JP2017222393A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag whose opening can be linearly opened, and which can be used for a heated retort food, with no risk of contamination during a manufacturing process.SOLUTION: Provided is a packaging bag comprising: a packaging bag body constituted of a laminate including at least polyethylene terephthalate films and sealant layers with a peripheral edge part of the sealant layers adhesively attached to each other; and an opening guide tape stuck to a part to be opened with the packaging bag body torn linearly across the packaging bag body. The outermost layer of the packaging bag body is formed of a polyethylene terephthalate film; the linear cut tape is a laminate or a single film including a uniaxial drawing polyethylene terephthalate film with tearing anisotropy; and a surface of the linear cut tape, which is stuck to the packaging bag body, and a part of the packaging bag body, to which the linear cut tape is stuck, are provided with heat sealability by laser beam irradiation, and thermally welded to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging bag. In particular, the present invention relates to a packaging bag based on a plastic film that has excellent openability, can prevent contamination in the manufacturing process, and can be used for retort foods.

  As the packaging bags, those composed of a single body or a laminate with a plastic film as a base material are widely used, and various forms are used for a wide range of applications. On the other hand, as a problem of a packaging bag using such a plastic film or a laminate thereof, unsealing property can be mentioned.

  Unlike bottles and bottles provided with clear opening members such as caps and lids, the packaging bag is generally used by the user himself / herself tearing and opening the packaging bag. As a result, some users cannot open the package, and even if it can be opened, it cannot be opened cleanly, and the contents cannot be used by spilling or splashing the contents. There were problems such as burns when hot.

  Therefore, in order to improve the opening property of the packaging bag, a packaging bag having an easy opening property is known. As a means for giving easy opening, for example, a cut is provided on the outer edge of the packaging bag to trigger tearing at the position where opening is started, and the opening is guided linearly. For example, an easy-open line with vulnerability is provided.

  Alternatively, by attaching a straight-cut film piece with the property that the tearing easily proceeds in a specific direction to the packaging bag, etc., so that the tearing proceeds on the film piece. It has also been made possible to open.

  For example, Patent Document 1 discloses an easy-open bag in which a straight-cut resin film is mounted near the opening of a packaging bag body. However, when sticking a straight-cut film using a pressure-sensitive adhesive or adhesive in the manufacturing process, the pressure-sensitive adhesive or the adhesive sticks out and adheres to the pressure-bonding roll used for sticking, and this sticks to the packaging bag again. Further, foreign matters may adhere and become contaminated during the distribution process, which has been a problem. In addition, the pressure-sensitive adhesive has a low heat resistance, and there is a problem that it cannot be used for a packaging bag for retort foods with heating.

Japanese Patent Laid-Open No. 11-208687

  The present invention has been made in view of such a situation, and is a packaging bag that can be used for heated retort foods and that can be opened linearly at the opening, without the possibility of contamination in the manufacturing process. The issue is to provide.

In order to solve the above problems, the invention described in claim 1
A packaging bag body formed by laminating a peripheral portion of a sealant layer of a laminate having at least a polyethylene terephthalate film and a sealant layer;
A packaging bag having a linear cut tape bonded across the packaging bag body at a site where the packaging bag body is linearly cut and opened,
The outermost layer of the packaging bag body is a polyethylene terephthalate film,
A linear cut tape is a laminate or a single piece containing a uniaxially stretched polyethylene terephthalate film having tear anisotropy,
A heat-sealing property is imparted to the surface of the linear cut tape to be attached to the packaging bag main body and the portion of the packaging bag main body to which the linear cut tape is to be applied by laser light irradiation, and heat-sealed by heat sealing. It is a bag.

The invention according to claim 2
The packaging bag according to claim 1, wherein a gas barrier layer is provided on the outermost polyethylene terephthalate film of the packaging bag body.

The invention according to claim 3
The packaging bag according to claim 2, wherein the gas barrier layer is an inorganic compound layer.

  In the present invention, not only can the linear cut tape be applied to the site where the packaging bag is opened, but it is possible to perform a straight and clean cut, and the linear cut tape can be applied to the packaging of the linear cut tape. The surface to be attached to the bag body and the part to which the linear cut tape of the packaging bag body is attached are heat-sealed by laser light irradiation and heat-sealed by heat sealing. When affixing to the bag body, an adhesive is not used, and there is an effect that there is no fear of contamination due to the protrusion of the adhesive and the adhesion to a pressure bonding member such as a pressure roller and reattachment.

  In addition, since an adhesive having low heat resistance is not used, the present invention has an effect that it can be applied to retort foods that are heated during use.

  Further, by providing a gas barrier layer on the polyethylene terephthalate film, it is possible to prevent the contents from being oxidized and to further improve the storage stability.

  In addition, by making the gas barrier layer an inorganic compound layer, it becomes possible to make the packaging bag body transparent, so that the contents can be visually confirmed, and the gas barrier layer is applied to a metal foil or a metal vapor deposition film. In this case, it can be applied to the use of heating in a microwave oven, which could not be used, and it is further preferable because disposal after disposal becomes easy.

The whole plane schematic diagram which shows one Embodiment of the packaging bag of this invention. The fragmentary sectional view of the packaging bag of this invention. Explanatory drawing which shows the condition in the middle of opening of the packaging bag of this invention.

  DETAILED DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the examples shown here.

  FIG. 1 is an overall schematic plan view for explaining an embodiment of a packaging bag according to the present invention. The packaging bag (1) has a packaging bag body (2) having a polyethylene terephthalate film as the outermost layer and a sealant layer, and a linear cut tape made of a uniaxially stretched polyethylene terephthalate film having tear anisotropy attached to the surface. (3).

  As the polyethylene terephthalate film, a biaxially stretched polyethylene terephthalate film can be used. In this case, since the film strength is relatively large and the expansion and contraction due to heat is small, it is possible to perform stable production in the production of the laminate and the packaging bag, so that the film is more preferably used.

  Moreover, since the toughness as a packaging bag is provided by using a biaxially stretched polyethylene terephthalate film, a favorable result is obtained in each scene where the packaging bag is used.

  When a packaging bag is formed using a polyethylene terephthalate film as the outermost film, it alone has an effect of improving the gas barrier performance as compared with the case of using a polyolefin-based resin film.

  The packaging bag body (2) is provided with a storage part (7) for heat-sealing the peripheral part (6) of the front-side laminated body (10) and the back-side laminated body (not shown) to store the contents inside. ing.

  When configuring the laminate, the material configuration and the layer configuration can be designed in accordance with the use of the packaging bag and the required quality. For example, to hide the contents of the packaging bag from the outside, a concealing layer and a colored layer can be provided, and information and images relating to the contents and products can be provided as a printed layer on the layer visible from the outside. .

  When used in the actual filling step, one side of the peripheral portion is opened as a filling port, and after filling the contents from there, the opening is heat sealed and sealed.

  A virtual straight line (9) indicating a desired opening from the part of the cut (4) is provided at the peripheral edge of the packaging bag body (2), which is a starting point when the package bag is torn and opened. The linear cut tape (3) is affixed over the packaging bag body (2) up to the peripheral edge facing upward.

  The straight cut tape (3) has a tear anisotropy that is easy to tear in the stretching direction but difficult to tear in the direction perpendicular to it in order to promote the straight progress of the tear. A uniaxially stretched polyethylene terephthalate film is used. In FIG. 1, it is provided so that it can be easily torn in the direction of a virtual straight line (9) indicating a desired opening. The same linear cut tape is affixed also to the substantially same position of the laminated body of the back side.

  FIG. 2 is a partially enlarged schematic view showing an enlarged cross section of the packaging bag of FIG. In the laminates (10) and (20), the outermost polyethylene terephthalate films (11) and (21) and the sealant layers (13) and (23) are laminated, and the outermost polyethylene terephthalate films (11) and (21 The gas barrier layers (12) and (22) can be provided on the inner surface of the packaging bag.

  By providing the gas barrier layer, it is excellent in gas barrier properties, for example, oxygen permeability, water vapor permeability, etc. can be kept low, so that a packaging bag with excellent contents preservability can be realized.

  For the gas barrier layer, a metal foil such as an aluminum foil can be used as the gas barrier layer. If it is not appropriate to use a metal foil, a laminate may be formed by laminating a gas barrier film having gas barrier properties. The metal foil and the gas barrier film can be laminated using an adhesive, for example, using a dry lamination method, or can be laminated by extruding a thermoplastic resin using an extruder.

  Moreover, an inorganic compound layer can be directly provided as a gas barrier layer on the inner surface of the polyethylene terephthalate film packaging bag. This gas barrier layer can be composed of a vapor deposition layer and a coating layer of an inorganic compound. After an anchor coat layer is provided on a polyethylene terephthalate film, a vapor deposition layer and a coating layer are sequentially provided.

  For the anchor coat layer, for example, urethane acrylate can be used. For the formation of the anchor coat layer, a coating method in which a printing method such as gravure coating is applied to a paint in which a resin is dissolved in a solvent is used, and a coating film can be formed using a generally known coating method.

  As a method of forming a vapor deposition layer, an inorganic compound such as SiO or AlO is formed on a base film provided with an anchor coat layer using a vacuum vapor deposition method, and an inorganic compound layer is formed by a vacuum vapor deposition method. can do.

  An inorganic compound layer has a gas barrier property only by a vapor deposition layer formed by a vacuum vapor deposition method, but a coating layer of an inorganic compound layer formed by a coating method is formed to overlap with a vapor deposition layer that is an inorganic compound layer formed by a vacuum vapor deposition method to form a gas barrier layer. Can do.

  As a method for forming a coating layer of an inorganic compound layer, an aqueous solution containing at least one of a water-soluble polymer and (a) one or more alkoxides or hydrolysates thereof, or (b) tin chloride. Alternatively, a coating agent mainly composed of a water / alcohol mixed aqueous solution is applied and dried by heating to form an inorganic compound layer by a coating method to form a coating layer. At this time, the adhesion with the anchor coat layer can be improved by adding a silane monomer to the coating agent.

  By combining these two layers, a reaction layer of both layers is formed at the interface between the inorganic compound layer by the vacuum deposition method and the inorganic compound layer by the coating method, or the inorganic compound layer by the coating method becomes an inorganic compound layer by the vacuum deposition method. A dense structure is formed by filling and reinforcing defects such as pinholes, cracks, and grain boundaries, or by reinforcing them, so that high gas barrier properties, moisture resistance, and water resistance are achieved, and flexibility that can withstand deformation is achieved. Therefore, it can also be suitable as a packaging material.

  In addition, when SiO is used as the gas barrier layer, it is transparent. Therefore, if the other layers constituting the laminate are transparent, the contents can be seen from the outside of the packaging bag. In addition, since it does not include a metal layer, it can be applied to cooking using a microwave oven. These may be selected appropriately according to the use of the packaging bag and the required quality.

  Parts (5) and (25) where the linear cut tapes (3) and (33) are attached to the outermost polyethylene terephthalate film are the linear cut tapes (3) and (33) and the outermost polyethylene terephthalate film (11). , (21) are both heat-sealed by laser light irradiation and are heat-welded without an adhesive or adhesive.

  Since no adhesive or adhesive is used, dirt from sticking out of the adhesive or adhesive will not adhere, and since the adhesive is not used, it should be used without problems for retort food applications that involve heating. Is possible.

The expression of heat sealability is performed by drawing and irradiating the portion to which heat sealability is imparted using a continuous irradiation type laser beam. As the laser light, for example, a carbon dioxide laser having an infrared wavelength whose energy is easily absorbed by the polyethylene terephthalate film layer can be used. As a result, it is possible to realize heat sealability with high energy efficiency and high safety.

  The laser oscillator is not limited to a specific type as long as it is a laser beam having an infrared wavelength. The heat-sealability is exhibited by the alteration of the polyethylene terephthalate film in the portion irradiated with the laser beam.

  Therefore, heat sealing performance can be imparted more efficiently by selectively irradiating the welded portions (8) and (38) of the packaging bag body with laser. Further, the laser beam can be irradiated in the form of drawing a continuous line, an intermittent line, or a dot pattern. Or planar irradiation can also be performed. Such a shape can be formed by appropriately setting the spot diameter, the spot shape, etc. of the laser beam.

  FIG. 3 is a partial perspective schematic view showing a state in the middle of opening when the packaging bag of the present invention is actually opened. From the cut (4), an opening (15) for pouring the contents is formed as the tearing proceeds on the linear cut tapes (3) and (33).

  Since the straight cut tapes (3) and (33) are easy to tear in a virtual straight line direction indicating a desired opening, the straight cut tapes (3) and (33) can be cut linearly.

  Thus, according to the present invention, it is a packaging bag made of a laminate having a polyethylene terephthalate film as the outermost layer, which has excellent openability, can prevent the occurrence of dirt in the manufacturing process, etc. It is possible to provide available packaging bags.

  Hereinafter, based on an Example, this invention is demonstrated further more concretely. However, the present invention is not limited only to these examples.

<Example 1>
The test body of the packaging bag shown in FIG. 1 was created under the following conditions.
・ Linear cut tape A tearing anisotropic polyethylene terephthalate film (Embret PC (manufactured by Unitika)) (12 μm) is bonded to a normal polyethylene terephthalate film (12 μm), and laser irradiation processing is performed on the entire surface of the normal polyethylene terephthalate film. Heat-sealability was imparted and slit to 5 mm width to obtain a linear cut tape.
・ Packaging bag body polyethylene terephthalate film (12μm) /
Al foil (7μm) /
Unstretched polypropylene resin sealant layer (30μm)
The bag body prepared by laminating in this order was subjected to laser irradiation processing with a width of 5 mm on the part to which the linear cut tape of the polyethylene terephthalate film, which is the outermost surface, was attached, thereby imparting heat sealability.
-In each laser irradiation processing, laser irradiation processing was performed at an output of 21 W using a carbon dioxide laser device ML-Z9510 manufactured by Keyence Corporation.
-The part which gave the heat-seal property of a linear cut tape and the packaging bag body was heat-welded face to face, and it was set as the test body.

  When the specimen was torn from the incision with fingers and a tear test was conducted according to the following evaluation criteria, the tear was straightened and good opening was achieved.

1 ··· Packaging bag 2 ··· Packaging bag body 3, 33 ··· Opening guide tape 4 ··· Cut 6 · · · Peripheral portion 7 ··· ··· Storage portions 8 and 38 ··· Welding portion 9 ··· Virtual lines 10 and 20 indicating desirable opening · · Laminates 11 and 21 · · Polyethylene terephthalate films 12 and 22 .... Sealant layer 15 ... Opening A ...

Claims (3)

A packaging bag body formed by laminating a peripheral portion of a sealant layer of a laminate having at least a polyethylene terephthalate film and a sealant layer;
A packaging bag having a linear cut tape bonded across the packaging bag body at a site where the packaging bag body is linearly cut and opened,
The outermost layer of the packaging bag body is a polyethylene terephthalate film,
A linear cut tape is a laminate or a single film containing a uniaxially stretched polyethylene terephthalate film having tear anisotropy,
A heat-sealing property is imparted to the surface of the linear cut tape to be attached to the packaging bag main body and the portion of the packaging bag main body to which the linear cut tape is to be applied by laser light irradiation, and heat-sealed by heat sealing. bag.   The packaging bag according to claim 1, wherein a gas barrier layer is provided on the outermost polyethylene terephthalate film of the packaging bag body. The packaging bag according to claim 2, wherein the gas barrier layer is an inorganic compound layer.