JP3204671U - Double-layer paper bag - Google Patents

Abstract

The present invention relates to a two-layer structure paper bag that can be used as a heavy wrapping paper bag for containing powder particles and the like. A two-layer paper bag having a sealing portion on one end and a filling port on the other end, the two-layer paper bag having a two-layer structure of an inner paper base and an outer paper base. In the body portion of the bag, the inner side surface of the outer paper base and the outer side surface of the inner paper base are partially joined by an adhesive. is there. [Selection] Figure 1

Description

  The present invention relates to a two-layer paper bag. More specifically, the present invention relates to a two-layer structure paper bag that can be used as a heavy wrapping paper bag for containing powder and the like.

  Heavy wrapping paper bags are used in a wide range of applications such as grains such as rice and wheat, agricultural products such as potatoes and carrots, industrial powders such as fertilizers, chemicals, cement and gypsum, and wastes. Kraft paper is used as the paper packaging bag. For example, in the case of a heavy packaging paper bag filled with inclusions exceeding 30 kg, three or more layers of kraft paper are used. However, heavy wrapping paper bags laminated in three or more layers are difficult to fold small and become waste after use, so the heavy wrapping paper bags laminated in two layers should exceed 30 kg Thus, there is a demand for a heavy wrapping paper bag that can endure even when it is filled with various interior items.

JP 2007-91326 A Utility Model Registration No. 3189865

Patent Document 1 proposes a wrapping paper bag having a high-strength two-layer structure by using kraft stretch paper, but is special kraft paper with a tensile elongation at break of 10% or more, and is expensive. . Patent Document 2 proposes a heavy wrapping paper bag including a reinforcing sheet between kraft papers. However, since the structure is complicated, it is difficult to manufacture and becomes an expensive heavy wrapping paper bag.
However, in the case of a heavy wrapping paper bag in which kraft paper is simply made into a two-layer structure, if the bag is dropped with the contents filled, the bag may tear and the contents may come out. The present invention, etc. uses kraft paper and intensive research to provide a double-layered heavy-duty wrapping paper bag that can withstand even if a falling bag occurs, and by using an adhesive to reinforce kraft paper I found that I could achieve it.

The two-layered paper bag using the paper base material of the present invention is as follows.
(1) A two-layer structure paper bag having a sealing part on one end side and a filling port on the other end side,
This two-layer paper bag has a two-layer structure consisting of an inner paper base and an outer paper base.
A double-layered paper bag, wherein an inner surface of the outer paper base and an outer surface of the inner paper base are partially joined by an adhesive in a body portion of the bag.

(2) A two-layer structure paper bag having a sealing part on one end side and a filling port on the other end side,
This two-layer paper bag has a two-layer structure consisting of an inner paper base and an outer paper base.
In the body portion of the bag, the inner surface of the outer paper base and the outer surface of the inner paper base are joined by a plurality of strip-shaped adhesives provided in the width direction of the bag. Structure paper bag.
(3) The two-layer structure paper bag according to (2), wherein the width of the belt-like adhesive is 3 mm to 40 mm.
(4) The two-layer structure paper bag according to (2) or (3), wherein the interval between the belt-like adhesive adjacent to the belt-like adhesive is wider than the width of the belt-like adhesive.

(5) A two-layer structure paper bag having a sealing part on one end side and a filling port on the other end side,
This two-layer paper bag has a two-layer structure consisting of an inner paper base and an outer paper base.
A two-layered paper bag, characterized in that a force transmission means is provided on an inner surface of the outer paper base and an outer surface of the inner paper base in a body portion of the bag.

(6) A two-layer structure paper bag having a sealing part on one end side and a filling port on the other end side,
This two-layer paper bag has a two-layer structure consisting of an inner paper base and an outer paper base.
In the body portion of the bag, the inner surface of the outer paper base and the outer surface of the inner paper base are joined together by a plurality of belt-shaped force transmitting means provided in the width direction of the bag. Layered structure paper bag.
(7) The two-layer structure paper bag according to (6), wherein the width of the belt-like force transmission means is 3 mm to 40 mm.
(8) The two-layer structure paper bag according to (6) or (7), wherein the interval between the belt-like force transmission means and the adjacent belt-like force transmission means is wider than the width of the belt-like force transmission means.

(9) The two-layer structure paper bag according to any one of (1) to (8), wherein the inner paper base and the outer paper base are both craft paper.
(10) The double-layered paper bag according to any one of (1) to (9), wherein the outer paper base has a tensile strength in the longitudinal direction of the bag of 5 kN / m or more.
(11) The double-layered paper bag according to any one of (1) to (10), wherein the outer paper base has a tensile breaking elongation in the lateral direction of the bag of 5.0% or more.
(12) The two-layer structured paper bag according to any one of (1) to (11), wherein both the inner paper base and the outer paper base have a basis weight of 85 g / m ² or less.

(13) The two-layer structure paper bag according to any one of (1) to (12), wherein the two-layer structure paper bag has a length of 700 mm or more and 1000 mm or less, and a trunk width of 360 mm or more and 600 mm or less.
(14) The two-layer structure paper bag according to any one of (1) to (13), wherein the two-layer structure paper bag is a heavy wrapping paper bag and has a single-bottom beam structure with a paper band.

  The double-layered paper bag of the present invention is a double-layered bag made of kraft paper, and can be used with confidence because it is a structure that does not tear even if it is filled with 30 kg of rice and dropped. .

It is a three-dimensional projection figure showing the external appearance in the use condition of one Embodiment which applied the double layer structure paper bag by this invention to the rice bag. It is the three-dimensional projection figure which looked at the external appearance of the rice bag shown in FIG. 1 from the filling port side. It is the three-dimensional projection figure which looked at the external appearance of the rice bag shown in FIG. 1 from the sealing part side. It is sectional drawing along the IV-IV arrow in FIG. It is sectional drawing along the VV arrow in FIG. It is a schematic diagram which shows the state which the inner surface of the outer side paper base material 13 and the outer side surface of the inner side paper base material 14 which comprise a rice bag joined by the adhesive agent area | region 15a. It is a schematic diagram which shows the state which provided the force transmission means 15b in the inner surface of the outer side kraft paper 13 and the outer side surface of the inner side kraft paper 14 which comprise a rice bag. It is explanatory drawing the trunk | drum part of the rice bag of this invention, ie, the part which provides an adhesive agent. It is a schematic diagram explaining the area | region which provided the adhesive agent of the trunk | drum part of the rice bag used as the embodiment of this invention. It is a schematic diagram explaining the area | region which provided the adhesive agent of the trunk | drum part of the rice bag used as the other embodiment of this invention. It is a schematic diagram explaining the area | region which provided the adhesive agent of the trunk | drum part of the rice bag used as the other embodiment of this invention. It is a schematic diagram explaining the area | region which provided the adhesive agent of the trunk | drum part of the rice bag used as the other embodiment of this invention. It is a schematic diagram explaining the area | region which provided the adhesive agent of the trunk | drum part of the rice bag used as the other embodiment of this invention. It is a schematic diagram explaining the area | region which provided the adhesive agent of the trunk | drum part of the rice bag used as the other embodiment of this invention. It is a schematic diagram explaining the area | region which provided the adhesive agent of the trunk | drum part of the rice bag used as the other embodiment of this invention. It is a schematic diagram explaining the area | region which provided the adhesive agent of the trunk | drum part of the rice bag used as the other embodiment of this invention. It is a schematic diagram explaining the area | region which provided the adhesive agent of the trunk | drum part of the rice bag used as the other embodiment of this invention.

  An embodiment in which the two-layer paper bag according to the present invention is applied to a 30 kg rice bag (heavy wrapping paper bag) will be described in detail with reference to FIGS. However, the present invention is not limited to such an embodiment, and the filling port, the sealing port, and the like can be arbitrarily changed to a conventionally known configuration in accordance with the type of the filling material and the usage form thereof.

As schematically shown in FIG. 1 showing the use state of the rice bag according to the present embodiment and FIGS. 2 and 3 respectively showing the appearance of the rice bag, the rice bag 10 in the present embodiment has a sealing portion 11 on one end side and the other end. A pleated single-bottom beam structure having a side filling port 12 is employed. 4 is a sectional view taken along the line IV-IV in FIG. 2, and FIG. 5 is a sectional view taken along the line VV in FIG.
The rice bag 10 includes an inner paper base 14 and an outer paper base 13. Although the bonding part 13g of the outer side paper base material 13 and the bonding part 14g of the inner side paper base material 14 are arranged on the back surface 10R side of the rice bag 10, these two bonding parts 13g and 14g are mutually connected. It is formed by shifting along the width direction of the rice bag 10 so as not to overlap.

In the first embodiment of the present invention, as shown in FIG. 6, the inner surface of the outer paper base 13 and the outer surface of the inner paper base 14 are joined by an adhesive 15a in the body portion of the rice bag. .
As shown in FIGS. 6, 9, 10, and 14, the second embodiment of the present invention is such that the inner surface of the outer paper base 13 and the outer surface of the inner paper base 14 are in the bag portion of the rice bag. Are joined by a strip-like adhesive 15a in the width direction.
In the third embodiment of the present invention, as shown in FIG. 7, force transmission means 15b is provided on the inner surface of the outer paper base 13 and the outer surface of the inner paper base 14 in the body portion of the rice bag. Yes.
As shown in FIGS. 7, 9, 10, and 14, the fourth embodiment of the present invention has a bag on the inner surface of the outer paper base 13 and the outer surface of the inner paper base 14 in the body portion of the rice bag. A belt-like force transmission means 15b is provided in the width direction.

In addition, the trunk | drum part of the bag said by this invention is the area | region of the part between the sealing part of the one end side of a bag, and the filling port of the other end side, and when shown in FIG. 8, the trunk | drum part 10a becomes the area | region. .
Hereinafter, the adhesive 15a and the force transmission means 15b may be collectively referred to as an adhesive region 15.

  9 to 17 schematically show the arrangement of the adhesion region 15. In addition, the vicinity of the sealing part and filling port of the rice bag 10 is not illustrated. The method of providing the adhesion region is not particularly limited, but is preferably provided at two or more locations. Moreover, it is preferable to provide both the front surface and the back surface. For example, the adhesion region 15 may be provided continuously in the width direction as shown in FIG. 9, or may be provided intermittently in the width direction as shown in FIG. Moreover, you may provide in the vertical direction like FIG.11 and FIG.12. Furthermore, you may provide an adhesion | attachment area | region in the shape like FIGS. In particular, as shown in FIG. 9, FIG. 10, or FIG. The band-like width is about 3 mm to 40 mm, preferably 4 to 30 mm, and more preferably 5 to 20 mm. It is preferable that the distance between the belt-like adhesive region and the belt-like adhesive region adjacent to the belt-like adhesive region is wider than the width of the belt-like adhesive region, because the strength and cost are excellent.

  Bonding with the adhesive 15a may be performed by pressure bonding using an adhesive. The adhesive is not particularly limited, and water-soluble adhesives, emulsion-type adhesives, hot-melt adhesives, double-sided tapes, and the like can be used as appropriate. Specific examples include polyvinyl alcohols, starches, celluloses such as carboxymethyl cellulose, polyvinyl acetates, and latexes. Note that the adhesive contains a pressure-sensitive adhesive. Of these, latexes are preferable because of excellent initial adhesiveness. The method of providing the adhesive 15a is not particularly limited, but it can be applied by, for example, a flexo method.

  The force transmission means 15b may have a function of connecting the outer paper base and the inner paper base, so that the stress to the inner paper base transmitted from the filled contents is transmitted to the outer paper base. Although a force transmission means is not specifically limited, For example, what is necessary is just to join using an adhesive agent. The adhesive is not particularly limited, and water-soluble adhesives, emulsion-type adhesives, hot-melt adhesives, double-sided tapes, and the like can be used as appropriate. Specific examples include polyvinyl alcohols, starches, celluloses such as carboxymethyl cellulose, polyvinyl acetates, and latexes. The adhesive contains a pressure-sensitive adhesive, and it is particularly preferable to use a pressure-sensitive adhesive having viscosity. The method of providing the force transmission means 15b is not particularly limited, but when an adhesive is used, it can be applied by, for example, a flexo method.

The inner paper base and the outer paper base are not particularly limited as long as they can be used in packaging bags. Known substrates such as fine paper, art paper, coated paper and kraft paper can be used, but kraft paper is suitable in terms of strength. As the kraft paper, known ones can be used. For example, bleached kraft paper, unbleached kraft paper, single gloss kraft paper, kraft stretched paper, etc. can be used as appropriate. In particular, when this bonding is used for kraft paper having low strength, for example, kraft paper having a basis weight of 85 g / m ² or less, the improvement effect is great. For example, even a kraft paper having a basis weight of 81 g / m ² or less can provide a heavy wrapping paper bag with sufficient strength. The effect can be obtained even at 78 g / m ² or less. In addition, the lower limit value of the basis weight is not particularly limited, but a basis weight of 69 g / m ² or more is preferable.

  Examples of kraft paper pulp include softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood unbleached kraft pulp (NUKP), hardwood unbleached kraft pulp (LUKP), and softwood semi-bleached kraft pulp (NSBKP). ), Chemical pulp such as hardwood semi-bleached kraft pulp (LSBKP) is used, but waste paper pulp manufactured from waste tea paper or kraft envelope waste paper may also be used. Further, Stone Grand Pulp (SGP), Pressurized Stone Grand Pulp (PGW), Refiner Grand Pulp (RGP), Thermo Grand Pulp (TGP), Chemi Grand Pulp (CGP), Ground Wood Pulp (GP), Thermo Mechanical Pulp (TMP) ) And other known pulps such as waste paper pulp may be used in combination. Among them, it is preferable to use softwood kraft pulp as a main component, such as NBKP, NUKP, NSBKP, and particularly preferable to use NUKP.

  The tensile strength of the paper substrate in the longitudinal direction of the bag, that is, in the direction of the sealing portion on one end side of the bag-filling port on the other end side is preferably 4 kN / m or more, more preferably 5 kN / m or more, and 6 kN / m or more is more preferable. Since the tensile strength of the paper base material in the width direction of the bag, that is, the direction perpendicular to the direction of the sealing portion at one end of the bag-the filling port at the other end has a reinforcing effect by the adhesive, 2.3 kN / m or more is sufficient, 2.6 kN / m or more is more preferable, and 3.0 kN / m or more is even more preferable. In addition, the tensile strength said here is prescribed | regulated to JISP8113.

  The size of the bag varies depending on the application and is not particularly limited. In the case of a heavy wrapping paper bag such as a rice bag, there is no particular limitation as long as it can contain rice having a weight of 20 kg, 30 kg, etc. The length of the heavy wrapping paper bag is 750 mm or more, and the trunk width is 400 mm or more. Preferably there is. The upper limit is not particularly limited, but from the viewpoint of handling, the length of the bag is preferably 1000 mm or less, and the body width is preferably 600 mm or less.

  In addition, you may have a printing part which printed the logo mark, the photograph, the design, the content, the producer, etc. suitably on the surface or back surface of the two-layer structure paper bag of this invention. In addition, in order to make the bag difficult to slip, an anti-slip treatment with a known anti-slip agent such as a colloidal silica-based inorganic material or a styrene / acrylic polymer may be performed.

  The present invention will be described below with specific examples, but the present invention is not limited by these.

"Comparative Example 1"
A commercially available kraft paper was prepared as a paper substrate. The kraft paper was used for the inner paper base and the outer paper base to produce a heavy wrapping paper bag (rice bag) shown in FIGS. The width of the bag was 490 mm and the length was 800 mm. The physical properties of the used kraft paper were a basis weight of 75.7 g / m ² , and the tensile strength was 4.83 kN / m in the longitudinal direction of the bag and 2.57 kN / m in the lateral direction. The tensile strength was measured based on JIS P8113.
The inner paper base and the outer paper base are not joined with an adhesive.

"Example 1"
As shown in FIG. 9, a heavy wrapping paper bag in which the inner paper base and the outer paper base were joined with an adhesive was obtained. As an adhesive, carboxymethylcellulose (trade name: Tokino 9C, manufactured by Nichirin Chemical Industry Co., Ltd.) is used, and it is a flexo system. The adhesive area is a band, its width is 10 mm, and the amount of adhesion is a dry weight per bag. It was set to 2 g / m ² . The distance between the bonding area and the adjacent bonding area was about 200 mm.

"Example 2"
As shown in FIG. 10, a heavy wrapping paper bag in which the inner paper base and the outer paper base were joined with an adhesive was obtained. The type of adhesive, the amount of adhesion, and the width of the adhesive region are the same as in Example 1.

"Example 3"
As shown in FIG. 11, a heavy wrapping paper bag in which the inner paper base and the outer paper base were joined with an adhesive was obtained. The type of adhesive, the amount of adhesion, and the width of the adhesive region are the same as in Example 1.

Example 4
As shown in FIG. 12, a heavy wrapping paper bag in which the inner paper base and the outer paper base were joined with an adhesive was obtained. The type of adhesive, the amount of adhesion, and the width of the adhesive region are the same as in Example 1.

The obtained heavy wrapping paper bag was filled with 30 kg of rice, the filling port was tied, and the state shown in FIG. 1 was obtained.
The filled bag was placed in a horizontal state (the back surface 10R of the bag was the bottom surface) and dropped from a position with a height of 1.2 m. This drop test was performed according to JIS Z0217. The test results are shown in Table 1.

  Thus, although it is a heavy wrapping paper bag using the same kraft paper, each embodiment in which the inner surface of the outer paper base and the outer surface of the inner paper base are joined by an adhesive in the trunk portion of the bag, It can be seen that the durability by the drop test is improved. Especially, what was joined by the strip | belt-shaped adhesive area | region in the width direction was the outstanding durability with respect to fall.

DESCRIPTION OF SYMBOLS 10 Rice bag 10F The surface of rice bag 10R The back surface of rice bag 10a The trunk part of rice bag 11 Sealing part 12 Filling port 13 Outer paper base material 13F Outer paper base surface 13R Outer paper base back surface 13g Outer paper base bonding part 14 Inner paper substrate 14F Inner paper substrate surface 14R Inner paper substrate back surface 14g Inner paper substrate bonding part 15 Adhesive region (adhesive region or force transmission means)
15a Adhesive region 15b Force transmission means 16 Mouth string 17 Folded part

Claims (14)

A two-layer structure paper bag having a sealing part on one end side and a filling port on the other end side,
This two-layer paper bag has a two-layer structure consisting of an inner paper base and an outer paper base.
A double-layered paper bag, wherein an inner surface of the outer paper base and an outer surface of the inner paper base are partially joined by an adhesive in a body portion of the bag. A two-layer structure paper bag having a sealing part on one end side and a filling port on the other end side,
This two-layer paper bag has a two-layer structure consisting of an inner paper base and an outer paper base.
In the body portion of the bag, the inner surface of the outer paper base and the outer surface of the inner paper base are joined by a plurality of strip-shaped adhesives provided in the width direction of the bag. Structure paper bag. The double-layered paper bag according to claim 2, wherein the width of the belt-like adhesive is 3 mm to 40 mm. The two-layered paper bag according to claim 2 or 3, wherein a distance between the belt-like adhesive adjacent to the belt-like adhesive is wider than the width of the belt-like adhesive. A two-layer structure paper bag having a sealing part on one end side and a filling port on the other end side,
This two-layer paper bag has a two-layer structure consisting of an inner paper base and an outer paper base.
A two-layered paper bag, characterized in that a force transmission means is provided on an inner surface of the outer paper base and an outer surface of the inner paper base in a body portion of the bag. A two-layer structure paper bag having a sealing part on one end side and a filling port on the other end side,
This two-layer paper bag has a two-layer structure consisting of an inner paper base and an outer paper base.
In the body portion of the bag, the inner surface of the outer paper base and the outer surface of the inner paper base are joined together by a plurality of belt-shaped force transmitting means provided in the width direction of the bag. Layered structure paper bag. The double-layered paper bag according to claim 6, wherein the width of the belt-like force transmission means is 3 mm to 40 mm. The double-layer structure paper bag according to claim 6 or 7, wherein a distance between the belt-like force transmission means and the adjacent belt-like force transmission means is wider than a width of the belt-like force transmission means. The two-layer structure paper bag according to any one of claims 1 to 8, wherein the inner paper base and the outer paper base are both craft paper. The double-layered paper bag according to any one of claims 1 to 9, wherein the outer paper base has a longitudinal tensile strength of the bag of 5 kN / m or more. The double-layered paper bag according to any one of claims 1 to 10, wherein the outer paper base has a tensile elongation at break in the lateral direction of the bag of 5.0% or more. The two-layer structure paper bag according to any one of claims 1 to 11, wherein each of the inner paper base and the outer paper base has a basis weight of 85 g / m ² or less. The two-layer structure paper bag according to any one of claims 1 to 12, wherein the two-layer structure paper bag has a length of 700 mm or more and 1000 mm or less, and a trunk width of 360 mm or more and 600 mm or less. The two-layer structure paper bag according to any one of claims 1 to 13, wherein the two-layer structure paper bag is a heavy wrapping paper bag and has a single-bottom beam structure with a paper band.

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