JP2018064664A - Toilet roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toilet roll that increases a sales promotion effect, is excellent in space saving properties in carrying and storing it by increasing the winding length per roll, and is also excellent in softness of the sheet and the roll without reducing its basis weight.SOLUTION: A toilet roll 1 formed by winding one-ply toilet paper in a roll state is provided with an embossed pattern in the toilet paper. The winding length of the toilet roll 1 is 105-210 m, the winding diameter is 107-140 mm, and the roll softness is 0.3-1.5 mm.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a toilet roll obtained by winding up one-ply toilet paper.

  Toilet rolls that are mainly packaged in units of 4 rolls, 12 rolls, etc. are commercially available. Since these packages are bulky, the amount that can be carried at the time of purchase is limited, and the amount that can be purchased at one time is naturally limited. In addition, since the storage space is limited during storage at home, work, public facilities, etc., the amount that can be stored is limited.

For this reason, toilet rolls have been developed in which the basis weight per sheet of toilet paper is reduced to 14 g / m ² or less and the winding length is increased (Patent Documents 1 and 2).

In addition, the present applicant has developed a toilet roll having a longer winding length while improving the feeling of use by increasing the basis weight per sheet of toilet paper to be higher than 13 g / m ² (Patent Documents 3 and 4). ).

JP 2006-087703 A JP 2013-208297 A JP 2014-188342 A JP 2014-233363 A

  However, when the basis weight of the paper is lowered, the strength is lowered and the feeling of use and bulkiness are lowered. On the other hand, if the calendering process is weakened to increase the bulk of the paper to compensate for these problems, there are problems that the smoothness is inferior or the roll diameter becomes large and it is difficult to fit in the toilet paper holder.

  In addition, the inventions described in Patent Document 3 and Patent Document 4 improve the texture while increasing the basis weight of the toilet paper and ensure the softness of the sheet, but consider the softness of the roll. It has not been. Here, the softness of the roll is the tactile sensation when the toilet roll is held in the store, and does not directly reflect the softness of the sheet. This is because the softness of the sheet is important when the toilet roll is used, but the softness of the sheet cannot be confirmed by unwinding the roll at the store. Therefore, if the roll is hard, even if the sheet itself is soft, the sheet is considered to be hard, and there is a problem that the purchase cannot be promoted.

  Therefore, the present invention increases the roll length per roll and makes the sheet and roll soft without lowering the basis weight, so that it is excellent in the amount that can be carried and the space saving at the time of storage. The purpose is to provide toilet rolls with enhanced sales promotion effect due to softness.

In view of the above problems, the present inventors conducted extensive research. As a result, in the toilet roll in which 1 ply of toilet paper is rolled up, an emboss pattern is provided on the toilet paper, and the winding length, winding diameter and roll softness of the toilet roll are adjusted to predetermined values. The present inventors have found that the above problems can be solved and have completed the present invention. Specifically, the present invention provides the following.
(1) A first aspect of the present invention is a toilet roll obtained by winding up a roll of 1-ply toilet paper, the embossed pattern is provided on the toilet paper, and the roll length of the toilet roll is 105 m or more and 210 m or less. A toilet roll having a winding diameter of 107 mm or more and 140 mm or less and a roll softness of 0.3 mm or more and 1.5 mm or less.
(2) In the toilet roll according to (1), the depth of the emboss pattern may be not less than 0.01 mm and not more than 0.35 mm.
(3) In the toilet roll as described in said (1) or (2), the said toilet paper may contain kraft pulp 40 mass% or more and 100 mass% or less.
(4) In the toilet roll according to any one of (1) to (3), the toilet paper may contain 0% by mass to 60% by mass of waste paper pulp derived from milk carton.
(5) In the toilet roll according to any one of (1) to (4), conforming to ISO 2470 when the surface of the toilet paper is irradiated with a C light source defined by CIE (International Lighting Commission) Difference between whiteness UV-in and whiteness UV-cut based on ISO 2470 when the surface of the toilet paper is irradiated with the C light source through a filter that cuts ultraviolet light having a wavelength of 420 nm or less 0.0 point or more and 2.5 point or less may be sufficient.

  According to the present invention, the roll length per roll is improved by adjusting the roll length and roll diameter of the toilet roll to predetermined values. Moreover, the embossing pattern is provided in the toilet paper, and the softness of the toilet paper and the toilet roll is made good without lowering the basis weight of the toilet paper by adjusting the roll softness of the toilet roll to a predetermined value. Therefore, it is possible to obtain a toilet roll that is excellent in the amount that can be carried and the space saving at the time of storage, and that has improved the sales promotion effect due to good softness.

It is a perspective view which shows the external appearance of the toilet roll which concerns on 1st embodiment of this invention. It is a figure which shows the picked-up image of the emboss pattern on the roll surface side. It is sectional drawing which shows the embossing pattern provided in the roll surface and the back surface. It is a figure which shows the measuring method of the depth of an embossing pattern. It is a figure which shows the measuring method of the depth of an embossing pattern. It is a figure which shows the measuring method of the depth of an embossing pattern. It is a figure which shows the measuring method of the depth of an embossing pattern. It is a figure which shows an example of a machine winder. It is a figure which shows an example of a roll winding processing machine.

  Embodiments of the present invention will be described in detail below, but these are given for illustrative purposes and do not limit the present invention.

[Toilet roll]
As shown in FIG. 1, a toilet roll 1 according to Embodiment 1 of the present invention is a roll of 1-ply toilet paper.

<Winding length>
The roll length of one roll of the toilet roll 1 of the present invention, that is, the total length when the toilet roll 1 is unfolded is 105 m or more and 210 m or less, preferably 130 m or more and 190 m or less, and 150 m or more and 170 m or less. More preferred. The roll wound to a length within the above numerical range is cut to a predetermined width to produce one roll of toilet roll 1.

<Winding diameter>
As shown in FIG. 1, the winding diameter DR in the toilet roll 1 of the present invention is 107 mm or greater and 140 mm or less, preferably 110 mm or greater and 135 mm or less, and more preferably 117 mm or greater and 125 mm or less.

  In the toilet roll 1 of the present invention, by making the winding length and winding diameter within the above-mentioned numerical ranges, the amount that can be carried and the space saving at the time of storage are good, and the mounting property to the toilet paper holder is also good. A good toilet roll 1 can be obtained.

<Winding density>
The winding density in the toilet roll 1 is represented by (winding length × number of plies) ÷ (cross-sectional area of the roll). The cross-sectional area of the roll is represented by {the cross-sectional area of the outer diameter (rolling diameter DR) portion of the roll}-(the cross-sectional area of the core outer diameter portion). For example, when the winding length is 150 m, 1 ply, the winding diameter is 117 mm, and the outer diameter of the core is 39 mm, the winding density = (150 m × 1) ÷ {3.14 × (117 mm ÷ 2 ÷ 10) ² −3.14 × (39 mm ÷ 2 ÷ 10) ² } = 1.57 m / cm ² .

  Here, the core refers to the core of the toilet roll, and the core outer diameter refers to the diameter of the center hole of the roll.

The winding density in the toilet roll 1 of the present invention is preferably 1.1 m / cm ² or more and 1.9 m / cm ² or less, more preferably 1.2 m / cm ² or more and 1.8 m / cm ² or less. Preferably, it is more preferably 1.3 m / cm ² or more and 1.6 m / cm ² or less.

<Roll density>
The roll density of the toilet roll 1 of the present invention is represented by (roll mass not including the core) / (roll volume). The roll mass is the mass of the toilet roll with the roll width W converted to around 114 mm. The roll volume is represented by [{cross-sectional area of the outer diameter (rolling diameter) portion of the roll) − (cross-sectional area of the core outer diameter portion)] × roll width (converted per 114 mm). For example, when the roll mass per roll width of 114 mm is 327 g, the winding diameter is 122 mm, and the core outer diameter is 39 mm, the roll density = 327 g ÷ [{3.14 × (122 mm ÷ 2 ÷ 10) ² −3.14 × ( 39 mm ÷ 2 ÷ 10) ² } × (114 mm ÷ 10)] = 0.27 g / cm ³ . When the toilet roll has no core, the diameter of the center hole is the core outer diameter.

Roll Density of toilet rolls 1 of the present invention is more it is preferred that 0.21 g / cm ³ or more 0.37 g / cm ³ or less, is 0.22 g / cm ³ or more 0.34 g / cm ³ or less Preferably, it is more preferably 0.26 g / cm ³ or more and 0.30 g / cm ³ or less.

<Roll mass>
The roll mass of the toilet roll 1 of the present invention is a roll mass that does not include a core (core) whose roll width W is 114 mm. When the roll width W is different from 114 mm, the roll mass is obtained by converting W into 114 mm. For example, when the roll width W is 105 mm, the mass obtained by multiplying the roll mass by a coefficient (114/105) is the roll mass per W of 114 mm.

  The roll mass of the toilet roll 1 of the present invention is preferably 235 g or more and 480 g or less, more preferably 250 g or more and 420 g or less, and further preferably 300 g or more and 350 g or less. In the toilet roll 1 of the present invention, by setting the roll mass within the above numerical range, the toilet roll 1 having a good winding length, winding diameter and mass per roll can be obtained.

<Core outer diameter>
The outer diameter of the core of the 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 still more preferably 37 mm or more and 43 mm or less. In the toilet roll 1 of the present invention, by setting the core outer diameter within the above numerical range, the toilet roll 1 can be easily attached to the toilet paper holder and can be handled at the time of manufacture. it can. The mass of the toilet roll 1 core is preferably 3.2 g or more and 6.0 g or less, more preferably 4.0 g or more and 5.5 g or less, and 4.5 g or more and 5.0 g or less. Is more preferable. By making the core mass within the above numerical range, the strength of the core and the cost of the core suitable for the long toilet paper as in the present application can be improved. The mass of the core is a mass having a roll width of 114 mm, like the roll mass.

<Roll softness>
In the toilet roll 1 of the present invention, because the toilet roll 1 has a long winding length as described above, when the softness of the toilet roll 1 is evaluated, the roll can be held by evaluating the roll softness described below. It is preferable to evaluate the softness when held.

  The roll softness of the toilet roll 1 is measured as follows using a compression tester (a handy compression tester KES-G5 manufactured by Kato Tech Co., Ltd.). In addition, let the direction parallel to the axial center of the toilet roll 1 be a height direction, and let the direction perpendicular | vertical to the tangent of the circumference of the toilet roll 1 be a radial direction.

  First, an acrylic pipe is inserted into the core of the toilet roll 1. The wall thickness of the acrylic pipe is 2 mm. The length of the acrylic pipe is 10 mm longer than the roll width of the toilet roll 1 (when the roll width of the toilet roll 1 is 114 mm, the length of the acrylic pipe is 124 mm). The outer diameter of the acrylic pipe is slightly smaller than the inner diameter of the core of the toilet roll 1, and when the acrylic roll is placed so that the axis of the toilet roll 1 becomes vertical after the acrylic pipe is inserted, the toilet roll 1 moves by its own weight. No size. When it is difficult to insert the acrylic pipe into the core and the outer diameter of the acrylic pipe is slightly reduced, the wall thickness may be slightly reduced with water-resistant paper or the like. The mass of the acrylic pipe is about 31 g when the length is 125 mm and the outer diameter is 38 mm. When the acrylic pipe is inserted into the core of the toilet roll 1 and the roll density is high in the toilet roll 1 having a long winding length, the roll softness of the toilet roll 1 can be increased regardless of the hardness of the core. Can be evaluated.

Next, the toilet roll 1 is placed on a hard table so that its axis is horizontal. Then, the KES-G5 compressor (area: 2.0 cm ² ) is pushed into the center of the toilet roll 1 in the radial direction from above in the radial direction under the condition of a speed of 10 mm / min. Asshukuko is the indentation depth when the pressure pushing the rolls of 5gf / cm ² T0, the indentation depth when the pressure of 150 gf / cm ² as Tm, and roll softness to (Tm-T0). The measurement is performed 5 times, and the measurement results are averaged. In addition, the height direction at the time of pushing the said compressor into the toilet roll 1 does not need to be a center part of a height direction except the both ends of a height direction. In the measurement of the roll softness of the toilet roll 1 of the present invention, the measurement is performed by pressing the above-mentioned compressor near the middle between the center portion and the end portion of the toilet roll 1 in the height direction.

  The roll softness of the toilet roll 1 of the present invention is 0.3 mm to 1.5 mm, preferably 0.4 mm to 1.2 mm, more preferably 0.5 mm to 0.9 mm. preferable.

[Toilet Paper]
The toilet paper in the toilet roll 1 of the present invention may be composed of 100% by mass of wood pulp, and may include waste paper pulp, non-wood pulp, and deinked pulp. However, in order to obtain the target quality, the content of NBKP (conifer bleached kraft pulp) is preferably 0% by mass or more and 30% by mass or less, and preferably 0% by mass or more and 20% by mass or less. More preferably, it is 0 to 10% by mass. The content of LBKP (hardwood bleached kraft pulp) is preferably 30% by mass to 90% by mass, more preferably 40% by mass to 80% by mass, and more preferably 50% by mass to 70% by mass. More preferably, it is as follows.

  The content of the waste paper pulp derived from the milk carton (milk pack) is preferably 0% by mass to 60% by mass, more preferably 10% by mass to 50% by mass, and more preferably 20% by mass to 45%. More preferably, it is at most mass%. Moreover, as a content rate of a kraft pulp, it is preferable that it is 40 to 100 mass%, It is more preferable that it is 50 to 90 mass%, It is 55 to 80 mass% Is more preferable.

  Waste paper pulp derived from milk cartons (milk cartons) is mainly composed of softwood pulp, and has the advantage of ensuring the strength of toilet paper. On the other hand, if the content ratio is too high, the quality of the product will be affected. The content is preferably within the above numerical range.

  Pulp produced from Eucalyptus eucalyptus represented by Eucalyptus genus Grandis and Eucalyptus globulus is preferred as the grade of LBKP.

  Further, 25 parts by mass or less of deinked pulp derived from used newspaper or magazine waste paper can be blended with 100 parts by mass of waste paper pulp derived from NBKP, LBKP, or milk carton. In addition, when 25 mass parts of deinked pulp is blended, the content of deinked pulp in the toilet paper (sheet) is 25 mass parts / (100 mass parts + 25 mass parts) × 100 = 20 mass%. The content of the deinked pulp is preferably 0% by mass to 20% by mass, more preferably 0% by mass to 10% by mass, and further preferably 0% by mass to 5% by mass. The content is preferably 0% by mass. Since deinked pulp is also used paper, the quality will vary greatly. Moreover, deinked pulp usually contains a fluorescent dye, and if its content exceeds 20% by mass, it will contain a lot of fluorescent dye, which is not preferable.

  In addition, in order to ensure an appropriate strength for the toilet paper, raw materials can be blended by ordinary means, and the strength can be adjusted by beating the pulp fibers. As the beating to obtain the target quality, it is preferable to reduce the Canadian standard freeness measured by JIS-P8121 with respect to a commercially available virgin pulp, and the difference in Canadian standard freeness before and after the beating is 0 mL. It is preferably 150 mL or less, more preferably 10 mL or more and 100 mL or less, and further preferably 20 mL or more and 70 mL or less.

  Toilet paper can be made by blending softwood kraft pulp and hardwood kraft pulp having a certain range of fiber length and fiber roughness in a specific range when virgin raw materials are used for the stock. Additives to paper stocks include softeners including debonder softeners, bulking agents, dyes, dispersants, dry paper strength enhancers, drainage improvers, pitch control agents, absorbency, depending on the required quality of the final product. An improver or the like can be used. Moreover, it is preferable not to use a wet paper strength enhancer.

  In addition, also when using a waste paper raw material as toilet paper, the process similar to the case of a virgin type is performed.

<Embossed pattern>
It is preferable to provide an emboss pattern on the toilet paper in the toilet roll 1 of the present invention, and a single emboss pattern 2 is preferable. In addition, an emboss pattern says the uneven | corrugated shape formed by embossing.

  FIG. 2 shows a captured image of the recess 2R of the embossing pattern of the single embossing pattern 2 on the surface side of the toilet paper in the toilet roll 1. In addition, in the toilet roll 1 which concerns on this invention, the surface side of toilet paper means the surface which comprises the outer side of toilet roll 1, and the back surface side of toilet paper is the inner side which is the paper tube side of toilet roll 1 Means the surface that constitutes

(Embossed pattern depth)
FIG. 3 is a cross-sectional view showing a single embossed pattern 2 provided on a one-ply toilet paper in the toilet roll 1. 3 corresponds to the roll surface side, FIG. 3A shows a case where the depth D of the emboss pattern is deep, and FIG. 3B shows a case where the depth D of the emboss pattern is shallow. In addition, the paper thickness t2 of the toilet paper after the embossing process (this paper thickness reflects the distance between the non-embossed pattern portion on the front surface side of the toilet paper and the convex portion 2P of the embossed pattern on the back surface side). It is. However, even when the paper thickness t2 of the toilet paper is the same, the sheet in FIG. 3A in which the embossed pattern is so deep that the depth D of the embossed pattern is deeper is softer and has a better texture. This is considered to be because the embossed pattern of FIG. 3 (a) has a higher bulk with respect to the thickness of the base paper (lower density), and is more easily deformed, improving the softness of the sheet. It is done. Moreover, if it is made smooth without providing an emboss pattern on the surface side of the toilet paper, the surface is too smooth and the surface feels crisp, and the softness of the sheet is inferior.

  Therefore, the depth D of the embossing pattern of the single embossing pattern 2 of the toilet paper in the toilet roll 1 of the present invention is preferably 0.01 mm or more and 0.35 mm or less, and 0.04 mm or more and 0.30 mm or less. Is more preferable, and it is still more preferable that it is 0.09 mm or more and 0.24 mm or less.

  By setting the depth D of the embossing pattern of the toilet paper in the toilet roll 1 of the present invention within the above numerical range, the toilet roll 1 having excellent bulkiness and roll softness can be obtained.

  In addition, in the toilet paper, when the concave portion 2R of the embossed pattern is provided on the surface side where water is likely to adhere when using a warm water washing toilet seat or the like, the concave portion 2R has a better tactile feel than the convex portion 2P, so the softness of the sheet is improved. To do.

  The depth D of the embossing pattern of the toilet paper in the toilet roll 1 of the present invention is obtained by measuring the height difference of the embossing pattern using a microscope.

  As the microscope, the product name “One-shot 3D measurement macroscope VR-3100” manufactured by KEYENCE can be used. As the microscope image observation / measurement / image analysis software, the product name “VR-H1A” can be used. Measurement is performed under the conditions of a magnification of 12 times and a visual field area of 24 mm × 18 mm. In addition, you may change a measurement magnification and a visual field area suitably according to the magnitude | size of the embossing pattern calculated | required.

  First, as shown in FIG. 4, the longest portion a of the peripheral fr of the emboss pattern is obtained. Fig.5 (a) shows the height profile on XY plane by a microscope, and it turns out that the height of the toilet paper surface is represented by the shading. 5A shows individual emboss patterns, and the longest part a of one emboss pattern can be distinguished from FIG. 5A. When a line segment A-B crossing the longest portion a is drawn, a height (measured cross-section curve) profile of the emboss pattern is obtained as shown in FIG. Here, since the convex portion (non-embossed pattern portion) and the concave portion of the embossed pattern can be recognized by the color density of the XY plane image, the line segment AB extends across the portion where the convex portion and the concave portion are adjacent to each other. You can decide.

  Here, the height profile in FIG. 5 (b) is a (measurement) cross-sectional curve T representing the unevenness of the actual toilet paper sample surface, but there is noise (fiber lump on the toilet paper surface or fibers In addition, it includes a steep peak due to a beard-like shape or a portion having no fiber), and it is necessary to remove such a noise peak 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 two inflection points P1 and P2 that are convex upward are obtained from the contour curve U. By obtaining the minimum value sandwiched between the inflection points P1 and P2, the minimum value Min of the depth is obtained. Further, the average value of the depth values of the inflection points P1 and P2 is set as the maximum value Max.

  In this way, the depth D of the emboss pattern is set to the maximum value Max−the minimum value Min. Further, the distance (length) on the XY plane of the inflection points P1 and P2 is defined as the length of the longest portion a. The “contour curve” is λc: 800 μm from the cross-sectional curve (where λc is a “filter that defines the boundary between the roughness component and the swell component” described in JIS-B0601 “3.1.1.2”). It is a curve obtained by removing the surface roughness component of a shorter wavelength with a low-pass filter. Note that if λc is set to be equal to or larger than the interval P1 between adjacent emboss patterns (this is referred to as an emboss pitch), the peak may be recognized as noise, so λc is set to be less than the emboss pitch. For example, when the emboss pitch is 800 μm or less, for example, λc is set to 250 μm. The P1 interval between adjacent emboss patterns is similarly determined for P1 and P2 for the next emboss pattern connected to the left or right in FIG. 6, and two P1s when adjacent emboss patterns are aligned with P1, P2, and P1. Is the interval.

  Similarly, the depth D of the emboss pattern is measured for the longest portion b in the direction perpendicular to the longest portion a in FIG. 5A, and the depth D of each emboss pattern of the longest portions a and b is The larger value is adopted as the depth D of the emboss pattern. The above measurement is performed on any ten emboss patterns on the surface side of the toilet paper, and the average value is adopted as the depth D of the final emboss pattern. However, as shown in FIG. 7, when the embossed pattern is connected in the flow direction (MD direction), the longest part a becomes the same as the winding length, the height difference cannot be obtained, and the depth D of the concave portion is set. It cannot be measured. Therefore, the depth D of the concave portion can be measured by drawing a line segment AB so as to straddle the embossed pattern in the width W direction orthogonal to the direction in which the embossed pattern is connected (MD direction). Similarly, when the emboss pattern is connected in the width W direction (CD direction), a line segment AB is drawn in the flow direction (MD direction) so as to straddle the emboss pattern, and the depth D of the recess is measured.

  When any ten emboss patterns are selected in the measurement of the depth D of the emboss pattern, the toilet roll 1 is wound from the end of the outer roll of the toilet roll 1 (the position where the toilet paper starts to be used). Measure at the part corresponding to 20% of the length. For example, when the winding length is 150 m, the measurement is performed at 150 m × 20% = 30 m from the end. In addition, when the 20% portion of the winding length hits the perforation, the outer winding side of the perforation is measured.

  When measuring the depth D of the emboss pattern, the measurement surface is the surface side of the toilet paper.

(Embossed pattern area)
The area of each embossing pattern of the toilet paper in the toilet roll 1 of the present invention is obtained as the area S of the embossing pattern by the product of the longest part a and the longest part b (a × b). For the longest part a and the longest part b, values obtained by averaging the values of individual a and b for the ten emboss patterns on the surface side of the toilet paper described above are used. About the measuring method about the area of an embossing pattern, the measuring method of depth D of said embossing pattern can be used.

The area S of each embossing pattern of the single embossing pattern 2 of the toilet paper in the toilet roll 1 of the present invention is preferably 0.2 mm ² or more and 9.0 mm ² or less, and 1.0 mm ² or more and 7.0 mm ² or less. It is more preferable that it is 1.8 mm ² or more and 5.0 mm ² or less. Further, the area ratio of the embossed pattern (ratio of the portion having the embossed pattern in the toilet paper) is preferably 3% to 60%, more preferably 7% to 45%, and more preferably 10%. More preferably, it is 30% or less. When it is difficult to obtain the area ratio of the embossing pattern of the toilet paper, the area ratio of the convex portion of the embossing roll 111 can be set as the area ratio of the embossing pattern. By setting the area and area ratio of the embossed pattern within the above numerical range, the cosmetics and roll softness can be improved.

  The shape of the emboss pattern is not particularly limited, such as a rectangle, a square, a round shape, a long round shape, or the like. In addition, the winding diameter and the winding density can be adjusted by appropriately adjusting the size of the embossed pattern and the area ratio (number) of the embossed pattern described above.

<Whiteness>
When the deinked pulp contains a fluorescent dye, the difference Δ between the whiteness value of the toilet paper (sheet) under the UV-in condition and the whiteness value under the UV-cut condition becomes large. Here, UV-in is the whiteness based on ISO 2470 when a C light source (including ultraviolet light) defined by the CIE (International Commission on Illumination) is irradiated on the sheet surface side. UV-cut is whiteness based on ISO 2470 when a C light source is irradiated on the sheet surface side through a filter that cuts out ultraviolet light having a wavelength of 420 nm or less. Difference Δ = (whiteness UV-in) − (whiteness UV-cut). The whiteness can be measured using a high-speed spectrophotometer CMS-35SPX manufactured by Murakami Color Research Laboratory Co., Ltd. according to ISO 2470.

  The difference Δ between the whiteness UV-in and the whiteness UV-cut on the surface side of the toilet paper in the toilet roll 1 of the present invention is preferably 0.0 points or more and 2.5 points or less, and 0.0 points It is more preferably 1.5 points or less, more preferably 0.0 points or more and 1.0 points or less, and particularly preferably 0.0 points or more and 0.5 points or less.

<Basis weight>
The basis weight of the toilet paper in toilet rolls 1 of the present invention, per ply, is preferably 15.0 g / ^{m 2} or more 22.0 g / ^{m 2} or less, 17.0 g / ^{m 2} or more 21.0 g / m It is more preferably ² or less, and further preferably 18.0 g / m ² or more and 20.0 g / m ² or less.

<Paper thickness>
The thickness of the toilet paper in the toilet roll 1 of the present invention is preferably 0.40 mm / 10 or more and 1.10 mm / 10 or less, and is 0.55 mm / 10 or more and 1.00 mm / 10 or less. More preferably, it is 0.70 mm / 10 or more and 0.90 mm / 10 or less.

  By making the basis weight and paper thickness per toilet paper 1 ply in the toilet roll 1 of the present invention within the above numerical range, the winding density and roll density can be easily adjusted, and the strength is good. Thus, the toilet roll 1 having good usability and bulkiness can be obtained.

<Specific volume>
The specific volume of the toilet paper in the toilet roll 1 of the present invention was expressed as a volume cm ³ per unit g by dividing the paper thickness per sheet by the basis weight per sheet.

The specific volume of the toilet paper in the toilet roll 1 of the present invention is preferably 2.8 cm ³ / g or more and 6.5 cm ³ / g or less, and is 3.1 cm ³ / g or more and 5.5 cm ³ / g or less. it is more preferable, and further preferably 3.7 cm ³ / g or more 4.8 cm ³ / g or less.

  By making the specific volume of the toilet paper in the toilet roll 1 of the present invention within the above numerical range, the softness and water absorption of the sheet are good and the bulk of the embossing treatment is good. Can do.

<Strength>
The strength of the one-ply toilet paper in the toilet roll 1 of the present invention is the DMDT (Dry Machine Direction Tensile strength) in the longitudinal direction during drying based on JIS P 8113, and the tensile strength in the transverse direction during drying. It is assumed to be DCDT (Dry Cross Direction Tensile strength). In the toilet roll 1 according to the present invention, the flow direction of the product papermaking is the vertical direction, and the direction perpendicular to the flow direction is the horizontal direction.

  The DMDT of one-ply toilet paper in the toilet roll 1 of the present invention is preferably 2.5 N / 25 mm or more and 7.0 N / 25 mm or less, and preferably 3.0 N / 25 mm or more and 5.8 N / 25 mm or less. More preferably, it is more preferably 3.5 N / 25 mm or more and 4.5 N / 25 mm or less. In addition, the DCDT of 1-ply toilet paper in the toilet roll 1 of the present invention is preferably 0.7 N / 25 mm or more and 2.2 N / 25 mm or less, and 0.8 N / 25 mm or more and 1.8 N / 25 mm or less. More preferably, it is 1.0 N / 25 mm or more and 1.5 N / 25 mm or less. In addition, the measurement of tensile strength is performed on conditions with a tensile speed of 300 mm / min. The tensile strength can be adjusted by a known method.

  By setting DMDT and DCDT of the toilet paper in the toilet roll 1 of the present invention within the above numerical range, the toilet roll 1 having good strength and softness can be obtained.

<Water absorption>
The water absorption of the toilet paper in the toilet roll 1 of the present invention is measured based on the old JIS S 3104. However, the dripping amount is not 0.1 mL but 0.01 mL.

  The water absorption of 1-ply toilet paper in the toilet roll 1 of the present invention is preferably 7.0 seconds or less, more preferably 5.0 seconds or less, and further preferably 3.0 seconds or less. preferable. By setting it as the thing within said numerical range, it can be set as the toilet roll 1 with favorable water absorption and water absorption. In addition, when dripping water, it is dripped at the surface side of toilet paper.

<Ease of loosening>
The ease of loosening of 1-ply toilet paper in the toilet roll 1 of the present invention is measured based on JIS P 4501.

  The ease of unraveling 1 ply of toilet paper in the toilet roll 1 of the present invention is preferably 8 seconds to 60 seconds, more preferably 15 seconds to 50 seconds, and more preferably 20 seconds to 40 seconds. More preferably it is. By setting it as the thing within said numerical range, it can be set as the toilet roll 1 with the favorable water resistance when the toilet paper in the use of the toilet paper in the use of the water-washing toilet seat and warm water easiness to wet.

[Manufacturing method of toilet roll]
The detail of the manufacturing method of the toilet roll 1 and toilet paper of this invention is demonstrated.

  The toilet roll 1 and the toilet paper can be manufactured in the following order, for example, in the following order: (i) papermaking and creping, (ii) calendar processing by a machine winder, (iii) embossing processing and roll winding processing.

(I) Papermaking and creping First, a web is made from the above-mentioned stock on a wire part of a known papermaking machine and moved to the felt of the press part. Examples of the wire part type include a round net type, a long net type (Ford Linear) type, a suction breast type, a short net type, a twin wire type, and a crescent former type.

  The web is then dehydrated by a dehydration method such as dehydration by mechanically compressing the web with a suction pressure roll or a pressure roll or press roll without suction, or by aeration drying with hot air. The suction pressure roll or the pressure roll without suction is also used as a means for moving the web from the press part to the Yankee dryer.

  The web moved to the Yankee dryer is dried by a Yankee dryer and a Yankee dryer hood, then creped by a creping doctor, and taken up by a reel part.

  Creping (attaching a wavy wrinkle called crepe) is to mechanically compress the paper in the longitudinal direction (the sheet running direction on the paper machine). When the toilet paper web is manufactured, the web on the Yankee dryer is peeled off by the creping doctor and wound on the reel part. The speed difference between the Yankee dryer and the reel part (reel part speed ≤ Yankee dryer speed) ), A crepe is formed by a creping doctor.

The quality required for the toilet paper, that is, bulk (bulk feeling), softness, water absorption, surface smoothness, aesthetics (crepe shape), and the like depend on the speed difference. Depending on the conditions such as the speed difference, the basis weight of the web on the reel after creping preferably be a schematic 16.0 g / m ² or more 24.0 g / m ² or less, on the creping before Yankee dryer It is heavier than the web basis weight. The basis weight is more preferably 18.0 g / ^{m 2} or more 23.0 g / ^{m 2} or less, further preferably 19.0 g / ^{m 2} or more 22.0 g / ^{m 2} or less. If the above range is exceeded, the strength may increase and the paper may become stiff or the roll softness or roll density may become too large. If the range is less than the above range, the strength may be low and the paper may be easily torn, or the feeling of use and bulkiness may be increased. May be inferior.

Here, the crepe rate based on the speed difference between the Yankee dryer and the reel is defined by the following equation.
Crepe rate (%) = 100 × (Yankee dryer speed (m / min) −reel speed (m / min)) ÷ reel speed (m / min)

  The quality and operability are largely determined by the creping conditions, and the operating conditions that optimize the creping conditions are important for those skilled in the art. In the present invention, the crepe rate when producing toilet paper is preferably 10% or more and 50% or less, more preferably 15% or more and 40% or less, and further preferably 20% or more and 35% or less. preferable.

(Ii) Calendar Processing by Machine Winder FIG. 8 shows an example of the machine winder 100.

  As described above, the reel 11 taken up by the reel part after creping is set in the machine winder 100, subjected to a calendar process, and becomes an original roll 12. At this time, the calendar processing may be performed in two stages in the order of the first stack calendar machine 101 and the second stack calendar machine 102, and either the first stack calendar machine 101 or the second stack calendar machine 102 may be processed. Only one stage may be calendared. It is also possible to perform calendar processing with an on-machine calendar.

The thickness of the toilet paper before embossing (after calendaring) is preferably 0.50 mm / 10 or more and 1.50 mm / 10 or less, and 0.60 mm / 10 or more and 1.30 mm / 10 or less. It is more preferable that it is 0.70 mm / 10 or more and 1.10 mm / 10 or less. Further, the specific volume of the toilet paper in bulk roll 12 of embossed before (after calendering) is, 3.2 cm ³ / preferably g or higher 6.3cm at ³ / g or less, 3.5 cm ³ / g or more more preferably 5.8cm at ³ / g or less, and further preferably 3.8 cm ³ / g or more 5.3 cm ³ / g or less.

  In addition, the paper thickness of the toilet paper before embossing is the paper thickness in the raw fabric roll 12 after calendar processing in FIG. 8, and corresponds to the paper thickness t1 in FIG. However, as will be described later, since the paper thickness is a value measured at a measurement load of 3.7 kPa, it does not accurately reflect the paper thickness t1 in FIG.

  The first stack calender machine 101 and the second stack calender machine 102 are preferably each composed of two metal rolls, but one of the two rolls is an elastic roll so that soft calender processing can be performed. It may be.

  The linear pressure of the calendar is preferably 2.5 kgf / cm or more and 7.5 kgf / cm or less, and more preferably 3.0 kgf / cm or more and 7.0 kgf / cm or less. By making the wire thickness within the above numerical range, the softness and the roll diameter DR of the roll can be improved. The linear pressure is preferably higher than the first stack.

  During calendar processing, the draw can be adjusted appropriately. The draw between the reel 11 and the raw roll 12 after the calendar process is preferably 100% or more and 110% or less, and more preferably 102% or more and 108% or less.

The basis weight of the web of the raw fabric roll 12 after the calendar process and before the embossing process is preferably 15.5 g / m ² or more and 23.5 g / m ² or less per ply, and is 17.5 g / m ² or more. more preferably to 22.5 g / ^{m 2} or less, more preferably be 18.5 g / ^{m 2} or more 21.5 g / ^{m 2} or less. In the roll winding process described later, since the web is slightly stretched and the basis weight is also lowered, the basis weight is preferably slightly higher than the target basis weight of the toilet roll 1 in the final form.

  In order to increase the depth D of the emboss pattern, it is necessary to reduce the paper thickness t1 per sheet and make the unevenness conspicuous. Can be improved. In addition, since the web is slightly stretched in the roll winding process, the paper thickness is reduced similarly to the basis weight before and after winding, but the embossing can be adjusted to the target paper thickness of the toilet roll 1 in the final form. Also, depending on the embossing pattern, the paper thickness may become lower after embossing. In that case, adjust the base paper and calendar appropriately so that the target paper thickness and roll softness of the toilet roll are adjusted appropriately. To do.

(Iii) Embossing and roll winding process FIG. 9 shows an example of a roll winding machine 110.

  The calendered raw roll 12 is set on a roll winding machine 110 and subjected to a single embossing process by an embossing unit (embossing roll 111), and then a wide base paper roll 13 having the above winding diameter is wound by a winding mechanism 113. Rolled up. Thereafter, the base paper roll 13 is cut into a predetermined width (114 mm or the like) to form the toilet roll 1. In addition, it is preferable that the feeding direction of the raw fabric roll 12 used in the roll winder 110 is such that the surface side of the toilet paper is a Yankee surface.

  The roll winding machine 110 can be roughly classified into two types: a surface method and a center method. The surface method is a method in which the roll to be wound is wound while being supported by a plurality of other drive rolls from the outside, and the wound toilet roll 1 is easy to control the winding diameter, and the production speed becomes higher. The center method is a method of winding by driving a shaft passing through the center of the winding roll. The wound toilet roll 1 is a relatively soft product and is suitable for a product with delicate embossing. 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 softness of the toilet roll 1 can be adjusted relatively easily by the strength with which the toilet roll 1 is wound.

  Note that the machine winder 100 may be incorporated in the roll winder 110 and the roll winder 110 may perform calendar processing and embossing in this order.

  The single embossed pattern 2 is formed by pressing a convex portion of the embossed pattern of the embossed roll 111 against the surface on the surface side of the original fabric roll 12. Thereby, the embossing pattern (single embossing pattern 2) which the recessed part 2R appears on the surface (surface used as the surface side) which pressed the embossing roll 111 of the toilet paper in the toilet roll 1 and the convex part 2P on the back surface is formed. The material of the embossing roll is preferably a metal.

  The depth D of the emboss pattern can be controlled by appropriately adjusting the nip width of the rubber roll 112 facing the emboss roll 111. For example, the embossing pattern depth D can be adjusted by narrowing the nip width if the embossing roll 111 is deep, and increasing the nip width if the embossing roll 111 is shallow. Further, the strength of winding the roll can be adjusted so as to ensure the depth D of the emboss pattern. For example, when the depth of the emboss pattern is increased, the emboss pattern is liable to be crushed when the roll is wound. Therefore, the depth D of the emboss pattern can be adjusted by reducing the strength of winding the roll. Specifically, in the roll winding machine 110, when winding the wide base paper roll 13 by the winding mechanism 113, the pressing force of the rider roll 114 for sequentially winding the sheet by pressing the base paper roll 13 from the outer peripheral side. Can be adjusted by setting to a predetermined range.

  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 making the nip width within the above-mentioned numerical range, the front and back difference in tactile sensation between the concave portion 2R of the embossing pattern on the front side and the convex portion 2P of the embossing pattern on the back side is good, and roll softness and softness of the sheet It can also be good.

  The nip width can be measured using carbon paper. As a measuring method, first, the nip of the embossing roll 111 is escaped, and carbon paper and general copy paper are stacked and set. Next, the embossing roll 111 is nipped. Then, let the nip escape and remove the carbon paper and copy paper. Since the color of the carbon paper where the nip is applied by the embossing roll 111 is transferred to the copy paper, the nip width can be measured.

  At the same time, the roll winder 110 can perform printing, embossing patterning, perforation, tail sealing, and cutting with a predetermined width (114 mm, etc.), and the toilet roll 1 can be manufactured. Furthermore, the package body of the toilet roll 1 can be manufactured by film packaging processing thereafter.

  The means for ensuring the softness of the toilet paper is not limited to the embossed pattern as long as it provides unevenness on the surface. For example, unevenness may be provided on the web during paper making using an uneven fabric. In this case, the depth of the unevenness may be in a range corresponding to the depth D of an emboss pattern to be described later.

  The pulp composition content is (mass%) 5% NBKP, 60% LBKP, 35% waste paper derived from milk carton, no deinked pulp is contained, and the apparatus shown in FIG. 8 and FIG. The toilet paper and toilet roll shown in 2 were manufactured.

  The following evaluation was performed.

  Basis weight: measured based on JIS P 8124 and converted per sheet.

  Paper thickness: 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. The measurement was repeated 10 times using 10 sheets of toilet paper stacked as a sample, and the measurement results were averaged. The paper thickness can be measured in the same manner for the web before the calendar process and the web after the calendar process.

Specific volume: The paper thickness per sheet was divided by the basis weight per sheet, and expressed as a volume cm ³ per unit g.

  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 N / 25 mm for 1 ply of toilet paper. The tensile strength is measured under the condition of a tensile speed of 300 mm / min.

  Roll winding diameter DR: Measured using a Diameter Rule manufactured by Muratec KDS Corporation. The measurement measured 10 rolls and averaged the measurement results.

  Core outer diameter: Measured using a Diameter Rule manufactured by Muratec KDS Corporation. In the measurement, 10 cores were measured and the measurement results were averaged.

Winding length: About the sheet | seat between the perforation of a toilet roll, the length for 10 sheets was measured. Thereafter, the number of sheets of the roll was 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 2.275 m and the number of sheets is 660, 2.275 m × (660/10) = 150 m. In addition, when there is no perforation, it can measure.
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 the roll mass. The roll mass was obtained by measuring 10 rolls and averaging the measurement results. In addition, when roll width W was different from 114 mm, W was converted into 114 mm and roll mass was calculated | required. For example, when the roll width W is 105 mm, the mass obtained by multiplying the roll mass by a coefficient (114/105) is defined as the roll mass per W of 114 mm.

  The roll winding density, roll density, roll softness, and depth of the embossed pattern were measured by the methods described above. In Table 2, when the depth of the embossed pattern was less than 0.01 mm, it was regarded as a hyphen.

  In addition, although the paper thickness of the toilet paper after the embossing process shown in Table 1 and Table 2 corresponds to the paper thickness t2 in FIG. 3, since it is a value measured at a measurement load of 3.7 kPa, the paper thickness t2 is accurately set. It is not a reflection.

  Further, the depth of the emboss pattern is measured in a state where the emboss pattern is not compressed. Therefore, the depth of the emboss pattern is significantly larger than the value calculated from the paper thicknesses t1 and t2 (this value is a value obtained by compressing the emboss pattern with a measured load of 3.7 kPa).

  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.

  Note that the basis weight, tensile strength, paper thickness, specific volume, core outer diameter, winding length, winding diameter DR, winding density, roll density, roll mass, roll softness, and emboss pattern depth can be measured according to JIS. It was carried out after maintaining the equilibrium state under the temperature and humidity conditions specified in P8111 (23 ± 1 ° C., 50 ± 2% RH).

  The obtained results are shown in Tables 1 and 2.

  As is apparent from Tables 1 and 2, in the case of each example in which the roll length, roll diameter, and roll softness of the toilet roll are within a predetermined numerical range, the softness of the sheet and the roll can be reduced without reducing the basis weight. While improving both, the winding length per roll was able to be lengthened.

  On the other hand, although the softness of the sheet was excellent by providing an emboss pattern with an appropriate depth, in the case of Comparative Example 1 in which the winding length was less than 105 m, the winding diameter was less than 107 mm, and the frequency of roll replacement was increased. It was.

  Moreover, although the softness of the sheet | seat was excellent by providing the embossing pattern of moderate depth, in the case of the comparative example 2 where the winding length exceeded 210 m, the winding diameter exceeded 140 mm, the roll diameter became large, and the toilet It became difficult to fit in the paper holder.

  In the case of Comparative Example 3 in which the depth D of the emboss pattern is less than 0.01 mm and the roll softness is less than 0.3 mm, the degree of unevenness of the emboss pattern is reduced and the bulk is reduced (the density is increased). The softness of the sheet and roll was inferior.

  In the case of Comparative Example 4 in which the depth D of the embossed pattern exceeds 0.35 mm and the roll softness exceeds 1.5 mm, the unevenness of the embossed pattern becomes excessive and the bulk becomes too high (the density becomes too low). ), The roll diameter of the toilet roll exceeded 140 mm, and the roll diameter became large, making it difficult to fit in the toilet paper holder.

  In the case of Comparative Example 5 in which the toilet paper was wound too strongly (hardly) with a roll winder and the roll softness was less than 0.3 mm, the roll diameter was less than 107 mm, and the roll softness was inferior.

  In the case of Comparative Example 6 in which the toilet paper is weakly (softly) wound by a roll winder and the roll softness exceeds 1.5 mm, the roll diameter of the toilet roll exceeds 140 mm, and the roll diameter increases. It became difficult to fit in the holder.

  The point that the roll diameter and roll softness were within the predetermined numerical ranges in the present invention is that, in Comparative Example 7 corresponding to Comparative Example 6, the fit to the toilet paper holder was good, but the winding length Became less than 105 mm, and the replacement frequency of the roll increased.

  The point that the winding length and roll softness were within the predetermined numerical range in the present invention was that in Comparative Example 8 corresponding to Comparative Example 3, the evaluation of the softness of the roll was good, but the emboss pattern Since the depth of the sheet was less than 0.01 mm, the evaluation of the softness of the sheet was inferior.

  In addition, when the commercial products 1 and 2 were similarly evaluated, all had a winding length of less than 105 m, and the roll replacement frequency increased.

DESCRIPTION OF SYMBOLS 1 Toilet roll 11 Reel 12 Original fabric roll 13 Base paper roll 100 Machine winder 101 1st stack calendar machine 102 2nd stack calendar machine 110 Roll winding machine 111 Emboss roll 112 Rubber roll 113 Winding mechanism 114 Rider roll 2 Emboss pattern (Single embossed pattern)
2R Concave part 2P Convex part

Claims (5)

A toilet roll obtained by winding a roll of toilet paper of 1 ply,
An emboss pattern is provided on the toilet paper,
A toilet roll having a roll length of 105 to 210 m, a roll diameter of 107 to 140 mm, and a roll softness of 0.3 to 1.5 mm.   The toilet roll according to claim 1, wherein a depth of the emboss pattern is 0.01 mm or more and 0.35 mm or less.   The toilet roll according to claim 1 or 2, wherein the toilet paper contains 40% by mass to 100% by mass of kraft pulp.   The toilet roll according to any one of claims 1 to 3, wherein the toilet paper contains 0% by mass to 60% by mass of waste paper pulp derived from milk carton.   Through a filter that cuts off UV light having a wavelength of 420 nm or less, and whiteness UV-in conforming to ISO 2470 when the surface of the toilet paper is irradiated with a C light source defined by the CIE (International Commission on Illumination) 5. The difference Δ from the whiteness UV-cut based on ISO 2470 when the surface of the toilet paper is irradiated with the C light source is 0.0 point or more and 2.5 point or less. 5. Toilet roll as described in