JP3911741B2 - Paper shading cup - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper light-shielding cup having a light-shielding property to which a metal detector for inspecting contamination of metal-based foreign matters in foods can be applied. Regarding the provision of cups.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a paper shading cup or container for preventing light deterioration of contents is known in which an aluminum foil or an aluminum layer is laminated on a cardboard base paper. In particular, as a paper shading cup, a typical example is an ice cream cup. By external light or fluorescent light in a display refrigeration case, the destruction and change of vitamins and milk components in the content ice cream, for example In many cases, a light-shielding layer made of aluminum foil or the like is used for the purpose of preventing discoloration or taste change of the green tea component.
[0003]
However, especially for contents such as liquid foods (beverages) and ice cream, metal detectors are often used as part of quality control to inspect contamination of metal chips, etc. A light shielding layer made of metal such as aluminum foil or aluminum deposit obstructs inspection and management by using a metal detector.
[0004]
In addition, paper shading cups and containers with light shielding properties such as aluminum foil and aluminum laminated layers are often incinerated as waste disposal after use. There is a problem that aluminum melted in the lattice) makes the movement of the rooster worse, lowers the combustion efficiency and damages the rooster, etc. Further, the aluminum is changed to alumina by incineration, and the incineration residue at the time of landfill disposal There is a problem that toxic ammonia gas adsorbed on alumina in the incineration residue is generated by humidification.
[0005]
Therefore, a black ink layer is considered as a non-metallic light-shielding layer instead of an aluminum foil or aluminum deposited layer, and the ink layer is covered with milk white polyethylene to conceal the black ink layer. Met.
However, when a cup is formed with a cup blank having such a structure, the black ink layer protrudes from the seam (end surface of the body part) of the inner surface of the cup and is unsightly and unsanitary. As described above, the black ink layer is made into a black ink printing pattern (20) having a non-printing portion (22) having a certain width along the edge of the cup blank (2), and the black ink printing pattern (20) is concealed. Therefore, as shown in FIG. 2 (b), a milk-white polyethylene has been proposed as the concealing layer (14a) (Japanese Patent Application No. 8-285348).
That is, the configuration of the cup blank (2) includes, as shown in FIG. 2 (b), a pattern printing layer (16) in which a pattern of a content, a food display, etc. are printed on the surface of a cardboard base paper (12) and its A transparent polyethylene layer (18) for protecting the pattern printing layer (16) and water resistance is applied, and a light-shielding layer (10) is provided on the back surface of the cardboard base paper (12) (the surface touching food on the inner surface of the cup). Of the black ink printing pattern and milky white polyethylene as a concealing layer (14a) for concealing the light shielding layer (10) thereon.
In addition, the milk-white polyethylene used here is what was used from the past although aluminum foil etc. were used for the light shielding layer from providing hygienic touch with concealment property provision.
[0006]
However, in the milk-white polyethylene as the concealing layer (14a), since the light shielding layer (10) is made of black ink, and the black ink printing pattern (20) is used, there is a difficulty in concealment. ), The contrast of the boundary between the non-printing part (22) and the black ink printing pattern (20) is conspicuous, looks bad, and gives a non-hygienic feel.
[0007]
[Problems to be solved by the invention]
The present invention solves such problems of the prior art, and the object of the present invention is to provide a light-shielding layer patterned with black ink on the inner side of at least a cardboard base paper and a light-shielding layer that do not include a metal layer. In a paper-made light-shielding cup formed by using a base paper for a light-shielding cup, which is formed by laminating a concealing layer for concealment in order, the contrast of the ink ink printing pattern boundary is particularly improved by making the masking layer on the inner surface of the cup thick. Is to provide a paper shading cup that is not noticeable, has a hygienic feel and has commercial value.
[0008]
[Means for Solving the Problems]
In order to achieve the above object in the present invention, a paper shading cup formed by using a base paper 2 for a shading cup composed of a multi-layer that does not include a metal layer, the cardboard at least inside the base paper 12 A light shielding layer 10 patterned with black ink set so as to provide a non-printing portion having a constant width from the edge of the base paper, and a shielding layer 14 for concealing the light shielding layer are sequentially applied, and the shielding layer 14 is a paper shading cup characterized in that it is made of thick paper having the same basis weight as the thick paper base paper.
[0009]
Here, the base paper for the light-shielding cup that does not include the metal layer of the present invention does not use an aluminum foil generally used for a paper light-shielding cup, and the synthetic resin film and paper on which aluminum is deposited are as described above. If it is a vapor deposition film thickness which does not affect a metal detector like this, it will be used as needed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
As shown in FIGS. 1A to 1B, the paper shading cup of the present invention does not include a metal layer, and at least the inner side of the cardboard base paper (12) has a constant width along the edge of the turn blank. Stacked in order of a black ink layer (10) having a black ink printing pattern (20) having a printing part (22) and a thick paper (14) for concealing the light shielding layer (10) through an adhesive layer (15) A light-shielding cup made of paper (1) formed using the base paper for a light-shielding cup,
[0011]
First, a black ink printing pattern (20) having a non-printing portion (22) with a constant width along the edge of the cup blank (2) will be described. When this printed pattern (20) is applied to the entire surface of the cup blank, the black ink protrudes from the joint end surface (30) and bottom end surface (32) of the inner surface of the paper shading cup (1), which is unsatisfactory in appearance and content. When the object is a food product, a black ink printing pattern (20) smaller than the cup blank is formed in order to prevent unsanitary items. The gravure printing method is used to form the printing pattern (20). preferable. Although the offset printing method and screen printing method are also possible, gravure printing is optimal because the cardboard base paper (12) of the cup is in the form of a roll in consideration of high productivity. This is also because a high light shielding property that cannot be obtained is obtained.
[0012]
The shape of the printed pattern (20) is smaller than the cup blank (2) as shown in FIG. 2 (a), and has a non-printing part (22) with a constant width along the edge of the cup blank (2). For example, in the case of a normal ice cream cup, the constant width is preferably about 2 mm to 5 mm.
Moreover, the thickness of the black ink printing pattern (20) is 1 μm to 3 μm. For example, the measurement result of the transmittance of the cup blank (2) having the black ink (10) layer of 3 μm is 1000 lux of natural light. It is about 0.02 below and about 0.03 under 5000 lux, and it has been demonstrated that sufficient light shielding properties can be obtained. Needless to say, it is preferable that the thickness of the black ink printing pattern (20) is thick, but there is a limit to the thickness that can be obtained by one-time printing by the gravure printing method, and the limit value is about 3 μm.
[0013]
As the gravure black ink, either organic solvent ink such as toluene or ethyl acetate or water-soluble ink can be used, but water-soluble black ink is preferable from the viewpoint of environmental conservation.
[0014]
Next, as the base paper (12), in a general size cup having an internal capacity of about 150 g depending on the size of the cup, a basis weight of 300 g / m ² is considered in consideration of easy molding of the cup and physical strength. A cup base paper of a degree is preferred. However, in the paper shading cup of the present invention, since the thick paper (14) is used for concealing the black ink printing pattern, the total thickness (basis weight) as the shading cup base paper (2) is easily molded. in view of the basis weight of paperboard sheet (12), and 150 g / m ² approximately cup base paper, cardboard for concealment (14) is also the same basis weight of the cup base paper.
[0015]
The adhesive layer (15) for adhering the cardboard base paper (12) and the cardboard (14) to the base paper for the light-shielding cup (2) of the present invention will be described.
Adhesives for paper-to-paper bonding, that is, interleaf paper, are generally natural product adhesives such as casein and gum arabic. Polyvinyl alcohol and isobutene-anhydrous maleic are synthetic water-soluble adhesives. Sun copolymer, polyacrylamide, and other emulsion adhesives such as styrene-n-butyl acrylate copolymer, maleic acid copolymer, polyvinyl methyl ether, n-butyl methacrylate, etc. can be used. Appropriate adhesive must be selected in consideration of the curl of the paper.
The above adhesive is water-soluble or dispersed in water, whereas an adhesive using an organic solvent as a solvent cannot be used because it dissolves black ink as a light shielding layer.
[0016]
Application of the adhesive is performed by gravure roll coating, reverse coating, bar coating, etc., because it is preferable that the base paper (12) and the thick paper (14) are wound (roll) in consideration of productivity. Since curling is a major problem in rewinding and drying the laminate of cardboard (12) and cardboard (14), it is necessary to cut the sheet into sheets after lamination or punch it as a cup blank. I do not get. However, since the cutting and punching are performed in a state where the adhesive is not solidified, it is difficult to manage cutting and select an adhesive that does not cause deviation from the adhesive layer (15).
[0017]
On the other hand, as another bonding method, a method by extrusion lamination of polyethylene can also be adopted. Specifically, a method of extruding molten polyethylene between a cardboard base paper (12) and a cardboard (14) and bonding them together is a perfect method from the viewpoint of high productivity for bonding a rolled material. It is also a method that solidifies immediately between the cooling rolls and is superior in the curl problem and the ease of management by cutting and punching.
[0018]
Next, as described above, the base paper (14) is preferably a cup base paper having a basis weight of 100 g / m ^{2 to} 200 g / m ^2, preferably about 150 g / m ^{2 in view} of cup moldability. Incidentally, the concealability of the cardboard (14), which is also the object of the present invention, was verified.
When the black ink printing pattern (20) was applied to the cardboard base paper (12), the reflection density of the black ink printing pattern (20) portion was 1.60, and the non-printing portion (22) was 0.06. Further, the reflection density of the base paper having a basis weight of 150 g / m ² bonded via polyethylene is 0.10 in the black ink printed pattern (20) portion and 0.06 in the non-printed portion (22). Thus, the black ink printed pattern (20) was a concealable cardboard (14) that was hardly noticeable.
For comparison, the reflection density of the black ink printed pattern (20) coated with 30 μm milk white polyethylene as the concealing layer (14a) is 1.10 in the black ink printed pattern (20) portion, and in the non-printed portion (22). The contrast of the black ink printing pattern (20) and the non-printing part (22) was too conspicuous.
[0019]
【Example】
Next, the present invention will be specifically described by way of examples.
<Example 1>
Cardboard base paper (12) ... Cup base paper pattern printed layer with a basis weight of 150 g / m ² (16) ... Clear PE layer by gravure printing method (18) ... 40 μm thick, extruded laminated light-shielding layer (10) ... Ink (New LP Super / Toyo Ink Manufacture)
Printed pattern ... Non-printing part (22) width 3mm, formed by gravure printing method to 3μm thickness Adhesive layer (15) ... Transparent polyethylene thickness 40μm, extruded laminated cardboard (14) ... basis weight 150g / M ² cup base paper [0020]
Under the above conditions, an ice cream cup having an internal volume of 120 ml was prepared.
The transmittance of the paper shading cup under the natural light 1000 lux for evaluating the shading property was 0.02, and the reflection density for evaluating the black ink concealment property was 0.60. That is, the light shielding properties against external light and fluorescent lamps in the refrigeration case were almost satisfactory values. The reflection density on the inner surface (inner side) of the cup is 0.10 for the black ink printed pattern area and 0.60 for the non-printed area, and the contrast between the black ink printed pattern area and the non-printed area is almost unnoticeable. There was something.
The metal detector was a non-reactive cup.
[0021]
【The invention's effect】
Since this invention is the above structure, there exist the following effects. That is, a paper-made light-shielding cup formed using a light-shielding cup base paper 2 composed of a multilayer that does not include a metal layer. In order, a patterned light-shielding layer 10 made of black ink set so as to be provided and a concealing layer 14 for concealing the light-shielding layer are applied, and the concealing layer 14 is made of thick paper having the same basis weight as the base paper. The paper shading cup is characterized by the fact that the ink-ink printing pattern, which is the shading layer, is hardly noticeable from the inner surface (inside) of the cup. To do.
[0022]
In addition, since the light-shielding layer does not contain a metal layer such as aluminum foil, it is possible to use a metal detector that controls the mixing of metal-based chips etc. into the contents. There is an effect of providing an environment-friendly paper shading cup that does not damage (grate) and does not generate harmful gas from incineration residue.
[Brief description of the drawings]
FIG. 1A is a perspective view showing an embodiment of the present invention.
(B) is a sectional side view showing an embodiment of the present invention.
FIG. 2 (a) is a developed view of a cup blank showing a conventional example and an embodiment of the present invention.
(B) is a sectional side view showing a conventional embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Paper shading cup 2 ... Base paper 10 for shading cups ... Light shielding layer 12 ... Thick paper base 14 ... Thick paper 14a ... Concealing layer 15 ... Adhesive layer 16 ... Pattern printing layer 18 ... Transparent PE layer 20 ... Black ink printing pattern 22 ... Non-printing part 30 ... Body end face 32 ... Bottom end face

Claims (1)

A paper-made light-shielding cup formed by using a light-shielding cup base paper 2 composed of a multilayer that does not include a metal layer, and a non-printing portion having a constant width from the edge of the base paper is provided at least inside the base paper 12 The light-shielding layer 10 patterned with black ink set in this way and the concealing layer 14 for concealing the light-shielding layer are sequentially applied, and the concealing layer 14 is made of cardboard having the same basis weight as the cardboard base paper. Paper shading cup characterized by.

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