Toilet roll package

Abstract

To provide a toilet roll package in which: a toilet roll is packed with a packaging base material including at least a paper base material; the form thereof after packaging is favorable even with a hot melt adhesive adheres thereto; defectives of toilet roll are hardly generated; and the packaging base material is caused to adhered properly, and easy to peel off.SOLUTION: Disclosed is a toilet roll package in which two, four or six toilet rolls are packed with a packaging base material including at least a paper base material. A basis weight of the packaging base material is 40 g / m2 or more but 105 g / m2 or less. The toilet rolls are arranged in one, two or three rows so that both edge faces of all rows are aligned in order in the case of two or three rows. A hot melt adhesive is applied in a direction nearly perpendicular to a peripheral length direction of the packaging base material. The toilet roll package comprises an adhesion part adhering to the other end of the peripheral length direction of the packaging base material.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a toilet roll package suitable for packaging paper products, particularly toilet rolls. [Background technology]

[0002] In recent years, there has been a demand for volume reduction of plastics, particularly base materials used for packaging, containers, etc.

[0003] For example, copy paper is packaged in a packaging base made primarily of paper, while toilet paper (toilet roll) is soft (its shape is not stable), so the packaging base can bend in unintended places during packaging, resulting in poor shape after packaging. Also, because paper is thicker and stiffer than film, it is difficult for the paper to bend in the desired places, which also results in poor shape after packaging.

[0004] For example, Patent Document 1, an example of a prior art document related to an invention relating to a toilet roll package, discloses a method for manufacturing a toilet roll package in which a predetermined number of toilet roll packs are assembled together and wrapped in a paper sheet in a caramel-like shape, using a paper sheet made mainly from kraft pulp, and providing in advance an easy-to-tear line such as a perforation and / or opening means such as tear tape in the center of the longitudinal direction of the sheet (the direction in which the paper flows during manufacturing), and wrapping the assembly of roll packs in a caramel-like shape with a paper sheet cut to a predetermined size, and then bonding the front and rear overlapping edges of the paper sheet on the top of the caramel-like wrapper, and further sealing the side overlapping edges of the caramel-like wrapper with recyclable adhesive tape. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-054504 Summary of the Invention [Problem to be solved by the invention]

[0006] When a toilet roll is packaged using heat seal paper that has an adhesive layer (heat seal layer) all over it and heat sealed in the circumferential direction, normally, as shown in Figure 4(a), after packaging, the packaging base materials 20 are bonded together via adhesive section 22, and the toilet roll 21 remains intact, but in some cases (depending on how heat is transferred), the inner packaging base material 30 and toilet roll 31 may be bonded via adhesive section 32, as shown in Figure 4(b), resulting in a defective product.

[0007] Therefore, it has been considered to use a hot melt adhesive to bond the packaging base material so as not to perform heat sealing. When a hot melt adhesive is used, the adhesive area where the hot melt adhesive is applied rises, and when the toilet roll packages are packaged in cardboard, the toilet roll packages are compressed together, causing the adhesive area to be pressed against the surface of the toilet roll of another toilet roll package, leaving a mark and resulting in a defective product.

[0008] On the other hand, if the basis weight of the packaging substrate is increased to prevent the adhesive area from leaving marks on the toilet roll, and the adhesive area is not locally compressed by other toilet roll packages, marks are less likely to be left, but the packaging substrate becomes harder, making it difficult to bend in the specified places, resulting in an inferior shape after packaging.

[0009] Furthermore, if the amount of hot melt adhesive is reduced, it is less likely to leave marks, but the adhesive strength of the packaging substrate is reduced, which may cause partial removal of the packaging and result in a defective product. Also, if the area of ​​the adhesive is increased, it is more likely to leave marks and it may become difficult to peel off the packaging substrate, resulting in a defective product. Therefore, when packaging toilet rolls with a packaging base material containing a paper base material, it has been difficult to reduce the occurrence of defective products and achieve good packaging properties.

[0010] The present invention has been made in view of these circumstances, and its object is to provide a toilet roll package in which a toilet roll is packaged in a packaging base material that includes at least a paper base material, and even when bonded with a hot melt adhesive, the shape after packaging is good, there are few defective toilet rolls, and the packaging base material is appropriately bonded so that it is easy to peel off. [Means for solving the problem]

[0011] The inventors of the present invention conducted extensive research in light of the above-mentioned problems, and as a result, they discovered that by specifying the basis weight of the packaging substrate, and further applying a hot melt adhesive to one end of the packaging substrate in a direction approximately perpendicular to the circumferential direction of the packaging substrate, and providing an adhesive part that bonds to the other end of the packaging substrate in the circumferential direction, it is possible to package a toilet roll in a packaging substrate that includes at least a paper substrate, and even when bonded with a hot melt adhesive, it is possible to obtain a toilet roll package that has a good shape after packaging, is less likely to produce defective toilet rolls, and has an appropriately bonded packaging substrate that is easy to peel, thereby solving the above-mentioned problems, and have completed the present invention. Specifically, the present invention provides the following:

[0012] (1) A first aspect of the present invention is a package in which two, four, or six toilet rolls are packaged in a packaging substrate containing at least a paper substrate, and the basis weight of the packaging substrate is 40 g / m 2 More than 105g / m 2 The toilet roll package is characterized in that the toilet rolls are arranged in one, two or three rows in a direction perpendicular to the axial direction, and when there are two or three rows, both end faces of each row are aligned, and a hot melt adhesive is applied to one end of the packaging base material in a direction approximately perpendicular to the circumferential direction of the packaging base material, and an adhesive part is provided that is bonded to the other end of the packaging base material in the circumferential direction. (2) A second aspect of the present invention is the toilet roll packaging according to (1), characterized in that the adhesive portion has a spiral shape. (3) A third aspect of the present invention is the toilet roll packaging according to (2), characterized in that the width of the adhesive portion is 3 mm or more and 40 mm or less. (4) A fourth aspect of the present invention is the toilet roll packaging according to (2) or (3), characterized in that the hot melt adhesive is made of a rubber-based material. (5) A fifth aspect of the present invention is the toilet roll packaging according to (1), characterized in that the adhesive portion has a bead shape. (6) A sixth aspect of the present invention is the toilet roll packaging according to (5), characterized in that the width of the adhesive portion is 1 mm or more and 20 mm or less. (7) A seventh aspect of the present invention is the toilet roll packaging according to (5) or (6), characterized in that the hot melt adhesive is made of an olefin-based material. (8) The eighth aspect of the present invention is the toilet roll packaging according to any one of (1) to (7), wherein the roll density of the toilet roll is 0.10 g / cm 3 More than 0.33g / cm 3 It is characterized by the following: (9) A ninth aspect of the present invention is the toilet roll packaging according to any one of (1) to (8), characterized in that the packaging is a caramel packaging. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a toilet roll package in which a toilet roll is packaged in a packaging base material that includes at least a paper base material and is bonded with a hot melt adhesive, the shape after packaging is good, there are few defective toilet rolls, and the packaging base material is moderately bonded so that it is easy to peel off. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view showing an example of a toilet roll packaging according to an embodiment of the present invention. FIG. [Figure 2]FIG. 10 is a perspective view showing an example of a toilet roll packaging according to another embodiment of the present invention. [Figure 3] FIG. 2 is a perspective view showing an example of the arrangement of toilet rolls packaged in the toilet roll package of the present invention. [Figure 4] 1A and 1B are plan views showing an example of a conventional toilet roll packaging and an example of a defective product. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, the form for carrying out the present invention (hereinafter referred to as the embodiment) will be described in detail with reference to the drawings. However, these are presented for the purpose of illustration only and are not intended to limit the present invention.

[0016] 1. Toilet roll packaging Figure 1 is a perspective view showing an example of a toilet roll packaging body (hereinafter simply referred to as "package") of the present invention. As shown in Figure 1, the packaging body 1 of the present invention packages two, four, or six (four in Figure 1) toilet rolls 11 in a packaging base material 10 containing at least a paper base material. The packaging form of the toilet roll 11 will be described later. In the package 1, the packaging base 10 may cover only a part of the toilet roll 11 rather than the entirety, and the toilet roll 11 may not be sealed (not shown).

[0017] Furthermore, the packaging body 1 has an adhesive part 12 formed by applying a hot melt adhesive to one end of the packaging substrate 10 in the circumferential direction P in a direction approximately perpendicular to the circumferential direction P of the packaging substrate 10 (the axial direction L of the toilet roll 11), and adhering the adhesive part 12 to the other end of the packaging substrate 10 in the circumferential direction P. By forming the adhesive part 12 in a direction approximately perpendicular to the circumferential direction P of the packaging substrate 10 (the axial direction L of the toilet roll 11), the packaging body 1 can be made to have a good shape after packaging, be less likely to produce defective toilet rolls 11, and have the packaging substrate 10 properly adhered so that it is easy to peel off. In this case, the one end (other end) in the circumferential direction P of the packaging substrate 10 where the adhesive portion 12 is provided does not have to be the end of the packaging substrate 10, and the adhesive portion 12 may be provided a few centimeters from the end toward the center of the packaging substrate 10.

[0018] Here, the shape of the adhesive portion 12 is preferably a spiral shape as shown in Figure 1. The spiral shape ensures a good shape after packaging, reduces the production of defective toilet rolls 11, and allows the packaging substrate 10 to be properly adhered and easily peeled off, resulting in a package 1. There are no particular restrictions on the material of the hot melt adhesive used to form the adhesive portion 12, and known adhesives such as ethylene vinyl acetate, rubber, polyamide, olefin, and polyurethane can be used. Of these, rubber or olefin adhesives are preferred, with rubber being more preferred. Furthermore, the width SP of the adhesive portion 12 (the length in a direction approximately parallel to the circumferential direction P of the packaging substrate 10) is preferably 3 mm or more and 40 mm or less, more preferably 6 mm or more and 33 mm or less, and even more preferably 10 mm or more and 25 mm or less. If the width SP is less than 3 mm, the adhesive strength of the hot melt adhesive will be too weak, and the packaging substrate 10 may peel off unintentionally. If the width SP exceeds 40 mm, the adhesive strength of the hot melt adhesive will be too strong, making it difficult to peel off the packaging paper.

[0019] The adhesive portion 12 may have a bead shape (single line shape), as in the adhesive portion 12 in a package 1 according to another embodiment shown in FIG. 2 . When the adhesive portion 12 has a bead shape, the width BP of the adhesive portion 12 (the length in a direction substantially parallel to the circumferential direction P of the packaging substrate 10) is preferably 1 mm or more and 20 mm or less, more preferably 2 mm or more and 15 mm or less, and even more preferably 3 mm or more and 10 mm or less. If the width BP is less than 1 mm, the adhesive strength of the hot melt adhesive may be too weak, resulting in unintended peeling of the packaging substrate 10. If the width BP exceeds 20 mm, the adhesive strength of the hot melt adhesive may be too strong, making it difficult to peel the packaging paper. When the adhesive portion 12 has a bead shape, the material of the hot melt adhesive used to form the adhesive portion 12 is not particularly limited, and known adhesives such as ethylene vinyl acetate, rubber, polyamide, olefin, and polyurethane may be used. Among these, rubber-based or olefin-based adhesives are preferred, and olefin-based adhesives are more preferred.

[0020] The packaging body 1 may also have perforations (not shown) to make it easier to tear and open the packaging base material 10. For example, these perforations may be provided parallel to the axial direction L (the height direction h of the packaging body 1) in a portion of the packaging base material 10 that does not contact the toilet roll 11, or may be provided parallel to the axial direction L in a side portion of the packaging body 1 other than this portion (not shown). The perforations may also be provided perpendicular to the axial direction L, for example, on the top or bottom surface of the packaging body 1, perpendicular to the axial direction L and in a direction connecting the centers of the axes of the toilet rolls 11 arranged in two or three rows (not shown). Furthermore, perforations may be provided on the side portion of the packaging body 1, perpendicular to the axial direction L and along the circumferential direction P of the packaging base material 10 (not shown). The length of the perforations can be freely set.

[0021] 2.Packaging base material The packaging substrate 10 includes at least a paper substrate, but may also include other layers; for example, PE-laminated paper may be used for waterproofing. Furthermore, the paper substrate may be printed on the outer surface when formed into the packaging body 1. It is preferable that the packaging substrate 10 is mainly made of paper except for the portion bonded with the hot melt adhesive, and more preferably is made of 100% paper.

[0022] The basis weight of the packaging substrate 10 is 40 g / m 2 More than 105g / m 2 less than 50 g / m 2 More than 90g / m 2 Preferably, it is 60 g / m or less. 2 More than 80g / m 2 It is more preferable that the basis weight is 40 g / m or less. 2 If the basis weight is less than 105 g / m, the adhesive portion 12 is likely to leave a mark on the toilet roll 11. 2 If the basis weight exceeds this range, the packaging substrate 10 will be difficult to bend at the specified position during packaging, resulting in a poor shape after packaging. By keeping the basis weight of the packaging substrate 10 within the above range, it is possible to obtain a package 1 that has a good shape after packaging, is less likely to produce defective toilet rolls 11, and is easily peeled off because the packaging substrate 10 is properly adhered. The basis weight of the packaging substrate 10 can be measured in accordance with JIS P 8124, excluding the adhesive portion 12 to which the hot melt adhesive is applied.

[0023] (1)Paper base material The paper base material is produced using wood pulp as the main raw material. Examples of pulp that can be used include softwood kraft pulp, hardwood kraft pulp, groundwood pulp, thermomechanical pulp, chemithermomechanical pulp, and recycled paper pulp such as that used in newspapers, flyers, plain magazines, coated magazines, thermal recording paper, pressure-sensitive recording paper, construction paper, colored wood-free paper, copy paper, computer output paper, and mixtures of these recycled paper. Any of these conventionally known pulps can be used alone or in any mixture ratio. Kraft paper is preferred.

[0024] The pulp used in the paper base material of the packaging body 1 of the present invention is preferably 30% to 100% by weight of softwood kraft pulp and 0% to 70% by weight of hardwood kraft pulp, more preferably 50% to 100% by weight of softwood kraft pulp and 0% to 50% by weight of hardwood kraft pulp, and even more preferably 70% to 100% by weight of softwood kraft pulp and 0% to 30% by weight of hardwood kraft pulp. Using the above pulp blends results in a packaging body 1 that has a good shape after packaging, is less likely to produce defective toilet rolls 11, and is appropriately bonded to the packaging base material 10 for easy peeling. Unbleached pulp is also preferred.

[0025] The pulp slurry may contain materials other than pulp fiber as secondary materials. In the packaging body 1, the pulp fiber content is typically 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 even more preferably 90% by weight or more and 100% by weight or less. By setting the pulp content within the above range, it is possible to obtain a packaging body 1 that has a good shape after packaging, is less likely to produce defective toilet rolls 11, and has a packaging substrate 10 that is properly adhered and easy to peel off.

[0026] The cooking method and bleaching method in the pulp production are not particularly limited.

[0027] In addition, various commonly used additives, such as wet strength agents, fillers, sizing agents, dry strength agents, retention aids, coloring pigments, etc., may be added to the paper base material as needed in appropriate amounts.

[0028] The wet strength improver can be selected from among commonly used and well-known agents. For example, it is preferable to select from polyamide-polyamine resins, polyacrylamide resins, melamine resins, etc. The amount of such wet strength improver (mass in the bone-dry state) is usually 0.01 to 0.7% by weight, preferably 0.02 to 0.5% by weight, and more preferably 0.03 to 0.3% by weight, based on the mass of the pulp (mass in the bone-dry state). If the amount of wet strength improver exceeds 0.7% by weight, it becomes difficult to obtain the effect commensurate with the amount, resulting in increased costs and reduced disintegration properties, which may make it difficult to reuse the packaging body 1 of the present invention. Furthermore, if the amount of wet strength improver is less than 0.01% by weight, it becomes difficult to obtain sufficient wet strength, the packaging body 1 may be prone to tearing when wet, and the packaging body 1 may function poorly.

[0029] In the packaging body 1 of the present invention, the paper base material of the packaging substrate 10 can be obtained by making paper from these raw materials using a normal papermaking process.

[0030] (2) Other layers The packaging substrate 10 of the present invention may have other layers in addition to the paper substrate. Examples of such other layers include a heat seal layer, a water vapor barrier layer, an oxygen barrier layer, a print layer, a printability improving layer, an overprint layer, and a light-shielding layer. These other layers may be provided, for example, on the front or back side of the paper substrate, and may consist of one layer or two or more layers.

[0031] (3) Physical properties of the entire packaging substrate As will be described later, there are various packaging formats for the packaging body 1 according to the present invention, including packaging that wraps the toilet roll 11 from the direction of the production line (conveyance direction; MD) and packaging that wraps the toilet roll 11 from the width direction (CD) perpendicular to the production line direction. When wrapping the toilet roll 11 from the MD, the tensile strength of the packaging substrate 10 in the MD is preferably 2.5 kN / m to 7.5 kN / m, more preferably 3.3 kN / m to 6.5 kN / m, and even more preferably 4.0 kN / m to 5.8 kN / m. If the tensile strength in the MD is less than 2.5 kN / m, the adhesive 12 will likely leave a mark on the toilet roll 11. If the tensile strength in the MD exceeds 7.5 kN / m, the packaging substrate 10 will have difficulty bending at the specified position during packaging, resulting in a poor shape after packaging.

[0032] When wrapping the toilet roll 11 from the CD direction, the tensile strength of the packaging substrate 10 in the CD direction is preferably 1.5 kN / m to 5.0 kN / m, more preferably 2.0 kN / m to 4.2 kN / m, and even more preferably 2.5 kN / m to 3.8 kN / m. If the tensile strength in the CD direction is less than 1.5 kN / m, the adhesive 12 will likely leave a mark on the toilet roll 11. If the tensile strength in the CD direction exceeds 5.0 kN / m, the packaging substrate 10 will have difficulty bending at the specified positions during packaging, resulting in a poor shape after packaging. By setting the tensile strength of the packaging substrate 10 in the MD and CD directions within the above ranges, it is possible to obtain a package 1 that has a good shape after packaging, is less likely to produce defective toilet rolls 11, and is easily peeled because the packaging substrate 10 is properly adhered. The tensile strength of the packaging substrate 10 can be measured in accordance with JIS P 8113, excluding the adhesive portion 12 where the hot melt adhesive is applied.

[0033] The bursting strength of the packaging substrate 10 is preferably 120 kPa or more and 430 kPa or less, more preferably 150 kPa or more and 370 kPa or less, and even more preferably 200 kPa or more and 310 kPa or less. If the bursting strength is less than 120 kPa, the adhesive portion 12 will be more likely to leave a mark on the toilet roll 11. If the bursting strength is more than 430 kPa, the packaging substrate 10 will be less likely to bend at the specified position during packaging, resulting in a poor shape after packaging. By keeping the bursting strength of the packaging substrate 10 within the above range, it is possible to obtain a package 1 that has a good shape after packaging, is less likely to produce defective toilet rolls 11, and has a packaging substrate 10 that is properly adhered and easy to peel. The burst strength of the packaging substrate 10 can be measured in accordance with JIS P 8112, excluding the adhesive portion 12 to which the hot melt adhesive is applied.

[0034] When wrapping the toilet roll 11 from the MD, the bending stiffness of the packaging substrate 10 in the MD is preferably 60 μN·m to 900 μN·m, more preferably 100 μN·m to 700 μN·m, and even more preferably 200 μN·m to 550 μN·m. If the bending stiffness in the MD is less than 60 μN·m, the adhesive 12 will likely leave marks on the toilet roll 11. If the bending stiffness in the MD exceeds 900 μN·m, the packaging substrate 10 will have difficulty bending at the specified positions during packaging, resulting in a poor shape after packaging.

[0035] When wrapping the toilet roll 11 from the CD direction, the bending stiffness of the packaging substrate 10 in the CD direction is preferably 30 μN·m to 400 μN·m, more preferably 40 μN·m to 300 μN·m, and even more preferably 70 μN·m to 240 μN·m. If the bending stiffness in the CD direction is less than 30 μN·m, the adhesive portion 12 will likely leave a mark on the toilet roll 11. If the bending stiffness in the CD direction exceeds 400 μN·m, the packaging substrate 10 will have difficulty bending at the specified positions during packaging, resulting in a poor shape after packaging. By ensuring that the bending stiffness of the packaging substrate 10 in the MD or CD direction is within the above range, it is possible to obtain a package 1 that has a good shape after packaging, is less likely to produce defective toilet rolls 11, and has the packaging substrate 10 properly adhered so that it is easy to peel off. It also becomes easier to achieve the required flexibility and softness of the packaging substrate 10. The bending stiffness of the packaging substrate 10 can be measured in accordance with ISO 2493, excluding the adhesive portion 12 where the hot melt adhesive is applied. Note that bending stiffness is strongest when a load is applied in the longitudinal direction of the fibers, so when the fiber orientation ratio is close to 1.0, bending stiffness in the MD direction tends to be small and bending stiffness in the CD direction tends to be large.

[0036] The thickness of the packaging substrate 10 of the present invention is preferably 50 μm or more and 160 μm or less, more preferably 70 μm or more and 140 μm or less, and even more preferably 90 μm or more and 120 μm or less. If the thickness is less than 50 μm, the adhesive portion 12 is likely to leave a mark on the toilet roll 11. If the thickness exceeds 160 μm, the packaging substrate 10 is difficult to bend at the specified position during packaging, resulting in a poor shape after packaging. By keeping the thickness of the packaging substrate 10 within the above range, it is possible to obtain a package 1 that has a good shape after packaging, is less likely to produce defective toilet rolls 11, and has a packaging substrate 10 that is properly adhered and easy to peel off. The thickness of the packaging substrate 10 can be measured in accordance with JIS P 8118: 1998. The pressure condition on the pressing surface is 100 kPa.

[0037] The density of the packaging substrate 10 is 0.50 g / cm 3 More than 0.85g / cm 3 Preferably, it is 0.55 g / cm or less. 3 More than 0.80g / cm 3 More preferably, it is 0.60 g / cm or less. 3 More than 0.75g / cm 3 It is more preferable that the density is 0.50 g / cm or less. 3If the thickness is less than 0.85 g / cm 3 , the packaging substrate 10 becomes too thick, making it difficult for the packaging substrate 10 to bend at a predetermined position, resulting in poor shape after packaging. 3 If the thickness exceeds this, the packaging substrate 10 becomes too thin, making it difficult for the packaging substrate 10 to bend at a predetermined position, and also making it easy for the adhesive portion 12 to leave a mark on the toilet roll 11. By having the density of the packaging substrate 10 within the above range, it is possible to obtain a package 1 in which the shape after packaging is good, the toilet roll 11 is less likely to be defective, and the packaging substrate 10 is appropriately adhered so that it is easy to peel off. It is also easy to achieve the required strength, flexibility, and softness of the packaging substrate 10. The density of the packaging substrate 10 can be measured and calculated in accordance with JIS P 8118:1998, excluding the portion adhered with the hot melt adhesive described below.

[0038] 3. Toilet roll 3 is a perspective view showing an example of the arrangement of toilet rolls 11 packaged in the package 1 of the present invention. The package 1 of the present invention packages two, four, or six toilet rolls 11. If the number of rolls exceeds six, the package 1 becomes heavy and the packaging base material 10 becomes more likely to tear.

[0039] Furthermore, the toilet rolls 11 are arranged in one, two, or three rows perpendicular to the axial direction L, and in the two or three rows, both end faces of each row are aligned. The arrangement is preferably one of those shown in Figures 3(a) to 3(e), more preferably the arrangement shown in Figure 3(c) or 3(d), and even more preferably the arrangement shown in Figure 3(c). If the number of roll rows (the number of rolls in the horizontal direction) exceeds three, the size of the package 1 increases, making it difficult for the packaging substrate 10 to bend at the specified position during packaging, resulting in a poor shape after packaging. If the number of stacked rolls (the number of rolls in the vertical direction) exceeds three, the size of the package 1 increases, making it difficult for the packaging substrate 10 to bend at the specified position during packaging, resulting in a poor shape after packaging. The both end faces of each row may be misaligned by several millimeters due to variations in the roll width of each toilet roll 11.

[0040] The number of plies of the toilet roll 11 is not particularly limited, but is preferably one or two plies, and more preferably two plies. The roll length of the toilet roll 11 is preferably 35 m or more and 103 m or less, more preferably 40 m or more and 95 m or less, and even more preferably 55 m or more and 85 m or less, in the case of a two-ply toilet roll 11. In the case of a single-ply toilet roll 11, it is preferably 80 m or more and 203 m or less, more preferably 100 m or more and 185 m or less, and even more preferably 120 m or more and 173 m or less. If the roll length is less than 35 m in the case of a two-ply toilet roll, or less than 80 m in the case of a single-ply toilet roll, the roll density will be low and the shape after packaging will be poor when a constant roll diameter and roll length is achieved. If the roll length exceeds 103 m in the case of a two-ply toilet roll, or exceeds 203 m in the case of a single-ply toilet roll, the roll density will be high when a constant roll diameter and roll length is achieved, and the adhesive part 12 will easily leave a mark on the toilet roll 11 (the toilet roll 11 will be tightly wound, and the mark will be difficult to remove).

[0041] Furthermore, the roll diameter of the toilet roll 11 is preferably 105 mm or more and 140 mm or less, more preferably 110 mm or more and 127 mm or less, and even more preferably 115 mm or more and 122 mm or less. If the roll diameter is less than 105 mm, the roll density will be high when the roll length and basis weight are kept constant, and marks from the adhesive part 12 will be more likely to be left on the toilet roll 11 (the toilet roll 11 will be tightly wound, and the marks will be difficult to remove). If the roll diameter exceeds 140 mm, the roll density will be low when the roll length and basis weight are kept constant, and the shape after packaging will be inferior. By setting the winding length and winding diameter of the toilet roll 11 within the above ranges, it becomes easier to adjust the roll density to the desired level. Furthermore, when the toilet roll 11 is wrapped in the packaging substrate 10, the packaging substrate 10 is less likely to tear and is more likely to bend at predetermined positions during wrapping, resulting in a package 1 with an excellent shape after wrapping.

[0042] The outer diameter of the core (paper tube) of the toilet roll 11 is preferably 25 mm or more and 55 mm or less, more preferably 30 mm or more and 50 mm or less, and even more preferably 35 mm or more and 45 mm or less. If the outer diameter of the core is less than 25 mm, the roll density will be low and the shape will be poor after packaging when a constant winding diameter, winding length, and basis weight is achieved. If the outer diameter of the core is more than 55 mm, the roll density will be high and the adhesive part 12 will easily leave marks on the toilet roll 11 when a constant winding diameter, winding length, and basis weight is achieved (the toilet roll 11 will be tightly wound, and the marks will be difficult to remove).

[0043] The basis weight per ply of the toilet roll 11 is 12 g / m in the case of two plies. 2 More than 18g / m 2 Preferably, it is 13 g / m or less. 2 More than 17g / m 2 More preferably, it is 14 g / m or less. 2 More than 16g / m 2 It is more preferable that the thickness is 13 g / m or less in the case of one ply. 2 More than 22g / m 2 Preferably, it is 14 g / m or less. 2 More than 20g / m 2 More preferably, it is 15 g / m or less. 2 More than 18g / m 2 It is more preferable that the thickness is 12 g / m or less in the case of two plies. 2 or less than 13 g / m for one ply 2 If the density is less than 18 g / m, the roll density will be low and the shape after packaging will be poor when wound to a certain diameter and length. 2 or 22 g / m for one ply 2 If the roll diameter and length exceed this value, the roll density will increase and the adhesive portion 12 will be more likely to leave marks on the toilet roll 11 when the roll diameter and length are kept constant (because the toilet roll 11 is tightly wound, the marks will be difficult to remove).

[0044] Furthermore, the weight per 114 mm of roll width of one roll of toilet roll 11 excluding the core is preferably 120 g to 370 g, more preferably 135 g to 330 g, and even more preferably 190 g to 305 g. If the weight is less than 120 g, the roll density will be low when wound to a constant diameter, resulting in poor shape after packaging. If the weight exceeds 370 g, the roll density will be high when wound to a constant diameter, and marks from the adhesive parts 12 will be more likely to be left on the toilet roll 11 (the toilet roll 11 will be tightly wound, making the marks less likely to disappear). By setting the outer diameter, basis weight, and weight of the core of the toilet roll 11 within the above ranges, it is easy to adjust the roll density to a predetermined value. Furthermore, when the toilet roll 11 is packaged in the packaging substrate 10, the packaging substrate 10 is less likely to tear and is more likely to bend at predetermined positions during packaging, resulting in a package 1 with excellent shape after packaging.

[0045] The roll density of the toilet roll 11 is 0.10 g / cm 3 More than 0.33g / cm 3 less than or equal to 0.12 g / cm 3 More than 0.31g / cm 3 Preferably, it is 0.18 g / cm or less. 3 More than 0.27g / cm 3 It is more preferable that the roll density is 0.10 g / cm or less. 3 If the roll density is less than 0.33 g / cm, the shape after packaging will be poor. 3 If the density exceeds this range, the adhesive 12 will leave marks on the toilet roll 11 (the toilet roll 11 will be tightly wound, and the marks will be difficult to remove). By keeping the roll density of the toilet roll 11 within the above range, the packaging substrate 10 will be less likely to tear and will be easier to bend at specified positions during packaging, resulting in a package 1 with excellent shape after packaging.

[0046] The roll density is calculated by multiplying the base area of ​​one toilet roll 11 excluding the core by the roll width (height) (i.e., the volume of one toilet roll 11 excluding the core), and then dividing the mass of one toilet roll 11 excluding the core by this volume. For example, if the roll weight (excluding the core) per 114 mm of roll width is 201 g, the winding diameter is 130 mm, and the outer diameter of the core is 39 mm, then the roll density = 201 g ÷ [{3.14 × (130 mm ÷ 2 ÷ 10) 2 -3.14×(39mm÷2÷10) 2}×(114mm÷10)]=0.15g / cm 3 This becomes: At this time, the roll density is measured after being kept in an equilibrium state under the temperature and humidity conditions specified in JIS P 8111 (23±1° C., 50±2% RH).

[0047] The thickness of 10 sheets of toilet paper (10 sheets for one ply, 10 sheets for five sets for two ply) used in the toilet roll 11 is preferably 0.4 mm / 10 sheets or more and 1.2 mm / 10 sheets or less, more preferably 0.5 mm / 10 sheets or more and 1.1 mm / 10 sheets or less, and even more preferably 0.6 mm / 10 sheets or more and 0.9 mm / 10 sheets or less. Paper thickness is measured using a thickness gauge (a dial thickness gauge called "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 3.7 kPa and a probe diameter of 30 mm. The sample is placed between the probe and the measuring table, and the gauge is read when the probe is lowered at a speed of 1 mm per second or less. The measurement is repeated 10 times and the results are averaged.

[0048] 4.Packaging format The preferred packaging format for the packaging body 1 according to the present invention is caramel packaging.

[0049] Caramel packaging involves wrapping the product in a packaging substrate extending in one direction of the product in a direction parallel to or intersecting this direction, or inserting the product into one axial end of a pre-formed cylindrical packaging substrate, forming the adhesive joint 12 described above. Then, of the packaging substrate extending beyond both ends of the product, two opposing flap-shaped edges are folded toward each other, and then two other opposing flap-shaped edges are similarly folded toward each other, and these folded portions are sealed with an adhesive such as glue. This caramel packaging can be performed using known equipment. While FIG. 1 shows flaps formed on both ends parallel to the axis of the toilet roll 11, flaps may also be formed on both ends perpendicular to the axial direction L of the toilet roll 11. The adhesive used is preferably a hot melt adhesive, as with the adhesive joint 12.

[0050] In one embodiment, for example, when using a packaging substrate 10 having a bending stiffness in the MD direction of 60 μN·m or more and 900 μN·m or less, the packaging body 1 of the present invention is particularly suitable for cases in which, for example, the packaging substrate 10 is transported in the form of a continuous sheet, the toilet roll 11 is placed, the toilet roll 11 is wrapped and packaged in the transport direction (production line direction; MD), and the toilet roll 11 is cut to a predetermined size in the width direction (CD direction) perpendicular to the transport direction, i.e., when the wrapping direction (the circumferential direction P of the packaging substrate 10) is the MD direction of the packaging substrate 10. When the wrapping direction is the MD direction, the packaging substrate 10 is more likely to bend appropriately in the width direction (CD direction), making packaging easier when folding and adhering the flaps at the top and bottom surfaces. In this case, it is preferable to select caramel packaging as the packaging format for the packaging body 1 of the present invention. The toilet roll 11 may be placed after the packaging substrate 10 is cut to a predetermined size, or the toilet roll 11 may be placed after the packaging substrate 10 is cut to a predetermined size.

[0051] In another embodiment, when using a packaging substrate 10 having a bending stiffness in the CD direction of 30 μN·m or more and 400 μN·m or less, the packaging body 1 of the present invention is particularly suitable for use when, for example, the packaging substrate 10 is transported in the form of a continuous sheet, a toilet roll 11 is placed, and the toilet roll 11 is then wrapped and packaged in the width direction (CD direction) perpendicular to the transport direction (manufacturing line direction; MD direction), i.e., when the wrapping direction is the CD direction of the packaging substrate 10. When the wrapping direction is the CD direction of the packaging substrate 10, the packaging substrate 10 is more likely to bend in the wrapping direction, making packaging easier. Note that, in this case, the toilet roll 11 may be placed after the packaging substrate 10 is cut to a predetermined size, or the toilet roll 11 may be placed and then the packaging substrate 10 may be cut to a predetermined size.

[0052] Although the present invention has been described above using embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above embodiments. Furthermore, it is clear from the claims that such modifications and improvements can also be included within the technical scope of the present invention. [Example]

[0053] The present invention will be described in detail below with reference to examples, but the present invention is not limited to the examples shown below.

[0054] In the examples and comparative examples, the physical properties of the packaging substrates prepared were measured by the following methods.

[0055] (Basis weight of packaging substrate) The basis weight of the packaging substrate was measured in accordance with JIS P 8124.

[0056] (Thickness of packaging substrate) The thickness of the packaging substrate 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 on the pressing surface was 100 kPa.

[0057] (Density of packaging substrate) The density of the packaging substrate was measured and calculated in accordance with JIS P 8118:1998.

[0058] (tensile strength in MD and CD directions of packaging substrate) The tensile strength of the packaging substrate in the MD and CD directions was measured in accordance with JIS P 8113.

[0059] (Measurement of bending stiffness in MD and CD directions of packaging substrate) The bending stiffness of the packaging substrate in the MD and CD directions was measured using an L&W bending tester (manufactured by Lorentzen & Wettre) in accordance with the method described in ISO 2493. For the packaging substrate, a test piece 38 mm wide and 100 mm long was used, and the bending resistance (load) was measured when the bending angle was 15 degrees and the bending length (span of the sample stage) was 10 mm. The bending stiffness (μN·m) was calculated using the following formula. Bending stiffness (μN·m) = 60 × bending resistance (mN) × bending length 10 (mm) 2 ÷(π × bending angle 15 (°) × sample width 38 (mm)) If it is not possible to obtain a 100 mm long test specimen, the length of the test specimen may be shortened. The test specimen should not include perforations, but if perforations are necessary to ensure the size of the test specimen, they may be included.

[0060] (Burst strength of packaging substrate) The burst strength of the packaging substrate was measured in accordance with JIS P 8112. The measurement was carried out using a Mullen burst strength tester manufactured by Kumagai Riki Kogyo Co., Ltd. under low pressure measurement conditions.

[0061] Example 1 (Packaging base material) A paper substrate (kraft paper) made from 100% unbleached softwood kraft pulp (NUKP) was prepared as the pulp raw material and used as the packaging substrate. The basis weight, thickness, density, tensile strength in the MD and CD directions, burst strength, and bending stiffness in the MD and CD directions of the packaging substrate were measured, and the results are shown in Table 1.

[0062] (Toilet roll) Four toilet rolls were prepared having the winding length, winding diameter, number of plies, core outer diameter, basis weight per ply, weight per 114 mm of roll width, and roll density shown in Table 1.

[0063] (Toilet roll packaging (caramel packaging)) Using the prepared packaging substrate, a package was made with dimensions of 650 mm in the MD direction of the packaging substrate and 420 mm in the CD direction of the packaging substrate. Four toilet rolls (2 vertically and 2 horizontally) were placed inside this package, and a rubber-based hot melt adhesive was applied to form a spiral-shaped adhesive joint. The package was then sealed with caramel packaging to obtain a toilet roll package. The toilet roll was wrapped and packaged from the MD direction. The adhesive joint was 18 mm wide.

[0064] (Packaged appearance (cosmetic properties)) The toilet roll packaging thus produced was visually inspected and evaluated by 30 monitors for appearance (beauty). The evaluation criteria were as follows: 5: 0 to 1 people felt that the packaging base material was loose or not bent in the specified position, and that the cosmetic appearance was poor, but the cosmetic appearance was remarkably good. 4: Two to three people felt that the packaging base was loose or not bent in the correct place, making it less aesthetically pleasing, but the cosmetic appearance was good. 3: Four to five people felt that the packaging base was loose or not bent in the correct place, making it less aesthetically pleasing, but the cosmetic appearance was generally good. 2: Six to seven people felt that the packaging base was loose or not bent in the correct place, making it less aesthetically pleasing, but there were no problems with aesthetics. 1: 8 to 30 people felt that the packaging base was loose or not bent in the correct place, making it less aesthetically pleasing.

[0065] (Resistance to adhesive marks) The produced toilet roll packaging was evaluated by 30 testers to see how easily the adhesive part left a mark when pressed against the toilet roll of another packaging. The evaluation criteria were as follows: 5: 0 to 1 people felt that the adhesive part of the toilet paper was prone to leaving marks, and the resistance to marks was significantly better. 4: Two or three people felt that the adhesive part of the toilet paper was prone to leaving marks, but the adhesive part was good in that it did not leave marks easily. 3: Four to five people felt that the adhesive part of the toilet paper was prone to leaving marks, but the toilet paper was generally good in terms of not leaving marks. 2: Six to seven people felt that the adhesive on the toilet paper was prone to leaving marks, but there was no problem with it not leaving marks. 1: 8 to 30 people felt that the adhesive part of the toilet roll was prone to leaving marks, making it poor at preventing marks.

[0066] (Moderate adhesiveness at the adhesive joint) The produced toilet roll packaging was evaluated by 30 monitors for adhesiveness at the adhesive joint when the packaging substrate was peeled off from the adhesive joint. The evaluation criteria were as follows: 5: 0 to 1 people felt that the adhesive was too weak and easily peeled off, or that the adhesive was too strong and difficult to peel off, and the adhesiveness was remarkably good. 4: Two to three people felt that the adhesive was too weak and easily peeled off, or that the adhesive was too strong and difficult to peel off, and the adhesiveness was good. 3: Four to five people felt that the adhesive was too weak and easily peeled off, or too strong and difficult to peel off, and the adhesiveness was generally good. 2: Six to seven people felt that the adhesive was too weak and easy to peel off, or too strong and difficult to peel off, but there was no problem with the adhesive. 1: 8 to 30 people felt that the adhesive was too weak and easily peeled off, or too strong and difficult to peel off, indicating poor adhesion.

[0067] <Example 2> to <Example 58>, <Comparative Example 1> to <Comparative Example 4> For Examples 2 to 58 and Comparative Examples 1 to 4, packaging substrates having the physical properties shown in Tables 1 to 4 were prepared in the same manner as in Example 1, and toilet roll packaging bodies (caramel packaging) were prepared using these in the same manner as in Example 1, and the shape after packaging, resistance to marks at the adhesive joints, and appropriate adhesion at the adhesive joints were evaluated. The results are shown in Tables 1 to 4.

[0068] [Table 1]

[0069] [Table 2]

[0070] [Table 3]

[0071] [Table 4]

[0072] As is clear from the results shown in Tables 1 to 4, the packages of Examples 1 to 58 all had excellent shape after packaging, the adhesive hardly left marks, and the adhesive was moderately adhered and easy to peel off. In contrast, the packages of Comparative Examples 1 to 4 all had poor shape after packaging, the adhesive was easily left marks, or the adhesive was difficult to peel off. Therefore, the packaging body of the present invention can provide a toilet roll package in which a toilet roll is packaged in a packaging base material that includes at least a paper base material, and even when bonded with a hot melt adhesive, the shape after packaging is good, there are few defective toilet rolls, and the packaging base material is moderately bonded so that it is easy to peel off. [Explanation of symbols]

[0073] 1 package 10, 20, 30 Packaging base material 11, 21, 31 toilet rolls 12, 22, 32 Adhesive part h Height direction of package 1 L Axial direction of toilet roll 11 P: Circumferential direction of the packaging substrate 10 BP, SP Width of adhesive area 12

Claims

1. A package in which 2, 4 or 6 toilet rolls are packaged in a packaging base material including at least a paper base material, The packaging substrate has a basis weight of 40 g / m ２ 105g / m or more ２ is as follows: The toilet rolls are arranged in one, two or three rows in a direction perpendicular to their axial direction, and when arranged in two or three rows, both end faces of each row are aligned, A toilet roll packaging body, characterized in that a hot melt adhesive is applied to one end of the packaging substrate in a direction approximately perpendicular to the circumferential direction of the packaging substrate, and an adhesive portion is provided that is bonded to the other end of the packaging substrate in the circumferential direction.

2. The toilet roll packaging according to claim 1, wherein the adhesive portion has a spiral shape.

3. The toilet roll packaging according to claim 2, wherein the width of the adhesive portion is 3 mm or more and 40 mm or less.

4. The toilet roll packaging according to claim 2 or 3, wherein the hot melt adhesive is made of a rubber-based material.

5. The toilet roll packaging according to claim 1, wherein the adhesive portion has a bead shape.

6. The toilet roll packaging according to claim 5, wherein the width of the adhesive portion is 1 mm or more and 20 mm or less.

7. The toilet roll packaging according to claim 5 or 6, wherein the hot melt adhesive is made of an olefin-based adhesive.

8. The roll density of the toilet roll is 0.10 g / cm ３ 0.33g / cm or more ３ 8. The toilet roll packaging according to claim 1, wherein:

9. 9. The toilet roll packaging according to any one of claims 1 to 8, characterized in that the packaging is a caramel packaging.

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