JP2003276725A - Paper container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper container consisting of a laminate mainly composed of paper and having recesses and protrusions which are molded deep or high at an acute angle at a part of the outer surface of the container for the improvement or the like of non-slip properties and a design effect. <P>SOLUTION: The angularly cylindrical paper container having four side surfaces consists of a laminate mainly composed of paper. The weighing of the paper is 50-450 g/m<SP>2</SP>, and the elongation at breakage thereof is 10% or more both longitudially and laterally under the environment of 65% humidity. The laminate is provided with an inner layer having at least a thermally adherent resin layer on one of the faces of the paper and an outer layer having at least a thermally adherent resin layer on the other face thereof. Further, recesses and protrusions are provided at a part of the paper container. The recesses and protrusions can be provided on a pair of side surfaces opposed to each other. Furthermore, the recesses and protrusions are provided at a part of the body of the container or at a part of the bottom face thereof. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper container for containing liquids, powders, granules and the like, and more specifically, an uneven portion is provided for preventing slippage and improving design. It relates to a paper container.

[0002]

2. Description of the Related Art Heretofore, as a container for containing a liquid or the like, a paper container which is formed in a rectangular cylindrical carton by using a laminated body mainly composed of paper has been widely known. This paper container is provided with a spout at the top, and when used, it is held in one hand and the contents are poured out from the spout. The shape is Gobel top (roof) type, brick (brick) type,
There is a triangular pyramid type. In many cases, each shape is provided with a spout for pouring out the contents. As the spout, (1) apply a heat-resistant adhesive to the top heat-bonding part to form the top heat-bonding part. What makes the opening easy by opening and makes the spout by opening the heat bonding part at the top, (2) Attaching the spout made of a plastic molded product and making the spout the spout, (3) Paper It is common to make a hole in the container, close the hole again with a sealing sheet, and peel off or pierce the sealing sheet to form a spout.

When a paper container filled with the contents, especially a paper container having an internal capacity of 500 ml or more is held by hand, there is a problem that the paper container filled with the contents is heavy and slippery. In order to solve this problem, it has been proposed to attach a non-slip seal or the like to the side surface of the paper container, or to provide an uneven portion by embossing.

[0004]

However, the former application of the non-slip seal requires a different material, resulting in a higher processing cost. In addition, the latter method of providing an uneven portion by embossing to improve the slip resistance on a part of the outer surface is a conventional laminated body mainly made of paper, so that the elongation at break of the paper is low and the slip is sufficient. There is a limit to providing an uneven portion having a height or a depth at a steep angle effective for stopping. That is, since the paper has a small elongation, it can be formed into a low or shallow uneven shape, but when it is formed into a high uneven shape at a steep angle or a deep uneven shape, there is a problem that cracks easily occur.
Therefore, there is a demand for paper as a material capable of providing an uneven portion having a height or a depth at a steep angle for a sufficient anti-slip effect or improvement in designability in a paper container.

The present invention is a paper container composed of a laminated body mainly composed of paper, and has high and deep uneven portions formed at a steep angle on a part of its outer surface in order to prevent slippage and improve design. It is intended to provide a paper container.

[0006]

As a result of studies to solve the above problems, the present invention provides a rectangular tube-shaped paper container having four side surfaces composed of a laminated body mainly composed of paper. A paper container having a basis weight of 50 to 450 g / m ² and a breaking elongation of 10% or more in a longitudinal direction and 10% or more in a lateral direction under an environment of a humidity of 65%. The laminated body has an inner layer having at least a heat-adhesive resin layer on one surface of the paper and an outer layer having at least a heat-adhesive resin layer on the other surface. Further, it is characterized in that an uneven portion is provided on a part of the paper container. And the said uneven | corrugated | grooved part can be provided in a pair of said side surface which opposes.

According to the present invention, there is provided a paper container composed of a laminated body composed mainly of paper, and the basis weight of the paper is 50 to 450 g.
/ M ² and the breaking elongation in an environment of a humidity of 65% is 10% or more in the longitudinal direction and 10% or more in the lateral direction, so that a part of the outer surface has a high or deep uneven portion at a steep angle. It is possible to obtain a paper container that can be molded and has effects such as non-slip and improved design.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the paper container of the present invention will be described below in more detail with reference to the drawings. Note that, for simplification of description, the same reference numerals are given to corresponding parts in each drawing.

FIG. 1 is a perspective view showing an example of the first embodiment of the paper container according to the present invention. This paper container A1
Is provided with a convex portion X1 on the outer surface of the side surface 12. The convex portion X1 is for enhancing the design of the paper container A1.
The position to be provided may be any position on the outer circumference of the paper container A,
Moreover, you may provide in multiple places. Further, although the shape of the convex portion X1 is a shape according to the printed pattern in this embodiment, it is not particularly limited to a geometric shape such as a circle, a quadrangle, or a polygon.

FIG. 2 is a perspective view showing an example of the second embodiment of the paper container according to the present invention. Paper container A2 is
A concave portion X is formed in a horizontal line on the upper side of the pair of opposing side surfaces 11 and 13.
2 is provided. The recess X2 has an anti-slip effect and is provided to make it easy to hold the paper container A2 containing the contents by hand. The position to be provided is the upper part of the pair of side faces 11 and 13 facing each other, and is the position of the finger holding the paper container A2 for pouring out the contents from the pouring port. The number of the recesses X2 may be one or more, and in the present embodiment, the recess X2 has a continuous linear shape, but may have a discontinuous shape or the like.

The material used for the paper container A (A1, A2) of the present invention is a laminated body composed mainly of paper, and the inner layer having at least a heat-adhesive resin layer on one side of the paper and the other layer on the other side. It is basically provided with an outer layer having at least a heat-adhesive resin layer on its surface. Then, a barrier layer may be laminated between the paper and the heat-adhesive resin layer.

In particular, in the paper container A of the present invention, the material used is a material that is easily deformed when forming the uneven portions X (X1, X2) and does not cause cracks or pinholes. I am trying. That is, the basis weight is 50
A laminated body composed mainly of paper having a breaking elongation of 10% or more in the longitudinal direction and 10% or more in the lateral direction in an environment of ~ 450 g / m ² and a humidity of 65% is used. The basis weight is preferably in the range of 50 to 300 g / m ² because it is easy to mold, although it varies depending on the container shape. Further, it is preferable to use a laminated body mainly composed of paper having a breaking elongation of 15% or more in the longitudinal direction and 15% or more in the lateral direction in an environment of a humidity of 65%.
By forming a laminated body mainly composed of paper under these conditions, the concavo-convex portion X can be easily formed into a concavo-convex shape having a high steep angle or a deep concavo-convex shape by a press molding machine composed of a male mold and a female mold. It is possible to obtain the paper container A having the uneven portion X without wrinkles and cracks. If the basis weight of this paper is less than 50 g / m ² , the rigidity is insufficient and pinholes are easily generated, which is not preferable. Further, if the basis weight of this paper exceeds 450 g / m ² , the molding load of the press molding machine becomes large, which is not preferable. Further, when the elongation at break is less than 10% in the longitudinal direction and less than 10% in the lateral direction, not only the uneven portion X cannot be formed at a steep angle at a high angle or deeply, but also defects such as cracks occur during molding. , Not preferable.

Further, the thermoplastic resin used for the inner and outer layers of the laminate has a function of protecting the contents, in particular, having a function of preventing leakage even when a liquid substance is put therein, and making it possible to assemble a laminated paper container by heat sealing. Must have the ability to Specifically, for example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (linear) low-density polyethylene, ethylene-α-olefin copolymer polymerized using a metallocene catalyst, polypropylene,
Ethylene-vinyl acetate copolymer, ionomer-resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer Polymer, methylpentene polymer, polybutene polymer, polyolefin resin such as polyethylene or polypropylene modified with unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid Acid-modified polyolefin resin,
Polyvinyl acetate resin, poly (meth) acrylic resin,
Resins such as polyvinyl chloride resin, polyester resin and nylon resin can be used. Among them, the ethylene-α-olefin copolymer polymerized using a metallocene catalyst has elasticity, and when molding the uneven portion,
Since cracks and pinholes hardly occur, it can be used favorably. The above-mentioned adhesive resin layer is used, and as the above-mentioned thermoplastic resin layer, for example, an extruder is used, and one or more kinds of the above-mentioned resins are provided between the paper and the barrier layer. Is extruded into a single layer or a multi-layer to form a melt-extruded resin film or the like, and through the melt-extruded resin layer,
The above paper and the barrier layer can be laminated. In the present invention, the film thickness of the adhesive resin layer is about 20 μm to 200 μm, preferably 2 μm.
About 5 to 100 μm is desirable. In the above, if the film thickness is less than 25 μm, it is not preferable since the roasting pinhole tends to occur.
When the film thickness exceeds 200 μm, the moldability of the bottom portion and the top portion is extremely deteriorated, which is not preferable.

The barrier layer constituting the paper container of the present invention has excellent mechanical, physical, chemical, and other properties, and particularly has strength and toughness and heat resistance. It is possible to use a resin film or sheet having Specifically, for example, polypropylene resin, cyclic polyolefin resin, fluorine resin,
Polystyrene resin, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-
Styrene copolymer (ABS resin), polyvinyl chloride resin, fluorine resin, poly (meth) acrylic resin, polycarbonate resin, polyethylene terephthalate, polyethylene naphthalate, and other polyester resins. Resin, polyamide resin such as various nylon, polyimide resin,
Polyamideimide-based resin, polyarylphthalate-based resin, silicone-based resin, polysulfone-based resin, polyphenylene sulfide-based resin, polyethersulfone-based resin, polyurethane-based resin, acetal-based resin, cellulose
Films or sheets of various resins such as glass-based resins and others
Can be used. Further, a film obtained by providing a metal vapor deposition film or an inorganic oxide film on these films, a metal foil, or the like can also be used.

As a concrete material constitution, from the surface side, polyethylene resin layer / paper layer / polyethylene resin layer, foamed polyethylene resin layer / paper layer / polyethylene resin layer, polypropylene resin layer / paper layer / polypropylene resin layer, polyethylene Resin layer / paper layer / polyester resin layer, polyester resin layer / paper layer / polyester resin layer, polyethylene resin layer / paper layer / ethylene / acrylic acid copolymer layer / aluminum foil / polyethylene resin layer, polyethylene resin layer / paper layer / Polyethylene layer / polyester layer / polyethylene resin layer, polyethylene resin layer / paper layer / polyethylene layer / polyester layer / polyethylene resin layer (film),
Polyethylene resin layer / paper layer / polyethylene layer / aluminum foil / biaxially stretched polyester layer / polyethylene resin layer, polyethylene resin layer / paper layer / polyethylene layer / deposited aluminum layer / polyester layer / polyethylene resin layer, polyethylene resin layer / paper layer / Polyethylene resin layer / silica vapor deposition layer / polyester layer / polyethylene resin layer (film).

In the above example, the shape of the paper container is a gobel top (roof) type, but the paper container of the present invention may have a brick (brick) type or the like in addition to the gobel top type. Well, it is not particularly limited.

Next, a method for manufacturing the paper container A of the present invention will be described. First, a blank before assembling the paper container A is prepared. As shown in FIG. 3, the blank 10 has the same shape as that of a conventional paper container blank,
A well-known box making machine for paper containers can be used to make a box in the same manner as a general paper container. As a material of the blank 10, a laminated sheet mainly composed of paper having a basis weight of 50 to 450 g / m ² and a breaking elongation in a longitudinal direction of 10% or more and an transverse direction of 10% or more in an environment of a humidity of 65%. Use the body.

The blank 10 is, as shown in FIG.
In the body part, the side faces 11 to 14 and the adhesive margin piece 15 are connected to each other through the fold lines a to d, and the roof part 1 forming a gable roof on the upper part thereof.
7, 19 and upper folding side surfaces 16, 18 corresponding to gables (the portions of the mountain-shaped walls at both ends of the gable roof) are connected to each other via a fold line e. Further, the bottom portion is composed of a portion that is connected to the lower side of the body portion via a fold line f, and these are heat-sealed to form a flat bottom portion without liquid leakage.

In the paper container A of the present invention, the uneven portion X is partially provided in the step of producing the blank 10. This step is a molding process using a press molding machine composed of a male mold and a female mold, and by applying heat, the molding can be further improved. In this way, it is possible to manufacture the paper container A in which the unevenness X is formed at a high angle or a low angle at a steep angle.

Next, the blank 1 provided with this uneven portion X
0 is used to make a paper container in a folded state in the same manner as a conventional paper container in a known paper container making process.

Furthermore, in the contents filling manufacturer,
It is possible to raise the folded paper container and fill the contents with a liquid filling machine to produce a paper container A in which a high uneven portion X is formed at a steep angle.

The step of providing the uneven portion X is a box-making step of folding the blank 10 after the blank-making step,
It may be performed in another step after the box making step, or in a content filling and processing step.

The paper container of the present invention can be used as a paper container for liquids such as milk, juice, liquor, health food, and granular materials such as confectionery. Moreover, since a high convex portion can be formed at a steep angle on a part of the paper container, application development such as providing a spout on the convex portion is possible. Furthermore, it is suitable for braille processing and is effective as a paper container with Braille.

[0024]

EXAMPLES Next, the paper container of the present invention will be described more specifically with reference to examples. The present invention is not limited to this.

Example 1 As a material for a paper container, polyethylene resin 20 μm / specially shaped paper (trade name: N
Pi mold paper grade “MP275” (manufactured by Nippon Paper Industries Co., Ltd.) 275 g / m ² / polyethylene resin 30
First, a blank 10 as shown in FIG. 3 was produced by using a material having a structure of μm and printing and punching.

Next, a part of the manufactured blank 10 is
A press molding machine composed of a male die and a female die was used to heat and press to deform outwardly into a convex shape to form the convex portion X1 as the concave-convex portion X to produce a blank of the paper container A1. As a material, the breaking elongation is 22.5% in the machine direction and 13.2 in the machine direction.
%, It was possible to provide a high convex portion X1 at a steep angle, and at the same time, cracks and the like did not occur during molding. This blank was made into a box, and the contents were further filled to produce a paper container A1. By making a part of the design stand out as the convex portion X1, it was possible to obtain the Gobel-top type paper container A1 with high design as shown in FIG.

Example 2 As a material for a paper container, polyethylene resin 20 μm / special molded paper (product name: N
Pi mold paper grade “MP275” (manufactured by Nippon Paper Industries Co., Ltd.) 275 g / m ² / ethylene methacrylic acid resin 30 μm / aluminum foil 9 μm / polyethylene terephthalate resin 12 μm (film) / polyethylene resin 2
Using a material having a composition of 0 μm / polyethylene resin 30 μm (film), first, a blank 10 as shown in FIG. 3 was produced by printing and punching.

Next, a part of the manufactured blank 10 is
By a press molding machine composed of a male mold and a female mold, it is pressed under heat to be deformed outwardly into a concave shape, and as the uneven portion X, the side surface 11,
A single recess X3 was formed in the lateral direction on the upper part of 13 to prepare a blank of the paper container A3. As a material, a special forming paper having a breaking elongation of 22.5% in the longitudinal direction and 13.2% in the lateral direction was used, so that a deep recess X3 at a steep angle was formed.
At the same time, the cracks and the like did not occur during molding. This blank was boxed, filled with contents, and a Gobel-top type paper container A3 as shown in FIG. 4 having a spout equipped with a cap and a main body was manufactured. By providing the concave portions X3 on the opposite side surfaces 11 and 13, when the paper container A3 is held, a finger is inserted into the portion and the paper container A3 is hard to slip and easy to hold.

[Embodiment 3] As a material for a paper container, polyethylene resin 30 μm / special molded paper (trade name: N
Pi mold paper grade “MP275” (manufactured by Nippon Paper Industries Co., Ltd.) 275 g / m ² / aluminum foil 9 μm / polyethylene terephthalate resin 12 μm (film) / polyethylene resin 60 μm.
A blank for a flat-top type paper container was produced by printing and punching.

Next, a part of the manufactured blank is hot pressed by a press molding machine composed of a male mold and a female mold to be deformed into a convex shape outward, and the convex portion X4 is formed as the concave and convex portion X. A blank of the paper container A4 was produced by forming the blank at a plurality of locations. As a material, the elongation at break is 22.5% in the machine direction and 1 in the machine direction.
By using 3.2% of the special forming paper, the high convex portions X4 can be provided at a plurality of positions at a steep angle, and at the same time, cracks and the like did not occur at the time of forming. The blank was boxed and filled with the contents to manufacture a flat-top type paper container A4 as shown in FIG. By providing the convex portions X4 on the opposite side surfaces 11 and 13, when the paper container A4 is held, it is possible to make the paper container A4 difficult to slip and easy to hold by holding the portions with fingers.

[0031]

As described above, according to the present invention,
A paper container comprising a laminated body mainly composed of paper, the basis weight of the paper being in the range of 50 to 450 g / m ² , and a humidity of 65%.
By setting the breaking elongation in the environment of 10% or more in the longitudinal direction and 10% or more in the lateral direction, forming a high or deep uneven portion at a steep angle on a part of the outer surface without cracks or the like. As a result, the effect of improving the design can be provided. Also, in order to pour out the contents from the pouring outlet, by providing this uneven portion at the position where the paper container is held, it becomes non-slip, and even when the paper container with a content of 500 ml or more is held in your hand, It has the effect of being difficult to drop and easy to handle.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a first embodiment of a paper container according to the present invention.

FIG. 2 is a perspective view showing an example of a second embodiment of the paper container according to the present invention.

FIG. 3 is a development view showing an example of a blank of a paper container according to the present invention.

FIG. 4 is a perspective view showing another embodiment of the paper container according to the present invention.

FIG. 5 is a perspective view showing still another embodiment of the paper container according to the present invention.

[Explanation of symbols]

A Paper container of the present invention A1 paper container (first embodiment) A2 paper container (second embodiment) A3 paper container (Example 2) A4 paper container (Example 3) X uneven part X1 convex X2 recess X3 recess X4 convex 10 blank 11 sides 12 sides 13 sides 14 sides 15 pieces of glue 16 Upper folding side 17 roof 18 Upper folding side 19 roof a to f polygonal line

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3E060 AA03 AA05 AA07 AB05 BA01                       BC01 DA04 DA30 EA03 EA04                       EA13                 3E086 AA22 AB03 AC07 AC33 AD02                       BA04 BA14 BA15 BA44 BB61                       BB90 CA11 CA40 DA01                 4F100 AK01B AK01C AK04 BA03                       BA10B BA10C DA01 DD01                       DG10A JL12B JL12C

Claims (4)

[Claims] 1. A rectangular tube-shaped paper container having four side surfaces, which is composed of a laminate mainly composed of paper, and has a basis weight of 50 to 50.
A paper container having a breaking elongation of 10% or more in the longitudinal direction and 10% or more in the lateral direction in an environment of 450 g / m ² and a humidity of 65%. 2. The laminated body comprises an inner layer having at least a heat-adhesive resin layer on one surface of the paper and an outer layer having at least a heat-adhesive resin layer on the other surface. The paper container according to claim 1. 3. The paper container according to claim 1, wherein an uneven portion is provided on a part of the paper container. 4. The paper container according to claim 3, wherein the concavo-convex portion is provided on the pair of opposed side surfaces.