JPH07223627A - Blank for paper container and the same paper container - Google Patents

Abstract

PURPOSE:To form a container with folds made securely along rules by limiting a score ratio of lateral rules of a blank for a container made of a laminated material comprising plastic films and paper within a specific range. CONSTITUTION:A laminated material comprising an intermediate layer made of plastic films and paper, and at least one or more thermoplastic resin layers provided on both faces of the intermediate layer is punched into a blank shape, wherein the laminated material comprises, for example, a polyethylene layer 10, a paper layer 11, a polyethylene layer 12, a polyethylene layer 13, a polyethylene terephthalate layer 14, a silicon oxide deposited layer 15 and a polyethylene layer 16 from outside. Rules where a score ratio of lateral rules is in a range of less than 0.8 to 0.6 or more are provided, and this blank for paper container is folded along the rules to assemble a paper container. Thus gas barrier property does not drop without using aluminum foils or the like, and if the container is incinerated after use, no metal bulk may remain, thereby improving environmental problems.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper container used as a container for containing a liquid such as juice, liquor or petroleum, and also relates to a blank for molding the paper container. is there.

[0002]

2. Description of the Related Art Conventionally, a paper container bent and formed by a ruled line has an intermediate layer composed of a paper layer as a base material, and an intermediate layer of this intermediate layer, depending on the nature of the contents stored in the container and the storage condition. A laminated material in which a heat-adhesive resin layer such as polyethylene is provided on both surfaces is used. Then, this laminated material is punched into a predetermined shape according to the shape of the container, and is molded as a blank with a ruled line for folding, and the blank is bent along the ruled line and molded as an assembled paper container. ing. Since the paper container can be easily folded after the contents are used and can be incinerated, it is used in a wider range than ever before.

A paper container is a laminate in which a metal foil such as an aluminum foil having a gas barrier property is used as an intermediate layer having a paper layer as a base material according to various conditions such as contents, storage condition, storage period and the like. Sometimes used material.

[Problems to be Solved by the Invention]

It is true that the paper container can be easily folded after the contents are used and can be incinerated so that it can be easily discarded. However, the paper container has a layer including a metal foil such as an aluminum foil for protecting the contents. In the case of using the laminated material of No. 3, when the contents were discarded after use and incinerated, the above metal remained as a lump to damage the incinerator in some cases.

On the other hand, if a metal foil such as an aluminum foil is removed, the gas barrier property deteriorates and the storability of the contents deteriorates, making it impossible to use the paper container in a wide range of applications.

However, instead of the laminated material used for the paper container, a metal foil such as an aluminum foil is used, and a blank made of a laminated material in which a plastic film for maintaining the gas barrier property is also interposed is used. Similarly, when a container is molded in the same manner, it is difficult to fold and assemble the creases because the metal foil with good formability and shape retention is not provided, and especially the creases at the top of the container are not reliably formed. .

The present invention has been made in order to solve the above-mentioned problems, and does not reduce the gas barrier property with a structure not using a metal foil such as an aluminum foil or the like, is compatible with environmental problems, and has good moldability. A blank for a paper container and a paper container molded from the blank are provided.

[0008]

According to the present invention, an intermediate layer comprises a plastic film and a paper layer, and at least one or more thermoplastic resin layers are provided on both sides of the intermediate layer. In the provided blanks, a blank for a paper container, characterized in that a ruled line having a score ratio of horizontal ruled lines in the range of less than 0.8 and 0.6 or more is provided,
It is a paper container obtained by assembling and molding the blank for a paper container along a ruled line.

Further, as the above intermediate layer, polyethylene terephthalate, ethylene-vinyl alcohol copolymer,
A blank for a paper container characterized by using a stretched plastic film of nylon or polypropylene as an intermediate layer plastic film, and a paper container in which the blank for a paper container is bent and assembled along a ruled line. .

A blank for a container made of paper, characterized in that a vapor-deposited layer of an inorganic compound composed of silicon oxide, aluminum oxide, magnesium oxide or the like is provided on at least one surface of the above-mentioned intermediate plastic film, and a blank made of this paper. It is a paper container in which container blanks are assembled and formed along a ruled line. In particular, it is preferable to use silicon oxide as the inorganic compound because it has excellent gas barrier properties.

Further, the score ratio is a ratio of bending loads in which the blanks having no ruled lines are bent at 90 ° and an auxiliary line for bending the ruled lines is provided, and when the blanks are bent at 90 °. Is a value indicating.

Here, the score ratio of the vertical ruled lines is not shown, since the vertical ruled lines are provided in the fiber flow direction of the paper layer, the score ratio is large even if the structure of the laminated material or the shape of the ruled lines is changed. This is because no change will occur. On the other hand, the score ratio of the horizontal ruled line is shown because the horizontal ruled line is bent from the ruled line part provided at right angles to the fiber flow direction of the paper layer, so it is affected by the composition of the laminated material and the shape of the ruled line. It is to receive.

[0013]

As described above, by setting the score ratio of the horizontal ruled lines inserted in the direction perpendicular to the flow direction of the fibers of the paper layer which is the base material of the intermediate layer to less than 0.8 and 0.6 or more, the aluminum foil is obtained. Even if it is a laminated material that does not use a metal foil such as
Blanks can be bent along the ruled line,
The container can be assembled and the top of the container can also be bent according to shape.

Further, even if the laminated material does not use a metal foil such as an aluminum foil for the intermediate layer, it is one of the intermediate layers of the laminated material.
By using as a layer, polyester, ethylene-
A container having a gas barrier property can be obtained by using either a vinyl alcohol copolymer, nylon, or a stretched plastic film such as polypropylene. Furthermore, by using a stretched plastic film provided with a vapor deposition layer of an inorganic compound, a container having more excellent gas barrier properties can be obtained.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, the laminated material used in this embodiment is a polyethylene layer 10 and a paper layer 1 from the outside.
1, polyethylene layer 12, polyethylene layer 13, polyethylene terephthalate layer 14, silicon oxide vapor deposition layer 15,
A laminated material including the polyethylene layer 16 is used. The thickness of each layer is 25 μm for the polyethylene layer 10, 400 g / m ^{2 for the} paper layer 11, 40 μm for the polyethylene layer 12, 15 μm for the polyethylene layer 13, 12 μm for the polyethylene terephthalate layer, and 1600 for the silicon oxide vapor deposition layer 15.
Å The polyethylene layer is 60 μm. The above laminated material is punched into a blank shape shown in FIG. 2 to provide horizontal ruled lines and vertical ruled lines. Next, the folded blanks are assembled along the horizontal ruled lines and the vertical ruled lines.

By using the above laminated material and changing the ruled line width (W ₁ ), the groove width (W ₂ ), the ruled line height (h) and the ruled line shape by using a molding apparatus as shown in FIG. The moldability was confirmed by changing the score ratio. The results are shown in Table 1.

[0018]

[Table 1]

From Table 1, the blanks of constitution 3, constitution 4 and constitution 5 had good moldability. These configurations are blanks in which the score ratio of the horizontal ruled lines is in the range of less than 0.8 and 0.6 or more, and the opening torque for forming from the folded state can be opened with less than 1000 g, so that it is defective at the time of opening. Almost no opening occurs. In addition, since the top of the assembled container is also bent like a ruled line, no folding failure was found in the molding.

By providing the ruled line by changing at least one of the groove width of the face plate, the width of the ruled line blade, the height of the face plate, and the shape of the ruled line blade, the width of the ruled line, the height of the ruled line, the ruled line The shape changes and the score ratio changes.

Further, the container formed by the blanks shown in FIG. 1 has a roof-shaped top part, but the tops of the blanks and the container after the molding are flat molds, and the same good molding is achieved. Have sex.

[0022]

As described above, according to the present invention, by setting the score ratio of the horizontal ruled line of the blank of the paper container made of the laminated material provided with the plastic film to less than 0.8 and 0.6 or more, Make sure to bend the container along the ruled line,
Can be assembled.

The gas barrier property can also be improved by the plastic film provided in the intermediate layer, and the application of the paper container can be further expanded. Furthermore, even if the container is incinerated after the content is used, no metal lump remains, and environmental problems can be improved.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a laminated material of an example used as a blank of a container of the present invention.

FIG. 2 is a plan view of a blank obtained by punching the laminated material shown in FIG. 1 into a predetermined shape.

FIG. 3 is an explanatory view showing one means for forming ruled lines on blanks.

[Explanation of symbols] 10, 12, 13, 14, 16 ... Polyethylene layer 11 ... Paper layer 14 ... Polyethylene terephthalate layer 15 ... Vapor deposition layer

Claims (4)

[Claims] 1. A score of a horizontal ruled line in a blank having punched ruled lines made of a laminated material in which an intermediate layer is composed of a plastic film and a paper layer, and at least one thermoplastic resin layer is provided on both sides of the intermediate layer. A blank for a paper container, characterized in that a ruled line having a ratio of less than 0.8 and not less than 0.6 is provided. 2. Polyethylene terephthalate, ethylene-
A blank for a paper container, wherein a stretched plastic film of vinyl alcohol copolymer, nylon or polypropylene is used as an intermediate layer plastic film. 3. The blank for a paper container according to claim 1 or 2, wherein a vapor deposition layer of an inorganic compound is provided on at least one surface of the intermediate layer plastic film. 4. A paper container obtained by bending and assembling the paper container blanks according to claim 1 along a ruled line.