JP2012232803A - Packaging bag with fitting tool and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag with a fitting tool, along with a method of manufacturing the same, capable of stably manufacturing even a fitting tool with a narrow width without failure in unsealing.SOLUTION: There is provided a packaging bag 70 with a fitting tool. The fitting tool 10, in which a claw unit 40 is provided at a pair of base members formed in a band shape having a width of 2.5 to 4 mm along a longitudinal direction of the base member, and in which the claw unit 40 is unevenly distributed in a lateral direction of the base member, is heat sealed to a bag by a heat seal bar having a width of 100 to 180% relative to the width of the base member and is attached to an edge of an opening so that the side where the claw unit 40 is unevenly distributed is at a content side 72 of the bag and that at least some of a side end at an opening side of the base member is not heat sealed.

Description

  The present invention relates to a packaging bag with a fitting and a method for manufacturing the packaging bag with a fitting.

  Provided with a pair of band-shaped fittings having a claw unit consisting of a male part and a female part at the edge of the opening of the bag body, and packaging with a fitting tool capable of opening and closing the bag body by opening and closing the claw unit. Bags are used in various fields such as medical products and industrial products as well as foods. In such a packaging bag body with a fitting tool, the fitting tool is generally heat-sealed to the bag body.

  By the way, one of the important characteristics required for the packaging bag with fittings is that the bag can be easily opened from the opening side.

  When the packaging bag with a fitting tool is opened from the opening side, the force is transmitted to the fitting tool from the most part of the fitting tool that is heat-sealed. Therefore, when the portion on the opening side of the fitting tool is not heat-sealed to the bag body, the force for opening the bag is hardly transmitted to the portion. Therefore, in order to transmit the force for opening the bag body to the claw unit, at least the portion on the opening side of the claw unit must be heat-sealed to the bag body.

  At the stage where the fitting tool is heat-sealed, the fitting tool meanders, and the fitting tool may be partially displaced from the original position. However, in the manufacture of a conventional packaging bag with a fitting tool, it is common to use a fitting tool in which a claw unit is provided along the longitudinal direction of the base member in the center of a band-shaped base member having a width of 8 to 15 mm. A heat seal bar that is somewhat larger than the claw unit can be used. Therefore, since the size of the heat seal bar has a margin for the shift width of the claw unit, the fitting tool in which the portion closer to the opening than the claw unit of the fitting tool is heat-sealed to the bag body. The bag body could be manufactured stably.

  For example, in the case of heat-sealing a fitting tool having a width of 13 mm, in the prior art, a heat seal bar having a concave groove and having the same width as that of the fitting tool is used. At this time, the heat seal bar is set so that the groove portion is located at the position of the claw unit of the fitting tool. Therefore, if the claw unit fits into the groove portion, a small deviation may be corrected. In addition, even if the fitting tool meanders, the width of the heat seal bar is several times larger than the gap width of the claw unit, so the part on the opening side of the fitting tool's claw unit is stable to the bag body. And heat-sealed.

  However, in recent years, fitting tools having a narrow width of about 3 mm have become widespread for reasons such as the design of packaging bags with fitting tools. Since such a fitting tool has a narrow width, a region other than the claw unit of the fitting tool is narrow. Therefore, if a heat seal bar having a concave groove that does not thermally bond the claw unit portion is used, the fitting tool cannot be firmly heat-sealed to the bag body. Therefore, in this case, a heat seal bar without a concave groove is used. At this time, assuming that the fitting tool meanders, a heat seal bar having a width of 3 to 5 mm that is slightly wider than the fitting tool is used. However, the width of the heat seal bar does not have a sufficient margin for the shift width of the claw unit, and the portion closer to the opening than the claw unit of the fitting is often not thermally fused to the bag body. .

  Such a packaging bag with fittings is very difficult to efficiently transmit force to the claw unit, and cannot be easily opened from the opening side. Therefore, there is a method for stably manufacturing a packaging bag body with a fitting tool in which at least a portion on the opening side of the claw unit is firmly heat-sealed to the bag body, and there is no problem in opening from the opening side. is necessary.

  Therefore, a concave groove for introducing the fitting tool is provided in the bag manufacturing apparatus, the position of the fitting tool is fixed at the time of heat sealing, and the fitting tool can be accurately heat-sealed to the bag body. A manufacturing method and a manufacturing apparatus are provided (see Patent Document 1).

Japanese Patent No. 3640437

  However, in the technique of Patent Document 1, there is a problem that a dedicated manufacturing apparatus must be used each time a narrow fitting tool is used.

  Accordingly, the present invention provides a fitting that can stably produce a packaging bag with a fitting that does not cause a trouble in opening even if the fitting is narrow, and the fitting is heat-sealed. Provided are a packaging bag with a fitting and a method for producing the packaging bag with a fitting.

  The packaging bag with fitting tool of the present invention is a packaging bag body with fitting tool in which the fitting tool is attached to the edge of the opening of the bag body, and the fitting tool has a width of 2. A pair of base members formed in a strip shape of 5 to 4 mm are provided with a claw unit along the longitudinal direction of the base member, and the claw unit is detachably fitted to the male part of the ridge and the male part. The side where the claw unit is unevenly distributed is formed by a heat seal bar having a width of 100% to 180% of the width of the base member. The fitting is heat-sealed to the bag so that the side end of the base member on the opening side is not heat-sealed. .

  Furthermore, the present invention provides (a) a step of folding back a long bag base film along the longitudinal direction, and (b) a fitting tool as a method for producing such a packaging bag with a fitting tool. The step of disposing the fitting unit between the bag base film and the longitudinal direction of the bag base film with the side where the claw unit is unevenly distributed is the folded portion side of the film And (c) the bag base film is heated and pressurized from the outside by a heat seal bar having a width of 100% to 180% with respect to the width of the base member, so that the base member is opposite to the folded portion. A step of heat-sealing a fitting to the inside of the base film for a bag so that at least a part of the side end portion is not heat-sealed; and (d) the folded back portion of the base film for a bag At regular intervals in the direction crossing the base film for bags Heat sealing to a plurality of locations; and (e) cutting the bag body film along the heat-sealed surface to continuously obtain a plurality of packaging bags with fittings. The manufacturing method of the packaging bag body with a fitting tool containing is provided, It is characterized by the above-mentioned.

  According to the fitting tool of the present invention, it is possible to stably produce a packaging bag body with a fitting tool that does not cause a problem in opening even with a narrow fitting tool that has been widespread in recent years. . Moreover, the manufacturing method does not need to use a dedicated manufacturing apparatus, and can be carried out easily.

It is a perspective view which shows an example of the fitting tool of this invention. It is a front view which shows an example of the bag body for packaging with a fitting tool in embodiment of this invention. It is a perspective view which shows an example which heat-seal | fuses the fitting tool of this invention to the base film for bags. It is sectional drawing to which the fitting tool periphery of FIG. 3 was expanded. It is a perspective view which shows an example of obtaining the some packaging bag body with a fitting tool from the bag body base film of this invention. It is sectional drawing which shows a mode that it is going to open the packaging bag body with a fitting tool of this invention from the outer side. It is sectional drawing which shows a mode that it is going to open the conventional packaging bag body with a fitting tool from which the heat-fusion part of the fitting tool shifted | deviated to the contents side.

  FIG. 1 is a perspective view showing an example of the fitting tool of the present invention. The fitting 10 has a claw unit 40 comprising a male part 20 of a ridge and a female part 30 detachably fitted to the male part, and a first base member 50 and a second base member in the form of strips. 60.

  The width of the first base member 50 (from the end 52 to the end 53) and the width of the second base member 60 (from the end 62 to the end 63) are substantially equal, each in the range of 2.5 to 4 mm.

  The male part 20 of the claw part unit 40 is composed of a trunk part 21 rising vertically from the first base member main body 51 and projecting parts 22 and 23 at the tip thereof. The longitudinal direction of the base member is provided on the first base member 50. And is unevenly distributed in the lateral direction. That is, the distance a from the center 41 of the claw unit to the end 52 of the base member is longer than the distance b from the center 41 of the claw unit to the end 53 of the base member (a> b).

  The female portion 30 of the claw unit 40 includes a first arm 31 and a second arm 32 that rise from an arc shape from the second base member main body 61, and the second base member 60 has a longitudinal direction of the base member. It is provided along.

  Further, the female portion 30 is unevenly distributed in the short direction of the base member similarly to the male portion 20, and the distance a from the center 41 of the claw unit to the end 62 of the base member is from the center 41 of the claw unit. It is longer than the distance b to the end 63 of the base member (a> b).

FIG. 2 is a front view of an example of the packaging bag with a fitting of the present invention.
In the packaging bag body 70 with a fitting tool of the present invention, the fitting tool 10 is heat-sealed inside the bag body near the opening 71. At this time, the fitting 10 is attached so that the side where the claw unit 40 is unevenly distributed is on the contents side 72 of the bag. That is, the distance a from the center 41 of the claw unit to the end 11 of the fitting tool (corresponding to the ends 52 and 62 of the base member) is equal to the end 12 of the fitting tool (the end of the base member). Longer than the distance b).

Next, the manufacturing method of the packaging bag body 70 with a fitting tool of this invention is demonstrated based on FIG.3 and FIG.4 and FIG. FIG. 3 is a perspective view of an example when the fitting tool 10 is heat-sealed to the bag base film 80, and FIG. 4 is an enlarged sectional view of the periphery of the fitting tool shown in FIG.
The long bag base film 80 is folded back in half along the longitudinal direction. Between the base material film 80 for bags, the fitting 10 is arrange | positioned so that the longitudinal direction of this base film may be followed.

  At this time, the fitting 10 is installed so that the side where the claw unit 40 is unevenly distributed is on the side of the folded portion 82 of the film. Accordingly, the distance a from the base member ends 52 and 62 on the film end 81 side to the center 41 of the claw unit is equal to the base member ends 53 and 63 on the film turn-back portion 82 side. It is longer than the distance b up to 41.

  After that, the fitting tool 10 is heat-sealed to the inside of the bag base film 80 by heating and pressurizing the bag base film 80 from the outside with the heat seal bar 90. At this time, the center 91 of the heat seal bar is set near the center 13 of the fitting. However, there is a possibility that the position of the fitting tool 10 is shifted during the heat fusion. The heat seal bar 90 has a width of 100% to 180% with respect to the width of the base member.

After the fitting tool 10 is heat-sealed to the bag body film 80, a portion corresponding to the side portion 73 of the fitting-equipped packaging bag body is heat-sealed. FIG. 5 shows a perspective view of an example of this state.
The film portion 83 from the folded portion 82 of the film to the end 81 of the film is heat sealed. The film portions 83 to be heat-sealed are set at a plurality of positions with a certain interval. Then, the cutting | disconnection of the film along a heat seal surface, for example, the cutting | disconnection along the center line 84 of the film part 83 heat-sealed, is performed, and the several packaging bag body 70 with a fitting tool is obtained.

A state of opening the packaging bag 70 with a fitting tool to which the fitting tool 10 of the present invention is heat-sealed from the opening side will be specifically described with reference to FIG.
When opening the packaging-equipped packaging bag 70 from the outside, the opening 71 of the bag is opened to the outside. At this time, the force for opening the opening 71 is transmitted to the fitting 10 from the parts 54 and 64 that are heat-sealed on the most opening side of the fitting 10. Then, the force is transmitted to the male part 20 and the female part 30 of the claw unit, and the first arm 31 of the female part is opened to the opening side and is disengaged from the protruding part 22 of the male part. Opening opens the packaging body 70 with a fitting tool.

  Here, it is particularly important that the force for opening the opening 71 of the bag body is transmitted to the male part 20 and the first arm 31 of the female part.

  According to the present invention, the fitting 10 is heat-sealed so that the side where the claw unit 40 is unevenly distributed in the short direction is on the contents side of the bag. At this time, the heat seal bar 90 is set in the vicinity of the center of the fitting 10 in advance. In other words, since the heat seal bar is set on the opening 71 side of the claw unit 40, the opening side of the fitting 10 is more stably fused to the bag body than the claw unit 40 of the fitting 10 even if a deviation occurs. Worn (see FIG. 4).

  Therefore, the portions 54 and 64 heat-sealed on the most opening side of the fitting 10 are located closer to the opening side of the bag body than the base portion 24 of the male portion and the base portion 33 of the female portion, and the opening portion 71 of the bag body. Since the force for opening the bag is sufficiently transmitted to the claw unit 40, there is no problem in opening the bag.

Similarly, the manner in which the bag body is similarly opened from the opening side will be described with reference to FIG. The fitting tool 110 is exactly the same as the fitting tool 10 of the present invention except that the claw unit is provided in the center in the short direction of both base members.
When the fitting tool 110 is heat-sealed, if the position of the fitting tool 110 is shifted, the portion of the claw unit 140 may not be completely heat-sealed to the bag as shown in FIG. In this case, portions 154 and 164 of the fitting tool 110 that are heat-sealed to the bag body on the most opening side are the bag body than the root 124 of the male part 120 and the base 133 of the female part 130 of the fitting tool 110. On the content side 172 of Accordingly, the force applied to the opening 171 of the bag body is not sufficiently transmitted to the first arm 131 of the female part, so it is difficult to open the packaging bag body 170 with a fitting tool from the opening side. It is. For this reason, the fitting tool 110 cannot stably manufacture a packaging bag with a fitting tool that does not cause a problem when opened.

  The fitting 10 of the present invention is not limited to the illustrated example. For example, two pairs of claw unit may be provided on both base members. Moreover, the fitting tool which has two or more nail | claw part units which consist of a male part and the female part which detachably fits with this male part may be sufficient.

  Moreover, the manufacturing method of the packaging bag 70 with a fitting tool of the present invention is not limited to the illustrated example. For example, it is not always necessary to halve the bag base film, and two bag base films may be stacked.

  Hereinafter, the Example and comparative example of this invention are shown concretely and compared. In addition, this invention is not limited by the matter described below.

Example 1
As a material of the fitting 10 according to the present invention, an ethylene / α-olefin copolymer resin having a density of 916 kg / m ³ and a melt flow rate of 8.5 g / 10 min is 50% by weight, a density of 921 kg / m ³ , and a melt flow rate. A resin composition comprising 50% by weight of a low density polyethylene resin of 5.0 g / 10 min was prepared.

  These resin compositions are melt-kneaded at 160 ° C. using an extruder, led to a deformed die in which the claw unit 40 is unevenly distributed in the short direction of the base member as shown in FIG. After being led to the cooling water tank and cooled and solidified, it was wound up by a winder to obtain the fitting 10. The distances a and b from both ends of the base member to the center 41 of the claw unit are 1.8 mm and 1.0 mm, respectively.

Comparative Example 1
The fitting tool 110 shown in FIG. 7 was obtained in the same manner as in Example 1 except that a deformed die having a claw unit 140 at the center of both base members was used.

Evaluation of the fitting 10 of Example 1 and the fitting 110 of Comparative Example 1 was performed as follows.
Using a side seal bag making machine with a zipper, a single layer film of linear low density polyethylene (thickness 80 μm) is used to make a bag at a shot rate of 40 sheets / min. And 170 were obtained. The heat seal bar 90 used for heat-sealing the fitting tool had a width of 3.5 mm and was contacted at 180 ° C. for 2.5 seconds.

  The force which opens the opening part of a bag body was applied to the packaging bag bodies 70 and 170 with a fitting tool of Example 1 and Comparative Example 1, respectively. At this time, the packaging bag with fitting tool 170 was not easily opened, and the packaging bag with fitting tool 70 could be easily opened.

  According to the present invention, even a narrow fitting tool can be heat-sealed to the bag body more stably on the opening side than the claw unit of the fitting tool. That is, the present invention provides a fitting that stably obtains a packaging bag with a fitting that does not cause a problem when opening, the packaging bag with the fitting, and the packaging with the fitting The manufacturing method of the bag body can be provided. This is useful in various fields such as foods, pharmaceuticals, and industrial products.

DESCRIPTION OF SYMBOLS 10 Fitting tool 20 Nail | claw part male part 30 Claw part female part 40 Claw part unit 50 1st base member 60 2nd base member 70 Bag body for packaging with fitting tool 72 Contents side of bag body 80 Bag Body film 82 Body folded part 90 Heat seal bar

Claims (2)

A fitting bag with a fitting tool attached to the edge of the opening of the bag body,
The fitting tool is provided with a claw unit provided along a longitudinal direction of the base member on a pair of base members formed in a band shape having a width of 2.5 to 4 mm. It consists of a female part that is detachably fitted with the male part, and is unevenly distributed in the short direction of the base member,
By the heat seal bar having a width of 100% to 180% with respect to the width of the base member, the side where the claw unit is unevenly distributed becomes the contents side of the bag body, and the side end on the opening side of the base member A packaging bag with a fitting, wherein the fitting is heat-sealed to the bag so that at least a part of the portion is not heat-sealed. A method for continuously producing a packaging bag with a fitting according to claim 1,
(A) a step of folding back a long bag base film along the longitudinal direction;
(B) The side where the nail | claw part unit of the fitting tool is unevenly distributed is made into the folding | turning part side of a film, and a fitting tool is set to the longitudinal direction of this base material film for bag bodies between the said base material films for bag bodies. The step of arranging along,
(C) The base member film for bag is heated and pressurized from the outside by a heat seal bar having a width of 100% to 180% with respect to the width of the base member, and the side end of the base member opposite to the folded portion A step of heat-sealing the fitting inside the base film for a bag so that at least a part of the portion is not heat-sealed;
(D) a step of heat-sealing the base material film for a bag body at a plurality of positions with a certain interval in a direction crossing the base material film for the bag body from the folded portion;
(E) cutting the base film for a bag body along the heat-sealed surface, and continuously obtaining a plurality of packaging bag bodies with a fitting tool. Production method.

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