JPH0948471A - Easily openable bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a tear line to propagate in an intended direction for smoothly and reliably opening a bag even in a package which is difficult to open such as a lateral pillow package by making a structure that a wrapping material forming the bag has a lateral monoaxially-stretched film layer and further a notch is provided on a heat-sealing band. SOLUTION: Since a lateral monoaxially-stretched film layer 1c is used as one of layers of a wrapping material 1 forming a bag, a tear line can smoothly propagate in an intended direction. In this case by making a structure that the wrapping material 1 includes the lateral monoaxially-stretched film layer 1c and also an aluminum foil layer 1d, easiness-to-open is more preferable. In particular, by providing a notch 3 on a heat-sealing band at an end piece (especially two lines of notches 3 wherein a distance between the lines decreases in a linear form or a curved form as going deeper in the heat-sealing band), the tear line propagates in an intended direction even in the case of a package difficult to open such as a lateral pillow packaging, so that the bag can be opened smoothly and reliably. This is also applicable to various bags such as normal side-sealed bags.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag which can be easily opened (in particular, a bag for lateral pillow packaging).

[0002]

2. Description of the Related Art Disposable camera (film with lens)
Many of the bags for packaging are provided as horizontal pillow packages. In this case, the heat-sealing band having a chisel structure is located along the center line on the back side of the package. Some manufacturers have a one-wire notch and some have a two-wire notch on this heat-seal band.
Also, there is a heat seal portion at a portion corresponding to the header or the bottom portion with a V-shaped or U-shaped notch.

As in the horizontal pillow packaging, a heat-sealing band having a gas-sealing structure is located along the substantially central line on the back side of the package, and when the heat-sealing band is notched, the heat-sealing band is located. The package is opened by grasping with a finger and tearing the packaging material along the notch.

[0004]

When the heat seal band is notched in the above, the packaging material is torn along the notch, but since the heat seal band has a chisel structure. , The tear stops when the tear line reaches the inner line of the heat seal zone (the base of the gassho structure). Therefore, when the tear has stopped, a strong twisting force is applied to run the tear line in the forward direction and tear the rear side along the inner line of the heat seal band, and then go around the trunk part. To break the bag. As a result, the bag is divided into two, and the camera, which is the object to be packaged, is taken out.

However, when the tear line runs in the forward direction by applying a strong twisting force after the tear line reaches the inner line of the heat seal band, the tear line usually does not run straight. Even if the twisting operation is described in the cautionary note, it is easy to overlook it, so the customer may not be able to open the opening smoothly.

Under such a background, the present invention has an object to provide an easily openable bag which can be smoothly and surely opened even in a package such as a horizontal pillow package which is difficult to be opened. To do.

[0007]

One of the easy-open bags of the present invention is a bag provided with a heat-sealing band (2) on the edge side, and the packaging material (1) constituting the bag is Horizontal uniaxially stretched film layer (1
It is characterized by having c).

Another one of the easy-open bags of the present invention is a bag having a heat-sealing band (2) provided on an edge side, and the packaging material (1) constituting the bag is a lateral uniaxially stretched film. It is characterized in that it has a layer (1c), and further has a structure in which a notch (3) is provided in the heat seal band (2).

The present invention will be described in detail below.

The easy-open bag of the present invention is intended for a bag provided with a heat-sealing band (2) on its edge. The edge side may be a case where the heat-sealing band is located on the side (side) or a case where the heat-sealing band having a chisel structure is located along substantially the center line on the back side of the package as in horizontal pillow packaging. .

In the first easy-open bag of the present invention, the lateral uniaxially stretched film layer (1c) is used as the packaging material (1) constituting the bag.
Is used.

The lateral uniaxially stretched film layer (1c) is a film layer obtained by uniaxially stretching a long film in the width direction, and the material of the film layer is high-density polyethylene,
A polyolefin film such as polypropylene is preferably used. The transverse uniaxial stretching ratio is, for example, about 3 to 10 times. The length direction may be stretched to such an extent that it does not shrink or slightly stretched.

The packaging material (1) comprises a base film layer (1a) and a heat-fusible layer (1) on the inner surface side, together with a lateral uniaxially stretched film layer (1c).
It usually has b). However, base film layer (1a)
Can also serve as the laterally uniaxially stretched film layer (1c).
Examples of the base film layer (1a) are a biaxially oriented polyester film layer, a biaxially oriented polypropylene film layer, a non-oriented polypropylene film layer, a biaxially oriented polyamide film layer, and the like. Examples of the heat-fusible layer (1b) are a low density polyethylene layer, a linear low density polyethylene layer, an ethylene-vinyl acetate copolymer layer and the like.

The packaging material (1) further comprises an aluminum foil layer (1
It is desirable to have d), and it is particularly desirable that the aluminum foil layer (1d) is adjacent to the lateral uniaxially stretched film layer (1c) via an adhesive layer. Aluminum foil layer (1d)
The presence of is more preferable not only for moisture resistance and aesthetics but also for easy tearability.

In addition to the above layers, the packaging material (1) may include an adhesive layer (ad), a vapor deposition layer, an anchor coating layer, a printing layer, etc., and the base film layer (1a). You may have multiple layers.

One of the typical examples of the layer structure of the packaging material (1) is
Base film layer (1a) / adhesive layer (ad) / horizontal uniaxially stretched film layer (1c) / heat-fusible layer (1b), the other one is base film layer (1a) / adhesion Agent layer (ad) / Aluminum foil layer (1d)
/ Adhesive layer (ad) / horizontal uniaxially stretched film layer (1c) / heat-fusible layer (1b). Of course, the layer structure of the packaging material (1) is not limited to these two examples, and various variations are possible.

When opening the first easy-open bag, the heat-sealing band (2) on the edge side may be scratched and then torn. In this case, if the end of the heat-sealing band (2) on the free end side is finely scratched or scratched beforehand, the bag can be torn from any part of the edge and the tear line is heat-sealed. Propagation is almost straight across band (2).

In the case of the horizontal pillow packaging bag, when the tear line reaches the inner line of the heat-sealing belt (the base portion of the chisel structure), it may be pulled as it is or a slight twisting force is applied. The smooth opening can be achieved as compared with the conventional horizontal pillow packaging bag.

In the second easily-openable bag of the present invention, the notch (3) is formed in the heat-sealing band (2) of the first easily-openable bag.
Is provided.

The notch (3) may be a one-wire type or a two-wire type, but in the case of a horizontal pillow packaging bag, the two-wire type is preferable. The notch (3) may be provided substantially across the heat seal band (2), or may be provided halfway along the heat seal band (2). In addition, in order to prevent accidental tearing from the notch during the distribution process, the notch (3) is provided so as to start slightly (about 1 to 2 mm) from the inside of the outer end of the heat seal band (2). You can also

In the case of the two-wire type notch (3), the two wires may be parallel lines, but as the space between the heat-sealing strips (2) is closer to the inside, the two lines become linear or curved. It is preferable that the notch becomes narrower. Figure 6 shows a heat-sealed strip (2)
It is an explanatory view when a two-wire type notch (3) is provided in
(A) and (b), if a linear two-wire notch (3) where the distance between the lines becomes narrower is provided, (c) and (d)
Is a curved two-wire notch (3) that gradually becomes narrower between lines
If (e) and (f) are provided with parallel wire two-wire notches (3), (e) and (h) are provided with notches (3) in the heat seal band (2). Each case is shown such that it is provided so as to start slightly inside from the outer end.

The easy-open bag of the present invention is particularly useful as a bag for lateral pillow packaging, particularly as a bag for disposable camera packaging. The present invention is not limited to this, and can be applied to various bags such as a normal side seal bag.

[0023]

[Function] In the easy-open bag of the present invention, the tear line is intended because the lateral uniaxially stretched film layer (1c) is used as one layer of the packaging material (1) that constitutes the bag. Propagate smoothly in the direction. In this case, when the packaging material (1) includes the laterally uniaxially stretched film layer (1c) and the aluminum foil layer (1d), the easy-opening property becomes more preferable.

[0024] Especially, the notch is formed in the heat seal band (2) at the edge.
(3) (In particular, a two-wire notch (3) in which the distance between the lines narrows linearly or curvedly toward the inner side of the heat-seal zone (2)
), Even in a package which is difficult to open, such as a horizontal pillow package, the tear line propagates in the intended direction, and the smoothness of opening becomes very favorable.

[0025]

EXAMPLES The present invention will be further described with reference to examples.

Example 1 FIG. 1 is a view of the back side of the easily-openable bag according to the present invention as seen from slightly frontward. FIG. 2 is an explanatory view showing a state in which the easy-open bag of FIG. 1 is opened.

The base film layer (1a) is a biaxially stretched polyester film having a thickness of 12 μm, the heat-fusible layer (1b) on the inner surface side is an extrusion coating layer of an ethylene-vinyl acetate copolymer having a thickness of 30 μm, and a lateral uniaxial stretching. The film layer (1c) is a 20μm thick horizontally uniaxially stretched high density polyethylene film layer, the aluminum foil layer (1d) is a 7μm thick aluminum foil, and the adhesive layer (ad) is a dry-laminated polyurethane adhesive layer with a thickness of 1μm. Agent layer (1a) / (ad) / (1d) / (ad) / (1c) / (1
The packaging material (1) having the layer structure of b) was prepared.

Using this packaging material (1), a lateral pillow packaging bag was made as shown in FIG. 1, and a disposable camera was also packaged. A heat-sealing band (2) with a gassho structure is located along the center line on the back side of the package, and the heat-sealing band (2) is located inside the heat-sealing band (2). A two-wire notch (3) was provided that narrowed the distance between the lines linearly.

As shown in FIG. 2, when the heat seal band (2) on the back side of the package is grasped and pulled between the two-wire notches (3) of the heat seal band (2), a tear line is formed on the heat seal band (2). Since it propagates beyond the inner line (the base of the chisel structure) (when the inner line is reached, it is pulled strongly or a slight twisting force is applied), so that the bag can be broken by going around the body as it is. As a result, the bag is divided into two, and the camera, which is the object to be packaged, can be taken out.

Example 2 FIG. 3 is a view of the back side of the easily-openable bag of the present invention viewed from slightly above the front side. FIG. 4 is an explanatory view showing a state when the easily openable bag of FIG. 3 is opened.

The base film layer (1a) is a biaxially oriented polypropylene film having a thickness of 20 μm, and the heat-fusible layer (1b) on the inner surface side.
Is an extrusion coating layer of low-density polyethylene with a thickness of 40 μm,
The lateral uniaxially stretched film layer (1c) is a laterally uniaxially stretched high density polyethylene film layer having a thickness of 18 μm, and the adhesive layer (ad) is a low density polyethylene layer having a thickness of 15 μm formed by extrusion coating (1a) / (ad) / A packaging material (1) having a layer structure of (1c) / (1b) was prepared.

Using this packaging material (1), lateral pillow packaging bags were made as shown in FIG. 3 and disposable cameras were also packaged. A heat-sealing band (2) with a gassho structure is located along the center line on the back side of the package, and the heat-sealing band (2) is located inside the heat-sealing band (2). A two-wire notch (3) with a narrower curve was provided.

As shown in FIG. 4, when the user grasps and pulls between the two-wire type notches (3) of the heat-sealing band (2) on the back side of the package, the tear line of the heat-sealing band (2) is formed. Since it propagates beyond the inner line (the base of the chisel structure) (when the inner line is reached, it is pulled strongly or a slight twisting force is applied), so that the bag can be broken by going around the body as it is. As a result, the bag is divided into two, and the camera, which is the object to be packaged, can be taken out.

Embodiment 3 FIG. 5 is a front view showing still another example of the easy-open bag of the present invention.

This bag is a normal side-seal bag prepared by using the same packaging material (1) as in Example 1, in which the one-sided notch (3) is provided in the heat-sealing band (2) on one side. is there. If the bag is torn from the notch (3), the tear line propagates laterally accurately even if the notch (3) is located near the opening, and the opening can be smoothly performed.

[0036]

EFFECTS OF THE INVENTION In the easy-open bag of the present invention, even in a package such as a horizontal pillow package which is difficult to open, the tear line propagates in the intended direction, and the bag can be opened smoothly and reliably. it can. Therefore, the easy-open bag of the present invention is extremely practical.

[Brief description of drawings]

FIG. 1 is a view of a back side of an easily-openable bag of the present invention viewed from a slightly front side.

FIG. 2 is an explanatory view showing a state in which the easy-open bag of FIG. 1 is opened.

FIG. 3 is a view of the back side of the easily-openable bag of the present invention seen from slightly frontward.

FIG. 4 is an explanatory view showing a state in which the easy-open bag of FIG. 3 is opened.

FIG. 5 is a front view showing still another example of the easy-open bag of the present invention.

FIG. 6 is an explanatory view when a two-wire type notch (3) is provided on the heat seal band (2).

[Explanation of symbols]

 (1) ... packaging material, (1a) ... base film layer, (1b) ... heat-fusible layer, (1c) ... lateral uniaxially stretched film layer, (1d) ... aluminum foil layer, (ad) ... adhesive Agent layer, (2)… Heat seal band, (3)… Notch

Claims (9)

[Claims] 1. A bag having a heat-sealing band (2) provided on an edge thereof, wherein a packaging material (1) constituting the bag has a lateral uniaxially stretched film layer (1c). Openable bag. 2. A packaging material (1) comprises a base film layer (1a) and a heat-fusible layer (1b) on the inner surface side, and a lateral uniaxially stretched film layer (1).
The easily openable bag according to claim 1, which has c). 3. A packaging material (1) comprises a base film layer (1a), an inner surface heat-fusible layer (1b) and an aluminum foil layer (1d) together with a lateral uniaxially stretched film layer (1c). The easily openable bag according to claim 1, which has. 4. A bag provided with a heat-sealing band (2) on an edge side, wherein a packaging material (1) constituting the bag has a lateral uniaxially stretched film layer (1c), and the heat-sealing is further provided. An easily-openable bag having a structure in which a notch (3) is provided on the belt (2). 5. A packaging material (1) comprises a base film layer (1a) and a heat-fusible layer (1b) on the inner surface side, and a lateral uniaxially stretched film layer (1).
The easy-open bag according to claim 4, which has c). 6. A packaging material (1) comprises a base film layer (1a), a heat-fusible layer (1b) on the inner surface side, and an aluminum foil layer (1d) together with a lateral uniaxially stretched film layer (1c). The easily openable bag according to claim 4, which has. 7. The notch (3) is a two-wire notch.
7. The easy-open bag according to any one of 1 to 6. 8. The easy-open property according to claim 7, wherein the notch (3) of the two-wire type is a notch in which the distance between the notches (3) narrows linearly or curvedly toward the inner side of the heat-sealing band (2). bag. 9. The easily openable bag according to claim 1, which is a bag for lateral pillow packaging.