipper according to an embodiment of the present invention. With reference to FIG. 1, the structure of this manufacturing apparatus and the manufacturing method of a bag with a zipper are demonstrated roughly.

  The long wrapping film 10 is fed out from a wrapping film supply reel (not shown), stretched over a plurality of rolls, set in an apparatus, and supplied horizontally. A long zipper 20 in which a male member and a female member, each having a sealing flange attached thereto, are fed from a zipper supply reel 31 and supplied horizontally from a direction orthogonal to the feeding direction of the packaging film 10. . The long zipper 20 is fused by a pair of fusing seal bars 32, and a zipper piece 25 having a predetermined length is formed by fusing twice. The zipper piece 25 is set at a predetermined position by a setting jig 33 and then temporarily sealed on the packaging film 10 by a temporary seal bar 34.

  The packaging film 10 with the zipper piece 25 is wound around the outer periphery of the hollow mandrel 51 of the vertical pillow packaging machine 50 with the zipper piece 25 inside, and is formed into a cylindrical shape. The back seal of the bag is made by the back seal bar 52. The end seal of the bag is made by the end seal bar 53 (at the same time, bag making and filling are performed first, and the top seal of the previous bag located below is made). The bag 70 thus formed is filled with the contents 70 through the hollow portion of the hollow mandrel 51. The bag filled with the contents 70 is sent downward by one length. A top seal bar (not shown) provides a top seal for the bag (at the same time, as described above, an end seal for the subsequent bag located above). Further, the main seal between the flange of the zipper piece and the packaging film 10 is made by the main seal bar 54 at the same timing as the execution of the end seal and the top seal. Further, the packaging film between the end seal of the rear bag and the top seal of the front bag is cut, and the bag with zipper 100 is manufactured.

  Next, each member and each process of the manufacturing method of a bag with a zipper are demonstrated in detail.

  An example of the packaging film 10 will be described with reference to the cross-sectional view of FIG. A heat seal layer 12 made of low density polyethylene (LDPE) is laminated on one surface of a base film 11 made of an aluminum vapor-deposited polyethylene terephthalate (VM-PET) film. On the other surface of the base film 11, a pattern printing film 14 made of a polyethylene terephthalate (PET) film or a stretched polypropylene (OPP) film having a printing layer 13 printed on the surface is laminated.

  As the packaging film 10, a known material used as this type of packaging material can be arbitrarily used. For example, as the base film 11, in addition to the above, a nylon film, an aluminum vapor-deposited nylon film, an aluminum vapor-deposited polypropylene film, and the like can be used. Nylon film can be used as the pattern printing film. In addition to the above-described low-density polyethylene, the heat-seal layer is heat-sealable such as medium-density polyethylene (MDPE), linear low-density polyethylene (L-LDPE), polypropylene (PP), or a copolymer resin thereof. A certain polyolefin-based resin may be formed on a base film by an extrusion method, or the above-described polyolefin-based resin may be formed as a film, and this film may be laminated on a base film using an adhesive. it can.

  An example of the zipper 20 will be described with reference to the cross-sectional views of FIGS. As shown in FIG. 3A, the zipper 20 is in a state where the protruding portion 21 c of the male member 21 and the receiving portion 22 c of the female member 22 are joined together. The male member 21 is formed with an upper flange 21a and a lower flange 21b. The female member 22 is formed with an upper flange 22a. The lower flange 21 b of the male member 21 is temporarily sealed to the packaging film 10. The upper flange 21 a of the male member 21 and the upper flange 22 a of the female member 22 are fully sealed to the packaging film 10. As shown in FIG. 3B, the male member 21 has a two-layer structure using, for example, a high melting point heat sealing resin having a melting point of about 160 ° C. and a low melting point heat sealing resin having a melting point of about 70 ° C. A heat-sealable resin having a low melting point is used for the surface sealed by the packaging film 10. The female member 22 also has the same material and structure as the male member 21.

  A process of forming the zipper piece 25 by fusing the zipper 20 with the fusing seal bar 32 will be described with reference to the cross-sectional views of FIGS. As shown in FIG. 4 (a), a long zipper 20 is horizontally supplied between a pair of fusing seal bars 32, 32 arranged vertically. As shown in FIG. 4B, the zipper 20 is sandwiched between a pair of upper and lower fusing seal bars 32, 32. As shown in FIG. 4C, when the fusing seal bars 32 and 32 are heated, the portion sandwiched between the fusing seal bars 32 and 32 of the zipper 20 is fused and the end portions are welded. At this time, the resin residue 23 remains at the end of the melted zipper 20. As shown in FIG. 4D, the pair of fusing seal bars 32, 32 is returned to the initial position. Thereafter, the zipper piece 25 having a predetermined length is formed by feeding the zipper 20 and performing the above steps again. The zipper pieces 25 thus formed have resin residues 23 at both ends.

  With reference to FIG. 5 (a) and (b), the state which temporarily sealed the zipper piece 25 to the packaging film 10 is demonstrated. 5A is a plan view, and FIG. 5B is a cross-sectional view taken along the line BB in FIG. 5A. As shown in these drawings, the lower flange 21 b of the male member 21 is temporarily sealed 26 on the packaging film 10.

  With reference to the cross-sectional views of FIGS. 6A and 6B, a process of sealing the back of the bag will be described. The packaging film 10 with the zipper piece 25 is wound around the outer periphery of the hollow mandrel 51 of the vertical pillow packaging machine 50 with the zipper piece 25 inside, and is formed into a cylindrical shape. As shown in FIG. 6A, in this state, both edges of the packaging film 10 are heat sealed from both sides by the back seal bars 52, and the back seal 61 of the bag is performed. As shown in FIG. 6B, the back seal 61 is pressed against the back surface of the bag by the holding jig 55.

  7 (a) and 7 (b) show a bag with a zipper in which the end seal and top seal of the bag and the main seal of the zipper piece are made. 7A is a plan view, and FIG. 7B is a cross-sectional view taken along line BB in FIG. 7A. As shown in FIG. 7A, a bag end seal 62 is formed, and after the contents are filled as described above, a bag top seal 63 is formed. Furthermore, as shown in FIGS. 7A and 7B, the main seal 64 between the upper flange 21a of the male member 21 of the zipper piece 25 and the packaging film 10 and the upper flange 22a of the female member 22 of the zipper piece 25 The main seal 64 with the packaging film 10 is made.

  The main sealing process of the zipper piece 25 will be described in more detail with reference to the cross-sectional views of FIGS. As shown in FIG. 8 (a), a pair of books having smooth surfaces (or a linear shape having a width that can seal the zipper) on both sides of the position corresponding to the zipper piece 25. A seal bar 54 is disposed. As described with reference to FIG. 4, the resin residue 23 is formed on both ends of the zipper piece 25. In the stage of FIG. 8A before the main seal, there is a gap between both end portions of the zipper piece 25 and the folded portions on both sides of the bag. As shown in FIG. 8 (b), the pair of main seal bars 54 sandwich the bag. As shown in FIG. 8C, when heat sealing is performed with the main seal bar 54, the resin residue 23 at both ends of the zipper piece 25 is melted, and the gap between the folded portions of the packaging film 10 outside the both ends of the zipper piece 25 is obtained. The melted resin is filled and the zipper piece 5 is firmly attached to the packaging film 10. As shown in FIG. 8D, the pair of main seal bars 54, 54 is returned to the initial position.

  According to the present invention, the following effects can be obtained. First, since the fusing seal is used when forming the zipper piece 25 in the step shown in FIG. 4, the long zipper can be cut in a state where the end of the zipper piece is welded in one step. For this reason, compared with the case where a zipper piece is formed in two steps using an ultrasonic horn and a cutting device as in the prior art, the entire device can be simplified and the number of steps can be reduced. In addition, air leakage on the zipper side can be effectively prevented by utilizing the resin residue left at both ends of the zipper piece when the zipper piece is formed using the fusing seal. That is, when the flange of the zipper piece 25 and the packaging film 10 are finally sealed in the process shown in FIG. 8, the resin residue at both ends of the zipper piece 25 is melted to wrap the packaging film outside the both ends of the zipper piece 25. Since the resin can be filled in the gaps between the portions, air leakage at the zipper side can be effectively prevented. For this reason, it is not necessary to provide an ultrasonic horn or heat seal bar dedicated to the zipper side unlike the conventional apparatus, which greatly contributes to simplification of the entire apparatus.

  Moreover, according to this invention, since a zipper side part is not crushed separately, a bag with a zipper with a good external appearance without a level | step difference can be obtained.

The perspective view which shows the manufacturing apparatus of the bag with a zipper which concerns on-embodiment of this invention. Sectional drawing which shows an example of a packaging film. Sectional drawing which shows an example of a zipper. Sectional drawing explaining the process of forming a zipper piece from a zipper. The top view and sectional drawing explaining the state which temporarily sealed the zipper piece to the packaging film. Sectional drawing explaining the process of back-sealing a bag. The top view and sectional drawing which show the bag with a zipper in which the end seal of the bag, the top seal, and the main seal of the zipper piece were made. Sectional drawing explaining the main sealing process of a zipper piece.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Packaging film, 11 ... Aluminum vapor deposition polyethylene terephthalate (VM-PET) film, 12 ... Heat seal layer, 13 ... Printing layer, 14 ... Pattern printing film, 20 ... Zipper, 21 ... Male member, 22 ... Female member, 21a ... upper flange, 21b ... lower flange, 22a ... upper flange, 23 ... resin residue, 25 ... zipper piece, 26 ... temporary seal, 31 ... zipper supply reel, 32 ... fusing seal bar, 33 ... setting jig, 34 ... temporary Seal bar, 50 ... vertical pillow packaging machine, 51 ... hollow mandrel, 52 ... back seal bar, 53 ... end seal bar, 54 ... this seal bar, 55 ... holding jig, 61 ... back seal, 62 ... end seal, 63 ... Top seal, 64 ... Main seal, 70 ... Contents, 100 ... Bag with zipper.

Claims (2)

  A long zipper fitted with male and female members each fitted with a sealing flange is supplied and cut into zipper pieces of a predetermined length, the zipper pieces are temporarily sealed on the packaging film, and the zipper pieces are placed inside A method for producing a bag with a zipper by forming a packaging film with a zipper into a cylindrical shape, performing back sealing and end sealing of the bag, filling the contents, and finally sealing the flange of the zipper piece and the packaging film When cutting the long zipper to a predetermined length, a fusing seal is used to leave a resin residue on both ends of the zipper piece that has been cut, and the zipper piece is used to seal the flange and the packaging film of the zipper piece. The resin residue at both ends is melted to fill the gap in the folded portion of the packaging film outside the both ends of the zipper piece. Method of manufacturing a par with bags. A packaging film supply mechanism for horizontally supplying the packaging film;
A zipper supply mechanism for supplying a long zipper in which a male member and a female member each fitted with a sealing flange are fitted to each other so as to be orthogonal to the supply direction of the packaging film supplied by the packaging film supply mechanism;
A fusing seal mechanism for cutting the long zipper into zipper pieces of a predetermined length;
A heat sealing mechanism for temporarily sealing the zipper piece to the packaging film;
The zipper piece is inside, the packaging film with zipper is molded into a vertical bag shape, the back of the bag is sealed, the bag is end sealed, the contents are filled in the bag, the flange of the zipper piece and the packaging film And a vertical bag making and filling machine.

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