JP2003312650A - Easily unsealable paper container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealable and easily unsealable paper container in which a body part of the paper container can be easily unsealed only by hand without providing a spout having a plastic spouting piece fitted thereto or unsealing the paper container to form the spout by using scissors. <P>SOLUTION: This paper container comprises a prismatic barrel part comprising four barrel part side panels, a roof part, and a bottom part by using a laminate comprising an outer layer, an intermediate layer mainly consisting of paper, and an inner layer. An unsealable band is formed by two cut lines over the entire transverse periphery of the barrel part. The cut lines are continuous or discontinuous semi-broken and piece other layers while leaving at least the inner layer of the laminate. <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 an easily openable paper container that contains contents such as liquids and granules, has an airtight property, and has an easily openable function.

[0002]

2. Description of the Related Art Conventionally, as a paper container for storing contents such as liquids and granules, a Gobel top type having a roof-shaped upper portion and a flat column type flat-top type having a flat upper portion and so on. Various shapes have been proposed as a method for opening these paper containers. Unlike a gable-top type paper container with a gable-shaped roof, the top rib is a flat-top type rectangular flat-top paper container, and the top ribs are sealed together on top of one another. Is folded to the side wall panel side and is used for some liquid products. As the unsealing method, it is known that the ear is raised and the tip thereof is cut with scissors, or a plastic spout that is separately molded in advance is attached to the upper part by heat sealing to form a spout.

[0003]

However, the conventional method for opening a flat-top type paper container has the problem that scissors are required to raise the folded ear portion and cut the tip thereof. There is a problem that the tip of the cut ear becomes a chip and scatters around. Also,
The method of pre-attaching the plastic spout is not only to attach the spout to any part of the rectangular parallelepiped of the flat top carton and spoil the compact rectangular parallelepiped packaging form, but also to make it difficult to stack such as stacking, There is a problem in terms of space saving. In addition, the use of a plastic dispensing tool causes a cost increase and cannot be used for a low-priced product, which is a problem in terms of cost. In addition, there is a method of piercing a spout with a sharp tip prepared separately from the carton from the outside to pour out the liquid inside, but there is the inconvenience that the spout must be used at the time of using the product, and the same. If the spout is continuously used as it is for different liquid products, there is a problem that the liquid content is mixed, and the repeated use without washing is also a hygienic problem in the case of beverages.

The present invention has been made in view of the above-mentioned problems, and is a paper container having a hermeticity, which is provided with a spout to which a spouting tool such as plastic is attached, or is opened by using scissors or the like. It is an object of the present invention to provide an easily openable paper container in which the body of the paper container can be easily opened without using a spout.

[0005]

Means for Solving the Problems The gist of the present invention, which is means for solving the above problems, is as follows. 1) Using a laminated body composed of an outer layer, an intermediate layer mainly composed of paper, and an inner layer, it is composed of four body side panels 4
A paper container comprising a prismatic body portion, a roof portion, and a bottom portion, characterized in that an opening band is formed by two cut lines along the entire circumference in the lateral direction of the body portion. It is an easy-open paper container. 2) The break line is a continuous or discontinuous semi-cut shape that penetrates other layers except at least the inner layer of the laminate. 3) In the intermediate layer of the laminated body, an aluminum foil is laminated on the inner layer side of the paper. 4) It is characterized in that the cut line is provided on the surface side of the aluminum foil due to a damage scar caused by irradiation of laser light.

According to the present invention, a paper container having a hermetic sealing property is provided, in which a spout of plastic or the like is formed by tearing an opening band provided by two parallel cut lines over the entire circumference of the body. It is possible to provide an easily openable paper container in which the body of the container can be easily opened only by hand without providing an attached spout or opening it with scissors or the like to form the spout.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below with reference to the drawings.

FIG. 1 is a perspective view showing an easily openable paper container according to the present invention. The easily openable paper container A is a quadrangular prism-shaped body D composed of four body-side panels, using a laminated body composed of an outer layer, a paper-based intermediate layer, and an inner layer.
The upper folding roof panels 2T and 4T facing each other, which are continuously provided on the upper sides of the body side panels 2 and 4, are bent outward by diagonal fold lines, respectively, and at the same time, are continuously provided on the upper sides of the upper folding roof panels 2T and 4T. The ribs 2R and 4R are folded in two at the center, and in conjunction with this, the remaining opposing upper roof panels 1T and 3T that are continuously provided on the upper sides of the body side panels 1 and 3 are bent inward to form two. Folded ribs 2
R, 3R and the upper roof panels 1T, 3T and ribs 1R, 3R that are continuously provided on the upper side are horizontally sealed by opposing ones to form a rib portion R, and the rib portion R is formed on either side. The flat roof portion T is formed by tilting and flattening, and further by bending the ends on both sides of the rib portion R onto the body portion side panels 2 and 4 and partially adhering and fixing them. It is a sex paper container A.

In addition, an opening band O is provided on the body portion D by two parallel semi-cut lines P and Q. The V-shaped notch V,
V is provided respectively, and the starting end of the unsealing band O is used as a pick portion o. By gripping and pulling the gripping portion o, the easily openable paper container A can be opened while tearing the body portion D by the opening band O.

FIG. 2 is a development view of the blank 10 of the easy-open paper container A. As shown in FIG. 2, the body-side panels 1, 2 are provided as the portion forming the body D of the easily-openable paper container A.
3 and 4 and the glue allowance panel 5 are successively provided in series through the fold lines a, b, c and d. Further, as a portion that forms the upper roof portion T, the upper folding roof panel 2 is provided on the upper side of each of the body side panels 1, 2, 3 and 4 via a fold line e.
T, 4T and upper roof panels 1T, 3T are continuously provided, and ribs 1R, 2R, 3R, 4R for top seal are continuously provided on the upper side thereof through a broken line h. Further, the upper folding roof panels 2T and 4T are provided with folding lines g and g for bending the upper folding roof panels 2T and 4T outward. Also, the rib 2R,
In 4R, folding lines i, i for folding in two are provided vertically in the center.

Each bottom panel forming the bottom portion B is a polygonal line f on the lower side of each body side panel forming the body portion D.
And a flat bottom portion B without liquid leakage is formed by heat sealing.

The point of the easily openable paper container according to the present invention is, as shown in FIG. 2, an unsealing band O over the entire circumference of the body side panels 1, 2, 3, 4 forming the body D. Is provided. The unsealing band O is provided by two parallel cut lines P and Q spaced at a predetermined interval.
The position thereof is arbitrary if necessary, but it is preferable to provide it on the upper part of the body D as much as possible so that the contents do not spill when opened. The cut lines P and Q are semi-cut shapes that penetrate substantially the outer layer and the intermediate layer except at least the inner layer of the laminate forming the paper container, and can be provided continuously or discontinuously (perforated). Also,
V-shaped notches V and V are provided at the starting ends of the cut lines P and Q, respectively, and the starting end of the unsealing band O serves as a pinch o.

Further, in order to make it easier to pick the knob portion o, when the body side panel 1 and the glue allowance panel 5 are pasted together, the knob portion o can be easily peeled off from the glue allowance panel 5 by a known anti-heat treatment. It is preferable to partially coat the portion of the glue allowance panel 5 where the picking portion o overlaps with the sealing agent. The coating of the anti-heat sealing agent is the portion shown in U of FIG. 2, and it is important not to apply it to the inner edge portion so as not to impair the sealing property of the paper container. By gripping and pulling the grip portion o, the easy-open paper container A of the present invention can be opened while tearing the body portion D by the opening band O.

In order to form the easily openable paper container A as shown in FIG. 1 from the blank 10 described above, first, the blank 10 is vertically folded in three lines along the folding line a and the folding line c, and the glue allowance panel 5 and the body side. Panel 1, upper roof panel 1T, rib 1R
Is frame-sealed and pasted on a tube to form an easily openable paper container A that is flatly folded. This is supplied to a molding and filling machine, raised in a prismatic shape, first the bottom B is molded, and after filling the contents, the upper folding roof panels 2T, 4T are bent outward along the fold lines g, g, and the ribs on the upper part 2R,
4R is folded in two at the central vertical fold line i, i, and in conjunction with this movement, the upper roof panels 1T, 3T fold inward, and the opposing ribs, that is, the two folded ribs 2R aligned in a horizontal line Comrades, half-folded ribs 4R Comrades, ribs 1
R and the rib 3R are sealed together to form a rib portion R, the rib portion R is tilted to one side at a polygonal line h, and a polygonal line g,
The ears at both ends, which are bent outward at g, are bent at the fold line e on the body side panels 2 and 4 of the body D and partially heat-bonded and fixed by a frame seal. It is preferable that the position where the ears are partially adhered should avoid the position of the unsealing band O provided on the body part side panels 2 and 4.

As shown in FIG. 3A, the laminated body L which is the material of the easily openable paper container of the present invention is composed of an outer layer L1, an intermediate layer L2 mainly made of paper, and an inner layer L3. . The outer layer L1 and the inner layer L3 are made of a polyolefin resin, and as the polyolefin resin, low density polyethylene, linear low density polyethylene, medium density polyethylene, polypropylene, ionomer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid It may be selected from a copolymer, ethylene / acrylic acid ester, ethylene / vinyl alcohol copolymer and the like. The intermediate layer L2 is a layer mainly composed of paper, and is a single piece of paper or a laminated layer of other plastic on the paper. For example, it may be a multilayer including aluminum foil and the like, and specifically, the intermediate layer L2 may be composed of paper / adhesive resin made of ethylene copolymer / aluminum foil / polyester, etc. To a laminate L having a constitution of polyethylene / paper / adhesive resin made of ethylene copolymer / aluminum foil / polyester / polyethylene. Examples of the adhesive resin made of this ethylene-based copolymer include ethylene-methacrylic acid copolymer (EMAA) and ethylene-acrylic acid copolymer (EA).
A) and the like. By using the laminated body L having this structure, it can be used for a paper container for alkaline contents such as detergents, bath salts and alcoholic beverages.

Next, an unsealed strip O is attached to the laminated body L as described above.
The method of providing the cut lines P and Q for the above in a semi-cut form will be described. Examples of such methods include a needle punch method of pressing a heated needle, an embossing roll,
Melting a film using a polishing roll, a grindstone, a polishing tape, etc., a hot-melt perforation method for perforating, a physical perforation method using a knife, a cutter, etc., a laser beam processing, It can be performed by processing such as corona discharge and plasma discharge.

In the easily openable paper container of the present invention, as shown in FIG.
As shown in b, when the cut lines P and Q are provided so as to substantially penetrate the outer layer L1 and the intermediate layer L2 from the front side while leaving at least the inner layer L3, the state of the laminated body L laminated as described above, the laminated body Provided in any state such as a blank of an easily openable paper container using L, a state of assembling the blank, an easily openable paper container packaged by assembling the blank and filling and packaging the contents. May be.

In the easily openable paper container of the present invention, the cut lines P and Q have a semi-cut shape such as a straight line, a perforated line shape, and a broken line shape, and the distance between them, that is, the width of the tear strip O is:
It can be arbitrary so that it can be easily picked with a finger.
Further, the semi-cut structure of the cut lines P and Q is such that at least the inner layer L3 is left and a cut is made so as to substantially penetrate the outer layer L1 and the intermediate layer L2. From the point of view of suitability for protecting the contents,
A structure that penetrates all the layers of the laminated body L is not desirable, and it is important to leave at least the inner layer L3.

In the present invention, the preferred combination of the structure of the laminated body L and the method of providing the cut lines P and Q for the tear strip O is as follows.

The laminated body L has a structure in which the intermediate layer L2 is laminated with aluminum foil on paper and the aluminum foil is located between the paper and the inner layer L3. For example, the composition of the above-mentioned intermediate layer L2 is adhesive resin / aluminum foil / polyester composed of paper / ethylene copolymer, and adhesive resin / aluminum composed of polyethylene / paper / ethylene copolymer from the outside as a whole. For example, it may be a laminate of foil / polyester / polyethylene.

On the other hand, as a method of providing the break line P,
This is a method using laser beam processing. Irradiation of a pulse oscillation type laser can be used to provide continuous or discontinuous cut lines P. In general, carbon dioxide laser light is used, and processing is performed by irradiating through a slit grating made in accordance with the shape to be processed. At that time, the material that absorbed the laser light generated heat instantly,
It can be melted, misted and removed, and formed into a half-cut shape having a desired shape. The method of directly irradiating the focused laser beam is the most efficient and preferable method among the processing methods using the laser light because the energy can be concentrated. Other than carbon dioxide gas laser, YAG laser, semiconductor laser, argon ion laser, etc. can be used as the type of laser, and are not particularly limited.

According to this combination, by irradiating the laser beam from the front side of the laminated body L, as shown in the schematic sectional view of FIG. The middle layer L2 and the outer layer L1 including the paper above AL) can be scored by breaking scratches. Therefore, the inner layer L3 and the aluminum foil (AL) remain without being damaged, and the hermeticity as an easily openable paper container is maintained.

FIG. 4 is a view for explaining the opening of the easily openable paper container of the present invention. The easy-open paper container A of the present invention is opened as follows.
Very easy, in the case of flat top type easy-open paper container,
First, as shown in FIG. 4-a, the ears including the ribs R partially adhered to the body side panels 2 and 4 are peeled off, and then, as shown in FIG. Cut lines P and Q on D
The tearing band O provided by is only to be torn by picking the picking portion o, and by tearing the entire circumference of the body portion D, as shown in FIG.
As shown in -b, the entire upper portion of the body portion D can be opened.

The easily openable paper container according to the present invention is not limited to the above-described embodiment or examples, and various modifications can be made without departing from the scope of the present invention. For example, the horizontal cross section of the easy-open paper container does not necessarily have to be square, and may be rectangular. Alternatively,
Instead of the flat top type paper container, a gobel top type easy-open paper container B as shown in FIG. 5 may be used.

[0025]

EXAMPLES Next, regarding the easy-open paper container of the present invention,
A more specific description will be given with reference to examples.

Example 1 In order to apply the easy-open paper container according to the present invention to commercial juice, the size is 13
An easily openable carton having a size of 6 mm, a width of 70.2 mm, a depth of 70.2 mm, and an internal capacity of 750 ml was produced.
As for the material, polyethylene 20 μm is used for the outer layer, bleached kraft paper 313 g / m ^{2 for} the middle layer, and polyethylene for the inner layer is 30 μm.
A laminate having a layer structure of 0 μm / paper 280 g / m ² / polyethylene 30 μm and having an overall basis weight of 356 g / m ² was used to produce a blank 10 as shown in FIG. 1 by a printing process and a punching process. It was made. In the printing process, partial coating of the anti-heat-sealant on the glue allowance panel was performed, and in the punching process, half-cutting of the cut lines P and Q forming the opening band O was also performed at the same time. The cut lines P and Q are formed in a semi-cut shape with polyethylene of 30 μm left. The blank 10 obtained by performing the above processing was tube-bonded by a tube-sticking machine as in the conventional case, and then molded, filled and sealed by a molding-filling machine. The product obtained through the above processing was opened, but it was successfully opened.

<Embodiment 2> In order to apply the easy-open paper container according to the present invention to commercial oil, the size is 160 mm and the height is 160 mm.
mm, width 85 mm, depth 85 mm, content capacity 100
A blank 10 of a 0 ml paper container was prepared. The laminate, which is the material, comprises polyethylene 30 μm as the outer layer, bleached kraft paper 280 g / m ^{2 as} the middle layer, and linear low-density polyethylene 60 μm as the inner layer in the order of 30 μm polyethylene / 280 g / m ² paper / 20 μm polyethylene
Aluminum foil 7μm / Linear low density polyethylene 60μ
The total basis weight is 400 g / m.
^{Is 2} . Laser light is applied from the front side of the blank 10 made of this laminated body to the body side panels 1, 2, 3, 4,
A straight, semi-cut line P, Q across the glue allowance panel 5.
An opening band O was provided. The cut lines P and Q were formed in a semi-cut shape with aluminum foil 7 μm / linear low density polyethylene 60 μm left. The blank 10 obtained by performing the above-mentioned processing was tube-adhered by a tube-applying machine in the same manner as the conventional one, and then the content was formed, filled, and sealed by a forming-filling machine. This product was opened by opening the open band O by tearing the open band O by tearing the open band O, so that the entire surface could be opened.

[0028]

According to the easily openable paper container of the present invention, it is a paper container having a hermeticity, and tearing the opening band provided by two parallel cut lines over the entire circumference of the body portion. With this, there is an effect that the body of the container can be easily opened only by hand without providing a spout to which a spout such as plastic is attached or using scissors to open the spout. is there.

Particularly, in the case of a flat-top type paper container, the spout can be easily formed by manually opening the upper end of the body, and conventional scissors or spout must be prepared separately. It can be easily used anywhere compared to the conventional shape that could not be opened, and the advantages of the flat-top type paper container such as compactness and rationality of integrated packaging can be utilized.

Further, as a material, a laminate comprising an outer layer, an intermediate layer mainly composed of paper, and an inner layer, and an aluminum foil laminated on the inner layer side of the intermediate layer of paper is used, and a cut line is formed by irradiation of laser light. By processing the wire into half-cuts, the upper side of the aluminum foil is destroyed and damaged, and the lower side of the aluminum foil including the inner layer remains undamaged.
The effect is that the sealing property of the paper container is sufficiently maintained.

Further, by tearing an unsealing band provided on the entire circumference of the body, the entire upper part of the body can be opened, and in the case of contents of high viscosity, the contents are frozen and frozen, etc. There is also an effect that the contents can be taken out easily. ,

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of an embodiment of an easily openable paper container according to the present invention.

FIG. 2 is a development view showing a blank of an embodiment of the easily openable paper container of the present invention.

FIG. 3 is a schematic cross-sectional view of a laminate and a cut line.

FIG. 4 is a view for explaining opening of one embodiment of the easily openable paper container of the present invention.

FIG. 5 is a perspective view showing a main part of another embodiment of the easy-open paper container of the present invention.

[Explanation of symbols]

A easy-open paper container (flat top type) B Easy-Open Paper Container (Goebel Top Type) 1-4 body side panel 5 glue panel 10 blank a to i polygonal line 1T, 3T upper roof panel 2T, 4T top folding roof panel 1R-4R rib B bottom D body R rib T roof O open band o Picking section P, Q break line U Anti-heat seal coat part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeshi Kunihiro             1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo             Dai Nippon Printing Co., Ltd. (72) Inventor Tetsuhiko Nagahashi             1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo             Dai Nippon Printing Co., Ltd. (72) Inventor Yukinobu Yamaguchi             1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo             Dai Nippon Printing Co., Ltd. F-term (reference) 3E060 AA03 AB04 BA01 BC01 BC04                       CE05 CE08 CE15 CE18 CE23                       CF05 DA17 DA30 EA03 EA04                       EA13 EA14                 3E067 AA03 AA05 AB26 AB99 BA05A                       BA06A BB01A BB12A BB14A                       BB15A BB16A BB25A BC06A                       CA24 EA01 EA04 EA06 EB06                       EB11 EB23 FA01 FC01

Claims (4)

[Claims] 1. A laminated body composed of an outer layer, an intermediate layer mainly composed of paper, and an inner layer is used to form a quadrangular prism-shaped body portion composed of four body-side panels, a roof portion, and a bottom portion. An easy-open paper container, characterized in that the opening band is formed by two cut lines over the entire circumference of the body in the lateral direction. 2. The easy-open paper according to claim 1, wherein the cut line is a continuous or discontinuous semi-cut shape that penetrates other layers except at least the inner layer of the laminate. container. 3. The easily openable paper container according to claim 1, wherein an aluminum foil is laminated on the inner layer side of the paper in the intermediate layer of the laminate. 4. The easily openable paper container according to claim 3, wherein the break line is provided on the front surface side of the aluminum foil due to a breaking scratch caused by irradiation with laser light.