JPH0948426A - Sealed carton which can be easily unsealed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unseal a sealed single wall carton made of a laminated board of a base material and a sealant, in which contents can be directly stuffed, by only fingers. SOLUTION: A scored cut, perforations, or a half-cut C is provided in advance on the surface of a base material. After that, a sealant layer L is provided or after a laminate process till the sealant layer, has been finished, a half-cut is provided from the surface of base material. And further, one or more barrier layers B are laminated in the constitution of a base material.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a sealing material and a barrier material (hereinafter also referred to as a barrier) as a property of blocking the permeation of water vapor, oxygen, etc., which adversely affects the contents, from the outside. As a paper container for filling and packing, it can be used as a container for snacks, liquid beverages, shampoos and rinses, car cleaning liquids, and the like. There are various types of containers used as sealed paper containers. Recently, the technology of regular tetrahedron containers or paper cups such as Goebel top type paper containers, brick (brick) paper containers, which are widely used in many applications such as milk, juice, coffee and tea beverages, mineral water, sake, etc. And those that use paper tube technology. Various methods have been devised as a method of taking out contents from these paper containers.

[0002]

2. Description of the Related Art For example, in the case of a method of attaching a spout of a separate piece or a case of a gobel top type paper container,
An anti-heat-sealing agent is partially applied to the heat-sealing portion of the opening planned portion to weakly seal it and the weak sealing portion is forcibly peeled off to form an opening portion, or cut with scissors to form an opening portion. And so on. In addition, a method of attaching a straw has been put into practical use for liquid drinks and the like that can be drunk once. The method of attaching the spout of the separate piece, the shape of the spout is also various, opening,
Various efforts have been made in terms of the dispensing property and the capping function. However, since another molded product is added to the container body, the cost must be increased. Also, the method of attaching a straw is not as high as the cost of the separate molded product, but a slight cost increase is inevitable and at the same time a large volume (for example, 500 ml).
In the above case, it is difficult to apply. Partially applying the anti-heat seal agent used in the Goebel top type paper container, a method of weakly sealing, the cost increase is little, but stabilization of weak sealing is a problem, and, There is a problem that it is difficult for elderly users to open the package. Also, this method is difficult to use for paper containers of shapes other than the Gobeltop type. These paper containers are
Although it has been developed and put into practical use for liquids, it is a single wall container assembled by heat sealing,
By laminating various plastic films, it has moisture-proof and oxygen-blocking properties as a food storage container, and since it uses a relatively rigid paper material, it does not require secondary packaging. It can be displayed as it is. Therefore, it is a packaging form that has the potential to be applied to a wide range of applications such as dry foods and snacks, regardless of liquid.

When a paper container is used for packaging the above-mentioned dried food, snack food, etc., it must have an easy-open property. However, in paper containers, compared to general soft packaging, the paper used is relatively thick, or as a laminated material for it, a film such as a polyester film or polyamide (nylon) film that is difficult to tear is laminated. In particular, it cannot be opened with fingers.

[0004]

DISCLOSURE OF THE INVENTION An object of the present invention is to prevent unsealing of a laminated base material including a plastic film used for the effect of improving paper and barrier properties in a single wall paper container. The object of the present invention is to provide a paper container in which the opening can be easily formed only by the force of fingers.

[0005]

The paper container of the present invention is the following paper container in which the opening can be easily formed only by the force of fingers. That is, in a single-wall carton manufacturing process capable of directly packing contents and having hermeticity, a cutting blade or perforation is provided from one surface of the base material in advance at a position where the unsealed portion of the carton is formed, and then, A sealant layer is provided on the other surface of the base material, or after laminating a base material and a sealant layer, a half cut that does not penetrate the sealant layer from the base material surface is provided to form an unsealed portion. Further, the present invention is an easily openable sealed carton including a structure in which one or more barrier layers are laminated on the layers constituting the base material.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The paper container of the present invention is a single-wall carton formed by a heat-sealing technique and has a complete sealing function. Brick type, regular tetrahedron, etc. The single-walled carton is composed of laminated wall materials. Since a paperboard material is used as a component of the laminated wall material, it is called a paper container. The base paper for the paper container is often used as a base paper for milk carton, which is made from 100% virgin pulp, and has a weight of 250 to 450 g / m ² , but the present invention is used for dry foods, snacks, etc. In doing so, thinner papers, for example, papers with a weight of up to about 150 g / m ^2, can also be used. The heat-sealing technique can be performed by laminating a synthetic resin having heat-sealing property on the front and back of the paperboard material, and for the purpose of preserving the content, an aluminum foil or a plastic film having a barrier property is used. It may be used as a laminated material.

The single-walled paper container is one of the widely spread packaging forms for liquid packaging in recent years. The reason for the widespread use is that the type and quality of the packaging material are improved, the lamination technology is advanced, and printing is performed. Various processes such as punching and punching, and advances in technology related to packaging machines and the like are included. However, since it was limited to liquid contents, it was rarely used for snacks and dried foods. The paper container, as a way of putting out the contents at the time of use, milk, a method of opening due to the weak sealing property by the anti-heat sealing agent applied to the roof part mating part of the Goebel top often used for applications such as juice, There was a method such as spouting of another molded product, which is often used for sake, shochu, and seasonings, but as mentioned above, even when trying to expand to snacks and dried foods, it is necessary to form an opening suitable for the application. For example, there is no method of forming a large opening with only fingers without using scissors.

The present invention provides a paper container which can be opened greatly by the force of fingers while maintaining hermeticity. The method is to form an easy-opening part with a cutting blade or perforations at a desired part of the shape of the paper container to be applied, and the consumer can use the force of the fingers at the time of use to form a size or shape suitable for the contents. It can be opened, and will be specifically described below. FIG. 1 shows a specific example of an easy-open sealed carton according to the present invention (hereinafter referred to as this example), (a) is a perspective view of the easy-open sealed carton, (b) is a plan view, and (c) is a plan view. It is a cross-sectional enlarged view of an easy-open processing part. The material composition of the web in this example is PE
/ Paper / PE / aluminum foil / PE, and the thickness or weight of each material used is as follows. PE: 20 μm Paper: 210 g / m ² PE: 20 μm Aluminum foil: 9 μm PE: 50 μm PE is melt-extruded to a thickness of 20 μm and coated on the paper.
Printed on the PE side. An opening perforation C is inserted from the printing surface side at a predetermined position according to the printing of the winding, and polyethylene E is laminated on the back surface with an aluminum foil as an adhesive resin, followed by PE (polyethylene L) as a sealant layer. ) Was coated by melt extrusion to a thickness of 50 μm. Subsequently, folding lines were provided and punching was performed to obtain a predetermined blank. As is clear from the cross section of the perforated part [Fig. 1 (C-1)], the aluminum foil layer as the barrier layer has no perforations, but the aluminum foil of about 9 μm is Following the perforations on the material (PE / paper), it is torn and becomes an easy-open container.
If SiOx vapor deposition PET is used instead of the aluminum foil, the procedure is as follows. The material composition of the web in this example is PE /
Paper / PE / SiOx vapor-deposited PET / PE, and the thickness or weight of each material used is as follows. PE: 20 μm Paper: 210 g / m ² PE: 20 μm SiOx vapor deposition PET: 12 μm PE: 50 μm PE (polyethylene E) is melt-extruded on paper to a thickness of 20 μm, and the polyethylene E surface is printed. gave. Next, polyethylene was used as an adhesive resin for the sandwich laminate, and the paper surface and the SiOx vapor deposition surface of SiOx vapor deposition PET were bonded together and rolled up. Put the cutting blade C for opening at a predetermined position according to the printing of the winding, and set the back surface (SiOx vapor deposition).
PE (polyethylene L) was coated as a sealant layer on the PET surface of PET by melt extrusion to a thickness of 50 μm. Subsequently, folding lines were provided and punching was performed to obtain a predetermined blank. As is clear from the enlarged cross-sectional view (C-2) of the portion provided with the cutting blade C, SiOx vapor deposition which is the barrier layer
Since it is a cutting blade up to the PET layer, it becomes an easy-open container. The blanks obtained in each of the configurations of the above two examples were end-face treated by the skive & hemming method, and a sleeve was produced by a frame sealer. Using a packaging machine, 25 mini bean donuts were placed and hermetically sealed. The unsealed portion C of the obtained container could be easily opened with only finger force in any of the configurations, and could be used as a top-open type container.

FIG. 2 is an explanatory view of a method of providing an easy-opening function according to another method of the present invention. (A) is a perspective view before unsealing, (b) shows the opened state, (c) is an enlarged cross-sectional view of the laminated body of the unsealing part. FIG. 3 is a plan view thereof. In this embodiment, the adhesive plate 1, the rear plate 2, the side plate 3, the front plate 4, the side plate 5, the rear plate 6 and the adhesive plate 7 are connected to each other via the creases, and the creases are formed on the top and bottom of each plate. The top plate t, the bottom plate s, and the top and bottom adhesive plates f are connected to each other through the side plates 3 and 5
Of the top plates 3t, 5t and the bottom plates 3b, 5b, the diagonal ruled lines x, the top and bottom adhesive plates 3tf, 5tf, 3bf, 5bf,
A fold line y extending outward from the set point of the diagonal lines is provided. In this example, the top plate 3t connected to one side plate 3
Also, an adhesive plate 3tf half cut C connected to the top plate is provided from the front side. The depth when the half cut is provided is
The paper P of the laminate is cut and the barrier layer is not cut [FIG. 2 (C-1)]. Triangular parts formed on the upper part of the side plate 3 when the carton is formed by each folding rule of the carton and the adhesive plates are heat-sealed [Fig. 1 (a)].
An easily opened linear portion C is formed on. Also, make a perforation from the surface of PE / paper or PE / paper / PE substrate, and then deposit SiOx.
A barrier layer such as PET may be laminated (C-2). If the V notch v is provided at the end of the half-cut of the top adhesive plate as a first trigger for easy opening, the opening will be easier. The opening K is formed by opening the v-notch along the half-cut line.

By changing the size of the cutting edge processing, perforation processing, or the position of the half cut C to change the size,
The opening can be set freely. The shape of this example is suitable as an opening for liquid.

The material of the laminate forming the carton is PE
/ PE / paper / PE 3 layer structure
A substrate provided with or a substrate provided with PE on both sides is used as a base material. Printing J is performed on the E side of the base material, folding lines are provided, and a cutting blade or a half cut C is inserted at a predetermined position from the front surface, that is, the printing surface side, and then the sealant L is formed on the back surface of the web. PE is provided, or the half cut C is provided after the sealant L is also laminated. Also, when the material of the laminate constituting the carton includes a barrier layer, the barrier layer and the sealant layer are laminated after the cutting blade or the perforation is processed on the base material, or the barrier layer is laminated on the base material. Either a cutting blade or a perforation may be provided, or half-cutting may be performed after forming the final laminate up to the sealant layer. In the case where the formed easy-opening portion is a laminated body including the cutting blade or the perforated portion C, since the cutting blade or the perforated portion is composed only of the sealant layer, only a small amount of fingers is used. With force, it can be torn and the opening K can be formed, thus resulting in an easy-open carton. Further, when half of the thickness of the paper is half-cut, the opening K is formed by applying a stronger force than the tear resistance of only the barrier layer and the sealant layer. At that time, if the I-notch and the V-notch are provided so as to include the barrier layer and the sealant layer, the opening can be performed very easily.

Next, steps for carrying out the present invention will be described. The web constituting the paper container is composed of a base material layer and a sealant layer. As the base material in the present invention, paper, PE / paper, PE / paper / PE or other simple paper, and a laminate material of paper and PE (first group)
And a laminate of the above-mentioned paper alone or a laminate material of paper and PE with a barrier layer such as a metal foil, various plastic films, and a coated (including vapor deposition) plastic film (the 11th group). Be divided. An example of carrying out the present invention using PE / paper in the first group of the substrates will be described. A printing base paper of PE / paper material is prepared by winding (roll). A rotary gravure printing machine or the like is used to perform printing (in-line) or, in a separate step, insert a cutting blade at a desired position and wind it. Then, PE is melt extrusion coated on the side of the winding opposite to the printed side. After that, by the prescribed crease and draw process,
Make a blank. Further, a folding rule may be provided in the step of inserting the cutting blade.

From the surface of the laminated body which has been laminated as a substrate, a cutting blade or perforation is applied, and it is wound in a roll shape and wound again, and again in a roll shape, from the back surface to the entire surface such as polyethylene. The backing material is a sealant or a barrier material such as aluminum foil which has a tearable property. Post-processing such as end face processing and frame sealing may be performed by ordinary steps. Areas of cutting blades, perforations and the like are extremely small with respect to the entire area and do not cause any hindrance when forming a carton.

When a base material belonging to the 11th group is used, the order of carrying out the present invention may be changed depending on other materials to be added.
When PE / paper / PE / KPET is used as the base material, PE / paper / PE / KPET is used as the printing base material
The surface is subjected to roll-up printing, and then a cutting blade or perforation is placed at a desired portion and rolled up. After the sealant layer S is provided on the KPET surface, a predetermined crease is provided and the blank is punched. Print the print on the PE side of PE / paper and print it by KP
The ET may be laminated later. Further, in the case of forming the easily opened portion by half-cutting, after the lamination up to the sealant layer is completed, the half-cutting is performed from the front side of the carton, and the depth and the like are as described above.

In either case of the first group and the eleventh group of the above-mentioned base materials, the obtained blank is subjected to an end surface treatment such as a tape attachment method or a skive & hemming method, and is tube-attached by a frame sealer. , Supply to packaging machines. Further, from the packaging material in a wound state, it is also possible to carry out the present invention in a so-called automatic packaging machine for molding a container and filling and sealing the contents, in this case, without the blank removing step,
The material is wound up, slit into a predetermined width and supplied to a packaging machine. No matter which method is used for packaging, there is no problem with easy opening.

It is preferable to use a cutting blade method for the knob portion and a V-notch or the like depending on the shape of the carton. That is, it is desirable not to provide a connecting portion on the base material, that is, when tearing the portion to be opened in order to form the opening, the first step can be smoothly torn, and in the subsequent tearing, It was confirmed that even if there was resistance, it could be torn relatively easily. As a result of various experiments, in the present invention, the opening is made easier within 5 mm from the starting point of the knob by not providing a connecting portion as a cutting blade. The V notch is preferably provided after forming the container.

Experiments were carried out on the change in the amount of permeation of water vapor and oxygen, which adversely affects foods, confectionery, etc., by the cutting blade or perforation according to the present invention. The packaging material used is
PE / paper / PE / aluminum foil / Dl / PET / PE, and the thickness or weight of each material is as follows. PE: 20μm Paper: 350g / m ² PE: 15μm Aluminum foil: 7μm PET: 12μm PE: 60μm PE / paper /
PE / aluminum foil / Dl / PET was laminated on the carton at the stage of lamination, and then the sealant PE was laminated. This example and a material without cutting edge processing were each molded into a carton having a capacity of 1.8 liters to prepare a test sample. The moisture vapor transmission rate and the oxygen transmission rate were measured by the following methods. Moisture Permeability JIS K7129B ASTM F1249 Oxygen Permeability JIS K7126B ASTM D3985-81 The measurement results are shown in Table 1. (Below margin) Clearly from the above results, according to the present invention, the cutting blade to the substrate, perforation, as a web of the portion to be processed such as half-cut, moisture resistance, the decrease in gas barrier property is extremely small, the difference is almost It was found that there was no effect on the storability of the contents.

However, in the case of packaging contents having extremely high hygroscopicity or contents easily affected by oxygen, after the cutting blade is put in the base material, aluminum foil is laminated on the sealant. By sticking the laminated materials together as a sealant, it is possible to obtain a nearly perfect moisture-proof and gas-barrier paper container. However, it is desirable that the thickness of the aluminum foil in this case is approximately 9 μm or less. Also, an easily openable sealed carton by the half cut method as described above may be used.

[Embodiment 1] FIG. 4 shows an embodiment of an easily openable sealed carton according to the present invention. (A) is a perspective view of the easy-open sealed carton according to the present embodiment, and (b) is a plan view thereof. As for the material of the laminated body of the carton used in this embodiment, the embodiment of the present invention based on the material of PE (A) / paper / PE (B) will be described. Using 210 g / m ² coated ball paper, low density polyethylene PE was coated on the surface to a thickness of 30 μm by an extrusion method. Five-color printing was performed on the PE surface by a gravure printing method. Next, a vinylidene chloride (PVDC) -coated polyester film (K-PET 12 μm) was sandwich-laminated with 15 μm polyethylene on the paper surface opposite to the printing surface. Cutting blades C were provided on the front plate 4 and the side plates 3, and polyethylene was coated as a sealant layer to a thickness of 50 μm by an extrusion method.

From the winding thus obtained,
In order to make a blank as a paper container, punching is performed with a punching blade, and at the same time, folding lines are put in necessary parts. As the end surface treatment of the obtained blank, skiving & hemming processing and the like were performed, and a sleeve was prepared by a frame sealer.

Next, the sleeve is set by a filling and packaging machine, is formed, and at the same time, confectionery (karinto) is prepared.
Was filled and hermetically sealed. The unsealed portion of the wrapped paper container could be easily unsealed with the force of fingers.

[Embodiment 2] FIG. 5 is a perspective view (a) and a developed view (b) of a paper container according to this embodiment. The packaging material used was PE / paper / PE / aluminum foil / Dl / PET / PE. The thickness (weight) of each material used was as follows. PE: 20 μm Paper: 210 g / m ² PE: 15 μm Aluminum foil: 7 μm PET: 12 μm PE: 40 μm PE / paper / PE / aluminum foil / Dl / PET When printing on the PE surface at the end of lamination At the same time, from the front side of the carton, a strip-shaped C cutting blade shown in FIG. In the next step, a PE2 sealant layer was provided on the non-printed side of the roll, ie the PET side. PE (is low-density polyethylene, and was provided with a thickness of 40 μm by the melt extrusion coating method. Next, a predetermined crease was provided, punched into a blank, supplied to a packaging machine, filled with a bar biscuit, and then hermetically packaged. The opening band G of C provided as an opening part was removed, the carton upper part was taken out, and the bar biscuit was partly exposed, and it was erected on the tabletop. did it.

[0023]

[Effects of the Invention] A general base material or a base material laminated with a film having a gas barrier property is provided with a cutting blade and perforations, and then a sealant is laminated from the back surface.
The predetermined opening portion is formed, and the opening can be easily performed by the force of only the fingers. Or, after laminating the base material and the sealant, by inserting a half cut from the surface of the base material, it has a sealing property or a gas barrier property, and is an easily openable carton, and most parts of the carton, In addition, it is possible to provide an easily tearable opening of any size, and the contents can be taken out by simply opening it with only your fingers, so that you can start using liquid contents,
It can now be used as a packaging for snacks and dried foods.

[Brief description of drawings]

FIG. 1 is an explanatory view of an easily-openable sealed carton according to the present invention.

FIG. 2 is an explanatory view of another method of the easily openable sealed carton according to the present invention.

FIG. 3 is a plan view of another method of the easily openable sealed carton according to the present invention.

FIG. 4 is a perspective view and a plan view showing an embodiment of an easily-openable sealed carton according to the present invention.

FIG. 5 is a perspective view and a plan view showing a second embodiment of the easily-openable sealed carton according to the present invention.

[Explanation of symbols]

 1 Adhesive Plate 2 Rear Plate 3 Side Plate 4 Front Plate 5 Side Plate 6 Rear Plate 7 Adhesive Plate t Top Plate s Bottom Plate f Top, Bottom Adhesive Plate x Diagonal Rule y Center Rule v Notch E Polyethylene P Paper J Picture C Cutting Blade, Sewing Machine Eye or half cut G Open band K Opening B Barrier layer L Sealant layer

Claims (3)

[Claims] 1. A carton, which comprises a base material and a sealant laminated on each other and is capable of directly packing the contents and having a hermeticity, is cut in advance from one surface of the base material at a position where an opening part of the carton is formed. An easily openable sealed carton, characterized in that a blade or perforation is provided, and then a sealant layer is provided on the other surface of the base material. 2. An easily openable sealed carton, characterized in that, after laminating a base material and a sealant layer, a half cut that does not penetrate the sealant layer is provided from the surface of the base material to form an opening part. 3. A barrier layer is provided as a layer constituting the base material.
The easily openable sealed carton according to claim 1 or 2, comprising at least one layer.