JP2019187769A - Toilet roll - Google Patents

Abstract

To provide a toilet roll which reduces replacement frequencies of a roll by increasing a winding length without decreasing a basis weight, is user-friendly by providing perforations, has a small quality difference between an outer roll of the roll and an inner roll, and is excellent in space saving properties in carriage and storage.SOLUTION: A toilet roll 10 is configured by winding up 1-ply toilet tissue paper 10x which has a plurality of irregularities 2 formed of a protruding part on one surface and a recessed part on a corresponding opposite surface and has perforations 10m in a width direction in a rolled shape. A basis weight per the 1-ply toilet tissue paper is 12 to 21 g/m, a winding length is 150 to 260 m, and a pitch ratio H which is expressed as (an average pitch P1 (mm) of the perforations of the outermost winding toilet tissue paper)/(an average pitch P2 (mm) of the perforations of the innermost winding toilet tissue paper) is 1.002 to 1.017.SELECTED DRAWING: Figure 4

Description

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

Toilet papers that are packaged mainly in units of 4 rolls or 12 rolls 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. Storage space is also limited in homes, workplaces, and public facilities.
Therefore, the applicant of the present application 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) Reference 1). Moreover, the toilet roll which improved the winding density and winding hardness is developed (for example, refer patent document 2, 3).

JP 2014-233363 A Japanese Unexamined Patent Publication No. 2016-202801 JP 2016-209487

  By the way, long toilet paper rolls need to be tightly wound so that the roll diameter is not larger than that of the toilet paper holder. It is necessary to improve the tactile sensation of the sheet. In particular, in the case of an ultra-long roll wound with a very long length without lowering the basis weight (wind length of 150 to 260 m with one ply), there is a large difference in quality (tactile feeling) between the first outer winding and the inner winding, and the quality is Not stable.

  Therefore, the present invention can increase the winding length per roll without lowering the basis weight and reduce the frequency of roll replacement, has perforations and is easy to use, and the quality of the roll outer roll and the inner roll. The purpose is to provide a one-ply toilet roll that is small in difference and excellent in space saving during carrying and storage.

In the ultra-long roll wound very long without lowering the basis weight, the inventors have determined the degree of roll winding strength as a measure to reduce the difference in quality (tactile feeling) between the outer roll and the inner roll. Has been found to vary between the outermost winding region and the innermost winding region.
Specifically, the inner winding that is easy to compress is softly wound so that the emboss is not crushed, and the outer winding that is difficult to compress is hard to be crushed, so it is difficult to crush the embossing. I found that I can make it smaller.
Further, as an index of the roll winding strength, it has been found that the perforation pitch (distance between perforations in the longitudinal direction) that is inserted into the sheet at equal intervals in principle varies between the inner winding and the outer winding. .

In order to solve the above-described problem, the toilet roll of the present invention is a one-ply toilet paper having a plurality of projections and recesses on one side and having a perforation along the width direction. Toilet roll, in which the basis weight per ply of the toilet paper is 12 to 21 g / m ² , the roll length is 150 to 260 m, (the outermost roll of the toilet roll with the toilet roll loosened) The pitch ratio H expressed by the average pitch P1 (mm) of the perforation of the paper / (average pitch P2 (mm) of the perforation of the innermost winding of the toilet roll) is 1.002 to 1.017. A toilet roll. However, the average pitch P1 is two first continuous portions having a length of 1000 mm or more and both ends being the perforations in the first region of 1 to 5 m from the edge of the outermost toilet paper. Average pitch when taken out above; The average pitch P2 is a second continuous region having a length of 1000 mm or more in the second region of 30 m to 40 m from the edge of the innermost toilet paper, and both ends being the perforations. Average pitch when 5 or more parts are taken out separately

  In the toilet roll of the present invention, 100 mN and 600 mN of a roll-shaped rotor is not rotated with respect to a sheet-like sample with the outer surface of the toilet roll installed on the sample table up by the tissue softness measuring device TSA. When the pressing force is pressed from above, the stiffness value represented by the amount of deformation in the vertical direction of the sheet-like sample between the pressing pressures of 100 mN and 600 mN is defined as D value, and the sheet of the first continuous portion The D value of the sample is preferably 1.5 to 3.6 mm / N.

The average pitches P1 and P2 are preferably 70 to 500 mm.
It is preferable that the tensile strength DMDT based on JIS P8113 of the toilet paper 1 ply not including the perforation is 2.3 to 8.0 N / 25 mm.
It is preferable that the tensile strength DCDT based on JIS P8113 of the toilet paper 1 ply not including the perforation is 0.6 to 4.0 N / 25 mm.
The tensile strength DMDT based on JIS P8113 of the perforation of the toilet paper 1 ply is preferably 4.6 to 18.3 N / 114 mm.
It is preferable that the winding density of the toilet roll is 1.2 to 2.1 m / cm ² .
It is preferable that the roll density of the toilet roll is 0.23 to 0.37 g / cm ³ .

  According to the present invention, it is possible to increase the winding length per roll without lowering the basis weight, and to reduce the frequency of roll replacement. It is possible to obtain a one-ply toilet roll that is small in quality and excellent in space saving during carrying and storage.

It is a perspective view which shows the external appearance of the toilet roll which concerns on embodiment of this invention. It is sectional drawing which shows the embossing provided in the roll surface and the back surface. It is a figure which shows an example of a roll winding processing machine. It is a figure which shows the measuring method of average pitch P1, P2. It is a figure which shows a perforation roll. It is a figure which shows the measurement principle of tissue softness measuring apparatus TSA. It is a figure which shows the measuring method of the rigidity D of the paper sample sheet-like sample by TSA. It is a figure which shows the measuring method of emboss depth. It is another figure which shows the measuring method of emboss depth.

Preferred embodiments of the present invention will be described below, but these are given for illustrative purposes and do not limit the present invention.
As shown in FIG. 1, a toilet roll 10 according to an embodiment of the present invention is a toilet roll in which 1 ply of toilet paper 10x having a plurality of irregularities (embosses) and having a perforation 10m is wound in a roll shape. The basis weight is 12 to 21 g / m ² , the winding length is 150 to 260 m, and the pitch ratio is represented by (average pitch P1 of the outermost perforation) / (pitch P2 of the innermost perforation). 1.002 to 1.017.
In addition, let the surface of the roll outer side of the toilet paper 10x be the roll surface (or the surface of the toilet paper) 10a, and let the surface inside the roll be the roll back surface (or the back surface of the toilet paper) 10b.

When the roll length of the toilet roll 10 is less than 150 m, the roll length per roll is shortened and space saving during storage cannot be achieved. When the roll length exceeds 260 m, the roll mass becomes too high (heavy), and the roll does not rotate well with the toilet paper holder.
The winding length is preferably 165 to 240 m, more preferably 180 to 220 m.

When the basis weight per ply (one sheet) of the toilet paper 10x is less than 12 g / m ² , the length when the toilet paper is used becomes long, and conversely, the frequency of replacing the roll increases. At the same time, the feeling of use (bulkiness) also decreases. When the basis weight per ply of the toilet paper 10x exceeds 21 g / m ² , the roll mass becomes too high (heavy) and the roll does not rotate well with the toilet paper holder.
The basis weight is preferably 14 to 20 g / m ² , more preferably 17 to 19 g / m ² .

<Unevenness>
The toilet roll 10 (toilet paper 10x) of the present invention has a plurality of projections and depressions on one surface which are convex portions and corresponding opposite surfaces are concave portions. This unevenness can be applied by embossing, for example. In particular, single embossing is preferable. Further, the emboss pattern (emboss size, depth, number, area ratio) can be changed as appropriate.

As shown in FIG. 3, the single embossing is formed by pressing the embossing convex portion of the embossing roll 151 only from one surface of the toilet paper 10 x.
As shown in FIG. 3, the single embossing is formed by pressing the embossing convex portion of the embossing roll 151 only from one surface of the one-ply toilet paper 10 x.
FIG. 3 shows an example of a roll winding machine 150. The base paper roll is preliminarily calendared to become a raw fabric 4. This raw fabric 4 is set on a roll winding machine 150 and subjected to a single embossing process by an embossing unit (embossing roll) 151, and then wound around a wide toilet paper roll 10W having the above winding diameter by a winding mechanism 153. Taken. Thereafter, the original roll 10W is cut into a predetermined width (114 mm or the like) to form the toilet roll 10.

FIG. 2 is a cross-sectional view showing the single emboss 2 provided on the toilet roll 10 (toilet paper 10x). In the example of FIG. 2, the toilet paper 10x has a single ply sheet, and the upper part of FIG. 2 corresponds to the roll surface 10a side. The embossing (single embossing) 2 in which the concave portion 2R appears on the surface of the toilet paper 10x against which the embossing roll 151 is pressed (the surface in FIG. 2) and the convex portion 2P appears on the back surface is formed.
2A shows a case where the emboss depth is deep, and FIG. 2B shows a case where the emboss depth is shallow.

The emboss depth is preferably 0.01 to 0.40 mm, more preferably 0.04 to 0.30 mm, and still more preferably 0.07 to 0.20 m. When the emboss depth is less than 0.01 mm, the tactile sensation may be inferior. On the other hand, when it exceeds 0.40 mm, the winding density becomes small and space saving may not be achieved.
As will be described later, by defining the perforation pitch and changing the winding strength between the inner and outer windings, the emboss depth is appropriate for both the inner and outer windings, even for ultra-long toilet rolls. Thus, the difference in quality between the inner and outer windings can be further reduced.

The emboss depth can be measured using a microscope as shown in FIG. As the microscope, a product name “One-shot 3D measurement microscope VR-3100” manufactured by Keyence Corporation 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.
The measurement surface of the emboss 2 is a roll surface 10a, and the emboss 2 that is continuous in the width direction W is measured in the first region S1 of the toilet paper 10x of the toilet roll 10 while the toilet roll 1 remains in a roll shape. Note that if the measurement is performed in the roll shape, it may be difficult to focus the microscope. In this case, the stage (table) on which the sample is placed may be removed and the focus may be adjusted for measurement.

First, as shown to Fig.8 (a), the two-dimensional uneven | corrugated image of the XY plane of the said visual field is obtained with a microscope. In the concavo-convex image, it can be seen that the height of the surface of the toilet paper 10x is expressed by shading.
Next, when the operator draws a line segment LS1 (see FIG. 9) in the width direction W so as to straddle the deepest part of the plurality of embosses 2 arranged along the width direction W, the result is shown in FIG. Thus, a (measurement) cross-sectional curve (cross-sectional profile) representing the unevenness is obtained.
Here, the (measurement) cross-sectional curve in FIG. 8 (b-1) is a (measurement) cross-sectional curve representing the unevenness of the surface of the toilet roll, but there is noise (fiber lump on the surface of the toilet roll or fibers In addition, the noise peaks are removed when calculating the height difference of irregularities and the area ratio shown below. There is a need.

Therefore, using the above analysis software, the (measurement) cross-sectional curve in FIG. 8B-1 is smoothed by setting the filter size of the weighted average radio button to ± 12, and noise removal in FIG. 8B-2 is performed. Obtain a later cross-sectional curve.
Then, in the graph shown in FIG. 8B-2, an average value HM of the maximum values of the heights of the convex portions of the graph and the vertical axes of the convex portions adjacent to the convex portions is calculated. Further, the minimum value HL of the height of the vertical axis in the concave portion sandwiched between these two convex portions is obtained. A value obtained by subtracting the minimum value HL from the average value HM of the maximum values obtained in this way is defined as the depth of the emboss 2. When the above-described measurement is performed on the four continuous convex portions and the three concave portions sandwiched between the convex portions on the cross-sectional curve shown in FIG. 8B-2, a total of three depth measurement results of the emboss 2 are obtained. .

As shown in FIG. 9, the cross-sectional profile shown in FIG. 8B-1 is measured for a total of four line segments LS1 to LS4. Specifically, after obtaining a two-dimensional concavo-convex image (see FIG. 8A) for the field of view at a position of 90 degrees in the circumferential direction from the line segment LS1 along the surface of the toilet roll 10, Similarly, the line segment LS2 is drawn to obtain a cross-sectional profile similar to that shown in FIG. This is similarly performed at a position of 180 degrees and 270 degrees in the circumferential direction from the line segment LS1, and a cross-sectional profile is obtained for each of the line segments LS3 and LS4.
As described above, since three emboss depth values are obtained for one line segment, an average value of a total of twelve emboss depth values is employed.
The pitch in the width direction on the profile (the distance between the convex portion and the convex portion adjacent to the convex portion) is preferably 1 mm or more and 12 mm or less, and more preferably 2 mm or more and 10 mm or less. By making the pitch in the width direction within the above range, it is possible to maintain good tactile sensation during use.

  The unevenness is not limited to embossing, and for example, an uneven fabric may be used to make the web uneven during paper making.

<Average pitch P1, P2 of perforation>
The pitch ratio H represented by (average pitch P1 (mm) / average pitch P2 (mm)) is 1.002 to 1.017.
Here, average pitches P1 and P2 are obtained as shown in FIG.
First, the average pitch P1 is a length of 1000 mm or more in the first region S1 of 1 m to 5 m from the edge 10e1 of the outermost toilet paper 10x1 wound with a toilet roll, and both ends thereof are 10 m perforations. This is an average pitch when two or more continuous portions C1 are taken out separately.
Specifically, for example, in FIG. 4, as the first continuous portion C1, a portion where the six perforations 10m are continuous is separated by the perforations 10m at both ends, and the MD (longitudinal) direction of the first continuous portion C1 is cut. The length L1 is measured. Then, L1 is divided by the number of pitches formed by the adjacent perforations 10m in the first continuous portion C1 (5 pitches are formed by 6 perforations 10m in FIG. 4) (L1 / 5). Thus, the average pitch P1 can be obtained.
Two or more of the first continuous portions C1 are taken out at separate positions in the longitudinal direction of the first region S1, the average pitch P1 of each C1 is obtained by the above method, the average pitch P1 of each C1 is further averaged, and the final A typical average pitch P1 is used. The number of continuous perforations in the separate first continuous portion C1 may not be the same.

Similarly, the average pitch P2 is a length of 1000 mm or more in the second region S2 of 30 m to 40 m from the edge 10e2 of the innermost toilet paper 10x2 loosened with the toilet roll, and both ends thereof are 10 m perforations. The average pitch when five or more of the two continuous portions C2 are taken out separately.
Specifically, as in the case of the average pitch P1, as the second continuous portion C2, a portion where the seven perforations 10m are continuous is cut and the length L2 is measured. The average pitch P2 can be obtained by dividing L2 by the number of pitches formed by seven adjacent perforations 10m (six pitches in FIG. 4) (L2 / 6).
Five or more of the second continuous portions C2 are taken out at separate positions in the longitudinal direction of the second region S2, the average pitch P2 of each C2 is obtained by the above method, and the average pitch P2 of each C2 is further averaged to obtain a final value. A typical average pitch P2 is used. The number of continuous perforations in the separate second continuous portion C2 may not be the same.

  When measuring L1 and L2, one end in the longitudinal direction of the toilet paper 10x2 including the first region S1 and the second region S2 is fixed above the vertical wall surface, and the longitudinal direction is directed upward and downward. The other end of 10 × 2 is suspended by its own weight so that the other end is along the wall surface and is not fixed without being tensioned.

Further, if the first continuous portion C1 and the second continuous portion C2 are each a portion having a length of 1000 mm or more, 4 significant digits can be sufficiently obtained as the pitch ratio H (P1 / P2).
For example, in Example 5 to be described later, the length L1 of the first continuous portion C1 is 1153 mm, the perforation is 6 pieces, the length L2 of the second continuous portion C2 is 1145 mm, and the perforation is 6 pieces. It was. As a result, the average pitch P1 = L1 / 5 = 230.6 mm and the average pitch P2 = L2 / 5 = 229.0 mm are obtained, and four significant figures are obtained, and the pitch ratio H = 230.6 / 229.0 = 1. 007 was able to secure 4 significant figures.

Next, the reason for defining the pitch ratio H will be described with reference to FIG.
As shown in FIG. 5, the perforation roll 300 is installed in the roll winding machine 150 of FIG. 3, and four blades 301 spaced at a reference perforation pitch P are arranged in the circumferential direction of the rotation axis. They are arranged at equal intervals of 90 degrees. The reference perforation pitch P is the length of an arc of a circular arc that passes through the tips of adjacent blades 301 and is centered on the center of the rotation axis.
Therefore, for example, when the reference perforation pitch P is set to 229 mm, if the perforation 10 m is provided in a state where the tension at the time of winding the toilet paper 10 x is weakened, the pitch (about 229 mm) equal to the reference perforation pitch P is obtained. Become.
On the other hand, when the perforation 10m is provided in a state where the tension at the time of winding the toilet paper 10x is increased, the pitch becomes larger than the reference perforation pitch P (for example, 231 mm).
In other words, the average pitches P1 and P2 reflect the strength of winding of the outer and inner windings of the toilet paper 10x, and when the pitch ratio H (P1 / P2) exceeds 1.002, P1 is longer than P2. Softly wrap the inner winding that is easy to compress so that the emboss is not crushed, and the outer winding that is difficult to compress is hard to crush even if it is tightly wound. The quality difference between the inner winding and the outer winding can be reduced without being excessive.

When the pitch ratio H is less than 1.002, the inner winding strength is relatively strong, the quality of the inner winding is inferior, and the quality difference between the inner winding and the outer winding becomes large.
In addition, even if the inner volume is weakened and the quality is ensured, if the outer volume is weaker than that, the quality of the outer volume is too good for the inner volume. The quality difference between the inner volume and the outer volume becomes large. Further, since the entire roll cannot be wound relatively tightly, the winding diameter becomes excessive in the ultra-long roll, and space saving cannot be achieved.

When the pitch ratio H exceeds 1.017, the winding strength of the outer winding becomes too strong compared to the inner winding, the quality of the outer winding is inferior, and the quality difference between the outer winding and the inner winding becomes large.
The pitch ratio H is preferably 1.003 to 1.013, more preferably 1.004 to 1.010.

  The average pitches P1 and P2 are preferably 70 to 500 mm, more preferably 130 to 350 mm, and still more preferably 200 to 250 mm. By setting the average pitches P1 and P2 to 70 to 500 mm, it becomes easy to use individual sheet sizes separated by perforations.

Using tissue softness analyzer TSA (Tissue Softness Analyzer), 100mN and 600mN without rotating the bladed rotor on a 1-ply sheet-like sample with the outer surface 10a of the toilet roll installed on the sample table facing up The value of rigidity represented by the amount of deformation in the vertical direction of the sheet-like sample between the indentation pressures of 100 mN and 600 mN is defined as the D value.
At this time, it is preferable that D value of the sheet-like sample of the 1st continuous part C1 (outer winding) of FIG. 4 is 1.5-3.6 mm / N, More preferably, it is 1.9-3.1 mm / N. More preferably, it is 2.3 to 2.8 mm / N.
The higher the D value, the better the flexibility. When the D value is less than 1.5 mm / N, the flexibility may be inferior. On the other hand, if the D value exceeds 3.6 mm / N, it may be easily broken.

  Here, as shown in FIG. 6, the tissue softness measuring device TSA 210 performs vibration analysis on vibration data detected by various sensors when the rotated bladed rotor 204 is pressed on the paper sample (sample) 206. By parameterizing (TS value), the softness of the paper (feel) is quantitatively evaluated. The product name of Emtec Electronic GmbH (Germany is Japan Luft Co., Ltd.) It is.

Specifically, using TSA, (i) a sample 206 (sample processed into a circle having a diameter of about 113 mm) is placed so as to cover the circular sample stage 205 from the outside, and the outer periphery of the sample 206 is placed on the sample fixing ring 208. (Ii) After the bladed rotor 204 was pushed from above the sample 206 with a pushing pressure of 100 mN, the rotor 204 was rotated at a rotation speed of 2.0 (/ sec), and (iii) the vibration of the sample stage 205 was Measurement is performed by the vibration sensor 203 installed in the sample stage 205, and the vibration frequency is analyzed. (iv) Next, when the indentation pressure is 100 mN and 600 mN, the amount of deformation (mm / N, rigidity D) in the vertical direction when the sample 206 is deformed without rotating the rotor 204 is measured.
By the procedures (i) to (iv), the elements (smoothness, suppleness, volume) of the total hand feel value of the product can be quantified. The measurement is performed 5 times per sample and averaged.
When making samples, avoid perforations. However, if the perforation pitch is smaller than 113 mm, the sample may be perforated.

The sample stage 205 is installed on the base plate 201, and a force sensor 202 is disposed between the sample stage 205 and the base plate 201. Then, the pushing pressure of the bladed rotor 204 is controlled by the detection value of the force sensor 202. The bladed rotor 204 is rotated by a motor 209.
In addition, emtec measurement system is used as software for analyzing vibration and parameterizing (TS value). This software is equipped with various algorithms (for example, Base Tissue, Facial, TP, etc.), TS7, TS750, D (rigidity) is automatically acquired on the software, and these TS7, TS750, D and basis weight The HF (hand feel) value is calculated according to the type of various algorithms from the thickness, the Ply number, and the like. In the present invention, only the TS7, TS750, and D are defined, not the HF values, and any algorithm may be used as long as the above measurement conditions are satisfied. The values of TS7, TS750, and D depend on the algorithm type. It will not change.
FIG. 7 shows a method for measuring the stiffness D of a paper sample sample by TSA.

After the above-mentioned tissue softness measuring device TSA pushes the bladed rotor from above into a 1-ply sheet-like sample with the outer surface 10a of the toilet roll installed on the sample table facing upward, as a pushing pressure of 100 mN When rotating at a rotation speed of 2.0 (/ sec) and measuring the vibration of the sample stage with a vibration sensor, the intensity of the maximum peak of the first spectrum from the low frequency side automatically acquired by software on the TSA ( TS750) is preferably 9 to 32 dBV ² rms, more preferably 12 to 27 dBV ² rms, still more preferably 14 to 22 dBV ² rms, and the peak intensity (TS7) of the spectrum including 6500 Hz is 9 to 30 dBV ² rms, more preferably 12~26dBV ² rms, more preferably 14~22d A V ² rms.
By setting TS750 and TS7 within the above range, the quality difference between the inner winding and the outer winding is more reliably reduced.

DMDT (Dry Machine Direction Tensile strength) is the tensile strength in the dry direction based on JIS P8113 of toilet paper (one-ply sheet) without perforation, and DCDT (Dry) is the tensile strength in the horizontal direction when drying. Cross Direction Tensile strength), DMDT is preferably 2.3 to 8.0 N / 25 mm, more preferably 2.8 to 6.8 N / 25 mm, and still more preferably 3.8 to 5.3 N / 25 mm. . DCDT is preferably 0.6 to 4.0 N / 25 mm, more preferably 0.8 to 3.0 N / 25 mm, and still more preferably 1.0 to 2.0 N / 25 mm.
If DMDT and DCDT are less than the above values, they may be easily shaken and not suitable for practical use. If DMDT and DCDT are higher than the above values, the sheet becomes hard and the softness of the sheet may be impaired.
The flow direction of toilet papermaking is defined as “longitudinal direction”, and the direction perpendicular to the flow direction is defined as “lateral direction”.

The tensile strength DMDT based on JIS P8113 with a 10 m perforation of toilet paper (1 ply sheet) is preferably 4.6 to 18.3 N / 114 mm, more preferably 5.3 to 16.3 N / 114 mm, still more preferably 7.3 to 10.3 N / 114 mm.
If the DMDT is less than 4.6 N / 114 mm, the web may be cut at the perforation due to the tension when winding the toilet paper 10x. When the DMDT exceeds 18.3 N / 114 mm, it may be difficult to cut at the perforation when the toilet paper is used.

DMDT including perforation 10m is a strip shape with the MD direction of the sheet (toilet paper) 10x shown in FIG. 4 as the longitudinal direction of length L1 = 150 mm, and the tensile test piece having width W as its own width direction is cut out. To measure. If the distance between the gripping tool and the gripping tool of the tensile tester is set to 100 mm and this distance can be secured to 100 mm, there is no effect even if the test piece length L1 is shorter than 150 mm. One perforation 10m is made to enter approximately the center in the longitudinal direction of the test piece. Then, the measurement is performed by pulling in the MD direction at a tension speed of 300 mm / min before and after the perforation 10 m so as to divide one perforation 10 m. If the perforation is not included and the distance between the gripping tool of the tensile tester is not 100 mm, the measurement is performed so that the distance is 50 mm and the perforation is not included.
In the case of measurement of DMDT and DCDT that do not include a perforation, the measurement is performed in the same manner except that a test piece that does not have a perforation of 10 m is used.

In addition, when the width Y of the gripping tool is smaller than 114 mm, the sheet is folded along the MD direction so as to have a width Z (the width Z may be equal to or smaller than the width Y), pulled at the width Z, and the DMDT at that time is It may be adopted as it is. For example, when the sheet width is 114 mm, if the sheet is folded in half so that the half width Z = 57 mm, the width is ½ and the thickness (number of sheets) is doubled. This is because it becomes the same as in the case of a width of 114 mm.
In general, DMDT is measured with a width of 25 mm. In this case, since the measured value varies depending on the number and length of the perforated part of the perforation and the cut line, the measurement is performed with a width close to the roll width W. Thus, it is preferable to measure by folding a sheet having a roll width W to a width of 25 mm.
When the roll width W is different from 114 mm, DMDT is obtained by converting W into 114 mm. For example, when the roll width W is 105 mm, a value obtained by multiplying the DMDT by a coefficient (114/105) is DMDT per 114 mm.

The winding diameter DR is preferably 106 to 154 mm, more preferably 120 to 146 mm, and still more preferably 125 to 135 mm.
If the winding diameter DR is less than 106 mm, the winding length may be shortened. When the winding diameter DR exceeds 154 mm, the roll mass becomes high, and the roll may be difficult to rotate with the toilet paper holder.

  The roll width W is preferably 104 to 120 mm, more preferably 107 to 118 mm, and still more preferably 110 to 116 mm. When the roll width is less than 104 mm, the sheet size becomes small, and when the roll width exceeds 120 mm, the sheet size becomes large and may be difficult to use.

The sheet thickness is preferably 0.5 to 1.1 mm / 10 sheets, more preferably 0.6 to 1.0 mm / 10 sheets, and still more preferably 0.7 to 0.9 mm / 10 sheets.
When the sheet thickness is within the above range, the tactile sensation when using toilet paper is improved. Moreover, since it becomes easy to adjust winding length in the said range, it is preferable.
As a method of adjusting the sheet basis weight and paper thickness to the above ranges, the calender conditions (paper thickness and specific volume after calendering) and embossing conditions of the base paper web are defined.

The specific volume of the toilet paper is preferably 3.2 to 6.3 cm ³ / g, more preferably 3.7 to 5.5 cm ³ / g, and even more preferably 4.3 to 5.1 cm ³ / g.
If the specific volume is less than 3.2 cm ³ / g, the softness of the sheet may be poor. On the other hand, if the specific volume exceeds 6.3 cm ³ / g, the paper thickness increases, the winding density and the roll density decrease, and space saving may not be achieved.

The roll mass not including the core (core paper tube) with a roll width W of 114 mm is preferably 240 to 560 g, more preferably 325 to 530 g, and still more preferably 370 to 480 g.
Here, 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.
When the roll mass is less than 240 g, the winding length per roll is shortened, and space may not be saved during storage. When the roll mass exceeds 560 g, the roll mass becomes high, and the roll may be difficult to rotate with the toilet paper holder.

The roll density of the roll is preferably 1.2 to 2.1 m / cm ² , more preferably 1.3 to 2.0 m / cm ² , and still more preferably 1.5 to 1.7 m / cm ² .
The winding density is a factor for expressing the winding strength of the roll.

The winding density is expressed by (winding length × number of plies) ÷ (cross-sectional area of 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). The core outer diameter DI (see FIG. 1) is the diameter of the center hole of the roll. When a core (core paper tube) is mounted inside the roll, the core outer diameter corresponds to DI.
If the winding density is less than 1.2 m / cm ² , the outer winding will be softly wound, and the quality difference between the inner winding and the outer winding may increase (the outer winding has better quality than the inner winding). Pass). Moreover, the winding diameter per winding length becomes large, and space saving may not be achieved.
When the winding density exceeds 2.1 m / cm ² , the inner winding is further compressed, so that the embossing provided on the toilet paper may be crushed and the quality difference between the inner winding and the outer winding may increase (inner winding). Is inferior to the outer volume). In addition, since the basis weight may be low, the roll replacement frequency may be inferior.

The roll density is expressed by (roll mass (excluding core)) / (roll volume). The roll volume is represented by [{cross-sectional area of the outer diameter of the roll (winding diameter DR) portion) − (cross-sectional area of the core outer diameter portion)] × roll width (converted per 114 mm).
Here, when the toilet paper is tightly wound, the roll density becomes high, and when the toilet paper is softly wound, the roll density becomes low. Further, the winding density depends on the winding length and the winding diameter, but the roll density includes the influence of mass (basis weight). Therefore, the roll density is an index of the quality difference between the inner volume and the outer volume even when the basis weight is changed.

The roll density is preferably 0.23 to 0.37 g / cm ³ , more preferably 0.26 to 0.34 g / cm ³ , and still more preferably 0.28 to 0.31 g / cm ³ . When the roll density is less than 0.23 g / cm ³ , the outer winding is wound softly, and the quality difference between the inner winding and the outer winding may increase (the quality of the outer winding is too good for the inner winding). ). In addition, space saving per winding length may not be achieved.
On the other hand, when the roll density exceeds 0.37 g / cm ³ , the inner winding is further compressed, and the embossing provided on the toilet paper may be crushed, resulting in a large quality difference between the inner winding and the outer winding (inner The quality of the winding is inferior to that of the outer winding).

  By making the winding density or roll density within the above range, the quality difference between the inner winding and the outer winding can be surely reduced.

  The outer diameter of the core (winding core) is preferably 35 to 45 mm, more preferably 37 to 42 mm. In the case of a toilet roll without a core, the inner diameter of the toilet roll is regarded as the outer diameter of the core.

FIG. 3 shows an example of a roll winding machine 150. The base paper roll is calendered to become a raw fabric 4 (sheet thickness t1 of the sheet). This raw fabric 4 is set on a roll winding machine 150 and subjected to a single embossing process by an embossing unit (embossing roll) 151, and then wound around a wide toilet paper roll 10W having the above winding diameter by a winding mechanism 153. Taken. Thereafter, the original roll 10W is cut into a predetermined width (114 mm or the like) to form the toilet roll 10.
The roll winding machine 150 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. The wound toilet roll 10 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 10 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.

  In addition, the winder 100 is incorporated into the roll winder 150, or both the calendars 101 and 102 (two stacks) or one (one stack) is incorporated into the roll winder 150, and calendar processing is performed with the roll winder. The embossing process may be performed in this order.

  At the same time, the roll winder can perform printing, embossing, perforation, tail sealing, and cutting with a predetermined width (114 mm, etc.), and the toilet roll 10 can be manufactured. Furthermore, the package body of a toilet roll can be manufactured by film packaging processing after that.

Toilet paper may consist of 100% by weight of wood pulp, and may include waste paper pulp, non-wood pulp, and deinked pulp. In order to obtain the targeted quality, the content of NBKP (conifer bleached kraft pulp) is preferably 0 to 30% by mass, more preferably 0 to 20% by mass, and still more preferably 0 to 10% by mass. The content of LBKP (hardwood bleached kraft pulp) is preferably 30 to 90% by mass, more preferably 40 to 80% by mass, and still more preferably 50 to 70% by mass.
Moreover, the content rate of waste paper pulp derived from liquid beverages such as milk cartons is preferably 0 to 60% by mass, more preferably 10 to 50% by mass, and still more preferably 20 to 45% by mass. Is preferably 40 to 100% by mass, more preferably 50 to 90% by mass, and still more preferably 55 to 80% by mass.
Waste paper pulp derived from liquid beverages such as milk cartons is mainly softwood pulp and has the advantage of ensuring the strength of toilet paper. On the other hand, if the content is too high, the quality of the product will be affected. Therefore, it is preferable to make it the content rate of said range.
Pulp produced from Eucalyptus eucalyptus represented by Eucalyptus genus Grandis and Eucalyptus globulus is preferred as the grade of LBKP.

  In addition, 25 parts by mass or less of deinked pulp derived from newspaper or magazine waste paper can be blended with 100 parts by weight of waste paper pulp derived from liquid beverages such as NBKP, LBKP, and 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 0 to 20% by mass, preferably 0 to 10% by mass, more preferably 0 to 5% by mass or less, and most preferably 0% by mass. Since deinked pulp is also waste 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.

If 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 a whiteness degree based on ISO 2470 when a C light source (including ultraviolet light) defined by CIE (International Commission on Illumination) is irradiated on the sheet surface side. UV-cut is the whiteness based on ISO 2470 when a C light source is irradiated on the sheet surface side through a filter that cuts ultraviolet light having a wavelength of 420 nm or less. Difference Δ = (whiteness UV-in) − (whiteness UV-cut).
The difference Δ is preferably 0.0 to 2.5 points, more preferably 0.0 to 1.5 points, still more preferably 0.0 to 1.0 points, and most preferably 0.0 to 0.5 points. It is. The whiteness can be measured using a high-speed spectrophotometer CMS-35SPX manufactured by Murakami Color Research Laboratory Co., Ltd. according to ISO 2470.

  In addition, in order to ensure an appropriate strength for the toilet paper, the raw materials can be blended by a usual means, and the strength can be adjusted by a beating process of pulp fibers. As the beating to obtain the target quality, 0 to 200 ml, more preferably 0 to 150 ml, and more preferably 10 to 100 ml of a Canadian standard freeness measured by JIS-P8121 is used for commercially available virgin pulp. Reduce water content.

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.
When using waste paper raw material as toilet paper, the same treatment as in the case of the virgin is performed.

  Toilet paper can be manufactured, for example, in the order of (1) papermaking and creping, (2) calendering, (3) embossing and roll winding.

  It goes without saying that the present invention is not limited to the above-described embodiments, and extends to various modifications and equivalents included in the spirit and scope of the present invention.

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

The following evaluation was performed.
Based on DMDT and DCDT: JIS P8113 of perforation and other parts, the maximum load until breakage was measured for 1 ply of toilet paper. Specific test pieces and measurement methods are as described above.
Basis weight: Measured based on JIS P8124, 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 performed with 10 sheets stacked. The measurement was repeated 10 times and the measurement results were averaged.

Specific volume: The thickness per sheet was divided by the basis weight per sheet, and expressed as a volume cm ³ per unit g.
Roll mass and core mass: Measured using an electronic balance. The measurement measured 10 rolls and averaged the measurement results.
Roll roll diameter DR, core outer diameter DI: Measured using a Diameter Rule manufactured by Muratec KDS Corporation. The measurement measured 10 rolls and averaged the measurement results.
The winding density of the roll was measured by the method described above. In addition, the winding density of the roll measured 10 rolls used for the measurement of the roll winding diameter DR, and averaged the measurement results.

  The average pitches P1 and P2 were measured as described above.

Sensory evaluation was performed by 20 monitors. The evaluation standard was a perfect score. If the evaluation criteria is 3 points or more, it is good.
The basis weight, tensile strength, thickness (paper thickness), roll mass and core mass, specific volume, winding diameter DR, core outer diameter DI, winding density, and average pitches P1 and P2 are 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 basis weight, tensile strength, thickness (paper thickness), and specific volume were measured with samples cut out from both the first region S1 of the outer volume and the second region S2 of the inner volume, and the values were averaged. did.

  The obtained results are shown in Tables 1 to 4.

  As is clear from Tables 1 to 4, in each example in which the basis weight, winding length, and pitch ratio H of the toilet roll are in a predetermined range, the winding length per roll is increased without reducing the basis weight. The quality difference of the entire roll could be reduced.

In addition, in the case of Example 14 in which the DMDT of toilet paper 1 ply that does not include a perforation is less than 2.3 N / 25 mm and the DMDT of the perforation is less than 4.6 N / 114 mm, it is more difficult to break compared to the other examples. Although inferior and a little unintentional perforation occurred, there is no practical problem.
In Examples 19 and 20 in which DMDT of toilet paper 1 ply without perforation exceeds 8.0 N / 25 mm, the softness and flexibility are inferior to those of other examples, but there is no practical problem. In the case of Example 20, the perforated DMDT exceeded 18.3 N / 114 mm, and it was slightly difficult to cut at the perforated line.
In the case of Example 21 in which the average pitches P1 and P2 are less than 70 mm, a slight perforation of the perforation occurs slightly compared to the other examples, but there is no practical problem.
In the case of Example 26 in which the average pitches P1 and P2 exceeded 500 mm, the sheet size was larger than in the other examples, which was inconvenient when cutting toilet paper, but there is no practical problem.

On the other hand, in the case of Comparative Example 1 in which the winding length was less than 150 m, the roll replacement frequency increased.
In the case of Comparative Example 2 in which the winding length exceeded 260 m, the roll mass became large and it was difficult to rotate in the toilet paper holder.

In the case of Comparative Example 3 in which the pitch ratio H is less than 1.002, the quality difference between the outer winding and the inner winding is large (the outer winding is too good).
In Comparative Example 4 in which the pitch ratio H exceeded 1.017, the quality difference between the outer winding and the inner winding became large (the quality of the outer winding was inferior).

In the case of Comparative Example 5 in which the basis weight per 1 ply of toilet paper was less than 12 g / m ² , the frequency of roll replacement increased.
In the case of Comparative Example 6 in which the basis weight per 1 ply of toilet paper exceeded 21 g / m ² , the roll mass increased and it became difficult to rotate in the toilet paper holder.

2 Embossed
10 toilet roll 10m perforation 10x toilet paper 10x1 outermost toilet paper 10e1 outermost toilet paper edge 10x2 innermost toilet paper 10e2 innermost toilet paper edge S1 first area S2 second Region C1 1st continuous part C2 2nd continuous part

Claims (8)

A toilet roll in which one surface is a convex portion and a corresponding opposite surface is a plurality of concave and convex portions, and a 1-ply toilet paper having a perforation along the width direction is wound into a roll shape,
The basis weight per 1 ply of the toilet paper is 12 to 21 g / m ² , the winding length is 150 to 260 m, (the average pitch P1 (mm) of the perforation of the outermost wound toilet paper wound around the toilet roll) / (The toilet roll whose pitch ratio H represented by the average pitch P2 (mm) of the perforation of the innermost volume of the toilet roll is 1.002 to 1.017).
However, the average pitch P1 is two first continuous portions having a length of 1000 mm or more and both ends being the perforations in the first region of 1 to 5 m from the edge of the outermost toilet paper. Average pitch when taken out above; The average pitch P2 is a second continuous region having a length of 1000 mm or more in the second region of 30 m to 40 m from the edge of the innermost toilet paper, and both ends being the perforations. Average pitch when 5 or more parts are taken out separately Using a tissue softness measuring device TSA, a sheet-like sample with the outer surface of the toilet roll placed on the sample table facing up is pushed from above with a pushing pressure of 100 mN and 600 mN without rotating the bladed rotor. When
The value of rigidity represented by the amount of deformation in the vertical direction of the sheet-like sample between indentation pressures of 100 mN and 600 mN is defined as D value,
The toilet roll according to claim 1, wherein a D value of the sheet-like sample of the first continuous portion is 1.5 to 3.6 mm / N.   The toilet roll according to claim 1 or 2, wherein the average pitches P1 and P2 are 70 to 500 mm.   The toilet roll according to any one of claims 1 to 3, wherein a tensile strength DMDT based on JIS P8113 of the toilet paper 1 ply not including the perforation is 2.3 to 8.0 N / 25 mm.   The toilet roll according to any one of claims 1 to 4, wherein a tensile strength DCDT based on JIS P8113 of the toilet paper 1 ply not including the perforation is 0.6 to 4.0 N / 25 mm.   The toilet roll according to any one of claims 1 to 5, wherein a tensile strength DMDT based on JIS P8113 of the perforation of the toilet paper 1 ply is 4.6 to 18.3 N / 114 mm. The toilet winding density of troll according to any one of claims 1 to 6 is 1.2~2.1m / cm ² toilet rolls. The toilet roll according to any one of claims 1 to 7, wherein a roll density of the toilet roll is 0.23 to 0.37 g / cm ³ .