JP2004195886A - Zipper bag and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a zipper bag, which can be opened linearly along the zipper while clearly cutting-away the end by opening it, and to provide a method for manufacturing the same. <P>SOLUTION: In this method for manufacturing a zipper bag, both sides 11, 12 of two films 10, 10, which have been put on top of each other, and three sides of one end 13 are sealed. A zipper 15 for opening/sealing is provided at a position which is near the one end 13 of the films 10, 10, is on the inner side of a tear expected line 16 provided over both side parts 11, 12, and is between the two films 10, 10. A laser beam 30 is applied along the tear expected line 16 of the two films 10, 10. The two films 10, 10 are formed by cutting a sheet material 20 transferred longitudinally so that the tear expected line 16 matches the transfer direction. A laser beam source 31 for applying the laser beam 30 is disposed at a position which is on a transfer path of the sheet material 20 and corresponds to the tear expected line 16. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zipper-equipped bag provided with a zipper that can be hermetically sealed even after being opened, and a method for manufacturing the zipper-equipped bag. About the method.
[0002]
[Prior art]
Various types of bags for storing foods such as ice and bonito cut-off knives are provided with chucks that can be sealed even after opening. For example, in the bag with a zipper shown in FIG. 3, two rectangular films 10, 10 are overlapped, three sides of both sides 11, 12 and one end 13 are sealed, and the other end 14 is sealed. In the vicinity of one end 13, a chuck 15 for unsealing and sealing is provided between the two films 10, 10 across both sides 11, 12. A scheduled tear line 16 is set between the sealed one end 13 and the chuck 15, and a V-shaped, U-shaped or simply cut I-shaped notch 17 is provided at one or both ends of the scheduled tear line 16. Is formed. Then, at the food manufacturer, after the food is stored in the bag from the other end 14 which is the opening, the other end 14 is also sealed and shipped to the market.
[0003]
Then, this bag with a zipper can be opened by tearing one end 13 of the film 10 from the notch 17 along the expected tear line 16 without using scissors or the like. After opening, the required amount of food is taken out and the chuck 15 is sealed, so that the food remaining in the bag can be stored without jumping out and without moisture.
[0004]
However, in a bag with a chuck in which only the notch 17 is formed on the side portions 11 and 12, one end portion 13 of the film 10 is not torn linearly along the expected tearing line 16; In some cases, the edge of the film 10 after the film is formed into a wavy shape, or the shape of the edge of each film 10 may be different from each other. Then, not only the appearance is poor, but also the edge portion of each film 10 is difficult to pick, so that it becomes difficult to open the chuck 15. Further, as shown by the dashed line, the film 10 may be torn from one side 11 toward the edge 10a and be interrupted on the way, and thus the necessity of tearing from the other side 12 arises. come.
[0005]
In view of such a problem, Patent Literature 1 discloses a synthetic sheet bag that can be reliably torn in a straight line. In this synthetic sheet bag, a band-shaped welded portion is formed on the left side, right side, and upper side of the superposed front side sheet material and the back side sheet material, and a strip portion formed by heat welding on the front side sheet material has an upper side. It is provided so as to protrude like a protruding piece along the welding edge of the welding portion. To open the synthetic sheet bag, for example, hold the lower left side of the strip with the left hand, pinch the left end of the strip with the right hand, and pull upward to attach the strip to the base. So that it can be torn in a straight line.
[0006]
[Patent Document 1]
Registered Utility Model No. 3020281 (FIG. 7)
[0007]
[Problems to be solved by the invention]
However, in the synthetic sheet bag disclosed in Patent Document 1, since the strip provided near the upper side of the front sheet material is torn open, the synthetic sheet bag after opening has the upper side of the back sheet material remaining. I do. Therefore, when storing the food in the synthetic sheet with the chuck sealed, the upper side of the remaining sheet material on the back side may become obstructive (jawed) or hinder the opening of the chuck. Sometimes.
[0008]
Therefore, an object of the present invention is to provide a zipper-equipped bag which can be opened linearly along a chuck, and whose end is neatly cut off with opening, and a method of manufacturing the same.
[0009]
[Means for Solving the Problems]
In the method for manufacturing a bag with a chuck according to the present invention, three sides of both sides and one end of the two superposed films are sealed, and over both sides near one end of the film. A method for producing a zipper-equipped bag in which a zipper for opening and sealing is disposed between two films at a position inside a set tearing expected line, wherein each of the two films is torn. It is characterized by irradiating a laser along a line.
[0010]
According to this method for manufacturing a bag with a zipper, by irradiating the laser along the planned tear line of each of the two films, each of the planned tear lines of the two films is damaged along the planned tear line. Alternatively, a notch is formed. Since the tear line is weakened by the scratch or the cut in terms of strength, it is easy to cut, and it is possible to manufacture a zipper-equipped bag which can be reliably and linearly torn along the tear line.
[0011]
In the method for manufacturing a bag with a zipper, the two films may be cut in a sheet material conveyed in a length direction (an arrow direction in FIG. 1) so that the planned tear line coincides with the conveyance direction. It is preferable that the laser light source for irradiating the laser is disposed at a position on the conveyance path of the sheet material corresponding to the planned tear line.
[0012]
According to the manufacturing method of the bag with the chuck, the laser is irradiated along the scheduled tear line by continuously irradiating the laser to the sheet material conveyed in the length direction. That is, the laser irradiation step can be performed in a series of steps of manufacturing the bag with the chuck, and therefore, the productivity is not impaired as compared with the conventional manufacturing method that does not perform the laser irradiation, The bag with a zipper of the present invention can be manufactured at the same cost as a conventional bag with a zipper.
[0013]
Further, a bag with a chuck according to the present invention is characterized by being manufactured by the above method. According to this bag with a zipper, since the tear line is scratched or cut by the laser and is weakened in strength, it can be reliably linearly torn along the tear line.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of a bag with a chuck and a method for manufacturing the bag according to the present invention will be described with reference to FIGS. However, the same parts as those in the related art will be described with the same reference numerals.
[0015]
As shown in FIG. 2, the bag with a zipper according to the present embodiment is sealed on three sides of both sides 11 and 12 and one end 13 of two superposed films 10, and has two sides near one end 13. The laser 30 is irradiated along the scheduled tear line 16 set over 11 and 12, and a slightly melted scratch or cut is formed on the scheduled tear line 16 of the two films 10. It is characterized by.
[0016]
Such a bag with a zipper is manufactured by an apparatus as shown in FIG. First, the two films 10 are formed by cutting a long sheet material 20. The sheet material 20 is unwound from the state wound around the roller 1, and is conveyed in the length direction. The sheet material 20 to be conveyed is cut in the length direction on the downstream side as described later, and is stacked such that the upper side 21 becomes an inner surface that is overlapped with each other and the lower side 22 becomes an outer surface that is exposed.
[0017]
A pair or a plurality of pairs of laser light sources 31 for irradiating the sheet material 20 with the laser beam 30 in a certain direction are arranged on the upstream side of the conveyance path. Each laser light source 31 is arranged so that the laser 30 irradiates the tear line 16 set near one end 13 of the film 10. Therefore, by continuously irradiating the laser material 30 to the sheet material 20 conveyed in the length direction, the laser material 30 is irradiated along the scheduled tear line 16.
[0018]
Further, as described above, since the film 10 is formed by laminating the sheet materials 20 on the downstream side, the tear line 16 set near one end 13 of the film 10 is It is set near the edges 23 and 24. Therefore, the laser light source 31 is disposed near both edges 23 and 24 of the sheet material 20, and the laser 30 irradiates the vicinity of both edges 23 and 24 of the sheet material 20.
[0019]
In addition, according to the material of the sheet material 20 and the intensity of the laser 30, the laser light source 31 is disposed below the sheet material 20 as shown in FIG. Alternatively, it may be arranged above the sheet material 20 to irradiate only the inner surface of the upper side 21 of the sheet material 20, or may be arranged below the sheet material 20 to irradiate both surfaces. And above.
[0020]
A cutter 2 that cuts the sheet material 20 at the center line and a chuck supply unit 5 that supplies the chuck 15 between the sheet materials 20 are arranged downstream of the conveyance path where the laser light source 31 is arranged. . Either the cutter 2 or the chuck supply means 5 may be arranged on the upstream side, or may be arranged side by side.
[0021]
As the chuck 15, for example, a fastener that seals and opens by combining a male ridge and a female recess that elastically engage with each other is employed. Then, in a state where the ridge and the concave are engaged with each other, the chuck supply means 5 adjusts the surface of the non-engaged side of the ridge or the concave near the one edge 23 of the sheet material 20 by the laser. 30 is adhered to a position slightly inside the to-be-teared line 16 irradiated with an adhesive or a heat seal. When the sheet material 20 is transported in the length direction, the chuck 15 is bonded to the sheet material 20 only at the position where the chuck supply means 5 is disposed, and the chuck 15 is continuously attached to the sheet material 20. .
[0022]
A guide (not shown) that holds the other edge 24 of the sheet material 20 and overlaps the one edge 23 of the sheet material 20 is provided downstream of the chuck supply unit 5. A heating means 6 for sealing the material 20 in three directions is provided. The heating unit 6 is configured such that when a pair of parallel two bars provided in the width direction of the sheet material 20 and one bar provided between the bars move up and down in two steps, and move down. This is an apparatus for three-way sealing the sheet material 20 superimposed on the sheet material. In the heating means 6, a blade 7 for cutting the sheet material 20 when lowered is provided at the end of the bar on the downstream side, and a notch is provided at a portion where the scheduled tearing line 16 and the line to be cut intersect. A blade (not shown) forming the projection 17 is provided in a protruding manner. However, these blades 7 may not be provided in the heating means 6 but may be arranged downstream of the heating means 6 with a function of moving up and down.
[0023]
Next, a method of manufacturing a bag with a zipper using such an apparatus will be described. At the upstream position, the sheet material 20 is fed out from the roller 1 and the laser light source 31 irradiates the vicinity of both edges 23 and 24 of the sheet material 20 conveyed in the longitudinal direction from the laser light source 31. The laser 30 irradiates in a certain direction toward both edges 23 and 24 of the sheet material 20, but since the sheet material 20 is conveyed in the length direction, the laser material 30 irradiates the sheet material 20 linearly. A dent or cut is formed in the slightly molten state. When the laser light sources 31 are arranged in a pair, one cut is formed near both edges 23 and 24 of the sheet material 20. When the laser light sources 31 are arranged in a plurality of pairs, a plurality of cuts are formed. Is done.
[0024]
Thereafter, the center line of the sheet material 20 is cut by the cutter 2. Since the sheet material 20 is conveyed in the length direction, the sheet material 20 has two half widths on the downstream side on the upstream side. The chuck 15 is attached to the edge 23 of the cut one sheet material 20 a by the chuck supply unit 5.
[0025]
Thereafter, at the downstream position, the two sheet materials 20a and 20b are overlapped so that the edge 24 of the other sheet material 20b cut by the guide and the edge 23 of the one sheet material 20a are joined. At this time, the cut lines formed by the irradiation of the laser 30 overlap because the laser light sources 31 are arranged at equal intervals from the edges 23 and 24 of the sheet material 20. The chuck 15 attached to one sheet material 20a is also attached to the other sheet material 20b, which is superimposed, with an adhesive or heat sealing.
[0026]
Then, at the downstream position, the heating means 6 descends and joins the two overlapping sheet materials 20a and 20b, whereby the sheet material 20 is three-way sealed. When the heating means 6 is lowered, both ends of the chuck 15 are crushed. When the heating means 6 is provided with the blade 7, the sheet material 20 which has already been sealed and sent to the downstream side is cut off by lowering the heating means 6, and a bag with a chuck in which a notch 17 is formed. Is completed.
[0027]
Such a bag with a chuck is shipped to a food maker or the like with the other end 14 cut by the cutter 2 being an opening. Then, in the food maker, after the food is stored in the bag from the end 14 which is the opening, the end 14 is sealed and shipped to the market.
[0028]
The consumer can open the bag by tearing one end 13 of the zippered bag 13 along the expected tear line 16 from the notch 17 as shown in FIG. A laser 30 is irradiated on the tear line 16 to form a notch thinner than the other portions, and the strength is weakened. Therefore, the bag with a zipper can be reliably torn in a straight line without being torn in a wavy shape or torn toward an edge, and without being interrupted on the way.
[0029]
Then, the ridges and recesses of the chuck 15 are pulled apart, and the stored food can be taken out. Since the end portion 13 of the bag with a zipper is torn linearly, the zipper 15 can be opened very easily. When the food remains in the bag with the zipper, the ridge and the recess are engaged to seal the food, and the remaining food is stored without jumping out and without moisture.
[0030]
It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the technical matters described in the claims. For example, the laser beam may be irradiated after sealing the three sides or after storing the product in a bag and sealing the opening without irradiating the laser beam while the belt-shaped sheet material is being conveyed. In this case, the laser light source may oscillate, and the laser may scan from one end of the scheduled tear line to the other end.
[0031]
【The invention's effect】
According to the present invention, the laser is applied to the scheduled tear line set at one end of the zipper-equipped bag for storing food, and a scratch or a cut is formed. it can. Therefore, the edge portion of the bag protruding from the chuck is easily pinched, the operability of opening the chuck is improved, and the appearance is improved. In addition, since one end is cut off cleanly with opening, the appearance is also good in this regard, and the opening property of the chuck is excellent.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a manufacturing process of a bag with a chuck showing one embodiment of the present invention. FIG. 2 is a partially enlarged perspective view of a bag with a chuck of one embodiment of the present invention. FIG. Front view of bag [Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Film 11 ... Side part 12 ... Side part 13 ... End part 15 ... Chuck 16 ... Planned tearing line 20 ... Sheet material 30 ... Laser 31 ... Laser light source

Claims (3)

Three sides of both sides and one end of the two superposed films are sealed, and at a position near one end of the film inside a tear line set across both sides. A method of manufacturing a bag with a zipper, wherein a zipper for opening and sealing is arranged between two films,
A method of manufacturing a bag with a zipper, comprising irradiating a laser along each of the tear lines of the two films. The two films are formed by cutting the sheet material conveyed in the length direction so that the planned tear line coincides with the conveyance direction,
The method for manufacturing a bag with a zipper according to claim 1, wherein the laser light source for irradiating the laser is disposed at a position on the conveyance path of the sheet material and corresponding to the scheduled tear line. A bag with a zipper produced by the method according to claim 1.

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