JP2001225850A - Easily unsealable bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easily unsealable bag capable of being favorably torn and opened to the end thereof. SOLUTION: The easily unsealable bag contains contents in a space between two sheet materials opposed to each other and has a tear line 52 provided along the vicinity of at least one side edge of the bag. The tear line 52 is formed by many semicircular cut lines 53 linearly joined to one another at predetermined intervals. Each semicircular cut line 53 is so arranged that both ends 53a, 53b thereof are set in a direction in which they become apart from the side edge 51 of the bag. It is preferable to provide the tear lines 52 in plural rows. It is also preferable that a weakened part 55 for making the start of an unsealing operation easier is provided at a portion of at least one end of the tear line 52.

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 which can be easily opened by tearing a side end of the bag along a tear line.

[0002]

2. Description of the Related Art Conventionally, an easy-open bag provided with a tear line serving as a guide for tearing when the bag is opened has been used as a packaging bag for packing compresses, confectionery and the like. Various proposals have been made. The easy-open bags 10 and 20 shown in FIGS. 1 and 2 are merely examples, each of which is formed by accommodating contents between two opposing sheet materials and thermally bonding four sides. Each bag has one edge 11, 21
A dashed line extending substantially parallel along the edge near
12, 22 are formed. Each break line 12, 22 is constituted by a large number of cuts 13, 23 arranged at regular intervals, as shown in an enlarged manner in the figure.

A drawback common to these bags 10, 20 is that the cuts 13, 23 that make up the break lines 12, 22 "have a directional component 13a, 23a extending toward the edges 11, 21 of the bag. Is there. " If each cut has such a directional component directed toward the outside of the bag, the following disadvantages occur.

That is, as shown in FIG. 3, when a user actually tears open a bag by tearing the bag, before the user completely opens the bag along the tear line due to the influence of the direction component toward the outside of the bag of each cut. Then, the tear piece 30 held in the hand is torn off toward the bag edge (FIG. 3B). Also, the cut after opening has a sharp shape, and the appearance is not good. Furthermore, FIG.
As shown in the above, when the sheet material is wound on a take-up roll during the manufacturing process of the sheet material constituting the bag, the tension acting on the sheet material also causes a problem that a tear 41 occurs at the bag edge. is there. In FIG. 4, cuts and tears are exaggerated for ease of understanding.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and provides an easy-open bag having the following features.

That is, the easy-open bag of the present invention contains the contents between two opposing sheets, and has a break line near at least one side edge.
The breaking line is formed by connecting a large number of semicircular cuts in a straight line at regular intervals, and each semicircular cut is arranged with its both ends facing away from the side edge.

When the cuts are arranged as described above, when the user breaks the bag and opens it, a force having a directional component toward the inside of the bag is generated by each cut. By the interaction of this force and the force that goes to the outside of the bag due to the user's opening operation,
A resultant force is generated in the direction in which the breaking line extends, and as a result, it is possible to satisfactorily break open along the breaking line. Furthermore, each cut is a "directional component extending toward the bag edge."
Therefore, when the sheet material is wound around the take-up roll during the manufacturing process of the sheet material constituting the bag, the bag edge does not tear due to tension.

[0008] In the easy-open bag of the present invention, it is preferable to provide a plurality of rows of the breaking lines. When such a configuration is employed, in the bag manufacturing process, when two opposing sheet materials are arranged to face each other, even if there is a slight deviation in the relative position between the two sheets, the deviation is absorbed. be able to.

Further, at least one end of the breaking line,
By providing a weakening portion for facilitating the start of opening, the opening start operation can be facilitated.

[0010]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 5 is a partially cutaway view showing a region near the tear line in the easy-open bag 50 according to the embodiment of the present invention. The configuration of the entire bag and the position of the break line are the same as in the case of the conventional example shown in FIGS.

A large number of cuts 53 arranged linearly at intervals form one break line 52. Each cut 53 is semicircular, with both ends 53a, 53b facing inward of the bag.
(That is, in a direction away from the bag edge 51). The effect of arranging the cuts 53 in this manner will be described below with reference to FIG. In FIG. 5 and FIG. 6, each cut is drawn larger than the actual cut. Although the actual size of each cut is not particularly limited, in FIG. 6, the length m in the extending direction of the breaking line is 2 mm, the interval n between the cuts is 1 mm, and the radius r is about 1.5 mm. is there.

When the user tears open the bag 50, a force is applied to the outside of the bag as shown by an arrow a in FIG. Therefore, as in the case of the conventional example of FIG. 3, it seems that there is a tendency that the broken pieces tend to be torn off before the seal is completely opened. However, in the present invention, unlike the conventional example, each cut 53 constituting the break line 52 does not have a "direction component toward the outside of the bag (that is, a direction component toward the bag edge 51)". Specifically, each semicircular cut 5
3 is arranged with both ends 53a and 53b facing the inside of the bag, so that when the user tears open the bag, each cut 53 generates a force in the direction indicated by arrow b in FIG.

The interaction of the two forces results in a resultant force A in the direction in which the tear line 52 extends. As a result,
In the easy-open bag 50 of the present invention, it is possible to tear open along the tear line 52 to the end. Further, as can be seen from FIG. 6, since the cut is formed by a large number of continuous arcs, the cut has a better appearance than the conventional product. It should be noted that the term “semicircle” in the present invention does not mean an exact semicircle. For example, as long as the same effect as described above can be obtained, for example, an arc or an ellipse that is ３ of a perfect circle may be used. included.

Further, as can be seen from FIG.
Does not have a “direction component extending toward the bag edge 51”, so that when the sheet material is wound on a take-up roll during the manufacturing process of the sheet material forming the bag, tension is applied to the bag edge 51. No tearing occurs.

As shown in FIGS. 5 and 6, a weakened portion 55 composed of a large number of fine holes is formed at the left end of the breaking line 52. The 55 parts of the weakening are for facilitating the start of opening the bag. In the drawing, the weakened portion 55 is provided only at one end of the broken line 53, but it is of course possible to provide weakened portions at both ends. The overall shape of the weakened portion 60 is substantially triangular in the illustrated example, but the shape is not particularly limited and may be, for example, a U-shape. It is preferable that each micropore constituting the weakened portion 60 has a diameter of about 0.3 to 2.0 mm and an interval of about 0.3 to 2.0 mm.

FIG. 7 shows an easy-open bag according to a second embodiment of the present invention. This embodiment is different from the first embodiment in that the breaking lines 62 are formed in two rows. When the broken lines 62 are arranged in two rows in this manner, the following advantages can be obtained. That is, when manufacturing a bag, two sheet materials are opposed to each other and the periphery thereof is bonded. In order to open the bag easily, it is necessary that both sheet materials face each other with the positions of the break lines as accurately as possible, but it is natural that the relative positions of both sheet materials will be shifted. Is assumed. However, if the break lines 62 are provided in two rows, the above-described relative position deviation can be absorbed by the width of the break area. Such an effect can be further enhanced by increasing the number of broken lines.

Although not shown in FIGS. 1 to 6, naturally, the break lines are formed on both of the two opposing sheets. Although not specifically described in the present embodiment,
For bags whose contents are poultices and the like and are repeatedly used for opening and closing, between the dashed line and the side edge positioned parallel to this, a concave and a convex ridge that fits each other. The constituted resealing chuck (clamping tool) may be formed in parallel with the breaking line.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a conventional easy-open bag.

FIG. 2 is a schematic view showing another example of a conventional easy-open bag.

FIG. 3 is a schematic view for explaining a drawback of a conventional easy-open bag.

FIG. 4 is a schematic view for explaining a drawback of a conventional easy-open bag.

FIG. 5 is a schematic diagram illustrating an easy-open bag according to the first embodiment of the present invention.

FIG. 6 is a schematic diagram illustrating the principle of opening the easy-open bag of FIG. 5;

FIG. 7 is a schematic diagram illustrating an easy-open bag according to a second embodiment of the present invention.

[Explanation of symbols]

 10, 20 Easy opening bag 11, 21 Bag edge 12, 22 Break line 13, 23 Break 30 Break piece 41 Tearing 50 Easy opening bag 51 Bag edge 52, 62 Break line 53 Cut 55 Weakened part

Claims (3)

[Claims] 1. An easy-open bag containing contents between two opposed sheet materials and having a break line (52) along the vicinity of at least one side edge (51), Above break line (52)
Is formed by connecting a large number of semicircular cuts (53) linearly at regular intervals, and each semicircular cut (53) is formed at both ends (53
a, 53b) is arranged facing away from the side edge (51). 2. The easy-open bag according to claim 1, wherein a plurality of break lines are provided. 3. The easy-opening bag according to claim 1, wherein a weakened portion (55) for facilitating the start of opening is provided at at least one end of the breaking line (52).