JP2021084664A - Package for paper product - Google Patents

Abstract

To provide a package for a paper product in which packaged contents are hard to collapse (easy to take out) even when the packaged object is a paper product, particularly a paper product such as thin paper.SOLUTION: A package covers entire one or more paper products with a packaging base material having four mountain folding portions substantially parallelly extending in one direction, and seals with seal portions, the one or more paper products. The seal portions are provided respectively at both ends of the mountain folding portions, each of which is substantially straight and orthogonal to the direction of the mountain folding portions, and the respective seal portions are formed substantially parallel to each other, and when in the packaging base material, a distance between the mountain folding portions in the central part of the mountain folding portion in a direction orthogonal to a straight direction of the seal portion is defined as A, and in the one or more paper products, a length of the paper product in a direction perpendicular to both the straight direction of the seal portions and a straight direction of the mountain folding portions is defined as B, a ratio of B to A (B/A(%)) is 78% or more and 130% or less.SELECTED DRAWING: Figure 1

Description

The present invention relates to a paper product packaging body suitable for packaging paper products, particularly paper products such as tissue paper.

Conventionally, there are known packaging bodies that contain roll-shaped paper products such as toilet paper and kitchen paper, and laminated paper products such as tissue paper and wipers as objects to be packaged.

As a packaging body for packaging roll-shaped paper products, for example, in Patent Document 1, a gusset (gusset) is symmetrically folded into a tubular film such as polyethylene to form a main body, and the upper portion thereof is folded flat to form a grip portion. Is disclosed.

On the other hand, as a wrapping body for packaging laminated paper products, a paper carton made of paperboard having a high basis weight is generally used. Further, as a packaging body that replaces the paper carton, for example, Patent Document 2 discloses a film packaging body in which a perforation is provided in the center of the upper surface of a packaging bag made of a flexible resin film. There is.

Japanese Unexamined Patent Publication No. 2004-269010 Japanese Unexamined Patent Publication No. 2016-188092

However, there has been a demand for a new package containing the above-mentioned paper products, particularly paper products such as tissue paper, as objects to be packaged. In particular, due to the growing awareness of environmental issues in recent years, it is desired to reduce the use of plastic (synthetic resin), and even for paper packaging, it is desired to reduce the amount of packaging material. In particular, when soft paper products such as tissue paper are used as packages, they are difficult to achieve.

Further, especially in the case of a resin film, although it is flexible, it generally easily loses its shape, and the situation when the paper product to be packaged is packaged / sealed and transported or used, especially the load from the outside is packaged. It tends to affect the condition of paper products in the body. For example, if the package is opened and used with strong force, the shape of the package will be greatly deformed, and as a result, the paper product to be packaged will also be in a state of being deformed, and it will be difficult to remove it when it is taken out from the package and used. May not be suitable for.

The present invention has been made in view of such circumstances, and an object of the present invention is to prevent the contents of the packaged object from collapsing even when a paper product, particularly a paper product such as tissue paper, is packaged. An object of the present invention is to provide a packaging for paper products (easy to take out).

In view of the above problems, the inventors of the present invention have conducted diligent research. As a result, in the center of the mountain fold portion of the packaging base material, the distance between the mountain fold portions in the direction orthogonal to the linear direction of the seal portion, the linear direction of the seal portion in the paper product, and the mountain fold portion. By specifying the ratio of the lengths of the paper products in the direction orthogonal to any of the linear directions, the contents of the packaged object will collapse even when the packaged object is a paper product, especially a paper product such as tissue paper. We have found that it is possible to make a packaging for paper products that is difficult (easy to take out) and solve the above problems, and have completed the present invention.
Specifically, the present invention provides the following.

(1) The first aspect of the present invention is a packaging base material having four substantially parallel mountain folds extending in one direction, and the entire one or more paper products are covered, and the paper products are sealed by the seal portions. The wrapping body is provided, and each of the mountain folds has a ruled line. The packaging base material contains at least a paper base material and a sealing layer, and the basis weight of the packaging base material is 35 g. / ^{M 2} or more and 105 g / m ² or less, and the seal portions are provided at both ends of the mountain fold portion, both of which are substantially straight lines orthogonal to the direction of the mountain fold portion, and each seal portion is approximately. The distance between the mountain folds formed in parallel and in the central portion of the mountain fold portion of the packaging base material in the direction orthogonal to the linear direction of the seal portion is defined as A, and the distance between the mountain folds is defined as A. When the length of the paper product in the direction orthogonal to both the linear direction of the seal portion and the linear direction of the mountain fold portion is defined as B, the ratio of B to A (B / A (%)). However, it is a packaging body for paper products, characterized in that it is 78% or more and 130% or less.
(2) The second aspect of the present invention is the packaging body for paper products according to (1), in which the bending stiffness of the packaging base material in the MD direction is 20 μN · m or more and 330 μN · m or less. It is characterized by.
(3) The third aspect of the present invention is the package for paper products according to (1) or (2), wherein the bending stiffness of the packaging base material in the CD direction is 8 μN ・ m or more and 145 μN ・ m. It is characterized by the following.
(4) A fourth aspect of the present invention is the packaging for paper products according to any one of (1) to (3), wherein the seal layer is a heat seal layer and / or an adhesive layer. It is characterized by that.
(5) A fifth aspect of the present invention is the packaging for paper products according to (4), wherein the heat-sealing layer contains a polyolefin-based resin.
(6) A sixth aspect of the present invention is the packaging for a paper product according to any one of (1) to (5), wherein the paper product is thin paper. ..
(7) A seventh aspect of the present invention is the packaging for paper products according to (6), wherein the thin paper is a laminated thin paper.
(8) An eighth aspect of the present invention is the packaging for paper products according to any one of (1) to (7), wherein the packaging is caramel packaging, gusset packaging, or pillow packaging. It is characterized by that.

According to the present invention, even when a paper product, particularly a paper product such as tissue paper, is used as a package, it is possible to provide a package for a paper product in which the contents of the package are hard to collapse (easy to take out). ..

It is a perspective view which shows an example of the packaging body for a paper product of this invention and a paper product. It is a perspective view which shows an example of the packaging body for a paper product of this invention. It is a perspective view which shows an example of the paper product to be packaged in the packaging body for a paper product of this invention.

Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings, but these are listed for exemplification purposes and do not limit the present invention. ..

1. 1. Packaging for Paper Products FIG. 1 is a perspective view showing an example of a packaging for paper products of the present invention (hereinafter, also simply referred to as “packaging”). As shown in FIG. 1, the packaging body 1 of the present invention is a packaging base material 10 having four substantially parallel mountain fold portions 12 extending in one direction, and the entire one or more paper products 11 are covered with a sealing portion. The paper product 11 is sealed by 13. Further, each of the mountain fold portions 12 has a ruled line, and creases are made along the ruled line. The length of each ruled line may be a part of the mountain fold portion 12, preferably 40% or more, more preferably 60% or more, still more preferably 80% or more. In the package 1, the packaging base material 10 may cover a part of the paper product 11 instead of the whole, and the paper product 11 may not be sealed (not shown).
Further, it is preferable that the package 1 is provided with an outlet for taking out the paper product 11 (not shown). It is preferable that the take-out port is provided so that a cut line such as a perforation is formed on the packaging base material 10 so that the cut line can be cut and opened at the time of use.

The seal portions 13 are provided at both ends of the mountain fold portion 12, and each of the seal portions 13 is formed in a substantially straight line orthogonal to the direction of the mountain fold portion 12 and each seal portion is formed substantially in parallel. The seal portion 13 is provided so as to seal the paper product 11 with a seal layer described later.

The distance between the mountain folds 12 in the central portion of the mountain fold portion 12 of the packaging base material 10 in the direction orthogonal to the linear direction of the seal portion 13 is defined as A, and the straight line of the seal portion 13 in the paper product 11 is defined as A. When the length of the paper product 11 in the direction orthogonal to both the direction and the straight line direction of the mountain fold portion 12 is defined as B, the ratio of B to A (B / A (%)) is 78% or more and 130%. It is preferably 85% or more and 118% or less, and more preferably 92% or more and 109% or less. If the ratio is less than 78%, B with respect to A becomes small, the packaging becomes loose, and the packaging 1 becomes difficult to use (paper product 11 easily collapses and becomes difficult to take out). When the ratio exceeds 130%, B with respect to A becomes large and the packaging becomes tight, the mountain fold portion 12 of the packaging base material 10 does not bend at the ruled line, and the packaging body 1 becomes difficult to use (it is difficult to take out the paper product 11). Become). By setting the ratio of B to A (B / A (%)) within the above numerical range, the paper product 11 can be easily taken out, and the package 1 that is easy to use can be obtained.
The measurement method of A is the distance between the mountain fold portions 12 in the central portion of the mountain fold portion 12 in the direction orthogonal to the linear direction of the seal portion 13 in the package 1 shown in FIG. A1 and a2 are measured, and the average thereof is defined as A. At the time of measurement, the paper product 11 is taken out from the packaging body 1 and measured in a state where the packaging base material 10 is stretched so as not to be affected by the slack of the packaging base material 10 or the paper product 11 or the like inside.

2. Packaging Base Material The packaging base material 10 includes at least a paper base material and a sealing layer. When the paper base material is formed as the package 1, the outer surface side may be printed. Further, the paper base material may be overcoated paper that has been overcoated to ensure waterproofness.

The basis weight of the packaging base material 10 (for example, the total basis weight of the paper base material and the sealing layer) is 35 g / m ² or more and 105 g / m ² or less, and 40 g / m ² or more and 85 g / m ² or less. Is preferable, and more preferably 50 g / m ² or more and 75 g / m ² or less. If the basis weight is ^{less than 35 g / m 2} , the strength of the packaging base material 10 is weak, and the packaging body 1 is easily bent even in a portion other than the mountain fold portion 12, the shape is not stable, and the packaging body 1 becomes difficult to use. (The paper product 11 is easily collapsed, making it difficult to take it out). When the basis weight ^{exceeds 105 g / m 2} , the strength of the packaging base material 10 is strong, and the packaging body 1 is difficult to bend even at the mountain fold portion 12, the shape is not stable, and the packaging body 1 becomes difficult to use (that is, paper). Product 11 tends to crumble, making it difficult to remove). When the basis weight of the packaging base material 10 is within the above range, the paper product 11 can be easily taken out, and the packaging body 1 that is easy to use can be obtained.

(1) Paper base material The paper base material is produced using wood pulp as a main raw material. The pulp here includes coniferous kraft pulp, broadleaf kraft pulp, crushed wood pulp, thermomechanical pulp, chemithermomechanical pulp, newspapers, leaflets, redesigned magazines, coated magazines, heat-sensitive recording paper, pressure-sensitive recording paper, and imitation. Conventionally known pulp such as paper, high-quality colored paper, copy paper, computer output paper, or used paper pulp such as mixed used paper thereof can be used alone or mixed at an arbitrary blending ratio. ..

In the paper base material of the package 1 of the present invention, the pulp used is preferably 50 to 100% by weight of coniferous kraft pulp and 0 to 50% by weight of broadleaf kraft pulp, and 70 to 100% by weight of coniferous kraft pulp and broadleaf tree. It is more preferably 0 to 30% by weight of kraft pulp, and further preferably 90 to 100% by weight of coniferous kraft pulp and 0 to 10% by weight of broadleaf kraft pulp. By blending the pulp as described above, the mountain fold portion 12 of the package 1 is easily bent by the ruled line, and the contents of the packaged object (paper product 11) are less likely to collapse. Further, it is preferably unbleached pulp.

A material other than pulp fiber may be blended in the pulp slurry as an auxiliary material. In the package 1, the content ratio of the pulp fiber is usually preferably 70% by weight or more and 100% by weight or less, more preferably 80% by weight or more and 100% by weight or less, and 90% by weight or more and 100% by weight or less. The following is more preferable. By setting the pulp content as described above, the mountain fold portion 12 of the package 1 is easily bent by the ruled line, and the contents of the packaged object (paper product 11) are less likely to collapse. In addition, the strength of the packaging base material 10 becomes appropriate, and packaging becomes easy.

The cooking method and the bleaching method in pulp production are not particularly limited.

Further, as necessary, various commonly used additives such as a wet paper strength improver, a filler, a sizing agent, a dry paper strength enhancer, a yield improver, a coloring pigment, etc. are used for the paper base material. May be added in an appropriate amount as appropriate.

The wet paper strength improving agent can be selected and used from commonly used known ones. For example, it is preferable to select from polyamide / polyamine-based resin, polyacrylamide-based resin, melamine-based resin and the like. The blending amount (mass in the absolutely dry state) of such a wet paper strength improving agent is usually 0.01% by weight or more of the wet paper strength improving agent with respect to the pulp (mass in the absolutely dry state). It is preferably 7% by weight or less, preferably 0.02% by weight or more and 0.5% by weight or less, and more preferably 0.03% by weight or more and 0.3% by weight or less. Even if the blending amount of the wet paper strength improving agent exceeds 0.7% by weight, it becomes difficult to obtain an effect commensurate with the blending amount, resulting in an increase in cost and a decrease in releasability, resulting in the packaging of the present invention. It may be difficult to reuse body 1 later. Further, if the blending amount of the wet paper strength improving agent is less than 0.01% by weight, it becomes difficult to obtain sufficient wet paper strength, and when it gets wet with water, it is easily torn and the function as a package may be inferior.

In the packaging body 1 of the present invention, these raw materials can be made by a normal papermaking process to obtain a paper base material of the packaging base material 10.

The basis weight of the paper substrate of the packaging substrate 10, more preferably is preferably 25 g / ^{m 2} or more 88 g / ^{m 2} or less, 30 g / ^{m 2} or more 72 g / ^{m 2} or less, 40 g / ^{m 2} It is more preferably 56 g / m ² or less. When the basis weight of the paper base material is within the above range, the mountain fold portion 12 of the package 1 is easily bent by the ruled line, and the contents of the packaged object (paper product 11) are less likely to collapse. In addition, it becomes easy to achieve all of the required flexibility, softness, and strength of the packaging base material while suppressing the amount of the paper base material used.

The basis weight of the paper base material can be obtained, for example, as follows when the seal layer is a heat seal layer described later.
First, a 0.1 M acetic acid aqueous solution and a 0.1 M sodium acetate aqueous solution are prepared. About 830 g of a 0.1 M acetic acid aqueous solution and about 160 g of a 0.1 M sodium acetate aqueous solution are mixed so that the pH becomes 4, and this is used as an acetic acid buffer solution. Cellulase Onozuka p1500 (manufactured by Yakult Co., Ltd.) is added to this acetate buffer so that the addition amount is 1% by weight.
50 ml of an acetate buffer solution to which Cellulase Onozuka p1500 is added and 0.5 g of a packaging base material 10 (paper base material on which a heat seal layer is formed) are placed in a vial and the lid is tightly closed. After shaking at 180 rpm and 40 ° C. for 24 hours, the heat seal layer is collected from the vial and the mass of the heat seal layer portion is measured. From the mass (0.5 g) of the packaging base material 10 and the mass of the collected heat seal layer, the basis weight of the paper base material is calculated by the following formula.
Basis weight of paper base material =
Basis weight of packaging base material 10 × [(mass of packaging base material 10-mass of heat seal layer) / mass of packaging base material 10]

The ratio of the basis weight of the paper base material to the basis weight of the packaging base material 10 (for example, the total basis weight of the paper base material and the sealing layer) may be 51% or more and 100% or less, but is usually 60% or more. It is more preferably 95% or less, and further preferably 70% or more and 90% or less. Within the above range, the mountain fold portion 12 of the package 1 is easily bent by the ruled line, and the contents of the packaged object (paper product 11) are less likely to collapse. In addition, the ease of packaging for the soft paper product 11 can be ensured, and good heat sealability or adhesiveness can be ensured.

(2) Seal Layer In the packaging body 1 of the present invention, the packaging base material 10 includes a seal layer in addition to the paper base material, and the seal layer is preferably a heat seal layer and / or an adhesive layer. The packaging base material 10 of the present invention is, for example, a paper base material / heat seal layer, a paper base material / adhesive layer, a paper base material / heat seal layer / adhesive layer, a paper base material / adhesive layer / heat seal layer. It is possible to take a layered structure such as.

(2-1) Heat Sealing Layer In the packaging body 1 of the present invention, even if the heat sealing layer is formed on the entire surface of the paper base material, a part of the surface, for example, the paper base materials are laminated and bonded to each other. It may be formed only on a portion. The position and size of the heat seal layer formed on the surface of the paper base material, and the proportion occupied by the heat seal layer can be appropriately set.

The material constituting the heat seal layer is not particularly limited, and any material exhibiting various heat seal properties can be used. For example, a polyolefin resin, another thermoplastic resin, or the like can be used. .. Among these, it is preferable to use a polyolefin resin. Examples of such materials include low-density polyethylene, linear low-density polyethylene, high-density polyethylene, ethylene-α / olefin copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, and ethylene. -Ethyl acrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, ionomer, amorphous polyester, polypropylene, styrene-acrylic copolymer, propylene-ethylene copolymer (preferably) Copolymers with an ethylene content of 10 mol% or less), or polypropylene-based resins obtained by graft-polymerizing or copolymerizing unsaturated carboxylic acids, unsaturated carboxylic acid anhydrides, ester monomers, etc. with polypropylene, medium-density polyethylene, etc. High-density polyethylene or the like can be used. As the material constituting the heat seal layer, any one type may be used alone, or two or more types may be used in combination.

The heat seal layer is a commonly used method, for example, a method of forming a film of a thermoplastic resin such as a polyolefin resin or a composition containing a thermoplastic resin on a paper substrate by an extrusion method, a known heat seal processing apparatus ( A method of attaching a film made of a thermoplastic resin or containing a thermoplastic resin to a paper base material using a laminating treatment device), a thermoplastic resin or a thermoplastic resin composition dissolved or dispersed in water. A water-based heat sealant or a solvent-based heat sealant in which a thermoplastic resin or a thermoplastic resin composition is dissolved or dispersed in a solvent is applied onto a paper substrate by a known method such as roll coating, gravure roll coating, or kiss coating. It can be formed by a coating method or the like.

The basis weight of the heat seal layer ^{is preferably 50 g / m 2} or less, more preferably 5 g / m ² or more and 35 g / m ² or less, and 10 g / m ² or more and 20 g / m ² or less. More preferred. When the basis weight of the heat seal layer is within the above range, the mountain fold portions 12 of the package 1 are easily bent by the ruled lines, and the contents of the packaged object (paper product 11) are less likely to collapse. Further, all of the required flexibility, softness, and strength of the packaging base material can be better achieved, and the sealing property and heat-sealing strength of the packaging body 1 tend to be easily secured.

Further, as described above, the package 1 of the present invention preferably includes an outlet for taking out the paper product 11, and the outlet is formed with a cut line such as a perforation, and the cut line can be cut out to open. It is preferable to do so. The take-out port is required to be easy to open and difficult to tear, but the packaging body 1 that wraps the soft paper product 11 is difficult to open depending on how the force is applied when opening the take-out port, or the take-out port is torn. It may get stuck. The heat seal layer is taken out by setting the basis weight to preferably 50 g / m ² or less, more preferably 5 g / m ² or more and 35 g / m ² or less, and further preferably 10 g / m ² or more and 20 g / m ² or less. It is possible to achieve both ease of opening when opening the mouth and difficulty of tearing.

The basis weight of the heat seal layer can be obtained, for example, as follows.
First, a 0.1 M acetic acid aqueous solution and a 0.1 M sodium acetate aqueous solution are prepared. About 830 g of a 0.1 M acetic acid aqueous solution and about 160 g of a 0.1 M sodium acetate aqueous solution are mixed so that the pH becomes 4, and this is used as an acetic acid buffer solution. Cellulase Onozuka p1500 (manufactured by Yakult Co., Ltd.) is added to this acetate buffer so that the addition amount is 1% by weight.
50 ml of an acetate buffer solution to which Cellulase Onozuka p1500 is added and 0.5 g of a packaging base material 10 (paper base material on which a heat seal layer is formed) are placed in a vial and the lid is tightly closed. After shaking at 180 rpm and 40 ° C. for 24 hours, the heat seal layer is collected from the vial and the mass of the heat seal layer portion is measured. From the mass (0.5 g) of the packaging base material 10 (paper base material on which the heat seal layer is formed) and the mass of the collected heat seal layer, the basis weight of the heat seal layer is calculated by the following formula.
Basis weight of heat seal layer =
Basis weight of packaging base material 10 × (mass of heat seal layer / mass of packaging base material 10)

(2-2) Adhesive Layer In the package 1 of the present invention, the adhesive layer is a part of the surface even if it is formed on the entire surface of the paper base material or the heat seal layer formed on the paper base material. For example, it may be formed only in a portion where the paper base materials are laminated and bonded to each other. The position and size of the adhesive layer formed on the surface of the paper base material, and the proportion occupied by the adhesive layer can be appropriately set.

The adhesive constituting the adhesive layer is not particularly limited, and any known adhesive can be used. For example, an ethylene adhesive, a two-component curable urethane adhesive, a polyester urethane adhesive, or a polyether can be used. Urethane-based adhesives, acrylic-based adhesives, styrene-acrylic adhesives, polyester-based adhesives, polyamide-based adhesives, polyvinyl acetate-based adhesives, epoxy-based adhesives, rubber-based adhesives, etc. can be used. .. Among these, a styrene-acrylic adhesive is preferable.

The adhesive layer is formed by applying an adhesive to a paper base material, a heat seal layer formed on the paper base material, or the like by a known method such as roll coating, gravure roll coating, or kiss coating. can do.

The basis weight of the adhesive layer (dry coating amount of the adhesive) is usually preferably from 2 g / ^{m 2} or more 30 g / ^{m 2} or less, 3 g / ^m, more preferably ² or more 25 g / ^{m 2} or less, 5 g / ^{m 2} or more 20 g / m ² or less is more preferable.
The basis weight of the adhesive layer is calculated by the following formula from the basis weight of the packaging base material 10 and the basis weight of the paper base material measured in accordance with JIS P 8124 before the adhesive layer is provided.
Basis weight of adhesive layer = Basis weight of packaging base material 10-Basis weight of paper base material

As described above, in the packaging base material 10 of the present invention, the seal layer is preferably a heat seal layer and / or an adhesive layer, but usually, a heat seal layer, particularly a polyolefin resin, is more than an adhesive layer. The heat-sealing layer containing the above is more excellent in adhesiveness, and it may be easier to wrap the paper product 11 by providing the heat-sealing layer, preferably the heat-sealing layer containing a polyolefin resin.

(3) Other Layers The packaging base material 10 of the present invention may include other layers in addition to the paper base material and the sealing layer. Examples of other layers include a water vapor barrier layer, an oxygen barrier layer, a printing layer, a printability improving layer, an overprint layer, a light shielding layer, and the like. These other layers can be provided, for example, between the paper base material and the sealing layer, or on the uppermost surface of the packaging base material 10, and may be one layer or two or more layers.

(4) Physical Properties of the entire Packaging Base Material As will be described later, there are various packaging types of the packaging body 1 according to the present invention, and there are cases where the paper product 11 is wrapped from the production line direction (transportation direction; MD direction) and cases where the paper product 11 is wrapped. In some cases, the paper product 11 is wrapped from the width direction (CD direction) orthogonal to the production line direction. When wrapping the paper product 11 from the MD direction, the tensile strength of the packaging base material 10 in the MD direction is preferably 2.0 kN / m or more and 8.0 kN / m or less, and 2.5 kN / m or more and 6.5 kN / m or more. It is more preferably m or less, and further preferably 3.3 kN / m or more and 5.5 kN / m or less. When wrapping the paper product 11 from the CD direction, the tensile strength of the packaging base material 10 in the CD direction is preferably 0.7 kN / m or more and 4.0 kN / m or less, and 0.9 kN / m or more and 3.0 kN / m or less. It is more preferably m or less, and further preferably 1.1 kN / m or more and 2.0 kN / m or less. Within the above range, the mountain fold portion 12 of the package 1 is easily bent by the ruled line, and the contents of the packaged object (paper product 11) are less likely to collapse. The tensile strength of the packaging base material 10 can be measured according to JIS P 8113.

When wrapping the paper product 11 from the MD direction, the breaking elongation of the packaging base material 10 in the MD direction is preferably 0.8% or more and 2.4% or less, and 1.0% or more and 2.1% or less. More preferably, it is more preferably 1.2% or more and 1.8% or less. When the paper product 11 is wrapped from the CD direction, the breaking elongation of the packaging base material 10 in the CD direction is preferably 3.0% or more and 7.0% or less, and 3.5% or more and 6.7% or less. More preferably, it is more preferably 4.0% or more and 6.0% or less. Within the above range, the mountain fold portion 12 of the package 1 is easily bent by the ruled line, and the contents of the packaged object (paper product 11) are less likely to collapse. The elongation at break of the packaging base material 10 can be measured according to JIS P 8113.

When wrapping the paper product 11 from the MD direction, the tear strength of the packaging base material 10 in the MD direction is preferably 300 mN or more and 1600 mN or less, more preferably 450 mN or more and 1200 mN or less, and 580 mN or more and 900 mN or less. Is more preferable. When wrapping the paper product 11 from the CD direction, the tear strength of the packaging base material 10 in the CD direction is preferably 400 mN or more and 3000 mN or less, more preferably 700 mN or more and 2300 mN or less, and 900 mN or more and 1500 mN or less. Is more preferable. Within the above range, even if a ruled line is provided on the mountain fold portion 12 of the package 1, it becomes difficult to tear. The tear strength of the packaging base material 10 can be measured according to JIS P 8116.

The burst strength of the packaging base material 10 is preferably 90 kPa or more and 310 kPa or less, more preferably 120 kPa or more and 260 kPa or less, and further preferably 150 kPa or more and 220 kPa or less. Within the above range, even if a ruled line is provided on the mountain fold portion 12 of the package 1, it is difficult to tear. The burst strength of the packaging base material 10 can be measured according to JIS P 8112.

When wrapping the paper product 11 from the MD direction, the bending stiffness of the packaging base material 10 in the MD direction is preferably 20 μN · m or more and 330 μN · m or less, more preferably 30 μN · m or more and 225 μN · m or less, and 60 μN · m. It is more preferably m or more and 170 μN · m or less. When wrapping the paper product 11 from the CD direction, the bending stiffness of the packaging base material 10 in the CD direction is preferably 8 μN ・ m or more and 145 μN ・ m or less, and more preferably 13 μN ・ m or more and 100 μN ・ m or less. , 20 μN · m or more and 65 μN · m or less is more preferable. When the bending stiffness of the packaging base material 10 in the MD direction or the CD direction is within the above range, the mountain fold portion 12 of the packaging body 1 is easily bent by the ruled line, and the contents of the packaged object (paper product 11) are less likely to collapse. .. In addition, the required flexibility and softness of the packaging base material 10 can be easily achieved, and the shape of the paper product 11 is less likely to collapse even when the paper product 11 is packaged. The bending stiffness of the packaging base material 10 can be measured according to ISO 2493. Since the bending stiffness becomes the strongest when a load is applied in the long axis direction of the fiber, when the fiber orientation ratio is close to 1.0, the bending stiffness in the MD direction tends to be small and the bending stiffness in the CD direction tends to be large. There is.

The thickness of the packaging base material 10 of the present invention is preferably 40 μm or more and 135 μm or less, more preferably 48 μm or more and 110 μm or less, and further preferably 68 μm or more and 90 μm or less. Within the above range, the mountain fold portion 12 of the package 1 is easily bent by the ruled line, and the contents of the packaged object (paper product 11) are less likely to collapse. The thickness of the packaging base material 10 can be measured according to JIS P 8118: 1998. The pressure condition of the pressurized surface was 100 kPa.

The density of the packaging base material 10 ^{is preferably 0.60 g / cm 3} or more and 0.95 g / cm ³ or less, more preferably 0.65 g / cm ³ or more and 0.90 g / cm ³ or less, and 0. and more preferably .70g / cm ³ or more 0.85 g / cm ³ or less. When the density of the packaging base material 10 is within the above range, the mountain fold portion 12 of the packaging body 1 is easily bent by the ruled line, and the contents of the packaged object (paper product 11) are less likely to collapse. In addition, the required strength, suppleness and softness of the packaging base material 10 can be easily achieved. The density of the packaging base material 10 can be measured and calculated in accordance with JIS P 8118: 1998.

For example, when packaging a tissue paper laminate as a paper product 11, the density of the tissue paper laminate ^{is preferably 0.04 g / cm 3} or more and 0.30 g / cm ³ or less, and 0.07 g / cm ³ or more 0. .25g / cm ³ and more preferably less, 0.10 g / cm ³ or more 0.20 g / cm ³ or less is more preferable. In this range, when the tissue paper laminate is packaged using the packaging base material 10 of the present invention, the mountain fold portion 12 of the packaging body 1 is easily bent by the ruled line, and the contents of the object to be packaged (paper product 11) are collapsed. It becomes difficult and easy to wrap. The density of the tissue paper laminate is measured as follows. First, the tissue paper laminate is collected from the package 1, and the mass of the tissue paper laminate is measured at 23 ° C. and 50% after humidity control with an electronic balance. Then, the size (width, depth, height (length of the paper product)) of the tissue paper laminate is measured with a ruler, and the density is calculated by the following formula.
Density of tissue paper laminate (g / cm ³ ) = Mass of tissue paper laminate (g) / (Width of tissue paper laminate (cm) x Depth of tissue paper laminate (cm) x Height of tissue paper laminate (Cm))

3. 3. Paper product FIG. 3 is a perspective view showing an example of a paper product 11 packaged in the packaging body 1 of the present invention. The packaging body 1 of the present invention is particularly suitable for packaging soft paper products such as tissue paper. As the thin paper, the package 1 of the present invention can be particularly preferably applied when packaging laminated thin paper such as tissue paper, wiper, wet tissue, and paper hand towel.

As described above, the length of the paper product 11 in the direction orthogonal to both the linear direction of the seal portion 13 and the linear direction of the mountain fold portion 12 in the paper product 11 is defined as B. As a method for measuring B, b1 to b4, which are the lengths of the four corners of the paper product 11 shown in FIG. 3, are measured, and the average thereof is defined as B. B is preferably 5 mm or more and 200 mm or less, more preferably 10 mm or more and 100 mm or less, and further preferably 20 mm or more and 60 mm or less.

4. Packaging format Examples of the packaging format of the packaging body 1 according to the present invention include caramel packaging, pillow packaging, and gusset packaging.

Caramel packaging is a packaging base material that extends along one direction of the object to be packaged, and the object to be packaged is wound in a direction intersecting this direction, or from one end of the packaging base material formed in a tubular shape in the axial direction. Put the packaged item. Then, of the packaging base materials protruding from both ends of the object to be packaged, the two opposing flap-shaped sides are folded with each other, and then the other two opposing flap-shaped sides are similarly folded with each other, and these folded portions are folded. It is a packaging type in which is sealed by heat fusion or the like. Caramel packaging is preferred for packaging laminated tissue paper. This caramel packaging can be done using known equipment.

Pillow wrapping refers to wrapping an object to be placed on or under a sheet-shaped wrapping base material in a tubular shape by superimposing the wrapping base materials on both inner surfaces at both ends in the width direction. The combined part is formed into a cylindrical shape by heat-sealing, etc., and the bottom part or the mouth part is sealed with a heat-seal, etc. in a single horizontal letter according to the length (height) of the bag. It is a packaging type in which each bag is cut at this sealed portion. This pillow packaging can be done using known equipment.
There are two types of pillow packaging: vertical pillow packaging, in which the packaging base material is sent vertically to wrap the object to be packed while filling it from above, and horizontal pillow packaging, in which the packaging base material is sent horizontally to wrap the object to be packaged. There is. When packaging thin paper, horizontal pillow packaging is preferable from the viewpoint of packaging speed and the form of thin paper.

In gusset packaging, the packaging base material is laminated on the inner surfaces at both ends in the width direction so as to wrap the object to be placed on or under the sheet-shaped packaging base material in a tubular shape, and this stacking is performed. The combined part is formed into a cylindrical shape by heat-sealing, etc., and both ends of the bottom part or the mouth part are woven inward according to the length (height) of the bag to make a gusset, and one horizontal character It is a packaging type that is sealed with a heat seal or the like and cut for each bag at this sealed part. This gusset packaging can be done using known equipment.

In a certain embodiment, for example, when a packaging base material 10 having a bending stiffness in the MD direction of 20 μN ・ m or more and 330 μN ・ m or less is used, the packaging body 1 of the present invention uses, for example, the packaging base material 10 in the form of a continuous sheet. After transporting the paper product 11 and arranging the paper product 11, the paper product 11 is wrapped and wrapped from the transport direction (manufacturing line direction; MD direction), and cut to a predetermined size from the width direction (CD direction) orthogonal to the transport direction. This is particularly preferably applied in the case, that is, when the wrapping direction is the MD direction of the packaging base material 10. In this case, in the packaging body 1 of the present invention, it is preferable to select caramel packaging as the packaging format. The paper product 11 may be arranged after the packaging base material 10 is cut to a predetermined size, or the packaging base material 10 may be cut to a predetermined size after the paper product 11 is arranged.

In another embodiment, for example, when a packaging base material 10 having a bending stiffness in the CD direction of 8 μN ・ m or more and 145 μN ・ m or less is used, the packaging body 1 of the present invention uses, for example, the packaging base material 10 as a continuous sheet. After transporting in the form and arranging the paper product 11, when wrapping the paper product 11 from the width direction (CD direction) orthogonal to the transport direction (manufacturing line direction; MD direction), that is, the wrapping direction is the packaging base. It is particularly preferably applied when the material 10 is in the CD direction. In this case, in the package 1 of the present invention, it is preferable to select gusset packaging or pillow packaging as the packaging type, and gusset packaging is more preferable. In this case as well, the paper product 11 may be placed after the packaging base material 10 is cut to a predetermined size, or the packaging base material 10 may be cut to a predetermined size after the paper product 11 is placed. Good.

Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above-described embodiments and examples. It will be apparent to those skilled in the art that various changes or improvements can be made to the above embodiments. Further, it is clear from the description of the scope of claims that the form to which such a modification or improvement is added may be included in the technical scope of the present invention.

Hereinafter, the present invention will be described in detail with reference to examples. The present invention is not limited to the examples shown below.

In Examples and Comparative Examples, the physical property values of the prepared packaging base materials were measured by the following methods.

(Basis weight of packaging base material)
The basis weight of the packaging base material was measured according to JIS P 8124.

(Basis weight of paper base material and basis weight of heat seal layer)
First, a 0.1 M aqueous acetic acid solution and a 0.1 M sodium acetate aqueous solution were prepared. About 830 g of a 0.1 M acetic acid aqueous solution and about 160 g of a 0.1 M sodium acetate aqueous solution were mixed to adjust the pH to 4, and this was used as an acetic acid buffer solution. Cellulase Onozuka p1500 (manufactured by Yakult Co., Ltd.) was added to this acetate buffer so that the addition amount was 1% by weight.
50 ml of an acetate buffer solution to which Cellulase Onozuka p1500 was added and 0.5 g of a packaging base material (paper base material on which a heat seal layer was formed) were placed in a vial and tightly covered. After shaking at 180 rpm and 40 ° C. for 24 hours, the heat seal layer was collected from the vial and the mass of the heat seal layer portion was measured. From the mass (0.5 g) of the packaging base material (paper base material on which the heat seal layer is formed) and the mass of the collected heat seal layer, the basis weight of the paper base material and the basis weight of the heat seal layer are calculated by the following formulas. Was calculated.
Basis weight of paper base material =
Basis weight of packaging base material x [(mass of packaging base material-mass of heat seal layer) / mass of packaging base material]
Basis weight of heat seal layer =
Basis weight of packaging base material x (mass of heat seal layer / mass of packaging base material)

(Adhesive layer basis weight (adhesive coating amount))
From the basis weight of the packaging base material obtained as described above and the basis weight of the paper base material measured in accordance with JIS P 8124 before providing the adhesive layer, the basis weight of the adhesive layer is calculated by the following formula. Was calculated.
Basis weight of adhesive layer = Basis weight of packaging base material-Basis weight of paper base material

(Thickness of packaging base material)
The thickness of the packaging base material was measured in accordance with JIS P 8118: 1998 using an automatic elevating paper thickness gauge standard model TM-600 (manufactured by Kumagai Riki Kogyo Co., Ltd.). The pressure condition of the pressurized surface was 100 kPa.

(Density of packaging base material)
The density of the packaging base material was measured and calculated in accordance with JIS P 8118: 1998.

(Tensile strength of packaging base material in MD direction and CD direction)
The tensile strength of the packaging base material in the MD direction and the CD direction was measured according to JIS P 8113.

(Breaking elongation of the packaging base material in the MD direction and the CD direction)
The elongation at break in the MD direction and the CD direction of the packaging base material was measured according to JIS P 8113.

(Tear strength of packaging base material in MD direction and CD direction)
The tear strength of the packaging base material in the MD direction and the CD direction was measured according to JIS P 8116.

(Rupture strength of packaging base material)
The burst strength of the packaging substrate was measured according to JIS P 8112.

(Measurement of bending stiffness in the MD direction and CD direction of the packaging base material)
The bending stiffness in the MD direction and the CD direction of the packaging base material was measured by using an L & W bending tester (manufactured by Lorentzen & Wettre) in accordance with the method described in ISO 2493. For the packaging base material, for a test piece having a width of 38 mm and a length of 100 mm, the measured value when the bending angle is 15 degrees and the bending length (span of the sample table) is 10 mm is defined as the bending resistance (load), and the following calculation formula is used. Bending stiffness (μN · m) was determined.
Bending stiffness (μN ・ m) = 60 × bending resistance (mN) × bending length 10 (mm) ² ÷ (π × bending angle 15 (°) × sample width 38 (mm))
If a test piece having a length of 100 mm cannot be collected, the length of the test piece can be shortened. Further, the test piece does not include the perforation of the take-out port, but may include the perforation when it is necessary to include the perforation in order to secure the size of the test piece.

(Example 1)
(Packaging base material)
A paper base material using 100% by weight of unbleached softwood kraft pulp (NUKP) as a pulp raw material was prepared. Then, a polyethylene layer was formed on the paper base material as a heat seal layer by an extrusion method to prepare a packaging base material. Basis weight of the prepared packaging base material, basis weight of the paper base material, and basis weight of the heat seal layer, thickness and density of the packaging base material, tensile strength in the MD direction and the CD direction, breakage in the MD direction and the CD direction. Table 1 shows the results of measuring the elongation, the burst strength, the bending stiffness in the MD direction and the CD direction, and the tear strength in the MD direction and the CD direction.

(Tissue paper packaging (gusset packaging))
Using the prepared packaging base material, a package having a size of 18 cm in the MD direction of the packaging base material × 11 cm in the CD direction of the packaging base material × 5 cm in height was prepared. Then, 50 sets of tissue paper 2ple as a paper product were put into this package and sealed by gusset packaging to obtain a tissue paper package. In addition, the paper product was wrapped and wrapped from the CD direction.
Then, in the tissue paper package, the distance A between the mountain folds and the length B of the paper product (tissue paper) were measured. As described above, the measuring method of A measures a1 and a2, which are the distances between the mountain folds in the central portion of the mountain fold in the direction orthogonal to the linear direction of the seal, and the measurement method thereof. The average was defined as A. At the time of measurement, the tissue paper was taken out from the packaging body and the measurement was performed with the packaging base material stretched so as not to be affected by the looseness of the packaging base material and the tissue paper inside. As a method for measuring B, b1 to b4, which are the lengths of the four corners of the tissue paper, were measured, and the average thereof was defined as B.

(Difficulty of collapsing the packaged object in the package (easy to take out))
Regarding the prepared tissue paper package, 20 monitors evaluated the difficulty of collapsing the tissue paper (easiness of taking out the tissue paper) when the packaging base material was opened and the tissue paper was taken out from the package and used. .. The evaluation criteria are as follows.
A: People who find it difficult to remove tissue paper 0 to 1 people B: People who find it difficult to remove tissue paper 2-3 people C: People who find it difficult to remove tissue paper 4 to 6 people D: People who find it difficult to remove tissue paper 7 to 20 people who find it difficult to take out

(Example 2) to (Example 12), (Comparative Example 1) to (Comparative Example 4)
In Examples 2 to 12 and Comparative Examples 1 to 4, a packaging base material having the physical properties shown in Table 1 was prepared in the same manner as in Example 1, and a packaging base material having the physical properties shown in Table 1 was prepared and used in the same manner as in Example 1 to form a tissue paper package. (Gazette packaging) was prepared and each tissue paper was evaluated for its resistance to collapse. However, in Example 10, instead of providing the polyethylene layer as the heat seal layer on the paper substrate, a styrene-acrylic adhesive layer (adhesive coating amount: 10.8 g / m ² ) was provided. Further, in Example 11, 26 sets of tissue paper 2 ply were put as paper products, and in Example 12, 72 sets of tissue paper 2 ply were put as paper products to prepare a tissue paper package.

As is clear from the results shown in Table 1, all the packages of Examples 1 to 12 were easy to take out the tissue paper and easy to use. On the other hand, in Comparative Examples 1 to 4, it was difficult to take out the tissue paper and it was difficult to use.
Therefore, the package of the present invention provides a package for paper products in which the contents of the packaged object are hard to collapse (easy to take out) even when the packaged object is a paper product, particularly a paper product such as tissue paper. be able to.

1 Package 10 Packaging base material 11 Paper products (objects to be packaged)
12 Mountain fold part 13 Seal part

Claims (8)

A packaging body having four substantially parallel mountain folds extending in one direction, covering the entire surface of one or more paper products, and sealing the paper products with a sealing portion.
Each of the mountain folds has a ruled line and has a ruled line.
The packaging substrate includes at least a paper substrate and a sealing layer.
The basis weight of the packaging base material is 35 g / m ² or more and 105 g / m ² or less.
The seal portions are provided at both ends of the mountain fold portion, each of which is formed in a substantially straight line orthogonal to the direction of the mountain fold portion, and each seal portion is formed substantially in parallel.
The distance between the mountain folds in the central portion of the mountain fold of the packaging base material in the direction orthogonal to the linear direction of the seal is defined as A.
When the length of the paper product in the direction orthogonal to both the linear direction of the seal portion and the linear direction of the mountain fold portion in the paper product is defined as B.
A package for paper products, wherein the ratio of B to A (B / A (%)) is 78% or more and 130% or less. The packaging body for paper products according to claim 1, wherein the bending stiffness of the packaging base material in the MD direction is 20 μN · m or more and 330 μN · m or less. The packaging body for paper products according to claim 1 or 2, wherein the bending stiffness of the packaging base material in the CD direction is 8 μN · m or more and 145 μN · m or less. The packaging body for paper products according to any one of claims 1 to 3, wherein the sealing layer is a heat sealing layer and / or an adhesive layer. The packaging body for paper products according to claim 4, wherein the heat-sealing layer contains a polyolefin-based resin. The packaging body for a paper product according to any one of claims 1 to 5, wherein the paper product is thin paper. The packaging body for a paper product according to claim 6, wherein the thin paper is a laminated thin paper. The packaging for paper products according to any one of claims 1 to 7, wherein the packaging is caramel packaging, gusset packaging, or pillow packaging.

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