JP6996044B2 - Toilet roll for shower toilet - Google Patents

Description

The present invention relates to a shower toilet toilet roll in which toilet paper laminated in two plies is wound into a roll.

In recent years, shower toilets have become widespread in Japan, and toilet rolls for shower toilets, which are made by winding toilet paper laminated in two plies into a roll, have also been put on the market. Usually, the toilet paper constituting the toilet roll for a shower toilet is required to have a large amount of water absorption and is not easily torn. Therefore, in shower toilet toilet paper, a method of creating an air layer between sheets by so-called double embossing, in which each base paper of 2 plies is individually embossed, is generally used to increase the water absorption of the toilet paper. It is used.

Regardless of whether it is for shower toilets or not, in order to ensure texture, ease of wiping, water absorption, etc., double embossed toilet paper has been studied. For example, Patent Document 1 describes a toilet roll having a double embossing process and having a winding density of 0.820 m / cm ² or more and 0.970 m / cm ² or less. It has been disclosed. Further, Patent Document 2 is characterized by having a two-ply structure in which a pair of paper sheets having the same embossing pattern are joined together so that the embossed convex surfaces of the paper sheets face each other in close proximity to each other. The above toilet rolls are disclosed. Further, in Patent Document 3, in a toilet roll in which two or more sheets of tissue paper are stacked, at least one sheet of tissue paper has embossing, and an adhesive applied to the top of the convex portion of the embossing is applied to the adjacent tissue paper. Disclosed is a toilet roll that is adhered and is characterized in that the adhesive used for adhering the thin papers to each other is an aqueous adhesive base colored with an aqueous colorant.

Japanese Patent Application Laid-Open No. 2003-199687 Japanese Patent Application Laid-Open No. 2003-116741 Japanese Unexamined Patent Publication No. 2009-178454

However, with double-embossed toilet rolls, the roll must be rolled up gently so that the embossing is not crushed and the paper thickness does not decrease. Sometimes it couldn't fit in the toilet paper holder. Therefore, the shower / toilet toilet roll has a problem that the winding length is shorter and the roll replacement frequency is higher than that of a normal toilet roll.

In addition, with double-embossed toilet paper, tension is applied when the toilet paper is wound up in the toilet roll manufacturing process, the embossing is crushed, and the air layer between the sheets tends to shrink, resulting in toilet paper. There is a problem that the amount of water absorption is reduced and the fluffy texture peculiar to double embossed toilet paper is also impaired.

Furthermore, when using a shower toilet, it will be wiped off with more water than when using a normal toilet that is not a shower toilet, so torn toilet paper may stick to the skin, and it feels good to use. I was not completely satisfied with the above.

Therefore, the present invention has been made in view of the above problems, and provides a toilet roll for a shower / toilet, which has good water absorption and feel, is suppressed from sticking to the skin, and has a low replacement frequency. With the goal.

The inventors of the present invention have conducted diligent research in order to solve the above problems. As a result, they have found that the above problems can be solved by adjusting the basis weight, paper thickness and specific parameters of toilet paper, and have completed the present invention. Specifically, the present invention provides the following.

(1) The first aspect of the present invention is a toilet roll in which toilet paper laminated in two plies and having an embossed pattern is wound into a roll, and the embossed pattern is provided in each of the two plies. It is a double embossed pattern, and the basis weight per sheet of toilet paper is 13 g / m ² or more and 22 g / m ² or less, and the paper thickness is 1.20 mm / 10 sheets or more and 1.90 mm / 10 sheets or less. , DGMT of 200 gf / 25 mm or more and 400 gf / 25 mm or less, which is the square root of the product of the vertical tensile strength DMDT during drying and the horizontal tensile strength DCDT during drying based on JIS P8113 of toilet paper. Yes, the ply peeling strength of the toilet paper is 5.0 cN / 114 mm or more and 30.0 cN / 114 mm or less, which is a toilet roll for a shower toilet.

(2) The second aspect of the present invention is the toilet roll for shower toilet according to (1), in which the depth of the embossed pattern on the front surface and the back surface of the same portion of the toilet paper is measured, and the measured value is large. When the depth of the embossed pattern of the surface is the depth A and the depth of the embossed pattern of the surface having a small measured value is the depth B, the depth A is provided on the condition that the depth A> the depth B is satisfied. It is characterized in that the depth B is 60 μm or more and 240 μm or less, and the thickness of the air layer between the two-ply sheets is 40 μm or more and 190 μm or less.

(3) The third aspect of the present invention is the shower toilet toilet roll according to (1) or (2), wherein the water absorption amount per 1 g of toilet paper is 10 ml or more and 20 ml or less. It is a thing.

(4) The fourth aspect of the present invention is the toilet roll for the shower toilet according to any one of (1) to (3), wherein the embossing pattern has two types, decoration embossing and micro embossing having different areas. The area per piece of decoration embossing is larger than the area per piece of micro embossing, and the total area ratio of decoration embossing to the total area of micro embossing in the unit area of toilet paper is 0.5. It is characterized in that it is 1.9 or less.

(5) A fifth aspect of the present invention is the toilet roll for shower toilet according to any one of (1) to (4), wherein the area of each decoration emboss is 0.7 mm ² or more. It is 3 mm ² or less, the total area ratio of decoration embossing per unit area of toilet paper is 4% or more and 15% or less, and the area per micro emboss is 0.10 mm ² or more and 0.50 mm ² or less. The total area ratio of micro-embossing per unit area of toilet paper is 3% or more and 12% or less.

(6) The sixth aspect of the present invention is the toilet roll for shower toilet according to any one of (1) to (5), which contains 20% by mass or more and 60% by mass or less of coniferous bleached kraft pulp. It is characterized by containing 40% by mass or more and 80% by mass or less of hardwood bleached kraft pulp.

(7) The seventh aspect of the present invention is the shower toilet toilet roll according to any one of (1) to (6), wherein the winding length is 25 m or more and 100 m or less, and the winding diameter is 104 mm or more and 130 mm or less. It is characterized by being.

(8) The eighth aspect of the present invention is the toilet roll for shower toilet according to any one of (1) to (7), wherein the softness TS7 by the tissue softness measuring device TSA of toilet paper is 11 dBV. It is characterized in that the smoothness ^TS750 is 16 dBV or ^more and 40 dBV ² rms or less, and the rigidity D is ^2.2 mm / N or more and 3.4 mm / N or less.

According to the present invention, it is possible to provide a toilet roll for a shower / toilet, which has good water absorption and feel, suppresses sticking to the skin, and has a low replacement frequency.

It is a perspective view which shows the appearance of the toilet roll for a shower toilet of this invention. It is a figure which shows the state which the sheet provided with the embossing pattern is laminated in 2 plies. It is a schematic diagram which shows the mode of the embossing pattern. It is a figure which shows the measuring method of the depth of the embossing pattern. It is a figure which shows the measuring method of the depth of the embossing pattern. It is a figure which shows the measuring method of the depth of the embossing pattern. It is a figure which shows the image which captured the surface of the toilet paper by an image scanner. It is a figure which shows the process of embossing. It is a figure which shows the photographed image of the defective product which the inner winding side of a roll protruded in the axial direction.

Hereinafter, embodiments of the present invention will be described in detail, but the following embodiments are presented for purposes of illustration, and the present invention is not limited to the embodiments shown below.

<Toilet roll for shower toilet>
FIG. 1 is a perspective view showing the appearance of the toilet roll 1 for a shower toilet of the present invention, and FIG. 2 is a view showing a state in which sheets provided with embossed patterns are laminated in two plies. As shown in FIG. 1, the toilet roll 1 for a shower toilet of the present invention is a toilet roll in which toilet paper 1x laminated in two plies and having an embossed pattern is wound into a roll, and the embossed pattern is a toilet roll. It is a double embossing pattern provided for each of the two plies, and the basis weight per sheet of toilet paper 1x is 13 g / m ² or more and 22 g / m ² or less, and the paper thickness is 1.20 mm / 10 sheets or more. DGMT, which is 90 mm / 10 sheets or less and is the square root of the product of the vertical tensile strength DMDT during drying and the horizontal tensile strength DCDT during drying based on JIS P8113 of toilet paper 1x, is 200 gf. It is / 25 mm or more and 400 gf / 25 mm or less, and the ply peeling strength of the toilet paper 1x is 5.0 cN / 114 mm or more and 30.0 cN / 114 mm or less.

Further, among the surfaces of the toilet paper 1x, the surface facing the outside of the roll is referred to as the surface 1a (the surface of the toilet paper 1x), and the surface facing the center of the roll is referred to as the back surface 1b (the back surface of the toilet paper 1x).

[Volume length, winding diameter]
It is preferable that the winding length of the shower / toilet toilet roll 1 is 25 m or more and 100 m or less, and the winding diameter DR is 104 mm or more and 130 mm or less. By adjusting the winding length and winding diameter DR within the above ranges, the frequency of replacement of the shower / toilet toilet roll 1 can be reduced, and the shower / toilet toilet roll 1 can be easily accommodated in the toilet paper holder. Further, by setting the winding diameter DR within the above range, a high-class appearance can be obtained. The winding length is 35m or more and 85m or less, and the winding diameter DR is 107mm or more and 125mm in order to reduce the frequency of replacing the toilet roll 1 for shower toilets, to easily accommodate it in the toilet paper holder, and to give it a luxurious appearance. It is more preferable that the winding length is 45 m or more and 75 m or less, and the winding diameter DR is 110 mm or more and 120 mm or less.

Here, if the winding length and winding diameter DR deviate from the above ranges and the roll is wound too tightly, excessive pressure is applied to the inner winding toilet paper 1x, and the embossing provided on the inner winding toilet paper 1x is crushed. , The beauty is reduced when used. On the other hand, if the roll is wound too weakly, the embossing will not be crushed, but the winding diameter DR will become large, making it difficult to attach the shower toilet toilet roll 1 to the toilet paper holder, or the winding force of the inner winding will be weak. As shown in the photograph of FIG. 9, the inner winding side of the roll protrudes in the axial direction, resulting in a defective product.

[Basis weight]
The basis weight per sheet of toilet paper 1x is 13 g / m ² or more and 22 g / m ² or less, and the paper thickness at this time is 1.20 mm / 10 sheets or more and 1.90 mm / 10 sheets or less. When the basis weight and the paper thickness are in the above ranges, it becomes easy to adjust the winding length and the winding diameter DR to the above ranges. As a method of adjusting the basis weight and paper thickness per sheet of toilet paper 1x within the above range, the calendar conditions (paper thickness and specific volume after calendar processing, paper thickness difference before and after calendar processing) and embossing conditions of the base paper web are used. Can be mentioned as a method of defining.

When the basis weight and the paper thickness per sheet of the toilet paper 1x are within the above ranges, the strength and usability (bulkness) of the toilet paper 1x are suitably maintained, and the toilet paper 1x is rolled. The diameter DR is also maintained within an appropriate range, making it easier to fit in the toilet paper holder. In addition, it is possible to obtain a toilet paper 1x and a toilet roll 1 for a shower / toilet, which have a voluminous feel and are not very stiff. The basis weight per sheet of toilet paper 1x is preferably 14 g / m ² or more and 19 g / m ² or less, and more preferably 15 g / m ² or more and 17 g / m ² or less. The thickness of the toilet paper 1x is preferably 1.30 mm / 10 sheets or more and 1.80 mm / 10 sheets or less, and more preferably 1.40 mm / 10 sheets or more and 1.70 mm / 10 sheets or less.

[Embossed pattern]
The toilet roll 1 for a shower toilet (toilet paper 1x) of the present invention is embossed and has an embossed pattern. Further, in the embossing pattern in the present invention, after embossing each sheet of toilet paper 1x, as shown in FIG. 2, the convex portion of one sheet and the concave portion of the other sheet are laminated so as to overlap in the thickness direction. It is a so-called nested double embossing that makes two plies. In the toilet paper 1x, as described later, the depth of the embossed pattern on the front surface 1a and the back surface 1b of the same portion of the toilet paper 1x is measured, and the depth of the embossed pattern on the surface having a large measured value is the depth A, the measured value. When the depth of the embossed pattern on the small surface is set to depth B, in order to satisfy the condition of depth A> depth B, as shown in FIG. 2, the convex surface of one sheet and the other sheet By creating an air layer between the surface of the recess and the surface of the recess, the amount of water absorbed by the toilet paper 1x can be increased, and a toilet roll 1 for a shower toilet suitable for a shower toilet can be obtained. Further, when stacking two plies, ply bond glue (glue) or knurling (edge embossing) can be used, but from the viewpoint of embossing resistance to crushing, it is preferable to use ply bond glue. From the viewpoint of cosmetics, it is preferable to color the ply bond glue with pigment ink. Further, when the nested double embossing method is used, the ply peeling strength described later becomes high, and the phenomenon that the toilet paper sticks to the skin can be suppressed.

(Depth of embossed pattern)
The depth of the embossed pattern on the front surface 1a and the back surface 1b of the same part of the toilet roll 1 for shower / toilet (toilet paper 1x) is measured, the depth of the embossed pattern on the surface with the large measured value is the depth A, and the measured value is small. When the depth of the embossed pattern of the surface is the depth B, the depth A is 130 μm or more and 400 μm or less and the depth B is 60 μm or more and 240 μm or less on condition that the depth A> the depth B is satisfied. Is preferable. By adjusting the depth of the embossed pattern within the above range, the degree of unevenness of the embossed pattern is appropriately maintained, the bulk of the toilet paper 1x becomes appropriate, and the softness of the sheet can be appropriately maintained. It is possible to obtain a toilet roll 1 for a shower / toilet that has a good touch with less roughness. It is more preferable that the depth A is 160 μm or more and 340 μm or less, the depth B is 80 μm or more and 200 μm or less, and the depth A is 190 μm or more and 270 μm or less, provided that the depth A> the depth B is satisfied. It is more preferable that B is 100 μm or more and 160 μm or less.

As shown in FIG. 8, the depth of the embossing pattern can be controlled by appropriately adjusting the nip width of the rubber roll 4 facing the embossing roll 3 in the embossing process. The nip width varies depending on the characteristics of the roll, but is preferably 20 mm or more and 50 mm or less, more preferably 25 mm or more and 45 mm or less, and further preferably 30 mm or more and 40 mm or less. By adjusting the nip width within the above range, the difference between the front and back sides of the embossed pattern is appropriately maintained, and the paper thickness and the softness of the sheet are suitably maintained. The nip width can be measured using carbon paper. As a measuring method, first, the nip of the embossed roll 3 is released, and carbon paper and general copy paper are placed on top of each other and set. Next, the emboss roll 3 is niped. After that, let the nip escape and remove the carbon paper and copy paper. Since the color of the carbon paper in the portion where the nip is applied by the emboss roll 3 is transferred to the copy paper, the nip width can be measured. The material of the embossed roll 3 is preferably metal. The depth of the embossing pattern can be adjusted by narrowing the nip width if the unevenness of the embossing roll 3 is deep and widening the nip width if the unevenness of the embossing roll 3 is shallow.

The depth of the embossed pattern is determined by measuring the height difference of the embossed pattern using a microscope. As described above, the depth of the embossed pattern on the front surface 1a and the back surface 1b of the same portion of the toilet paper 1x is measured, the depth of the embossed pattern on the surface having a large measured value is the depth A, and the depth of the embossed pattern on the surface having a small measured value is the depth A. Let the depth of the embossed pattern be the depth B.

As the microscope, the product name "One-shot 3D measurement macroscope VR-3100" manufactured by KEYENCE Co., Ltd. can be used. The product name "VR-H1A" can be used as the image observation / measurement / image analysis software of the microscope. The measurement is performed under the conditions of a magnification of 12 times and a visual field area of 24 mm × 18 mm. The measurement magnification and the visual field area may be appropriately changed depending on the size of the desired embossed pattern.

First, as shown in FIG. 4, the longest portion a of the peripheral edge fr of the embossed pattern is obtained. FIG. 5A shows the height profile on the XY plane by the microscope, and it can be seen that the height of the toilet paper 1x surface is represented by shading. The dark-colored portion in FIG. 5 (a) shows an individual embossed pattern, and the longest portion a of one embossed pattern can be distinguished from FIG. 5 (a). By drawing the line segments AB crossing the longest portion a, the height (measurement cross-sectional curve) profile of the embossed pattern is obtained as shown in FIG. 5 (b). Here, since the convex portion (non-embossed portion) and the concave portion of the embossed pattern can be seen from the shade of color of the XY plane image, the line segment AB is drawn so as to cross the portion where the convex portion and the concave portion are adjacent to each other. You just have to decide.

Here, the height profile of FIG. 5B is a (measured) cross-sectional curve T representing the unevenness of the sample surface of the actual toilet paper 1x, but noise (fiber lumps are present on the surface of the toilet paper 1x, etc. The fibers are elongated in a whisker shape or include steep peaks caused by a portion without fibers), and it is necessary to remove such noise peaks when calculating the height difference of the unevenness. Therefore, as shown in FIG. 6, the "contour curve" U is calculated from the cross-sectional curve T of the height profile, and of the "contour curve" U, the two maximum curvature points that are convex upward toward the inside of the embossing. The minimum value of the region sandwiched between P1 and P2 and the maximum curvature points P1 and P2 is obtained, and the minimum value is Min. Further, the average value of the values of the maximum curvature points P1 and P2 is defined as the maximum value Max.

In this way, the depth of the embossed pattern is defined as the maximum value Max-minimum value Min, and the distance (length) of the maximum curvature points P1 and P2 on the XY plane is defined as the length of the longest portion a. The "contour curve" U is λc: 800 μm from the cross-sectional curve T (however, λc is a filter that defines the boundary between the roughness component and the waviness component described in JIS-B0601 “3.1.1.2”. It is a curve obtained by removing the component of the surface roughness of a shorter wavelength by a low frequency filter. If λc is set to be equal to or larger than the P1 spacing between adjacent embossed patterns (this is called embossing pitch), the peak may be recognized as noise, so λc is set to be less than the embossing pitch. For example, when the embossing pitch is 800 μm or less, for example, λc: 250 μm is set. For the spacing of P1 between adjacent embossed patterns, P1 and P2 are similarly obtained for the next embossed pattern connected to the left or right in FIG. 6, and two P1s when the adjacent embossed patterns are lined up with P1, P2, and P1. The interval between.

Similarly, in FIG. 5A, the depth of the embossed pattern is measured for the longest portion b in the direction perpendicular to the longest portion a, and the larger of the depths of the embossed patterns of the longest portions a and b is larger. The value of is adopted as the depth of the embossed pattern. The above measurement was performed on the surface of the toilet paper 1x at a predetermined position corresponding to the winding length of 20% of the shower toilet toilet roll 1 from the edge 1e of the outermost volume of the toilet paper 1x for the shower toilet. It is performed for any 10 embossing patterns of 1a and the back surface 1b, and the average value is adopted as the depth of the embossing pattern of each of the front surface 1a and the back surface 1b of the toilet paper 1x. The depth of the embossed pattern is defined as the depth A, and the depth of the embossed pattern on the surface having a small measured value is defined as the depth B. For the longest part a and the longest part b, the values obtained by averaging the values of individual a and b for the 10 embossed patterns of the toilet paper 1x described above are used.

(Type and area of embossing)
In the shower toilet toilet roll 1 (toilet paper 1x) of the present invention, as shown in FIG. 3, the embossing pattern is composed of two types of embossing, decoration embossing 2a and micro embossing 2b, which have different areas. The area per piece is larger than the area per piece of micro-emboss 2b, and the total area ratio of decoration emboss 2a to the total area of micro emboss 2b in the unit area of toilet paper 1x is 0.5 or more and 1.9 or less. Is preferable. As shown in FIG. 3, the embossing pattern is configured to surround a plurality of micro-embossing 2b with a plurality of decoration embossing 2a, and the shape formed by the plurality of decoration embossing 2a is circular as shown in FIG. It may be an oval shape, a polygonal shape, a flower pattern, a leaf pattern, a star pattern, or the like, and is not particularly limited. The shape formed by the plurality of decoration embosses 2a may be a single type or a plurality of types. By adjusting the total area ratio of the decoration embossing 2a to the total area of the micro-embossing 2b in the unit area of the toilet paper 1x within the above range, even if the paper is tensioned when it is molded into the toilet roll 1 for shower toilet. The proper embossing depth is maintained, and at the same time the air layer between the base papers is maintained. As a result, the amount of water absorption required for the shower / toilet toilet roll 1 can be maintained. Further, the total area ratio of the decoration embossed 2a to the total area of the microembossed 2b in the unit area of the toilet paper 1x is more preferably 0.7 or more and 1.7 or less, and 1.0 or more and 1.4 or less. It is more preferable to have. The shape of each embossing unit may be circular, oval, rectangular, square, floral, or the like, without particular limitation.

The area per piece of decoration embossing 2a is preferably 0.7 mm ² or more and 2.3 mm ² or less, and the total area ratio of decoration embossing 2a per unit area of toilet paper 1x is preferably 4% or more and 15% or less. .. By adjusting the area per piece of the decoration emboss 2a and the total area ratio within the above range, the total area ratio of the decoration emboss 2a to the total area of the micro emboss 2b is properly maintained, and the decoration emboss 2a is formed into a toilet roll 1 for a shower toilet. Even if the paper is tensioned at that time, the proper embossing depth is maintained, and at the same time, the air layer between the base papers is maintained. As a result, the amount of water absorption required for the shower / toilet toilet roll 1 can be maintained. Further, the area per decoration embossed 2a is more preferably 0.9 mm ² or more and 2.1 mm ² or less, and further preferably 1.1 mm ² or more and 1.9 mm ² or less. The total area ratio of the decoration embossed 2a per unit area of the toilet paper 1x is more preferably 5% or more and 12% or less, and further preferably 6% or more and 9% or less.

The area per micro-embossed 2b is preferably 0.10 mm ² or more and 0.50 mm ² or less, and the total area ratio of the micro-embossed 2b per unit area of the toilet paper 1x is preferably 3% or more and 12% or less. .. By adjusting the area per piece of the micro-emboss 2b and the total area ratio within the above range, the total area ratio of the decoration emboss 2a to the total area of the micro emboss 2b is properly maintained, and the molding is formed into the toilet roll 1 for the shower toilet. Even if the paper is tensioned at that time, the proper embossing depth is maintained, and at the same time, the air layer between the base papers is maintained. As a result, the amount of water absorption required for the shower / toilet toilet roll 1 can be maintained. Further, the area per micro-emboss 2b is more preferably 0.15 mm ² or more and 0.45 mm ² or less, and further preferably 0.20 mm ² or more and 0.40 mm ² or less. The total area ratio of the micro-embossed 2b per unit area of the toilet paper 1x is more preferably 4% or more and 11% or less, and further preferably 5% or more and 10% or less.

The ratio of the total area of decoration embossing 2a to the total area of micro-embossing 2b in the unit area of toilet paper 1x, the area per piece of decoration embossing 2a and micro-embossing 2b, and the micro-embossing 2b and decoration per unit area of toilet paper 1x. The total area ratio of the embossed 2a can be measured as follows.

For the area of each emboss and the total area ratio of each emboss per unit area of the toilet paper 1x, the surface 1a of the toilet paper 1x is image-analyzed, and the dark part below a predetermined threshold is regarded as the recess of the emboss. It is obtained by measuring the area and further calculating the total area ratio. Specifically, the surface of the toilet paper 1x at a predetermined position corresponding to the winding length of 20% of the shower toilet toilet roll 1 from the edge 1e of the outermost winding toilet paper 1x of the shower toilet toilet roll 1. 1a is captured as image data as shown in FIG. 7 with a commercially available image scanner (for example, GT-X770 manufactured by Seiko Epson Corporation), and a predetermined image analysis device (for example, “Toilet paper” manufactured by Nippon Paper Unitech Co., Ltd.) is used. A measuring device (Easy Scan) ”) is used to obtain the area and total area ratio of the dark part below a predetermined threshold under the conditions of a resolution of 800 dpi and a scan area of 4 cm × 4 cm. Here, the above threshold value is set to 98%, which is close to the white side when black is 0 bit and white is 255 bits, and image processing is performed, and each dark portion (shadow portion) obtained is particles (miscellaneous matter). The particle size (equivalent to a circle) (μm) is measured. Then, the areas of the particles representing the micro-embossed 2b and the decoration embossed 2a were measured. The micro-emboss 2b and the decoration emboss 2a are distinguished by visual confirmation on the image, the area of each 100 embosses that are not covered with the printed portion is measured, and the average value is the average value of the decoration emboss 2a and the micro emboss 2b. The area per piece was used. Further, the area of each emboss is integrated and converted into the total area ratio of the dark part (recess) per 1 m ² of the image area (for example, when the measured area is 0.0016 m ² and the integrated area of the particles representing emboss is 200 mm ² ). , The total area ratio (%) is 200 mm ² ÷ 0.0016 m ² × 100 = 12.5%). Although the floral pattern is shown in FIGS. 7 and 9, the floral pattern is printed and is not the embossed pattern which is the configuration of the present invention.

The area and total area ratio of each emboss are measured along one side of the toilet paper 1x in the direction in which the scanner light travels so that wrinkles, perforations, creases, etc. do not appear in the toilet paper 1x sample. Install them together and capture the image data.

If the scan area (0.0016m ² ) of 4cm x 4cm cannot be secured due to perforations or creases in the toilet paper 1x sample, the measurement area to be measured at one time may be reduced. In this case, increase the number of measurement points so that the measurement area is at least 0.0016 m ² . For example, if 2 cm × 4 cm (0.0008 m ² ) is measured at two points, the measured area is 0.0016 m ² .

The total area ratio of the decoration embossed 2a to the total area of the micro-embossed 2b in the unit area of the toilet paper 1x is the formula of the total area ratio of the decoration embossed 2a / the total area ratio of the micro-embossed 2b per the unit area of the toilet paper 1x. Can be calculated with.

[Thickness of air layer]
In the shower toilet toilet roll 1 (toilet paper 1x) of the present invention, the thickness of the air layer between the two-ply sheets is preferably 40 μm or more and 190 μm or less. Here, as described above, in the embossing pattern in the present invention, after embossing each sheet of toilet paper 1x, as shown in FIG. 2, the convex portion of one sheet and the concave portion of the other sheet are in the thickness direction. It is a so-called nested type double embossing in which two plies are laminated so as to overlap each other. Further, as described above, the depth of the embossed pattern on the front surface 1a and the back surface 1b of the same portion of the toilet paper 1x is measured, and the depth of the embossed pattern on the surface having a large measured value is set to the depth A and the depth of the embossed pattern on the surface having a small measured value. When the depth of the embossed pattern is set to depth B, in order to satisfy the condition of depth A> depth B, as shown in FIG. 2, the surface of the convex portion of one sheet and the surface of the concave portion of the other sheet An air layer can be created between them. In this specification, the thickness of the air layer is a value calculated by the formula of depth A-depth B. By adjusting the thickness of the air layer within the above range, the surface area of the sheet can be increased, the water absorption can be improved, and the fluffy feel can be improved. Further, it is possible to prevent the 2-ply sheet from peeling off. The thickness of the air layer between the two-ply sheets is more preferably 60 μm or more and 160 μm or less, and even more preferably 80 μm or more and 130 μm or less. note that,

[Water absorption]
In the present invention, the amount of water absorption per 1 g of toilet paper 1x is preferably 10 ml or more and 20 ml or less. By adjusting the amount of water absorption within the above range, a toilet roll 1 for a shower toilet having excellent water absorption can be obtained. The water absorption amount is more preferably 12 ml or more and 20 ml or less, and further preferably 14 ml or more and 20 ml or less.

The amount of water absorption can be measured by the following method. First, the toilet roll 1 for a shower toilet is stored for 24 hours or more in an environment of a temperature of 23 ° C. and a humidity of 50%. Next, the shower / toilet toilet roll 1 is cut at a position of 1140 mm from the edge 1e of the outermost winding toilet paper 1x of the shower / toilet toilet roll 1, and folded evenly so that 10 2-ply sheets overlap. Weigh. Then, after immersing it in a bat filled with distilled water in advance for 10 seconds, it is lifted up on a stainless steel net (wire diameter 0.6 mm, mesh gap 2 mm) that does not absorb water and allowed to stand, and excess water is left for 60 seconds. The amount of water absorbed per 1 g of toilet paper is calculated from the weight of the toilet paper before immersion and the weight of the absorbed toilet paper after immersion. All of the above work shall be performed in an environment with a temperature of 23 ° C. and a humidity of 50%.

[Core outer diameter]
Further, the core outer diameter DI, which is the outer diameter of the core of the shower toilet roll 1 of the present invention, is preferably 25 mm or more and 48 mm or less, more preferably 35 mm or more and 46 mm or less, and 37 mm or more and 43 mm or less. Is more preferable. Since the core outer diameter DI is within the above range, the shower toilet toilet roll 1 can be easily fitted in the toilet paper holder while the winding density of the shower toilet toilet roll 1 can be suitably maintained. In addition, the handleability of the shower toilet roll 1 at the time of manufacture is also improved. The mass of the core of the shower / toilet roll 1 is preferably 2.8 g or more and 5.5 g or less, more preferably 3.5 g or more and 5.0 g or less, and 4.0 g or more and 4.6 g or less. Is more preferable. By setting the core mass in the above range, it is possible to realize good core strength and core cost suitable for a long shower toilet toilet roll 1 as in the present application. The mass of the core is the mass of the roll width of 114 mm, and the mass of the core other than 114 mm can be calculated by proportional calculation.

[Specific volume]
The specific volume of the toilet paper 1x is preferably 7.5 cm ³ / g or more and 12.0 cm ³ / g or less. When the specific volume of the toilet paper 1x is in the above range, the softness of the sheet becomes good, the bulk (bulkness) is preferably maintained, the water absorption is well maintained, and the winding diameter is maintained. DR does not become too large. The specific volume is more preferably 8.0 cm ³ / g or more and 11.3 cm ³ / g or less, and further preferably 8.5 cm ³ / g or more and 10.7 cm ³ / g or less.

[DGMT]
Vertical tensile strength DMDT (Dry Machine Direction) of toilet paper 1x (sheet laminated in 2 plies) at the time of drying based on JIS P8113.
Tensile Strength) and lateral tensile strength DCDT (Dry) during drying
DGMT (Dry Geometry Tensile Strength), which is the square root of the product of Cross Direction Tensile Strength, is 200 gf / 25 mm or more and 400 gf / 25 mm or less. When the DGMT is in the above range, the sheet is less likely to be torn and the toughness of the paper when touched is also good. The tensile strength is measured under the condition of a tensile speed of 300 mm / min. Further, the tensile strength can be adjusted by a known method. The DGMT is preferably 230 gf / 25 mm or more and 370 gf / 25 mm or less, and more preferably 250 gf / 25 mm or more and 350 gf / 25 mm or less.

In the above, the flow direction of the papermaking of the toilet paper 1x is defined as the “vertical direction”, and the direction perpendicular to the flow direction is defined as the “horizontal direction”.

[Ply peel strength]
The ply peeling strength of the toilet paper 1x is 5.0 cN / 114 mm or more and 30.0 cN / 114 mm or less. By adjusting the ply peeling strength to the above range, the toilet paper does not become too hard and can maintain a good touch, and it is possible to prevent the torn toilet paper from sticking to the skin. The ply peel strength is measured according to the tensile test method of JIS P 8113. It shall be cut to a width of 114 mm in the vertical direction under the standard conditions specified in JIS P 8111. After cutting, the sample is peeled in the vertical direction, and for the load cell for peeling test (STB-1255S, manufactured by A & D Co., Ltd.), one of the peeled pieces is used as the upper gripper and the other is used as the lower side. Fix each to the gripping tool, and set the interval to 8 cm. Next, it is pulled in the vertical direction at a speed of 100 mm / min and further peeled by 5 cm (for 30 seconds), and the strength at that time is measured. The ply peel strength is measured every 0.01 seconds, and the average value of the measured values for 18 seconds (1800 points in total) from 6 seconds to 24 seconds within the ply peeling time of 30 seconds is defined as the ply peel strength. The ply peeling strength of the toilet paper 1x is preferably 7.0 cN / 114 mm or more and 25.0 cN / 114 mm or less, and more preferably 10.0 cN / 114 mm or more and 20.0 cN / 114 mm or less.

[Softness TS7, Smoothness TS750, Rigidity D]
The intensity (TS7) of the maximum peak of the spectrum including 6500 Hz, which was automatically acquired by the software on the tissue softness measuring device TSA (manufactured by emtec; Tissue Softness Analyzer) of toilet paper 1x, is 11 dBV ² rms or more and 25 dBV ² rms. It is preferably 13 dBV ² rms or more and 23 dBV ² rms or less, and more preferably 15 dBV ² rms or more and 21 dBV ² rms or less. This TS7 is an index of the softness of the toilet paper 1x, and when the TS7 is within the above range, the softness of the toilet paper 1x and the toilet roll 1 for the shower toilet is maintained in a well-balanced manner.

Further, for the toilet paper 1x, the intensity (TS750) of the maximum peak of the first spectrum from the low frequency side automatically acquired by the software on the tissue softness measuring device TSA is 16 dBV ² rms or more and 40 dBV ² rms or less. It is preferably 20 dBV ² rms or more and 36 dBV ² rms or less, and more preferably 24 dBV ² rms or more and 32 dBV ² rms or less. This TS750 is an index of the smoothness of the toilet paper 1x, and when the TS750 is in the above range, the smoothness of the toilet paper 1x and the toilet roll 1 for the shower toilet is maintained in a well-balanced manner.

In addition, when the toilet paper 1x is pushed from above by the tissue softness measuring device TSA with the pushing pressure of 100 mN and 600 mN, respectively, with respect to the sample of the toilet paper 1x installed on the sample table without rotating the rotor with a blade. The measured value of the rigidity D, which is represented by the amount of deformation and displacement of the sample in the vertical direction between the indentation pressures of 100 mN and 600 mN, is preferably 2.2 mm / N or more and 3.4 mm / N or less. It is more preferably 4 mm / N or more and 3.2 mm / N or less, and further preferably 2.6 mm / N or more and 3.0 mm / N or less. When D is in the above range, the cushioning property of the toilet paper 1x is maintained in a well-balanced manner.

The measuring method of TS7, TS750 and D using the tissue softness measuring device TSA and the measuring device used for the measuring method are described in detail in, for example, Japanese Patent Application Laid-Open No. 2013-236904. For various measuring methods using the tissue softness measuring device TSA, refer to the above patent documents. For TS750, TS7, and D, a sample of toilet paper 1x at a position corresponding to 20% of the winding length of the shower toilet roll 1 from the edge 1e of the outermost toilet paper 1x of the toilet roll 1. Is used, and the measurement surface is the same as the surface adopted as the depth A of the embossing pattern described above.

[Water absorption]
The water absorption of toilet paper 1x (sheet laminated in 2 plies) based on the old JIS S 3104 is preferably 7.0 seconds or less, more preferably 5.0 seconds or less, and more preferably 3.0 seconds. The following is more preferable. The degree of water absorption is preferably short, and when it is within the above time range, good water absorption is maintained. When dropping water, drop it on the surface side of the toilet paper 1x.

[Easy to unravel]
The ease of unraveling based on JIS P 4501 when the toilet paper 1x is peeled off is preferably 8.0 seconds or more and 60.0 seconds or less, and 8.0 seconds or more and 45.0 seconds or less. Is more preferable, and it is further preferable that it is 8.0 seconds or more and 30.0 seconds or less. The ease of unraveling is preferably short, and within the above time range, good water solubility in the toilet is maintained, and water resistance when the toilet paper 1x in the shower toilet gets wet is also good. become.

<Toilet paper>
Toilet paper 1x may be made of 100% by mass of wood pulp, and may contain used paper pulp, non-wood pulp, deinked pulp, used liquid beverage paper pack, etc., but it shall be 50% or less from the viewpoint of quality. Is preferable. In order to obtain the target quality, the content of NBKP (coniferous bleached kraft pulp) is preferably 20% by mass or more and 60% by mass or less, more preferably 30% by mass or more and 50% by mass or less. It is more preferably 35% by mass or more and 45% by mass or less. Further, the content of LBKP (hardwood bleached kraft pulp) is preferably 40% by mass or more and 80% by mass or less, more preferably 50% by mass or more and 70% by mass or less, and 55% by mass or more and 65% by mass or less. Is more preferable.

As the above-mentioned LBKP, pulp formed from a material of the genus Eucalyptus of the family Myrtaceae, represented by the genus Eucalyptus Grandis and the genus Eucalyptus, is preferable.

In addition, in order to secure appropriate strength in the toilet paper 1x, the strength can be adjusted by blending the raw materials by ordinary means and performing the beating treatment of the pulp fibers. The beating to obtain the target quality is the Canadian standard freeness measured by JIS P 8121 with respect to the commercially available virgin pulp, and the difference in the freeness before and after beating is 0 ml or more and 150 ml or less, more preferably. A beating process for reducing the amount to 10 ml or more and 100 ml or less, more preferably 20 ml or more and 70 ml or less can be mentioned.

When a virgin raw material is used for the paper material, the toilet paper 1x can be made by blending softwood bleached kraft pulp and broadleaf bleached kraft pulp having a certain range of fiber length and fiber roughness in a specific range. .. As additives to paper materials, depending on the required quality of the final product, softeners including debonder softeners, bulking agents, dyes, dispersants, dry paper strength enhancers, drainage improvers, pitch control agents, water absorption An improver or the like can be used. It is preferable not to use a wet paper strength enhancer. When the used paper raw material is used for the toilet paper 1x, the same treatment as in the case of the virgin type is performed.

[Manufacturing method of toilet paper]
Toilet paper 1x can be produced, for example, in the order of (1) papermaking and creping, (2) embossing (see FIG. 8), and (3) roll winding. At the time of ply-up, after embossing each sheet on the front surface and the back surface side of the toilet paper 1x, as shown in FIG. 2, the convex portion of one sheet and the concave portion of the other sheet are in the thickness direction. Stack them so that they overlap to make 2 plies. Further, when laminating two plies, ply bond glue (glue) or knurling (edge embossing) can be used.

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.

The contents of NBKP and LBKP were blended so as to be the values shown in Tables 1 to 3, and (1) papermaking and creping, (2) embossing (see FIG. 8), and (3) roll winding. Through the steps, toilet papers and toilet rolls for shower toilets of Examples 1 to 29 and Comparative Examples 1 to 14 were manufactured.

The following evaluations were made.

Basis weight: Measured based on JIS P8124 and converted per sheet.

Paper thickness: Measured using a thickness gauge (dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). 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. Five sets of toilet paper, in which sheets were laminated in two plies, were stacked and measured as 10 sheets. 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 P 8113, the maximum load to break was measured in units of gf / 25 mm for toilet paper laminated in two plies. .. The tensile strength was measured under the condition of a tensile speed of 300 mm / min. DGMT was calculated from the values of DMDT and DCDT.

Roll winding diameter DR, core outer diameter DI: Measured using a diameter rule manufactured by Muratec KDS Co., Ltd. In the measurement, 10 rolls were measured and the measurement results were averaged.

DGMT, ply peeling strength, embossing pattern depth, air layer thickness between sheets, total area ratio of decoration embossing to total area of micro-embossing, area and total area ratio of each embossing, water absorption per 1g of toilet paper The softness TS7, the smoothness TS750, and the rigidity D were measured by the above-mentioned method.

Volume length: The length of 10 sheets was actually measured for the sheets between the perforations of the toilet roll. After that, the number of sheets of the roll was actually measured, and the winding length was obtained by proportional calculation from the length of 10 sheets and the number of sheets. For example, when the length of 10 sheets is 1.14 m and the number of sheets is 316, it is 1.14 m × (316/10) = 36 m.

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.
The above measurement was performed after holding the equilibrium state under the temperature and humidity conditions (23 ± 1 ° C., 50 ± 2% RH) specified in JIS P 8111.

The obtained results are shown in Tables 1 and 2.

Based on the above, the toilet roll for shower toilets of the present invention has less stiffness and roughness, less frequent roll replacement and less frequent sticking to the skin, and has a feeling of use, volume, beauty, plumpness, and moisture. It can be seen that the wiping feeling, the toughness of the paper, the softness, the smoothness and the cushioning property are good.

1 Toilet roll for shower / toilet 1a Front side 1b Back side 1e Outermost edge of toilet paper 1x Toilet paper 2a Decoration embossing 2b Micro embossing 3 Embossing roll 4 Rubber roll

Claims (8)

It is a toilet roll made by winding toilet paper laminated in two plies and having an embossed pattern in a roll shape.
The embossing pattern is a double embossing pattern provided on each of the two plies.
The basis weight per sheet of toilet paper is 13 g / m ² or more and 22 g / m ² or less, and the paper thickness is 1.20 mm / 10 sheets or more and 1.90 mm / 10 sheets or less.
DGMT, which is the square root of the product of the vertical tensile strength DMDT during drying and the horizontal tensile strength DCDT during drying based on JIS P8113 of toilet paper, is 200 gf / 25 mm or more and 400 gf / 25 mm or less. ,
A toilet roll for shower toilets having a ply peeling strength of toilet paper of 5.0 cN / 114 mm or more and 30.0 cN / 114 mm or less. Measure the depth of the embossed pattern on the front and back surfaces of the same part of the toilet paper, and set the depth of the embossed pattern on the surface with the large measured value to the depth A and the depth of the embossed pattern on the surface with the small measured value to the depth B. In the above case, the depth A is 130 μm or more and 400 μm or less, the depth B is 60 μm or more and 240 μm or less, and the thickness of the air layer between the two-ply sheets is satisfied, provided that the depth A> the depth B is satisfied. The toilet roll for a shower toilet according to claim 1, wherein the size is 40 μm or more and 190 μm or less. The toilet roll for a shower toilet according to claim 1 or 2, wherein the amount of water absorption per 1 g of toilet paper is 10 ml or more and 20 ml or less. The embossing pattern is composed of two types of embossing, decoration embossing and micro embossing having different areas, and the area of each decoration embossing is larger than the area of each micro embossing, and the micro in the unit area of toilet paper. The toilet roll for a shower toilet according to any one of claims 1 to 3, wherein the total area ratio of the decoration embossing to the total area of the embossing is 0.5 or more and 1.9 or less. The area per piece of decoration embossing is 0.7 mm ² or more and 2.3 mm ² or less, and the total area ratio of decoration embossing per unit area of toilet paper is 4% or more and 15% or less, and one piece of micro embossing. The hit area is 0.10 mm ² or more and 0.50 mm ² or less, and the total area ratio of micro-embossing per unit area of toilet paper is 3% or more and 12% or less, according to any one of claims 1 to 4. Toilet roll for shower toilet. The toilet roll for a shower toilet according to any one of claims 1 to 5, which contains 20% by mass or more and 60% by mass or less of softwood bleached kraft pulp and 40% by mass or more and 80% by mass or less of hardwood bleached kraft pulp. The toilet roll for a shower toilet according to any one of claims 1 to 6, wherein the winding length is 25 m or more and 100 m or less, and the winding diameter is 104 mm or more and 130 mm or less. Softness TS7 is 11 dBV 2 rms or more and 25 dBV ² rms or less, smoothness TS750 is 16 dBV ² rms or more and 40 dBV ² rms or less, and rigidity D is 2.2 mm / N or more and 3.4 mm / N or less by the toilet paper tissue softness measuring device TSA. The toilet roll for a shower / toilet according to any one of claims 1 to 4.

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