Toilet roll packaging and method for manufacturing toilet roll packaging

Abstract

To provide a toilet roll package in which a form after packaging is favorable even when a toilet roll is packaged with a packaging base material including a paper base material, in which dirt is less likely to attach to the packaging base material, and which has an excellent transport property, and to provide a manufacturing method of toilet roll package.SOLUTION: A toilet roll package is provided which packages two, four or six toilet rolls by a packaging base material at least including a paper base material. A manufacturing method of toilet roll package is provided in which the roll density of the toilet roll is equal to or greater than 0.10 g / cm3 and equal to or less than 0.34 g / cm3, the weight per roll width 114 mm in one roll including a core is equal to or greater than 120 g and equal to or less than 380 g, the toilet rolls are arranged in one row, two rows or three rows in the direction perpendicular to the axial direction, and in the case of in two rows or three rows, both end surfaces of any row are aligned, and the dynamic friction coefficient of the packaging base material is equal to or greater than 0.12 and equal to or less than 0.46.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] In recent years, there has been a growing demand for reducing the volume of plastics, particularly those used as base materials for packaging and containers.

[0003] For example, copy paper is packaged in a paper-based packaging material, whereas toilet paper (toilet rolls) is soft (and therefore does not maintain its shape), so when packaged in a paper-based material, the packaging material bends in unintended places, resulting in an inferior shape after packaging. Also, paper is thicker and stiffer than film, making it difficult to bend in the desired position, which also contributes to an inferior shape after packaging.

[0004] As a prior art document relating to an invention concerning toilet roll packaging, for example, Patent Document 1 discloses a method for manufacturing toilet roll packaging in which a predetermined number of toilet roll packs are assembled and wrapped in a paper sheet in a caramel-like manner, characterized in that a paper sheet made mainly from kraft pulp is used, an easy-cutting line such as a perforation and / or an opening means such as an opening tape is provided in advance in the center of the sheet in the longitudinal direction (the direction of paper flow during manufacturing), the assembly of roll packs is wrapped in a caramel-like manner with a paper sheet cut to a predetermined size, the front and rear overlapping ends of the paper sheet are bonded on the top surface of the caramel-like packaging, and the side overlapping ends of the caramel-like packaging are sealed with recyclable adhesive tape. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2003-054504

Summary of the Invention

Problems to be Solved by the Invention

[0006] When packing a general film-wrapped toilet roll package in cardboard, a case packer (box packing machine) is often used. When packing with a case packer, the package is conveyed by a conveyor, but the package waiting to be boxed in the holding section immediately before the case packer rubs against the continuously moving conveyor.

[0007] In the case of general film packaging, there is no problem even if the package rubs against the conveyor (in the case of film, even if conveyor dirt adheres to the film, it only adheres lightly to the surface and can be easily removed). However, in the case of paper packaging, when conveyor dirt adheres to the paper, the dirt becomes like it is printed on the surface and cannot be removed, resulting in defective products.

[0008] Therefore, if the roll density of the toilet roll is lowered and the weight is reduced (made lighter) so that dirt adheres less easily, the degree of rubbing between the conveyor and the roll becomes smaller and the adhesion of dirt is reduced. However, since the roll density becomes low and it becomes a soft roll (the winding becomes softer), packaging becomes difficult. Also, if slippery paper is used so that dirt adheres less easily to the paper, the adhesion of dirt is reduced, but the package becomes too slippery and the transportability when transporting the package by conveyor is inferior.

[0009] Therefore, it has been difficult to use a package in which a roll with a long roll length and a high (heavy) roll weight is wrapped with paper to have good packaging properties and to make it difficult for dirt to adhere on the conveyor.

[0010] The present invention has been made in view of such circumstances, and an object thereof is to provide a toilet roll package and a method for manufacturing a toilet roll package in which even when a toilet roll is packaged with a packaging base material containing a paper base material, the form after packaging is good, dirt hardly adheres to the packaging base material, and the transportability is good.

Means for Solving the Problems

[0011] In view of the above problems, the inventors of the present invention conducted diligent research. As a result, they found that by defining the roll density of the toilet rolls and the weight of one roll including the core in a toilet roll packaging body packaged in a predetermined number and arrangement, and further defining the coefficient of dynamic friction of the packaging material, it is possible to create a toilet roll packaging body that maintains a good shape after packaging and is less prone to dirt adhering to the packaging material, even when toilet rolls are packaged with a packaging material including a paper material, thereby solving the above problems and completing the present invention. Specifically, the present invention provides the following:

[0012] (1) A first aspect of the present invention is a packaging body comprising a packaging material including at least a paper base, in which two, four, or six toilet rolls are packaged, wherein the roll density of the toilet rolls is 0.10 g / cm³. 3 More than 0.34g / cm 3 The following describes a toilet roll packaging characterized in that the weight per 114 mm of roll width in one roll including the core is 120 g or more and 380 g or less, the toilet rolls are arranged in one, two, or three rows perpendicular to their axial direction, and in the case of two or three rows, both end faces of each row are aligned, and the dynamic friction coefficient of the packaging material is 0.12 or more and 0.46 or less. (2) A second aspect of the present invention is a toilet roll packaging described in (1), wherein the basis weight of the packaging material is 40 g / m². 2 More than 105g / m 2 It is characterized by the following: (3) A third aspect of the present invention is a toilet roll packaging according to (1) or (2), characterized in that the smoothness of the packaging base material is 7 seconds or more and 55 seconds or less according to the Ogan formula. (4) A fourth aspect of the present invention is a toilet roll packaging according to any one of (1) to (3), characterized in that the packaging is caramel packaging. (5) A fifth aspect of the present invention is a method for manufacturing a toilet roll packaging as described in (4), characterized in that the direction of wrapping (the circumferential direction of the packaging material) when wrapping the toilet roll with the packaging material is the MD direction of the packaging material. [Effects of the Invention]

[0013] According to the present invention, even when toilet rolls are packaged with a packaging material containing a paper base material, the packaged toilet roll packaging has a good shape, is less prone to dirt adhering to the packaging material, and has good transportability. A method for manufacturing a toilet roll packaging is also available. [Brief explanation of the drawing]

[0014] [Figure 1] This is a perspective view showing an example of a toilet roll packaging according to one embodiment of the present invention. [Figure 2] This is a perspective view showing an example of the arrangement of toilet rolls packaged in the toilet roll packaging of the present invention. [Modes for carrying out the invention]

[0015] The embodiments for carrying out the present invention will be described in detail below with reference to the drawings, but these are provided for illustrative purposes only and do not limit the present invention.

[0016] 1. Toilet roll packaging Figure 1 is a perspective view showing an example of the toilet roll packaging of the present invention (hereinafter also simply referred to as "packaging"). As shown in Figure 1, the packaging 1 of the present invention is a packaging material 10 which includes at least a paper base material, and it packages 2, 4, or 6 (4 in Figure 1) toilet rolls 11. The packaging form of the toilet rolls 11 will be described later. In addition, in the packaging 1, the packaging base material 10 may cover only a part of the toilet roll 11, rather than the entire roll, and the toilet roll 11 does not need to be sealed (not shown).

[0017] Furthermore, the packaging 1 may be provided with perforations (not shown) to facilitate opening by tearing the packaging base material 10. These perforations may be provided, for example, parallel to the axial direction L (height direction h of the packaging 1) in the portion of the packaging base material 10 that does not come into contact with the toilet roll 11, or parallel to the axial direction L on the side portion of the packaging 1 other than that 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 1, perpendicular to the axial direction L and in a direction connecting the centers of the axes of two or three rows of toilet rolls 11 (not shown). In addition, the perforations may be provided on the side portion of the packaging 1 in a direction 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.

[0018] 2.Packaging base material The packaging base material 10 includes at least a paper base material, but may also include other layers; for example, PE laminated paper may be used from the viewpoint of waterproofing. Furthermore, the paper base material may have printing applied to its outer surface when formed as the packaging body 1. In the packaging base material 10, it is preferable that the paper base material is the main component, and it is more preferable that the paper base material is 100%.

[0019] (1)Paper base material Paper substrates are manufactured using wood pulp as the main raw material. The pulp used here can be conventionally known pulps, either individually or in any proportion, such as softwood kraft pulp, hardwood kraft pulp, crushed wood pulp, thermomechanical pulp, chemothermetic pulp, or recycled paper pulp such as newspaper, flyers, newsprints, coated magazines, thermal recording paper, pressure-sensitive recording paper, imitation paper, colored fine paper, copy paper, computer output paper, or mixtures of these recycled papers. Among these, kraft paper is preferred.

[0020] In the paper substrate of the packaging 1 of the present invention, the pulp used 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. By using the above pulp composition, the slipperiness of the paper is appropriate, dirt does not adhere easily, and a packaging 1 with a good shape after packaging can be obtained. Furthermore, it is preferable that the pulp is unbleached pulp.

[0021] The pulp slurry may contain materials other than pulp fibers as auxiliary materials. In the packaging 1, it is generally preferable that the pulp fiber content be 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 using the above pulp content, it is possible to obtain a packaging 1 that is not slippery, is resistant to dirt adhesion, and has a good shape after packaging.

[0022] Furthermore, the pulping and bleaching methods used in pulp production are not particularly limited.

[0023] Furthermore, various commonly used additives, such as wet strength enhancers, fillers, sizing agents, dry strength enhancers, yield enhancers, and coloring pigments, may be added to the paper substrate in appropriate amounts as needed.

[0024] The wet paper strength improver can be selected and used from known ones that are 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 becomes difficult to obtain an effect commensurate with the blending amount, resulting in a cost increase, and also a decrease in the disintegration property, and it may be difficult to reuse the packaging body 1 of the present invention later. Also, if 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 is likely to break when wet with water, and it may be inferior in the function as the packaging body 1.

[0025] In the packaging body 1 of the present invention, these raw materials can be formed into a paper base material of the packaging base material 10 by a normal papermaking process.

[0026] (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 the other layers include a heat-sealing layer, a water vapor barrier layer, an oxygen barrier layer, a printing layer, a printing suitability improvement layer, an overprint layer, a light-shielding layer, etc. These other layers can be provided, for example, on the surface side or the back side of the paper base material, and may be one layer or two or more layers.

[0027] Also, it is preferable to apply a varnish to the surface of the packaging base material 10 for adjusting the coefficient of kinetic friction and preventing the adhesion of dirt, and the coating amount of the varnish is 0.5 g / m 2 or more and 8.0 g / m 2 or less, preferably 1.0 g / m 2 or more and 6.0 g / m 2 or less, more preferably 2.0 g / m 2 or more and 4.5 g / m 2 or less. If the coating amount is 0.5 g / m 2If the amount is less than 8.0 g / m², the packaging substrate 10 will not be slippery and dirt will easily adhere to the packaging substrate 10. 2 If this value is exceeded, the packaging material 10 becomes too slippery, causing the packaged body 1 to slip easily, resulting in poor transportability when transporting the packaged body 1 on a conveyor.

[0028] (3) Physical properties of the entire packaging material The basis weight of packaging material 10 is 40 g / m². 2 More than 105g / m 2 Preferably, it is 50 g / m 2 More than 90g / m 2 More preferably, the following is true: 60 g / m 2 More than 80g / m 2 It is even more preferable that the basis weight is 40 g / m². 2 If the basis weight is less than 105 g / m², the strength of the packaging base material 10 is too low, causing it to bend in places other than the designated position during packaging, resulting in an inferior shape after packaging. 2 If the basis weight exceeds this value, the strength of the packaging material 10 becomes too high, making it difficult to bend at the desired position during packaging, resulting in a poor shape after packaging. By keeping the basis weight of the packaging material 10 within the above numerical range, the packaging material 10 can be easily bent at the desired position, and a package 1 with a good shape after packaging can be obtained. The basis weight of the packaging material 10 can be measured in accordance with JIS P 8124.

[0029] Furthermore, the dynamic friction coefficient of the packaging substrate 10 is preferably 0.12 or more and 0.46 or less, more preferably 0.14 or more and 0.36 or less, and more preferably 0.16 or more and 0.25 or less. If the dynamic friction coefficient is less than 0.12, the packaging substrate 10 will slide too much, making the packaged body 1 prone to slipping, resulting in poor transportability when transporting the packaged body 1 on a conveyor. If the dynamic friction coefficient exceeds 0.46, the packaging substrate 10 will not slide enough, resulting in dirt easily adhering to the packaging substrate 10. In this case, the coefficient of dynamic friction is the coefficient of dynamic friction between the surfaces of the packaging substrate 10 (the surface that comes into contact with the consumer's hand, i.e., the surface opposite to the surface that comes into contact with the toilet roll 11), and the measurement is performed in accordance with ISO 15359. Measurements are taken three times for each sample, but the data from the third measurement is adopted. For one type of sample, the values ​​are averaged from five measurements of the MD direction (Machine Direction, the conveying direction in the manufacturing line) and five measurements of the CD direction (Cross Direction, the direction perpendicular to the MD direction) of the packaging substrate 10 (the data from the third measurement out of three is adopted and counted as one measurement, for a total of five measurements). The values ​​are averaged from five measurements of the MD direction and five measurements of the CD direction (the data from the third measurement out of three measurements in each direction is adopted and counted as one measurement for that direction, for a total of 10 measurements of the MD direction and 5 measurements in the CD direction).

[0030] Furthermore, the Wang-Ren smoothness of the packaging substrate 10 is preferably 7 seconds or more and 55 seconds or less, more preferably 11 seconds or more and 38 seconds or less, and even more preferably 12 seconds or more and 30 seconds or less. If the Wang-Ren smoothness is less than 7 seconds, the smoothness of the packaging substrate 10 is low, and as a result, dirt easily adheres to the packaging substrate 10. If the Wang-Ren smoothness exceeds 55 seconds, the smoothness of the packaging substrate 10 is too high, making the package 1 slippery, and the transportability when transporting the package 1 on a conveyor is poor. In this case, the Wang Ken smoothness is the Wang Ken smoothness of the surface of the packaging substrate 10 (the surface that comes into contact with the consumer's hand, i.e., the surface opposite to the surface that comes into contact with the toilet roll 11), and the measurement is performed in accordance with JIS P 8155.

[0031] As will be described later, there are various packaging forms for the packaging body 1 according to the present invention, including cases where the toilet roll 11 is wrapped from the MD direction and cases where the toilet roll 11 is wrapped from the CD direction. When the toilet roll 11 is wrapped 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 6.5 kN / m or less, and even 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 strength of the packaging base material 10 is too low, causing it to bend at a position other than the predetermined position during packaging, resulting in a poor shape after packaging. If the tensile strength in the MD direction exceeds 7.5 kN / m, the strength of the packaging base material 10 is too high, making it difficult to bend at the predetermined 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 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 even 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 strength of the packaging base material 10 is too low, causing it to bend in places other than the intended position during packaging, resulting in a poor shape after packaging. If the tensile strength in the CD direction exceeds 5.0 kN / m, the strength of the packaging base material 10 is too high, making it difficult to bend in the intended position during packaging, resulting in a poor shape after packaging. By keeping the tensile strength of the packaging substrate 10 in the MD and CD directions within the above range, a package 1 can be obtained that maintains a good shape after packaging and is less prone to dirt adhering to the packaging substrate. The tensile strength of the packaging substrate 10 can be measured in accordance with JIS P 8113.

[0033] The bursting strength of the packaging material 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 strength of the packaging material 10 is too low, causing it to bend in places other than the intended position during packaging, resulting in a poor shape after packaging. If the bursting strength exceeds 430 kPa, the strength of the packaging material 10 is too high, making it difficult to bend in the intended position during packaging, resulting in a poor shape after packaging. By setting the bursting strength of the packaging material 10 within the above range, a package 1 can be obtained that has a good shape after packaging and is less prone to dirt adhering to the packaging material. The bursting strength of the packaging substrate 10 can be measured in accordance with JIS P 8112.

[0034] When wrapping the toilet roll 11 from the MD direction, the bending stiffness of the packaging base material 10 in the MD direction is preferably 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 even more preferably 200 μN·m or more and 550 μN·m or less. If the bending stiffness in the MD direction is less than 60 μN·m, the strength of the packaging base material 10 is too low, causing it to bend in places other than the intended position during packaging, resulting in a poor shape after packaging. If the bending stiffness in the MD direction exceeds 900 μN·m, the strength of the packaging base material 10 is too high, making it difficult to bend in the intended position during packaging, resulting in a poor shape after packaging.

[0035] When wrapping a 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 400 μN·m or less, more preferably 40 μN·m or more and 300 μN·m or less, and even more preferably 80 μN·m or more and 250 μN·m or less. If the bending stiffness in the CD direction is less than 30 μN·m, the strength of the packaging base material 10 is too low, causing it to bend in places other than the intended position during packaging, resulting in a poor shape after packaging. If the bending stiffness in the CD direction exceeds 400 μN·m, the strength of the packaging base material 10 is too high, making it difficult to bend in the intended position 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, a package 1 can be obtained that has a good shape after packaging and is less prone to dirt adhering to the packaging substrate. In addition, the required flexibility and softness of the packaging substrate 10 can be more easily achieved. The bending stiffness of the packaging material 10 can be measured in accordance with ISO 2493. Note that bending stiffness is strongest when a load is applied in the direction of the long axis of the fiber; therefore, when the fiber orientation ratio is close to 1.0, the bending stiffness in the MD direction tends to be small (low), and the bending stiffness in the CD direction tends to be large (high).

[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 packaging substrate 10 is too thin and will bend in places other than the predetermined position during packaging, resulting in a poor shape after packaging. If the thickness exceeds 160 μm, the packaging substrate 10 is too thick and will not bend in the predetermined position during packaging, resulting in a poor shape after packaging. By setting the thickness of the packaging substrate 10 within the above range, a package 1 can be obtained that has a good shape after packaging and is less prone to dirt adhering to the packaging substrate. The thickness of the packaging substrate 10 can be measured in accordance with JIS P 8118:1998. The pressure condition on the pressurized surface is 100 kPa.

[0037] The density of the packaging material 10 is 0.50 g / cm³. 3 More than 0.85g / cm 3 Preferably, it is 0.55 g / cm³. 3 More than 0.80g / cm 3 It is more preferable that the following is the case: 0.60 g / cm³ 3 More than 0.75g / cm 3 It is even more preferable that the density is 0.50 g / cm³. 3 If the density is less than 0.85 g / cm³, the strength of the packaging material 10 is too low, causing it to bend in places other than the designated position during packaging, resulting in a poor shape after packaging. 3If the strength exceeds a certain limit, the packaging material 10 becomes too strong, making it difficult to bend at the desired position during packaging, resulting in an inferior shape after packaging. By ensuring the density of the packaging material 10 is within the above range, a package 1 can be obtained that maintains a good shape after packaging and is resistant to dirt adhesion to the packaging material. Furthermore, the required strength, flexibility, and softness of the packaging material 10 can be easily achieved. The density of the packaging material 10 can be measured and calculated in accordance with JIS P 8118:1998.

[0038] 3. Toilet roll Figure 2 is a perspective view showing an example of the arrangement of toilet rolls 11 to be packaged in the packaging body 1 of the present invention. The packaging body 1 of the present invention packages 2, 4, or 6 toilet rolls 11. If the number of rolls exceeds 6, the size of the packaging body 1 increases, making it difficult for the packaging material 10 to bend at a predetermined position during packaging, resulting in a poorer shape after packaging. In addition, the packaging body 1 becomes heavier, and the packaging material 10 becomes more prone to tearing.

[0039] Furthermore, the toilet rolls 11 are arranged in one, two, or three rows perpendicular to their axial direction L, and in the case of two or three rows, the ends of each row are aligned. However, the arrangement is preferably one of those shown in Figures 2(a) to (e), more preferably the arrangement in Figure 2(c) or (d), and even more preferably the arrangement in Figure 2(c). If the number of rows of rolls (number of rolls in the horizontal direction) exceeds three rows (three rolls), the size of the packaging 1 increases horizontally, making it difficult for the packaging material 10 to bend at a predetermined position during packaging, resulting in a poorer appearance after packaging. If the number of stacked rolls (number of rolls in the vertical direction) exceeds three, the size of the packaging 1 increases vertically, making it difficult for the packaging material 10 to bend at a predetermined position during packaging, resulting in a poorer appearance after packaging. Note that the ends of each row may be offset by a few millimeters due to variations in the roll width of each toilet roll 11.

[0040] The number of plies in the toilet roll 11 is not particularly limited, but it is preferably 1 ply or 2 plies, and more preferably 2 plies. The length of the toilet roll 11 is preferably 35m to 103m, more preferably 40m to 95m, and even more preferably 55m to 85m, in the case of a 2-ply toilet roll. In the case of a 1-ply toilet roll, it is preferably 80m to 203m, more preferably 100m to 185m, and even more preferably 120m to 173m. If the length is less than 35m in the case of a 2-ply toilet roll, or less than 80m in the case of a 1-ply toilet roll, when the roll diameter described later is set to a constant roll diameter, the packaging material 10 will not bend at a predetermined position during packaging, resulting in an inferior shape after packaging. If the length exceeds 103m in the case of a 2-ply toilet roll, or more than 203m in the case of a 1-ply toilet roll, when the roll diameter described later is set to a constant roll diameter, the roll weight and roll density will increase, resulting in a heavier package 1 that rubs against the conveyor and is more prone to dirt adhering to the packaging material 10.

[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 a constant roll length and basis weight are maintained, resulting in a heavier package 1 that rubs against the conveyor and makes it easier for dirt to adhere to the packaging material 10. If it exceeds 140 mm, the roll density will be low when a constant roll length and basis weight are maintained, making it difficult for the packaging material 10 to bend at a predetermined position during packaging, resulting in an inferior shape after packaging. By setting the length and diameter of the toilet roll 11 within the above range, it becomes easier to adjust to a predetermined roll density. Furthermore, when packaging the toilet roll 11 with the packaging base material 10, the packaging base material 10 becomes less prone to tearing, bends easily at predetermined positions during packaging, and a packaged body 1 is obtained that has an excellent shape after packaging and is less likely to accumulate dirt on the packaging base material.

[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, when a certain roll diameter, roll length and basis weight are maintained, the roll density becomes low, making it difficult for the packaging material 10 to bend at the predetermined position during packaging, resulting in a poor shape after packaging. If it exceeds 55 mm, when a certain roll diameter, roll length and basis weight are maintained, the roll density becomes high, resulting in the package 1 becoming heavier, rubbing against the conveyor, and dirt easily adhering to the packaging material 10.

[0043] Furthermore, the basis weight per ply of toilet roll 11 is 12g / m² for a 2-ply roll. 2 More than 18g / m 2 Preferably, it is 13 g / m 2 More than 17g / m 2 It is more preferable that the following conditions apply: 14 g / m 2 More than 16g / m 2 It is even more preferable that the following conditions be met: 13g / m² for a single ply. 2 More than 22g / m 2 Preferably, it is 14 g / m 2 More than 20g / m 2 More preferably, the following is true: 15 g / m 2 More than 18g / m 2 It is even more preferable that the following conditions be met: 12g / m² for 2-ply. 2 Less than 13g / m² in the case of 1 ply 2 If the density is less than 18 g / m², the roll density will be low when maintaining a constant roll diameter and length, making it difficult for the packaging material 10 to bend at the desired position during packaging, resulting in a poor shape after packaging. 2 If it exceeds 22g / m² in the case of a single ply, or if it is 22g / m² 2 If it exceeds a certain limit, the roll density increases when maintaining a constant roll diameter and length. As a result, the package 1 becomes heavier, rubs against the conveyor, and dirt is more likely to adhere to the packaging material 10.

[0044] Furthermore, the weight per 114 mm of roll width in a toilet roll 11 including the core is preferably between 120 g and 380 g, more preferably between 140 g and 340 g, and more preferably between 190 g and 315 g. Also, the weight per 114 mm of roll width in a toilet roll 11 excluding the core is preferably between 115 g and 375 g, more preferably between 135 g and 335 g, and even more preferably between 185 g and 310 g. If the weight including the core is less than 120 g, or the weight excluding the core is less than 115 g, the roll density will be low when a constant winding diameter is maintained, making it difficult for the packaging material 10 to bend at a predetermined position during packaging, resulting in a poor shape after packaging. If the weight including the core exceeds 380 g, or the weight excluding the core exceeds 375 g, the resulting package 1 becomes heavier, rubs against the conveyor, and dirt is more likely to adhere to the packaging material 10.

[0045] Furthermore, the weight of the core (paper tube) of the toilet roll 11 is preferably 3.0g or more and 7.0g or less, more preferably 3.5g or more and 6.0g or less, and even more preferably 3.9g or more and 5.0g or less. If the weight of the core is less than 3.0g, the roll density will be low when a constant roll diameter is maintained, making it difficult for the packaging material 10 to bend at the predetermined position during packaging, resulting in a poor shape after packaging. If the weight of the core exceeds 7.0g, the resulting package 1 becomes heavier, causing it to rub against the conveyor and making it easier for dirt to adhere to the packaging material 10. By setting the outer diameter, basis weight, and respective weights of the toilet roll core 11 within the above ranges, it becomes easier to adjust to a predetermined roll density. Furthermore, when packaging the toilet roll 11 with the packaging base material 10, the packaging base material 10 becomes less prone to tearing, bends easily at predetermined positions during packaging, and a packaged body 1 is obtained that has excellent shape after packaging and is less susceptible to dirt adhering to the packaging base material.

[0046] Furthermore, the roll density of toilet roll 11 is 0.10 g / cm³. 3 More than 0.34g / cm 3 The following is the value: 0.12 g / cm³ 3 More than 0.31g / cm 3Preferably, it is 0.18 g / cm³. 3 More than 0.27g / cm 3 The following is more preferable: Roll density is 0.10 g / cm³ 3 If the roll density is less than 0.34 g / cm³, the packaging base material 10 will not bend easily at the desired position during packaging, resulting in a poor shape after packaging. 3 If the density exceeds this limit, the package 1 becomes heavier and rubs against the conveyor, making it easier for dirt to adhere to the packaging base material 10. By keeping the roll density of the toilet roll 11 within the above range, the packaging base material 10 becomes less likely to tear, and it becomes easier to bend at a predetermined position during packaging, resulting in a package 1 with excellent shape after packaging and less likelihood of dirt adhering to the packaging base material.

[0047] The roll density is calculated by multiplying the bottom area of ​​a single toilet roll 11 (excluding the core) by the roll width (height) (i.e., the volume of a single toilet roll 11 excluding the core), and then dividing the mass of a single toilet roll 11 excluding the core by this volume. For example, if the roll weight (excluding core) per 114mm roll width is 201g, the roll diameter is 130mm, and the core outer diameter is 39mm, then the roll density = 201g ÷ [{3.14 × (130mm ÷ 2 ÷ 10) 2 -3.14 × (39mm ÷ 2 ÷ 10) 2} × (114 mm ÷ 10) = 0.15 g / cm 3 This is the result. At this time, the roll density measurement is performed after holding the rolls in equilibrium under the temperature and humidity conditions specified in JIS P 8111 (23±1℃, 50±2%RH).

[0048] Furthermore, the paper thickness of 10 sheets of toilet paper used in the toilet roll 11 (10 sheets in the case of 1-ply, or 10 sheets from 5 sets in the case of 2-ply) 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. The paper thickness is measured using a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measuring load of 3.7 kPa and a probe diameter of 30 mm. The sample is placed between the probe and the measuring stand, and the gauge is read when the probe is lowered at a speed of 1 mm or less per second. The measurement is repeated 10 times, and the results are averaged.

[0049] 4.Packaging format Caramel packaging is preferred as the packaging form for the packaging body 1 according to the present invention.

[0050] Caramel packaging is a type of packaging in which a packaging base material extending along one direction of the packaged object is wrapped around the object in a direction parallel to or intersecting this direction, or the object is inserted from one end in the axial direction of a pre-formed cylindrical packaging base material, and the sides of the packaging are bonded together. Then, two opposing flap-shaped edges of the packaging base material protruding from both ends of the packaged object are folded together, then two other opposing flap-shaped edges are folded together in the same way, and these folded portions are sealed with an adhesive such as glue. This caramel packaging can be performed using known equipment. In Figure 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. Hot melt adhesive is preferred as the adhesive to be used.

[0051] In one embodiment, for example, when using a packaging base material 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 when, for example, the packaging base material 10 is conveyed in the form of a continuous sheet, the toilet roll 11 is placed, the toilet roll 11 is wrapped and packaged from the conveying direction (manufacturing line direction; MD direction), and the packaging body is cut to a predetermined size from the width direction (CD direction) perpendicular 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. When the wrapping direction is the MD direction, the packaging base material 10 bends appropriately in the width direction (CD direction), making it easier to package when folding and bonding the flaps at the top and bottom. In this case, it is preferable to select caramel packaging as the packaging type for the packaging body 1 of the present invention. Note that the toilet roll 11 may be placed after the packaging base material 10 has been cut to a predetermined size, or the packaging base material 10 may be cut to a predetermined size after the toilet roll 11 has been placed.

[0052] In another embodiment, for example, when using a packaging base material 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 when, for example, the packaging base material 10 is conveyed in the form of a continuous sheet, the toilet roll 11 is placed, and then the toilet roll 11 is wrapped and packaged from the width direction (CD direction) perpendicular to the conveying direction (manufacturing line direction; MD direction), that is, when the wrapping direction is the CD direction of the packaging base material 10. When the wrapping direction is the CD direction of the packaging base material 10, the packaging base material 10 becomes more flexible in the wrapping direction, making it easier to package. In this case as well, the toilet roll 11 may be placed after the packaging base material 10 has been cut to a predetermined size, or the packaging base material 10 may be cut to a predetermined size after the toilet roll 11 has been placed.

[0053] 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 obvious to those skilled in the art that various modifications or improvements can be made to the above embodiments. Furthermore, it is clear from the claims that such modified or improved forms may also be included within the technical scope of the present invention. [Examples]

[0054] The present invention will be described in detail below with reference to examples. However, the present invention is not limited in any way to the examples shown below.

[0055] In the examples and comparative examples, the physical properties of the prepared packaging substrates were measured by the following method.

[0056] (Basis weight of packaging material) The basis weight of the packaging material was measured in accordance with JIS P 8124.

[0057] (Thickness of packaging material) The thickness of the packaging substrate was measured in accordance with JIS P 8118:1998, using an automatic lifting paper thickness gauge standard model TM-600 (manufactured by Kumagai Riki Kogyo Co., Ltd.). The pressure condition on the pressurized surface was 100 kPa.

[0058] (Density of packaging material) The density of the packaging material was measured and calculated in accordance with JIS P 8118:1998.

[0059] (Tensile strength of the packaging substrate in the MD and CD directions) The tensile strength of the packaging substrate in the MD and CD directions was measured in accordance with JIS P 8113.

[0060] (Measurement of bending stiffness of packaging substrate in the MD and CD directions) The bending stiffness of the packaging substrate in the MD and CD directions was measured using an L&W bending tester (Lorentzen & Wettre) in accordance with the method described in ISO 2493. For a test specimen of the packaging substrate with a width of 38 mm and a length of 100 mm, the measured value was taken as the bending resistance (load) when the bending angle was 15 degrees and the bending length (span of the sample stage) was 10 mm, and 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 test specimen with a length of 100 mm, the length of the test specimen may be shortened. Also, the test specimen should not include perforations, however, if it is necessary to include perforations in order to ensure the size of the test specimen, then perforations may be included.

[0061] (Coefficient of dynamic friction of packaging material) The coefficient of dynamic friction of the packaging substrate was measured in accordance with ISO 15359, by measuring the coefficient of dynamic friction between the surfaces of the packaging substrate (the surface that comes into contact with the consumer's hand, i.e., the surface opposite to the surface that comes into contact with the toilet roll). Measurements were taken three times for each sample, and the data from the third measurement was used. For each measurement, five measurements were taken in both the MD direction (Machine Direction, the direction of transport on the manufacturing line) and the CD direction (Cross Direction, the direction perpendicular to the MD direction) of the packaging substrate (the third measurement from each of the three measurements was used and counted as one measurement, for a total of five measurements). The average of these 10 values ​​(the third measurement from each of the three measurements in each direction was used and counted as one measurement for that direction, for a total of 10 measurements: 5 in the MD direction and 5 in the CD direction) was used.

[0062] (Oken-style smoothness of packaging substrates) The smoothness of the packaging substrate was measured according to the Wangyan method, in accordance with JIS P 8155. The measurement was performed on the surface.

[0063] (Burst strength of packaging material) The bursting strength of the packaging material was measured in accordance with JIS P 8112. Specifically, a Muhlene bursting strength tester manufactured by Kumagai Riki Kogyo Co., Ltd. was used, and the measurement was performed under low-pressure conditions.

[0064] <Example 1> (Packaging base material) A paper substrate (kraft paper) was prepared using 100% by weight of unbleached softwood kraft pulp (NUKP) as the pulp raw material, and this was used as the packaging substrate. The basis weight, thickness, density, tensile strength in the MD and CD directions, bending stiffness in the MD and CD directions, coefficient of dynamic friction, Wang Ken smoothness, and burst strength of the packaging substrate were measured and the results are shown in Table 1. In addition, after measuring each parameter, varnish was applied to the surface in the amounts shown in Table 1.

[0065] (Toilet roll) In addition, four toilet rolls were prepared with the following specifications: roll length, roll diameter, number of plies, core outer diameter, basis weight per ply, weight including / excluding the core per 114 mm roll width, core weight, and roll density, as shown in Table 1.

[0066] (Toilet roll packaging (caramel-style packaging)) Using the prepared packaging material, a packaging body was created with dimensions of 650 mm in the MD direction and 420 mm in the CD direction of the packaging material. Four toilet rolls (2 vertically x 2 horizontally) were then placed inside this packaging body and sealed using caramel wrapping to obtain a toilet roll package. The packaging method involved wrapping the toilet rolls from the MD direction.

[0067] (Form after packaging) The toilet roll packaging we created was evaluated by 30 monitors based on the visual appearance (aesthetic appeal) of the packaging. The evaluation criteria were as follows: 5: 0-1 people felt that the packaging material was sagging or not bent in the designated position, resulting in poor aesthetics, indicating that the aesthetics were significantly good. 4. Two to three people felt that the packaging material was sagging or not bent in the designated position, resulting in poor aesthetics, while the overall aesthetics were good. 3. Four to five people felt that the packaging material was loose or not bent in the designated position, resulting in poor aesthetics, but overall the aesthetics were good. 2: Six to seven people felt that the packaging material was sagging or not bent in the designated position, resulting in poor aesthetic appeal. 1: 8 to 30 people felt that the packaging material was sagging or not bent in the designated position, resulting in a significantly inferior appearance.

[0068] (Resistance to dirt adhering to the packaging material) The toilet roll packaging we manufactured was subjected to friction with the conveyor belt during the packing process on the manufacturing line. Thirty monitors evaluated how easily dirt adhered to the packaging material during this friction. The evaluation criteria were as follows: 5: 0-1 people felt that the packaging material was prone to dirt adhesion, indicating significantly better resistance to dirt adhesion. 4. Two to three people felt that the packaging material was prone to dirt adhesion, indicating that its resistance to dirt adhesion was good. 3. Four to five people felt that the packaging material was prone to dirt adhesion, but overall, the resistance to dirt adhesion was good. 2: Six to seven people felt that the packaging material was prone to dirt adhesion, indicating that it was inferior in terms of dirt resistance. 1: 8 to 30 people felt that the packaging material was prone to dirt adhesion, indicating that its resistance to dirt adhesion was significantly inferior.

[0069] (Conveyor-like transportability) The manufactured toilet roll packaging was evaluated by 30 monitors on its transportability on the manufacturing line's conveyor belt, similar to the dirt-repellency evaluation mentioned above. The evaluation criteria were as follows: 5: 0-1 people found it too slippery and difficult to transport, indicating significantly good transportability. 4. Two to three people found it too slippery and difficult to transport, but overall, the transportability was good. 3. Four to five people found it too slippery and difficult to transport, but overall, the transportability was good. 2: Six to seven people felt it was too slippery and difficult to transport, indicating poor transportability. 1: 8 to 30 people felt that it was too slippery and difficult to transport, indicating significantly poor transportability.

[0070] <Examples 2> to <Examples 24>, <Comparative Example 1> to <Comparative Example 6> Examples 2-24 and Comparative Examples 1-6 were prepared in the same manner as in Example 1, with packaging substrates having the physical properties shown in Tables 1-3. Using these substrates, toilet roll packaging (caramel packaging) was prepared in the same manner as in Example 1, and the post-packaging form, resistance to dirt adhesion to the packaging substrate, and conveyability on a conveyor were evaluated. The results are shown in Tables 1 to 3.

[0071] [Table 1]

[0072] [Table 2]

[0073] [Table 3]

[0074] As is clear from the results shown in Tables 1-3, the packaging materials of Examples 1-24 all exhibited excellent post-packaging form, were resistant to soiling of the packaging substrate, and had excellent conveyability on conveyors. In contrast, Comparative Examples 1-6 all exhibited inferior post-packaging form, were prone to soiling of the packaging substrate, or had poor conveyability on conveyors. Therefore, the present invention provides a toilet roll packaging that, even when toilet rolls are packaged with a packaging material including a paper base, maintains a good shape after packaging, is less prone to dirt adhering to the packaging material, and has good transportability. [Explanation of Symbols]

[0075] 1 package 10 Packaging base material 11 Toilet rolls h Height direction of packaging 1 L Toilet roll 11 axial direction P Circumferential direction of the packaging substrate 10

Claims

1. A packaging body comprising a packaging material containing at least a paper base, in which two, four, or six toilet rolls are packaged, The roll density of the aforementioned toilet roll is 0.10 g / cm³. ３ 0.34g / cm or more ３ Below, the weight per 114 mm of roll width in one roll, including the core, is between 120 g and 380 g. The toilet rolls are arranged in one, two, or three rows perpendicular to their axial direction, and in the case of two or three rows, the ends of each row are aligned. The surface of the packaging substrate is coated with varnish, and the amount of varnish applied is 0.5 g / m² to 8.0 g / m². The coefficient of dynamic friction of the packaging substrate is 0.12 or more and 0.46 or less. The Wangyan smoothness of the aforementioned packaging substrate is 7 seconds or more and 55 seconds or less. A toilet roll packaging characterized in that the packaging is caramel-wrapped.

2. The basis weight of the aforementioned packaging material is 40 g / m². ２ 105g / m or more ２ The toilet roll packaging according to claim 1, characterized in that it is as follows.

3. A method for manufacturing a toilet roll packaging according to claim 1, A method for manufacturing a toilet roll package, characterized in that the direction in which the toilet roll is wrapped with the packaging material is the MD direction of the packaging material.

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