JP6974002B2 - Sanitary paper roll package - Google Patents

Description

The present invention relates to a sanitary paper roll package obtained by caramel-wrapping a sanitary paper roll that can be suitably used for paper towels, kitchen towels, and the like.

A plurality of sanitary paper rolls such as toilet rolls and kitchen towels are caramel-wrapped with a film, and a sanitary paper roll package having a handle attached to the upper surface has been developed (Patent Documents 1 and 2).
Further, as shown in FIG. 6, in the case of a lightweight sanitary paper roll package 100 such as two rolls, the film 120 between the two sanitary paper rolls 110 arranged in the horizontal direction without attaching a handle is shown by an arrow. It may be carried by picking it from both sides with one hand.

Japanese Patent No. 4237035 Japanese Patent No. 5026165

By the way, in recent years, from the viewpoint of portability and storability, a compact roll having a longer winding length has been required, and the roll is hardened as the winding length is increased, so that the mass of the roll is also increased. It's getting bigger.
However, when the roll length of the sanitary paper roll becomes long and the mass of the roll becomes large, when the sanitary paper roll package 100 is picked from both sides with one hand as shown in FIG. 6, acupressure is applied to the film 120 and a crevice 120v is generated. There's a problem.
On the other hand, if the film is loosely wrapped, the acupressure escapes and does not concentrate on one point, so that the occurrence of crevices can be prevented, but the package becomes loose and the cosmeticity of the package is inferior. Further, even if the film is made thicker, the crevice is suppressed, but the cost is increased.
Therefore, an object of the present invention is to provide a low-cost sanitary paper roll package having excellent cosmetic properties while suppressing tearing of a caramel-wrapped film of a sanitary paper roll having a long roll length.

In order to suppress the tearing of the caramel-wrapped film of the sanitary paper roll, the present inventors regulate the roll length and roll density of the sanitary paper roll, and also regulate the degree of looseness of the film to suppress the tearing of the film. At the same time, it was found that beauty can be ensured.

That is, the sanitary paper roll package of the present invention is a sanitary paper roll package in which an even number of sanitary paper rolls are caramel-wrapped with a film, and the roll length of the sanitary paper roll is 15 to 60 m and the roll density is 0.10 to 0. .21 g / cm ³ , the film thickness is 18-45 μm, the sanitary paper rolls are lined up in two rows in the direction perpendicular to the axial direction and both ends are aligned, and the film is folded on both ends. The sanitary paper roll package is placed so that the axial direction is horizontal, and straddles two rows of the sanitary paper rolls adjacent to each other in the direction perpendicular to the axial direction, and has a mass of 64 g and a thickness of 1. A first ruler made of stainless steel having a width of 2.0 mm, a width of 25 mm, and a scale length of 300 mm was passed, and the plate surface was placed so as to be in contact with the film to serve as a reference line, and one long side of the first ruler was the above. The height of the sanitary paper roll package is 25% with respect to h from both ends, and is located at three measurement points m in the center, and then the sanitary paper roll is packaged across the two rows of sanitary paper rolls. A second ruler made of stainless steel having a mass of 10 g, a thickness of 0.5 mm, a width of 15 mm, and a scale length of 150 mm is attached to the second ruler so as to be in contact with the long side at each measurement point m on the film. When mounted so that the width direction is perpendicular to the axial direction, the distance D from the reference line to the tip of the second ruler is set, the measurement point m is set as the front and back sides of one sanitary paper roll package, and five pieces are used. The maximum dent amount of the film measured by averaging the values of the distance D at a total of 30 locations is 3 to 25 mm.

The basis weight of the film is preferably ^{16 to 41 g / m 2.}
The ratio represented by (total mass including the core of one row of sanitary paper rolls) / (thickness of the film) is preferably 5.0 to 18.0 ((g) / (μm)).
The film is preferably made of polyethylene.

According to the present invention, it is possible to obtain a low-cost sanitary paper roll package having excellent cosmetic properties while suppressing tearing of a caramel-wrapped film of a sanitary paper roll having a long roll length.

It is a perspective view which shows the sanitary paper roll package which concerns on embodiment of this invention. It is a figure which shows the measuring method of a roll density. It is a figure which shows the measuring method of the maximum dent amount of a film in a sanitary paper roll package. It is another figure which shows the measuring method of the maximum dent amount of a film in a sanitary paper roll package. It is a perspective view which shows the modification of the sanitary paper roll package which concerns on embodiment of this invention. It is a perspective view which shows the conventional sanitary paper roll package. It is a figure which shows the measuring method of the water absorption amount.

Preferred embodiments of the present invention will be described below, but these are listed for the purpose of illustration and do not limit the present invention.
As shown in FIG. 1, the sanitary paper roll package 10 according to the embodiment of the present invention is formed by caramel-wrapping two sanitary paper rolls 2 with a film 4, so that the sanitary paper rolls 2 are arranged in two horizontal rows and both ends are aligned. The film 4 is folded and sealed with flaps 4a and 4b on both end faces.
Here, the fact that the sanitary paper rolls 2 are lined up in two horizontal rows means that the outer surfaces of the sanitary paper rolls 2 are adjacent to each other while the axes L are parallel to each other, and both end surfaces (upper surface and lower surface) are substantially aligned on the same plane. ..

<sanitary paper roll>
Examples of the sanitary paper roll 2 include kitchen towels, but are not particularly limited.
The roll length of the sanitary paper roll 2 is 15 to 60 m, and the roll density is 0.10 to 0.21 g / cm ³ . As a result, the frequency of replacement of the sanitary paper roll 2 is reduced, space is saved during storage, and the formation of tears in the film is suppressed.

If the roll length of the sanitary paper roll 2 is less than 15 m, the roll length per roll becomes short, the rolls are frequently replaced, and space cannot be saved during storage. If the roll length exceeds 60 m, the mass of the roll becomes large, so when the sanitary paper roll package 10 is picked from both sides with one hand, acupressure is applied to the film 4 to cause a tear. In addition, the winding diameter DR exceeds 155 mm, which makes it difficult to fit in a roll holder or the like.
The winding length is preferably 20 to 50 m, more preferably 30 to 40 m.

If the roll density of the sanitary paper roll 2 ^{is less than 0.10 g / cm 3} , the roll diameter per roll length becomes excessive, and space cannot be saved during storage. If the roll density ^{exceeds 0.21 g / cm 3} , the roll will be too stiff, the roll will not be easily deformed when the sanitary paper roll package is picked from both sides with one hand, and the acupressure will be concentrated on one point of the film. There is a rift in the film.
The roll density is preferably 0.12 to 0.18 g / cm ³ , more preferably 0.14 to 0.16 g / cm ³ .
As shown in FIG. 2, the roll density is a value obtained by multiplying the bottom area S of one sanitary paper roll 2 excluding the core C by the roll width (height) W (that is, one sanitary paper excluding the core C). The volume of the roll 2) is obtained, and the mass of one sanitary paper roll 2 excluding the core C is divided by this volume.
For example, when the roll mass excluding the core C is 293 g, the winding diameter is 118 mm, the core diameter is 39 mm, and the roll width (height) is 207 mm, the roll density = 293 g ÷ [{3.14 × (118 mm ÷ 2 ÷ 10)). a ^{2 -3.14 × (39mm ÷ 2 ÷} 10) 2} × (207mm ÷ 10)] = 0.15g / cm 3. The core (paper tube) diameter is the diameter of the center hole of the roll. If there is a core, it is the outer diameter of the core, and if there is no core, it is the diameter of the center hole of the roll 2. It is preferable to have a core because the shape of the roll is stable when the roll is used.

The sanitary paper roll 2 is manufactured by using a roll winding processing machine. There are roughly two types of roll take-up machines: surface type and center type. The surface method is a method of winding the wound sanitary paper roll 2 while supporting it from the outside with a plurality of different drive rolls, and the wound sanitary paper roll 2 is easy to control the winding diameter and has a higher production speed. Become. The center method is a method of winding by driving a shaft passed through the center of the winding roll, and the wound sanitary paper roll 2 becomes a relatively soft product and is suitable for a delicately embossed product. When embossing, double embossing that easily improves water absorption is preferable. Further, in double embossing, nested embossing is preferable.
In the present invention, any method can be used for winding, but the surface method is preferable. According to the surface method, the winding diameter and roll density of the sanitary paper roll 2 can be adjusted relatively easily by the strength of winding the sanitary paper roll 2. At this time, the pressing force of the rider roll for pressing the sanitary paper roll 2 from the outer peripheral side to sequentially wind the sheet can be adjusted by setting it within a predetermined range.

<Film>
The thickness of the film 4 is 18 to 45 μm.
If the thickness of the film is less than 18 μm, when the sanitary paper roll package 10 is picked from both sides with one hand, acupressure is applied to the film 4 to cause a tear. If the thickness of the film 4 exceeds 45 μm, the cost will increase.
The thickness of the film 4 is preferably 22 to 40 μm, more preferably 25 to 33 μm.
As the film 4, for example, various plastic films can be used, and polyethylene is particularly preferable. Since polyethylene is softer than polypropylene and the like, the film tends to be difficult to tear. Among the polyethylenes, low density polyethylene is preferable.

The basis weight of the film 4 is preferably 16 to 41 g / m ² , more preferably 19 to 35 g / m ² , and even more preferably 23 to 29 g / m ² .
If the basis weight of the film 4 ^{is less than 16 g / m 2} , when the sanitary paper roll package 10 is picked from both sides with one hand, acupressure may be applied to the film 4 to cause a tear.
If the basis weight of the film 4 ^{exceeds 41 g / m 2} , the cost may increase.

The density of the film 4 is preferably 0.5 to 1.3 g / cm ³ , more preferably 0.6 to 1.2 g / cm ³ , and even more preferably 0.7 to 1.1 g / cm ³ .
If the density of the film 4 ^{is less than 0.5 g / cm 3} , when the sanitary paper roll package 10 is picked from both sides with one hand, acupressure may be applied to the film 4 to cause a tear.
If the density of the film 4 ^{exceeds 1.3 g / cm 3} , it may lead to an increase in cost.

The tensile strength of the film 4 in the circumferential length direction is preferably 5.0 to 14.0 N / 10 mm, more preferably 6.5 to 12.0 N / 10 mm, still more preferably 7.5 to 10.5 N / 10 mm.
Here, the tensile strength of the film 4 in the circumferential direction is the tensile strength of the film 4 along the circumferential direction of the sanitary paper roll 2 in the sanitary paper roll package 10, and is measured in accordance with JIS Z 1702.
Specifically, the sanitary paper roll 2 is removed from the sanitary paper roll package 10, the film 4 is cut off, and the tensile strength along the direction (peripheral length direction) P perpendicular to the axial direction L is measured as shown in FIG. In the perimeter direction, when the sanitary paper roll package 10 is picked from both sides with one hand, the film splits while spreading in the direction P as shown in FIG. 6, so the film is increased in tensile strength in the perimeter direction. This is because it is possible to prevent the film from tearing. Further, in many cases, the MD direction of the film 4 is generally set to the axial direction L, and in this case, the strength in the circumferential length direction of the film is weaker than the strength in the vertical direction (axial direction L). It is necessary to secure it.

If the tensile strength of the film 4 in the circumferential direction is less than 5.0 N / 10 mm, when the sanitary paper roll package 10 is picked from both sides with one hand, acupressure may be applied to the film 4 to cause a tear.
If the tensile strength of the film 4 in the circumferential length direction exceeds 14.0 N / 10 mm, the cost may increase.

Further, when measuring the tensile strength in the circumferential length direction, the elongation to break is 500 to 1300%, preferably 600 to 1200%, and more preferably 700 to 1100%. If the elongation to break is less than 500%, when the sanitary paper roll package 10 is picked from both sides with one hand, acupressure may be applied to the film 4 to cause a tear. If the elongation to break exceeds 1200%, it may lead to an increase in cost.

The tear strength of the film 4 in the axial direction L is preferably 0.06 to 0.30N, more preferably 0.10 to 0.26N, and even more preferably 0.14 to 0.22N.
If the tear strength is less than 0.06 N, when the sanitary paper roll package 10 is picked from both sides with one hand, acupressure may be applied to the film 4 to cause a tear. If the tear strength exceeds 0.30N, it may lead to an increase in cost.
As described above, in many cases, the MD direction of the film 4 is set to the axial direction L, and in this case, the tear strength of the film 4 in the axial direction L is about 1/10 to 1/1 of the tear strength in the peripheral direction P. It becomes as small as 60. Therefore, the tear strength in the axial direction L is defined. That is, the tear strength in the circumferential length direction is about 10 times or more higher than the tear strength in the axial direction L, so that there is no particular problem.
Tear strength is measured according to JIS K 7128-2.

<sanitary paper roll package>
As shown in FIG. 1, the sanitary paper roll package 10 is formed by caramel-wrapping two sanitary paper rolls 2 arranged in two horizontal rows with a film 4.
Caramel packaging is known, and a film extending along one direction of an object to be packaged is wrapped around the object to be packaged in a direction intersecting this direction, or is packaged from one end of a film formed in a tubular shape in the axial direction. Put your body in. Then, of the films protruding from both ends of the packaged body, the two opposing flap-shaped sides are folded with each other, and then the other two opposing flap-shaped sides are similarly folded with each other, and these folded portions are heated. Seal by fusion.
Then, in the sanitary paper roll package 10 of the present invention, the film 4 packaged across the horizontal direction (direction intersecting the axial direction L) of the two sanitary paper rolls 2 arranged in two horizontal rows is slightly covered. The slack portion 4s is generated.

<Degree of slack in the film>
As described above, when the roll length of the sanitary paper roll is long and the mass of the roll is also large, when the sanitary paper roll package is picked from both sides with one hand, acupressure is applied to the film and a tear is generated. On the other hand, if the film is wrapped too loosely, the package will loosen and the cosmeticity of the package will be inferior.
Therefore, by defining the degree of slack in the film 4, the cosmeticity is ensured while suppressing the tearing of the film.

The degree of slack in the film 4 is measured as shown in FIGS. 3 and 4.
First, the sanitary paper roll package 10 is placed so that the axial direction L of the sanitary paper roll 2 is horizontal, and two rows adjacent to each other in the horizontal direction (that is, perpendicular to the axial direction L) (two in FIGS. 1 and 3). A stainless steel first ruler S having a mass of 64 g, a thickness of 1.0 mm, a width of 25 mm, and a scale length of 300 mm was passed across the sanitary paper roll 2 and placed so that the plate surface was in contact with the film 4, and the first ruler S was placed. The surface (line) in contact with the film 4 is defined as the reference line SL.
Next, of the slack portions 4s of the film 4 packaged across the two rows (two in FIGS. 1 and 3) of the sanitary paper rolls 2 adjacent to each other in the lateral direction, approximately the center between the sanitary paper rolls 2 in each row. A second ruler R made of stainless steel having a mass of 10 g, a thickness of 0.5 mm, a width of 15 mm, and a scale length of 150 mm is placed on the top, and the width direction Rw of the second ruler R is parallel to the end surface of the sanitary paper roll 2 (that is, the axial direction L). When placed so as to be perpendicular to), the distance (sinking amount) D from the reference line SL to the tip of the second ruler R is measured.

The distance D is measured at a position 25% with respect to h from both ends of the height h of the sanitary paper roll package 10 and at three central points (three measurement points m in FIG. 1). In addition, measurement is performed on the front and back of one package. This is done for 5 sanitary paper roll packages 10, the values of the distance D at a total of 30 places are averaged, and the maximum dent amount of the film is adopted.
As the first ruler S and the second ruler R, for example, "straight scale silver" manufactured by Shinwa Measurement Co., Ltd. can be used.

The maximum amount of dent of the film measured in this way is 3 to 25 mm.
When the maximum amount of dent of the film is less than 3 mm, when the sanitary paper roll package 10 is picked from both sides with one hand, acupressure tends to concentrate on one point of the film 4, and a tear is generated. If the maximum amount of dent of the film exceeds 25 mm, acupressure can escape and the occurrence of crevices can be prevented, but the package becomes loose and the cosmeticity of the package is inferior.
The maximum amount of dent of the film is preferably 4 to 20 mm, more preferably 6 to 15 mm.
The thickness and width of the second ruler R reproduce the thickness and width of the thumb nail, and simulate a harsh situation in which the package 10 is picked up with the nail slightly raised.

<Other characteristics of sanitary paper rolls>
The ratio expressed by (total mass (g) including core C in one row of sanitary paper rolls (1 in FIG. 1)) / (thickness (μm) of film 4) is 5.0 to 18.0 ((g). ) / (Μm)).
If the above ratio is less than 5.0 ((g) / (μm)), the thickness of the film 4 with respect to the roll mass becomes excessive, which leads to an increase in the cost of the sanitary paper roll package 10. On the other hand, when the above ratio exceeds 18.0 ((g) / (μm)), the thickness of the film 4 with respect to the roll mass becomes too thin, and when the sanitary paper roll package 10 is picked from both sides with one hand, the film 4 Acupressure may be applied to the crevice, which may cause a rift.
The above ratio is preferably 6.5 to 15.5 ((g) / (μm)), more preferably 9.0 to 11.5 ((g) / (μm)).
As shown in FIG. 5, when there are four rolls, it goes without saying that the total mass including the core C in one row of sanitary paper rolls is the total mass of the two sanitary paper rolls 2.

The roll diameter DR of the sanitary paper roll 2 is preferably 83 to 155 mm, more preferably 90 to 145 mm, and even more preferably 111 to 130 mm.
When the winding diameter DR is 83 to 155 mm, it is preferable because it is easy to fit in the roll holder or the like while increasing the winding length to 15 m or more. If the winding diameter DR is less than 83 mm, the winding length per roll may become short, the rolls may be replaced frequently, or space may not be saved during storage. If the winding diameter DR exceeds 155 mm, it may be difficult to fit in a roll holder or the like.

The roll width (height) W of the sanitary paper roll 2 is preferably 180 to 250 mm, more preferably 190 to 240 mm, and further preferably 200 to 230 mm.
If the roll width (height) W is less than 180 mm, the sheet may be small and difficult to use during use. If the roll width (height) W exceeds 250 mm, the sheet may be larger than necessary and may be wasted.

The mass of one sanitary paper roll 2 excluding the core C is preferably 110 to 550 g, more preferably 150 to 470 g, and further preferably 220 to 370 g.
If the mass is less than 110 g, the thickness of the film 4 becomes excessive with respect to the roll mass, which may lead to an increase in the cost of the sanitary paper roll package 10. In addition, the winding length per roll may be shortened, and the frequency of roll replacement may increase.
If the mass exceeds 550 g, the thickness of the film 4 with respect to the roll mass becomes too thin, and when the sanitary paper roll package 10 is picked from both sides with one hand, acupressure may be applied to the film 4 and a crevice may occur. In addition, the roll may become too large and may be difficult to fit in the roll holder or the like.

The basis weight per product ply of the sheet constituting the sanitary paper roll 2 is preferably 26 to 58 g / m ³ , more preferably 32 to 52 g / m ³ , and further preferably 38 to 46 g / m ³ .
If the basis weight is ^{less than 26 g / m 3} , the sheet may be easily torn or the water absorption may be inferior. If the basis weight ^{exceeds 58 g / m 3} , the strength may become too high, or the bulk (bulk height) may become too high, and the winding diameter DR may exceed 155 mm, making it difficult to fit in a roll holder or the like. ..

It is preferably specific volume of the sheet constituting the sanitary paper roll 2 at 5 to 15 cm ³ / g, more preferably at 6~12cm ³ / g, more preferably from 7~9cm ³ / g.
If the specific volume is ^{less than 5 cm 3} / g, the water absorption may be inferior. On the other hand, if the specific volume ^{exceeds 15 cm 3} / g, the bulk (bulk height) becomes too high and the winding diameter DR exceeds 155 mm, which may make it difficult to fit in a roll holder or the like.
The specific volume is expressed by dividing the measured paper thickness by the basis weight and expressing the volume per unit g as cm3, as will be described later.

The paper thickness of the sheets constituting the sanitary paper roll 2 is preferably 1.0 to 3.2 mm / 10 sheets, more preferably 1.2 to 2.5 mm / 10 sheets, and further preferably 1.4 to 2.0 mm. / 10 sheets.
If the paper thickness of the sheet is less than 1.0 mm / 10, the water absorption may be inferior. On the other hand, if the paper thickness exceeds 3.2 mm / 10 sheets, the bulk (bulk height) becomes too high and the winding diameter DR exceeds 155 mm, which may make it difficult to fit in a roll holder or the like.

When the longitudinal tensile strength during drying is DMDT (Dry Machine Direction Tensile strength) and the lateral tensile strength during drying is DCDT (Dry Cross Direction Tensile strength) based on JIS P8113, DMDT of the sheet is preferable. Is 11.0 to 27.0 N / 25 mm. The DCDT of the sheet is preferably 3.0 to 11.0 N / 25 mm. In addition, DMDT and DCDT are measured for the sheet with the number of product plies as it is.
The DMDT is more preferably 13.0 to 25.0 N / 25 mm, still more preferably 15.0 to 23.0 N / 25 mm. DCDT is more preferably 4.0 to 10.0 N / 25 mm, still more preferably 5.0 to 9.0 N / 25 mm.
If the DMDT and DCDT are less than the above values, the water absorption may be lowered and the water may be easily shaken. If DMDT and DCDT are higher than the above values, the cost may increase or the texture may become hard.
The flow direction of the papermaking of sanitary paper (sheet) is defined as "vertical direction", and the direction perpendicular to the flow direction is defined as "horizontal direction".

The water absorption of the sheet is in accordance with the water absorption of the old JIS-S3104 method, with a temperature of 23 ± 1 ° C and a humidity of 50 ± 2%. Measure the time (seconds) of absorption. The water absorption is preferably 1.0 to 5.0 seconds. Even if the water absorption is less than 1.0 second, it is considered to be 1.0 second. If the degree of water absorption exceeds 5.0 seconds, the water absorption may be inferior. Even if the water absorption is less than 1.0 second, there is no particular problem. The water absorption is more preferably 1.0 to 4.0 seconds, still more preferably 1.0 to 3.0 seconds.
The amount of water absorption per sheet area of the product ply number is preferably ^{105 to 250 Water-g / m 2.} If the amount of water absorption is ^{less than 105 Water-g / m 2} , the water absorption is lowered, and if ^{it exceeds 250 Water-g / m 2} , the cost may increase or the texture may become hard.
More preferably water absorption amount is 130~220Water-g / ^{m 2,} further preferably 150~190Water-g / ^{m 2.}

It is preferable that the amount of water absorption per mass of the sheet having the number of product plies is 2.7 to 5.4 Water-g / g. If the amount of water absorption is less than 2.7 Water-g / g, the water absorption will decrease, and if it exceeds 5.4 Water-g / g, the basis weight and paper thickness will increase and the winding diameter DR will also increase, making it suitable for roll holders, etc. It may be difficult to fit.
The amount of water absorption is more preferably 3.2 to 4.9 Water-g / g, and even more preferably 3.7 to 4.5 Water-g / g.

As described above, as a unit of water absorption, Water-g / m ² is the amount of water absorption per sheet area, and if the basis weight is increased, Water-g / m ² is improved, but the cost is increased accordingly. It will be up. On the other hand, Water-g / g is the amount of water absorption per mass of the sheet, and even if the basis weight is increased, Water-g / g is not simply improved, and the paper thickness (specific volume) of the sheet is increased. Therefore, Water-g / g also increases.
That is, by defining a suitable range of both Water-g / m ² and Water-g / g as the unit of water absorption, it is possible to secure water absorption while achieving both cost and paper thickness (bulkness).

Each water absorption amount is measured as shown in FIG. First, the sheets stacked on the number of product plies are collected and cut using a square mold having a length of 7.62 cm (3 inches) to prepare a rectangular test piece having a side of 7.62 cm. Measure the mass of the test piece before water absorption with an electronic balance. Set the test piece in the holder (a jig that fixes the three points of the test piece, and the jig is made of metal that does not absorb water).
Next, distilled water is placed in a commercially available vat at a depth of 1 cm, and the test piece set in the holder is immersed in the distilled water for 2 minutes. After soaking for 2 minutes, the test piece is taken out from the distilled water together with the holder, and the band 210 is attached to one corner 200d of the test piece 200 as shown in FIG. For the band 210, cut a 1ply general kitchen towel paper product into a size of 2 mm in width × 15 mm in length, and attach it to a portion 6 mm from the corner 200 d of the test piece toward the center.

Next, the holder and the test piece 200 are hung on a rod installed in an empty water tank with the corner portion 200a facing the corner portion 200d facing up, the lid of the water tank is closed, and the test piece 200 is left for 30 minutes. After that, the holder 220 and the test piece 200 are taken out from the water tank, the band 210 and the holder 220 are removed, and the mass of the test piece 200 is measured with an electronic balance. The amount of distilled water absorbed per 1 m2 of the test piece (Water-g / m ² ) is calculated from the change in the mass of the test piece 200 before and after immersion in the distilled water.
Further, the water absorption amount by dividing the basis weight of the number of products ply (Water-g / ^{m 2)} The test piece, the water absorption amount ^{(Water-g / m 2)} / basis weight of the product number ply (g ^{/ m} 2) = Calculate the amount of water absorption (Water-g / g). The measurement was performed 5 times for each sample, and the average value was adopted.
This measurement is carried out in a state of temperature 23 ± 1 ° C. and humidity 50 ± 2% according to the JIS-P8111 method. Distilled water is kept at 23 ± 1 ° C.

It goes without saying that the present invention is not limited to the above-described embodiments, but extends to various modifications and equivalents included in the idea and scope of the present invention.
As shown in FIG. 5, the sanitary paper rolls 2 packaged in the sanitary paper roll package are an even number other than two (four in FIG. 5) if they are arranged in two rows in the direction perpendicular to the axial direction L. You may. In this case, the number of sanitary paper rolls 2 arranged in each row along the axial direction L is the same. Further, the height h is the length from the top to the bottom of the sanitary paper rolls 2 arranged along the axial direction L of each row.

Sheets having a pulp composition (% by mass) of NBKP 50% and LBKP 50% were stacked on two plies to produce a sanitary paper roll 2 composed of a kitchen towel wound by a known surface type roll winding processing machine, and two sanitary paper rolls. 2 was caramel-wrapped with a polyethylene film 4 as shown in FIG. 1 to obtain a sanitary paper roll package 10.

The following evaluations were made.
Basis weight: The sheets constituting the film 4 and the sanitary paper roll 2 were measured based on JIS P8124.
Paper thickness: The sheets constituting the sanitary paper roll 2 were measured using a thickness gauge (dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho). The measurement conditions were a measuring load of 3.7 kPa, a stylus diameter of 30 mm, a sample was placed between the stylus and the measuring table, and the gauge when the stylus was lowered at a speed of 1 mm or less per second was read. The measurement was performed by stacking 10 sheets (5 sets of 2 plies). The measurement was repeated 10 times and the measurement results were averaged.
Longitudinal tensile strength during drying DMDT and lateral tensile strength during drying DCDT: Based on JIS P8113, the maximum load to break was measured for each sheet with the number of product plies in units of N / 25 mm. The tensile speed was set to 300 mm / min.

Film thickness: Measured according to JIS Z 1702.
Specific volume and density: The thickness per ply of the sheet was divided by the basis weight per ply, and the specific volume was expressed by ^{the volume cm 3 per unit g.} Further, the basis weight of the film was divided by the thickness, and the density was expressed by g per ^{unit volume cm 3.}
Roll mass: The roll mass was measured using an electronic balance. First, the roll mass including the core was measured, and then the mass of the core was measured. The core mass was subtracted from the roll mass including the core to obtain the roll mass not including the core. For the roll mass, 10 rolls were measured and the measurement results were averaged.

Winding length: First, the length of 10 sheets was actually measured for the sheets between the perforations of the roll, and the average value was taken as the length of 1 sheet. After that, the total number of sheets between the perforations of one roll was actually measured, and the winding length was obtained by multiplying the average length of one sheet by the number of sheets. For example, when the length of 10 sheets is 1.135 m and the number of sheets is 300, 1.135 m × (300/10) = 34 m. When there were no perforations, the winding length was determined by actually measuring the length of one roll.
Tensile strength in the perimeter direction of the film: Measured by the method described above. The conditions for the tensile test were in accordance with JIS Z 1702. The test piece had a dumbbell shape, the tensile speed was 500 mm / min, and the value was N / 10 mm.

Roll winding diameter DR and core diameter (outer diameter): Measured using a diameter rule manufactured by Muratec KDS Co., Ltd. In the measurement, 10 rolls were measured and the measurement results were averaged.
The roll density and the maximum amount of dent of the film were measured by the above-mentioned method.

Sensory evaluation was performed by 20 monitors. The evaluation standard was a maximum of 5 points. It is good if the evaluation standard is 3 points or more.
Basis weight, tensile strength, thickness, specific volume, roll mass, core mass, winding length, winding diameter, core diameter (outer diameter), roll density, film basis weight, film thickness, film The tensile strength in the circumferential length direction and the maximum dent amount of the film were measured after holding in an equilibrium state under the temperature and humidity conditions (23 ± 1 ° C., 50 ± 2% RH) specified in JIS-P8111.

The obtained results are shown in Tables 1 to 3.

As is clear from Tables 1 to 3, in the case of each embodiment in which the roll length, roll density, film thickness, and maximum dent amount of the film are specified within a predetermined range, the caramel-wrapped film is torn. It was possible to obtain a low-cost sanitary paper roll package with excellent cosmetic properties as well as suppression.

On the other hand, in the case of Comparative Example 1 in which the thickness of the film was less than 18 μm, the film was torn when the sanitary paper roll package was picked from both sides with one hand.
In the case of Comparative Example 2 in which the film thickness exceeded 45 μm, the cost of the sanitary paper roll package became high.
In the case of Comparative Example 3 in which the winding length was less than 15 m, the frequency of roll replacement increased.
In the case of Comparative Example 4 in which the winding length exceeded 60 m, the mass of the roll became large, and when the sanitary paper roll package was picked from both sides with one hand, the film was torn. In addition, the winding diameter DR exceeds 155 mm, making it difficult to fit in a roll holder or the like.

In the case of Comparative Example 5 in which the roll density exceeded 0.21 g / cm ³ , the film was torn when the sanitary paper roll package was picked from both sides with one hand. It is considered that this is because the roll is too tight, the roll is not easily deformed when the sanitary paper roll package is picked from both sides with one hand, and the acupressure is concentrated on one point to promote the generation of crevices.
In the case of Comparative Example 6 in which the roll density was less than 0.10 g / cm ³ , the winding diameter per winding length became excessive, and space saving during storage could not be achieved.

In the case of Comparative Example 7 in which the maximum amount of dent of the film was less than 4 mm, when the sanitary paper roll package was picked from both sides with one hand, acupressure was concentrated on one point of the film and the film was torn.
In Comparative Example 8 in which the maximum amount of dent of the film exceeded 25 mm, the package was loosened and the cosmeticity of the package was inferior.

When the commercial product 1 was evaluated in the same manner, the roll density was ^{less than 0.10 g / cm 3} , and space saving during storage could not be achieved.

2 Sanitary paper roll 4 film 10 Sanitary paper roll package L Roll axial direction P Perimeter direction S 1st ruler SL reference line R 2nd ruler Rw 2nd ruler width direction D Maximum dent amount of film

Claims (4)

It is a sanitary paper roll package made by caramel-wrapping an even number of sanitary paper rolls with a film.
The roll length of the sanitary paper roll is 15 to 60 m, the roll density is 0.10 to 0.21 g / cm ³ ,
The film has a thickness of 18 to 45 μm,
The sanitary paper rolls are arranged in two rows in a direction perpendicular to the axial direction and both end faces are aligned, and the film is folded and sealed on both end faces.
The sanitary paper roll package is placed so that the axial direction is horizontal, and straddles two rows of the sanitary paper rolls adjacent to each other in the direction perpendicular to the axial direction, and has a mass of 64 g, a thickness of 1.0 mm, a width of 25 mm, and a scale. Pass the first ruler made of stainless steel with a length of 300 mm, place it so that the plate surface is in contact with the film, and use it as a reference line.
Moreover, one long side of the first ruler is located at 25% of h from both ends of the height h of the sanitary paper roll package, and at three measurement points m in the center.
Next, the mass is 10 g, the thickness is 0.5 mm, the width is 15 mm, and the scale length is in contact with the long side at the position of each measurement point m on the film packaged across the two rows of sanitary paper rolls. When a 150 mm stainless steel second ruler is placed so that the width direction of the second ruler is perpendicular to the axial direction, the distance D from the reference line to the tip of the second ruler is defined as D.
The measurement point m is set on the front and back of one sanitary paper roll package, and the measurement is performed on five sanitary paper roll packages, and the maximum dent amount of the film measured by averaging the values of the distance D at a total of 30 points is 3. Sanitary paper roll package characterized by being ~ 25 mm. The sanitary paper roll package according to claim 1, wherein the film has a basis weight of 16 to 41 g / m ^2. Claim 1 or 2 in which the ratio represented by (total mass including the core of one row of the sanitary paper roll) / (thickness of the film) is 5.0 to 18.0 ((g) / (μm)). The listed sanitary paper roll package. The sanitary paper roll package according to any one of claims 1 to 3, wherein the film is made of polyethylene.

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