JP4550075B2 - Bag - Google Patents

Description

        The present invention relates to a bag body for packaging toiletries, processed foods, etc. that is easy to open and resistant to impact.

Toiletries and processed foods such as liquid detergents, shampoos, rinses, body shampoos, and the like are often distributed after being filled into a bag (also called a pouch) made of a single-layer or multilayer resin film.
Such a bag may have a notch formed in the spout so that it can be easily opened by hand without using a tool such as scissors when opening the bag. Moreover, when opening from the notch as a starting point, a concave opening assisting line for inducing opening may be formed so that the opening is easier.

  However, if such a bag filled with contents is accidentally dropped and a spout formed with a notch and an opening assist line hits the floor, the impact will follow the opening assist line starting from the notch. In some cases, cracks occurred in the direction, etc., and the contents filled in the bag leaked out.

    The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a bag body that can be easily opened by hand at the time of opening, does not cause cracks when dropped, and does not leak contents.

The bag body of the present invention is a bag body in which a notch serving as a starting point of opening and a concave opening assisting line that guides the opening are formed, and the opening assisting line is formed discontinuously with the notch. The pouring spouts are provided so that their positions do not deviate from each other, and at least the direction of the vicinity of the tip on the notch side is different from the direction of the force applied to the notch, and the notch It is formed only on the upper end side of the sealing portion of the spout.
The bag of the present invention is a bag formed with a notch serving as a starting point for opening and a concave opening assisting line for guiding the opening, and the opening assisting line is discontinuous with the notch. Formed and provided on only one side of the spout and at least the direction of the vicinity of the tip on the notch side is different from the direction of the force applied to the notch, and the notch is a seal for the spout. It is characterized by being formed only on the upper end side of the part.
Further, in the bag body, it is preferable that the tip of the opening assist line on the notch side and the tip of the notch on the opening assist line side have an interval of 0.3 to 0.8 mm. .

        According to the bag body of the present invention, even when the bag body filled with the contents can be easily opened by hand and force is applied to the notch, the opening assist line from the notch is caused by the impact. No cracks are produced. Therefore, it is possible to obtain a bag body that is easy to open and that does not crack and does not leak contents upon impact such as dropping.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a plan view of a bag body 10 which is an embodiment of the present invention, and a peripheral portion (hereinafter referred to as a seal portion) 11 excluding an upper end portion 16 of two resin sheets in the drawing is thermally welded. It is formed in a bag shape. The upper end portion 16 of the bag body 10 is open, and after the contents are filled from here, it can be sealed by heat welding. In addition, a spout 12 for pouring contents from the bag body 10 to another container is formed at one corner of the bag body 10. FIG. 2 is a cross-sectional view taken along the line AA ′ in FIG. 1, and between the seal portions 11 is an unsealed portion 13 that is not thermally welded.

    The outer layer of the resin sheet used in this example is, for example, a biaxially stretched polyethylene terephthalate (PET) layer having a thickness of 12 to 25 μm or a biaxially stretched polyamide resin layer having a thickness of 15 to 25 μm. The inner layer is a laminated sheet made of, for example, a linear low density polyethylene (LLDPE) layer having a thickness of 100 to 150 μm, and includes a wet lamination method, a dry lamination method, a solventless dry lamination method, an extrusion lamination method, It is manufactured by the extrusion lamination method.

    As shown in FIG. 3, the spout 12 has a notch 14, which is a linear notch serving as a starting point for opening, only on the upper end 16 side of the seal portion 11. Further, when opening from the notch 14 as a starting point, a concave opening assisting line 15 for guiding the opening so that it can be easily opened by hand is formed at the end of the spout 12 opposite to the notch 14. Has been. The opening assisting line 15 in this example is formed not only on one side of the spout 12 but also on both sides.

  In the bag body 10 of this example, the opening assisting line 15 has a gap of 0.3 to 0.8 mm between the tip 15c on the notch 14 side and the tip of the notch 14 on the opening assisting line 15 side. Thus, the notch 14 is a concave shape formed discontinuously. Further, in the opening assist line 15 of this example, the tip vicinity portion 15a on the notch 15 side is formed in a semicircular curve, and the direction of the force applied to the notch 14 (that is, the direction along the length of the notch 14) Are formed differently. On the other hand, the portion 15 b other than the portion near the tip is formed in the direction of the force applied to the notch 14.

  The width of the spout 12 indicated by W in FIG. 3 is about 33 mm, and the length L of the notch 14 is 1 to 2 mm. Further, the tip vicinity portion 15a of the opening assisting line 15 has a semicircular shape with a diameter of about 3 to 4 mm.

When the spout 12 formed with the notches 14 and the opening assisting lines 15 is torn and opened by hand, the force concentrates on the notches 14 so that the opening can be started easily.
Further, the opening assisting line 15 is formed so that the tip on the notch 14 side is 15c and the tip of the notch 14 has a distance of 0.3 to 0.8 mm. In particular, the opening is not hindered, and the opening can be easily and stably performed along the opening assisting line 15. On the other hand, when the opening assisting line 15 is formed with a gap of 0.3 to 0.8 mm between the opening 14 and the notch 14, the bag body 10 of this example filled with the contents falls. Even if the spout 12 hits the floor or the like and a force is applied to the notch 14, the crack does not occur.
Furthermore, even if a crack is generated in the portion between the notch 15 and the opening assisting line 14, the tip vicinity portion 15 a on the notch 14 side of the opening assisting line 15 has a force applied to the notch 14. Since it is formed so as to be different from the direction, the force due to the impact is further transmitted to the opening assisting line 15 and a crack along this is not generated.

    In addition, as long as the opening assisting line 15 is formed so that the direction of the tip vicinity part 15a on the notch 14 side is different from the direction of the force applied to the notch 14, the other part 15b is as shown in FIG. 4, even if it is formed in the same direction as the direction of the force applied to the notch 14, as shown in FIG. 4, the tip vicinity portion 15 a and the other portion 15 b are not particularly distinguished from each other. They may be formed in different directions. Even if it is a form like FIG. 4, when force is applied by hand, it can be opened easily along the opening assisting line 15, and cracks do not occur due to external force such as impact.

Further, as the resin sheet constituting the bag body 10, a laminated sheet whose outer layer is made of a polyamide resin layer having a thickness of 15 to 15 μm and whose inner layer is made of a linear low density polyethylene (LLDPE) layer having a thickness of 100 to 150 μm. Is used, the opening aid line 15 has a notch 14 side tip 15c having a gap of 0.3 to 0.8 mm between the notch 14 and the opening aid line 15 side tip. However, the interval can be set as appropriate according to the type of the resin sheet.
The shape of the notch 14 may be a linear cut, a U-shape, a V-shape notch, or the like as long as it becomes the starting point of opening, and the shape is not limited. Further, the tip vicinity portion 15a on the notch 14 side of the opening assisting line 15 may have any shape and size such as a substantially semicircular shape, a V shape, and a U shape other than a semicircular shape as shown in the illustrated example. Good. Further, even in the case of a semicircular shape, the size can be set as appropriate.

    Furthermore, while the tip of the opening assisting line 15 on the notch 14 side and the tip of the notch 14 on the opening assisting line 15 side can be easily opened by hand, an interval that does not cause a crack due to an impact such as dropping. 5, for example, as shown in FIG. 5, the entire opening assisting line 15 may be formed in the same direction as the direction of the force applied to the notch 14.

The notch 14 and the opening assist line 15 can be formed by the following method, for example.
First, a notch 14 is formed by irradiating a laser beam such as a carbon dioxide laser to a predetermined portion of the seal portion 11 by scanning it from both surfaces a plurality of times. Here, since the spout 12 is made of a PET layer or the like whose outer layer easily absorbs the laser, the portion of the outer layer irradiated with the laser generates heat, melts, and further evaporates. Then, it is considered that the notch 14 is formed by melting and evaporating the inner layer made of the LLDPE layer which hardly absorbs the laser due to the heat generated at this time.

    Next, after forming the notch 14, the laser is further scanned and irradiated to form a concave opening assisting line 15 continuous with the notch 14. At this time, the opening assist line 15 needs to be formed with a sufficient strength and a depth that can be easily torn off by hand. Avoid trapping or making it impossible to tear by hand due to insufficient depth. Usually, the opening assist line 15 is formed by irradiating a laser to such an extent that the outer layer evaporates and the inner layer is exposed.

Here, the laser is not particularly limited as long as it can form the notch 14 and the opening assisting line 15. A gas laser other than a carbon dioxide laser, a solid-state laser such as a YAG laser, a semiconductor laser, or the like is used as the material of the resin sheet. It can be used as appropriate.
The output of the laser used is preferably in the range of 3 to 100W. If the output is less than 3 W, it may take a long time to form the notch 14, and if it exceeds 100 W, the laser device tends to be expensive. Further, in order to form the notch 14 and the opening assisting line 15, the number of times the laser is scanned with respect to the portion can be set as appropriate. For example, the laser output is in the above range, When forming the opening assist line 15, the laser is scanned 3 to 10 times in a reciprocating manner to form the notch 14, and the laser is scanned 1 to 2 times in a reciprocating manner to form the opening assist line 15.

    In this example, since the opening assist line 15 is formed on both sides of the spout 12, the laser is irradiated from both sides of the spout 12. In this case, a mirror or a prism is used at the time of laser irradiation. It is preferable to divide one laser light source and to provide a position sensor such as a CCD camera or a phototube so that the positions of the opening assist lines 15 are not shifted from each other. The opening assisting line 15 is preferably formed on both sides of the spout 12 as in this example, but depending on the material and thickness of the resin sheet forming the spout, it may be formed only on one side. Good.

    As described above, when the laminated sheet made of the LLDPE layer or the like whose inner layer is difficult to absorb laser and the outer layer is easily formed of PET or the like as the outer layer is used as the bag body 10, the notch 14 and the unsealing by the laser irradiation described above are used. The auxiliary line 15 can be manufactured continuously, easily and accurately. Moreover, if the part in which the notch 14 and the opening assistance line 15 are formed at least in the bag body 10 consists of such a laminated sheet, these can be formed by the above-mentioned laser irradiation. However, the material of the bag body 10 is not particularly limited to these, and can be appropriately selected according to the properties of the contents to be filled. For example, the bag 10 may be formed only from a material that hardly absorbs the laser. In that case, the opening assisting line 15 can be formed by mechanically forming the notch 14 using a blade mold and further forming a concave shape by mechanically scratching the surface with a cutter or the like.

    The “resin layer that hardly absorbs laser” means that the surface of the sheet is not damaged or the resin is not evaporated when a carbon dioxide laser with a frequency of 4 to 6 kHz is irradiated at a scanning speed of 600 to 1000 mm / sec. Such a resin layer is said. On the other hand, “resin layer that easily absorbs laser” means that when a carbon dioxide laser with a frequency of 4 to 4.5 kHz is irradiated at a scanning speed of 700 to 800 mm / sec, the sheet surface is scratched or the resin evaporates. A resin layer.

    The “resin layer that hardly absorbs laser” includes polypropylene, low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-vinyl acetate copolymer, ethylene-methacrylic acid copolymer, ethylene methyl acrylate copolymer. Examples thereof include polyolefin resins such as coalescence and ethylene ethyl acrylate copolymer. On the other hand, examples of the “resin layer that easily absorbs laser” include polyamide resins such as 6-nylon, 6,6-nylon, 12-nylon, and MXD-6 nylon, polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. A polyester resin etc. can be illustrated. Each of these layers may be a single layer or a multilayer. Furthermore, these layers include a gas barrier resin layer such as an ethylene / vinyl alcohol copolymer, an acrylic resin, or vinylidene chloride, a metal oxide vapor deposition layer, depending on the contents filled in the bag 10. A layer capable of imparting various functions such as a printed layer may be included.

It is a top view which shows one Embodiment of the bag body of this invention. It is sectional drawing which follows the A-A 'line of FIG. It is an enlarged plan view which shows the principal part of the bag body of FIG. It is an enlarged plan view which shows the principal part of the bag body of other embodiment of this invention. It is an enlarged plan view which shows the principal part of the bag body of other embodiment of this invention.

Explanation of symbols

        DESCRIPTION OF SYMBOLS 10 ... Bag body, 14 ... Notch, 15 ... Opening auxiliary line, 15a ... The vicinity of the notch side tip of the opening auxiliary line, 15c ... Notch side tip of the opening auxiliary line

Claims (3)

A bag body formed with a notch serving as a starting point for opening and a concave opening auxiliary line for guiding the opening,
The opening assisting line is formed discontinuously with the notch and is provided so that the positions of both sides of the spout are not shifted from each other, and at least the direction of the vicinity of the tip on the notch side is the force applied to the notch. The bag is characterized by being formed differently from the direction, and the notch is formed only on the upper end side of the sealing portion of the spout. A bag body formed with a notch serving as a starting point for opening and a concave opening auxiliary line for guiding the opening,
The opening assisting line is formed discontinuously with the notch, is provided only on one side of the spout, and is formed such that the direction of at least the vicinity of the tip on the notch side is different from the direction of the force applied to the notch. And the notch is formed only on the upper end side of the sealing portion of the spout.   The tip on the notch side of the opening assisting line and the tip on the opening assisting line side of the notch have an interval of 0.3 to 0.8 mm. Bag body.

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