JPH078265U - Easy tear packaging bag - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention has been made to solve the above-mentioned problems. It improves work efficiency when pouring contents, and has excellent strength and impact resistance, and is easy to use. The present invention provides a bag formed of a laminated material that can be opened at any position. [Structure] In a bag made of a tearable laminated material,
It is characterized in that an unheated tear portion is provided between the upper side heat-bonded portion and the band-shaped heat-bonded portion by providing the band-shaped heat-bonded portions from both sides leaving an opening below the upper-side heat-bonded portion. It is an easily tearable packaging bag.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bag which can be easily torn and opened for refilling or for one-time use juice, noodle juice, liquid foods such as sauce and soy sauce, or liquid detergent.

[0002]

[Prior art]

 Conventionally, flat bags and self-supporting bags made of laminated materials have been used in many fields such as food, medicine and agriculture. In addition, due to environmental problems, the bag has been used as a container for refilling contents in recent years.

This bag has been used by being torn and opened by an opening start portion such as an I-shaped notch or a V-shaped notch provided on a side edge.

However, in the conventional bag, the opening formed by tearing the bag at the time of use has almost the same width as the width of the bag. Therefore, when pouring the contents into a container or the like, the opening is too wide and stable. Without it, the contents could not be easily poured. Alternatively, it was possible to stop the tearing opening halfway and narrow the opening, but the part that was torn up partly interferes with the filling of the contents and the contents cannot be filled easily. It was

In order to solve the above problems, a bag in which the width of the heat-bonding portion of the upper heat-bonding portion has been widened has been devised, such as the bag shown in FIG. In this bag, the opening created by tearing the heat-bonded part during use is smaller than the width of the bag, which improves the stability during use of the bag and makes it easier to pour the contents in order to solve the above problems. It was done.

[0006]

[Problems to be solved by the device]

 However, even if it is a commonly used laminated material that has an easy-to-open property and is oriented, a slight misalignment in the direction of stretching may cause misalignment between the front and back sides of the tear line during tearing. Could not be poured easily. Further, when the heat-bonded portion is widened as in the above-mentioned bag, the stretched orientation of the laminated material is disturbed by the heat of the heat-bonding, and the tear strength of the heat-bonded portion is increased, so that it cannot be easily torn.

If a bag is formed of a laminated material that is highly tearable even if it is heat-bonded, even if the bag is easily torn during use, it has low impact resistance, strength, etc. Sometimes the bag was torn due to vibration. In addition, if a bag is formed from a laminated material with high impact resistance and strength, the heat-bonded part cannot be easily torn, and tools such as cutters and scissors must be used, resulting in poor work efficiency. And even if it did, I couldn't tear it straight.

On the other hand, even if a bag is formed by using a laminated material having good tearability, high impact resistance, high strength, etc., the heat-bonded portion is not easily torn because the stretched orientation is disturbed and weakened as described above. , I could not solve the above problem.

The present invention has been made to solve the above-mentioned problems, and improves the work efficiency when pouring contents, is excellent in strength and impact resistance, and is a laminated material that can be easily opened during use. A more shaped bag is provided.

[0010]

[Means for Solving the Problems]

 The present invention is a bag made of a tearable laminated material that is heat-bonded on all sides, and by providing a band-shaped heat-bonding part with an opening below the upper-side heat-bonding part, the top-side heat-bonding part and the band-shaped heat-bonding part are provided. The tearable packaging bag is characterized in that a tear portion in a non-heat-bonded state is provided between them.

[0011]

[Action]

 The bag of the present invention is opened from the opening start portion. The tear line passes through the tear part provided between the upper heat-bonded part and the band-shaped heat-bonded part and is torn to the opposite side. Even if the tear line is bent, the upper side heat-bonded part and the band-shaped heat-bonded part are heat-bonded to each other, so that the tear line is less tearable than the tear part and is hardly torn. Therefore, the tear line is torn along the upper side heat-bonded part or the band-shaped heat-bonded part, so that it does not bend beyond the width of the tear part and the tear line is torn substantially linearly.

Further, since the opening is formed narrower than the width of the bag by the band-shaped heat-bonding portion, the bag can be used in a stable state. Since the size of the opening can be changed depending on the length of the band-shaped heat-bonding portion, the opening can be easily molded according to the usage state.

[0013]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a perspective view of the embodiment of FIG. 1, FIG. 3 is a plan view of a conventional bag, and FIG. 4 is a plan view of another embodiment of the present invention. is there.

The synthetic resin film used in the laminated material of this example is polyethylene terephthalate, tearable nylon, tearable polypropylene, low density polyethylene, or polyethylene terephthalate. Nylon and polyethylene terephthalate are synthetic resins with high strength, impact resistance, cold resistance, etc. Also, since they are films with high printability, they are used for the outer layer. Both nylon and polyethylene terephthalate stretched films are used.

Tearable nylon is a film that is strongly stretched and oriented in one direction, and is a nylon film that is easily tearable in the strong stretching direction. Tearable polypropylene is a polypropylene film that is strongly stretched and oriented in one direction, and has a property of being easily torn in the strong stretching direction. Low-density polyethylene is used as an inner layer because it has good thermal adhesiveness, high sealing strength, and high impact resistance.

When laminating the films, it is preferable to form the laminating material so that the synthetic resin film having high tearability and the synthetic resin film having low tearability are adjacently laminated. This is because when a tearing force is applied, the synthetic resin film, which has high tearability, is stretched in the tearing direction, so force is applied in the tearing direction, and even a synthetic resin film with low tearability can be torn in only a certain direction. This is because the synthetic resin film, which has low tearability, can be torn due to the force being applied.

In the bag molding method of the present invention, a laminated material is molded by laminating synthetic resin films stretched by a tearing method according to the application. This laminated material is laminated with the heat-sealing layer as the inner surface, and the strip-shaped heat-bonding portion (5) is heat-sealed, leaving both sides (7), the bottom and the opening (2). Next, the bag in the opening (2) is filled with the content, the tearing portion (4) is provided, and the upper portion is heat-sealed to form the easily tearable packaging bag.

The band-shaped heat-bonding portion (5) may be formed by filling the contents and then heat-sealing the upper part at the same time when heat-sealing the upper part. The position of the opening (2) can be changed depending on the position where the band-shaped heat-bonding part (5) is provided, and the position is arbitrary, so that the position of the opening (2) is approximately the center of the bag as shown in FIG. It can also be provided on the right side or on the right side as shown in FIG.

The opening start portion (6) provided on the side edge (7) can be provided after heat sealing the side edge (7) or after filling the content. The tear part (4) is an unheated part between the band-shaped heat-bonded part (5) and the upper heat-bonded part (1), and the width of the tear part (4) is the size of the bag and the thickness of the laminated material. It can be changed according to the size.

In the method of using this bag, first, the bag is torn from the opening start portion (6). When the bag starts to tear, it can be torn in a generally straight line on the opposite side (7), since the laminated material has been stretched in the tear direction. Even if the tear line (3) bends up and down, the tear part (4) is an unbonded part and the tear strength is low and it can be torn, but the upper side heat bonded part (1) and the band-shaped heat bonded part ( Since 5) is a heat-bonded portion, it has a low tearing property and is difficult to tear. The tear line (3) is torn along the upper-side heat-bonded portion (1) and the band-shaped heat-bonded portion (5).

When the bag is torn as described above, a container such as a bottle can be filled with the contents of the bag as shown in FIG.

The tear strength of the heat-bonded portion and the non-heat-bonded portion will be shown by a specific example having the following layer structure. (Example 1) (a) Lamination structure It is a three-layer structure of nylon / tearable polypropylene / low density polyethylene. (B) Thickness of each film Nylon is 15 μm, tearable polypropylene is 25 μm, and low density polyethylene is 130 μm. (Example 2) (a) Lamination structure It is a three-layer structure of tearable nylon / tearable polypropylene / low density polyethylene. (B) Thickness of each film Tearable nylon is 15 μm, tearable polypropylene is 25 μm, and low density polyethylene is 130 μm. (Example 3) (a) Laminated structure A four-layer structure of polyethylene terephthalate / tearable nylon / tearable polypropylene / low density polyethylene. (B) Thickness of Each Film Polyethylene terephthalate is 12 μm, tearable nylon is 15 μm, tearable polypropylene is 25 μm, and low density polyethylene is 130 μm.

<Experimental Example 1> By tearing the above-mentioned laminated material with a tensile strength tester at a heat-bonded portion and an unheated-bonded portion at a descending speed of 500 mm / min, the tear strength of the heat-bonded portion and the non-heat-bonded portion is measured. Indicates.

[0024]

[Table 1]

Therefore, since there is a difference of about 620 (g) or more in the tensile strength between the heat-bonded portion and the non-heat-bonded portion, the heat-bonded portion is less likely to tear than the non-heat-bonded portion. Therefore, if tearing of the bag starts at the heat-bonded part, if the tear line does not tear straight and the tearing part tries to come off from the tear part, the tear part which is the non-heat-bonded part is surrounded by the heat-bonded part. As a result, the tear line advances along the non-heat-bonded portion having high tear strength, so that the bag can be opened at a predetermined place.

Next, the deviation of the tear line between the heat-bonded portion and the non-heat-bonded portion is shown by the laminated material having the following configuration. (Example 4) (a) Lamination structure It is a three-layer structure of nylon / tearable polypropylene / low density polyethylene. (B) Thickness of each film Nylon is 15 μm, tearable polypropylene is 25 μm, and low density polyethylene is 130 μm.

<Example 2> The above laminated material was torn, a straight line was provided from the tearing start portion to the heat-bonded portion and the non-heat-bonded portion, and the deviation when tearing 100 m / m from the center of the tear line was measured. Show.

[0028]

[Table 2]

As a result, the non-heat-bonded part has a narrower displacement range than the heat-bonded part and can be torn substantially linearly. Therefore, if only the non-heat-bonded part is the opening, the opening is planned. Can be formed in any position and size.

The easily tearable package of the present invention starts tearing from an opening start portion (6) such as an I-shaped notch or a V-shaped notch provided on the side edge (7), and is a non-heat-bonded tearing portion. Even if the tear line (3) is torn between the sides (4) to the opposite side (7) and the tear line (3) is bent at the time of tearing, the upper side heat bonding part (1) and the band-shaped heat bonding part (5) , The width of the tear portion (4) does not deviate. The width of the tear portion (4) can be changed depending on the size of the bag, the material of the laminated material, the thickness of the laminated material, the size of the opening, and the like.

[0031]

[Effect of device]

 As described above, in the easily tearable package of the present invention, the heat-bonded laminated material is disturbed in the stretch orientation and the tear strength is increased, so that the non-heat-bonded tear part should be surrounded by the heat-bonded part. As a result, the deviation of the tear line provided in the non-heat-bonded portion is reduced, and even if the tear line is misaligned, the tear line is torn along the heat-bonded portion, so that the bag can be opened linearly.

Since the opening is made narrower than the width of the bag, the opening does not open more than necessary during use, so that the contents can be stably filled in another container. Also, in the process of filling the contents, the size of the opening can be set according to the size of the filling nozzle, etc., so that the contents are blown out, the contents dripping from the filling nozzle, etc. Since it can be prevented, work efficiency is improved.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of the present invention.

FIG. 2 is a use perspective view of the first embodiment.

FIG. 3 is a plan view of a conventional bag.

FIG. 4 is a plan view of a second embodiment of the present invention.

[Explanation of symbols]

 1-Upper heat-bonded part 2-Opening 3-Tearing line 4-Tearing part 5-Band-shaped heat-bonding part 6-Opening start part 7-Side

Claims (1)

[Scope of utility model registration request] 1. A bag made of a tearable laminated material, which is heat-bonded on all sides, and a band-shaped heat-bonded part is provided below the upper-side heat-bonded part to leave an opening, whereby the upper-side heat-bonded part and the band-shaped heat-bonded part are provided. An easily tearable packaging bag, characterized in that a tear portion in an unheated state is provided between the portions.