Standing pouch

Abstract

To provide a standing pouch that uses paper as a part of its material, and that can sufficiently suppress fusion between surfaces of the packaging material forming its bottom.SOLUTION: A standing pouch according to the present disclosure is formed by heat-sealing: a first side body part including a first printing layer, a first base material, and a first heat seal layer; a second side body part including a second printing layer, a second base material, and a second heat seal layer; and a bottom tape including a third printing layer, a third base material, and a third heat seal layer in this order and having a mountain-folding part, wherein the first, second, and third base materials are paper, wherein a region of the third printing layer to be heat-sealed and forming the bottom of the standing pouch has a mass per unit area of 3.5 g / m2 or less, and wherein the first, second, and third heat seal layers are formed of a varnish having heat-sealable properties.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a standing pouch.

Background Art

[0002] As an example of a packaging bag, a standing pouch can be mentioned. A standing pouch can make the product stand out on the store shelf and its scope of adoption is expanding. In order to make the entire surface visible without the standing pouch bending in the middle, a certain degree of rigidity is required for the packaging material constituting the pouch.

[0003] Conventionally, various types of standing pouches have been developed. For example, Patent Document 1 discloses a standing pouch suitable for enclosing a solid product having a size smaller than the internal space of the standing pouch. Patent Document 2 discloses a stand-type packaging bag having appropriate oil and water resistance, excellent heat sealability and air permeability, and particularly suitable for packaging cooked foods such as fast food, fried foods, and grilled foods.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In recent years, as seen in the problem of marine plastic waste, it has been regarded as a problem that microplastics affect environmental pollution. Along with this, the trend of the plastic reduction movement and refraining from using plastic products has increased, and the demand for packaging materials made of paper alone or composite materials containing paper has increased.

[0006] The inventors of the present invention prototyped a standing pouch using a packaging material including paper, a printing layer provided on one surface of the paper, and a heat-sealing layer provided on the other surface of the paper. As a result, at the bottom of the standing pouch, an event occurred in which the surfaces of the packaging material fused together. When the bottom of the standing pouch fused, the efficiency of the operation of expanding the bottom to accommodate the contents decreased, or the printing layer peeled off during the operation of expanding the bottom, resulting in a poor appearance. This is an event caused by using paper instead of a transparent resin film. That is, if the base material is a transparent resin film, a printing layer can be formed on the back surface side, whereas when using opaque paper as the base material, the printing layer has to be formed on the surface side, and the above-described event can occur.

[0007] The present disclosure provides a standing pouch using paper for a part of the material, which can sufficiently suppress the fusion of the surfaces of the packaging material constituting the bottom thereof.

Means for Solving the Problems

[0008] One aspect of the present disclosure relates to a standing pouch. This standing pouch is formed by heat-sealing a first side body portion including a first printing layer, a first base material, and a first heat-sealing layer, a second side body portion including a second printing layer, a second base material, and a second heat-sealing layer, and a bottom tape including a third printing layer, a third base material, and a third heat-sealing layer in this order and having a mountain fold portion. The third base material is paper, and among the third printing layer, the area where heat-sealing is applied to form the bottom of the standing pouch has a mass per unit area of 3.5 g / m 2 is as follows.

[0009] The inventors of the present invention focused on the mass per unit area (dry coating amount) of the printing layer and repeated prototyping while varying this value. As a result, among the printing layers of the bottom tape (third printing layer), at least the mass per unit area of the above-described area is 3.5 g / m 2The inventors have found that by the following, it is possible to sufficiently suppress the fusion of the surfaces of the printing layers at the bottom of the standing pouch.

[0010] It is preferable that the above region in the printing layer (third printing layer) of the bottom tape does not fuse even when heated at a temperature slightly higher than the temperature at the time of actually manufacturing the standing pouch (for example, 150 °C). That is, in a state where the regions in the third printing layer face each other, after heat pressing under the conditions of a temperature of 150 °C, a pressure of 0.2 MPa, and a time of 1 second, the peel strength between the regions is preferably less than 1.0 N / 15 mm.

[0011] From the viewpoint of global environmental conservation, in addition to the third base material being paper, both the first and second base materials may also be paper. It is preferable that the first and second printing layers each include an ink layer and a varnish layer (overprint varnish) formed so as to cover the ink layer. By providing the varnish layer, the ink layer can be protected and the surface of the side body portion can be given gloss. On the other hand, since the bottom tape constitutes the bottom of the standing pouch, it is not always necessary to provide a display such as a pattern or characters. For this reason, the third printing layer may include at least a varnish layer, and the ink layer may be formed as necessary.

Advantages of the Invention

[0012] According to the present disclosure, there is provided a standing pouch using paper for a part of the material, which can sufficiently suppress the fusion of the surfaces of the packaging materials constituting the bottom thereof.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present disclosure will be described in detail. Here, a standing pouch that does not require a high degree of airtightness will be described. The standing pouch according to the present embodiment is used, for example, as a secondary packaging material for accommodating articles (such as cosmetics and sunscreen creams) accommodated in a primary container. Note that the present invention is not limited to the following embodiments.

[0015] <Standing Pouch> FIG. 1 is a front view schematically showing a standing pouch according to the present embodiment. FIG. 2 is a cross-sectional view schematically showing the configuration of the standing pouch according to the present embodiment. The standing pouch 50 shown in these figures is formed by heat-sealing a pair of side body portions 10 and 20 (first and second side body portions) and a bottom tape 30. Each of the pair of side body portions 10 and 20 and the bottom tape 30 is composed of a laminate including a base material 1, a printing layer 2, and a heat-sealing layer 3 (see FIG. 2). The printing layer 2 is formed on the surface 1a side of the base material 1 (the outer surface side of the standing pouch 50). The heat-sealing layer 3 is formed on the back surface 1b side of the base material 1 (the inner surface side of the standing pouch 50). The standing pouch can be formed by heat-sealing in the same manner as the conventional method.

[0016] The bottom tape 30 has one mountain fold 30a. That is, in the state where the standing pouch 50 stands independently, the bottom tape 30 is arranged in an inverted V shape (see FIGS. 2 and 3). The bottom of the standing pouch 50 is composed of a bottom seal portion 5 and a bottom seal portion 6 as shown in FIG. 2. The bottom seal portion 5 is a portion where the bottom 10a of the side body portion 10 and one bottom 30b of the bottom tape 30 are heat-sealed. The bottom seal portion 6 is a portion where the bottom 20a of the side body portion 20 and the other bottom 30c of the bottom tape 30 are heat-sealed.

[0017] The side portion of the standing pouch 50 is composed of a side seal portion 7. The width of the side seal portion 7 is, for example, 5 to 18 mm, and may be 7 to 15 mm. When the width of the side seal portion 7 is 5 mm or more, it tends to achieve sufficient seal strength. On the other hand, when it is 18 mm or less, it tends to easily ensure a sufficient content volume of the standing pouch 50.

[0018] As shown in FIG. 1, the standing pouch 50 has fusion portions 9 on both sides of the bottom. The fusion portions 9 join the side body portion 10 and the side body portion 20. The fusion portions 9 are locations where the heat-sealing layers 3 of the side body portions 10 and 20 are locally fused through the cutout portions 8 provided in the bottom tape 30. As shown in FIG. 3, the cutout portions 8 of the bottom tape 30 are regions between the mountain fold 30a and the bottom sides 30d, 30d and are provided on the side portions of the bottom tape 30.

[0019] <Packaging material> The standing pouch 50 is composed of a packaging material including paper. The base material 1 included in the pair of side body portions 10, 20 and the bottom tape 30 is paper. FIG. 4 is a cross-sectional view schematically showing the laminate according to the present embodiment. The packaging material 40 shown in this figure includes a base material 1, a printing layer 2, and a heat-sealing layer 3. The packaging material 40 can be obtained, for example, by using a printing machine to form the printing layer 2 and the heat-sealing layer 3 on the base material 1.

[0020] The base material 1 is paper as described above. Specific examples of paper that can be used as the base material 1 include fine paper, special fine paper, coated paper, art paper, cast coated paper, imitation paper, and kraft paper. The mass per unit area of the base material 1 is, for example, in the range of 20 to 500 g / m 2 or 25 to 400 g / m 2 is sufficient.

[0021] The printing layer 2 in the present embodiment is composed of an ink layer 2a and a varnish layer 2b. The ink layer 2a is directly formed on the surface 1a of the base material 1. The varnish layer 2b is formed on the surface 1a so as to cover the ink layer 2a. In the present embodiment, the varnish layer 2b constitutes the outermost surface of the packaging material 40. Both the ink layer 2a and the varnish layer 2b contain nitrocellulose and a synthetic resin, and the ink layer 2a further contains a pigment. From the perspective of environmental consideration, it is preferable to form the ink layer 2a using chlorine-free ink or vegetable oil ink.

[0022] The mass per unit area of the printing layer 2 (the total dry coating amount of the ink layer 2a and the varnish layer 2b) is 3.5 g / m 2 or less. Thereby, the fusion of the surfaces of the bottom tape 30 of the standing pouch 50 can be sufficiently suppressed. This amount may be 3.2 g / m 2 or less, 2.8 g / m 2 or less, or 1.5 g / m 2 or less. The lower limit value of this amount is 0.5 g / m 2 When this value is 0.5 g / m 2 there is a tendency to form a clear printing layer 2.

[0023] The heat seal layer 3 is formed by applying a varnish having heat sealability (heat seal varnish). The mass per unit area of the heat seal layer 3 (the dry coating amount of the heat seal varnish) is, for example, 1 to 7 g / m 2It is so. The heat-sealing layer 3 contains a heat-melting component, for example, a metal salt of ethylene-methacrylic acid copolymer or solid paraffin. As the material constituting the heat-sealing layer 3, a polyethylene resin (for example, linear low-density polyethylene (LLDPE)) or a polypropylene resin (for example, unstretched polypropylene (CPP)) may be used.

[0024] As described above, the embodiments of the present disclosure have been described in detail. However, the present invention is not limited to the above embodiments. For example, in the above embodiments, the side body portions 10 and 20 and the bottom tape 30 all have the same configuration, and the case where each has the printing layer 2 with a mass per unit area within a predetermined range has been illustrated. However, in order to solve the problem of suppressing the fusion of the surfaces of the bottom tape 30 of the standing pouch 50, it is sufficient that only the bottom tape 30 has the printing layer 2 satisfying a predetermined condition. Further, among the printing layers of the bottom tape 30, it is sufficient that the printing layer 2 satisfying a predetermined condition is formed in the region where heat is applied when forming the bottom seal portions 5 and 6.

Example

[0025] Hereinafter, the present disclosure will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.

[0026] A packaging material was produced using the following materials. (1) Base material ·N Shairyuuou (trade name, manufactured by Daio Paper Corporation, 60 g / m 2 ) (2) Printing layer (ink and overprint varnish) ·Eco Color HR (manufactured by Toyo Ink Co., Ltd.) (3) Heat-sealing layer ·Heat-sealing varnish (HS varnish): Seikadain F-2000W (manufactured by Dainichi Seika Chemicals Co., Ltd.) ·Linear low-density polyethylene (LLDPE) ·Unstretched polypropylene (CPP)

[0027] [Examples 1 to 4 and Comparative Example 1] The mass per unit area of the printing layer (the total dry coating amount of the ink and the overprint varnish) was set to the amounts shown in Table 1, and packaging materials according to Examples and Comparative Examples were produced. Using these packaging materials, standing pouches having the same configuration as that of FIG. 1 were produced. The heat seal bar temperature when forming the bottom seal portion was 130°C.

[0028] <Presence or absence of fusion between the surfaces of the bottom tape> When the bottom tapes of the standing pouches according to Examples 1 to 4 were spread out, no fusion was observed between the printing layers of the bottom tapes, and no peeling of the printing layer occurred. On the other hand, when the bottom tape of the standing pouch according to Comparative Example 1 was spread out, fusion was observed between the printing layers of the bottom tape, and peeling of the printing layer occurred.

[0029] <Peeling strength of the printing layer of the bottom tape> With the surfaces of the printing layers of the bottom tape facing each other, after heat pressing (pressure: 0.2 MPa, time: 1 second) under the temperature conditions shown in Table 1, the peeling strength between the surfaces of the printing layers of the bottom tape was measured. The peeling strength was measured using a tensilon universal material testing machine (manufactured by A&D Company, Limited), with a sample width of 15 mm and a test speed of 300 mm / min. The results are shown in Table 1.

[0030]

Table 1

Explanation of reference numerals

[0031] 1…Base materials (first, second, and third base materials), 1a…Surface, 1b…Back surface, 2…Printing layers (first, second, and third printing layers), 2a…Ink layer, 2b…Varnish layer, 3…Heat seal layers (first, second, and third heat seal layers), 5, 6…Bottom seal parts, 7…Side seal part, 8…Notch part, 9…Fusion part, 10, 20…Side barrel parts (first and second side barrel parts), 10a, 20a…Bottom parts, 30…Bottom tape, 30a…Valley fold part, 30b, 30c…Bottom parts, 30d…Bottom edge, 40…Packaging material, 50…Standing pouch.

Claims

1. a first side body portion including a first printed layer, a first substrate, and a first heat seal layer; a second side body portion including a second printed layer, a second substrate, and a second heat seal layer; a bottom tape including, in this order, a third printed layer, a third substrate, and a third heat seal layer, the bottom tape having a mountain fold; A standing pouch formed by heat sealing the the first substrate, the second substrate, and the third substrate are paper; The third printed layer has a mass per unit area of ​​3.5 g / m in the area where the heat seal is applied and which constitutes the bottom of the standing pouch. ２ is as follows: The standing pouch, wherein the first heat seal layer, the second heat seal layer and the third heat seal layer are formed of a varnish having heat sealability.

2. The standing pouch according to claim 1, wherein after the regions of the third printed layer are placed facing each other and heat pressed under conditions of a temperature of 150°C, a pressure of 0.2 MPa, and a time of 1 second, the peel strength between the regions is less than 1.0 N / 15 mm.

3. The standing pouch according to claim 1 or 2, wherein the first and second printed layers each include an ink layer and a varnish layer formed to cover the ink layer.

4. The standing pouch according to any one of claims 1 to 4, wherein the third heat seal layer is in direct contact with a surface of the third substrate.

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