JP2021172415A - Toilet roll package - Google Patents

Abstract

To provide a toilet roll package which has a good post-packaging shape and whose packaging base material is not easy to break, although the main body of the toilet roll packaging base material being paper-based.SOLUTION: A package wraps 2, 4, or 6 toilet rolls with a packaging base material containing at least paper base materials, the basis weight of the packaging base material is 30 g/m 2 or more and 105 g/m2 or less, and the burst strength is 65 kPa or more and 295 kPa or less, the toilet rolls are arranged in two or three rows perpendicular to the axial direction, and all rows are aligned so that both ends are aligned, and the roll density of the toilet roll is 0.1 g/cm 3 or more 0.33 g/cm3 or less, the slack in the circumference direction of the packaging base material in the state where toilet rolls are packaged is 4 mm or more and 38 mm or less, and the ratio (B/A) of the slack (B) in the circumference direction to the roll density (A) is 13 or more and 200 or less.SELECTED DRAWING: Figure 1

Description

The present invention relates to a toilet roll package suitable for packaging paper products, particularly toilet rolls.

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 a 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, due to the growing awareness of environmental issues in recent years, it is desired to reduce the use of plastics (synthetic resins). For example, copy paper is wrapped in a packaging base material mainly made of paper, but in the case of toilet paper, especially toilet rolls of roll-shaped products, the toilet rolls are soft and the shape is not stable. The material bends at unintended points and is inferior in shape after packaging. Further, since the paper is thicker and stiffer than the film, the paper is hard to bend at a predetermined position, and is also inferior in the form after packaging.

As shown in FIG. 4A, wrapping the toilet paper tightly makes it easier to wrap it, but after wrapping, the portion where the packaging base material 20 does not come into contact with the toilet roll 21 (slack portion 20s) tends to be stretched. The packaging base material 20 is easily torn when the package is held. Therefore, when the loosened portion 20s is loosened, the tearing is suppressed, but the peripheral length of the packaging base material 20 with respect to the toilet roll 21 becomes large (long), and the packaging base material 20 looks loose, so that the shape after packaging is inferior. In addition, when the packaging base material 20 is loosened, the packaging base material 20 bends at an unintended location, and the shape after packaging is inferior.

On the other hand, as shown in FIG. 4B, when the toilet paper is softly wrapped, the toilet roll 31 is easily crushed after packaging, and the slack portion 30s of the packaging base material 30 is easily slackened or slackened, resulting in tearing. Although it becomes difficult, it is inferior to the form after packaging as described above. Therefore, if the basis weight of the paper is lowered so that the packaging base material 30 is easily bent, the packaging base material 30 is likely to be torn.

As described above, if the product is inferior in shape after packaging or easily torn, the product may be subject to complaints or may not be sold at retail stores.
As described above, it has been difficult to wrap a toilet roll with a paper-based packaging base material by the conventional technology.

The present invention has been made in view of such circumstances, and an object of the present invention is that even if a toilet roll is wrapped with a paper-based packaging base material, the shape after packaging is good and the packaging base material is torn. The purpose is to provide difficult toilet roll packaging.

In view of the above problems, the inventors of the present invention have conducted diligent research. As a result, the basis weight of the packaging base material, the burst strength, the roll density of the toilet roll, and the slack in the circumference direction of the packaging base material in the packaged state are specified, and the ratio of the roll density to the slack in the circumference length direction is also specified. As a result, even if the toilet roll is wrapped with a paper-based packaging base material, it is possible to obtain a toilet roll package having a good shape after packaging and the packaging base material is not easily torn, and it has been found that the above problems can be solved. , The present invention has been completed.
Specifically, the present invention provides the following.

(1) The first aspect of the present invention is a packaging base material containing at least a paper base material, which is a package in which two, four, or six toilet rolls are packaged, and the basis weight of the packaging base material. Is 30 g / m ² or more and 105 g / m ² or less, the burst strength is 65 kPa or more and 295 kPa or less, and the toilet rolls are in two or three rows in a direction perpendicular to the axial direction, and both rows are both end faces. The roll density of the toilet roll is 0.1 g / cm ³ or more and 0.33 g / cm ³ or less, and the slack in the circumferential length direction of the packaging base material in the state where the toilet roll is packaged is A toilet roll package having a thickness of 4 mm or more and 38 mm or less and a ratio (B / A) of the slack (B) in the peripheral length direction to the roll density (A) of 13 or more and 200 or less. be.
(2) The second aspect of the present invention is the toilet roll package according to (1), wherein the bending stiffness of the packaging base material in the CD direction is 8 μN ・ m or more and 130 μN ・ m or less. It is a feature.
(3) A third aspect of the present invention is the toilet roll package according to (1) or (2), wherein the bending stiffness of the packaging base material in the MD direction is 18 μN ・ m or more and 300 μN ・ m or less. It is characterized by being.
(4) A fourth aspect of the present invention is the toilet roll package according to any one of (1) to (3), 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.
(5) A fifth aspect of the present invention is the toilet roll package according to any one of (1) to (4), wherein the package is a caramel package. ..

According to the present invention, even if the toilet roll is wrapped with a paper-based packaging base material, it is possible to provide a toilet roll package having a good shape after packaging and the packaging base material is not easily torn.

It is a perspective view which shows an example of the toilet roll package of this invention. It is a figure which shows the method of measuring the slack of the peripheral length of the toilet roll package of this invention. It is a perspective view which shows the example of the arrangement of the toilet roll which is packaged in the toilet roll package of this invention. It is a top view which shows an example of the conventional toilet roll package.

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. Toilet roll package FIG. 1 is a perspective view showing an example of the toilet roll package (hereinafter, also simply referred to as “packaging”) of the present invention. As shown in FIG. 1, the packaging body 1 of the present invention is a packaging base material 10 containing at least a paper base material, and two, four, or six (four in FIG. 1) toilet rolls 11 are packaged. There is. In the package 1, the packaging base material 10 may cover a part of the toilet roll 11 instead of the whole, and the toilet roll 11 may not be sealed (not shown).

Here, when the winding length of the toilet roll 11, which will be described later, becomes long and the weight of the roll also increases, when the packaging body 1 is grasped from both sides with one hand, acupressure is applied to the peripheral length direction P of the packaging base material 10, and the packaging base material 10 is used. 10 is easily torn from the slack portion 10s. On the other hand, if the packaging base material 10 is packaged too loosely, the loosened portion 10s of the packaging base material 10 will loosen, and the form after packaging is inferior. Therefore, by defining the degree of slack in the peripheral length direction P of the packaging base material 10, it is possible to obtain the packaging body 1 which has a good shape after packaging and the packaging base material 10 is hard to tear.

The slack in the peripheral length direction P of the packaging base material 10 is measured as shown in FIG.
First, the package 1 is placed so that the axial direction L of the toilet roll 11 is horizontal, and two rows adjacent to each other in the lateral direction (that is, perpendicular to the axial direction L) (4 in FIGS. 1 and 3 (c)). A first ruler S made of stainless steel having a mass of 64 g, a thickness of 1 mm, a width of 25 mm, and a scale length of 300 mm was passed over the toilet rolls 11 (pieces), and placed so that the plate surface was in contact with the packaging base material 10. 1 The surface (line) of the ruler S in contact with the packaging base material 10 is defined as the reference line SL.
Next, among the slack portions 10s of the packaging base material 10 packaged across the toilet rolls 11 in two rows (4 in FIGS. 1 and 3 (c)) adjacent to each other in the lateral direction, the toilet rolls 11 in each row A second ruler R made of stainless steel having a mass of 10 g, a thickness of 0.5 mm, a width of 15 mm, and a scale length of 150 mm is placed almost in the center of the space, and the thickness direction Rt of the second ruler R is on the end face of the toilet roll 11. When mounted so as to be parallel (that is, perpendicular to the axial direction L), the distance (sinking amount) D from the reference line SL to the tip of the second ruler R is measured.

The distance D is measured at 25% of h from both ends of the height h of the package 1 and at three central points (three measurement points m in FIG. 1). In addition, one package 1 is measured on the front and back sides. This is performed for the five packaging bodies 1, the values of the distances D at a total of 30 locations are averaged, and the slack in the peripheral length direction P of the packaging base material 10 is adopted.
As the first ruler S and the second ruler R, for example, "straightedge silver" manufactured by Shinwa Rules Co., Ltd. can be used.

The slack of the packaging base material 10 measured in this manner in the circumferential direction P is 4 mm or more and 38 mm or less, preferably 6 mm or more and 28 mm or less, and more preferably 8 mm or more and 20 mm or less. If the slack in the peripheral length direction P is less than 4 mm, the portion where the packaging base material 10 does not contact the toilet roll 11 (slack portion 10s) is likely to be stretched, and when the packaging body 1 is held, the packaging base material 10 is likely to be stretched. Is easy to tear. If the slack in the peripheral length direction P exceeds 38 mm, the peripheral length of the packaging base material 10 with respect to the toilet roll 11 becomes large (long), and the packaging base material 10 bends at an unintended part during packaging, and after packaging. Inferior in morphology.

Further, the package 1 may be provided with perforations for breaking the packaging base material 10 to facilitate opening (not shown). This perforation may be provided, for example, parallel to the axial direction L in the slack portion 10s, or may be provided parallel to the axial direction L in the waist circumference portion of the package 1 other than the slack portion 10s (not shown). .. Further, the perforations may be provided perpendicular to the axial direction L, for example, on the top surface portion or the bottom surface portion of the package 1, the toilet rolls 11 perpendicular to the axial direction L and arranged in two or three rows. It may be provided in the direction connecting the central portions of the respective shafts (not shown). Further, the perforations may be provided on the waist circumference portion of the package 1 in a direction perpendicular to the axial direction L and along the peripheral length direction P of the packaging base material 10 (not shown). The length of the perforation can be set freely.

2. Packaging Base Material The packaging base material 10 contains at least a paper base material, but may contain other layers. 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 30 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. When the basis weight of the packaging base material 10 is within the above range, the packaging base material 10 is hard to tear and easily bends at a predetermined position when packaging, so that a packaging body 1 having an excellent shape after packaging can be obtained. Can be done. The basis weight of the packaging base material can be measured according to JIS P 8124.

(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 30 to 100% by weight of coniferous kraft pulp and 0 to 70% by weight of broadleaf kraft pulp, and 50 to 100% by weight of coniferous kraft pulp and broadleaf tree. It is more preferably 0 to 50% by weight of kraft pulp, and even more preferably 70 to 100% by weight of coniferous kraft pulp and 0 to 30% by weight of broadleaf kraft pulp. By blending the pulp as described above, the packaging base material 10 is not easily torn, and the packaging material 1 is easily bent at a predetermined position during packaging, so that the packaging body 1 having an excellent post-packaging form can be obtained. 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 packaging base material 10 is not easily torn, and the packaging material 1 is easily bent at a predetermined position during packaging, so that the packaging body 1 having an excellent shape after packaging can be obtained.

The cooking method and 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 improver 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 the package 1 may be easily torn when wet with water and the function as the package 1 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 20 g / ^{m 2} or more 95 g / ^{m 2} or less, 25 g / ^{m 2} or more 80 g / ^{m 2} or less, 30 g / ^{m 2} It is more preferably 60 g / m ² or more. If the basis weight is ^{less than 20 g / m 2} , the packaging base material 10 is easily torn. When the basis weight ^{exceeds 95 g / m 2} , the packaging base material 10 is difficult to bend at a predetermined position during packaging, and the shape after packaging is inferior. When the basis weight of the paper base material is within the above range, the packaging base material 10 is not easily torn, and it is easy to bend at a predetermined position when packaging, so that the packaging body 1 having an excellent shape after packaging can be obtained. can.

The basis weight of the paper base material can be determined as follows, for example, when the packaging base material 10 includes a seal layer as another layer in addition to the paper base material and the seal layer is a heat seal layer. can.
First, a 0.1 M aqueous acetic acid 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. Next, 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) is preferably 51% or more and 100% or less, but 60% or more and 100%. It is more preferably 70% or more, and further preferably 70% or more and 95% or less. By setting the ratio of the basis weight of the paper base material to the basis weight of the packaging base material 10 within the above range, the packaging base material 10 can be easily bent at a predetermined position, and the shape after packaging is excellent and it is difficult to tear. ..

(2) Sealing layer In the packaging body 1 of the present invention, the packaging base material 10 may include a sealing layer as another layer in addition to the paper base material, but in that case, the sealing layer is a heat sealing layer and / or It is preferably 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, when the heat sealing layer is included, even if it is formed on the entire surface of the paper base material, a part of the surface, for example, the paper base materials are laminated. It may be formed only in the portion to be joined. 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. 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 25 g / m ² or less. More preferred. When the basis weight of the heat seal layer is within the above range, the packaging base material 10 is not easily torn, and it is easy to bend at a predetermined position when packaging, so that a packaging body 1 having an excellent shape after packaging can be obtained. can. In addition, when the package 1 is sealed with a heat seal, it becomes easier to seal.

Further, as described above, the packaging body 1 of the present invention may be provided with perforations for breaking the packaging base material 10 and facilitating opening. The perforations are required to be easy to open and difficult to tear, but the packaging body 1 that wraps the soft toilet roll 11 may be difficult to open or the perforations may be torn depending on how the force is applied when opening from the perforations. It may happen. The basis weight of the heat seal layer is preferably within the range of 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 package 1 from the perforation and difficulty of tearing.

The basis weight of the heat seal layer can be obtained, for example, as follows.
First, a 0.1 M aqueous acetic acid 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 Yakuhin Kogyo 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. Next, 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 packaging body 1 of the present invention, when the packaging base material 10 includes an adhesive layer as another layer in addition to the paper base material, it is formed on the paper base material or the paper base material. It may be formed on the entire surface of the heat seal layer, or may be formed only on a part of the surface, for example, 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-based adhesive, a two-component curable urethane-based adhesive, a polyester urethane-based adhesive, or a polyether. 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 package the toilet roll 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. Examples of the layer other than the seal layer and the adhesive layer include a water vapor barrier layer, an oxygen barrier layer, a printing layer, a printability improving layer, an overprint layer, and a light-shielding layer. These other layers can be provided, for example, on the front surface side or the back surface side of the paper base material, 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 packaging body 1 is packaged so as to wrap the toilet roll 11 from the production line direction (transportation direction; MD direction). In some cases, the toilet roll 11 is wrapped from the width direction (CD direction) orthogonal to the production line direction. When wrapping the toilet roll 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 8.3 kN / m or less, and 2.5 kN / m or more and 7.0 kN / m. It is more preferably m or less, and further preferably 3.0 kN / m or more and 6.0 kN / m or less. When wrapping the toilet roll 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 3.5 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 2.5 kN / m or less. By setting the tensile strength of the packaging base material 10 in the MD direction and the CD direction within the above ranges, the packaging base material 10 is less likely to be torn and easily bent at a predetermined position during packaging, so that the form after packaging can be obtained. An excellent package 1 can be obtained. The tensile strength of the packaging base material 10 can be measured according to JIS P 8113.

The burst strength of the packaging base material 10 is 65 kPa or more and 295 kPa or less, preferably 75 kPa or more and 260 kPa or less, and more preferably 100 kPa or more and 210 kPa or less. If the burst strength is less than 65 kPa, the loosened portion 10s of the packaging base material 10 is likely to be torn when the package is held, and if the burst strength exceeds 295 kPa, the packaging base material 10 is placed at a predetermined position when packaging. Hard to bend and inferior in form after packaging. By setting the burst strength of the packaging base material 10 within the above range, the packaging base material 10 is hard to tear and easily bends at a predetermined position when packaging, so that a packaging body 1 having an excellent shape after packaging can be obtained. be able to. The burst strength of the packaging base material 10 can be measured according to JIS P 8112.

When wrapping the toilet roll 11 from the MD direction, the bending stiffness of the packaging base material 10 in the MD direction is preferably 18 μN ・ m or more and 300 μN ・ m or less, and more preferably 30 μN ・ m or more and 200 μN ・ m or less. , 45 μN · m or more and 150 μN · m or less is more preferable. When wrapping the toilet roll 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 130 μN ・ m or less, and more preferably 13 μN ・ m or more and 100 μN ・ m or less. , 20 μN · m or more and 60 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 packaging base material 10 is hard to tear and easily bends at a predetermined position when packaging, and the shape after packaging is excellent. Package 1 can be obtained. In addition, the required flexibility and softness of the packaging base material 10 can be easily achieved. 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 35 μm or more and 135 μm or less, more preferably 40 μm or more and 120 μm or less, and further preferably 60 μm or more and 100 μm or less. By setting the thickness of the packaging base material 10 within the above range, the packaging base material is not easily torn, and it is easy to bend at a predetermined position when packaging, so that a packaging body 1 having an excellent shape after packaging can be obtained. Can be done. 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 0.55 g / cm 3} or more and 0.95 g / cm ³ or less, more preferably 0.60 g / cm ³ or more and 0.90 g / cm ³ or less, and 0. and more preferably .65g / 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 packaging base material 10 is hard to tear and easily bends at a predetermined position when packaging, so that a packaging body 1 having an excellent post-packaging form can be obtained. can. 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.

3. 3. Toilet roll FIG. 3 is a perspective view showing an example of arrangement of the toilet roll 11 packaged in the package 1 of the present invention. The packaging body 1 of the present invention wraps two, four, or six toilet rolls 11, and the toilet rolls 11 are arranged in two or three rows in a direction perpendicular to the axial direction thereof, and any row thereof. Although both ends are arranged so as to be aligned, the arrangement is preferably any of FIGS. 3 (b) to 3 (e), and the arrangement shown in FIGS. 3 (c) or 3 (d) is preferable. More preferably, the arrangement shown in FIG. 3C is even more preferable. As shown in FIG. 2, since the package 1 of the present invention defines the slack in the peripheral length direction P described above, the arrangement as shown in FIG. 3A is not included in the embodiment. ..

The number of plies of the toilet roll 11 is not particularly limited, but is preferably 1 ply or 2 plies, and more preferably 2 plies.
In the case of 2-ply, the winding length of the toilet roll 11 is preferably 25 m or more and 103 m or less, more preferably 40 m or more and 95 m or less, and further preferably 55 m or more and 85 m or less. In the case of 1 ply, it is preferably 50 m or more and 203 m or less, more preferably 80 m or more and 190 m or less, and further preferably 110 m or more and 170 m or less.
The winding diameter of the toilet roll 11 is preferably 105 mm or more and 140 mm or less, more preferably 110 mm or more and 133 mm or less, and further preferably 115 mm or more and 125 mm or less.
By setting the above range, it becomes easy to adjust to a predetermined roll density. Then, when the toilet roll 11 is packaged with the packaging base material 10, the packaging base material 10 is not easily torn, and the packaging base material 10 is easily bent at a predetermined position during packaging, so that the packaging body 1 having an excellent post-wrapping form can be obtained. can.

The outer diameter of the core (paper tube) of the toilet roll 11 is preferably 25 m or more and 55 m or less, more preferably 30 m or more and 50 m or less, and further preferably 35 m or more and 45 m or less.
The basis weight per ply of the toilet roll 11 ^{is preferably 12 g / m 2} or more and 19 g / m ² or less, and 13 g / m ² or more and 18 g / m ² or less in the case of 2 plies. More preferably, it is 14 g / m ² or more and 17 g / m ² or less. In the case of 1 ply, ^{it is preferably 13 g / m 2} or more and 22 g / m ² or less, more preferably 14 g / m ² or more and 21 g / m ² or less, and 15 g / m ² or more and 20 g / m ² or less. It is more preferable to have.
Further, the weight per roll width of 114 mm in one roll excluding the core of the toilet roll 11 is preferably 100 g or more and 370 g or less, more preferably 130 g or more and 340 g or less, and 200 g or more and 300 g or less. Is more preferable.
By setting the above range, it becomes easy to adjust to a predetermined roll density. Then, when the toilet roll 11 is packaged with the packaging base material 10, the packaging base material 10 is not easily torn, and the packaging base material 10 is easily bent at a predetermined position during packaging, so that the packaging body 1 having an excellent post-wrapping form can be obtained. can.

Further, the roll density of the toilet rolls 11, 0.1 g / cm ³ or more 0.33 g / cm ³ or less, is preferably not more than 0.12 g / cm ³ or more 0.31 g / cm ^3, 0.18 g It is more preferably / cm ³ or more and 0.27 g / cm ^{3 or less.} If the roll density is ^{less than 0.1 g / cm 3} , the toilet roll 11 is soft and the shape is not stable, so that the packaging base material 10 bends at an unintended part when packaging, and the form after packaging is inferior. When the roll density ^{exceeds 0.33 g / cm 3} , the portion where the packaging base material 10 does not come into contact with the toilet roll 11 is likely to be stretched, and the packaging base material 10 is likely to be torn when the packaging body 1 is held. By setting the roll density of the toilet roll 11 within the above range, the packaging base material 10 is not easily torn, and it is easy to bend at a predetermined position when packaging, so that a packaging body 1 having an excellent shape after packaging can be obtained. Can be done.
The roll density is obtained by multiplying the bottom area of one toilet roll 11 excluding the core by the roll width (height) (that is, the volume of one toilet roll 11 excluding the core), and excludes the core. It is obtained by dividing the mass of one toilet roll 11 by this volume.
For example, when the roll weight (excluding the core) per roll width of 114 mm is 201 g, the winding diameter is 130 mm, and the outer diameter of the core is 39 mm, the roll density = 201 g ÷ [{3.14 × (130 mm ÷ 2 ÷ 10) ² − 3.14 × (39 mm ÷ 2 ÷ 10) ² } × (114 mm ÷ 10)] = 0.15 g / cm ³ .

Further, the ratio (B / A) of the slack (B) in the peripheral length direction P to the roll density (A) is preferably 13 or more and 200 or less, preferably 25 or more and 155 or less, and 40 or more and 100 or less. Is more preferable. When the ratio (B / A) is less than 13, the portion where the packaging base material 10 does not come into contact with the toilet roll 11 is likely to be stretched, and the packaging base material 10 is likely to be torn when the packaging body 1 is held. When the ratio (B / A) exceeds 200, the peripheral length of the packaging base material 10 with respect to the toilet roll 11 becomes large (long), and the packaging base material 10 bends at an unintended part when packaging, and after packaging. Inferior in morphology.

The thickness of 10 sheets of toilet paper used for the toilet roll 11 (10 sheets for 1 ply, 10 sheets for 5 sets in the case of 2 plies) is 0.5 mm / 10 sheets or more and 1.2 mm / 10 sheets. The number of sheets is preferably 0.6 mm / 10 sheets or more and 1.1 mm / 10 sheets or less, and 0.7 mm / 10 sheets or more and 1.0 mm / 10 sheets or less.
The paper thickness is measured using a thickness gauge (dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measuring load of 3.7 kPa, a stylus diameter of 30 mm, a sample is placed between the stylus and the measuring table, and the gauge when the stylus is lowered at a speed of 1 mm or less per second is read. Further, the measurement is repeated 10 times and the measurement results are averaged.

Further, the longitudinal tensile strength (DMDT) at the time of drying per 2 plies is preferably 2.5 N / 25 mm or more and 6.5 N / 25 mm or less, and 2.8 N / 25 mm or more and 6.0 N / 25 mm or less. Is more preferable, and 3.1 N / 25 mm or more and 5.5 N / 25 mm or less is further preferable. Further, the lateral tensile strength (DCDT) at the time of drying per 2 plies is preferably 0.6 N / 25 mm or more and 3.0 N / 25 mm or less, and 0.8 N / 25 mm or more and 2.5 N / 25 mm or less. Is more preferable, and 1.0 N / 25 mm or more and 2.0 N / 25 mm or less is further preferable.
The tensile strengths in the vertical direction and the horizontal direction during drying can be measured and calculated in accordance with JIS P 8113.
Further, the roll density, paper thickness and tensile strength are measured after being held in an equilibrium state under the temperature and humidity conditions (23 ± 1 ° C., 50 ± 2% RH) specified in JIS P 8111.

4. Packaging format As the packaging format of the packaging body 1 according to the present invention, caramel packaging can be exemplified.

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 parallel to or intersecting this direction, or a shaft of the packaging base material formed in advance into a tubular shape. Insert the object to be packaged from one end in the direction. 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. Is sealed with an adhesive such as glue, or if it is a packaging base material having a heat seal layer or an adhesive layer, it is sealed with a heat seal. This caramel packaging can be done using known equipment. Although flaps are formed at both ends in the direction parallel to the axis of the toilet roll 11 in FIG. 1, flaps may be formed at both ends in the direction perpendicular to the axial direction L of the toilet roll 11.

In a certain embodiment, for example, when the packaging base material 10 having a bending stiffness in the MD direction of 18 μN ・ m or more and 300 μN ・ m or less is used, the packaging body of the present invention is 1, for example, the packaging base material 10 in the form of a continuous sheet. After arranging the toilet roll 11, the toilet roll 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. When the wrapping direction is the MD direction, the wrapping base material 10 is easily bent in the vertical direction, and when the flaps are folded and bonded at the top surface portion and the bottom surface portion, the wrapping is easy. In this case, in the packaging body 1 of the present invention, it is preferable to select caramel packaging as the packaging format. The toilet roll 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 toilet roll 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 130 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 toilet roll 11, when packaging the toilet roll 11 while wrapping it 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. When the wrapping direction is the CD direction of the packaging base material, the packaging base material 10 is easily bent in the wrapping direction, and the packaging is easy. In this case as well, the toilet roll 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 toilet roll 11 is arranged. 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 Yakuhin Kogyo 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 closed tightly. Next, 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.

(Rupture strength of packaging base material)
The burst strength of the packaging substrate was measured according to JIS P 8112. The measurement was performed under the measurement conditions for low pressure using a Murren burst degree tester manufactured by Kumagai Riki Kogyo Co., Ltd.

(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 should not include perforations, but may include perforations when it is necessary to include perforations 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. Each basis weight of the prepared packaging base material, paper base material and heat seal layer, ratio of paper base material, thickness and density of packaging base material, tensile strength in MD direction and CD direction, bending stiffness in MD direction and CD direction , And the results of measuring the burst strength are shown in Tables 1 and 2.

(Toilet roll)
In addition, four toilet rolls, which are the winding length, winding diameter, number of plies, core outer diameter, basis weight per ply, weight per roll width 114 mm, and roll density shown in Tables 1 and 2, were prepared.

(Toilet roll packaging (caramel packaging))
Using the prepared packaging base material, a package was prepared from 430 cm in the MD direction of the packaging base material × 655 cm in the CD direction of the packaging base material. Then, four toilet rolls (two in length and two in width) were put in this package and sealed with caramel packaging to obtain a toilet roll package. In addition, the form was adopted in which the toilet roll was wrapped and wrapped from the CD direction.
Then, in the toilet roll package, the slack in the peripheral length direction P of the packaging base material was measured, and the ratio (B / A) of the slack (B) in the peripheral length direction P to the roll density (A) was calculated.

(Difficulty of tearing of packaging base material)
With respect to the prepared toilet roll package, 30 monitors evaluated the difficulty of tearing the packaging base material when the package was grasped from both sides with one hand. The evaluation criteria are as follows.
5: People who felt that the packaging base material was easy to tear 0 to 1 person 4: People who felt that the packaging base material was easy to tear 2-3 people 3: People who felt that the packaging base material was easy to tear 4 to 6 people 2: People who felt that the packaging base material was easy to tear 7 to 20 people 1: People who felt that the packaging base material was easy to tear 21 to 30 people

(Good form after packaging (cosmeticity))
The prepared toilet roll package was evaluated by 30 monitors for its good morphology (cosmeticity) when the appearance of the package was visually observed. The evaluation criteria are as follows.
5: People who feel that the packaging base material is loose or not bent at the specified position and feels inferior in cosmetics 0 to 1 person 4: The packaging base material is loose or not bent at the specified position. 2 to 3 people who felt inferior in cosmetics 3: People who felt inferior in cosmetics because the packaging base material was loose or did not bend in place 4 to 6 people 2: Packaging base People who felt that the material was loose or did not bend in the specified position and felt inferior in cosmetics 7 to 20 people 1: The packaging base material loosened or did not bend in the specified position, and the cosmetics 21 to 30 people who felt that the packaging base material was inferior to the others. Each was evaluated from the two viewpoints of quantity.

(Example 2) to (Example 24), (Comparative Example 1) to (Comparative Example 8)
In Examples 2 to 24 and Comparative Examples 1 to 8, packaging base materials having the physical characteristics shown in Tables 1 and 2 were prepared in the same manner as in Example 1, and using this, a toilet roll was used in the same manner as in Example 1. A package (caramel package) was prepared, and the resistance to tearing of the packaging base material and the morphology after packaging were evaluated. However, in Example 23, a paper base material having neither an adhesive layer nor a heat seal layer was used. In Example 24, instead of providing the polyethylene layer as the heat seal layer on the paper substrate, a styrene-acrylic adhesive layer (adhesive coating amount 17.5 g / m ² ) is provided, and the basis weight of the adhesive layer is increased. Was measured. Further, in each Example and each Comparative Example, the size of the packaging base material was appropriately adjusted.

As is clear from the results shown in Tables 1 and 2, the packaging bodies of Examples 1 to 24 were all excellent in the form after packaging because the packaging base material was not easily torn. On the other hand, in all of Comparative Examples 1 to 8, the packaging base material was easily torn or the form after packaging was inferior.
Therefore, the packaging body of the present invention can provide a toilet roll packaging body which has a good shape after packaging and the packaging base material is not easily torn even if the toilet roll is wrapped with a packaging base material mainly made of paper.

1 Package 10, 20, 30 Packaging base material 10s, 20s, 30s Loose part 11, 21, 31 Toilet roll L Axial direction of toilet roll P Perimeter direction of packaging base material S 1st ruler SL reference line R 2nd ruler Rt 2nd ruler thickness direction D Subduction amount of packaging base material

Claims (5)

A packaging base material containing at least a paper base material, which is a packaging body in which two, four, or six toilet rolls are packaged.
The basis weight of the packaging base material is 30 g / m ² or more and 105 g / m ² or less, and the burst strength is 65 kPa or more and 295 kPa or less.
The toilet rolls are arranged in two or three rows in a direction perpendicular to the axial direction, and both rows are arranged so that both end faces are aligned.
The roll density of the toilet roll is 0.1 g / cm ³ or more and 0.33 g / cm ³ or less.
The slack in the peripheral length direction of the packaging base material in the state where the toilet roll is packaged is 4 mm or more and 38 mm or less.
A toilet roll package, wherein the ratio (B / A) of the slack (B) in the peripheral length direction to the roll density (A) is 13 or more and 200 or less. The toilet roll package according to claim 1, wherein the bending stiffness of the packaging base material in the CD direction is 8 μN · m or more and 130 μN · m or less. The toilet roll package according to claim 1 or 2, wherein the bending stiffness of the packaging base material in the MD direction is 18 μN · m or more and 300 μN · m or less. The toilet according to any one of claims 1 to 3, 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. Roll packaging. The toilet roll package according to any one of claims 1 to 4, wherein the package is a caramel package.

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