JPH1179167A - Carton blank and carton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carton and a carton blank for directly storing food content, which can be produced at low cost, do not have a bad effect on the environment, and are superior in safety and durability. SOLUTION: A carton blank 10 used for a carton for storing food content comprises a carton base paper 11, an ink layer 12 applied on one face of the carton base paper 11 and an oilproof coat layer 13 provided on the ink layer 12. The ink layer 12 is made of a coloring material for food. The oilproof coat layer 13 is formed preferably out of hydrophobic acrylic resin or polyester resin. Even when oil from food content touches the inside face of the carton, because of the oilproof coat layer 13, the ink of the ink layer 12 does not attach to the food content.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carton for directly storing food contents and a carton blank used for the carton.

[0002]

2. Description of the Related Art Hitherto, a box type carton for directly storing food contents has been known. A predetermined printed layer is formed on an inner surface portion of the carton that comes into direct contact with food, and a film-like coat layer is formed on the printed layer from the viewpoint of food safety. Ink is prevented from adhering to the food side.

As such a film-like coating layer, at present,
PVDC coatings are widely used.

[0004]

As described above, in a carton for directly storing food contents, a printed layer is formed on an inner surface portion of the carton directly contacting the food, and a PVDC coating is formed on the printed layer. A coat layer is formed.

[0005] Such PVDC coatings are very good in oil resistance and abrasion resistance, but have the drawback that coating processing costs are very high. Further, since the PVDC coating uses chlorine, there is also a problem that chlorine gas is generated when the used carton is incinerated, which adversely affects the environment.

[0006] For this reason, a low cost alternative to PVDC coating and a coating which does not adversely affect the environment is being developed, but a coating having oil resistance and abrasion resistance comparable to PVDC coating cannot be easily found.

Accordingly, the present inventors apply ink harmless to the human body on the inner surface of the carton, and apply oil resistant,
It was concluded that a carton for directly packing food could be produced without providing a PVDC coating by applying a coating having practically no problem with abrasion resistance.

The present invention has been made in view of such circumstances, and a carton and a carton which satisfy the conditions that can be manufactured at low cost and do not adversely affect the environment, and that are excellent in safety and durability. The purpose is to provide carton blanks.

[0009]

According to the first aspect of the present invention,
In a carton blank used for a carton for storing food contents, a carton base paper, an ink layer formed by applying an ink containing a food coloring material to one surface of the carton base paper, and an ink layer formed on the ink layer. A carton blank comprising an oil-resistant coating layer provided.

A second aspect of the present invention is the carton blank according to the first aspect, wherein the oil-resistant coating layer is formed of a hydrophobic acrylic resin or a polyester resin. .

According to a third aspect of the present invention, there is provided a carton for storing food contents formed by the carton blank according to any one of the first and second aspects, with the one surface facing the inside.

[0012] Food contents are stored in a carton assembled using the carton blank of the present invention.
An oil-resistant coating layer is provided on the ink layer to protect the ink layer, so that even if oil from food content comes into contact with the inner surface of the carton, the ink in the ink layer will adhere to the food content. There is no. In addition, since the ink layer formed on the inner surface of the carton is formed by applying an ink containing a food coloring material, even if the oil-resistant coating layer deteriorates, the ink of the ink layer adheres to the food contents. However, it does not harm the human body. Further, since the oil-resistant coating layer is formed of a hydrophobic acrylic resin or polyester resin, no chlorine gas is generated even when the carton is incinerated.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are diagrams showing an embodiment of the present invention.

First, a carton for storing food contents will be described with reference to FIG. As shown in FIG. 2, the carton 1 is composed of four side surfaces 3a, 3b, 3c, 3d, a bottom surface 4, and an upper surface 5, and food contents 2, for example, confectionery such as chocolate, biscuit, gum, etc. are directly inside. It is stored. Such a carton 1 is obtained by assembling the carton blank 10 shown in FIG. 1 into a box shape.

As shown in FIG. 1, the carton blank 10 includes a carton base paper 11 and one side 1 of the carton base paper 11.
1a and an oil-resistant coating layer 13 provided on the ink layer 12.

The ink layer 12 includes an ink containing a colorant, an ink carrier, and an ink solvent.
It is formed by coating on 1 by printing.
Hereinafter, the colorant, the ink carrier, and the ink solvent that form the ink layer 12 will be described in detail.

First, as a coloring agent, a coloring material for food which has no problem under the Food Sanitation Law (that is, a coloring material which meets the positive list) is used. Such food coloring materials are broadly classified into two types, natural pigments and food additives. From the viewpoint of coloring properties, it is preferable to use the following materials. That is, as a natural pigment, red beet, monascus, anthocyanin, gardenia, safflower, curcumin, annatto, flavonoid, gardenia blue, gardenia yellow, red bengal, and the like are preferably used. As food additives, it is preferable to use Edible Red No. 2, No. 40, No. 106, Edible Yellow No. 4, No. 5, Edible Blue No. 1, No. 2, No. 3, Edible Green No. 3, etc. .

As the ink carrier, food-grade shellac resin or acrylic resin is used. Further, as the ink solvent, water or an alcohol such as methanol, ethanol, isopropyl alcohol, or propylene glycol is used.

The oil-resistant coating layer 13 is made of MMA (acrylic resin having hydrophobicity) or polyester resin.

The other side 11b of the carton base paper 11
(Corresponding to the outer surface of the carton 1) is generally subjected to normal printing indicating the characteristics of the food contents 2.

Next, the operation of the present embodiment having such a configuration will be described.

First, a method for manufacturing a carton blank of the present invention will be described. The above-mentioned coloring material for food and the ink carrier are mixed at a predetermined ratio. Next, the mixed food coloring material and ink carrier are diluted with the ink solvent. The ink solvent is produced with water alone, alcohols alone, or a 1: 1 ratio of water to alcohols. As a result, the Zahn Cup No. At 3, an ink having a print viscosity of 15-35 sec is produced.

Next, the ink thus produced is applied to one side 11a of the carton base paper 11 by gravure printing, flexographic printing or roll coating, and then dried at 60 to 120 ° C. to form an ink layer 12 Is formed.

Next, on the ink layer 12, an oil-resistant coating agent in which the above-mentioned MMA or polyester resin is dispersed in water and isopropyl alcohol is generated.

Next, a predetermined amount of this oil-resistant coating agent is applied on the ink layer 12, and thereafter, at 100 to 120 ° C. × 15 to
It is dried under the condition of 35 sec. The applied oil-resistant coating agent is turned into a film by this drying, and the oil-resistant coating layer 13 is formed. The amount of the oil resistant coating agent applied is determined by the oil resistant coating layer 1
3 is adjusted to have a thickness of about 5 to 7 μm. Thus, the carton blank of the present invention is manufactured.

Next, the carton blank 10 thus obtained is assembled so that the surface on which the ink layer 12 and the oil-resistant coating layer 13 are formed is on the inside, and thus the carton blank 10 is shown in FIG. Such a carton 1 is obtained.

An insole (not shown) obtained by cutting the carton blank 10 may be arranged on the bottom surface 4 of the carton 1.

As shown in FIG. 2, the carton blank 10
The food contents 2, for example, confectionery such as chocolate, biscuit, gum, etc. are directly stored in the carton 1 assembled by the above method.

In this case, on the inner surface of the carton 1, an oil-resistant coat layer 13 having oil resistance
Is provided, and the ink layer 12 is protected by the oil-resistant coating layer 13, so that even if oil comes out of the food contents 2 and comes into contact with the inner surface of the carton 1, the oil-resistant coating layer 13 is deteriorated and the ink is deteriorated. The ink of the layer 12 does not adhere to the food contents 2.

Further, since the oil-resistant coating layer 13 is formed of a hydrophobic acrylic resin or polyester resin, the carton blank 10 and the carton 1 can be obtained at a lower cost than when a PVDC coating is applied. . Further, the oil-resistant coating layer 13 is formed by printing an oil-resistant coating agent mainly composed of a hydrophobic acrylic resin or a polyester-based resin, followed by drying to form a film. Since the oil-resistant coat layer 13 is also excellent in abrasion resistance, the oil-resistant coat layer 13 does not wear even if the food contents and the inner surface of the carton 1 rub during transportation of the carton 1.

Further, unlike the PVDC coating, the oil-resistant coating layer 13 made of a hydrophobic acrylic resin or polyester resin does not contain chlorine, so that no chlorine gas is generated when the carton is incinerated. Therefore, adverse effects on the environment can be reduced.

In the ink layer 12 located below the oil-resistant coat layer 13, a food coloring material is used as a coloring agent. For this reason, even if the oil-resistant coat layer 13 is deteriorated,
Even if the ink of the ink layer 12 oozes out on the surface of the oil-resistant coat layer 13, it does not harm the human body. Further, since the ink of the ink layer 12 is diluted with an ink solvent containing water as a main component at the time of printing, even if a residue of the ink solvent oozes out on the surface of the oil-resistant coat layer 13, it harms the human body. There is no possibility.

The oil resistance and abrasion resistance of the oil resistant coating layer 13 of the carton blank 10 of the present invention were tested, and the results are also shown.

First, an ink containing a food coloring material was applied on one surface of the carton base paper 11 by printing and dried to form an ink layer 12.

Next, an oil-resistant coating agent having the properties shown in Table 1 in which an acrylic resin was dispersed in water and isopropyl alcohol was applied on the ink layer 12. The application amount of the oil-resistant coating agent was set so that the film thickness of the oil-resistant coating layer 13 after drying was 5 μm or 7 μm. Next, under various conditions shown in Table 3, the test plate coated with the oil-resistant coating agent was dried to obtain each test plate (-) to be subjected to the present test.

The test plates obtained as described above were tested for oil resistance and abrasion resistance under the test conditions shown in Table 2. Table 3 shows the test results.

As shown in Table 3, each test plate (-) showed good oil resistance and abrasion resistance. That is, in the oil resistance test, bleeding of the ink component onto the oil resistance coating layer 13 was not observed, and the anti-abrasion test also showed
No peeling or abrasion of the oil-resistant coating layer 13 was observed.

[0038]

[Table 1]

[0039]

[Table 2]

[0040]

[Table 3]

[0041]

As described above, according to the present invention, the ink layer formed on the inner surface of the carton is formed by applying an ink containing a food coloring material, and the oil layer is coated on the ink layer. Since the layer is provided, the ink of the ink layer does not adhere to the food contents. Even if the oil-resistant coating layer deteriorates and the ink in the ink layer adheres to the food contents, it does not harm the human body. For this reason, a highly safe carton can be provided. When the oil-resistant coating layer is formed of a hydrophobic acrylic resin or a polyester resin, a carton blank and a carton can be manufactured at low cost. Furthermore, since chlorine gas is not generated even when the carton is incinerated, adverse effects on the environment can be reduced.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a carton blank of the present invention.

FIG. 2 is a view showing one embodiment of the carton of the present invention, showing a state in which food contents are stored.

[Explanation of symbols]

 1 Carton 2 Food contents 10 Carton blank 11 Carton base paper 12 Ink layer 13 Oil resistant coating layer

Claims (3)

[Claims] 1. A carton blank used for a carton for storing food contents, comprising: a carton base paper; and an ink layer formed by applying an ink containing a food coloring material to one surface of the carton base paper; A carton blank, comprising: an oil-resistant coat layer provided on the ink layer. 2. The carton blank according to claim 1, wherein said oil-resistant coating layer is formed of a hydrophobic acrylic resin or a polyester resin. 3. A carton for accommodating food contents formed by the carton blank according to claim 1 or 2, wherein said one surface is inside.