JP2021070486A - Package - Google Patents

Abstract

To provide a new package which is suitable particularly when a soft product such as a paper product is to be packaged.SOLUTION: A package 1 for packaging one or more packaged articles 1b includes a packaging base material 1a containing at least paper base material, and the package 1 is characterized in that bending rigidity of the packaging base material 1a in a CD direction is 8 μN m or more and 145 μN m or less.SELECTED DRAWING: Figure 1

Description

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

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.

However, there has been a demand for a new package in which a soft product such as a paper product as described above is used as an object 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. When soft products such as, etc. were used as the objects to be packaged, they were difficult to achieve.

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

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a new packaging body which is particularly suitable for soft products such as paper products as objects to be packaged. To do.

In view of the above problems, the inventors of the present invention have conducted diligent research. As a result, when a paper product, for example, a soft product such as tissue paper is used as the object to be packaged and a paper-based material is selected as the packaging base material, even if the paper-based packaging base material is originally difficult to wrap the soft product. By setting the bending stiffness of the packaging base material in the CD direction within a specific numerical range, it has become possible to package soft products in a practically good manner, and it has been found that the above problems can be solved, and the present invention has been completed. It was. Specifically, the present invention provides the following.

(1) The first aspect of the present invention is a packaging body for packaging one or more objects to be packaged, which comprises a packaging substrate including at least a paper substrate, and the packaging substrate has a bending stiffness in the CD direction. The package is characterized by having a size of 8 μN · m or more and 145 μN · m or less.
(2) The second aspect of the present invention is the package according to (1), wherein the ratio of the basis weight of the paper base material to the basis weight of the packaging base material is 51% or more and 100% or less. It is characterized by that.
(3) The third aspect of the present invention is the package according to (1) or (2), wherein the basis weight of the packaging base material is 30 g / m ² or more and 105 g / m ² or less. It is characterized by.
(4) A fourth aspect of the present invention is the package according to any one of (1) to (3), wherein the packaging base material further includes a heat seal layer. is there.
(5) A fifth aspect of the present invention is the package according to (4), characterized in that the heat-sealing layer contains a polyolefin-based resin.
(6) The sixth aspect of the present invention is the package according to (4) or (5), wherein the basis weight of the paper base material is 25 g / m ² or more and 85 g / m ² or less. The heat-sealing layer is characterized in that the basis weight is 5 g / m ² or more and 50 g / m ² or less.
(7) A seventh aspect of the present invention is the package according to any one of (1) to (6), wherein the packaging base material further includes an adhesive layer. is there.
(8) The eighth aspect of the present invention is the package according to any one of (1) to (7), wherein the paper base material has a coniferous kraft pulp ratio of 50% by weight or more and 100% by weight or more. It is characterized in that it is produced using the following pulp.
(9) A ninth aspect of the present invention is the package according to any one of (1) to (8), wherein the packaged object is thin paper.
(10) A tenth aspect of the present invention is the package according to (9), wherein the thin paper is a laminated or roll-shaped thin paper.
(11) The eleventh aspect of the present invention is the package according to any one of (1) to (10), characterized in that the package is a gusset package or a pillow package. Is.

According to the present invention, it is possible to provide a novel package that is particularly suitable for a soft product such as a paper product as an object to be packaged.

FIG. 1 is a schematic plan view showing an example of the manufacturing process of the package of the present invention. FIG. 2 is a schematic plan view showing another example of the manufacturing process of the package of the present 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 Body The packaging body of the present invention is a packaging body that wraps one or more objects to be packaged, and includes a packaging base material including at least a paper base material.

The package of the present invention preferably includes an outlet for taking out the object to be packaged. Further, 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 so that the cut line can be cut and opened at the time of use.

2. Packaging base material (1) Paper base material The packaging base material has at least a paper base material. When the paper base material is formed as a package, the outer surface side may be printed. Further, the paper base material may be overcoated paper that has been overcoated to ensure waterproofness.

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 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 hardwood kraft pulp, 70 to 100% by weight of hardwood kraft pulp, and hardwood kraft. It is more preferably 0 to 30% by weight of the pulp, and further preferably 90 to 100% by weight of the coniferous kraft pulp and 0 to 100% by weight of the hardwood kraft pulp. Further, it is preferably unbleached pulp. By setting the proportion of softwood kraft pulp to 50% by weight or more and 100% by weight or less, it becomes easy to adjust the bending stiffness of the packaging base material to the required range.

A material other than pulp fiber may be blended in the pulp slurry as an auxiliary material. In this package, the content ratio of pulp fibers 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.

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 can be difficult to reuse the body 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 the package may be easily torn when wet with water and the function as a package may be inferior.

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

The basis weight of the paper base material of the packaging base material ^{is preferably 25 g / m 2} or more and 85 g / m ² or less, more preferably 32 g / m ² or more and 70 g / m ² or less, and 40 g / m ² or more. It is more preferably 55 g / m ^{2 or less.} When the basis weight of the paper base material is within the above range, 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.
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 acetic acid 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 (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 of the packaging base material (0.5 g) 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 x [(mass of packaging base material-mass of heat seal layer) / mass of packaging base material]

(2) Heat Sealing Layer In the packaging body of the present invention, it is usually preferable that the packaging base material includes a heat sealing layer. The heat seal layer may be formed on the entire surface of the paper base material, or may be formed only on a part of the surface surface, for example, a portion where the paper base materials are laminated and bonded to each other. 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, it is more preferably 5 g / ^{m 2} or more 50 g / ^{m 2} or less, 5 g / ^{m 2} or more 35 g / ^{m 2} or less More preferably, it is 10 g / m ² or more and 20 g / m ² or less. When the basis weight of the heat-sealing layer is within the above range, the required bending stiffness of the packaging base material in the CD direction can be achieved, and the sealing performance and heat-sealing strength of the packaging material tend to be easily secured. There is.

Further, as described above, the package of the present invention preferably includes an outlet for taking out the object to be packaged, and the outlet is formed with a cut line such as a perforation, and the cut line is cut out to allow opening. Is preferable. The take-out port is required to be easy to open and difficult to tear, but when opening the take-out port, the package that wraps the soft object may be difficult to open or the take-out port may be torn. It may be chilly. By setting the basis weight of the heat seal layer to 3 g / m ² or more and 50 g / m ² or less, preferably 5 g / m ² or more and 35 g / m ² or less, and more preferably 10 g / m ² or more and 20 g / m ² or less. It is also possible to achieve both ease of opening when opening the take-out port and resistance to 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 acetic acid 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 (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 (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 x (mass of heat seal layer / mass of packaging base material)

(3) Adhesive Layer In the packaging body of the present invention, the packaging base material may be provided with an adhesive layer in place of the heat seal layer or in addition to the heat seal layer. The packaging base material of the present invention has a layer structure such as, for example, a paper base material / adhesive layer, a paper base material / heat seal layer / adhesive layer, a paper base material / adhesive layer / heat seal layer, and the like. Can be done. Even if the adhesive layer is formed on the entire surface of the paper base material or the heat seal layer formed on the paper base material, only a part of the surface, for example, a part where the paper base materials are laminated and bonded to each other. It may be formed. 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, ethylene-based adhesives such as ethylene-vinyl acetate copolymer and ethylene-ethyl acrylate copolymer that can be used as hot melt adhesives are 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.

As described above, in the packaging base material of the present invention, an adhesive layer may be provided instead of the heat seal layer, but usually, a heat containing a heat seal layer, particularly a polyolefin resin, rather than the adhesive layer. The seal layer has better adhesiveness, and providing a heat seal layer, particularly a heat seal layer containing a polyolefin resin, may make it easier to wrap the object to be packaged.

(4) Other Layers The packaging base material of the present invention may include other layers in addition to the paper base material, the heat seal layer and / or the adhesive 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 heat seal layer or the adhesive layer, or on the uppermost surface of the packaging base material, and may be one layer or two or more layers.

(5) Physical characteristics, shape, etc. of the entire packaging base material In the package of the present invention, the bending stiffness of the packaging base material in the CD direction is 8 μN · m or more and 145 μN · m or less. There has been no conventional packaging body using such a paper base material and a packaging base material having bending stiffness in a specific CD direction, and by using this specific packaging base material, a required packaging base material is used. All of the suppleness, softness, and strength can be achieved, and as a result, soft products (objects to be packaged) such as paper products can be packaged in a practically good manner.
For example, when packaging the tissue paper laminate, 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 and 0.25 g / cm. ³ or less is more preferable, and 0.10 g / cm ³ or more and 0.20 g / cm ³ or less is further preferable. In this range, when the tissue paper laminate is packaged using the packaging base material of the present application, it becomes easy to wrap. The density of the tissue paper laminate is measured as follows. First, the tissue paper laminate is collected from the package, 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) 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))

The bending stiffness of the packaging base material in the CD direction is more preferably 13 μN ・ m or more and 100 μN ・ m or less, and further preferably 20 μN ・ m or more and 58 μN ・ m or less. The bending stiffness of the packaging substrate 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, the bending stiffness in the CD direction tends to increase when the fiber orientation ratio is close to 1.0.

The thickness of the packaging substrate 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 70 μm or more and 90 μm or less. The thickness of the packaging substrate 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 ^{is preferably 0.6 g / cm 3} or more and 0.95 g / cm ³ or less, more preferably 0.65 g / cm ³ or more and 0.9 g / cm ³ or less, and 0. It is more preferably 7 g / cm ³ or more and 0.85 g / cm ^{3 or less.} When the density of the packaging base material is within the above range, the required strength, suppleness and softness of the packaging base material can be easily achieved, and the air permeability can be easily maintained. The density of the packaging base material can be measured and calculated in accordance with JIS P 8118: 1998.

Further, when packaging a soft object to be packaged, the length / height ratio of the package base material in the shape of the object to be packaged in the direction along the CD direction is preferably 0.5 or more and 5 or less, more preferably 1. By setting the range to 4 or more, more preferably 1.5 or more and 3 or less, it may be easier to better wrap the object to be packaged.

The ratio of the basis weight of the paper base material to the basis weight of the packaging base material (for example, the total basis weight of the paper base material and the heat seal layer and / or the adhesive layer) may be 51% or more and 100% or less. Usually, it is more preferably 60% or more and 95% or less, and further preferably 70% or more and 90% or less. Within the above range, the ease of packaging for a soft object to be packaged can be ensured, and good heat sealability or adhesiveness can also be ensured.

The basis weight of the packaging base material (for example, the total basis weight of the paper base material and the heat seal layer and / or the adhesive layer) is ^{preferably 30 g / m 2} or more and 105 g / m ² or less, preferably 37 g / m ^2. It is more preferably 90 g / m ² or more, and further preferably 50 g / m ² or more and 75 g / m ² or less. When the basis weight of the packaging base material is within the above range, it becomes easy to achieve all of the required flexibility, softness, and strength of the packaging base material. In addition, it becomes easy to adjust the bending stiffness of the packaging base material within the above range.

Here, as described above, in the packaging body of the present invention, for example, the packaging base material may have a heat seal layer and / or an adhesive layer formed only on a part of the surface of the paper base material, and has a layer structure. Does not have to be the same over the entire surface of the packaging substrate. In that case, each physical property value of the packaging base material, the basis weight of the paper base material, the basis weight of the heat seal layer, etc. take the average value of the whole.

3. 3. Items to be Packaged The package of the present invention can be suitably applied to wrap paper products, particularly soft products such as tissue paper. Examples of the thin paper include, but are not limited to, roll-shaped tissue paper such as toilet paper and kitchen paper, and laminated tissue paper such as tissue paper, wiper, wet tissue, and paper hand towel. Among these, the package of the present invention can be particularly preferably applied when packaging laminated thin paper.

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

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.
The pillow packaging includes vertical pillow packaging in which the packaging base material is sent in the vertical direction and the object to be packed is filled from above, and horizontal pillow packaging in which the packaging base material is sent in the horizontal direction 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 parts are formed into a cylindrical shape by heat-sealing, etc., and the bottom part or mouth part is woven according to the length (height) of the bag and sealed in a single horizontal character with heat-sealing, etc. At the same time, it is a packaging type in which each bag is cut at this sealed portion. This gusset packaging can be done using known equipment.

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 body. Then, of the packaging base materials protruding from both ends of the packaged body, 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. The caramel wrapping is preferably about 2 to 9, preferably about 2 to 6, and more preferably 4 rolls of tissue paper or laminated tissue paper. This caramel packaging can be done using known equipment.

FIG. 1 is a schematic plan view showing an example of the manufacturing process of the package 1 of the present invention. As shown in FIG. 1, first, the packaging base material 1a is conveyed in the form of a continuous sheet from the upstream in the conveying direction. When the object to be packaged 1b is arranged on the packaging base material 1a and passes through the position of the folding device 10, the packaging base material 1a is moved by the device 10 in the width direction (CD direction) orthogonal to the transport direction (MD direction). ) Is folded. Next, when passing through the position of the sealing / cutting device 20, both end portions on which the packaging base material 1a is superposed are sealed with a heat seal or the like along the transport direction (MD direction), and the direction of the production line is increased. The packaging base materials 1a are superposed along the orthogonal width direction (CD direction), and the portion on which the packaging base materials 1a are superposed is sealed with a heat seal or the like and cut to form the packaging body 1. To do. Sealing and cutting may be performed at the same time or separately. Further, the object to be packaged 1b may be arranged under the packaging base material 1a, and may be packaged in that state, that is, in a state in which the vertical direction is opposite to that in FIG. Further, before the object to be packaged 1b is placed on the package base material 1a, the package base material 1a is cut to a predetermined size, and then the object to be packaged is placed, wrapped, and sealed with a heat seal or the like. May be good. The above-mentioned gusset packaging and pillow packaging correspond to a form of wrapping an object to be packaged from this CD direction. As for the above-mentioned caramel packaging, a form of wrapping the object to be packaged from this CD direction can be adopted.

FIG. 2 is a schematic plan view showing another example of the manufacturing process of the package 1 of the present invention. As shown in FIG. 2, first, the packaging base material 1a is conveyed in the form of a continuous sheet from the upstream in the conveying direction. When the object to be packaged 1b is arranged on the packaging substrate 1a and passes through the position of the folding / sealing / cutting device 30, the device 30 covers the top and bottom of the object to be packaged 1b with the packaging substrate 1a. The tip of the packaging base material 1a in the transport direction (MD direction) is returned beyond the object to be packaged 1b, overlapped with the packaging base material 1a, and folded. Next, both ends on which the packaging base materials 1a are overlapped are sealed with a heat seal or the like along the width direction (CD direction) orthogonal to the production line direction, and the packaging is performed along the transport direction (MD direction). The portion on which the base material 1a is overlapped is sealed with a heat seal or the like, and is cut to form the package 1. Sealing and cutting may be performed at the same time or separately. For example, after the object to be packaged 1b is placed on the packaging substrate 1a, the packaging substrate 1a is cut to a predetermined size and covered. It is also possible to wrap the packaged object 1b with the packaging base material 1a and seal it with a heat seal or the like. Further, before the object to be packaged 1b is arranged on the packaging substrate 1a, the packaging substrate 1a is cut to a predetermined size, and then the object to be packaged is arranged, wrapped, and sealed with a heat seal or the like. You may. For the above caramel packaging, a form of wrapping the object to be packaged from this MD direction can be adopted.

The packaging body of the present invention uses a packaging base material having bending stiffness in a specific CD direction. For example, the packaging base material is transported in the form of a continuous sheet, the object to be packaged is arranged, and then the transport direction (production line). It is particularly preferably applied when the packaged object is wrapped and wrapped from the width direction (CD direction) orthogonal to the direction (MD direction), that is, when the wrapping direction is the CD direction of the packaging base material. The packaged base material may be cut to a predetermined size and then the packaged object may be placed, or the packaged base material may be cut to a predetermined size after the packaged material is placed.

In the package of the present invention, it is preferable to select gusset packaging or pillow packaging as the packaging type, and gusset packaging is more preferable.

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 (total basis weight of the paper base material, the heat seal layer and / or the adhesive layer) was measured in accordance with 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 acetic acid 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)

(Basis weight of adhesive layer (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 using a standard model TM-600 (manufactured by Kumagai Riki Kogyo Co., Ltd.), which is an automatic elevating paper thickness gauge, in accordance with JIS P 8118: 1998. 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.

(Measurement of bending stiffness of the packaging base material in the CD direction)
The bending stiffness of the packaging base material in the CD direction was measured 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. Table 1 shows the results of measuring the basis weight of the prepared packaging base material, the basis weight of the paper base material, the basis weight of the heat seal layer, the thickness and density of the packaging base material, and the bending stiffness in the CD direction.

(Tissue paper 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 2 ply were put into this package as an object to be packaged and sealed by gusset packaging to obtain a tissue paper package. In addition, the form was adopted in which the object to be packaged was wrapped from the CD direction.

(Evaluation of ease of packaging)
The ease of packaging (productivity) of this package when producing a tissue paper package was evaluated. The evaluation criteria are as follows. The evaluation criteria A to C of the following evaluation items were set as preferable levels, and D and E were set as unacceptable levels.
A: It was very easy to wrap and the productivity was very good.
B: Easy to wrap and excellent in productivity.
C: There was a slight decrease in productivity, but it was not noticeable.
D: Productivity has dropped significantly.
E: Productivity was difficult to apply to actual operations.
The evaluation results are shown in Table 1.

(Example 2) to (Example 10) and (Comparative Example 1) to (Comparative Example 3)
In the same manner as in Example 1, a packaging base material having the physical properties shown in Table 1 was prepared, and using this, a tissue paper package was prepared in the same manner as in Example 1, and the ease of packaging (production). Gender) was evaluated. However, in Example 2, instead of providing the polyethylene layer as the heat seal layer on the paper substrate, a styrene acrylic adhesive layer (adhesive coating amount: 10 g / m ² ) was provided.

As is clear from the results shown in Table 1, the packaging bodies of Examples 1 to 10 in which the bending stiffness of the packaging base material in the CD direction is 8 μN ・ m or more and 145 μN ・ m or less are for soft objects to be packaged (tissue paper). It was easy to wrap.

1 Packaged body 1a Packaging base material 1b Packaged object 10 Folding device 20 Sealing and cutting device 30 Folding and sealing and cutting device

Claims (11)

A packaging body that wraps one or more objects to be packaged.
With a packaging substrate that includes at least a paper substrate,
A package having a bending stiffness of the packaging base material in the CD direction of 8 μN ・ m or more and 145 μN ・ m or less. The package according to claim 1, wherein the ratio of the basis weight of the paper base material to the basis weight of the packaging base material is 51% or more and 100% or less. The package according to claim 1 or 2, wherein the packaging base material has a basis weight of 30 g / m ² or more and 105 g / m ^{2 or less.} The package according to any one of claims 1 to 3, wherein the packaging base material further includes a heat-sealing layer. The package according to claim 4, wherein the heat-sealing layer contains a polyolefin-based resin. The basis weight of the paper base material is 25 g / m ² or more and 85 g / m ² or less.
The package according to claim 4 or 5, wherein the heat seal layer has a basis weight of 5 g / m ² or more and 50 g / m ^{2 or less.} The package according to any one of claims 1 to 6, wherein the packaging base material further includes an adhesive layer. The invention according to any one of claims 1 to 7, wherein the paper base material is produced using pulp having a softwood kraft pulp ratio of 50% by weight or more and 100% by weight or less. Packaging body. The package according to any one of claims 1 to 8, wherein the packaged object is thin paper. The package according to claim 9, wherein the thin paper is a laminated or roll-shaped thin paper. The package according to any one of claims 1 to 10, wherein the package is a gusset package or a pillow package.

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