JPH0741038A - Packing material which can be torn up and packing bag - Google Patents

Abstract

PURPOSE:To provide a packing material or a packing bag which can the torn up from an arbitrary point to an arbitrary direction without troubles like breaking of film or arising of creases in a process forming scores. CONSTITUTION:The shape of scores 1 is constituted of a straight line 11 parallel to the side edge and at least one slanting part 12 extending to the direction making an obtuse angle against the straight line from at least one end of the straight line 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tearable packaging material and a packaging bag, and more particularly to a packaging material and a packaging bag that can be easily torn from any position by hand.

[0002]

2. Description of the Related Art Conventionally, as a packaging material or a packaging bag to which tearability is imparted to facilitate opening, a portion to be opened (usually a side edge of the packaging material or a sealing portion of the packaging bag).
It is widely known that a V notch or an I notch is provided on the side edge of the. If only one V notch or I notch is provided, the opening position is limited. In order to overcome this limitation, a plurality of I notches, V notches and the like are also known (for example, Japanese Utility Model Laid-Open No. 62-185265).

Further, it is known, for example, from JP-A-62-182067 and JP-A-64-45262 that the opening property is further improved by providing a plurality of rows of minute cuts or the like.

The one disclosed in Japanese Patent Laid-Open No. 62-182067 mentioned above has a plurality of rows of incisions that are orthogonal to the side edges of the packaging material and are provided near the side edges of the packaging material.
On the other hand, in the one disclosed in JP-A-64-45262, the notches formed are cross-shaped or U-shaped,
That is, it is formed by a cut parallel to the side edge of the packaging bag and a cut perpendicular to the cut.
Therefore, it has an excellent point that it can be easily opened regardless of the direction of the packaging material.

[0005]

However, when the packaging materials or packaging bags shown in the above-mentioned JP-A-62-182067 and JP-A-64-45262 are actually manufactured, they are satisfactory depending on the conditions. Sometimes packaging materials and packaging bags could not be obtained.

That is, the cuts are usually formed continuously at the stage of packaging material or after bag making, but since they have the above-mentioned shape, they are orthogonal to the flow direction of the packaging material or the packaging bag. To form a notch.

When the notch which is orthogonal to the flow direction of the packaging material or the like is formed in this way, a slight change in conditions (for example, processing speed, tension) and the type of packaging material (particularly the type of resin of the sealing layer) during the operation. , Thickness) causes cracks from both ends of the notch, propagates, cuts the packaging material, and causes wrinkles.

Therefore, the present invention provides a packaging material or a packaging bag which can be torn in any direction from any position without causing problems such as film breakage and wrinkle formation in the step of forming a notch. is there.

[0009]

That is, the tearable packaging material of the present invention comprises a lengthy film having a thermoplastic resin layer, and is provided for tearing along the inside of at least one side edge of the lengthy film. A packaging material having a large number of cuts formed in one or more rows, wherein the cuts form a straight line portion parallel to the side edge of the long film and at least one end of the straight line portion in a direction forming an obtuse angle with the straight line portion. It is characterized by comprising at least one diagonal portion extending.

Further, the packaging bag of the present invention is a packaging bag produced by making a cut portion of the packaging material as a sealing portion of the bag.

Another packaging bag of the present invention is a packaging bag made of a long film having a thermoplastic resin layer, which is torn along at least one side edge of a sealing portion of the packaging bag. A packaging bag with a large number of cuts formed in one or more rows,
The notch is a linear portion parallel to the side edge of the seal portion,
A tearable packaging bag, comprising: at least one end of the linear portion, and at least one oblique portion extending in a direction forming an obtuse angle with the linear portion.

[0012]

The packaging material or packaging bag of the present invention is provided with a large number of cuts of a specific shape along the side edge of the packaging material or the side edge of the sealing portion of the packaging bag. It is possible to tear perpendicularly to the side edge, and further it is possible to tear parallel to the side edge by the "straight part". And the notch formed in the present invention comprises a straight line portion parallel to the side edge, and an oblique portion extending from the end of the straight line portion in a direction forming an obtuse angle with the straight line portion, and at the side edge. On the other hand, since there are no cuts orthogonal to each other, problems such as unexpected film breakage and wrinkling due to processing or the type of packaging material do not occur.

[0013]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a partial plan view showing an embodiment of the packaging material of the present invention.

The packaging material of the present invention comprises a long film having a thermoplastic resin layer. As the layer constituting the long film, generally, a heat-adhesive resin layer necessary for heat-sealing the packaging material, and formed on the outside thereof,
It is composed of an outer layer made of a thermoplastic resin having a desired function such as heat resistance, strength and gas barrier property. Specific examples are OPP / PE, PET / PE, ONy / PE.
Etc. (OPP is oriented polypropylene, PE is polyethylene, PET is polyethylene terephthalate, ONy
Indicates stretched nylon). P as the heat adhesive resin
It is obvious that other heat-adhesive resins (for example, CPP (unstretched polypropylene), EVA (ethylene-vinyl acetate copolymer), LLDPE (linear low-density polyethylene)) can be used instead of E. If necessary, another plastic film may be provided as the intermediate layer, or a metal foil layer, a paper layer, or the like may be provided.

In the present invention, a large number of tearing notches 1 are formed in one or more rows along the side edges of the long film. The cut 1 includes a straight line portion 11 parallel to the side edge of the long film and at least one oblique portion 12 extending from at least one end of the straight line portion 11 in a direction forming an obtuse angle with the straight line portion 11. It is a thing. More specifically, as shown in FIG. 1, it is possible to exemplify a linear portion 11 and two diagonal portions 12 extending from both ends thereof in a direction forming an obtuse angle with the linear portion 11, respectively. As is clear from the figure, this shape is a shape in which Y-shapes are connected in the vertical direction.

In addition to the shape shown in FIG. 1, the notch 1 of the present invention may have the shape shown in FIG. As is apparent from the figure, the shape shown in FIG. 2A is a substantially Y-shaped cut 1, and the shape shown in FIG. 2B is a substantially V-shaped cut 1.

The notch 1 is formed in one or more rows along the side edge of the packaging material. In practice, it is preferable to provide a plurality of rows. That is, if a plurality of rows of cuts 1 are formed, tearing becomes easier. In addition, in order to improve the processing efficiency, after the slit 1 is provided in the wide packaging material, it is cut into a predetermined width (slitting). However, considering the accuracy of the slitter, it is preferable to provide a plurality of rows for the packaging material after the slitting. It is effective to ensure that the cut 1 exists in the groove. For example, in FIG. 1, two rows and a half of the cuts 1 can be provided along the side edge of the packaging material by slitting at the center of the row of the cuts 1 provided in five rows (shown by the dotted line S).

Further, in the present invention, as shown in FIG. 1, the individual cuts 1 may be arranged in a staggered pattern. This is preferable because the cuts 1 do not overlap each other when the packaging material is wound up and the cuts 1 do not become bulky.

In the present invention, the size of each notch 1 and the interval between the notches 1 (both in the flow direction and the width direction) are not particularly limited, and are appropriately selected according to the size of the contents to be stored. do it. When the cuts 1 are alternately arranged in a zigzag pattern as described above, the cuts 1 in each row may be alternately arranged and partially overlap each other. In some cases, the rows may be spaced at such intervals. In some cases it may be preferred.

In the embodiment of FIG. 1, the slitting is such that there is a notch 1 on the side edge of the packaging material. But,
This is not essential to the invention. That is, if the notch 1 exists slightly inside the side edge of the packaging material, when a force for tearing is applied, the crack propagates from the notch 1 and tearing is possible. For example, as shown in FIGS. 2 (a) and 2 (b), if the slitter position S is set between rows, it is possible to obtain a packaging material having no notch 1 on the side edge.

The above-mentioned notch 1 may or may not penetrate in the thickness direction of the packaging material. From the viewpoint of easy tearing of the packaging material, it is preferable that the notch 1 penetrates the packaging material. On the other hand, from the viewpoint of processing the packaging material, it may be preferable not to penetrate the packaging material.

Therefore, the packaging material which is completed as the layer structure and which is provided with the notch 1 which does not penetrate is also
The packaging material of the present invention includes the packaging material of the present invention in which the notch 1 is provided in advance in a part of the layers of the packaging material and another layer is laminated.

The notch 1 can be formed by a known method. For example, it can be formed by a method of pressing a flat plate or a roll provided with a blade of a predetermined shape against the packaging material.

Next, the packaging bag of the present invention will be described.
One of the packaging bags of the present invention is produced by making the above-mentioned tearable packaging material with the portion where the notch 1 is formed as the sealing portion 2 of the bag. Further, another packaging bag of the present invention is one in which the notch 1 having the above-described specific shape is provided along the side edge of the seal portion 2 of the packaging bag formed in a known form by a known method. .

FIG. 3 is a plan view showing an embodiment of the packaging bag of the present invention. As shown in the figure, the packaging bag of the present invention is one in which a plurality of notches 1 having a specific shape are formed in one or more rows along the side edge of the seal portion 2 of the bag.

The packaging bag of the present invention can be obtained by bag-making the packaging material of the present invention shown in FIGS. At this time, naturally, it is necessary to make the bag in which the notch 1 is formed as the seal portion 2 of the bag. If a more specific example is shown, the packaging material of the present invention obtained by providing the cut 1 having the specific shape along both side edges of the long film is folded in two in the width direction, and the side edges are lengthwise ( A heat seal 21 in the flow direction), a transverse seal 22 that crosses the width direction of the film are formed, and further cut into a predetermined length to obtain a three-way seal having an opening as shown in FIG. You can get the packaging bag. In this packaging bag, since the notch 1 is present in the vertical seal portion 21, it can be torn from the vertical seal portion 21.

In addition to the shape of the above three-sided seal bag, the packaging bag of the present invention has various known shapes such as a four-sided seal bag, a pillow packaging bag, a gusset bag, a standing pouch (self-supporting bag), an envelope sticking bag and the like. Can be in the shape of.

In the packaging bag of the present invention shown in FIG. 3, the cut 1 is formed only in the vertical seal portion 21, but only in the horizontal seal portion 22 or in the vertical seal portion 21 and the vertical seal portion 21 as shown in FIG. 4, for example. Even if the notch 1 is formed in both of the lateral seal portions 22, there is no problem in one direction, and the formation position can be determined according to the purpose. In addition, in order to set the formation position as shown in FIG. 4, it is sufficient to provide the notch 1 along the side edge of the long film and to form a group of the notch 1 so as to cross the width direction of the film, If this is cut at a predetermined position, the notch 1 can be present at the position shown in FIG. By providing the cut 1 in both the vertical seal portion 21 and the horizontal seal portion 22 in this manner, the bag can be torn from any position of the bag in any direction.

In the packaging bag of the present invention manufactured by the above method, since the sealing portion 2 is formed by heat sealing, even if the notch 1 penetrating the packaging material is formed, In the heat seal part 2,
Notch 1 does not penetrate (closed by heat sealing).

The packaging material of the present invention can be manufactured by a method different from the above-mentioned embodiment. That is, the notch 1 may be formed later along the side edge of the seal portion 2 of the packaging bag manufactured according to the conventional method. According to such a method, the notch 1 provided in the seal part 2 can be penetrated.

Example 1 A polyethylene terephthalate film having a thickness of 12 μm was laminated with a polyethylene film having a thickness of 50 μm by an extrusion laminating method.
A laminated film having a width of 150 mm was obtained. Along the both side edges of this laminated film, cuts (flow direction dimension: 0.4 mm, width direction dimension: 0.3 mm) having the shape shown in FIG. Distance:
0.5 mm) and slitted at the slit positions shown in the drawing to prepare a packaging material of the present invention having three rows of cuts along both side edges. The outermost row extends over the side edge and has a partial shape.

The cuts were made by passing the laminated film between a roll provided with a blade having the above-mentioned shape and a receiving roll arranged opposite to each other. When the above-mentioned notches were formed, problems such as inadvertent film breakage and wrinkles did not occur.

Example 2 A polyethylene terephthalate film having a thickness of 16 μm was laminated with a polyethylene film having a thickness of 50 μm by an extrusion laminating method.
A laminated film having a width of 450 mm was obtained. Incisions similar to those in Example 1 were formed along both side edges of this laminated film and portions to be slitter (namely, two portions to be side edges of the packaging material after slitting).

The formation of the above-mentioned cuts did not cause problems such as careless film breakage and wrinkles. By slitting the obtained packaging material at a predetermined position, a packaging material of the present invention (width about 150 mm) having cuts along both side edges was obtained.

<Example 3> Using the packaging material of the present invention obtained in Example 2, a sealed bag of the present invention was prepared. That is,
Two sheets of the packaging material (long film) of the present invention having notches along both side edges are prepared, both polyethylenes are overlapped face to face, and the side edges are heat-sealed to form vertical seal portions (two places). Along with the formation, a transverse seal portion that crosses the width direction is formed by heat sealing, and then the immediate vicinity of the transverse seal portion is cut to open one side.
I got a seal bag. This packaging bag had a notch formed in the vertical seal portion, and could be torn from the portion.

<Example 4> Two packaging materials (long films) having the same layer structure as those of Example 2 (however, notches are not formed) are prepared, and the polyethylenes of both are overlapped face to face to form side edges. And heat-seal each to form a vertical seal portion (two places), and along the vertical seal portion,
A notch having the same shape as in Example 1 was formed in the same manner as in Example 1. At this time, neither breakage of the film nor generation of wrinkles was observed. Next, a horizontal seal portion that crosses the width direction was formed by heat sealing, and further, the immediate vicinity of the horizontal seal portion was cut to obtain a four-sided seal bag with one side open. This packaging bag had a notch formed in the vertical seal portion, and could be torn from the portion.

[0037]

As described above, the packaging material or the packaging bag of the present invention is formed with a cut having a specific shape, so that it can be torn from a desired position. In addition, there is no problem of inadvertent film breakage or wrinkling when forming the cut.

[Brief description of drawings]

FIG. 1 is a partial plan view showing an embodiment of a packaging material of the present invention.

FIG. 2 is an explanatory view showing another example of the shape of the cut formed in the present invention.

FIG. 3 is a plan view showing an embodiment of the packaging bag of the present invention.

FIG. 4 is a plan view showing another embodiment of the packaging bag of the present invention.

[Explanation of symbols]

 1 ... Notch 2 ... Seal part 11 ... Straight part 12 ... Diagonal part

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takayuki Yamamoto 1-5-1 Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd.

Claims (3)

[Claims] 1. A packaging material comprising a long film having a thermoplastic resin layer, wherein a plurality of tear notches are formed along the inner side of at least one side edge of the long film in one or more rows. The notch is composed of a straight line portion parallel to the side edge of the long film, and at least one oblique portion extending from at least one end of the straight line portion in a direction forming an obtuse angle with the straight line portion. And
Tearable packaging material. 2. A tearable packaging bag obtained by making the packaging material according to claim 1 into a bag having a notched portion as a sealing portion of the bag. 3. A packaging in which at least a part of a seal portion of a packaging bag made of a long film having a thermoplastic resin layer is provided with a plurality of tear notches along the side edge in one or more rows. The bag, wherein the notch comprises a linear portion parallel to the side edge of the seal portion and at least one oblique portion extending from at least one end of the linear portion in a direction forming an obtuse angle with the linear portion. A tearable packaging bag, characterized in that