JP2000302121A - Packaging material mainly formed of paper and paper container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively form folding lines on a paper packaging material for the purpose of reducing the bulging out of the body of a liquid container formed of a paper. SOLUTION: All folding lines L1-L4, T1 and T2 such as vertical lines, horizontal lines on a packaging material 22 formed mainly of a paper on a container main body are not formed by pressing a protruded plate from outside, but the folding lines on sections useful for preventing the bulging out of the body of the paper container 20 are formed by pressing the protruded plate from inside the packaging material 22 formed mainly of a paper to reduce the bulging out of the body of the liquid container formed of paper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fold line which is formed in advance to facilitate formation of a container body made of a paper-based packaging material, and more particularly to a paper container for storing beverages and other liquids.

[0002]

2. Description of the Related Art Conventionally, in a liquid paper container, a fold line is previously formed on a paper-based packaging material in order to facilitate formation of a container body. FIG. 7 is a development view of the paper-based packaging material in the case of a roof-type container. The fold line is shown except for the outermost contour line of the development view. As shown in the figure, the fold line is a vertical line,
Although it is composed of horizontal lines and diagonal lines, all of the fold lines are formed by grooves formed on the side corresponding to the outer surface of the container of the paper-based packaging material. Then, it is folded along the fold line and filled with the contents to be finally formed into the liquid paper container shown in FIG. Similarly, in the case of a brick type container, the fold lines are constituted by vertical lines, horizontal lines, and diagonal lines, but all of the fold lines are formed on the side corresponding to the outer surface of the container of the paper-based packaging material. It is made of groove. Then, it is folded along the fold line and filled with the contents to be finally formed into the liquid paper container shown in FIG.

[0003]

However, when a fold line is previously formed on the paper-based packaging material, all the vertical, horizontal, and diagonal lines are uniformly formed on the side corresponding to the outer surface of the paper-based packaging material. In the case where a groove is formed on the other side, a blister as shown at 32 in FIG. 3 often occurs with the passage of time after filling the formed liquid paper container with a beverage or other liquid. An object of the present invention is to provide a liquid paper container formed by taking any method with respect to a fold line previously applied to the paper-based packaging material in order to form a container body made of the paper-based packaging material. Is to reduce the occurrence of body swelling.

[0004]

According to the first or second aspect of the present invention, in order to facilitate formation of a container body made of a paper-based packaging material, a fold line previously applied to the paper-based packaging material is a vertical line. , A horizontal line, a diagonal line, a vertical fold line and a horizontal fold line are formed on the side corresponding to the inside of the container of the paper-based packaging material. is there.

More specifically, instead of forming the vertical, horizontal, and oblique fold lines on the paper-based packaging material by forming grooves on the side corresponding to the outside of the container as in the conventional case, the paper-based packaging material is used. The vertical fold line and the horizontal fold line that help prevent the material from bulging form a groove on the side corresponding to the inside of the container of the paper-based packaging material, and the other fold lines correspond to the side corresponding to the outer surface of the container as before. A groove is formed in the groove. For this reason, the groove directions of the fold lines are formed to be mixed in the same liquid paper container.

Since the liquid paper container of the present embodiment is formed so as to include a fold line effective against the blister of the body, the occurrence of blister of the liquid paper container can be reduced. That is, since the conventional vertical ridge lines 31 at the four corners form a groove on the side corresponding to the outer surface of the container with respect to the paper-based packaging material, the internal pressure of the liquid content filled in the liquid container is reduced at the four corners. When it is related to the vertical ridgeline 31 of the part, the bulge 32 is likely to occur because the concave portion of the vertical ridgeline extends and spreads, and a moving margin occurs.

On the other hand, in the case of the vertical ridge lines 31 at the four corners of the liquid container of the present embodiment, the liquid container is formed by forming a groove on the side corresponding to the inside of the container with respect to the paper-based packaging material.
Even when the internal pressure of the filled liquid content is applied to the vertical ridge lines 31 at the four corners, the concave portions of the vertical ridge lines are unlikely to act in the expanding direction, so that blistering hardly occurs. Therefore, since the formed liquid paper container includes a fold line effective for the blister, the occurrence of blister of the liquid paper container can be reduced. According to the third aspect of the present invention, since the liquid paper container manufactured by the method of the first or second aspect of the present invention, the occurrence of blistering of the formed liquid paper container can be effectively reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of a paper container according to the present invention will be described below based on an embodiment shown in the drawings. FIG. 1 is a developed view showing an embodiment of a fold line of a paper-based packaging material (roof type) 22 according to the present invention. As shown in FIG. 1, the paper-based packaging material (roof type) 22 of the present embodiment includes a plurality of vertical and horizontal lines in advance in the paper-based packaging material 22 in order to facilitate the formation of the paper container (roof type) 20. However, the diagonal fold lines are provided, but not the conventional method of forming grooves by pressing all fold lines from the outer surface of the container with a convex blade. The paper-based packaging material (roof type) 22 of the present embodiment is The vertical fold lines L1 to L4 and the horizontal fold lines T1 and T2, which are effective in preventing bulging of the paper container, are pressed from the inner side surface of the container of the paper-based packaging material 22, and the other fold lines are the same as before. In order to form a groove by pressing the convex blade from the outside, the fold line direction is mixed in the same liquid paper container.

FIG. 2 shows a paper container (roof type) 2 according to the present invention.
0 is a main part perspective view showing the state of formation immediately after filling the liquid food into the paper container. FIG. 3 shows a state after a number of days have elapsed after filling the liquid food into a paper container. As shown in FIG. 3, conventionally, the blister 32 as shown in the paper container has occurred with the passage of time, but the liquid paper container of the present embodiment includes a fold line effective for the blister. Therefore, the occurrence of blistering of the liquid paper container can be reduced. That is, since the conventional vertical ridgeline 31 at the four corners presses the convex blade against the paper-based packaging material from the outside to form a fold line, the internal pressure of the liquid content filled in the liquid container is reduced at the four corners. Longling Line 3
In the case of (1), since the concave portion of the fold line extends and spreads, a moving margin is generated, so that blistering is likely to occur.

On the other hand, in the case of the vertical lines 31 at the four corners of the liquid container of the present embodiment, the convex blade is pressed against the paper-based packaging material from the inside to form a fold line to form the liquid container. The internal pressure of the liquid content is changed to vertical lines 31 at the four corners.
However, since the concave portion of the fold line does not easily act in the expanding direction, the bulge 32 hardly occurs. According to the experimental results, when measured at a position 70 mm above the bottom (T2) of the paper container one week after filling the liquid food into the paper container, in the prior art, the body swelling is usually 79 mm to 81 mm. According to the method of the present invention, the diameter is reduced to 77 mm to 79 mm. Similarly, the effects of the present invention can be obtained for the brick type liquid paper container shown in FIGS.

FIG. 4 is a sectional view of a paper-based packaging material for a paper container according to the present invention. As shown in FIG. 4, the paper-based packaging material (roof type) 22 includes an outer layer 61, a paper base 62, and an inner layer 65 formed sequentially from the outside to the inside of the packaging container.
And the paper-based packaging material (brick type) comprises an outer layer 61, a paper substrate 62, an adhesive layer 63, a barrier layer 64, an adhesive layer 65, and an inner layer 66. Usually, the outer layer 61, the adhesive layers 63 and 65, and the inner layer 66 are formed of a resin such as polyethylene or ethylene copolymer. The outer layer 61 and the inner layers 65 and 66 are preferably made of low density polyethylene. Further, the barrier layer 64 is formed of aluminum foil or the like,
Predetermined printing is performed on the outer surface of the outer layer 61 or the outer side of the paper base 62 as necessary.

Although the embodiment has been described above, the present invention is not limited to this, and various design changes accompanying the gist of the configuration are possible. For example, in this embodiment, the fold line is formed by pressing the convex blade from the inside against the paper-based packaging material on the vertical line portions of L1 to L4 and the horizontal line portions of T1 and T2. It is also possible to press the convex blade from the inside of the paper-based packaging material only on the vertical line portion that is the most effective for the countermeasure, and press the convex blade from the outside of the paper-based packaging material on the other fold lines. Depending on the situation, it is also possible to press a convex blade on the entire fold line from the inside of the paper-based packaging material, and various combinations are possible according to the situation.

The bending line is formed by pressing a convex blade against the paper-based packaging material by a rotary or flat die method, and disposing a concave blade on the opposite side of the paper-based packaging material from the convex blade. It is generally formed by receiving the pressure of the convex blade. For example, it is also possible to form a folding line in advance in the papermaking process, and the sectional shape of the folding line is U-shaped. A shape and a V-shape are also possible, and various methods are conceivable, and these are not excluded.

[0014]

As is apparent from the above description, the method according to the first or second aspect of the present invention is directed to a method of forming a container body, which comprises a plurality of vertical lines previously applied to a paper-based packaging material. Regarding the horizontal and oblique fold lines, the fold lines at the portions useful for preventing bulging of the paper container press the convex blade from inside the paper-based packaging material. For this reason, since the formed liquid paper container includes a fold line effective for preventing blistering, the occurrence of blistering of the liquid paper container could be reduced. Furthermore, by providing a liquid paper container that does not cause blistering, the liquid paper container can give the consumer a visually sharp impression, and the consumer can hold the liquid paper container by hand when drinking. The improved grip when the tire is used can give the consumer a sense of stability and a sense of security, thereby increasing the commercial value. Therefore, even if the paper stiffness of the paper-based packaging material is lowered, the same grip property as that of the conventional product can be secured, so that the raw materials can be reduced and the cost can be reduced.

Further, the vertical fold lines L1 to L1 of the paper-based packaging material
L4 and the horizontal fold lines T1 and T2 are formed by pressing a convex blade from the inside of the paper-based packaging material to form a fold line, and then the direction in which the convex portion of the fold line is not inverted (the direction in which the convex shape is maintained as it is). In order to form the liquid container by bending the panel of the paper-based packaging material, the moment force on the fold line portion is smaller than that in the case where the convex blade is pressed from the inside of the conventional paper-based packaging material to form the fold line. Since it can be formed by force, the possibility of occurrence of cracks in the bent portion can be reduced, which leads to quality improvement.

According to the third aspect of the present invention, since the liquid paper container manufactured by the method of the first or second aspect of the present invention, the occurrence of blistering of the formed liquid paper container can be effectively reduced. In addition, the liquid paper container can give a visually sharp impression to the consumer, and since the grip property when the consumer holds the liquid paper container by hand at the time of drinking is improved, a sense of stability and The product value is improved because it can give a sense of security. Therefore, it is possible to reduce the raw materials by reducing the paper stiffness of the paper-based packaging material, which can contribute to cost reduction.
Further, since the moment force on the fold line portion of the paper-based packaging material can be formed with a smaller force as compared with a case where a convex blade is pressed from the inside of the conventional paper-based packaging material to form a fold line, Can reduce the possibility of occurrence of cracks, which leads to quality improvement.

[0017]

[Brief description of the drawings]

FIG. 1 is a developed view showing an embodiment of a fold line of a paper-based packaging material (roof type) according to the present invention.

FIG. 2 is a perspective view of a main part showing a state of forming a paper container (roof type) according to the present invention.

FIG. 3 is a side view of the paper container according to the present invention for comparing and explaining a state of the paper container with blistering and a state without blistering.

FIG. 4 is a cross-sectional view of a paper-based packaging material of a paper container according to the present invention.

FIG. 5 is a paper-based packaging material (brick type) according to the present invention.
It is a development view showing an embodiment of a fold line.

FIG. 6 is a perspective view of an essential part showing a paper container (brick type) according to the present invention.

FIG. 7 shows the paper-based packaging material (roof type) according to the present invention.
It is a development view showing a conventional fold line.

[0018]

[Description of Signs] L1 to L4 Vertical fold line T1, T2 Horizontal fold line 20 Paper container 22 Paper-based packaging material (roof type) 23 Paper-based packaging material (brick type) 31 Vertical ridgeline 32 Body swelling 61 Outer layer 62 Paper base Material 63 Adhesive layer 64 Barrier layer 65 Adhesive layer 66 Inner layer

[0019]

Claims (3)

[Claims] 1. A packaging material which is preliminarily creased in order to facilitate formation of a container body made of a paper-based packaging material, wherein at least a crease line to be mountain-folded corresponds to the inside of the container. Consisting of a groove formed on one side (for paper containers)
Paper-based packaging material. 2. A fold line that is valley-folded when the container is formed,
The paper-based packaging material according to claim 1, comprising a groove formed on a side corresponding to the outside of the container. 3. A packaging container produced from the paper-based packaging material according to claim 1.