JP6781178B2 - Manufacturing method of sanitary tissue paper roll - Google Patents

Description

The present invention relates to a method for producing a roll-shaped sanitary tissue paper roll such as a toilet tissue.

Toilet paper is commercially available, which is mainly packaged in units of 4 rolls or 12 rolls. 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.
For these reasons, a roll product with a longer winding length was developed by reducing the basis weight per sheet of sanitary tissue paper that composes the roll product to less than 13 g / m ² and further reducing the paper thickness to less than 60 μm. (Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-87703

However, if the basis weight of the paper constituting the roll product is reduced, the strength is lowered and the usability and bulkiness are lowered. On the other hand, since the bulk of the paper is increased to compensate for these problems, if the calendar processing is weakened, there is a problem that the softness and smoothness are inferior, and the roll diameter becomes large, making it difficult to fit in the toilet paper holder. Further, if the embossing treatment is strengthened, there are problems that the paper thickness becomes too high and the difference in usability between the front and back sides of the paper becomes large. Further, if the calendar processing is strengthened and the paper thickness is reduced without lowering the basis weight, the roll diameter can be reduced, but there is a problem that the roll diameter is not soft and the quality is inferior.
Therefore, an object of the present invention is to provide a method for producing a hygienic tissue paper roll , which is excellent in texture and usability without reducing the basis weight, lengthens the winding length per roll, and is excellent in space saving during carrying and storage. To do.

In order to solve the above problems, the method for producing a sanitary tissue paper roll is a method for producing a sanitary tissue paper roll in which one sheet of sanitary tissue paper having embossed perforations is wound into a roll, and the sanitary tissue paper roll is produced. The basis weight per sheet is 16.5 to 21.5 g / m ² , the paper thickness is 0.6 to 1.1 mm / 10 sheets, the roll length of the sanitary tissue paper roll is 120 to 185 m, and the roll diameter is The base paper is 100 to 132 mm, the base paper is calendar-processed, the paper thickness after the calendar processing is 0.60 mm to 1.10 mm / 10 sheets, and the difference ΔC of the paper thickness before and after the calendar processing is 0.10 to 0 to 10. It is 0.40 mm / 10 sheets.

With the tissue softness measuring device TSA, the bladed rotor was pushed in from above as a pushing pressure of 100 mN against the sample with the outer surface of the roll of the sanitary tissue paper placed on the sample table facing up, and then the rotation speed was 2.0 (/ sec). When the vibration of the sample table was measured by the vibration sensor, the intensity (TS750) of the maximum peak of the first spectrum from the low frequency side, which was automatically acquired by the software on TSA, was 12 to 30 dBV ^2. When the intensity (TS7) of the maximum peak of the spectrum including 6500 Hz is 14 to 26 dBV ² rms and the value of TS750 is 1, the sample table with the back surface inside the roll of the sanitary tissue paper facing up. The value of TS750 when installed in is preferably 1.06 to 2.30.

When the sample with the outer surface of the roll of the sanitary tissue paper placed on the sample table turned up by the TSA was pushed from above with pushing pressures of 100 mN and 600 mN without rotating the rotor with blades, respectively. It is preferable that the measured value of the rigidity (D), which is represented by the amount of vertical deformation displacement of the sample between the indentation pressures of 100 mN and 600 mN, is 2.4 to 3.5 mm / N.

According to the present invention, it is possible to obtain a hygienic tissue paper roll which is excellent in texture and usability without lowering the basis weight, lengthens the winding length per roll, and is excellent in space saving during carrying and storage.

It is a perspective view which shows the appearance of the sanitary tissue paper roll which concerns on embodiment of this invention. It is a figure which shows the measurement principle of the tissue softness measuring apparatus TSA. It is a figure which shows an example of the analysis result of the vibration frequency of a paper sample by TSA. It is a figure which shows the measuring method of the rigidity D of a paper sample sample by TSA. It is a figure which shows an example of a machine winder. It is a figure which shows an example of the roll winding processing machine.

Preferred embodiments of the present invention will be described below, but these are listed for exemplification purposes and do not limit the present invention.
As shown in FIG. 1, the sanitary tissue paper roll 10 according to the embodiment of the present invention is formed by winding one sanitary tissue paper 10x into a roll shape, and the basis weight per sheet of the sanitary tissue paper is 16.5 to 21. .5g / ^{m 2,} and the sheet thickness is 0.6~1.1mm / 10 sheets, winding length of the roll (winding length) 120～185M winding diameter DR is 100～132Mm. The winding length is preferably 145 to 185 m. The winding diameter DR is preferably 100 to 125 mm.
The method of adjusting the basis weight and thickness of sanitary tissue paper per sheet within the above range will be described in detail later, but the calendar conditions of the base paper web of sanitary tissue paper (paper thickness and specific volume after calendar processing, before and after calendar processing). (Paper thickness difference) and embossing conditions (paper thickness and specific volume after embossing, paper thickness difference before and after embossing) are specified.

If the basis weight per sheet of sanitary tissue paper is less than 16.5 g / m ² or the paper thickness is less than 0.6 mm / 10 sheets, the strength is reduced and the usability (bulkness) is also reduced. .. When the basis weight per sheet of sanitary tissue paper exceeds 21.5 g / m ² or the paper thickness exceeds 1.1 mm / 10 sheets, the laminate becomes thicker, and the winding diameter of the roll in which this is wound 120 m or more. Exceeds 132 mm, making it difficult to fit in the toilet paper holder, and the difference in usability between the front and back of the paper becomes large.
If the winding length of the roll is less than 120 m, the winding length per roll becomes short, and space saving during storage cannot be achieved. If the roll length exceeds 185 m, the roll diameter DR (outer diameter of the roll) exceeds 132 mm, making it difficult to fit in a toilet paper holder or the like.
The basis weight per sheet of sanitary tissue paper is preferably 17.5 to 20.5 g / m ² , and the paper thickness is preferably 0.60 to 0.80 mm / 10 sheets.

Using the Tissue Softness Analyzer (TSA), a rotor with a blade is pushed in from above as a pushing pressure of 100 mN against a sample with the outer surface 10a of the roll of one sanitary thin leaf paper 10x installed on the sample table facing up. After that, when the sample table was rotated at a rotation speed of 2.0 (/ sec) and the vibration of the sample table was measured by the vibration sensor, the intensity of the maximum peak of the first spectrum from the low frequency side automatically acquired by the software on the TSA. (TS750) is preferably 12-30 dBV ² rms, more preferably 12-25 dBV ² rms, and the intensity of the maximum peak of the spectrum including 6500 Hz (TS7) is preferably 14-26 dBV ² rms, more preferably 14-23 dBV. It is ² rms. Further, when the value of the above TS750 with the front side of the sanitary tissue paper facing up (this is referred to as "TS750t") is 1, when the sanitary tissue paper 10x is installed on the sample table with the back surface 10b inside the roll facing up. The ratio R (TS750b / TS750t) represented by the value of TS750 (this is referred to as “TS750b”) is preferably 1.06 to 2.30, more preferably 1.06 to 1.70.
For samples with the surface of sanitary tissue paper facing up, if the value of TS7 is higher than the above range, sufficient softness cannot be obtained, and if it is lower than the above range, only the softness stands out and a good tactile sensation cannot be obtained. In some cases. If the value of TS750 (TS750t) is higher than the above range, the smoothness is inferior, and if it is lower than the above range, even if it is smooth, the embossing treatment is not sufficient and the specific volume may be small.

The sanitary tissue paper is embossed, and the TS750t on the front surface on the outside of the roll is lower than the TS750b on the back surface on the inside of the roll. This is because the embossing on the front surface is concave and the embossing on the back surface is convex, so that the back surface feels rougher and the value of TS750 becomes higher.
The ratio R represents the difference in tactile sensation between the front and back surfaces of the sanitary tissue paper, and when the ratio R exceeds 2.30, the difference in tactile sensation between the front and back surfaces (the difference between the front and back surfaces of smoothness) becomes too large. On the other hand, when the ratio R is less than 1.06, the embossing depth becomes shallow, the embossing becomes weak, and the embossing looks bad.

Rigidity (D) is determined by TSA when the sample installed on the sample table is pushed from above with pushing pressures of 100mN and 600mN without rotating the rotor with blades, respectively, between the pushing pressures of 100mN and 600mN. It is represented by the amount of deformation and displacement of the sample in the vertical direction.
D is preferably 2.4 to 3.5 mm / N, more preferably 2.7 to 3.5 mm / N.
If D is lower than the lower limit of the above range, it is inferior in suppleness, and if it is higher than the upper limit of the above range, the suppleness is too conspicuous, while DMDT is low and easily torn, and the smoothness is inferior, and the balance of overall quality is achieved. Lacking.

Here, as shown in FIG. 2, the tissue softness measuring device TSA210 analyzes vibration data detected by various sensors when the rotating bladed rotor 204 is pressed from above the paper sample (sample) 206. The softness (feel) of paper is quantitatively evaluated by parameterizing (TS value), and the product name is manufactured by Emtec Electronic GmbH of Germany (Japan agency is Nihon Rufuto Co., Ltd.). Is.
For specific measurement using TSA, (i) Sample 206 (sample processed into a circle with a diameter of about 112.8 mm using an emtec sample punch) was installed so as to cover the circular sample table 205 from the outside. , The outer circumference of the sample 206 is held by the sample fixing ring 208, and (ii) the rotor 204 with a blade is pushed from above the sample 206 with a pushing pressure of 100 mN, and then the rotor 204 is rotated at a rotation speed of 2.0 (/ sec). (iii) The vibration of the sample table 205 is measured by the vibration sensor 203 installed inside the sample table 205, and the vibration frequency is analyzed. (iv) Next, the amount of deformation displacement (mm / N, rigidity D) in the vertical direction when the sample 206 is deformed without rotating the rotor 204 at pushing pressures of 100 mN and 600 mN is measured. By the steps (i) to (iv), the elements (smoothness, suppleness, volume feeling) of the overall hand feel value of the product can be quantified. The measurement is performed 5 times for one sample and averaged.

The sample table 205 is installed on the base plate 201, and the force sensor 202 is arranged between the sample table 205 and the base plate 201. Then, the pushing pressure of the bladed rotor 204 is controlled by the detected value of the force sensor 202. Further, the rotor 204 with a blade is rotated by a motor 209.
The emtec measurement system is used as software for vibration analysis and parameterization (TS value). This software is equipped with various algorithms (for example, Base Tissue, Facial, TP, etc.), and automatically acquires TS7, TS750, D (rigidity) 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 number of layers, and the like. In the present invention, only TS7, TS750, and D are specified instead of the HF value, and any algorithm may be used as long as the above measurement conditions are satisfied, and the values of TS7, TS750, and D depend on the type of algorithm. It doesn't change.

FIG. 3 shows an example of the analysis result of the vibration frequency of the paper sample by TSA. Let TS750 be the intensity of the maximum peak A of the first spectrum from the low frequency side, and TS7 be the intensity of the maximum peak B of the spectrum including 6500 Hz (around 6500 Hz). The maximum peak B is usually located at about 6500 Hz.
FIG. 4 shows a method of measuring the rigidity D of a paper sample sample by TSA.
The vibration frequency of the paper sample sample depends on the structure of the paper and the rotation speed of the rotor 4, and the amplitude (intensity of the spectrum) depends on the height of the structure of the paper such as the height of the crepe. Then, TS750, which is the first peak of the spectrum (A in FIG. 3), represents smoothness and roughness. On the other hand, the frequency at which TS7 appears (range of 5000 to 8000 Hz, usually around 6500 Hz) is the resonance frequency of the rotor 4, and when it travels on the paper surface as a horizontal vibration, it is momentarily cut off by the paper fiber and the rotor 4 Due to vibration. The rigidity D correlates with the rigidity (tensile strength) of the paper.
The lower the value of TS7, the better the softness (surface softness and bulk softness), and the lower the value of TS750, the better the smoothness. Further, the larger the value of D, the better the suppleness. By defining TS750, D and TS7, it is possible to quantitatively evaluate the softness (fluffiness and smoothness) of sanitary tissue paper, which was conventionally borne by the evaluator's subjectivity.

The specific volume of the sanitary tissue paper is preferably 3.0 to 5.5 cm ³ / g.
If the specific volume is less than 3.0 cm ³ / g, the softness may be poor or the bulk (bulkness) may be lowered, resulting in inferior water absorption capacity. On the other hand, when the specific volume exceeds 5.5 cm ³ / g, the bulk (bulkness) becomes high, but the smoothness may be inferior, the difference between the front and back sides of the smoothness may become large, and the tactile sensation may be deteriorated. The specific volume is preferably 3.5 to 5.0 cm ³ / g.

When the tensile strength in the vertical direction during drying is DMDT (Dry Machine Direction Tensile strength) and the tensile strength in the horizontal direction during drying is DCDT (Dry Cross Direction Tensile strength) based on JIS P8113 of one piece of sanitary tissue paper. , DMDT is preferably 2.2-4.8N / 25mm, more preferably 2.7-3.8N / 25mm, DCDT is preferably 0.80-2.2N / 25mm, more preferably 1.0-1. It is .5N / 25mm.
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, they become hard and the softness may be impaired.
The flow direction of the sanitary tissue paper papermaking is defined as the "vertical direction", and the direction perpendicular to the flow direction is defined as the "horizontal direction".

The water absorption degree (dropping amount is 0.01 ml) based on the old JIS S3104 of one sanitary tissue paper is preferably 3.5 seconds or less, more preferably 3.0 seconds or less. The faster the water absorption is, the better, but if it exceeds the above range, the water absorption may be inferior.
The ease of loosening of one sanitary tissue paper based on JIS-P4501 is preferably 60 seconds or less, more preferably 50 seconds or less. The ease of unraveling should be as fast as possible, but if it exceeds the above range, the water solubility in the toilet may be inferior.

The sanitary tissue paper may be made of 100% by mass of wood pulp, and may contain used paper pulp and non-wood pulp. In order to obtain the target quality, it is preferable to use wood pulp of NBKP (coniferous kraft pulp): LBKP (hardwood kraft pulp) = 0: 100 to 70:30 (mass ratio) as a raw material, and a more preferable range is NBKP: LBKP = 0: 100 to 50:50, and a more preferable range is NBKP: LBKP = 0: 100 to 30:70.
Pulp produced from the genus Eucalyptus in the family Myrtaceae, represented by the genus Grandis of the genus Eucalyptus and the eucalyptus globulus, is preferable as the grade of the LBKP. Alternatively, the waste paper pulp derived from a milk carton or the like can be contained up to about 60% by mass with respect to the wood pulp having the above pulp ratio. The quality of used paper pulp varies widely, and increasing the blending ratio greatly affects the quality of the product, especially the softness. Therefore, it is desirable to blend 50% by mass or less, preferably 40% by mass or less of the wood pulp.
In addition, in order to ensure the appropriate strength of the sanitary tissue paper, the raw materials can be blended by ordinary means, and the strength can be adjusted by beating the pulp fibers. As a beating to obtain the target quality, the Canadian standard filtrate measured by JIS-P8121 is 0 to 150 ml, more preferably 0 to 100 ml, still more preferably 10 to 50 ml, based on commercially available virgin pulp. Reduce water content. Moreover, it is preferable not to use a wet paper strength enhancer.

When a virgin raw material is used as a paper material, sanitary tissue paper can be made by blending coniferous kraft pulp and hardwood kraft pulp having a certain range of fiber length and fiber roughness in a specific range. Additives to paper materials include softeners including debonder softeners, bulking agents, dyes, dispersants, dry paper strength enhancers, drainage improvers, pitch control agents, and absorbency, depending on the required quality of the final product. An improver, a wetting agent, etc. can be used.
When the used paper raw material is used as the sanitary thin paper, the same treatment as in the case of the above virgin type is performed.
Details of the method for producing sanitary tissue paper will be described later.

Sanitary tissue paper can be produced in the order of (1) papermaking and creping, (2) calendar processing with a machine winder, (3) embossing and roll winding, for example, as follows.

(1) Papermaking and creping,
First, the web is made from the above-mentioned paper material on the wire part of a known paper machine and moved to the felt of the press part. Examples of the wire part method include a round net type, a long net (Ford linear) type, a suction breast type, a short net type, a twin wire type, and a crescent former.
Then, the web is mechanically compressed with a suction pressure roll, a pressure roll without suction, a press roll, or the like, or dehydration is continued by a dehydration method such as aeration drying with hot air. Suction pressure rolls or non-suction pressure rolls are also used as a means of moving the web from the press part to the Yankee dryer.

The web transferred to the Yankee dryer is dried by the Yankee dryer and the Yankee dryer hood, then creped by a creping doctor, and wound up by a reel part.
Creping (creating wrinkles called crepes) is the mechanical compression of paper in the vertical direction (the sheet running direction on a paper machine). Then, when manufacturing the web of sanitary tissue paper, the web on the Yankee dryer is peeled off by the creping doctor and wound up on the reel part, but the speed difference between the Yankee dryer and the reel part (speed of the reel part ≤ speed of the Yankee dryer). ), A crepe (wrinkle) is formed by the creping doctor.
The quality required for sanitary tissue paper, that is, bulk (bulk feeling), softness, water absorption, surface smoothness, aesthetics (crepe shape), etc., depends on the above speed difference. Although it depends on the above conditions such as speed difference, the basis weight of the web on the reel after creping is approximately 18 to 23 g / m ² , which is heavier than the basis weight of the web on the Yankee dryer before creping. The basis weight is preferably 19 to 22 g / m ² . If it exceeds the above range, the strength may increase and the paper may become stiff, and if it exceeds the above range, the strength may be weak and the paper may be easily torn.

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 x (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 ratio in producing sanitary tissue paper is preferably 10 to 50%, more preferably 15 to 40%, and most preferably 20 to 35%.

(2) Calendar processing by machine winder FIG. 5 shows an example of machine winder 100. As described above, the reel 2 wound up by the reel part after crepe is set in the machine winder 100 to become the original roll 4. At this time, the calendar processing is performed in two stages in the order of the calendar machine 101 of the first stack and the calendar machine 102 of the second stack.
The thickness of the sanitary tissue paper on the original roll 4 after the calendar processing is preferably 0.60 to 1.10 mm / 10 sheets, more preferably 0.60 to 0.85 mm / 10 sheets. The specific volume of the sanitary tissue paper in the raw roll 4 after the calendar treatment is preferably 3.0 to 4.8 cm3 / g, more preferably 3.0 to 4.5 cm3 / g. Further, the difference ΔC (paper thickness before calendering-paper thickness after calendering) of sanitary tissue paper before and after calendering is preferably 0.10 to 0.40 mm / 10 sheets, more preferably 0.15-. 0.35 mm / 10 sheets.
If ΔC exceeds the above range, the softness may be inferior, and if it is less than the above range, the softness and smoothness may be inferior.

Each of the calendar machines 101 and 102 is preferably composed of two metal rolls, but one of the two rolls may be an elastic roll so that soft calendar processing can be performed.
The linear pressure of the calendar is preferably 3.5 to 8.5 kg / cm, more preferably 4.5 to 8.0 kg / cm. If the linear pressure exceeds the above range, the bulk becomes small and the softness may be inferior. Further, when the wire thickness is less than the above range, the bulk becomes large and the winding diameter DR of the roll becomes large. Further, the linear pressure is preferably higher in the second stack than in the first stack.
The draw can be adjusted as appropriate during calendar processing. The draw between the reel 2 and the original fabric 4 after the calendar processing is preferably 100 to 110%.
By calendar processing and draw adjustment, the paper thickness can be controlled to 0.6 mm to 1.1 mm / 10 sheets while maintaining the basis weight at 16.5 to 21.5 g / m ² .

It is preferable that the basis weight of the web of the original fabric 4 after the calendering process and before the embossing process is 17.5 to 22.0 g / m ² per sheet. In the roll winding process described later, the web is slightly stretched and the basis weight is also low. Therefore, it is preferable and more preferably 17.5 to 22.0 g / m ² , which is slightly higher than the target basis weight of the sanitary tissue paper roll 10 in the final form. It shall be 18.5 to 21.0 g / m ² .

(3) Embossing and roll winding process FIG. 6 shows an example of the roll winding processing machine 150. The original fabric 4 is set in the roll winding processing machine 150, embossed by the embossing unit (embossing roll) 151, and then wound on a wide sanitary thin paper original roll 10W having a winding diameter of 100 to 132 mm by the winding mechanism 153. Be done. After that, the original roll 10W is cut into a predetermined width (114 mm or the like) to obtain a sanitary tissue paper roll 10.
The roll winding processing machine 150 is roughly classified into two types, a surface type and a center type. The surface method is a method in which the roll to be wound is supported from the outside by another plurality of drive rolls, and the wound sanitary tissue paper roll 10 is easy to control the winding diameter and has a higher production speed. .. The center method is a method of winding by driving a shaft passed through the center of the winding roll, and the wound sanitary tissue paper roll 10 is a relatively soft product and is suitable for a delicately embossed product. In the present invention, any method can be used for winding, but the surface method is preferable.
The machine winder 100 may be incorporated into the roll winding processing machine 150, and the calendar processing and the embossing processing may be performed in this order by the roll winding processing machine.

By embossing in the roll winding processing machine 150, even if the basis weight per sheet of sanitary tissue paper is in the range of 16.5 to 21.5 g / m ² , the bulk is increased, the softness is soft, and the loosening is easy. Can be improved.
The difference in paper thickness of sanitary tissue paper before and after embossing ΔE (paper thickness before embossing-paper thickness after embossing) is preferably −0.2 to 0.15 mm / 10 sheets, more preferably −0.1 to 0. 0.10 mm / 10 sheets. If ΔE exceeds the above range, the embossing treatment may not be sufficient and the softness may be inferior. If ΔE is less than the above range, the embossing treatment may be too strong and the difference between the front and back sides of the smoothness may become large. Here, "before embossing" has the same meaning as after calendar processing.
When the embossing treatment is performed, the paper thickness after the embossing treatment becomes higher than that before the embossing treatment, and ΔE becomes negative. However, in the roll processing machine, since the paper is wound while being pulled, the paper is stretched and the paper thickness is reduced. Therefore, in the roll processing machine, it is preferable to wind the paper so that ΔE is −0.20 to 0.15 mm / 10 sheets while considering the effects of embossing and elongation of the paper.
The strength of embossing can be controlled by appropriately adjusting the nip widths of the embossing roll and the rubber roll. The nip width varies depending on the characteristics of the roll, but is preferably 20 to 40 mm, more preferably 25 to 35 mm. If the nip width exceeds 40 mm, the embossing becomes too strong and the difference between the front and back sides becomes large, or the paper thickness becomes large and the roll diameter DR becomes large. On the other hand, if the nip width is 20 mm or less, the embossing may be weakened and the appearance may be deteriorated, or the specific volume may be reduced. The nip width can be measured using carbon paper. As a measurement method, first, the nip of the embossed roll is released, and carbon paper and general copy paper are stacked and set. Next, nip the embossed roll. After that, let the nip escape and remove the carbon paper and copy paper. Since the color of the carbon paper on the part where the nip was applied by the emboss roll is transferred to the copy paper, the nip width can be measured.

The roll winding machine can simultaneously perform printing, embossing, perforation processing, tail sealing, and cutting with a predetermined width (114 mm, etc.), and can manufacture a sanitary thin paper roll 10. Further, after that, the film packaging process can be performed to produce a sanitary tissue paper roll package.

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

The pulp composition (mass%) was NBKP 10% and LBKP 90%, and 35% of used paper raw material derived from milk carton was mixed with this raw material, and the sanitary tissue paper and its roll shown in Table 1 were used by the apparatus shown in FIGS. Manufactured.

The following evaluations were made.
Longitudinal tensile strength during drying DMDT and lateral tensile strength during drying DCDT: Based on JIS P8113, the maximum load until breakage was measured in units of N / 25 mm for one piece of sanitary tissue paper.
Basis weight: Measured based on JIS P8124 and converted per sheet of sanitary tissue paper.
Paper thickness: Measured using a thickness gauge (dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho). The measurement conditions were a measuring load of 3.7 kPa, a stylus diameter of 30 mm, a sample was placed between the stylus and the measuring table, and a gauge was read when the stylus was lowered at a speed of 1 mm or less per second. For the web before the calendar processing, 10 sheets of sanitary tissue paper were stacked and measured, and for the web after the calendar processing and for the roll, 10 sheets of sanitary tissue paper were stacked. Moreover, the measurement was repeated 10 times and the measurement result was averaged. Then, the obtained average value per sheet was divided by the number of sheets to obtain the paper thickness per sheet of sanitary tissue paper.
Specific volume: The thickness per sheet of sanitary tissue paper was divided by the basis weight per sheet and expressed as the volume cm ³ per unit g.
Water absorption: According to the old JIS-S3104 method, 0.01 ml of purified water is dropped at a temperature of 23 ± 1 ° C and a humidity of 50 ± 2%, and the time (seconds) for the water drops to be absorbed by one piece of sanitary tissue paper is calculated. It was measured.
Ease of unraveling: The ease of unraveling of one piece of sanitary tissue paper was measured according to JIS P4501.
Roll diameter DR: Measured using a diamond meter rule manufactured by Muratec KDS Co., Ltd. For the measurement, 10 rolls were measured and the measurement results were averaged.

The DTS7 and TS750 were measured using the tissue softness measuring device TSA. The measurement conditions are also as described above.
The sensory evaluation was performed by 20 monitors. The evaluation standard was a maximum of 5 points. It is good if the evaluation standard is 3 points or more. The "appearance of embossing" is an evaluation of whether or not the shape of the embossing can be visually recognized by visual inspection of the monitor.
The basis weight, tensile strength, thickness, specific volume, and measurement by the tissue softness measuring device TSA are balanced under the temperature and humidity conditions (23 ± 1 ° C, 50 ± 2% RH) specified in JIS-P8111. Performed after holding in state.

The obtained results are shown in Tables 1 and 2.

As is clear from Tables 1 and 2, the basis weight per sheet of sanitary tissue paper is 16.5 to 21.5 g / m ² , and the paper thickness is 0.60 to 1.1 mm / 10 sheets or less. In the case of the embodiment, the roll length of the sanitary tissue paper roll is in the range of 120 to 185 m and the roll diameter is in the range of 100 to 132 mm, and the texture and usability are excellent without reducing the basis weight, and the roll length per roll can be lengthened. did it.

On the other hand, in the case of Comparative Example 1 in which the paper thickness was less than 0.6 mm / 10 sheets, the softness was inferior. It is considered that this is because the linear pressure of the calendar exceeds 8.5 kg / cm, the paper thickness difference ΔC before and after the calendar processing exceeds 0.40 mm / 10 sheets, and the specific volume becomes less than 3.0 cm ³ / g. Be done. Further, in the case of Comparative Example 1, since the paper thickness difference ΔE before and after the embossing treatment was 0.18 mm / 10 sheets or more, the embossing treatment was weakened.
In Comparative Examples 2 to 4 in which the basis weight per sheet of sanitary tissue paper was less than 16.5 g / m ² , the tear resistance was inferior.
In the case of Comparative Examples 5 and 6 in which the basis weight per sheet of sanitary tissue paper exceeded 21.5 g / m ² , the winding diameter of the roll exceeded 132 mm, making it difficult to attach to the paper holder. In Comparative Example 5, the paper thickness difference ΔE before and after the embossing treatment exceeded 0.15 mm / 10 sheets, and the embossing treatment was weak, so that the softness was inferior. Further, in Comparative Example 6, the paper thickness difference ΔC before and after the calendar processing exceeded 0.40 mm / 10 sheets, and the softness was inferior because the calendar processing was too strong.

In the case of Comparative Examples 1, 2, 4 and 5 in which R (TS750b / TS750t) was less than 1.06, the embossing appearance was inferior (Comparative Example 2) and the specific volume was small (Comparative Example 1). 4), the softness was inferior (Comparative Example 5). On the other hand, in the case of Comparative Example 6 in which R exceeded 2.30, the difference between the front and back sides of smoothness became large.
In the case of Comparative Example 4 in which TS750t was less than 12 dBV ² rms, it was smooth, but the embossing treatment was not sufficient, and the specific volume was reduced to less than 3.0 cm ³ / g. In Comparative Examples 3, 5 and 6 in which TS750t exceeded 30 dBV ² rms, the smoothness was inferior.
In the case of Comparative Example 3 in which TS7 was less than 14 dBV ² rms, only the softness was outstanding, the smoothness was inferior, and a good tactile sensation could not be obtained.
In Comparative Examples 1, 5 and 6 in which TS7 exceeded 26 dBV ² rms, the softness was inferior.
In the case of Comparative Example 3 in which D exceeded 3.5 mm / N, the suppleness was too conspicuous, while the DMDT was low and easily torn, and the smoothness was inferior, resulting in an imbalance in overall quality.
In the case of Comparative Example 5 in which D was less than 2.4 mm / N, the suppleness was inferior.

10 Sanitary tissue paper roll 202 Force sensor 204 Blade rotor 205 Sample stand 206 Sample 210 Tissue softness measuring device TSA

Claims (3)

A method for manufacturing a sanitary tissue paper roll in which one sheet of sanitary tissue paper having embossed perforations is wound into a roll, and the basis weight per sheet of the sanitary tissue paper is 16.5 to 21.5 g /. m ² , and the paper thickness is 0.6 to 1.1 mm / 10 sheets.
The sanitary tissue paper roll has a roll length of 120 to 185 m and a roll diameter of 100 to 132 mm.
The base paper is calendered, and the paper thickness after the calendering is 0.60 mm to 1.10 mm / 10 sheets, and the difference ΔC between the paper thicknesses before and after the calendering process is 0.10 to 0.40 mm / 10 sheets. A method for manufacturing sanitary tissue paper rolls. The rotation speed is 2.0 (/ sec) after the rotor with blade is pushed in from above as a pushing pressure of 100 mN for the sample with the outer surface of the roll of the sanitary tissue paper placed on the sample table facing up by the tissue softness measuring device TSA. When the vibration of the sample table is measured by the vibration sensor,
The intensity of the maximum peak of the first spectrum from the low frequency side (TS750) automatically acquired by the software on the TSA is 12 to 30 dBV ² rms, and the intensity of the maximum peak of the spectrum including 6500 Hz (TS7) is 14-26 dBV ² rms,
The sanitary tissue paper according to claim 1, wherein when the value of TS750 is 1, the value of TS750 when the sanitary tissue paper is placed on the sample table with the back side inside the roll facing up is 1.06 to 2.30. How to make rolls. When the sample with the outer surface of the roll of the sanitary tissue paper placed on the sample table faced up by the TSA was pushed from above with pushing pressures of 100 mN and 600 mN without rotating the rotor with a blade.
The sanitary tissue paper according to claim 2, wherein the measured value of the rigidity (D) is 2.4 to 3.5 mm / N, which is represented by the amount of deformation displacement of the sample in the vertical direction between the indentation pressures of 100 mN and 600 mN, respectively. Roll manufacturing method .