JPH07206010A - Easily tearable packing bag - Google Patents

Abstract

PURPOSE:To provide a bag made of a laminated material, which increases the working efficiency when the contents are poured and which is excellent in strength, shock-proofing characteristic, etc., and which can be easily opened on using. CONSTITUTION:A packing bag is heat-fused at four sides thereof. And a belt- form heat-adhesion part 3 is provided, leaving an opening 2 under the upper side heat-adhesion part 1 and further, a non-heat-adhesion part 4 is provided between the upper side heat-adhesion part 1 and the belt-form heat-adhesion part 3. In thiseasily tearing packing bag, a tearing tape 5 provided with notches at both sides of the non-heat-adhesion part 4 is stuck on the bag.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is for refilling or
The present invention relates to a bag that can be easily torn and opened to put liquid food such as juice, noodle juice, sauce, soy sauce, etc., which can be used once, or liquid detergent, etc.

[0002]

2. Description of the Related Art Conventionally, flat bags and self-supporting bags made of laminated materials have been used in many fields such as food, medical care and agriculture. Further, in recent years, due to environmental problems, the bag has been used as a bag for refilling contents such as a plastic bottle. This bag was 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, and when the contents are poured into a container or the like, the opening is too wide and is not stable. The contents could not be poured easily. Alternatively, it was possible to stop the tearing opening halfway and narrow the opening, but the part that was torn up partly interfered with the filling of the contents, and the contents could not be filled easily.

On the other hand, if the bag is formed of a laminated material having a high tearing property in order to make the bag easy to tear, even if the bag is easily torn at the time of use, the shock resistance and the strength are low, so that the vibration during transportation is reduced. Sometimes the bag could be torn. In addition, if a bag is molded with a laminated material having high impact resistance and strength, it cannot be easily torn, and tools such as cutters and scissors must be used, resulting in poor work efficiency. Even if it was torn, it couldn't be torn straight.

In order to solve the above problems, a bag in which the width of the heat-bonded portion on the side of the upper side heat-bonded portion is widened by using a laminated material having good tearability, high impact resistance, and high strength is provided. Invented In this bag, the opening formed by tearing the heat-bonded portion during use is smaller than the lateral width of the bag to improve the stability during use of the bag and make it easier to pour the contents in order to solve the above problems. It is a thing.

[0006]

However, even a commonly used laminated material having an easy-opening property and a directional property is slightly misaligned in the direction of stretch due to a slight misalignment in the direction of stretching, so that the front and back sides of the tear line part are misaligned. Could occur and the contents could not be poured easily. Further, when the heat-bonded portion is widened as in the above bag, the laminated material is disturbed in the stretch orientation due to the heat of heat-bonding, and the tear strength of the heat-bonded portion is increased, so that it cannot be easily torn.

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

[0008]

SUMMARY OF THE INVENTION According to the present invention, a strip-shaped heat-bonding portion is provided by leaving the openings below the upper-side heat-bonding portion by heat-bonding on four sides. An easily tearable packaging bag, characterized in that a tear tape having notches is attached from both sides of the non-heat-bonded portion.

In addition, in the packaging bag in which the four sides are heat-bonded and the band-shaped heat-bonded portions are provided so as to sandwich the opening in the upper-side heat-bonded portion so as to surround the unheated-bonded portion from the upper-side heat-bonded portion to the side edges, An easily tearable packaging bag is characterized in that tear tapes having cuts are attached from both sides of an adhesive portion.

[0010]

The easily tearable packaging bag of the present invention is opened substantially linearly by pulling the upper side and the lower side opposite to each other around the notch provided in the tear tape adhered to the band-shaped heat-bonding portion. To be done. That is, the bag is torn along the notch provided on the tear tape. Even if a force to move from the cut is exerted, the tear tape itself has a very large tear strength, so that the tear tape is not torn and the easily tearable packaging bag is torn along the notch.

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. Further, 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.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings.

The synthetic resin film used for the laminated material of the present invention can be selected depending on the contents to be filled in the easily tearable packaging bag. That is, when the filled contents are foods, there is no problem in food hygiene, and a synthetic resin that does not transfer the odor of the synthetic resin film to the contents can be selected and used. When the content is a liquid detergent or the like, a synthetic resin film having a good content suitability can be appropriately selected and used. Further, a synthetic resin film that is strong against an external impact due to the storage, transportation, sales state, etc. of the easily tearable packaging bag can be selected and used.

The tear tape of the present invention uses a biaxially stretched or uniaxially stretched synthetic resin film. The synthetic resin film used is a polyester film such as polyethylene naphthalate, polyethylene terephthalate or polybutylene terephthalate, a polyamide film such as nylon, or a poly carbonate ester film such as polypropylene or polycarbonate. More preferably, a polyester film is used. This is because the tear strength is high, the toughness is high, and the end tear resistance is high. In this example, biaxially oriented polyethylene terephthalate is used. Also, the width of the tear tape is adjusted according to the width of the unheated adhesive portion. The method of adhering the tear tape to the bag is appropriately selected by heat adhesion, an adhesive or the like. Further, as shown in FIG. 5 or 6, the tear tape (5) is provided with a notch (6) at substantially the center thereof.
This makes it possible to tear the easily tearable packaging bag linearly.
The notch (6) may be a tear tape (5) provided up to the adhesive layer (7) as shown in FIG. 5, or a tear tape (5) not provided up to the adhesive layer (7) as shown in FIG. The tear tape is appropriately selected according to the usage condition.

In the easily tearable packaging bag of the present invention, a heat seal layer is first provided on the inner surface, and an easily tearable synthetic resin film or a gas barrier aluminum foil suitable for the use form and contents are appropriately selected. Then, the laminated material is molded. Next, the three sides other than the upper part are heat-bonded, and the laminated material is heat-bonded and molded according to the shape of the band-shaped heat-bonded portion (3),
The contents are filled and the upper heat-bonded portion (1) is molded by heat bonding. Then, the tear tape (5) is attached from both sides of the bag to form the easily tearable packaging bag of this embodiment shown in FIGS. 1 to 3. However, the order of forming the easily tearable packaging bag is not limited to the above order, and can be changed depending on the size of the easily tearable packaging bag, the thickness of the laminated material, and the like.

Further, as shown in FIG.
By providing it from the upper heat-bonded part to the side heat-bonded part, it is possible to prevent the contents from entering the unbonded part between the upper heat-bonded part and the band-shaped heat-bonded part, and to pour into that part when opening. It is possible to prevent the contents to be collected from overflowing.

The position of the opening (2) can be changed depending on the position where the band-shaped heat-bonding portion (3) is provided, and the position is arbitrary, so that the position of the opening (2) is as shown in FIG. It may be provided on the side portion, or may be provided substantially at the center of the bag as shown in FIGS. In addition, the unheated adhesive portion (4),
The width and size of the tear tape (5) can be changed depending on the size of the bag, the thickness of the laminated material, and the like.

As for the method of using this bag, the bag is torn along the notch (6) of the tear tape (5) attached to the unheated adhesive portion (4). At this time, it is advisable to provide a notch connected to the cut (6) in the heat-bonded portion on the side of the end to which the tear tape (5) is bonded. By providing this notch, the opening start portion can be easily confirmed, and tearing for opening the bag is facilitated.

Even if the tearing direction bends up and down from the notch (6) provided in the tearing tape (5), the tearing strength of the tearing tape (5) does not cause tearing, and the tearing always occurs. The easily tearable packaging bag is torn along the line (6).

Then, the easily tearable packaging bag can be torn as described above, and then a container such as a bottle can be filled with the contents of the bag.

The tear strength deviation between the heat-bonded portion and the non-heat-bonded portion is shown in Examples and Comparative Examples having the following layer structures.
Two types of laminate materials were used as the laminate material used for the bag of the present invention. Laminated structure 1 The laminated material has a three-layered structure of stretched nylon / stretched nylon / low density polyethylene from the outside, and the tear tape is a biaxially stretched polyethylene terephthalate film and is attached to the laminate material.
The thickness of each film is 15 μm for each stretched nylon, 130 μm for low density polyethylene, and 25 μm for polyethylene terephthalate film. <Comparative Example 2 and Comparative Example 3> Laminated Structure 2 The laminated structure of the laminated material is a three-layer structure of tearable nylon / tearable polypropylene / low density polyethylene from the outside. The thickness of each film is such that the tearable nylon is 15 μm, the tearable polypropylene is 25 μm, and the low density polyethylene is 130 μm.

Nylon and polyethylene terephthalate, which are synthetic resin films used in this embodiment, are synthetic resins having high strength, impact resistance, cold resistance and the like.
It is a film with high printability, and a film stretched with both nylon and polyethylene terephthalate is used. Tearable nylon is a film that is strongly stretched and oriented in one direction, and is a nylon film that tends to tear in the strong stretching direction. Tearable polypropylene is a polypropylene film which 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.

<Experimental Method> The above-mentioned laminated materials are torn by a tensile strength tester while holding the notch with a chuck and tearing, showing the tear strengths of Examples and Comparative Examples. next,
Deviations in the tear line between the heat-bonded portion and the non-heat-bonded portion are shown by the laminated material having the following configuration.

In the laminated material of the example, a non-heat-bonded portion having a width of 0.8 cm was linearly provided, the width was 0.5 cm so as to cover the non-heat-bonded portion, and a biaxially stretched polyethylene terephthalate was used. A laminated material is used in which the tear tape that has been formed is attached from both sides of the laminated material. At this time, the tear tapes attached to both sides should be cut at opposite positions. The tear tape made of biaxially oriented polyethylene terephthalate film has a thickness of 7 to 50 μm.
The range of m is preferably 12 to 38 μm. This is because the tear tape can be easily attached to the unheated adhesive portion, and the tear tape can always be reliably torn when tearing.

The shapes and conditions of the tear portions of the bags of Examples and Comparative Examples are shown below.

The first embodiment (A) is formed of the laminated material of the laminated constitution 1, and the shape of the bag is such that a tear tape is attached to the bag as shown in FIG.

The second embodiment (B) has a shape in which a tear tape is attached to a bag on the heat-bonded portion as shown in FIG.

In Comparative Example 1 (C), the bag was formed of the laminated material having the laminated constitution 1, and the shape of the bag was such that a tear tape was attached to the heat-bonded portion of the bag as shown in FIG.

In Comparative Example 2 (D), the bag was formed of the laminated material of the laminated constitution 2, and the shape of the bag was such that a tear tape was attached to the heat-bonded portion of the bag as shown in FIG.

In Table 1, measured by the above experimental method,
The tear strength and the deviation from the tear line are shown.

[0031]

[Table 1]

From Table 1, it can be seen that Comparative Example 1 (C) and Comparative Example 2 (D), in which the tear tape is adhered on the heat-bonded portion, have extremely high tear strength, and even if tearing, tear line It cannot be torn off in a straight line. Further, in Example 1 (A) and Example 2 (B), since the tear line is torn along the notch provided in the tear tape, it can be linearly torn and the tear strength is also small. Further, although the unheated adhesive portion can be torn, it cannot be linearly torn.

Further, as can be seen from the comparison in Table 1 above,
When the tear tape is attached on the heat-bonded portion, the tear strength is increased. Therefore, the width of the band-shaped heat-bonded portion where the belt-shaped heat-bonded portion and the tear tape shown in FIG. 3 overlap is 1 cm or less, preferably 1 to 3.
By setting the thickness to mm, the tearability is not affected.

[0034]

As described above, since the easily tearable package of the present invention is torn along the notch provided in the tear tape, the bag can be opened linearly.

Further, since the opening is made narrower than the lateral width of the bag, the opening is not opened more than necessary during use, so that the contents can be stably filled in another container. Further, even in the step of filling the contents, the size of the opening can be provided in accordance with the size of the filling nozzle and the like, so that the blowing of the filling contents, the dripping of the contents from the filling nozzle, etc. are prevented. Therefore, the work efficiency is improved.

[Brief description of drawings]

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

FIG. 2 is a plan view of the present invention.

FIG. 3 is a plan view of the present invention.

FIG. 4 is a plan view of a comparative example.

FIG. 5 is a partial perspective view of the tear tape.

FIG. 6 is a partial perspective view of a tear tape.

[Explanation of symbols]

 1 ... Upper heat-bonded part 2 ... Opening part 3 ... Strip-shaped heat-bonded part 4 ... Non-heat-bonded part 5 ... Tear tape 6 ... Notch 7 ... Adhesive layer

Claims (2)

[Claims] 1. A package in which an unheated adhesive portion is provided between the upper side heat-bonded portion and the band-shaped heat-bonded portion by providing a band-shaped heat-bonded portion which is heat-bonded on four sides and leaves an opening below the upper-side heat-bonded portion. An easily tearable packaging bag, characterized in that a tear tape provided with notches is attached to both sides of the unheated adhesive portion in the bag. 2. A packaging bag, which is heat-bonded on all sides and is provided with band-shaped heat-bonded portions with an opening in the upper-side heat-bonded portion so as to surround the unheated-bonded portion from the upper-side heat-bonded portion to the side edges. An easily tearable packaging bag, characterized in that tear tapes having notches are attached from both sides of the adhesive portion.