JPH05178352A - Emily openable sealed bag - Google Patents

Abstract

PURPOSE:To make it possible to tear a sealed bag made of a plastic film easily from an optional location. CONSTITUTION:For a sealed bag 1A made of a film 2, sealing parts 3a on both sides are formed at a location which is away from the outer edge 2a of the film, and at the outside of the sealing parts 3a, film outer edge parts 2b, 2b, which are not bonded, are left, and a scar group 4 which has numerous scars in a band shape is formed at the film outer edge part 2b, and the film outer edge parts 2b, 2b are made tearable from an optional location. In this case, since the scar group 4 is formed on the film outer edge parts 2b, 2b which are soft and not bonded, tearing can be easily started.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed bag made of a plastic film, and more particularly to an easily opened sealed bag which can be easily opened.

[0002]

2. Description of the Related Art In general, a sealed bag made by folding or superposing plastic films having high breaking strength and sealing the overlapping portions of the outer edges thereof is widely used. A sealed bag made of such a film with high breaking strength is difficult to tear as it is, so it is difficult to open it by hand, and it is usually cut into the seal part (I notch).
And V-notch is done. However, such a notch and a V notch are troublesome to process, and have the drawback that the sealed bag can only be opened at that position.

Therefore, as a solution to these drawbacks, a large number of scratches are formed on the film in a strip shape, and the film is slit so that the portion forming the scratches becomes the outer edge during bag making. In addition, an easily openable sealing bag has been proposed in which the portion is sealed to form a sealing bag and the sealing bag can be torn from any position of the sealing portion with fingers (for example, Japanese Patent Laid-Open No. 61- 60469, JP-A-61-142159, JP-A-62-52065).

[0004]

However, in the conventional easily openable sealing bag, the tearability at the tear start portion is poor, and therefore, even if a large force is applied to the tear start portion, it is difficult to tear. In addition, since the tearing point easily progresses after the tearing starts, there is a problem that the contents are scattered around due to the momentum.

The reason why it is difficult to start tearing in a conventional sealed bag is considered as follows. That is, in the conventional sealed bag, a group of scratches for starting tearing is present in the seal portion, but the seal portion is hard because two films are overlapped and welded, and therefore the portion is torn. Because of this, it was difficult to twist with fingers, and eventually it was difficult to start tearing. Further, since the seal portion is formed by welding two films (for convenience, a front film and a back film) in an overlapping manner, when tearing the seal portion, the tear starting point (starting point of action) is the front film, Both back and back films need to be in the same position, but the probability that scratches that could act as starting points for the front and back films will overlap is 0.
Therefore, when tearing starts from one of the scratches on the front film, the tearing must start from a position without scratches on the back film, which is also difficult to start tearing. Furthermore, when the orientation direction (stretching direction) of the film used is not at right angles to the outer edge of the seal portion, the orientation directions of the front film and the back film that overlap in the seal portion intersect, and therefore the same tear When tearing from the starting point, the front and back films try to cut in different directions (orientation directions),
Since both films are fixed by welding, they are difficult to tear, and particularly when the crossing angle of the orientation directions becomes large, the tearability becomes extremely poor.

In order to improve the deterioration of tearability due to the intersection of the orientation directions, as a film forming a sealing bag, the oriented portions on both sides of the stretched film are removed so that the orientation direction becomes the longitudinal direction. It is sufficient to use the central portion of the stretched film, but in that case, the portions on both sides of the stretched film cannot be used, and there is a problem that the loss of the film becomes large.

The present invention has been made in view of the above conventional problems, and can be easily opened without forming a notch or a V notch, and a stretched film can be used without causing much loss. An object is to provide an easily openable sealed bag that can be configured.

[0008]

In order to solve the above-mentioned problems, the present invention provides a sealing bag made of a film having at least a base material layer and an adhesive layer, in which at least one sealing portion is superposed on the outer edge of the film. Therefore, it is said that the non-adhesive film outer peripheral portion is present outside the sealing portion, and a scar group having a large number of scars is formed on the non-adhesive film outer peripheral portion. It is configured.

The film used in the present invention comprises at least a base material layer (base material film) having necessary strength and barrier properties, and an adhesive layer for enabling welding. As the base material layer, PET, ON, OPP,
Known stretched films of plastic such as HDPE can be used. Any adhesive layer may be used as long as it can be welded, and LDPE, MDPE, PP, EVA, EAA,
A known thermoplastic resin such as an ionomer can be used. These laminations can be dealt with by extrusion coating after anchor coating on the base film. Further, a uniaxially stretched film may be further laminated for the purpose of improving the easy-open property.

The form of the sealed bag used in the present invention is as follows.
Various bags such as a four-sided sealed bag, a three-sided sealed bag, a pillow bag, and a stick bag can be used. The present invention, in these hermetic bags, at least one seal portion is formed at a position away from the outer edge of the superposed films, and a large number of scratches are formed on the non-adhesive film outer edge portion outside the seal portion. This is a group of scars. Hereinafter, examples of specific structures of these sealed bags will be described with reference to the drawings.

FIG. 1 shows an easily openable sealed bag 1A according to an embodiment in which the present invention is applied to a four-sided sealed bag. This easily opened and sealed bag 1A is a film 2 having a base material layer and an adhesive layer.
On top of each other, and seal parts 3a on the left and right sides,
A sealing bag is formed by forming the seal portions 3b on the upper and lower sides, respectively. Of the seal portions on the four sides, the seal portions 3a on the right and left sides are formed at positions apart from the outer edge 2a of the film 2. Outside the seal portion 3a, the non-adhesive film peripheral portions 2b and 2b are left. Then, a band 4 of scratches having a large number of scratches imparting easy-opening property is formed on each of the two film peripheral portions 2b, 2b on the front and back sides.

FIG. 2 shows an easily openable sealed bag 1B according to an embodiment in which the present invention is applied to a three-sided sealed bag. The easy-open sealing bag 1B is a bag in which the film 2 is folded and the three sides other than the folds are sealed to form a sealing bag. One of the sealing portions 3a and 3b on the three sides is one sealing portion 3a. Is formed at a position distant from the outer edge 2a of the film 2, and the non-adhesive film outer edges 2b and 2b are left outside the seal portion 3a. And this table,
A scratch group 4 having a large number of scratches imparting easy-opening property is formed on each of the outer two film peripheral portions 2b, 2b.

FIG. 3 shows an easily openable sealed bag 1C according to an embodiment in which the present invention is applied to a pillow bag. This easy-open sealing bag 1C is a bag in which the film 2 is folded and the back and upper and lower ends are sealed to form a sealed bag. The back seal portion 3a is formed at a position away from the outer edge 2a of the film 2. Outside the seal portion 3a, the non-adhesive film peripheral portions 2b and 2b are left. Then, on the front and back sides of the two film outer edges 2b, 2b,
A scar group 4 having a large number of scars imparting easy opening property is formed.

In the present invention, the film outer peripheral portions 2b, 2
The scratch group 4 formed in b may have a large number of scratches that can be the origin of tearing, and as shown in FIG. 3, in the film 2 including the base material layer 6 and the adhesive layer 7, It may consist of minute scratches 4a formed over both layers, or as shown in FIG. 4, it may consist of minute scratches 4b formed only on the base layer 6. Here, the minute scratches 4a are not limited to those that completely penetrate the film 2, but may be those that do not penetrate, or those that both penetrate and do not penetrate. Further, the minute scratches 4b may also be those that completely penetrate the base material layer 6, those that do not penetrate, or a mixture of both.

These scratches 4 are usually formed before the bag making process. As a method for processing the scratches, a method for processing only the base material layer (base material film) before laminating or the film after laminating with a sewing blade, saw teeth, or a surface provided with fine particles is used. In addition to the method of crimping, the method of sandblasting, the method of crimping a wire brush, etc., laser processing, corona discharge, plasma discharge, etc. can also be used. Alternatively, the laminated film may be formed by slitting the film into a desired bag size and blasting the end surface thereof.

[0016]

In the easily openable and sealed bag of the present invention, as shown in the embodiments of FIGS. 1 to 3, the scratches 4 are formed on the two non-adhesive film peripheral portions 2b and 2b located outside the seal portion 3a. Therefore, at the time of unsealing, the unsealing can be easily performed by tearing any position of the outer side portions 2b, 2b having the scratch group 4 at the time of unsealing. At this time, at the tearing start point, since both the film outer peripheral portions 2b and 2b are not adhered to each other, they are flexible, and the tearing can be easily started by twisting them with fingers. Further, the tearing start points of the film outer edges 2b and 2b do not necessarily have to be exactly the same, and therefore, it is possible to set the scratch starting points to the adjacent scratches of the film outer edges. Easy to start tearing. Further, once the tearing is started, the force is concentrated at the cutting action point, so that the tearing can be easily progressed, and even if the orientation directions of the two films adhered by the seal portion 3a intersect each other. Since it is possible to tear the film across the sealed portion without any trouble, it is not necessary to accurately adjust the orientation direction of the film used for the sealing bag, and most of the stretched film can be effectively used.

[0017]

Example A polyester film T4100 having a thickness of 12 μ (manufactured by Toyobo Co., Ltd.) is prepared as a base material film constituting a base material layer, and the treated surface of the polyester film is subjected to a printing / makeup treatment and a urethane anchor coat After roll-coating the agent Coronate L (manufactured by Nippon Polyurethane Co., Ltd.), extrusion lamination was performed using LDPE M11P (manufactured by Mitsui Petrochemical Co., Ltd.) having a thickness of 30 μm. After that, a penetrating scar was formed by a saw-tooth blade for cutting. This film was cut and overlapped so that the penetrating scratches were at both ends, and the inner side of the penetrating scratches was sealed slightly to prepare a four-sided sealing bag 1A shown in FIG.

For comparison, the same film is cut and overlapped so that the penetrating scratches are at both ends, the positions of the penetrating scratches are sealed, and a four-side seal bag (comparative example) is used.
It was created.

When these four-sided sealed bags were checked for unsealing ability with fingers, the comparative bag could not be opened because the resistance at the sealing portion was large, but the bag 1A according to this embodiment could be easily opened. It was By the way, T4100 used as the base material layer is not a raw film in which the orientation direction is adjusted such that only the central portion of the stretched film is used as the film.

[0020]

As described above, the easy-open sealed bag of the present invention is
A non-adhesive film outer edge is formed on the outside of the seal part, and a scratch group having many scratches for tear initiation is formed in that part, so tearing can be started very easily from the film outer edge. Further, it is not necessary to arrange the orientation direction as a base film, and therefore, there are no restrictions on the production of the base film, the loss amount of the film can be reduced, and the starting point of opening is clarified visually. It has the effect of making it easier to open.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an easily openable and sealed bag according to an embodiment of the present invention with a part thereof cut away.

FIG. 2 is a schematic perspective view showing an easily openable and sealed bag according to another embodiment of the present invention with a part thereof cut away.

FIG. 3 is a schematic perspective view showing an easily openable and sealed bag according to still another embodiment of the present invention with a part thereof cut away.

FIG. 4 is a schematic cross-sectional view showing an enlarged cross section of an example of a film used in the above examples.

FIG. 5 is a schematic sectional view showing an enlarged section of another example of the film used in the above-mentioned embodiment.

[Explanation of symbols]

 1A, 1B, 1C Easily opened and sealed bag 2 Film 2a Outer edge 2b Film outer edge 3a, 3b Sealed portion 4 Scar group 4a, 4b Small scratch 6 Base material layer 7 Adhesive layer

Claims (1)

[Claims] 1. A sealing bag made of a film having at least a base material layer and an adhesive layer, wherein at least one seal portion is formed at a position separated from an outer edge of the film,
An easily openable and sealed bag, characterized in that scratches having a large number of scratches are formed on each of two non-adhesive film peripheral portions located outside the sealing portion.