JP4228766B2 - Vacuum packaging material and vacuum packaging bag using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a packaging material for packaging contents such as green tea, black tea or coffee, and more particularly to a vacuum packaging material for preventing oxidation of these contents and a vacuum packaging bag using the same.
[0002]
[Prior art]
Conventionally, vacuum packaging has been generally used to prevent oxidation of contents such as green tea, tea or coffee and to preserve for a long period of time. As this vacuum packaging material, a transparent substrate film printed on the back surface and an inner surface are used. In addition, a gas barrier base material (aluminum foil or the like) having a sealant layer is integrated (adhered).
[0003]
When a bag is formed using the vacuum packaging material having the above structure, the contents are filled, vacuum degassed and packaged, irregularities according to the contents appear on the surface of the package, and in particular, the printing surface is There was a problem that it became difficult to see due to the unevenness, and it became a product that did not look good in appearance.
[0004]
As a method for solving the above problems, for example, by covering the package once vacuum degassed with an exterior film (printed) created in a separate process, the unevenness can be made invisible. In the method, there is a problem in work efficiency and the like such as lack of a sense of unity with the package and an increase in the packaging process.
[0005]
Therefore, as a solution to the problem of unevenness on the surface of the vacuum packaging body and the problem that there is no sense of unity between the exterior film (printed) and the packaging body, An exterior material (30) made of cellophane (32) provided with a printed layer (34), and an interior material (40) having an outer surface that is not bonded to the exterior material (30) by heat sealing and an inner surface having heat sealing properties; A packaging material suitable for vacuum packaging in which the non-adhered portions other than the partial adhesive layer (43) are in communication with the outside. is there.
[0006]
Such a packaging material is made in a bag leaving an opening, filled with the contents from the opening, and then vacuum-suctioned and degassed from the opening. In (40), irregularities according to the contents appear, but the exterior material (30) becomes flat regardless of the irregularities of the interior material (40) because the outside air enters the unbonded part communicating with the outside. Therefore, there is a product that looks good in appearance (see, for example, Patent Document 1).
[0007]
[Patent Document 1]
Japanese Examined Patent Publication No. 7-22981 (first page to third page, FIG. 4)
[0008]
[Problems to be solved by the invention]
However, in the packaging material suitable for vacuum packaging in the above-described prior art, the printed layer surface of the exterior material and the interior material are integrated with a partial adhesive layer, and when it is wound up, even in an unbonded portion other than the partial adhesive layer There is a phenomenon that the printed layer surface of the exterior material and the unbonded portion of the exterior surface of the interior material are in close contact, and this phenomenon is due to the corona discharge treatment applied to the film constituting the exterior material and the entire surface of the film constituting the interior material. Furthermore, when a urethane type two-component reaction (curing) type ink suitable as an ink for a plastic film is used for this printing layer, the printing process and the bonding and integration process are performed in-line. It is easy to develop due to the reaction of the curing agent, etc., and due to this adhesion phenomenon, after making the packaging material and filling the contents, vacuum suction and deaeration to seal the opening tightly Irregularities corresponding to the contents of even outer package surface with interior material of the material appeared, appearance especially printed surface there is a problem that a product does not look nice.
[0009]
The present invention solves such problems of the prior art, and the problem is that the exterior material having the printed layer on the back surface and the interior material having the heat sealability on the inner surface are partially edged. In the vacuum packaging material bonded and integrated with the adhesive layer, even when the corona discharge treatment is performed at the time of forming the printed layer and the partial adhesive layer, and the urethane layer two-component ink is used for the printed layer, and Even if this printing process and adhesive integration process are done in-line, there is no phenomenon that the printed layer surface of the exterior material and the outer surface of the interior material are in close contact when vacuum packaging is performed using this vacuum packaging material. An object of the present invention is to provide a vacuum packaging material and a vacuum packaging bag using the vacuum packaging material that have an appearance that does not appear uneven on the surface of the exterior material when vacuum packaged using the packaging material.
[0010]
[Means for Solving the Problems]
In order to achieve the above object in the present invention, first, in the invention of claim 1, a printing substrate having a printed layer of urethane-based ink on the back surface, an outer surface not bonded to the printing substrate by heat sealing, and a heat seal A barrier substrate having an inner surface having a property, the printed layer surface of the printing substrate and the outer surface of the barrier substrate are opposed, and at least partial adhesive portions at both side edges are integrated by an adhesive for dry lamination , A vacuum packaging material in which an unbonded portion other than the partially bonded portion communicates with the outside, and a release varnish layer is applied to the unbonded portion other than the partially bonded portion. It is a material.
[0011]
According to the first aspect of the present invention, a printing substrate having a printed layer made of urethane-based ink on the back surface, a barrier substrate having an outer surface not bonded to the printing substrate by heat sealing and an inner surface having heat sealing properties; The printed layer surface of the printing substrate and the outer surface of the barrier substrate are opposed to each other, and at least the partially bonded portions on both side edges are integrated by an adhesive for dry lamination , and unbonded portions other than the partially bonded portions are a vacuum packaging material communicates with the outside, by applying a release varnish layer unbonded portion other than the partial bonding portion, even when the corona discharge treatment in the formation of the print layer and the partial adhesive layer In addition, even if urethane-based two-component curable ink is used for the printing layer and the printing process and the adhesive integration process are performed in-line, an adhesion phenomenon occurs in a part other than the partially bonded part. It can provide a vacuum packaging material in communication with the outside (outside air) not.
[0012]
Moreover, in invention of Claim 2, using the vacuum packaging material of the said Claim 1, the vacuum packaging bag by which the desired location of the inner surface which has the heat-sealing property of this vacuum packaging material was heat-sealed, and was bag-formed, It is a thing.
[0013]
According to the second aspect of the present invention, the vacuum packaging bag is formed by using a vacuum packaging material in which a release varnish layer is applied to a portion other than the partially bonded portion according to the first aspect. When the opening is hermetically sealed by vacuum suction and degassing from the opening of the packaging bag, the printed layer of the printing substrate and the outer surface of the barrier material are in close contact with each other in the non-bonded portion other than the partially bonded portion, that is, the peeled varnish layer. Since the outside air enters the unbonded part that is in communication with the outside, that is, the part of the release varnish layer, the surface of the printing substrate becomes flat regardless of the unevenness of the barrier material, and therefore the vacuum that looks good also in appearance It can be a packaging bag.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0015]
FIG. 1 is an explanatory view showing an example of the vacuum packaging material of the present invention, and FIGS. 2 and 3 are partially broken explanatory views showing another example of the vacuum packaging material of the present invention. 4 is a perspective view showing an example of a vacuum packaging bag using the vacuum packaging material of the present invention.
[0016]
The invention according to claim 1 is formed on the back surface as shown in, for example, a partially broken top view in FIG. 1A and a cross-sectional view in FIG. A printing substrate (10) made of a transparent plastic film on which a printing ink layer (12) made of a pattern printing layer (12a) and a white printing layer (12b) is applied, and a sealant layer (24) on the inner surface, The barrier base material (21) and the barrier material (20) composed of the barrier layer (22) are bonded and integrated by a spot-like partial adhesive layer (43) provided on the four-side edges of the barrier material (20). In the vacuum packaging material (1) in which the peeling varnish layer (45) is applied to a portion other than the partial adhesive layer (43), the peeling is an unbonded portion other than the partial adhesive layer (43). The varnish layer (45) is a vacuum packaging material (1) that communicates with the outside (outside air). That.
[0017]
In the above description (FIG. 1A), for the sake of convenience of explanation, a partial adhesive layer (43) and a release varnish layer (45) aligned with it are provided on the four side edges of the outer surface of the barrier material (20). In practice, however, a partial adhesive layer (43) and a release varnish layer (45) are applied in register with the pattern of the pattern print layer (12a), and FIG. The same applies to the case where a partial adhesive layer (43) is applied to the three-side edges shown, and it is generally provided on the surface of the printing ink layer (12) of the printing substrate (10).
[0018]
For example, as shown in the perspective view of FIG. 2, a partial adhesive layer (43) is applied only to the left and right side edges (20a) of the barrier material (20), and a release varnish layer (45) is applied to other portions. The printed substrate (10) that is bonded and integrated with the pattern printing layer (12a) may have an advantage that there is no need to register in the vertical direction. However, a partial adhesive layer (43) may be applied to the left and right edges (20a) of the printing ink layer (12) surface of the printing substrate (10).
[0019]
Furthermore, as shown in FIG. 2, for example, a peeling varnish layer (45) applied to an unbonded portion other than the partial adhesive layer (43) applied only to the left and right side edges (20a) of the barrier material (20) is provided. The gap (45a) may be left around the partial adhesive layer (43), thereby making it easy to register with the partial adhesive layer (43). As shown in a), the registration with the partial adhesive layer (43) may not be provided by tapping, and the initial purpose is achieved if the release varnish layer (45) communicates with the outside (outside air). be able to.
[0020]
For example, as shown in FIG. 3, the partial adhesive layer (43) is provided on three sides of the left and right side edges (20a) and the lower edge (20b), or on both sides of the left and right edges and the upper edge (not shown), A release varnish layer (45) can also be provided in an unbonded portion other than the partial adhesive layer (43), and a part of the four-sided edge shown in FIG. Similar to the case where the adhesive layer (43) is provided, there is a need to register the upper and lower sides with the pattern printing layer. However, when the bag is heat-sealed from the vacuum packaging material (1), or the contents In the case of hermetic sealing after filling, wrinkles and the like are unlikely to occur.
[0021]
Furthermore, as shown in FIG. 3, for example, a peeling varnish layer (45) to be applied to an unbonded portion other than the partial adhesive layer (43) to be applied to the three-way end edges (20a, 20b) of the barrier material (20) is provided. The gap (45a) may be left around the partial adhesive layer (43), thereby making it easy to register with the partial adhesive layer (43). As shown in a), the registration with the partial adhesive layer (43) may not be provided by tapping, and the initial purpose is achieved if the release varnish layer (45) communicates with the outside (outside air). be able to.
[0022]
As described above, according to the first aspect of the present invention, by applying the release varnish layer (45) to the non-adhered portion other than the spot-like partial adhesive layer (43), the printing ink layer (12) Even when the corona discharge treatment is performed at the time of forming and forming the partial adhesive layer ( 43 ), a urethane-based two-component curable ink is used for the printing ink layer (12), and this printing step and the adhesive integration step are performed. Even when performed in-line, the printing ink layer (12) and the outer surface of the barrier material (20) do not adhere to each other except the partial adhesive layer (43). As a result, the release varnish layer (45) is formed. A vacuum packaging material (1) communicating with the outside (outside air) can be obtained.
[0023]
The invention according to claim 2 includes a printing substrate (10) having a printing ink layer (12) on the back surface as shown in FIGS. 1 (a) and 1 (b), and a sealant layer ( 24) is bonded and integrated with a spot-like partial adhesive layer (43) provided on the four-side edges between the barrier material (20) having a non-adhered portion other than the partial adhesive layer (43). For example, as shown in the perspective view of FIG. 4, the left and right side edges (20a) are formed using a vacuum packaging material (1) applied so that the release varnish layer (45) communicates with the outside (outside air). The inner surface (sealant layer (not shown)) and the inner sealant layers of the lower end edge (20b) are bonded together by heat sealing, and the upper end edge (20c) is not sealed to form the opening (50). The gusset type vacuum packaging bag (2)
[0024]
The vacuum packaging bag (2) bonded with the sealant layer on the inner surface of each edge as described above has each edge, that is, both the left and right side edges (20a), the lower edge (20b), and the opening (50). Since the peeling varnish layer (45) prevents the printing ink layer and the barrier material from sticking to each other at the formed upper edge (20c), it comes into communication with the outside (outside air).
[0025]
Contents such as green tea and coffee are filled from the opening (50) of the vacuum packaging bag (2) as described above, and vacuum suction and deaeration is performed. For example, as shown in the perspective view of FIG. When the upper end edge (20c) is heat-sealed and sealed and sealed, a barrier material (not shown) on the inner surface forms irregularities according to the contents, and a partial adhesive layer (43 The printed substrate (10) of the outer surface which is bonded and integrated with the inner surface is not bonded inside through the peeling varnish layer (45) of the left and right side edges (20a), the lower edge (20b) and the upper edge (20c). Since the outside air enters the partial peeling varnish layer (45), unevenness is not formed.
[0026]
Accordingly, it is possible to provide a vacuum packaged product that has a flat surface in appearance, and in particular, the pattern printed layer (12a) viewed from the surface can be seen as a normal pattern printed product and has a good commercial value.
[0027]
The material etc. which comprise the vacuum packaging material (1) and vacuum packaging bag (2) of this invention below are demonstrated.
[0028]
First, as a peeling varnish layer (45) provided between the printing substrate (10) and the barrier material (20) in an unbonded portion other than the partial adhesive layer (43), for example, a nitrified cotton-based (nitrocellulose) resin , Polyamide resins, polyester resins and the like are mixed with waxes to adjust the easy peelability. Examples of the waxes include polyethylene waxes and polyester waxes. It only needs to be compatible with the resin, and spot-like partial adhesion by pattern coating by the gravure printing method or flexographic printing method that supplies ink to the plate via an anilox roll with ink (varnish) made of these easily peelable resins, etc. The release varnish layer (45) can be formed in register with the layer (43).
[0029]
Further, as the printing substrate (10) constituting the vacuum packaging material (1) of the present invention, for example, a polyethylene terephthalate film having a thickness of about 20 μm, a uniaxial or biaxially stretched polyamide (nylon) film, or a stretched polypropylene film is used. And is appropriately selected depending on the application.
[0030]
The pattern printing layer (12a) and the white printing layer (12b) applied to the back surface of the printing substrate (10) are generally formed by a gravure printing method, and the ink is the plastic film. Urethane-based two-part curable gravure ink is suitably used because of its printability (adhesion (adhesion) property, drying property, film property, gloss, resolution such as dot gain, etc.) to the printing substrate (10). The In this printing, a corona discharge treatment is generally performed to improve the adhesion to the plastic film.
[0031]
Moreover, as a spot-like partial adhesion layer (43), the kind of the adhesive is formed in a pattern , and furthermore, the film is required to have air permeability for transpiration by bonding and bonding the films together. For example, a dry lamination adhesive is preferably used, and a one-component or two-component reaction type polyurethane resin is used. This urethane base polymer is an ester or ether polyol, and its adhesive form includes a solvent type, a solventless type, an aqueous type, and an alcohol type. These dry lamination adhesives can be formed into a spot-like partial adhesive layer (43) by a gravure printing method or a flexographic printing method using an anilox roll. In forming the partial adhesive layer (43), a corona discharge treatment is generally performed in order to improve the adhesion to the plastic film as in the formation of the printing ink layer.
[0032]
Examples of the barrier substrate (21) constituting the barrier material (20) include a polyethylene terephthalate film having a thickness of about 12 μm, a uniaxial or biaxially stretched polyamide (nylon) film, or a stretched polypropylene film. As the layer (22), an aluminum foil having a thickness of about 10 μm is laminated on the barrier base material (20) via an adhesive for dry lamination, or aluminum is deposited on the barrier base material (20). A film may be provided. Furthermore, it is possible to form a transparent barrier material by depositing silicon oxide or alumina on the barrier base material (21), but the contents are light shielding properties in addition to gas (oxygen, water vapor) barrier properties such as green tea. The above-described aluminum foil or aluminum vapor deposition is suitable as the barrier layer (22).
[0033]
Furthermore, as the sealant layer (24) applied to the inner surface of the barrier material (20), for example, a linear low density polyethylene film, a low density polyethylene film, a high density polyethylene film or an unstretched polypropylene having a thickness of about 40 μm. Films, ethylene / vinyl acetate copolymer films, ionomer films, etc., obtained by laminating them via an adhesive for dry lamination or sand polyethylene, or melted linear low density polyethylene resin and the above sealant resin Can be obtained by an extrusion laminating method in which they are bonded together while being extruded through an anchor coating agent.
[0034]
【The invention's effect】
Since this invention is the above structure, there exist the following effects.
That is, in the invention according to claim 1, a barrier substrate having a printing substrate having a printed layer of urethane-based ink on the back surface, an outer surface not bonded to the printing substrate by heat sealing, and an inner surface having heat sealing properties The printed layer surface of the printing substrate and the outer surface of the barrier substrate are opposed to each other, and at least the partially bonded portions on both side edges are integrated by an adhesive for dry lamination , and the unbonded portion other than the partially bonded portion If there a vacuum packaging material communicates with the outside, by applying a release varnish layer unbonded portion other than the partial adhesion portion, which is corona discharge treated during the formation of the print layer and the partial adhesive layer However, even if urethane-based two-component curable ink is used for the printing layer and the printing process and the adhesive integration process are performed inline, the printed layer is in close contact with the part other than the partially bonded part. There is an effect capable of providing a vacuum packaging material in communication with the outside (outside air) without causing an elephant.
[0035]
Further, in the invention according to claim 2, a vacuum packaging bag made by using a vacuum packaging material in which a peeling varnish layer is applied to a portion other than the partially bonded portion according to the invention according to claim 1 is used. Thus, when the opening is hermetically sealed by vacuum suction and degassing from the opening of the vacuum packaging bag, the printed layer of the printing substrate and the outer surface of the barrier material in the non-bonded portion other than the partially bonded portion, that is, the peeled varnish layer portion Since the outside air enters the unbonded part that is in communication with the outside (outside air), that is, the part of the release varnish layer, even if irregularities corresponding to the contents appear in the barrier material, regardless of the irregularities There is an effect that the surface of the printing base material becomes flat, and thus a vacuum packaging bag having a good appearance can be obtained.
[0036]
Therefore, the present invention is a packaging material for wrapping contents such as green tea, black tea or coffee, and in particular, as a vacuum packaging material for preventing oxidation of these contents and a vacuum packaging bag using the same. Demonstrate the effect.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a vacuum packaging material of the present invention,
(A) is the fracture | rupture top view,
(B) is BB surface sectional drawing of (a).
FIG. 2 is a cutaway perspective view for explaining another embodiment of the vacuum packaging material of the present invention.
FIG. 3 is a cutaway perspective view for explaining still another embodiment of the vacuum packaging material of the present invention.
FIG. 4 is a perspective view for explaining an embodiment of a vacuum packaging bag using the vacuum packaging material of the present invention.
FIG. 5 is a perspective view showing an example in which contents are filled in a vacuum packaging bag using the vacuum packaging material of the present invention.
FIG. 6 is a perspective view showing an example of a packaging material suitable for conventional vacuum packaging.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Vacuum packaging material 2 ... Vacuum packaging bag 10 ... Printing base material 12 ... Printing ink layer 12a ... Pattern printing layer 12b ... White printing layer 20 ... Barrier material 20a ... Edge both sides 20b ... Lower edge 20c Upper edge 21 Barrier substrate 22 Barrier layer 24 Sealant layer 30 Exterior material 32 Cellophane 34 Printing layer 40 Interior material 43 Partially adhesive layer 45 ... peeling varnish layer 45a ... gap 50 ... opening

Claims (2)

A printing substrate having a printing layer made of urethane-based ink on the back surface, a barrier substrate having an outer surface not bonded to the printing substrate by heat sealing and an inner surface having heat sealing properties, and the printing layer surface of the printing substrate and the barrier A vacuum packaging material in which the outer surface of the base material is opposed and at least the partially bonded portions at both side edges are integrated by an adhesive for dry lamination , and the unbonded portions other than the partially bonded portions communicate with the outside. there are, vacuum packaging material characterized in that peeling varnish layer is applied to the unbonded portion other than the partial adhesive portion. A vacuum packaging bag produced by using the vacuum packaging material according to claim 1 and heat-sealing a desired portion of the inner surface having heat sealability of the vacuum packaging material.

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