TW202408882A - Roll package - Google Patents

Abstract

This roll package is obtained by a plurality of sanitary tissue rolls being directly packaged by a paper sheet, wherein: the basis weight of the paper sheet is 35 g/m2 to 100 g/m2; the thickness of the paper sheet is 48-180 [mu]m; and the in-plane PPS smoothness contacting the sanitary tissue rolls of the paper sheet is 4 seconds or less.

Description

Roll packaging

The present invention relates to a roll packaging body.

Toilet tissue such as toilet paper is distributed as a plurality of roll products in a state of being contained in a packaging bag made of a resin film (for example, Patent Document 1). A roll package made of such sanitary tissue rolls is wrapped in a resin film, and is transported and stored in a state of being packaged in multiple layers with corrugated boxes, kraft paper, etc., and these packages are unpacked at the time of sale. and displayed in a store (for example, Patent Document 2).

In recent years, attention has been paid to the trend of not using resin films from the viewpoint of reducing CO ₂ emissions and plastic weight reduction. In addition, from the perspective of Sustainable Development Goals (SDGs), we seek to reduce excessive packaging of products.

[Prior technical literature] (Patent literature) Patent literature 1: Japanese Patent Publication No. 2017-124868 Patent literature 2: Japanese Patent Publication No. 2021-147094

[Problem to be solved by the invention] The resin film used to package sanitary tissue rolls is used as a handle for transportation or as a packaging material for temporary storage. However, it is eventually discarded, so it is desired to reduce its usage. Furthermore, when a sanitary tissue roll is packaged with a resin film and packaged in multiple layers using corrugated cardboard boxes, kraft paper, or the like, it may become excessive packaging. On the other hand, if the sanitary tissue roll is directly packaged with paper such as kraft paper, fluffing, paper dust, etc. of the roll may occur.

The problem to be solved by the present invention is to provide a roll packaging body which does not use a resin film in the packaging of a sanitary tissue roll, thereby avoiding overpackaging and inhibiting the generation of fuzz and paper dust of the sanitary tissue roll.

[Technical Means for Solving the Problem] One aspect of the present invention is a roll packaging body in which a plurality of sanitary tissue rolls are directly packaged with paper sheets, wherein the basis weight of the paper sheets is 35g/ m ² or more and 100 g/m ² , the thickness of the paper sheet is 48 μm or more and 180 μm or less, and the PPS smoothness of the inner surface of the paper sheet in contact with the sanitary tissue roll is 4 seconds or less.

[Effects of the invention] According to one aspect of the present invention, it is possible to provide a roll packaging body that does not use a resin film and can avoid excessive packaging and suppress the occurrence of fluffing and paper powder of the sanitary tissue roll.

The implementation method of the present invention is described in detail with reference to the drawings. In each figure, common parts may be marked with the same symbols and the description may be omitted. In each figure, the proportions of each component may be different from the actual ones. In addition, in each figure, a three-dimensional orthogonal coordinate system of three-axis directions (X direction, Y direction, Z direction) is used, and the long side direction (left-right direction) of the roll packaging body is set as the X direction, the width direction (front-back direction) is set as the Y direction, and the height direction (up-down direction or thickness direction) is set as the Z direction.

Fig. 1 shows an example of a roll packaging body of the present embodiment. Fig. 2 shows a sanitary tissue roll constituting the roll packaging body of Fig. 1. Fig. 3 is a cross-sectional view taken along line A-A of Fig. 1, and Fig. 4 is a cross-sectional view taken along line B-B of Fig. 1.

The roll package 100 is formed by directly packaging a plurality of sanitary tissue rolls 10 with paper sheets 20. Here, the term "directly packaged" means that the sanitary tissue rolls 10 are directly packaged with paper sheets without any other member such as a resin film between the sanitary tissue rolls 10 and the paper sheets 20.

The packaging form of the roll packaging body 100 is not limited. For example, as shown in FIG1 , the sanitary tissue roll 10 can be packaged in a toffee type with a paper sheet 20. In this example, the roll packaging body 100, when the sanitary tissue roll 10 is packaged with the paper sheet 20, has a top surface 21, a bottom surface 22, a front surface 23, a back surface 24, a side surface (left side) 25, and a side surface (right side) 26.

Furthermore, the side surfaces 25 and 26 of the roll packaging body 100 are respectively sealed. For example, the side surfaces 25 and 26 are adhered and sealed by an adhesive when a part of the paper sheet 20 is folded. In addition, the left side 25 and the right side 26 may be sealed by affixing an adhesive tape to a part of the folded paper 20 .

The sanitary tissue roll 10 is formed by rolling a sanitary tissue roll into a roll shape (hereinafter, sometimes referred to as a roll body or a roll). In this embodiment, a toilet paper roll body, that is, a toilet paper roll is used as an example of the sanitary tissue roll 10.

In addition, the form of the sanitary tissue paper constituting the roll is not limited to toilet paper, and may also be applied to kitchen paper, paper towels, facial tissue, etc., for example. The use of sanitary tissue paper is not particularly limited, and it can be applied to any use such as industrial use, household use, or portable use.

As shown in FIG. 2 , the sanitary tissue roll 10 is made by rolling (winding) long sanitary tissue paper (toilet paper in this embodiment) 12 into a roll around a hollow core 11 . The sanitary tissue roll (toilet paper roll) 10 has a pair of end surfaces 10A and 10B and a peripheral surface 10C. One longitudinal end 12A of the sanitary tissue paper 12 constituting the roll 10 is exposed on the peripheral surface 10C of the roll 10, and the other longitudinal end (not shown) is bonded to the hollow core 11.

The size of the sanitary tissue roll 10 is not particularly limited, and its vertical dimension (Z direction) (roll width) is preferably 85 mm or more and 300 mm or less, and its horizontal dimension (X direction or Y direction) (roll diameter) is preferably 80 mm or more and 125 mm or less (see FIG. 2 ).

The width of the sanitary tissue paper 12 constituting the sanitary tissue roll 10 is 85 mm or more and 300 mm or less. In addition, the sanitary tissue paper 12 is a sanitary tissue paper with a winding length of 20 m or more and 120 m or less, and a winding density of 0.50 m/cm ² or more and 2.05 m/cm ² or less, including a winding length of 50 m or more and a winding density It is sanitary tissue paper with long roll specifications of 0.80m/ ^cm2 or more.

The number of plies of the sanitary tissue paper 12 is not particularly limited, and can be one or more plies, preferably one or two plies (two sheets stacked).

The material of the sanitary tissue 12 is not particularly limited, and for example, paper, nonwoven fabric, or cloth can be used. In addition, the sanitary tissue 12 uses base paper with pulp as the main raw material. The pulp composition can use a known composition in sanitary tissue. For example, the mixing ratio of the pulp can be set to 50 mass% or more, preferably 90 mass% or more, and more preferably 100 mass%.

In addition, the pulp composition in the sanitary tissue paper 12 is not particularly limited. For example, softwood pulps such as NBKP (coniferous tree pulp) and NUKP (coniferous unbleached pulp), and broadleaf tree pulps such as LBKP (hardwood tree kraft pulp) and LUKP (hardwood unbleached pulp) can be used in any ratio.

In the pulp composition of the sanitary tissue 12, the ratio of broadleaf pulp to coniferous pulp is not limited, but is preferably 10:90 to 80:20, and more preferably a pulp composition in which the ratio of coniferous pulp to broadleaf pulp is higher. In addition, the pulp contained in the sanitary tissue 12 may also be recycled pulp.

The basis weight (mass per square meter) of the sanitary tissue paper 12 is not particularly limited. Depending on the number of layers, in the case of paper, it is 5 g/m ² or more and 80 g/m ² or less, and preferably it is 10 g/m 2 or more and 60 g/m ² or more. m ² or less, more preferably 10 g/m ² or more and 45 g/m ² or less. Moreover, in the case of nonwoven fabric, it is preferable that it is 20 g/m ² or more and 100 g/m ² or less. In addition, basis weight (mass per square meter) indicates the mass per unit area of paper measured in accordance with the provisions of Japanese Industrial Standard JIS P 8124:2011.

The thickness (paper thickness) of the sanitary tissue 12 is not particularly limited, and refers to the paper thickness measured in accordance with the provisions of Japanese Industrial Standard JIS P 8118: 1998. For example, when the sanitary tissue 12 is paper, each layer is 50 μm or more and 200 μm or less, preferably 60 μm or more and 150 μm or less, and more preferably 70 μm or more and 135 μm or less.

In addition, the sanitary tissue paper 12 may be embossed. This embossing process can be performed by a conventional embossing method.

Furthermore, the hollow core 11 is a cylindrical winding core in which the sanitary tissue 12 is wound in the circumferential direction (R direction) (see FIG. 2 ). Furthermore, the hollow core 11 also includes a structure in which there is no winding core (coreless structure). The material of the hollow core 11 is not particularly limited, and paper, resin, etc. can be used.

The shape of the hollow core 11 is not particularly limited. For example, if the hollow core 11 is a paper tube, it may be made of one layer of thick paper, or it may be any paper tube made of multiple layers of thick paper, or it may be made in advance. Coated thick paper base paper for printing on thick paper and applying deodorant. In addition, the winding method of the paper tube is not particularly limited, and for example, it may be any of a flat paper tube, a spirally wound paper tube (so-called skew-wound paper tube), and the like.

The size of the hollow core 11 is not particularly limited. For example, the length of the hollow core 11 in the longitudinal direction is approximately the same as the roll width of the sanitary tissue roll 10 (85 mm or more and 300 mm or less). In addition, the diameter size of the hollow core 11 in the diameter direction (X direction or Y direction) is 33 mm or more and 50 mm or less, preferably 35 mm or more and 41 mm or less (see FIG. 2 ).

The number of sanitary tissue rolls 10 that can be packed in the roll packaging body 100 is not limited. For example, when the sanitary tissue roll 10 is a toilet paper roll, it can accommodate 2 or more and 64 or less toilet paper rolls. The number of reels is preferably from 4 to 32, and more preferably from 8 to 24.

In this embodiment, in the roll packaging body 100, the packaging form of a plurality of sanitary tissue rolls is not limited, and a package as an aggregate can be obtained, in which at least two rows and are arranged in the diameter direction (X direction and Y direction) Arrange at least 1 row, and stack at least 2 layers in the axial direction (Z direction).

Here, the axial direction refers to the axial direction (Z direction) passing through the center of the circumferential direction (R direction) of the sanitary tissue roll 10. The radial direction refers to the directions (X direction and Y direction) orthogonal to the axial direction (Z direction). "Stacking" means stacking the sanitary tissue rolls 10 in the vertical direction (Z direction) of the roll package 100 so that the end surfaces 10A of the two sanitary tissue rolls 10 face each other (Figures 1 and 2).

A "row" refers to a group of sanitary tissue rolls 10 whose side surfaces (peripheral surfaces) 10C face each other in the transverse direction or left-right direction (in this embodiment, the X direction) of the roll packaging body 100, among the plurality of sanitary tissue rolls 10 constituting the roll packaging body. A "column" refers to a group of sanitary tissue rolls whose side surfaces (peripheral surfaces) 10C face each other in the longitudinal direction (front-rear direction) of the roll packaging body, among the plurality of sanitary tissue rolls constituting the roll packaging body.

For example, when there are 24 toilet paper rolls 10 to be packaged (24 rolls), the toilet paper rolls 10 are packaged in 3 rows, 4 columns, and 2 layers. Also, when there are 32 toilet paper rolls 10 (32 rolls), the toilet paper rolls 10 are packaged in 4 rows, 4 columns, and 2 layers. In this embodiment, 24 toilet paper rolls (sanitary paper rolls) 10 are packaged so that the peripheral surfaces 10C overlap each other in the left-right direction (X direction) and the front-back direction (Y direction) and the end surfaces 11A, 11B overlap each other in the up-down direction (Z direction) ( FIG. 1 ).

The paper piece 20 is an example of the paper piece constituting the roll packaging body 100 according to this embodiment. The paper sheet 20 is a sheet-shaped packaging material made of paper. The paper piece 20 has a paper ratio of 51% or more, preferably 80% or more, and more preferably 100%.

The pulp composition of the paper constituting the paper sheet 20 is not limited, for example, the ratio of broadleaf pulp to softwood pulp is 0:100 to 70:30, preferably a pulp composition in which the softwood pulp has a higher ratio than the broadleaf pulp. Recycled pulp may also be used as the pulp.

The type of paper used for the paper sheet 20 is not particularly limited. For example, packaging paper can be used. Packaging papers are further classified as unbleached wrapping paper or bleached wrapping paper.

Examples of unbleached packaging paper include double-sided rough kraft paper for heavy packaging, general double-sided rough kraft paper, special double-sided rough kraft paper, striped kraft paper, single-gloss kraft paper, and the like.

Examples of bleached packaging paper include pure white web paper, double-sided rough bleached kraft paper, single-light bleached kraft paper, thin molded paper, and the like.

The paper used as the paper sheet 20 is preferably single gloss paper, and more preferably single gloss kraft paper. Here, single gloss paper can be obtained by using a Yankee drying cylinder to heat and dry after papermaking, and refers to a kind of paper with one side being a glossy paper with high gloss.

The basis weight of the paper sheet 20 is 35 g/m ² or more and 100 g/m ² , preferably 37 g/m ² or more and 80 g/m ² or less, more preferably 39 g/m ² or more and 60 g/m ² . Basis weight (mass per square meter) is measured in accordance with the Japanese Industrial Standard JIS P 8124:2011. In addition, the basis weight of the paper used as the paper sheet 20 is preferably changed according to the number of sanitary tissue rolls 10 to be packaged.

For example, when the number of toilet paper rolls (toilet paper rolls) 10 to be packaged is 24 (24 rolls), the basis weight of the paper used for the paper sheets 20 is preferably 35 g/m ² or more and 60 g/m 2 or more. m ² or less. In addition, when the number of toilet paper rolls 10 to be packaged is 32 (32 rolls), the basis weight of the paper used for the paper sheets 20 is preferably 39 g/m ² or more and 100 g/m ² or less.

The thickness of the paper sheet 20 is not less than 48 μm and not more than 180 μm, preferably not less than 50 μm and not more than 160 μm, and more preferably not less than 52 μm and not more than 70 μm. The thickness is measured in accordance with the provisions of Japanese Industrial Standard JIS P 8118:2014.

In this embodiment, the PPS smoothness of the inner surface 20B of the paper sheet 20 in contact with the sanitary tissue roll 10 is 4 seconds or less, preferably 3 seconds or less, and more preferably 2.6 seconds or less. In addition, although the lower limit value of PPS smoothness is not particularly limited, as an implementable lower limit value, it is preferably 0.1 second or more, more preferably 0.5 second or more, and further preferably 1.0 second or more.

Here, PPS smoothness means Parker Print Surf roughness measured in accordance with the provisions of Japanese Industrial Standard JIS P 8151:2004.

The inner surface 20B of the paper sheet 20 in contact with the sanitary tissue roll 10 refers to the inner surface of the paper sheet 20 that is mostly facing the sanitary tissue roll 10 when the sanitary tissue roll 10 is wrapped with the paper sheet 20. For example, when the paper sheet 20 is a single-gloss paper such as single-gloss kraft paper, it is preferable to wrap the sanitary tissue roll 10 in such a way that the glossy surface of the single-gloss paper becomes the inner surface 20B of the paper sheet 20.

In this embodiment, the Bekk smoothness of the inner surface 20B of the paper sheet 20 is 170 seconds to 500 seconds, preferably 200 seconds to 400 seconds, and more preferably 250 seconds to 300 seconds. Here, the Bekk smoothness refers to the standard of smoothness measured according to the provisions of Japanese Industrial Standard JIS P 8119:1998.

In this embodiment, the root mean square height Sq of the inner surface 20B of the paper sheet 20 is 0.0025 mm or less, preferably 0.0020 mm or less, and more preferably 0.0017 mm or less. In addition, although the lower limit of the root mean square height Sq is not particularly limited, as an implementable lower limit, it is preferably 0.0001 mm or more, more preferably 0.0005 mm or more, and further preferably 0.0010 mm or more.

Here, the root mean square height (Sq) represents the surface roughness measured according to the provisions of the international standard ISO 25178.

In the present embodiment, the total of the tear strength in the MD direction and the tear strength in the CD direction of the paper sheet 20 is 300 mN to 800 mN, preferably 350 mN to 750 mN, and more preferably 400 mN to 700 mN.

Here, the tear strength refers to the tear strength measured in accordance with the provisions of Japanese Industrial Standard JIS P 8116: 2000. The MD direction corresponds to the running direction (moving direction) of the paper sheet 20 relative to the paper machine for manufacturing the paper sheet 20, and the CD direction corresponds to the direction orthogonal to the running direction (moving direction).

In the present embodiment, the total of the rupture strength of the outer surface 20A of the paper sheet 20 not in contact with the sanitary tissue roll 10 and the rupture strength of the inner surface 20B in contact with the sanitary tissue roll 10 is 200 kPa to 350 kPa, preferably 220 kPa to 330 kPa, and more preferably 240 kPa to 300 kPa.

Here, the bursting strength means the bursting strength measured in accordance with the provisions of Japanese Industrial Standard JIS P 8112:2008. The outer surface 20A of the paper sheet 20 that is not in contact with the sanitary tissue roll 10 represents the outer surface where most of the paper sheet 20 is exposed when the sanitary tissue roll 10 is packaged with the paper sheet 20 .

In the roll packaging body 100 of the present embodiment, as described above, since the sanitary tissue roll 10 is directly packaged with the paper sheet 20, a roll packaging body without using resin can be provided. In addition, in the present embodiment, since a plurality of sanitary tissue rolls 10 are packaged only with the paper sheet 20, overpacking can be avoided.

In addition, in the present embodiment, the basis weight of the paper sheet 20 for packaging the plurality of sanitary tissue rolls 10 is 35 g/m ² or more and 100 g/m ² and the thickness is 48 μm or more and 180 μm or less, thereby maintaining the strength and foldability of the paper sheet 20 as the outer packaging of the sanitary tissue rolls 10. Therefore, in the present embodiment, even if the plurality of sanitary tissue rolls 10 are directly packaged with the paper sheet 20, stable packaging can be achieved.

In addition, in the present embodiment, the PPS smoothness of the inner surface 20B of the paper sheet 20 in contact with the sanitary tissue roll 10 is 4 seconds or less, thereby reducing the friction between the sanitary tissue roll 10 to be packaged and the inner surface 20B of the paper sheet 20 in contact with the sanitary tissue roll 10. Thus, even if a plurality of sanitary tissue rolls 10 are directly packaged with the paper sheet 20, the generation of fuzz and paper dust of the sanitary tissue roll 10 in the portion of the sanitary tissue roll 10 in contact with the paper sheet 20 can be suppressed (FIGS. 3 and 4).

Furthermore, in the present embodiment, as described above, since stable packaging is possible, it is possible to suppress scratches between the sanitary tissue roll 10 and the paper sheet 20 and scratches between the sanitary tissue rolls 10. Thus, even if a plurality of sanitary tissue rolls 10 are directly packaged with the paper sheet 20, it is possible to suppress the fuzzing of the sanitary tissue rolls 10 between the sanitary tissue rolls 10 and suppress the generation of paper dust (FIGS. 3 and 4).

In the roll package 100 of the present embodiment, as described above, the Buick smoothness of the inner surface 20B of the paper sheet 20 is 170 seconds or more and 500 seconds or less, thereby reliably reducing the friction between the sanitary tissue roll 10 to be packaged and the inner surface 20B of the paper sheet 20 in contact with the sanitary tissue roll 10. Thus, even if a plurality of sanitary tissue rolls 10 are directly packaged with the paper sheet 20, the generation of fuzz and paper dust of the sanitary tissue roll 10 in the portion of the sanitary tissue roll 10 in contact with the paper sheet 20 can be suppressed with high accuracy.

In the roll package 100 of the present embodiment, as described above, the root mean square height Sq of the inner surface 20B of the paper sheet 20 is 0.0025 mm or less, thereby reliably reducing the friction between the sanitary tissue roll 10 to be packaged and the inner surface 20B of the paper sheet 20 in contact with the sanitary tissue roll 10. Thus, even if a plurality of sanitary tissue rolls 10 are directly packaged with the paper sheet 20, the generation of fuzz and paper dust of the sanitary tissue roll 10 in the portion of the sanitary tissue roll 10 in contact with the paper sheet 20 can be suppressed with high accuracy.

In the roll packaging body 100 of the present embodiment, as described above, the total of the tear strength in the MD direction and the tear strength in the CD direction of the paper sheet 20 is 300 mN or more and 800 mN or less, thereby improving the strength of the paper sheet 20 as the outer packaging of the sanitary tissue roll 10. Therefore, in the present embodiment, even if a plurality of sanitary tissue rolls 10 are directly packaged with the paper sheet 20, more stable packaging can be achieved.

In the roll package 100 of this embodiment, as described above, the total bursting strength of the outer surface 20A of the paper sheet 20 that is not in contact with the sanitary tissue roll 10 and the bursting strength of the inner surface 20B that is in contact with the sanitary tissue roll 10 It is 200 kPa or more and 350 kPa or less. This can improve the strength of the paper sheet 20 as the outer package of the sanitary tissue roll 10 . Therefore, in this embodiment, even if a plurality of sanitary tissue rolls 10 are directly packaged with the paper sheets 20, more stable packaging can be achieved.

In the roll package 100 of the present embodiment, as described above, the plurality of sanitary tissue rolls 10 are arranged in more than two rows and more than one column in the radial direction (X direction and Y direction), and are stacked in more than two layers in the axial direction (Z direction). Therefore, scratches between the sanitary tissue rolls 10 and the paper sheets 20 and scratches between the sanitary tissue rolls 10 are likely to occur in the roll package 100.

However, in the present embodiment, as described above, the friction between the sanitary tissue roll 10 to be packaged and the inner surface of the paper sheet 20 in contact with the sanitary tissue roll 10 can be reduced ( FIG. 3 ), and stable packaging becomes possible.

Therefore, in this embodiment, even if a plurality of sanitary tissue rolls 10 are arranged in at least 2 rows and at least 1 column in the diameter direction (X direction and Y direction), and at least 2 stacks are overlapped in the axial direction (Z direction), In the case of an aggregate of layers, it is also possible to suppress the generation of fluff, paper dust, etc. of the sanitary tissue roll 10 at the portions of the sanitary tissue roll 10 that are in contact with the paper sheets 20 and/or between the sanitary tissue rolls 10 . [Example]

The present invention will be described in detail below with reference to the following embodiments. The evaluation of the embodiments and comparative examples was carried out through the following tests.

[Test body (roll package)] As a test body, a roll package 100 was prepared. As shown in FIG1 , the roll package 100 is composed of 24 (24 rolls) of toilet paper rolls (sanitary tissue) 10 arranged in 3 rows, 4 columns and 2 layers of an aggregate AG, and the aggregate AG is directly wrapped with kraft paper (paper sheet) 20. The toilet paper roll used was "i:na toilet paper 100m single layer (210g/roll)" (trade name) manufactured by Daio Paper Co., Ltd. Kraft paper was used as the paper sheet.

[Mass per square meter] The mass (basis weight) of the test object per square meter is measured in accordance with the Japanese Industrial Standard JIS P 8124:2011. The unit of mass per square meter is "g/m ² ".

[paper thickness] The paper thickness (thickness) of the test body measured in accordance with the provisions of Japanese Industrial Standard JIS P 8118:1998. The unit of paper thickness is "μm".

[Tear Strength] The tear strength of the test piece is measured according to the Japanese Industrial Standard JIS P 8116:2000. The tear strength is measured in the MD direction and CD direction respectively, and then the total of the tear strength in the MD direction and the tear strength in the CD direction (MD+CD) is calculated. The unit of tear strength is "mN".

[Bursting strength] Bursting strength was measured in accordance with the provisions of Japanese Industrial Standard JIS P 8112:2008. The bursting strength is to measure the outer surface (surface) and the inner surface (back) of the paper separately, and then calculate the total of the bursting strength of the outer surface (surface) and the inner surface (back) (surface + back). The unit of bursting strength is "kPa".

[PPS Smoothness] PPS smoothness is measured in accordance with the Japanese Industrial Standard JIS P 8151:2004. The unit of PPS smoothness is "seconds".

[Buick Smoothness] Buick smoothness is measured in accordance with the Japanese Industrial Standard JIS P 8119:1998. The unit of Buick smoothness is "seconds".

[Sq] Sq (root mean square height) is measured according to the international standard ISO 25178. The unit of Sq is "mm".

Sq is obtained by first performing shape correction with undulation removal (correction strength 20) on an image taken with a 3D shape measuring machine (One-shot 3D measuring microscope VR-6000 (trade name) manufactured by KEYENCE) using image analysis software (Comparison measurement module VR-H4CA (trade name) manufactured by KEYENCE), and then measuring the Sq (root mean square height) of the entire measurement surface at 5 points (places) and calculating the average value.

[Strength after packaging] Package toilet paper rolls in two parallel positions and check whether they are torn when the gap between the rolls is lifted by hand. The strength after packaging is evaluated using the following criteria. 〔Evaluation criteria〕 Good: No rupture Poor: Rupture

[Fuzz on the roll surface] After transporting the test specimen (by express delivery between Shizuoka and Ehime), the occurrence of fluffing and paper powder on the toilet paper roll was visually confirmed. [Evaluation criteria] Good: No fluffing Defect: linting

[amount of paper powder] When fluffing on the roll surface is confirmed, the occurrence of paper powder is confirmed. [Evaluation criteria] Good: Balls without paper powder Defect: Balls with paper powder

Hereinafter, embodiments and comparative examples will be described.

[Example 1] A test body (roll packaging body) was prepared using a single-gloss kraft paper (the glossy surface of the single-gloss kraft paper became the inner surface in contact with the toilet paper roll), the mass per square meter of the single-gloss kraft paper was 40g/ ^m2 , the paper thickness was 54μm, the tear strength (MD+CD) was 432mN, the burst strength (surface+back) was 250kPa, the PPS smoothness of the inner surface (inner side) in contact with the toilet paper roll was 2.44 seconds, the Buick smoothness of the inner surface (inner side) was 294 seconds, and the Sq of the inner surface (inner side) was 0.0012mm, and then the strength after packaging, the fuzz on the roll surface, and the amount of paper powder were evaluated. The conditions and results of Example 1 are shown in Table 1.

[Example 2] A single-gloss kraft paper was used, with a mass per square meter of 50 g/m ² , a paper thickness of 65 μm, a tear strength (MD + CD) of 671 mN, and a burst strength (surface + back surface) of 287 kPa. , PPS smoothness was 2.55 seconds, Buick smoothness was 283 seconds, and Sq was 0.0014 mm. A test body was produced and evaluated in the same manner as in Example 1. The conditions and results of Example 2 are shown in Table 1.

[Comparative Example 1] A test piece was prepared and evaluated in the same manner as in Example 1 except that a double-sided rough kraft paper (one side of the double-sided rough kraft paper became the inner surface in contact with the toilet paper roll) having a mass per square meter of 30 g/m ² , a paper thickness of 43 μm, a tear strength (MD+CD) of 299 mN, a burst strength (front+back) of 255 kPa, a PPS smoothness of 2.34 seconds, a Buick smoothness of 495 seconds, and an Sq of 0.0015 mm was used. The conditions and results of Comparative Example 1 are shown in Table 1.

[Comparative Example 2] A double-sided rough kraft paper having a mass per square meter of 50 g/m ² , a paper thickness of 71 μm, a tear strength (MD+CD) of 823 mN, a burst strength (front+back) of 361 kPa, a PPS smoothness of 5.99 seconds, a Buick smoothness of 43 seconds, and an Sq of 0.0026 mm was used. Test specimens were prepared and evaluated in the same manner as in Comparative Example 1. The conditions and results of Comparative Example 2 are shown in Table 1.

[Comparative Example 3] A double-sided rough kraft paper having a mass per square meter of 100 g/m ² , a paper thickness of 161 μm, a tear strength (MD+CD) of 3630 mN, a burst strength (front+back) of 646 kPa, a PPS smoothness of 8.54 seconds, a Buick smoothness of 5 seconds, and an Sq of 0.0041 mm was used. Test specimens were prepared and evaluated in the same manner as in Comparative Example 1. The conditions and results of Comparative Example 3 are shown in Table 1.

[Table 1]

According to Table 1, the test body (roll packaging body) in which a plurality of sanitary tissue rolls were directly packaged with a paper sheet having a basis weight (mass per square meter) of 35 g/m ² or more and 100 g/m ² , a thickness of 48 μm or more and 180 μm or less, a PPS smoothness of the inner surface in contact with the sanitary tissue roll of 4 seconds or less, a Buick smoothness of the inner surface of 170 seconds or more and 500 seconds or less, an Sq of the inner surface of 0.0025 or less, a tear strength (MD+CD) of 300 mN or more and 800 mN or less, and a burst strength (front+back) of 200 kPa or more and 350 kPa or less, the strength after packaging, the fuzzing of the roll surface, and the amount of paper powder were all in good condition (Examples 1 and 2).

In contrast, the test body (roll package) formed by directly packaging a plurality of sanitary tissue rolls with a paper sheet having a basis weight of less than 35 g/m ² , a thickness of less than 48 μm, and a tear strength (MD+CD) of less than 300 mN, had poor strength after packaging (Comparative Example 1). In addition, the test body (roll package) formed by directly packaging a plurality of sanitary tissue rolls with a paper sheet having a PPS smoothness of more than 4 seconds on the inner surface in contact with the sanitary tissue roll, a Buick smoothness of less than 170 seconds on the inner surface, an Sq of more than 0.0025 on the inner surface, and a burst strength (front+back) of more than 350 kPa, had poor fuzzing on the roll surface and the amount of paper powder (Comparative Examples 2 and 3).

The above describes the embodiments of the present invention. However, the present invention is not limited to the specific embodiments, and various modifications and changes can be made within the scope of the invention described in the patent application.

Below, preferred aspects of the present invention are described.

A first aspect of the present invention is a roll package in which a plurality of sanitary tissue rolls are directly packaged with paper sheets, wherein the basis weight of the paper sheets is 35 g/m ² or more and 100 g. /m ² , the thickness of the paper sheet is 48 μm or more and 180 μm or less, and the PPS smoothness of the inner surface of the paper sheet in contact with the sanitary tissue roll is 4 seconds or less.

In this specification, PPS smoothness means the roughness of the Parker Print Surface (Parker Print Surf) measured in accordance with the Japanese Industrial Standard JIS P 8151:2004. The inner surface of the paper sheet that is in contact with the sanitary tissue roll refers to the inner surface where most of the paper sheet faces the sanitary tissue roll when the sanitary tissue roll is packaged with the paper sheet.

In the first aspect, since the sanitary tissue roll is directly packaged with paper sheets, it is possible to provide a roll packaging body that does not use resin. Furthermore, in the first aspect, since the plurality of sanitary tissue rolls are packed only with paper sheets, excessive packaging can be avoided.

Moreover, in the first aspect, the basis weight of the paper sheets for packaging a plurality of sanitary tissue rolls is 35 g/m ² or more and 100 g/m ² , and the thickness is 48 μｍ or more and 180 μｍ or less. This allows the paper sheets to be maintained. Strength and foldability as outer packaging for sanitary tissue rolls. Therefore, in the first aspect, even if a plurality of sanitary tissue rolls are directly packaged with paper sheets, stable packaging can be achieved.

Furthermore, in the first aspect, the PPS smoothness of the inner surface of the paper sheet in contact with the sanitary tissue roll is 4 seconds or less, thereby reducing the risk of the packaged sanitary tissue roll and the sanitary tissue roll being in contact with it. The friction between the inner surfaces of the paper. Thereby, even if a plurality of sanitary tissue rolls are directly packaged with paper sheets, it is possible to suppress the occurrence of fluffing of the sanitary tissue roll, paper dust, etc. in the portion of the sanitary tissue roll that comes into contact with the paper sheets.

Furthermore, in the first aspect, as described above, stable packaging is possible, so that scratches between the sanitary tissue roll and the paper sheet and scratches between the sanitary tissue rolls can be suppressed. Thereby, even if a plurality of sanitary tissue rolls are directly packaged with paper sheets, fluffing of the sanitary tissue rolls between the sanitary tissue rolls can be suppressed, and the generation of paper dust can be suppressed.

The second aspect of the present invention is the roll packaging body as described in the first aspect, wherein the Buick smoothness of the inner surface of the paper sheet is 170 seconds or more and 500 seconds or less. In this specification, Buick smoothness refers to the standard of smoothness measured according to the provisions of Japanese Industrial Standard JIS P 8119:1998.

In the second embodiment, the Buick smoothness of the inner surface of the paper sheet is 170 seconds or more and 500 seconds or less, thereby reliably reducing the friction between the wrapped sanitary tissue roll and the inner surface of the paper sheet in contact with the sanitary tissue roll. Thus, even if a plurality of sanitary tissue rolls are directly wrapped with paper sheets, the generation of fuzz and paper dust of the sanitary tissue roll in the portion of the sanitary tissue roll in contact with the paper sheet can be suppressed with high accuracy.

A third aspect of the present invention is the roll packaging body according to the first or second aspect, wherein the root mean square height Sq of the inner surface of the paper sheet is 0.0025 mm or less. In this specification, the root mean square height Sq represents the surface roughness measured according to the international standard ISO 25178.

In the third aspect, further, the root mean square height Sq of the inner surface of the paper sheet is 0.0025 mm or less, whereby the inner surface of the packaged sanitary tissue roll and the paper sheet in contact with the sanitary tissue roll can be reliably reduced. Friction between surfaces. Thereby, even if a plurality of sanitary tissue rolls are directly packaged with paper sheets, it is possible to suppress the occurrence of fluffing, paper dust, etc. of the sanitary tissue roll in the portion of the sanitary tissue roll that comes into contact with the paper sheets with high accuracy.

A fourth aspect of the present invention is a roll packaging body as described in any one of the first to third aspects, wherein the total of the tear strength of the paper sheet in the MD direction and the tear strength in the CD direction is greater than or equal to 300 mN and less than or equal to 800 mN.

In this specification, tear strength refers to the tear strength measured in accordance with the provisions of Japanese Industrial Standards JIS P 8116: 2000. The MD direction corresponds to the direction of travel of the paper sheet relative to the paper machine for making the paper sheet, and the CD direction corresponds to the direction orthogonal to the travel direction.

In the fourth aspect, the total of the tear strength in the MD direction and the tear strength in the CD direction of the paper sheet is 300 mN or more and 800 mN or less. This can improve the strength of the paper sheet as an outer package of the sanitary tissue roll. Therefore, in the fourth aspect, even if a plurality of sanitary tissue rolls are directly packaged with paper sheets, more stable packaging can be achieved.

The fifth aspect of the present invention is a roll packaging body as described in any one of the first to fourth aspects, wherein the total of the rupture strength of the outer surface of the paper sheet not in contact with the sanitary tissue roll and the rupture strength of the inner surface is greater than or equal to 200 kPa and less than or equal to 350 kPa.

In this specification, the bursting strength indicates the bursting strength measured in accordance with the provisions of Japanese Industrial Standard JIS P 8112:2008. The outer surface of the paper sheet that is not in contact with the sanitary tissue roll refers to the outer surface where most of the paper sheet is exposed when the sanitary tissue roll is packaged with the paper sheet.

In the fifth aspect, the total bursting strength of the outer surface of the paper sheet not in contact with the sanitary tissue roll and the bursting strength of the inner surface in contact with the sanitary tissue roll is 200 kPa or more and 350 kPa or less, whereby the performance can be improved. The strength of the outer wrapping paper of a sanitary tissue roll. Therefore, in the fifth aspect, even if a plurality of sanitary tissue rolls are directly packaged with paper sheets, more stable packaging can be achieved.

The sixth aspect of the present invention is a roll packaging body as described in any one of the first to fifth aspects, which is an aggregate of the aforementioned plurality of sanitary tissue rolls arranged in at least two rows and at least one column in the radial direction and stacked in at least two layers in the axial direction.

In this specification, the axial direction refers to the axial direction passing through the center of the circumference of the sanitary tissue roll. The radial direction refers to the direction perpendicular to the axial direction. "Stacking" means stacking sanitary tissue rolls in the height direction (vertical direction) of the roll package so that the end faces of two sanitary tissue rolls face each other.

A "row" refers to a set of sanitary tissue rolls whose peripheral surfaces face each other in the horizontal direction (left-right direction) of the roll packaging body among the plurality of sanitary tissue rolls constituting the roll packaging body. A "column" refers to a set of sanitary tissue rolls whose peripheral surfaces face each other in the longitudinal direction (front-back direction) of the roll packaging body among the plurality of sanitary tissue rolls constituting the roll packaging body.

In the sixth aspect, a plurality of sanitary tissue rolls are arranged in two or more rows and one or more columns in the radial direction and are stacked in two or more layers in the axial direction. Therefore, scratches between the sanitary tissue rolls and paper sheets and scratches between the sanitary tissue rolls are likely to occur in the roll package. However, in the sixth aspect, as described above, the friction between the sanitary tissue rolls to be packaged and the inner surface of the paper sheet in contact with the sanitary tissue rolls can be reduced, and stable packaging is possible.

Therefore, in the sixth aspect, even if a plurality of sanitary tissue rolls are arranged in at least two rows and at least one column in the diameter direction, and are stacked in at least two layers in the axial direction, it can be suppressed. The occurrence of fluff and paper powder of the sanitary tissue roll at the parts of the sanitary tissue roll that are in contact with the paper sheets and/or between the sanitary tissue rolls.

This application claims priority based on Japanese Patent Application No. 2022-131520 filed on August 22, 2022, the entire contents of which are incorporated herein by reference.

100:Roll packaging body 10: Toilet tissue roll (toilet paper roll) 10A: End face 10B: End face 10C: Side (surrounding surface) 11: Hollow core 12: Toilet tissue (toilet paper) 12A:One end 20: pieces of paper 20A:Outer surface 20B:Inner surface 21:Top surface 22: Bottom surface 23:front 24:Back 25: Side (left side) 26: Side (right side) AG: aggregate

FIG. 1 is a diagram showing an example of a roll package. FIG. 2 is a diagram showing one sanitary tissue roll. FIG. 3 is a cross-sectional view along line A-A in FIG. 1 . FIG. 4 is a cross-sectional view along line B-B in FIG. 1 .

Domestic storage information (please note in order of storage institution, date and number) without Overseas storage information (please note in order of storage country, institution, date, and number) without

100:Roll packaging body

10: Toilet paper roll (toilet paper roll)

10A: End face

10C: Side (surrounding surface)

11: Hollow core

12: Toilet paper (toilet paper)

20: Paper

21: Top

22: Bottom surface

23:front

24: Back

25: Side (left side)

26: Side (right side)

AG: Aggregate

Claims (6)

A roll package is a roll package formed by directly packaging a plurality of sanitary tissue rolls with paper sheets, wherein the basis weight of the paper sheets is greater than 35 g/ ^m2 and less than 100 g/ ^m2 , the thickness of the paper sheets is greater than 48 μm and less than 180 μm, and the PPS smoothness of the inner surface of the paper sheets in contact with the sanitary tissue rolls is less than 4 seconds. The roll packaging body according to claim 1, wherein the Buick smoothness of the inner surface of the paper sheet is 170 seconds or more and 500 seconds or less. The roll packaging body according to claim 1, wherein the root mean square height Sq of the inner surface of the paper sheet is 0.0025 mm or less. The roll packaging body as described in claim 1, wherein the total of the tear strength of the paper sheet in the MD direction and the tear strength in the CD direction is greater than or equal to 300 mN and less than or equal to 800 mN. A roll packaging body as described in claim 1, wherein the total of the rupture strength of the outer surface of the paper sheet not in contact with the sanitary tissue roll and the rupture strength of the inner surface is greater than or equal to 200 kPa and less than or equal to 350 kPa. The roll packaging body as described in any one of claims 1 to 5 is an aggregate formed by the aforementioned plurality of sanitary tissue rolls arranged in at least 2 rows and at least 1 column in the radial direction and stacked in at least 2 layers in the axial direction.

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