JP2018090270A - Sanitary paper roll package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sanitary paper roll package suppressing tearing of a film caramel-packaging a long-wound sanitary paper roll, excellent in aesthetic properties, and low in cost.SOLUTION: A sanitary paper roll package 10 is formed by caramel-packaging an even number of sanitary paper rolls 2 with a film 4, in which a winding length of the sanitary paper roll is 15-60 m, the roll density is 0.10-0.21 g/cm, the film thickness is 18-45 μm, the sanitary paper rolls are arranged in two rows in a direction P perpendicular to an axial direction L thereof, the sanitary paper roll package is placed so that the axial direction is horizontal, a first gage S is set by straddling the adjacent two rows of the sanitary paper rolls, a plate surface thereof is placed to be in contact with the film to serve as a reference line SL. Then, a second gage R is placed on the film packaging by straddling the two rows of the sanitary paper rolls in such a way that a width direction Rw of the second gage is perpendicular to the axial direction. At this time, a maximum recessed value D of the film measured as the distance from the reference line to the end of the second gage is 3-25 mm.SELECTED DRAWING: Figure 3

Description

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

A sanitary paper roll package in which a plurality of sanitary paper rolls such as toilet rolls and kitchen towels are caramel-wrapped with a film and a handle is 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, a film 120 between two sanitary paper rolls 110 arranged in the lateral direction without attaching a handle is indicated by an arrow. In some cases, you can pick it up from both sides with one hand.

Japanese Patent No. 4237035 Japanese Patent No. 5026165

By the way, in recent years, a compact roll with a long winding length has been demanded from the viewpoint of carrying and storage, and as the winding length is lengthened, the roll mass is also increased. It is getting bigger.
However, when the roll length of the sanitary paper roll is increased and the mass of the roll is increased, when the sanitary paper roll package 100 is picked from both sides with one hand as shown in FIG. 6, finger pressure is applied to the film 120 and a tear 120v is generated. There's a problem.
On the other hand, if the film is packaged loosely, the finger pressure escapes and does not concentrate on one point, so that the generation of a tear can be prevented, but the package is loosened and the cosmetic makeup of the package is inferior. Moreover, even if the film is thickened, tears are suppressed, but the cost increases.
Accordingly, an object of the present invention is to provide a low-cost sanitary paper roll package that suppresses tearing of a film in which a caramel-wrapped sanitary paper roll having a long roll length is torn and has excellent cosmetics.

  In order to suppress tearing of the film in which the sanitary paper roll is caramel-wrapped, the present inventors have prescribed the winding length and roll density of the sanitary paper roll, and have suppressed the film tearing by prescribing the degree of film slack. It was found that cosmetics can be secured.

That is, the sanitary paper roll package of the present invention is a sanitary paper roll package obtained by caramel-wrapping an even number of sanitary paper rolls with a film, wherein the sanitary paper roll has a roll length of 15 to 60 m and a roll density of 0.10 to 0. .21 g / cm ³ , the thickness of the film is 18 to 45 μm, the sanitary paper rolls are arranged in two rows in a direction perpendicular to the axial direction so that both end faces are aligned, and the film is folded on both end face sides The sanitary paper roll package is placed so that the axial direction is horizontal, and the two sanitary paper rolls adjacent to each other in the direction perpendicular to the axial direction are straddled. The first ruler made of stainless steel having a thickness of 0.0 mm, a width of 25 mm and a graduation length of 300 mm was handed over, and the plate surface was placed in contact with the film as a reference line. A stainless steel second ruler having a mass of 10 g, a thickness of 0.5 mm, a width of 15 mm and a graduation length of 150 mm is placed on the film packaged across the sanitary paper rolls in a row, and the width direction of the second ruler is the axis of the axis. When the film is placed so as to be perpendicular to the direction, the maximum dent amount of the film measured at a distance from the reference line to the tip of the second ruler is 3 to 25 mm.

The basis weight of the film is preferably 16 to 41 g / m ² .
It is preferable that the ratio represented by (total mass including core of one row of sanitary paper roll) / (thickness of the film) is 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 that is excellent in cosmetics while suppressing the tearing of a film in which a caramel-wrapped sanitary paper roll having a long winding length is torn.

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 the film in a sanitary paper roll package. It is another figure which shows the measuring method of the maximum dent amount of the 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 water absorption.

Preferred embodiments of the present invention will be described below, but these are given for illustrative purposes and do not limit the present invention.
As shown in FIG. 1, a sanitary paper roll package 10 according to an 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 rows and both end faces are aligned. The film 4 is folded and sealed by the flaps 4a and 4b on both end sides thereof.
Here, the sanitary paper rolls 2 being arranged in two horizontal rows means an arrangement in which the sanitary paper rolls 2 have the axes L parallel to each other and their outer surfaces are adjacent to each other and both end surfaces (upper surface and lower surface) are substantially aligned on the same plane. .

<Sanitary paper roll>
The sanitary paper roll 2 is exemplified by a kitchen towel, but is 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 . Thereby, the replacement frequency of the sanitary paper roll 2 is reduced, space saving at the time of storage is achieved, and generation of a tear 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 is shortened, and the roll replacement frequency is increased, and space saving during storage cannot be achieved. When the roll length exceeds 60 m, the mass of the roll increases, so that when the sanitary paper roll package 10 is picked from both sides with one hand, finger pressure 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.

When the roll density of the sanitary paper roll 2 is less than 0.10 g / cm ³ , the winding diameter per winding length is excessive, and space saving during storage cannot be achieved. When the roll density exceeds 0.21 g / cm ³ , the roll is too hard to roll, and when the sanitary paper roll package is picked from both sides with one hand, the roll is difficult to deform, and the finger pressure is concentrated on one point of the film. A tear occurs 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 .
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) ² −3.14 × (39 mm ÷ 2 ÷ 10) ² } × (207 mm ÷ 10)] = 0.15 g / cm ³ . The core (paper tube) diameter is the diameter of the roll center hole. When there is a core, it is the outer diameter of the core, and when there is no core, it is the diameter of the center hole of the roll 2. A core is preferable because the roll shape is stable when the roll is used.

The sanitary paper roll 2 is manufactured using a roll winding machine. There are two types of roll winding machines: a surface method and a center method. The surface method is a method in which the sanitary paper roll 2 to be wound is wound while being supported by a plurality of other driving rolls from the outside, 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 passing through the center of the winding roll. The wound sanitary paper roll 2 becomes a relatively soft product and is suitable for a product with delicate embossing. In addition, when embossing, the double embossing which is easy to improve water absorption is preferable. In the double embossing, nested embossing is preferable.
In the present invention, any method can be used for winding, but the surface method is preferred. According to the surface system, the winding diameter and roll density of the sanitary paper roll 2 can be adjusted relatively easily by the strength with which the sanitary paper roll 2 is wound. At this time, the pressing force of the rider roll for sequentially winding the sheets by pressing the sanitary paper roll 2 from the outer peripheral side can be adjusted by setting it within a predetermined range.

<Film>
The thickness of the film 4 is 18 to 45 μm.
When 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, finger pressure 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 or the like, the film tends not to tear easily. Among 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 still more preferably 23 to 29 g / m ² .
When 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, finger pressure is applied to the film 4 and a tear may occur.
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 still more preferably 0.7 to 1.1 g / cm ³ .
When 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, finger pressure is applied to the film 4 and a tear may occur.
If the density of the film 4 exceeds 1.3 g / cm ³ , the cost may increase.

The tensile strength in the circumferential direction of the film 4 is preferably 5.0 to 14.0 N / 10 mm, more preferably 6.5 to 12.0 N / 10 mm, and further preferably 7.5 to 10.5 N / 10 mm.
Here, the tensile strength in the circumferential direction of the film 4 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 out, and the tensile strength along the direction P (peripheral length direction) P perpendicular to the axial direction L is measured as shown in FIG. The circumferential direction is the reason that when the sanitary paper roll package 10 is picked from both sides with one hand, the film tears while spreading in the direction P as shown in FIG. This is because it is possible to suppress the tearing. In general, the MD direction of the film 4 is often set to the axial direction L. In this case, the strength in the circumferential direction of the film is weaker than the strength in the longitudinal direction (axial direction L). It is necessary to secure.

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

  Further, when measuring the tensile strength in the circumferential direction, the elongation to break is 500 to 1300%, preferably 600 to 1200%, 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, finger pressure is applied to the film 4 and a tear may occur. If the elongation to break exceeds 1200%, the cost may increase.

The tear strength in the axial direction L of the film 4 is preferably 0.06 to 0.30 N, more preferably 0.10 to 0.26 N, and still more preferably 0.14 to 0.22 N.
If the tear strength is less than 0.06 N, finger pressure may be applied to the film 4 when the sanitary paper roll package 10 is picked from both sides with one hand, which may cause a tear. If the tear strength exceeds 0.30 N, the cost may increase.
As described above, the MD direction of the film 4 is often set to the axial direction L. In this case, the tear strength in the axial direction L of the film 4 is about 1/10 to 1/1 of the tear strength in the circumferential direction P. As small as 60. Therefore, the tear strength in the axial direction L was defined. That is, the tear strength in the circumferential direction is about 10 times or more higher than the tear strength in the axial direction L, so there is no particular problem.
The 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 well known, and a film extending along one direction of the packaged body is wrapped around the packaged body in a direction crossing this direction, or packaged from one end in the axial direction of the film formed in a cylindrical shape in advance. Put your body. Then, two opposing flap-shaped sides of the film protruding from both ends of the package body are folded together, and then the other two opposing flap-like sides are folded together, and these folded portions are heated. Seal by fusion or the like.
And 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 has a slight amount. A slack portion 4s is generated.

<Degree of film slack>
As described above, when the roll length of the sanitary paper roll is increased and the mass of the roll is also increased, when the sanitary paper roll package is picked from both sides with one hand, finger pressure 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 cosmetics of the package will be inferior.
Therefore, by defining the degree of looseness of the film 4, cosmetics are ensured while suppressing film tearing.

The degree of looseness of the film 4 is measured as shown in FIGS.
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 (two in FIG. 1 and FIG. 3) adjacent in the lateral direction (that is, perpendicular to the axial direction L). The first ruler S made of stainless steel having a mass of 64 g, a thickness of 1.0 mm, a width of 25 mm, and a graduation length of 300 mm is passed across the sanitary paper roll 2 and placed so that the plate surface is in contact with the film 4. A surface (line) in contact with the film 4 is defined as a reference line SL.
Next, among the slack portions 4s of the film 4 wrapped across the two rows (two in FIG. 1 and FIG. 3) of the sanitary paper rolls 2 adjacent in the lateral direction, the center of the sanitary paper rolls 2 in each row is approximately in the center. A stainless steel second ruler R having a mass of 10 g, a thickness of 0.5 mm, a width of 15 mm, and a graduation length of 150 mm is placed on the top, and the width direction Rw of the second ruler R is parallel to the end face of the sanitary paper roll 2 (that is, the axial direction L 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 from the both ends of the height h of the sanitary paper roll package 10 at a position of 25% with respect to h, and at three central points (three measurement points m in FIG. 1). Moreover, it measures on the front and back about one package. This is performed for five sanitary paper roll packages 10, and the total distance D values of 30 locations are averaged and adopted as the maximum dent amount of the film.
As the first ruler S and the second ruler R, for example, “straight scale silver” of Shinwa Measurement Co., Ltd. can be used.

The maximum dent amount of the film thus measured is 3 to 25 mm.
When the maximum dent amount of the film is less than 3 mm, when the sanitary paper roll package 10 is picked from both sides with one hand, the finger pressure tends to concentrate on one point of the film 4 and a tear occurs. When the maximum dent amount of the film exceeds 25 mm, finger pressure escapes and the generation of a tear can be prevented, but the package is loosened and the cosmetic quality of the package is inferior.
The maximum dent amount of the film is preferably 4 to 20 mm, more preferably 6 to 15 mm.
Note that the thickness and width of the second ruler R simulate the thickness and width of the nail of the thumb and simulate a harsh situation where the package 10 is picked up with a little nail.

<Other characteristics of sanitary paper roll>
The ratio represented by (total mass (g) including one row of sanitary paper rolls (one in FIG. 1) core C) / (thickness of film 4 (μm)) is 5.0 to 18.0 ((g ) / (Μm)).
If the ratio is less than 5.0 ((g) / (μm)), the thickness of the film 4 with respect to the roll mass becomes excessive, leading to an increase in the cost of the sanitary paper roll package 10. On the other hand, when the 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 Finger pressure may be applied to the skin and tears may occur.
The ratio is preferably 6.5 to 15.5 ((g) / (μm)), more preferably 9.0 to 11.5 ((g) / (μm)).
In addition, as shown in FIG. 5, when there are four rolls, it is needless to say 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 still more preferably 111 to 130 mm.
It is preferable that the winding diameter DR is 83 to 155 mm because it is easy to fit in a roll holder or the like while making the winding length longer than 15 m. When the winding diameter DR is less than 83 mm, the winding length per roll is shortened, and the frequency of roll replacement may increase, or space saving during storage may not be achieved. When 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 still more 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. When the roll width (height) W exceeds 250 mm, the sheet is unnecessarily large 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 still more preferably 220 to 370 g.
If the mass is less than 110 g, the thickness of the film 4 with respect to the roll mass becomes excessive, 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 roll replacement frequency may be increased.
When the mass exceeds 550 g, the thickness of the film 4 with respect to the roll mass becomes too thin. When the sanitary paper roll package 10 is picked from both sides with one hand, finger pressure is applied to the film 4 and a tear may occur. In addition, the roll may become too large to fit in a 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 still more preferably 38 to 46 g / m ³ .
If the basis weight is less than 26 g / m ³ , the sheet may be easily broken or the water absorption may be inferior. When the basis weight exceeds 58 g / m ³ , the strength becomes excessively high or the bulk (bulk) becomes too high and the winding diameter DR exceeds 155 mm, which may be difficult to fit in a roll holder or the like. .

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 be difficult to fit in a roll holder or the like.
In addition, the specific volume is obtained by dividing the measured paper thickness by the basis weight and expressing the volume in cm 3 per unit g as described later.

The sheet thickness of the sheet constituting the sanitary paper roll 2 is preferably 1.0 to 3.2 mm / 10, more preferably 1.2 to 2.5 mm / 10, and even more preferably 1.4 to 2.0 mm. / 10 sheets.
If the sheet thickness is less than 1.0 mm / 10, the water absorption may be inferior. On the other hand, when 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 be difficult to fit in a roll holder or the like.

DMDT (Dry Machine Direction Tensile strength) is the vertical tensile strength during drying and DTDT (Dry Cross Direction Tensile strength) is the transverse tensile strength during drying based on JIS P8113. Is 11.0 to 27.0 N / 25 mm. Further, the DCDT of the sheet is preferably 3.0 to 11.0 N / 25 mm. In addition, DMDT and DCDT are measured on a sheet with the same number of product plies.
DMDT is more preferably 13.0 to 25.0 N / 25 mm, and further preferably 15.0 to 23.0 N / 25 mm. DCDT is more preferably 4.0 to 10.0 N / 25 mm, and still more preferably 5.0 to 9.0 N / 25 mm.
If DMDT and DCDT are less than the above values, water absorption may be reduced and blurring may occur. If DMDT and DCDT are higher than the above values, the cost may increase or the texture may become hard.
Note that the flow direction of sanitary paper (sheet) is “vertical direction”, and the direction perpendicular to the flow direction is “lateral direction”.

The water absorption of the sheet is in accordance with the water absorption of the old JIS-S3104 method. At a temperature of 23 ± 1 ° C and a humidity of 50 ± 2%, 0.1 ml of water is dropped on the sheet with the product ply number, and the water droplets on the sheet. Measure the time (in seconds) absorbed. The water absorption is preferably 1.0 to 5.0 seconds. In addition, even if it is a case where a water absorption is less than 1.0 second, it is regarded as 1.0 second. If the water absorption exceeds 5.0 seconds, the water absorption may be inferior. There is no particular problem even if the water absorption is less than 1.0 seconds. The water absorption is more preferably 1.0 to 4.0 seconds, and still more preferably 1.0 to 3.0 seconds.
It is preferable that the water absorption amount per sheet area of the product ply number is 105 to 250 Water-g / m ² . If the amount of water absorption is less than 105 Water-g / m ² , the water absorption may decrease, 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 water absorption per mass of the product ply sheet 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 decreases, and if it exceeds 5.4 Water-g / g, the basis weight and the paper thickness increase and the winding diameter DR also increases. It may become difficult to fit.
The water absorption is more preferably 3.2 to 4.9 Water-g / g, and still 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. If the basis weight is increased, Water-g / m ² is improved, but the cost is increased accordingly. Become 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 sheet thickness (specific volume) of the sheet is increased. Therefore, Water-g / g is also increased.
That is, by defining a suitable range of both Water-g / m ² and Water-g / g as a unit of water absorption, water absorption can be secured while achieving both cost and paper thickness (bulk).

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

Next, the holder and the test piece 200 are hung on a stick installed in an empty water tank with the corner 200a facing the corner 200d facing upward, and the lid of the water tank is closed and left for 30 minutes. Thereafter, the holder 220 and the test piece 200 are taken out of 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. From the mass change of the test piece 200 before and after being immersed in distilled water, the water absorption amount (Water-g / m ² ) of distilled water per 1 m ^{2 of} the test piece is calculated.
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 performed in accordance with JIS-P8111 method at a temperature of 23 ± 1 ° C. and a humidity of 50 ± 2%. Distilled water is kept at 23 ± 1 ° C.

It goes without saying that the present invention is not limited to the above-described embodiments, and extends to various modifications and equivalents included in the spirit and scope of the present invention.
As shown in FIG. 5, the number of sanitary paper rolls 2 packaged in the sanitary paper roll package is an even number other than two (four in FIG. 5) as long as two rows are arranged in a direction perpendicular to the axial direction L. May be. 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.

  A sanitary paper roll 2 made of a kitchen towel wound with a known surface type roll winding machine is manufactured by stacking sheets of pulp composition (mass%) of NBKP 50% and LBKP 50% on two plies, and two sanitary paper rolls 2 was caramel-wrapped with a polyethylene film 4 as shown in FIG.

The following evaluation was performed.
Basis weight: The sheet constituting the film 4 and the sanitary paper roll 2 was measured based on JIS P8124.
Paper thickness: The sheet constituting the sanitary paper roll 2 was measured using a thickness gauge (a dial thickness gauge “PEACOCK” manufactured by Ozaki Seisakusho). The measurement conditions were a measurement load of 3.7 kPa and a probe diameter of 30 mm. A sample was placed between the probe and the measurement table, and the gauge was read when the probe was lowered at a speed of 1 mm or less per second. In addition, 10 sheets (5 sets of 2 plies) were stacked for measurement. The measurement was repeated 10 times and the measurement results were averaged.
Longitudinal tensile strength during drying DMDT and transverse tensile strength during drying DCDT: Based on JIS P8113, the maximum load up to breakage was measured in units of N / 25 mm per sheet of product ply. The tensile speed was 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 as the volume cm ³ per unit g. Further, the basis weight of the film was divided by the thickness, and the density was expressed in 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 mass of the core was subtracted from the mass of the roll including the core to obtain a roll mass not including the core. The roll mass was obtained by measuring 10 rolls and averaging the measurement results.

Winding length: First, about the sheet | seat between the perforation of a roll, the length for 10 sheets was measured, and the average value was made into the length of 1 sheet | seat. Thereafter, the total number of sheets between the perforations of one roll was 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 was no perforation, the winding length was obtained by measuring the length of one roll.
Tensile strength in the circumferential direction of the film: measured by the method described above. In addition, the conditions of the tensile test conformed to JIS Z 1702. The test piece was dumbbell-shaped, 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 Corporation. The measurement measured 10 rolls and averaged the measurement results.
The roll density and the maximum dent amount of the film were measured by the methods described above.

Sensory evaluation was performed by 20 monitors. The evaluation standard was a perfect score. If the evaluation criteria is 3 points or more, it is good.
In addition, 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 direction and the maximum dent amount of the film were measured after maintaining the 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 each example where the roll length of the sanitary paper roll, the roll density, the film thickness, and the maximum dent amount of the film are defined within a predetermined range, the caramel-wrapped film is torn. It was possible to obtain a low-cost sanitary paper roll package that was suppressed and excellent in cosmetics.

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 roll replacement frequency increased.
In the case of Comparative Example 4 in which the winding length exceeded 60 m, the mass of the roll increased, and when the sanitary paper roll package was picked from both sides with one hand, the film was torn. Moreover, the winding diameter DR exceeded 155 mm, and it was 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. This is thought to be because the roll was too hard and the roll was difficult to deform when the sanitary paper roll package was picked from both sides with one hand, and the finger pressure was concentrated on one point to promote the generation of tears.
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 was excessive, and space saving during storage could not be achieved.

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

In addition, when the commercial product 1 was similarly evaluated, 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 Circumferential direction S First ruler SL Reference line R Second ruler Rw Width direction of the second ruler D Maximum dent amount of film

Claims (4)

A sanitary paper roll package in which an even number of sanitary paper rolls are caramel-wrapped 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 thickness of the film is 18 to 45 μm,
The sanitary paper rolls are arranged in two rows in a direction perpendicular to the axial direction so that both end faces are aligned, and the film is folded and sealed at both end face sides,
The sanitary paper roll package is placed so that the axial direction is horizontal, and spans 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 and place the plate surface in contact with the film as a reference line,
Next, a stainless steel second ruler 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 film wrapped across the two rows of sanitary paper rolls, and the width of the second ruler. The sanitary paper has a maximum dent amount of 3 to 25 mm measured at a distance from the reference line to the tip of the second ruler when placed so that the direction is perpendicular to the axial direction. Roll package. Sanitary paper roll package of claim 1, wherein the basis weight of said film is 16~41g / ^{m 2.}   The ratio represented by (total mass including the core of one row of sanitary paper rolls) / (thickness of the film) is 5.0 to 18.0 ((g) / (μm)). Sanitary paper roll package as described.   The sanitary paper roll package according to any one of claims 1 to 3, wherein the film is made of polyethylene.