JPH07291349A - Easy-to-open package - Google Patents

Abstract

PURPOSE:To obtain a package that can be easily opened by twisting or pulling and produced at a low cost. CONSTITUTION:An easy-to-open package 1 for packaging a content, consists of a packaging material formed by laminating an outer layer made of a plastic film, an intermediate layer made of an oriented plastic film, and an inner layer made of a heat-sealing plastic. The packaging material is provided with a fine flaw 2 in the outer layer and the intermediate layer and, thereby, can be easily torn by twisting or pulling.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an easily openable package,
The present invention relates to an easily openable package that can be used for packaging contents having various hardnesses and shapes and easily tearing by twisting or pulling the package.

[0002]

2. Description of the Related Art A plastic flat bag, gusset bag or pillow bag is widely used as a package for various foods, pharmaceuticals, cosmetics, batteries, films and the like. These packages are provided with various means for opening them more easily than ever before. For example, a cut tape method, a ring cut method, a double notch method, or the like may be used.

The cut tape method is a method in which a tearing thread or tape is stretched around the opening edge. But,
In this method, the tearing position is predetermined, so it is not possible to change the tearing position one after another in order to take out the individual contents one after another. Further, a member for the cut tape and a supply means are required.

The ring-cut method is a method in which a short ribbon is inserted into the back sticking portion of a package and the sealed portion is heated and unsealed, and the ribbon is opened by rotating the pinched packaging material once. Can be cut into a ring shape and opened. However, this method also has the above problem.

The double notch method is a method in which two notches are provided in the spine sticking part, and the notch can be opened by pinching the intermediate part and pulling. According to this method,
A force pulling the unsealed portion of the spine sticking portion in the direction opposite to the unsealing direction works, and a large force is required in the initial stage. Also,
When the notch is formed in a V shape, the cut dust may be mixed in the contents.

Therefore, an object of the present invention is to provide an easily openable package which can be easily opened by twisting, pulling, tearing or the like and can be manufactured at low cost.

[0007]

As a result of earnest research in view of the above problems, the present inventors have found that when packaging contents by a plastic packaging material, a fine perforation is formed in an outer layer of the packaging material. The present invention has been found out that, if provided, the package can be easily torn by twisting or pulling the package, and the present invention has been made.

That is, the easy-open package of the present invention comprises a packaging material in which an outer layer made of a plastic film, an intermediate layer made of a stretched plastic film, and an inner layer of a plastic having heat sealability are laminated, The outer layer and the intermediate layer of the packaging material are provided with fine perforations, so that the packaging body can be easily torn by twisting, pulling, or the like.

[0009]

The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a perspective view of a pillow package which is a typical example of the easy-open package of the present invention.

The pillow package 1 includes a main body portion 11 for containing contents and two seal portions 12 provided at both ends of the main body portion 11.
It is composed of a and 12b, and the back sticking portion 3 extends in the center of both. The package 1 is provided with fine perforations 2 in advance along a predetermined opening position in the direction perpendicular to the spine sticking portion. The hardness and shape of the contents are not particularly limited.

The packaging body 1 shown in FIG. 1 can be easily opened by, for example, fixing the packaging body 1 with the left hand and rotating the seal portion 12a with the right hand or pulling a part of the perforations. it can. Fine perforation 2 at this time
Along the direction, stress acts in mutually opposite directions and the package 1 starts to tear. Once the tear is made, the tear instantly goes around the main body 11 along the fine perforations 2 and the package 1 is split into two. By repeating this operation one after another, the contents can be sequentially taken out. Also, on the fine perforation 2,
The packaging body 1 can also be opened by pulling the packaging body 1 so that stresses perpendicular to the arrangement direction and in mutually opposite directions act.

As shown in FIG. 2, an example of the packaging material constituting the package 1 is an outer layer 4 made of a plastic film and an intermediate layer 5 made of a stretched plastic film.
And a heat-sealable plastic inner layer 6 are laminated, and the fine perforations 2 are provided in the outer layer 4 and the intermediate layer 5. Fine perforation 2 is several tens of μm
It has a size of ˜several hundred μm, and its shape is not limited to a particular one. The fine perforations 2 may penetrate the outer layer 4 and the intermediate layer 5, but if it is necessary to maintain the sealing property of the packaging material, the inner layer 6 may be formed by extrusion coating of a plastic resin or the like.
Is formed to close the wound, or as shown in FIG. 3, the inner layer 6 is attached by an extrusion coating method, an extrusion laminating method or the like with another base material, for example, a polyethylene layer 8 or the like to close the wound. preferable. Further, when it is necessary to have a high barrier property, it is preferable to provide a barrier layer 7 such as aluminum between the intermediate layer 5 and the inner layer 6 as shown in FIG. An adhesive layer 8 is provided between the intermediate layer 5 and the barrier layer 7.

Further, the fine perforations may be arranged in a line, but a large number of fine perforations may be provided in a constant width if necessary. In this case, the width shall be 20 mm or less. The density of the fine perforations 2 is not particularly limited as long as the package is torn by twisting or the like. Further, considering that the back attachment part 3 has higher strength than the other parts, it is preferable to provide the base part of the back attachment part 3 with fine perforations 2 in order to get over the seal part.

Next, each layer of the packaging material will be described in detail. The outer layer 4 is made of a stretchable film having easy printability. The film may be either a uniaxially stretched film or a biaxially stretched film, and the thickness of the film is preferably 6 to 25 μm.
As the film constituting the outer layer 4, polyester films such as polyethylene terephthalate and polybutylene terephthalate, polyamide films such as nylon,
Polyolefin films such as polypropylene and cellophane are preferred.

The intermediate layer 5 is made of a plastic uniaxially stretched film or a biaxially stretched film. A lateral uniaxially stretched film is preferable, but when a uniaxially stretched film is used as the outer layer, a biaxially stretched film is preferably used. The body 11 is preferably oriented in the lateral direction so that it can be easily torn by twisting, pulling or the like (see FIG. 1). The thickness of the stretched plastic film is 5-50 μm
Is preferred.

Oriented stretched plastic films include polyolefin type, polyamide type,
There are polyvinyl alcohol type and modified polysaccharide type. Polyolefin types include "Balilla" manufactured by Nisseki Koki Co., Ltd., "Calaryan Y" manufactured by Toyo Kagaku Co., Ltd., "YT" manufactured by Toray Co., Ltd., and "Tamai Eagle LS" manufactured by Tamapoly Co., Ltd. , Sanei Chemical Industry Co., Ltd.
"MONOPHANE", Mitsui Toatsu Platec Co., Ltd. "Hybron", Dainippon Plastics Co., Ltd. "CRH", Mitsui Petrochemical Co., Ltd. "Apel", Nippon Zeon Co., Ltd. There are "Zonex" etc. Polyamide types include “ONMI”, “ONMG” and “DCK” manufactured by Unitika Ltd., and “Uniathlon” manufactured by Idemitsu Petrochemical Co., Ltd. Examples of the polyvinyl alcohol composite type include "Embler OV" manufactured by Unitika Ltd.
Examples of the modified polysaccharide type include “cellophane” manufactured by Nimura Chemical Co., Ltd., “K celsi” and “KM celsi” manufactured by Daicel Chemical Industries, Ltd. As the polystyrene composite type, there is "Functional High Stiff Film" manufactured by Nippon Unicar Co., Ltd. and the like.

The outer layer 4 and the intermediate layer 5 are attached to each other by a method such as extrusion coating. At this time, the outer layer 4 and the intermediate layer 5
An adhesive layer may be provided between them.

The inner layer 6 is formed of a heat-sealable plastic resin in order to heat-seal the seal portions 12a and 12b and the back attaching portion 3. Examples of the heat-sealable plastic resin include low-density polyethylene, linear saturated low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ionomer, and polyamide. Inner layer 6
The thickness is preferably 15 to 50 μm.

Depending on the contents, it is necessary to have a light-shielding property and a barrier property. In that case, as shown in FIG. 4, a barrier layer 7 such as aluminum is provided between the intermediate layer 5 and the inner layer 6. preferable. The thickness of the barrier layer 7 is preferably 5 to 30 μm. Further, since the stretched film and aluminum do not have adhesiveness, the adhesive layer 8 is provided between them. Like the inner layer 6, the adhesive layer 8 is formed of low density polyethylene or the like.

Although the present invention has been described in detail with reference to the drawings, the present invention is not limited to this, and various modifications can be made without departing from the concept of the present invention. For example, it can be applied to other packages instead of the pillow package.

The present invention will be described in more detail with reference to the following specific examples. Example 1 Predetermined position of a laminated film composed of a 12 μm-thick polyethylene terephthalate (PET) biaxially stretched film obtained by extrusion coating and a 22 μm-thick polyethylene (OPE) stretched film having lateral uniaxial orientation (Corresponding to a position that is perpendicular to the longitudinal ridgeline when used as a package)
2m / m perforation with a length of about 2m / m
Formed at intervals.

On this laminated film (PET / OPE) having fine perforations, a low-density polyethylene (PE) extruded to a thickness of 15 μm and a low-density polyethylene film (PEF) having a thickness of 30 μm were applied to PET / OPE. / PE /
PEF was laminated in this order to form a packaging material. From this packaging,
The pillow package shown in FIG. 1 was formed.

When the package 1 is fixed with the left hand and twisted so as to rotate the seal portion 12a with the right hand, a tear is generated along the fine perforations 2 provided in the form of a band, and the package is easily opened. We were able to. At this time, the tear did not deviate from the perforations, and the tear was not interrupted at the back attachment part.

Example 2 Polyethylene (OP with a thickness of 15 μm having lateral uniaxial orientation)
A package was formed in the same manner as in Example 1 except that a 25 μm-thick polypropylene (OPP) stretched film having lateral uniaxial orientation was used instead of the E) stretched film. Similar to the packaging body of Example 1, this packaging body could be easily opened, the crevice did not deviate from the perforation, and the crevice was not interrupted at the spine sticking portion.

Example 3 In Example 1, a layer of aluminum foil (Al) having a thickness of 7 μm was provided between a polyethylene stretched film (OPE) having lateral uniaxial orientation and a low density polyethylene (PE) layer. A package was formed in the same manner as in Example 1 except for the above. This package is also the same as the package formed in Example 1,
It was easy to open, the tear did not deviate from the perforations, and the tear did not break at the spine attachment.

[0026]

As described in detail above, since the easy-open package of the present invention is provided with fine perforations, it can be easily opened by twisting or pulling. Such an easy-open package is suitable for packaging so that the contents of various hardness and shapes can be sequentially taken out, and is suitable for packaging various tablets, foods such as snacks, pharmaceuticals, and the like. .

[Brief description of drawings]

FIG. 1 is a perspective view of an easy-open packaging body according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of a layer structure of a packaging material that forms the easy-open packaging body of the present invention.

FIG. 3 is a cross-sectional view showing another example of the layer structure of the packaging material forming the easy-open packaging body of the present invention.

FIG. 4 is a cross-sectional view showing still another example of the layer structure of the packaging material forming the easy-open packaging body of the present invention.

[Explanation of symbols]

 1 ... Easy-open packaging 11 ... Main body 12a, 12b ... Seal 13 ... Longitudinal ridge line 2 ... Fine perforation 3 ... Back sticking part 4 ... Outer layer 5 ... Intermediate layer 6 ... Inner layer 7 ... Barrier layer 8 ... Adhesive layer

Claims (3)

[Claims] 1. An easily openable package for packaging contents, wherein the package has an outer layer made of an easily printable stretched film, an intermediate layer made of the stretched film and an inner layer of a heat-sealing plastic. Characterized in that the outer layer and the intermediate layer of the packaging material are provided with fine perforations, so that the packaging body can be easily torn along the perforations in the previous period. Openable packaging. 2. The easily openable package according to claim 1, wherein the outer layer is made of a stretched film of polyethylene terephthalate. 3. The easily openable package according to claim 1 or 2, wherein the intermediate layer comprises a stretched polyolefin film having a transverse-axis orientation.