JP2602733Y2 - Easy opening bag - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easy-open bag, and more particularly, to an easy-open bag made of a tear-resistant laminated film having an easy-open property.

[0002]

2. Description of the Related Art Conventionally, packaging bags for food, medical products, etc. are made of paper, metal such as aluminum, plastic film such as polyethylene, polypropylene, polyethylene terephthalate, vinyl alcohol copolymer, etc. It was appropriately selected depending on the packaging period, the packaging state, and the like, and was formed by a film laminated by lamination or the like.

However, bags made of the above-mentioned laminated film have a high tear strength, so that it is difficult to open the formed bags by hand, and a jig such as a cutter or scissors is required at the time of opening. .

For this reason, bags which can be easily opened by hand are disclosed in Japanese Utility Model Publication No. 58-33068, Japanese Utility Model Application Laid-Open No. 3-81857, and Japanese Utility Model Application Laid-Open No. 64-42271. A large number of scratches on at least one of the upper and lower ends and both ends of the portion, I-shaped notches, V-shaped notches, cuts the ends into chevron shapes, meandering or oblique directions at the ends of the bag Had a rough surface for opening.

Further, as shown in Japanese Utility Model Laid-Open No. 4-90530 and Japanese Patent Laid-Open No. 4-201867, fine holes are formed in the entire plastic film.

[0006]

However, since a starting portion such as a notch for opening the bag as described above is provided at the end to which the bag is thermally bonded, the starting portion is closed during the thermal bonding. It is difficult to position the start part because the position where the start part is provided changes at the time of formation because the start part is provided at the end of the bag.

[0007] Even if the notch is provided, the bag cannot be cut off according to the use condition because the bag can be opened only from the place where the notch is provided. In addition, when the notch shape is an I-shaped notch, the notch is difficult to find, and when the V-shaped notch is used, the plastic film is cut off, so that the plastic film comes off or the V-shaped notch shape is not completely provided. was there.

[0008] In these techniques, there is a description of a starting portion for opening the bag. However, even if the bag can be easily opened, a plastic film having a high tear strength of the laminated film forming the bag is used. In this case, it is difficult to easily open the bag in accordance with the use condition of the bag even if the end of the bag is cut. In addition, bags molded from plastic films with fine holes
It was vulnerable to shocks and the like, and it was sometimes broken during transportation and storage.

The present invention has been made in order to solve the above-mentioned problem, and a bag which can be easily opened from any position and from any direction without providing a start portion for opening the bag. It is to provide.

[0010]

According to the present invention, there is provided a base material in which an outermost plastic film, a gas barrier layer and an innermost film, which are provided with fine scratches on the entire surface in advance, are laminated in this order. An easily openable bag characterized by the above.

In the present invention, a plastic film having no problem in food hygiene is used. Polyethylene is used because of its good water resistance and thermal adhesion. Polyethylene is a polyethylene layer produced by extrusion. When polyethylene is sandwiched between laminates of other plastic films, it is desirable to have a thickness of 10 to 30 μm.

When polyethylene is present in the lowermost layer as a base film, it is desirable to have a thickness of 20 to 50 μm. This is because if the thickness is less than 20 μm, the properties of the polyethylene cannot be sufficiently obtained, and the polyethylene in the heat-bonded portion at the time of bag production may be completely and surely heat-bonded due to cracking or uneven thickness of the polyethylene. This is because they cannot. An aluminum foil layer, a vacuum-deposited aluminum layer, and a vacuum-deposited silicon oxide layer are used as a gas barrier layer because they have gas barrier properties and ultraviolet impermeability. The polyethylene terephthalate film used for the vacuum-deposited substrate film is used because of its good vacuum-depositability with aluminum and silicon oxide. The metal deposition layer has a thickness of 400
It is desirable to have a thickness of １1500 °. This is 4
When the thickness is less than 00 °, the properties of the above-described metal deposition layer are not generated.

[0013] Unstretched polypropylene is used because it has good heat adhesion and has oil resistance and chemical resistance.
Further, the unstretched polypropylene preferably has a thickness of 20 to 50 μm. This is because if it is less than 20 μm, the properties of the above-mentioned unstretched polypropylene cannot be sufficiently obtained. This is because heat bonding cannot be performed reliably.

[0014] Stretched polypropylene is used because of its high transparency and strength. Polyethylene terephthalate is used because of its high transparency, strength, and heat resistance. Here, when polyethylene terephthalate or stretched polypropylene is used as a surface plastic film having a scratch, it is desirable that each of the plastic films has a thickness of 10 to 30 μm. This is because if the thickness is less than 10 μm, the properties of the above plastic film cannot be sufficiently obtained, and the surface plastic film of the heat-bonded portion at the time of bag production causes film cracking or uneven thickness, and the wound is closed, This is to prevent the bag from being easily cut.

The depth of the scratch provided on the entire surface of the surface plastic film can be 80% from the surface of the surface plastic film to be scratched. This is because, if a deeper flaw is formed on the surface plastic film, the bag may be damaged by impact or the like except when the bag is opened.

The above plastic film and metal foil,
The metal-deposited plastic film is selected and laminated according to the application, and a laminated film is formed. As the plastic film which is the base film of the laminated film and which is the outermost layer film, stretched polypropylene or polyethylene terephthalate is used. Since the stretched polypropylene and polyethylene terephthalate have high strength as described above, the tearing property is weak in ordinary lamination processing and it is not possible to tear by hand, and therefore, a part or the whole of the stretched polypropylene and polyethylene terephthalate is fine. By applying a scratching process, the tearability is enhanced. Therefore, the bag formed of the laminated film can be torn by hand from any direction.

Even if the outermost layer film is damaged, the barrier properties of the bag do not change because the gas barrier layer is laminated. As the plastic film to be the innermost film of the laminated film, polyethylene or unstretched polypropylene is used. This is because each plastic film such as polyethylene and unstretched polypropylene has good thermal adhesiveness and is used as a sealant.

The layer structure of the laminated film of the present invention is polyethylene terephthalate / polyethylene / aluminum foil / polyethylene, polyethylene terephthalate / aluminum foil / polyethylene, polyethylene terephthalate / aluminum foil / unstretched polypropylene, stretched polypropylene / aluminum foil / polyethylene, polyethylene Polyethylene terephthalate / polyethylene with vacuum-deposited terephthalate / aluminum, polyethylene terephthalate / unstretched polypropylene with vacuum-deposited polyethylene terephthalate / aluminum, polyethylene terephthalate / polyethylene with vacuum-deposited stretched polypropylene / aluminum, polyethylene terephthalate with vacuum-deposited stretched polypropylene / aluminum / Unstretched Polypropylene Polyethylene, terephthalate / polyethylene, vacuum-deposited polyethylene terephthalate / silicon oxide, polyethylene terephthalate / polyethylene, vacuum-deposited polyethylene terephthalate / silicon oxide, polyethylene terephthalate / polyethylene, vacuum-deposited polyethylene terephthalate / silicon oxide, stretched polypropylene / oxidized Polyethylene terephthalate / unstretched polypropylene with silicon vacuum deposited,
For example, polyethylene terephthalate / polyethylene.

[0019]

The manufacturing method of the easy-open bag of the present invention is as follows. First, the outermost layer film of the laminated film is made of polyethylene terephthalate or a roller that adheres diamond powder to polypropylene, and the entire surface of the outermost layer film is Scratch. Next, a printing layer made of a pattern, a character, or the like is provided. Next, a plastic film selected according to conditions such as the type of contents to be filled into the easily-openable bag, the storage state, the storage period, and the like is laminated on the side on which the printed layer is laminated to produce a laminated film. A bag as shown in FIG. 2 is manufactured from the manufactured laminated film, and then the contents are filled and thermally bonded, and the easy-open bag is sealed.

Since the above bag has scratches on the entire surface of the bag, the bag can be easily opened at any position during use.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a laminated film according to an embodiment of the present invention;
FIG. 2 is a plan view of an easy-open bag manufactured from the laminated film of FIG. 1, and FIG. 3 is a plan view of a conventional easy-open bag.

<Embodiment> The layer structure of the laminated film of this embodiment is the same as that of the scratched layer (1) /
Polyethylene terephthalate (2) / printing layer (3) / polyethylene (4) / aluminum (5) / polyethylene (6). The total thickness of this laminated film is 74 μm, the thickness of polyethylene terephthalate is 12 μm, the depth of the scratch provided in advance on the entire surface of the polyethylene terephthalate is 9 μm, the thickness of aluminum is 7 μm, The thickness of the polyethylene is 55 μm.

In the manufacturing process of the laminated film of the present embodiment, first, the surface of the polyethylene terephthalate film (2) is roughened by applying diamond powder to the surface of the polyethylene terephthalate film (2). ). The depth of this flaw is 8 μm. Next, a printed layer (3) of a picture or a character is provided on the side having the fine scratches. Then, using polyethylene (4) as an adhesive, polyethylene terephthalate film (1)
The surface on which the printed layer (3) is provided is bonded to aluminum (5). The thickness of the aluminum (5) is 7 μm.

Next, polyethylene (6) is extrusion-coated on the aluminum (5) surface of the laminated film.
The thickness of the polyethylene (6) is 40 μm. Next, an easy-open bag is formed from the produced laminated film, the contents are filled, and the opening is thermally bonded to seal the easy-open bag.

[0025]

As described above, the easy-open bag of the present invention has a scratch on the entire surface of the outermost plastic film of the laminated film forming the easy-open bag. The easy-open bag can be easily torn from any position. Therefore, unlike a conventional easy-open bag, it is not necessary to provide an opening start portion such as an I-shaped notch or a V-shaped notch in the seal portion of the opening, and the labor for providing the opening start portion can be omitted. Further, since the easy-opening bag can be manufactured at any position of the laminated film, the easy-opening bag can be manufactured at low cost.

Since the scratches previously provided on the outermost plastic film are arbitrarily provided on the entire surface, it can be torn at any position of the easy-open bag depending on the use condition of the easy-open bag.

[Brief description of the drawings]

FIG. 1 is a sectional view of a laminated film according to an embodiment of the present invention.

FIG. 2 is a plan view of an easy-open bag manufactured from the laminated film of FIG.

FIG. 3 is a plan view of a conventional easy-open bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Scratch processing layer 2 ... Polyethylene terephthalate layer 3 ... Printing layer 4 ... Polyethylene layer 5 ... Aluminum layer 6 ... Polyethylene layer 7 ... Easy opening part

Claims (1)

(57) [Scope of request for utility model registration] 1. An easy-open bag comprising a base material in which an outermost plastic film, a gas barrier layer, and an innermost film, which are previously provided with fine scratches on the entire surface, are laminated in this order. .