Toilet roll wrapper

Abstract

To provide a toilet roll package which packages toilet paper with a non-laminated packaging base material, has a good state after packaging even when bonded by a hot melt adhesive, and prevents breakage of the packaging material.SOLUTION: There is provided a package in which two, four or six toilet rolls are packaged with a non-laminated packaging base material, wherein a roll density (A) of the toilet roll is 0.10 g / cm3 or more and 0.33 g / cm3 or less, in a peripheral length of the packaging base material, a percentage (D:(C / B)×100(%)) of an actual peripheral length (C) of the packaging base material with respect to a theoretical peripheral length (B) determined from a winding diameter of the toilet roll is 97% or more and 106% or less, and a value ((A / E)×1,000) obtained by multiplying a ratio of the roll density (A) to a burst strength (E) of the packaging base material by 1,000 is 0.4 or more and 1.8 or less.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a toilet roll wrapper suitable for wrapping paper products, particularly toilet rolls.

Background Art

[0002] In recent years, there has been a demand for reducing the volume of plastics, mainly for base materials used in packaging, containers, etc.

[0003] For example, copy paper is packaged with a packaging base material mainly made of paper, while in the case of toilet paper, since toilet paper is soft (and its form is unstable), when packaging, the packaging base material may bend at unintended locations, resulting in a poor form after packaging. Also, since paper is thicker and stiffer than film, it is difficult for paper to bend at a predetermined position, and in this regard as well, the form after packaging is inferior.

[0004] As a prior art document of an invention related to a toilet roll wrapper, for example, in Patent Document 1, in a method for manufacturing a toilet roll wrapper that wraps a set of a predetermined number of toilet roll packs in a caramel shape with a paper sheet, a paper sheet made mainly of kraft pulp is used, and a tear line such as a perforation and / or an opening means such as an unsealing tape is provided in advance at the central portion in the longitudinal direction (the paper flow direction during manufacturing) of the sheet. After wrapping the aggregate of the roll packs in a caramel shape with a paper sheet cut to a predetermined size, the front and rear overlapping ends of the paper sheet are adhered on the upper surface of the caramel-shaped wrapper, and further, the side overlapping ends of the caramel-shaped wrapper are sealed with a renewable adhesive tape. A method for manufacturing a toilet roll wrapper is disclosed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] As shown in Fig. 3(a), when the toilet paper is tightly wound, it becomes easier to package. However, after packaging, the portion of the packaging base material 20 that does not contact the toilet roll 21 (loose portion 20s) tends to be in a stretched state, and when holding the package, the packaging base material 20 is likely to be torn. Therefore, if the loose portion 20s is relaxed, tearing is suppressed, but the perimeter of the packaging base material 20 with respect to the toilet roll 21 becomes large (long), and when packaging, the packaging base material 20 may bend at unintended locations, resulting in a poor form after packaging.

[0007] On the other hand, as shown in Fig. 3(b), when the toilet paper is softly wound, after packaging, the toilet roll 31 is likely to be crushed, and the loose portion 30s of the packaging base material 30 becomes short or tends to be loose, making it less likely to tear. However, originally, as described above, the form after packaging is inferior. Therefore, if the basis weight of the paper is reduced so that the packaging base material 30 is likely to bend, then the packaging base material 30 becomes likely to be torn. As described above, if the form after packaging is inferior or the packaging base material is torn, it may become the subject of a claim or may not sell in a retail store. Therefore, it is difficult to package toilet paper with a packaging base material mainly made of paper.

[0008] Also, in order to perform heat sealing, it is known to laminate polyethylene (PE) on the packaging paper. However, when laminated with polyethylene, the strength of the packaging paper increases and the packaging base material becomes less likely to be torn, but the recycling of the paper becomes difficult.

[0009] Therefore, in order to enable the recycling of the paper, it is conceivable to provide a heat-sealing layer and bond it without laminating polyethylene. In this case, since the paper is likely to be torn, it is necessary to increase the basis weight. However, when the basis weight is increased, heat is less likely to be transmitted to the packaging paper, resulting in inferior heat-sealing properties. Therefore, it has been difficult to achieve both the recycling of paper, packaging properties, and heat-sealing properties.

[0010] The present invention has been made in view of such circumstances, and an object thereof is to provide a toilet roll package that is packaged with a non-laminated packaging base material for toilet paper and adhered with a hot melt adhesive, has a good form after packaging, and is less likely to break the packaging base material.

Means for Solving the Problems

[0011] In view of the above problems, the inventors of the present invention conducted intensive research. As a result, by defining the basis weight of the packaging base material and the roll density of the toilet roll, and further defining the percentage of the actual circumference to the theoretical circumference in the circumference of the packaging base material, and the ratio of the roll density to the bursting strength of the packaging base material, it is possible to package toilet paper with a non-laminated packaging base material and adhere it with a hot melt adhesive to obtain a toilet roll package with a good form after packaging and less likely to break the packaging base material. The inventors have found that the above problems can be solved 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 with a non-laminated packaging base material containing at least a paper base material, wherein the basis weight of the packaging base material is 40 g / m 2 or more and 105 g / m 2 or less, the toilet rolls are arranged in two or three rows in a direction perpendicular to the axial direction thereof, and both end faces of each row are aligned, the roll density (A) of the toilet roll is 0.10 g / cm 3 or more and 0.33 g / cm 3 or less, and in the circumference of the packaging base material in a state where the toilet roll is packaged, the percentage (D: (C / B) × 100 (%)) of the actual circumference (C) of the packaging base material to the theoretical circumference (B) obtained from the winding diameter of the toilet roll is 97% or more and 106% or less, and the value obtained by multiplying the ratio of the roll density (A) to the bursting strength (E) of the packaging base material by 1000 ((A / E) × 1000) is 0.4 or more and 1.8 or less. A toilet roll package, characterized by the above. (2) The second aspect of the present invention is the toilet roll package described in (1), wherein the value obtained by multiplying the ratio of the roll density (A) to the above percentage (D) by 1000 ((A / D)×1000) is 1.0 or more and 3.4 or less. (3) The third aspect of the present invention is the toilet roll package described in (1) or (2), wherein the value obtained by dividing the product of the above percentage (D) and the bursting strength (E) by 100 ((D×E) / 100) is 130 or more and 430 or less. (4) The fourth aspect of the present invention is the toilet roll package described in any one of (1) to (3), wherein the bursting strength (E) is 120 kPa or more and 430 kPa or less. (5) The fifth aspect of the present invention is the toilet roll package described in any one of (1) to (4), wherein the package is a caramel package. (6) The sixth aspect of the present invention is the toilet roll package described in any one of (1) to (5), wherein the packaging base material is adhered with a hot melt adhesive. (7) The seventh aspect of the present invention is the toilet roll package described in any one of (1) to (6), wherein the flexural strength of the packaging base material in the MD direction is 60 μN·m or more and 900 μN·m or less. (8) The eighth aspect of the present invention is the toilet roll package described in any one of (1) to (7), wherein the flexural strength of the packaging base material in the CD direction is 30 μN·m or more and 390 μN·m or less.

Advantages of the Invention

[0013] According to the present invention, it is possible to provide a toilet roll package in which toilet paper is packaged with an unlaminated packaging base material and adhered with a hot melt adhesive, and which has a good form after packaging and the packaging base material is not easily torn.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0015] Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as "embodiments") will be described in detail with reference to the drawings. These are presented for illustrative purposes and do not limit the present invention.

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

[0017] Here, the percentage (D: (C / B) × 100 (%)) of the actual circumference (C) of the packaging base material 10 with respect to the theoretically obtained circumference (B) of the toilet roll 11 is 97% or more and 106% or less, preferably 99% or more and 104% or less, and more preferably 100% or more and 102% or less. When the percentage (D) is less than 97%, the portion of the packaging base material 10 that does not contact the toilet roll 11 is likely to be in a stretched state, and the packaging base material 10 is likely to be torn when holding the package 1. When the percentage (D) exceeds 106%, the circumference 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 location during packaging, resulting in a poor form after packaging.

[0018] The theoretical perimeter (B) of the packaging substrate 10, when there are four toilet rolls 11, is obtained by the following formula. Theoretical perimeter (B) = roll diameter × 2 + 2 × 3.14 × (roll diameter ÷ 2) Also, when there are six toilet rolls 11 (3 rows × 2 vertically), it is obtained by the following formula. Theoretical perimeter (B) = roll diameter × 4 + 2 × 3.14 × (roll diameter ÷ 2)

[0019] Also, the actual perimeter (C) of the packaging substrate 10 is measured as follows. First, break the packaging substrate 10 from the state of the package 1 shown in FIG. 1. Next, measure the length of the packaging substrate 10 in the circumferential direction P of the packaging substrate 10 at the center in the height direction (h direction in FIG. 1) corresponding to two or three levels of the toilet roll 11. When there is a portion adhered with hot melt adhesive, although the corresponding portion has two layers of the packaging substrate 10 overlapping, the length of the overlapping portion is not measured, and it is regarded as the length of one round in the circumferential direction P of the packaging substrate 10. Note that the actual perimeter (C) of the packaging substrate 10 is preferably 580 mm or more and 640 mm or less, more preferably 590 mm or more and 630 mm or less, and even more preferably 600 mm or more and 620 mm or less when packaging four rolls with a roll diameter of 117 mm, for example. If the actual perimeter (C) is less than 580 mm, the portion of the packaging substrate 10 that does not contact the toilet roll 11 is likely to be in a stretched state, and the packaging substrate 10 is likely to break when holding the package 1. If the actual perimeter (C) exceeds 640 mm, the perimeter of the packaging substrate 10 with respect to the toilet roll 11 becomes large (long), and the packaging substrate 10 bends at an unintended location during packaging, resulting in an inferior form after packaging.

[0020] In addition, the package 1 may be provided with perforations (not shown) to facilitate opening by breaking the packaging substrate 10. These perforations may be provided, for example, parallel to the axial direction L in a portion of the packaging substrate 10 that does not contact the toilet roll 11, or may be provided parallel to the axial direction L on the side surface portion of the package 1 other than that portion (not shown). Further, the perforations may be provided perpendicular to the axial direction L. For example, on the top surface or the bottom surface of the package 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, they may be provided (not shown). Furthermore, the perforations may be provided on the side surface portion of the package 1 in a direction perpendicular to the axial direction L and along the circumferential direction P of the packaging substrate 10 (not shown). Note that the length of the perforations can be freely set.

[0021] 2. Packaging Substrate The packaging substrate 10 includes at least a paper substrate and is not laminated, but may include other layers. Also, the paper substrate may be printed on the outer surface side when formed as the package 1. In the packaging substrate 10, it is preferable that the portion other than the portion adhered with the hot melt adhesive is mainly composed of the paper substrate, and more preferably the paper substrate is 100%.

[0022] The basis weight of the packaging substrate 10 is 40 g / m 2 or more and 105 g / m 2 or less, preferably 50 g / m 2 or more and 90 g / m 2 or less, and more preferably 60 g / m 2 or more and 80 g / m 2 or less. If the basis weight is less than 40 g / m 2 , the packaging substrate 10 is likely to be torn. If the basis weight exceeds 105 g / m 2 , the packaging substrate 10 is difficult to bend at a predetermined position during packaging, and the form after packaging is inferior. Note that the basis weight of the packaging substrate 10 can be measured in accordance with JIS P 8124, but is measured excluding the portion adhered with the hot melt adhesive described later.

[0023] (1) Paper Substrate The paper base material is manufactured mainly from wood pulp. As the pulp here, softwood kraft pulp, hardwood kraft pulp, groundwood pulp, thermomechanical pulp, chemithermomechanical pulp, and waste paper pulp such as newsprint, flyers, general magazines, coated magazines, thermal recording paper, pressure-sensitive recording paper, imitation paper, colored fine paper, copy paper, computer output paper, or a mixture of these waste papers, etc., known pulps in the past can be used alone or in any blending ratio.

[0024] In the paper base material of the package 1 of the present invention, as the pulp to be used, it is preferably 30% by weight or more and 100% by weight or less of softwood kraft pulp and 0% by weight or more and 70% by weight or less of hardwood kraft pulp, more preferably 50% by weight or more and 100% by weight or less of softwood kraft pulp and 0% by weight or more and 50% by weight or less of hardwood kraft pulp, and still more preferably 70% by weight or more and 100% by weight or less of softwood kraft pulp and 0% by weight or more and 30% by weight or less of hardwood kraft pulp. By using the above pulp blend, the packaging base material 10 is less likely to tear, and is more likely to bend at a predetermined position during packaging, and a package 1 with an excellent post-packaging form can be obtained. Also, it is preferably unbleached pulp.

[0025] Materials other than pulp fibers may be blended as auxiliary materials in the pulp slurry. In the package 1, usually, the content ratio of pulp fibers is 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 still more preferably 90% by weight or more and 100% by weight or less. By setting the pulp content as above, the packaging base material 10 is less likely to tear, and is more likely to bend at a predetermined position during packaging, and a package 1 with an excellent post-packaging form can be obtained.

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

[0027] In addition, various commonly used additives, such as wet paper strength improvers, fillers, sizing agents, dry paper strength enhancers, yield improvers, coloring pigments, etc., may be appropriately added in appropriate amounts to the paper base material if necessary.

[0028] The wet paper strength improver can be selected from known ones commonly used. For example, it is preferably selected from polyamide-polyamine resins, polyacrylamide resins, melamine resins, etc. The blending amount (mass in the absolutely dry state) of such a wet paper strength improver is usually 0.01% by weight or more and 0.7% by weight or less, preferably 0.02% by weight or more and 0.5% by weight or less, more preferably 0.03% by weight or more and 0.3% by weight or less, based on the pulp (mass in the absolutely dry state). Even if the blending amount of the wet paper strength improver exceeds 0.7% by weight, it is difficult to obtain an effect commensurate with the blending amount. As a result, the cost increases, and the release property deteriorates, which may make it difficult to reuse the package 1 of the present invention later. Also, when the blending amount of the wet paper strength improver is less than 0.01% by weight, it is difficult to obtain sufficient wet paper strength, and it may be easily torn when wetted with water and the function as the package 1 is inferior.

[0029] In the package 1 of the present invention, these raw materials can be formed into a paper base material of the packaging base material 10 by an ordinary papermaking process.

[0030] (2) Other Layers The packaging base material 10 of the present invention may include other layers in addition to the paper base material. Examples of other layers include a water vapor barrier layer, an oxygen barrier layer, a printing layer, a printing suitability improving layer, an overprint layer, a light shielding layer, etc. These other layers can be provided, for example, on the front side or the back side of the paper base material, and may be one layer or two or more layers.

[0031] (3) Physical Properties of the Entire Packaging Base Material As described below, the packaging form of the package 1 according to the present invention has various types. There are cases where the toilet roll 11 is packaged so as to wrap it from the manufacturing line direction (transport direction; MD direction), and cases where the toilet roll 11 is packaged so as to wrap it from the width direction (CD direction) orthogonal to the manufacturing 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 2.5 kN / m or more and 7.5 kN / m or less, more preferably 3.3 kN / m or more and 6.0 kN / m or less, and still more preferably 4.0 kN / m or more and 5.8 kN / m or less. If the tensile strength in the MD direction is less than 2.5 kN / m, the packaging base material 10 is likely to be torn. If the tensile strength in the MD direction exceeds 7.5 kN / m, the packaging base material 10 is difficult to bend at a predetermined position during packaging, and the form after packaging is inferior.

[0032] 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 1.5 kN / m or more and 5.0 kN / m or less, more preferably 2.0 kN / m or more and 4.2 kN / m or less, and still more preferably 2.5 kN / m or more and 3.8 kN / m or less. If the tensile strength in the CD direction is less than 1.5 kN / m, the packaging base material 10 is likely to be torn. If the tensile strength in the CD direction exceeds 5.0 kN / m, the packaging base material 10 is difficult to bend at a predetermined position during packaging, and the form after packaging is inferior. By setting the tensile strengths of the packaging base material 10 in the MD direction and the CD direction within the above ranges, it is possible to obtain the package 1 in which the packaging base material 10 is difficult to be torn, is easily bent at a predetermined position during packaging, and has an excellent form after packaging. The tensile strength of the packaging base material 10 can be measured in accordance with JIS P 8113, but it is measured excluding the portion adhered with the hot melt adhesive described below.

[0033] The bursting strength (E) of the packaging base material 10 is preferably 120 kPa or more and 430 kPa or less, more preferably 150 kPa or more and 380 kPa or less, and still more preferably 200 kPa or more and 320 kPa or less. If the bursting strength (E) is less than 120 kPa, the packaging base material 10 is likely to be torn. If the bursting strength (E) exceeds 430 kPa, the packaging base material 10 is difficult to bend at a predetermined position during packaging, and the form after packaging is inferior. By setting the bursting strength (E) of the packaging base material 10 within the above range, it is possible to obtain the package 1 in which the packaging base material 10 is difficult to be torn, is easily bent at a predetermined position during packaging, and has an excellent form after packaging. The bursting strength (E) of the packaging base material 10 can be measured in accordance with JIS P 8112, but it is measured excluding the portion adhered with the hot melt adhesive described later.

[0034] Also, the value obtained by dividing the product of the percentage (D) and the bursting strength (E) by 100 ((D × E) / 100) is preferably 130 or more and 430 or less, more preferably 160 or more and 380 or less, and still more preferably 200 or more and 310 or less. If the value is less than 130, the packaging base material 10 is likely to be torn. If the value exceeds 430, the packaging base material 10 is difficult to bend at a predetermined position during packaging, and the form after packaging is inferior.

[0035] When wrapping the toilet roll 11 from the MD direction, the bending strength of the packaging base material 10 in the MD direction is preferably 60 μN·m or more and 900 μN·m or less, more preferably 100 μN·m or more and 700 μN·m or less, and still more preferably 200 μN·m or more and 550 μN·m or less. If the bending strength in the MD direction is less than 60 μN·m, the packaging base material 10 is likely to be torn. If it exceeds 900 μN·m, the packaging base material 10 is difficult to bend at a predetermined position during packaging, and the form after packaging is inferior.

[0036] 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 30 μN·m or more and 390 μN·m or less, more preferably 40 μN·m or more and 300 μN·m or less, and still more preferably 70 μN·m or more and 230 μN·m or less. If the bending stiffness in the CD direction is less than 30 μN·m, the packaging base material 10 is likely to be torn. If it exceeds 390 μN·m, the packaging base material 10 is difficult to bend at a predetermined position during packaging, and the form after packaging is inferior. When the bending stiffness of the packaging base material 10 in the MD direction or CD direction is within the above range, the packaging base material 10 is difficult to be torn, and it is easy to bend at a predetermined position during packaging, so that the package 1 with excellent form after packaging 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 in accordance with ISO 2493, but it is measured excluding the portion adhered with the hot melt adhesive described later. Note that since the bending stiffness is the strongest when the 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.

[0037] The thickness of the packaging base material 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 still more preferably 90 μm or more and 120 μm or less. If the thickness is less than 50 μm, the packaging base material 10 is likely to be torn. If it exceeds 160 μm, the packaging base material 10 is difficult to bend at a predetermined position during packaging, and the form after packaging is inferior. By setting the thickness of the packaging base material 10 within the above range, the packaging base material 10 is difficult to be torn, and it is easy to bend at a predetermined position during packaging, so that the package 1 with excellent form after packaging can be obtained. The thickness of the packaging base material 10 can be measured in accordance with JIS P 8118:1998. The pressure condition of the pressing surface is 100 kPa.

[0038] The density of the packaging base material 10 is 0.50 g / cm 3 or more and 0.85 g / cm 3It is preferably the following, 0.55 g / cm 3 or more and 0.80 g / cm 3 or less, more preferably 0.60 g / cm 3 or more and 0.75 g / cm 3 or less. If the density is less than 0.50 g / cm 3 , the packaging base material 10 becomes too thick, making it difficult for the packaging base material 10 to bend at a predetermined position, resulting in an inferior form after packaging. If it exceeds 0.85 g / cm 3 , the packaging base material 10 becomes too thin, making it difficult for the packaging base material 10 to bend at a predetermined position, resulting in an inferior form after packaging. When the density of the packaging base material 10 is within the above range, the packaging base material 10 is less likely to tear, and it is easy to bend at a predetermined position during packaging, enabling the package 1 with an excellent form after packaging to be obtained. Also, it is easy to achieve the required strength, flexibility and softness of the packaging base material 10. The density of the packaging base material 10 can be measured and calculated in accordance with JIS P 8118:1998, but it is measured excluding the parts adhered with the hot melt adhesive described later.

[0039] 3. Toilet roll FIG. 2 is a perspective view showing an example of the arrangement of the toilet roll 11 packaged in the package 1 of the present invention. The package 1 of the present invention packages 2, 4 or 6 toilet rolls 11. If the number of rolls exceeds 6, the package 1 becomes heavy and the packaging base material 10 is likely to tear.

[0040] Also, the toilet rolls 11 are arranged in two or three rows in a direction perpendicular to their axial direction, and both end faces of each row are aligned. As for the arrangement, it is preferably any one of the arrangements shown in FIGS. 2(b) to (e), more preferably the arrangement shown in FIG. 2(c) or (d), and even more preferably the arrangement shown in FIG. 2(c). When the number of rows of rolls (the number of rolls in the horizontal direction) exceeds three rows (three rolls), the size of the package 1 becomes large, and when packaging, the packaging base material 10 is less likely to bend at a predetermined position, resulting in a poor form after packaging. When the number of stacked rolls (the number of rolls in the vertical direction) exceeds three, the size of the package 1 becomes large, and when packaging, the packaging base material 10 is less likely to bend at a predetermined position, resulting in a poor form after packaging. Note that the arrangement as shown in FIG. 2(a) is not included in the embodiments. When the number of rows of rolls is one row as shown in FIG. 2(a), packaging is possible, but the size of the package 1 becomes small, and when packaging, the packaging base material 10 is less likely to bend at a predetermined position, resulting in a poor form after packaging. Also, both end faces of each row may be offset by several millimeters due to fluctuations in the roll width of each toilet roll 11 or the like.

[0041] The ply number of the toilet roll 11 is not particularly limited, but is preferably 1 ply or 2 plies, and more preferably 2 plies. When the toilet roll 11 is 2 plies, the wound length 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. When it is 1 ply, the wound length 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 it is less than 35 m in the case of 2 plies or less than 80 mm in the case of 1 ply, when making a certain roll diameter, the roll density becomes low, resulting in a poor form after packaging. If it exceeds 103 mm in the case of 2 plies or exceeds 203 mm in the case of 1 ply, when making a certain roll diameter, the roll density becomes high, and the packaging base material 10 is likely to tear.

[0042] Also, 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 127 mm or less, and even more preferably 115 mm or more and 122 mm or less. If the winding diameter is less than 105 mm, when packaging the packaging base material 10 in contact with the toilet roll 11, the packaging base material 10 is difficult to bend at a predetermined position, resulting in a poor form after packaging. If it exceeds 140 mm, the portion of the packaging base material 10 not in contact with the toilet roll 11 becomes large, and the packaging base material 10 is likely to be torn. By setting the winding length and winding diameter of the toilet roll 11 within the above ranges, it becomes easier to adjust to a predetermined roll density. When packaging the toilet roll 11 with the packaging base material 10, it is possible to obtain the package 1 that is less likely to be torn, is easy to bend at a predetermined position during packaging, and has an excellent form after packaging.

[0043] 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, when setting a certain winding diameter, winding length, and basis weight, the roll density becomes low, resulting in a poor form after packaging. If it exceeds 55 mm, when setting a certain winding diameter, winding length, and basis weight, the roll density becomes high, and the packaging base material 10 is likely to be torn.

[0044] Also, the basis weight per ply of the toilet roll 11 is, in the case of 2 plies, preferably 12 g / m 2 or more and 18 g / m 2 or less, more preferably 13 g / m 2 or more and 17 g / m 2 or less, and even more preferably 14 g / m 2 or more and 16 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 20 g / m 2 or less, and even more preferably 15 g / m 2 or more and 18 g / m2 It is more preferable that it is as follows. When it is 2-ply, less than 12 g / m 2 or when it is 1-ply, less than 13 g / m 2 If it is less, when making a constant roll diameter and roll length, the roll density becomes low and the form after packaging is inferior. When it is 2-ply, more than 18 g / m 2 or when it is 1-ply, more than 22 g / m 2 If it exceeds, when making a constant roll diameter and roll length, the roll density becomes high and the packaging base material 10 is likely to be torn.

[0045] Furthermore, the weight per 114 mm of roll width in one roll excluding the core of the toilet roll 11 is preferably 120 g or more and 370 g or less, more preferably 135 g or more and 330 g or less, and even more preferably 190 g or more and 305 g or less. If the weight is less than 120 g, when making a constant roll diameter, the roll density becomes low and the form after packaging is inferior, and if the weight exceeds 370 g, when making a constant roll diameter, the roll density becomes high and the packaging base material 10 is likely to be torn. By setting the outer diameter, basis weight, and weight of the core of the toilet roll 11 within the above ranges, it becomes easy to adjust to a predetermined roll density. And when packaging the toilet roll 11 with the packaging base material 10, the packaging base material 10 is less likely to be torn, and it is easy to bend at a predetermined position during packaging, and a package 1 with an excellent form after packaging can be obtained.

[0046] Also, the roll density of the toilet roll 11 is 0.10 g / cm 3 or more and 0.33 g / cm 3 or less, and preferably 0.12 g / cm 3 or more and 0.31 g / cm 3 or less, and more preferably 0.18 g / cm 3 or more and 0.27 g / cm 3 or less. If the roll density is less than 0.10 g / cm 3 the toilet roll 11 is soft and its form is unstable, so the packaging base material 10 bends at an unintended location during packaging, and the form after packaging is inferior. If the roll density is 0.33 g / cm 3If it exceeds this value, the portion of the packaging base material 10 that does not contact the toilet roll 11 is likely to be in a stretched state, and when holding the package 1, the packaging base material 10 is likely to be torn. By setting the roll density of the toilet roll 11 within the above range, the packaging base material 10 is difficult to be torn, and it is easy to bend at a predetermined position during packaging, and a package 1 with an excellent form after packaging can be obtained.

[0047] Note that 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 dividing the mass of one toilet roll 11 excluding the core by this volume. For example, when the roll weight per roll width of 114 mm (excluding the core) is 201 g, the winding diameter is 130 mm, and the outer diameter of the core is 39 mm, 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 It becomes like this. At this time, the measurement of the roll density is carried out after maintaining the equilibrium state under the temperature and humidity conditions specified in JIS P 8111 (23 ± 1°C, 50 ± 2% RH).

[0048] Furthermore, the value obtained by multiplying the ratio of the roll density (A) to the rupture strength (E) of the packaging base material 10 by 1000 ((A / E)×1000) is 0.4 or more and 1.8 or less, preferably 0.5 or more and 1.5 or less, and more preferably 0.6 or more and 1.2 or less. If the value is less than 0.4, the toilet roll 11 is too soft and the form is not stable with respect to the strength of the packaging base material 10. Therefore, when packaging, the packaging base material 10 bends at an unintended location, resulting in a poor form after packaging. If the value exceeds 1.8, since the roll density becomes high with respect to the strength of the packaging base material 10, the packaging base material 10 is likely to be torn.

[0049] Moreover, it is preferable that the value obtained by multiplying the ratio of the roll density (A) to the percentage (D) by 1000 ((A / D)×1000) is 1.0 or more and 3.4 or less, more preferably 1.2 or more and 3.1 or less, and still more preferably 1.5 or more and 2.8 or less. If the value is less than 1.0, the toilet roll 11 is too soft and its form is unstable, so that when being packaged, the packaging base material 10 bends at an unintended location and the form after packaging is inferior. If the value exceeds 3.4, the portion where the packaging base material 10 does not contact the toilet roll 11 is likely to be in a stretched state, and the packaging base material 10 is likely to be torn when the package 1 is held.

[0050] In addition, the paper thickness of 10 sheets of toilet paper (10 sheets for single-ply, 10 sheets for 5 sets in the case of double-ply) used for the toilet roll 11 is preferably 0.4 mm / 10 sheets or more and 1.1 mm / 10 sheets or less, more preferably 0.5 mm / 10 sheets or more and 1.0 mm / 10 sheets or less, and still more preferably 0.6 mm / 10 sheets or more and 0.9 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: measurement load 3.7 kPa, measuring head diameter 30 mm. A sample is placed between the measuring head and the measuring table, and the gauge is read when the measuring head is lowered at a speed of 1 mm or less per second. Also, the measurement is repeated 10 times and the measurement results are averaged.

[0051] 4. Packaging form As the packaging form of the package 1 according to the present invention, caramel packaging is preferable.

[0052] The caramel packaging means that a packaging base material extending along one direction of the object to be packaged is used to wrap the object to be packaged in a direction parallel to or intersecting this direction, or the object to be packaged is inserted from one end in the axial direction of the packaging base material that has been pre-formed into a cylindrical shape. Then, among the packaging base materials protruding from both ends of the object to be packaged, two opposing flap-shaped sides are folded together, and then the other two opposing flap-shaped sides are similarly folded together, and these folded portions are sealed with an adhesive such as glue. This caramel packaging can be carried out using known devices. In FIG. 1, flaps are formed at both ends in a direction parallel to the axis of the toilet roll 11, but flaps may also be formed at both ends in a direction perpendicular to the axial direction L of the toilet roll 11. Also, a hot melt adhesive is preferably used as the adhesive.

[0053] In a certain embodiment, for example, when using a packaging base material 10 with a bending resistance in the MD direction of 60 μN·m or more and 900 μN·m or less, the package 1 of the present invention, for example, conveys the packaging base material 10 in the form of a continuous sheet, arranges the toilet roll 11, and then wraps and packages the toilet roll 11 while wrapping it from the conveying direction (manufacturing line direction; MD direction), and cuts it to a predetermined size from the width direction (CD direction) orthogonal to the conveying direction, that is, when the wrapping direction (circumferential direction P of the packaging base material 10) is the MD direction of the packaging base material 10, it is particularly preferably applied. When the wrapping direction is the MD direction, the packaging base material 10 is more likely to bend properly in the width direction (CD), and it becomes easier to package when folding and adhering the flaps at the top and bottom surfaces. In this case, in the package 1 of the present invention, it is preferable to select caramel packaging as the packaging form. Note that the toilet roll 11 may be arranged after cutting the packaging base material 10 to a predetermined size, or the packaging base material 10 may be cut to a predetermined size after arranging the toilet roll 11.

[0054] In another embodiment, for example, when using the packaging base material 10 with a bending strength in the CD direction of 30 μN·m or more and 390 μN·m or less, the package 1 of the present invention, for example, conveys the packaging base material 10 in the form of a continuous sheet, arranges the toilet roll 11, and then packages while wrapping the toilet roll 11 from the width direction (CD direction) orthogonal to the conveyance direction (manufacturing line direction; MD direction), that is, when the wrapping direction is the CD direction of the packaging base material 10, it is particularly preferably applied. When the wrapping direction is the CD direction of the packaging base material 10, the packaging base material 10 is more likely to bend in the wrapping direction, making it easier to package. In this case as well, the packaging base material 10 may be cut to a predetermined size and then the toilet roll 11 may be arranged, or the packaging base material 10 may be cut to a predetermined size after arranging the toilet roll 11.

[0055] As described above, the present invention has been described using embodiments, but it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It is obvious to those skilled in the art that various changes or improvements can be made to the above embodiments. Also, it is obvious from the description of the claims that forms with such changes or improvements can also be included in the technical scope of the present invention.

Examples

[0056] Hereinafter, the present invention will be described in detail with reference to examples. Note that the present invention is not limited to the examples shown below.

[0057] In the examples and comparative examples, the physical property values of the produced packaging base materials were measured by the following method.

[0058] (Grammage of the packaging base material) The grammage of the packaging base material was measured in accordance with JIS P 8124.

[0059] (Thickness of the packaging base material) The thickness of the packaging base material was measured in accordance with JIS P 8118:1998 using an automatic lifting type paper thickness gauge standard model TM-600 (manufactured by Kumagai Riki Kogyo Co., Ltd.). The pressure condition of the pressurizing surface was 100 kPa.

[0060] (Density of the packaging substrate) The density of the packaging substrate was measured and calculated in accordance with JIS P 8118:1998.

[0061] (Tensile strength in the MD and CD directions of the packaging substrate) The tensile strength in the MD and CD directions of the packaging substrate was measured in accordance with JIS P 8113.

[0062] (Bursting strength of the packaging substrate) The bursting strength (E) of the packaging substrate was measured in accordance with JIS P 8112. In addition, using a Mullen bursting strength tester manufactured by Kumagai Riki Kogyo Co., Ltd., the measurement was carried out under the measurement conditions for low pressure.

[0063] (Measurement of bending stiffness in the MD and CD directions of the packaging substrate) The bending stiffness in the MD and CD directions of the packaging substrate was measured in accordance with the method described in ISO 2493, using an L&W Bending Tester (manufactured by Lorentzen & Wettre). For the test piece of the packaging substrate with a width of 38 mm and a length of 100 mm, when the bending angle was 15 degrees and the bending length (span of the specimen stage) was 10 mm, the measured value was taken as the bending resistance (load), and the bending stiffness (μN·m) was obtained by the following calculation formula. Bending stiffness (μN·m) = 60 × Bending resistance (mN) × Bending length 10 (mm) 2 ÷ (π × Bending angle 15 (°) × Sample width 38 (mm)) In addition, when a test piece with a length of 100 mm cannot be sampled, the length of the test piece can be shortened. Also, the test piece should not include perforations, but when perforations must be included to ensure the size of the test piece, perforations may be included.

[0064] (Example 1) (Packaging substrate) A paper base material was prepared using 100% by weight of unbleached softwood kraft pulp (NUKP) as the pulp raw material, and it was used as the packaging base material as it was. Table 1 shows the results of measuring the basis weight, thickness, density, tensile strength in the MD direction and CD direction, bending strength in the MD direction and CD direction, and bursting strength (E) of the packaging base material.

[0065] (Toilet roll) Also, four toilet rolls with the roll length, roll diameter, number of plies, core outer diameter, basis weight per ply, weight per 114 mm of roll width, and roll density (A) shown in Table 1 were prepared.

[0066] (Toilet roll package (caramel packaging)) Using the prepared packaging base material, a package was made from 650 mm in the MD direction of the packaging base material × 420 mm in the CD direction of the packaging base material (at this time, since the packaging base material is in the state before packaging the toilet roll, the length is different from the actual circumference (C) of each example and comparative example). Then, four toilet rolls (2 vertically × 2 horizontally) were placed in this package and sealed by caramel packaging to obtain a toilet roll package. Note that it was in a form of packaging while wrapping the toilet roll from the CD direction. And in the toilet roll package, the percentage (D) of the actual circumference (C) of the packaging base material with respect to the theoretical circumference (B) was calculated, and using the bursting strength (E) and roll density (A), (A / E) × 1000, (A / D) × 1000, and (D × E) / 100 were obtained respectively.

[0067] (Goodness of the form after packaging (cosmetic property)) Regarding the prepared toilet roll package, the goodness of the form (cosmetic property) when visually observing the appearance of the package was evaluated by 30 monitors. The evaluation criteria are as follows. 5: People who felt that the packaging base material was slack or not bent at the predetermined position, resulting in poor cosmetic property, 0 - 1 person 4: People who felt that the packaging base material was slack or not bent at the predetermined position, resulting in poor cosmetic property, 2 - 3 people 3: 4 to 6 people who felt that the packaging substrate was slack or not bent at the specified position, resulting in poor aesthetics 2: 7 to 20 people who felt that the packaging substrate was slack or not bent at the specified position, resulting in poor aesthetics 1: 21 to 30 people who felt that the packaging substrate was slack or not bent at the specified position, resulting in poor aesthetics

[0068] (Resistance to tearing of the packaging substrate) Regarding the produced toilet roll package, 30 people evaluated the resistance to tearing of the packaging substrate when the package was grasped from both sides with one hand. The evaluation criteria are as follows. 5: 0 to 1 person who felt that the packaging substrate was easy to tear 4: 2 to 3 people who felt that the packaging substrate was easy to tear 3: 4 to 6 people who felt that the packaging substrate was easy to tear 2: 7 to 20 people who felt that the packaging substrate was easy to tear 1: 21 to 30 people who felt that the packaging substrate was easy to tear In addition, the goodness of the form after packaging and the resistance to tearing of the packaging substrate were evaluated from two viewpoints: the roll density of the toilet roll and the slack in the circumferential direction of the packaging substrate, as well as the basis weight of the packaging substrate.

[0069] (Example 2) to (Example 24), (Comparative Example 1) to (Comparative Example 6) In the same manner as in Example 1, packaging substrates having the physical properties shown in Tables 1 and 2 were produced for Examples 2 to 24 and Comparative Examples 1 to 6. Using these, toilet roll packages (caramel packages) were produced in the same manner as in Example 1, and the resistance to tearing of the packaging substrate and the form after packaging were evaluated. In each example and each comparative example, the size and number of rolls of the packaging substrate were appropriately adjusted. The results are shown in Table 1.

[0070]

Table 1

[0071] As is clear from the results shown in Table 1, in all of the packages of Examples 1 to 24, the packaging base material was difficult to tear and excellent in the form after packaging. On the other hand, in all of Comparative Examples 1 to 6, the packaging base material was easy to tear or inferior in the form after packaging. Therefore, the package of the present invention can provide a toilet roll package in which, even when toilet paper is packaged with an unlaminated packaging base material and adhered with a hot melt adhesive, the form after packaging is good and the packaging base material is difficult to tear.

Explanation of Signs

[0072] 1 Package 10, 20, 30 Packaging base material 20s, 30s Slack part 11, 21, 31 Toilet roll L Axial direction of the toilet roll P Circumferential direction of the packaging base material

Claims

1. A non-laminated packaging substrate containing at least a paper substrate, which is a package for packaging 2, 4 or 6 toilet rolls, The basis weight of the packaging substrate is 40 g / m ２ or more and 105 g / m ２ or less, and wherein the toilet rolls are arranged in 2 or 3 rows in a direction perpendicular to their axial direction, and both end faces of each row are aligned, The roll density (A) of the toilet roll is 0.10 g / cm ３ or more and 0.33 g / cm ３ or less, in the perimeter of the packaging substrate in the state of packaging the toilet rolls, the percentage (D: (C / B)×100 (%)) of the actual perimeter (C) of the packaging substrate to the theoretical perimeter (B) obtained from the winding diameter of the toilet roll is 97% or more and 106% or less, the value obtained by multiplying the ratio of the roll density (A) to the bursting strength (E) of the packaging substrate by 1000 ((A / E)×1000) is 0.4 or more and 1.8 or less, the value obtained by dividing the product of the percentage (D) and the bursting strength (E) by 100 ((D×E) / 100) is 130 or more and 430 or less, A toilet roll package, characterized in that the bending resistance in the MD direction of the packaging substrate is 60 μN·m or more and 900 μN·m or less.

2. The toilet roll package according to Claim 1, characterized in that the value obtained by multiplying the ratio of the roll density (A) to the percentage (D) by 1000 ((A / D)×1000) is 1.0 or more and 3.4 or less.

3. The toilet roll package according to Claim 1 or 2, characterized in that the bursting strength (E) is 120 kPa or more and 430 kPa or less.

4. The toilet roll package according to any one of Claims 1 to 3, characterized in that the package is a caramel package.

5. The toilet roll package according to any one of Claims 1 to 4, characterized in that the packaging substrate is adhered with a hot melt adhesive.

6. The toilet roll package according to any one of Claims 1 to 5, characterized in that the bending resistance in the CD direction of the packaging substrate is 30 μN·m or more and 390 μN·m or less.

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