JP2019077462A - Packaging bag and manufacturing method of the same - Google Patents

Abstract

To provide a packaging bag which can form an easy-to-cut line itself and a pattern for guiding a consumer to the easy-to-cut line without locational deviation, and to provide a formation method of the easy-to-cut line.SOLUTION: A packaging bag is formed by a laminate 1 having a laser coloring layer 20 at least including a base material 10 and ink which develops a color by carbon dioxide gas laser irradiation and a sealant layer 40. An easy-to-cut line 3 is formed in which a coloring part 80 in which the laser coloring layer has developed a color and a fragile processing part 70 in which fragile processing is performed on a base material are overlapped with each other on the same line.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an easy-open packaging bag and a method of manufacturing the same.

  Conventionally, a packaging bag formed by sealing a soft packaging material into a bag shape has been used for various applications including food, medicine and toiletries, but improving the openability of the packaging bag Has become one of the common issues in the field of Here, the subject of the pillow type | mold packaging bag (integrated palm seal bag) which is a general shape is demonstrated.

  The pillow-type packaging bag is formed by bonding both side ends of the package in a combined shape to form a back-sticking seal extending in the height direction, and sealing the bottom and top at both ends of the back-sticking seal. It is formed by forming the bottom seal portion and the top seal portion. In order to open such a packaging bag, an opening notch is provided at the top edge of the seal portion and the bag is opened so as to tear the bag longitudinally, or the opening notch is provided at the edge of the back-sealed portion, and the bag is opened. It is common to open so as to tear horizontally.

  However, for example, when trying to open the lid horizontally, so-called hat trimming, the right-hand packaging material and the left-hand packaging material are facing in the opposite direction centering on the back-sticking seal part, the opening notch of the back-sticking seal edge There is a problem that the crack that started from the above stops at a point where it hangs on the bag body from the back-sticking seal part, and it can not be opened smoothly. Therefore, in order to solve this problem, there is known a packaging bag provided with an opening guiding line (easily cut line) for inducing tearing in the circumferential direction of the packaging bag (Patent Document 1).

  However, since the openability is sharply reduced if the opening guide line is slightly deviated from the opening guide line, a perforation pattern is provided by printing in order to guide the consumer to the open guide line. Although the opening guiding line is cut with a laser by sensor management in accordance with the previously printed perforation, there is a tendency for the detection position of the sensor to shift due to the uneven reflection of the printing substrate or the color of printing. Therefore, if the processing speed is further increased, positional deviation occurs in the printing and the opening guiding line, which makes it difficult to open. Therefore, in order to reduce the positional deviation, there has been a problem that the processing speed must be reduced, and the color and pattern of printing must be restricted for production.

JP, 2011-148546, A

  Therefore, according to the present invention, the easy-cut line itself and the position of the easy-cut line can be visually checked easily by the consumer without lowering the processing speed or setting restrictions on the printing color or pattern, and the easy-cut line It is an object of the present invention to provide a packaging bag and a method for forming an easy-to-cut line, in which a pattern or the like to be induced to tearing is formed without positional deviation.

In order to solve the above-mentioned subject, the invention concerning claim 1 of the present invention is:
A packaging bag formed of a laminate having at least a substrate, a laser coloring layer containing an ink that develops a color by carbon dioxide laser irradiation, and a sealant layer, wherein the coloring part where the laser coloring layer made a color and the substrate are fragile. It is a packaging bag characterized in that an easily cut line is formed in which the fragile processing parts processed are overlapped on the same line.

The invention according to claim 2 is
The packaging bag according to claim 1, wherein the laser coloring layer is intermittently provided in a direction along the fragile processing portion.

The invention according to claim 3 is
It is a packaging bag of Claim 1 or Claim 2 characterized by the said gas barrier layer being provided in the said laminated body.

The invention according to claim 4 is
What is claimed is: 1. A method for producing a packaging bag comprising at least a substrate, a laser coloring layer containing an ink that develops a color by laser irradiation, and a sealant layer, the substrate and the laser coloring layer of the laminate. A laser-coloring portion where the laser-coloring layer is colored by irradiation with a carbon dioxide gas laser and a fragile processing portion where the substrate is fragile-processed are simultaneously provided on the same line, and the laser coloring portion and the fragile processing portion easily overlap It is a manufacturing method of the packaging bag characterized by forming a line.

According to the present invention, a pattern such as a perforated pattern for clearly indicating the position of the fragile processed portion forms a colored portion by causing the laser coloring layer to simultaneously color when the fragile processed portion is provided on the substrate with a carbon dioxide gas laser By being provided on the same line by carrying out, the packaging bag provided with the easy cut line which does not have positional offset of a weak process part and a color development part can be provided. The laminate for forming the packaging bag of the present invention is a laser color forming layer including a base material that absorbs a carbon dioxide gas laser and an ink colored with a carbon dioxide gas laser in order to form a coloring part simultaneously with brittle processing to the base material Hereinafter, it may be simply referred to as "coloring layer". As a result, it is possible to provide a packaging bag in which a coloring portion such as a perforated line is reliably provided at the position of the fragile processing portion of the easy-cut wire.
In addition, since the adjustment of the laser irradiation position can be simplified, the adjustment time of the laser irradiation condition can be shortened, and there is no need to reduce the processing speed, and it is possible to provide a packaging bag which can be efficiently manufactured.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typically the structure of a laminated body which forms one Embodiment of the packaging bag of this invention. It is sectional drawing which shows typically the structure of the laminated body of the modification of one Embodiment of the packaging bag of this invention. It is explanatory drawing which illustrated the aspect by which the fragile process part and the color development part are formed in one Embodiment of the packaging bag of this invention. It is sectional drawing which shows typically the structure of a laminated body which forms another embodiment of the packaging bag of this invention. It is a top view of a layered product which forms a packing bag of the present invention. It is an external appearance top view of the packaging bag of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not construed as being limited to the following embodiments.

FIG. 1 is a cross-sectional view of a laminate 1 forming one embodiment of the packaging bag of the present invention. The substrate 10 is a sheet-like or film-like substrate made of a transparent material that absorbs a carbon dioxide gas laser, and can be exemplified as a polyethylene terephthalate (PET) film that can be suitably used, but is not limited thereto. A laser coloring layer 20 is provided on the back side of the substrate 10, and a sealant layer 40 is laminated via an adhesive layer 30.

  The laminate 1 is provided with perforations 70 by the carbon dioxide gas laser irradiation as an easy cut line 3 which becomes a tearing position when the consumer opens the packaging bag. The shape of the fragile processing portion 70 is not limited to the perforated shape, and may be a broken line shape, a continuous line shape such as a curved line or a wavy line, and is not particularly limited as long as it is an aspect suitable for tearing. The color forming layer 20 of the portion weakly processed by the carbon dioxide gas laser irradiation is simultaneously colored with the carbon dioxide gas laser irradiated at the time of the fragile processing to form a perforated color part 80.

  The coloring portion 80 is provided so that the consumer can easily visually check the tearing position when opening the packaging bag, and it is desirable that the coloring portion 80 be formed in a position which is not misaligned with the fragile processing portion 70. In the packaging bag, since the fragile processing portion 70 and the coloring portion 80 are simultaneously formed on the same line, there is no positional displacement, and the laser irradiation position is printed as in the case where the tear line is displayed in advance by printing or the like. It does not require precise adjustment to match the location of the tear line and can be formed efficiently.

The coloring layer 20 contains a material that develops color when irradiated with a laser beam. Color development by laser light irradiation is, for example, a material that reacts to ultraviolet light and infrared light, as long as it causes a change in color, and the change in color is a chemical or physical change by absorbing the energy of the laser light. Anything may be used. Known materials can be used as the color-developing material, and for example, materials provided with a solvent, a binder, and an oxyanion of a polyvalent metal can be exemplified. Examples of the cation include ammonium, alkali metals and alkaline earth metals, and examples of the oxyanion include molybdic acid compounds, tungstic acid compounds, and similar transition metal compounds.
The color forming layer 20 can be provided by appropriately applying known printing methods and coating methods, and examples thereof include, but are not limited to, gravure printing, gravure offset printing, flexo printing, inkjet printing, roll coating, bar coating, and the like.

  The coloring layer 20 may be provided on the entire surface of the laminate 1, but may be provided only on the portion where the fragile processing portion 70 is provided and the periphery thereof. For example, the color forming layer 20 may be provided in the form of a strip including the fragile processing portion 70 as shown in FIG. 2 in consideration of the amount of mechanical displacement and roughening of the carbon dioxide gas laser irradiation position in fragile processing. The width of the color forming layer 20 in the case of a band is not particularly limited, but preferably about 1 mm to 10 cm, for example. The color developing layer 20 may be a continuous band or an intermittent band.

  FIG. 3 illustrates an embodiment in which the fragile processing portion 70 and the coloring portion 80 are formed in the case where the color forming layer 20 is in the form of a continuous band (a) and in the case where it is in the form of an intermittent band (b). FIG. In the case of a strip-like continuous color forming layer 20, as shown in FIG. 3A, the color forming layer 20 is intermittently irradiated with carbon dioxide gas laser light 210 from the laser light source 200 in the shape of a perforation. The fragile processing portion 70 and the coloring portion 80 are formed. On the other hand, when the color forming layer is in the form of intermittent bands, it may be irradiated in the same manner as in the case of perforations, but as shown in FIG. 3B, even if the carbon dioxide gas laser light 210 is irradiated in a continuous line. good. At this time, since the color forming portion 80 is formed only in the portion where the color forming layer 20 is provided, it has a perforated shape. On the other hand, the fragile processing portion 70 is formed in a continuous linear shape at a position overlapping the color forming portion 80 on the same line. In any of the modes, the perforation-shaped coloring portion 80 overlaps the fragile processing portion 70 without positional deviation, and the easily cut line 3 is formed.

As the adhesive layer 30, a urethane-based adhesive is suitably used. The urethane-based adhesive may be a one-component type or a two-component type, and a commercially available urethane-based adhesive can be appropriately selected and used. The adhesive layer 30 can also be provided by appropriately applying a known printing method and a coating method as in the color forming layer 20.
The sealant layer 40 is not particularly limited, but a film made of a polyolefin resin, for example, a film of polyethylene resin (PE), polypropylene resin (PP), linear low density polyethylene resin (LLDPE), etc. is suitably used. it can.

  FIG. 4 is a cross-sectional view of another laminate 2 forming one embodiment of the packaging bag of the present invention. The laminate 2 is an embodiment in which the gas barrier layer 60 is provided between the substrate 10 and the sealant layer 40. Specifically, the laser coloring layer 20 is provided on the back surface side of the substrate 10, and the adhesive layer 50, the gas barrier layer 60, the adhesive layer 30, and the sealant layer 40 are sequentially laminated. It is needless to say that in the laminate 2 as in the example shown in FIG. 2, the color forming layer 20 may be provided only at the periphery of the fragile processing portion 70.

  In the laminate 2, the gas barrier layer 60 effectively prevents the gas such as oxygen from entering the inside of the packaging bag to oxidize and deteriorate the contents, or to volatilize the components of the contents to the outside of the packaging bag It is possible to improve the preservation of the contents. Although well-known gas barrier films, such as metal foils, such as aluminum foil, and a vapor deposition film of inorganic oxides, such as SiO, can be suitably applied as the gas barrier layer 60, it is not limited to this.

  FIG. 5 is a plan view illustrating the laminate forming the packaging bag of the present invention in a sheet-like state before forming the packaging into individual packaging bags, and the fragile processing portion 70 and the coloring portion 80 are such a sheet. It can be efficiently provided if it is provided in the form of a circle. In the laminate 100, the fragile processing portion 70 and the perforated color forming portion 80 are provided at a position slightly apart along the slit line 110 for slitting the laminate 100 according to the size of the packaging bag in the vertical direction. ing.

  This is slit at the position of the slit line 110, further slit according to the size of the width direction of the packaging bag, and sealed by the top seal portion 91, the bottom seal portion 92, and the back sticking seal portion 93 A packaging bag 90 shown in FIG. In the packaging bag 90, the fragile processing part 70 and the coloring part 80 are formed on the lower part along the top part sealing part 91 without displacing on the same line as the easy-cut line 3, the consumer opens the packaging bag 90 Since the position of the fragile processed portion 70 to be torn off can be easily visually observed by the color development of the color developing portion 80, the opening can be performed without taking much time.

  The present invention will be described in more detail by the following examples.

Example 1
(1) Laminate 1
Base material: PET sheet (12 μm in thickness)
Coloring layer: Coloring ink is prepared using ammonium molybdate as the coloring agent and polyurethane resin as the dispersing resin, and printed by gravure printing on a portion 10 mm away from the top seal portion of the substrate by gravure printing with a width of 3 mm. And
-Adhesive layer: Two-component curable urethane adhesive-Sealant layer: LLDPE film (thickness 40 μm)
It laminated | stacked one by one by the above structure, it bonded, and it was set as the laminated body 1. FIG.

(2) Fragile processing · A carbon dioxide gas laser (LP-430U manufactured by Panasonic SUNX, laser output 20%, processing speed, at a position 10 mm away from the portion corresponding to the top seal portion of the laminated body 1 described above. A weakly machined part and a perforated color part were formed at 200 m / min.

(3) Sealing the bag-bottom portion seal portion and the back-sticking seal portion, filling the contents from the top portion side, sealing the top portion seal portion to form a packaging bag.

(4) Evaluation / Cutability: Ease of tearing of a fragile processed part (easy ○: not easy but possible Δ: impossible ×) · Shift: amount of positional deviation between a fragile processed part and a colored part (measured value)
・ Visibility: Visibility of the colored part (clear ○: unclear but visible △: invisible ×)
We evaluated about item of. The results are summarized in Table 1.

Example 2
Except that the laminate is a laminate 2 provided with a gas barrier layer similar to that illustrated in FIG. 4, the same configuration as in Example 1 is carried out similarly, brittle processing and bagging are performed to form a packaging bag, Similar evaluations were made. The results are summarized in Table 1.

(1) Laminate 2
・ Gas barrier layer: Aluminum foil (thickness 7 μm)
The structure was the same as that of the laminate 1 except for the gas barrier layer.

Comparative Example 1
The laminate was the same as in Example 1 except that the following laminate 3 was used, and brittle processing and bag making were performed to form a packaging bag, and the same evaluation was performed. The results are summarized in Table 1.

(1) Laminate 3
Base material: oriented polypropylene (OPP) sheet (thickness 25 μm)
Except for the base material, the same configuration as the laminate 1 was sequentially laminated and bonded to obtain a laminate 3.

Comparative Example 2
The same packaging bag as Comparative Example 1 was formed except that brittle processing was performed by the following method, and the same evaluation was performed. The results are summarized in Table 1.

(1) YVO4 / fiber hybrid laser (MD-X1000 made by Keyence, laser output 20%, processing speed 200 m) at a position 10 mm away from the part corresponding to the top seal part of the fragile processing / laminated product 3 / Min) formed a weakly machined part and a perforated color part.

  As shown in Table 1, in Example 1 and Example 2, the cuttability, the shift, and the visibility were all good. On the other hand, in Comparative Example 1, the visibility was good, but since the base material can not be brittle-processed by the carbon dioxide gas laser, it can not be torn and can not be cut easily. Further, in Comparative Example 2, since the laser light source is not a carbon dioxide gas laser, although the color development of the color forming layer can be visually recognized, it is thin, and neither cutting nor tearing is possible, and the cutting property is poor.

1, 2, 100 ... laminate 3 ... easy cut line 10 ... substrate 20 ... color developing layer 30, 50 ... adhesive layer 40 ... sealant layer 60 ... gas barrier layer 70 ... fragile processing unit 80 ... coloring unit 90 ... packaging bag 91 ... top seal portion 92 ... bottom seal portion 93 ... back lined seal 110 ... slit portion 200, · · Laser light source 210 · · · carbon dioxide laser light

Claims (4)

  A packaging bag formed of a laminate having at least a substrate, a laser coloring layer containing an ink that develops a color by carbon dioxide laser irradiation, and a sealant layer, wherein the coloring part where the laser coloring layer made a color and the substrate are fragile. What is claimed is: 1. A packaging bag characterized in that an easy cut line is formed in which the fragile processing parts processed are overlapped on the same line.   The packaging bag according to claim 1, wherein the laser coloring layer is provided intermittently in a direction along the fragile processing portion.   The gas-barrier layer is provided in the said laminated body, The packaging bag of Claim 1 or Claim 2 characterized by the above-mentioned.   What is claimed is: 1. A method for producing a packaging bag comprising at least a substrate, a laser coloring layer containing an ink that develops a color by laser irradiation, and a sealant layer, the substrate and the laser coloring layer of the laminate. A laser-coloring portion where the laser-coloring layer is colored by irradiation with a carbon dioxide gas laser and a fragile processing portion where the substrate is fragile-processed are simultaneously provided on the same line, and the laser coloring portion and the fragile processing portion easily overlap A manufacturing method of a packaging bag characterized by forming a line.

Images