JP6735297B2 - Sanitary tissue paper roll manufacturing method - Google Patents

Description

This invention relates to a manufacturing method of the sanitary thin paper roll a roll of such toilet Tissue.

The 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. In addition, storage space is limited at home, workplace, public facilities, etc.
Therefore, by reducing the basis weight of hygienic thin paper constituting a roll product to less than 13 g/m ² and further reducing the paper thickness to less than 60 μm, a roll product with a longer roll length was developed. (Patent Document 1).

JP, 2006-87703, A

However, if the basis weight of the paper constituting the roll product is lowered, the strength is lowered and the usability and bulkiness are lowered. On the other hand, if the calendering process is weakened in order to increase the bulk of the paper in order to compensate for these problems, there is a problem in that the softness and smoothness are inferior, and the roll diameter becomes large, making it difficult to fit in the toilet paper holder. Further, when the embossing treatment is strengthened, there are problems that the paper thickness becomes too high and the difference in the feeling of use between the front and back of the paper becomes large. Further, if the calendering process is strengthened and the paper thickness is reduced without reducing the basis weight, the roll diameter can be reduced, but there is a problem that the quality is poor because the roll is not soft.
Accordingly, the present invention is to increase the winding length per roll is excellent in texture and feel without reducing the basis weight, and aims to provide a manufacturing method excellent sanitary thin paper roll in space-saving at the time of carrying or storing To do.

The method for producing a sanitary thin paper roll of the present invention is a method for producing a sanitary thin paper roll in which a single sheet of sanitary thin paper having perforations is wound into a roll, and the basis weight of the sanitary thin paper roll is 16. 5 to 21.5 g/m ² , and a paper thickness of 0.6 to 1.1 mm/10 sheets, and the sanitary thin paper roll has a winding length of 120 to 185 m, a winding diameter of 100 to 132 mm, and a tissue softness measuring device TSA. With respect to the sample with the outer surface of the roll of the sanitary thin paper installed on the sample table facing up, when pushed from above with the pushing pressure of 100 mN and 600 mN without rotating the rotor with blades, the pushing pressures respectively The measured value of the rigidity (D), which is represented by the amount of vertical deformation of the sample between 100 mN and 600 mN, is 2.4 to 3.5 mm/N, and the paper thickness before and after embossing the base paper. ΔE (paper thickness before embossing-paper thickness after embossing) is -0.20 to 0.15 mm/10 sheets, and the base paper is calendered before the embossing, and after the calendering Is 0.60 mm to 1.10 mm/10 sheets, and the difference ΔC in paper thickness before and after the calendering is 0.10 to 0.40 mm/10 sheets .

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

It is a perspective view showing appearance of a sanitary thin paper roll concerning an embodiment of the present invention. It is a figure which shows the measurement principle of the tissue softness measuring device TSA. It is a figure which shows an example of the analysis result of the vibration frequency of the paper sample sample by TSA. It is a figure which shows the measuring method of the rigidity D of the 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 a roll winding processing machine.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described, but these are provided for the purpose of illustration and do not limit the present invention.
As shown in FIG. 1, the sanitary thin paper roll 10 according to the embodiment of the present invention is obtained by winding one sanitary thin paper 10x into a roll shape, and the basis weight of each sanitary thin 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.
A method for adjusting the basis weight and the paper thickness of the sanitary thin paper within the above range will be described in detail later, but the calender conditions of the base paper web of the sanitary thin paper (paper thickness and specific volume after calendering, before and after calendering) Thickness difference) and embossing conditions (paper thickness and specific volume after embossing, difference in paper thickness before and after embossing).

When the basis weight per sheet of sanitary thin 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 thin paper exceeds 21.5 g/m ² or the paper thickness exceeds 1.1 mm/10 sheets, the laminated body becomes thicker, and the roll diameter of 120 m or more is rolled. Is more than 132 mm, it becomes difficult to fit in the toilet paper holder, and the difference in the feeling of use between the front and back of the paper becomes large.
If the roll length is less than 120 m, the roll length per roll becomes short, and space saving during storage cannot be achieved. When the roll length of the roll exceeds 185 m, the roll diameter DR (outer diameter of the roll) exceeds 132 mm, which makes it difficult to fit in a toilet paper holder or the like.
The basis weight of the sanitary thin paper is preferably 17.5 to 20.5 g/m ² , and the paper thickness is preferably 0.60 to 0.80 mm/10.

Using a tissue softness analyzer TSA (Tissue Softness Analyzer), a rotor with blades is pushed into the sample with the surface 10a on the outer side of the roll of one sheet of sanitary thin paper 10x placed on the sample table from above as a pushing pressure of 100 mN. After that, when the sample table is rotated at a rotation speed of 2.0 (/sec) and the vibration of the sample table is measured with a vibration sensor, the maximum peak intensity of the first spectrum from the low frequency side, automatically acquired by the software on the TSA. (TS750) is preferably 12 to 30 dBV ² rms, more preferably 12 to 25 dBV ² rms, and the maximum peak intensity (TS7) of the spectrum including 6500 Hz is preferably 14 to 26 dBV ² rms, more preferably 14 to 23 dBV. ² rms. Further, when the value of the above-mentioned TS750 with the surface of the sanitary thin paper facing upward (this is referred to as "TS750t") is set to 1, when the back surface 10b inside the roll of the sanitary thin paper 10x is facing upward, The ratio R (TS750b/TS750t) represented by the value of TS750 (which will be referred to as "TS750b") is preferably 1.06 to 2.30, more preferably 1.06 to 1.70.
Regarding the sample with the surface of sanitary thin paper facing upward, 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 softness is conspicuous and a good tactile sensation cannot be obtained. There are cases. If the value of TS750 (TS750t) is higher than the above range, the smoothness is poor, and if it is lower than the above range, the embossing process may be insufficient but the specific volume may be small even though the embossing process is smooth.

Embossing is applied to the sanitary thin paper, and TS750t on the front surface on the outer side of the roll is lower than TS750b on the rear surface on the inner side 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 between the tactile sensations on the front and back surfaces of the sanitary thin paper. When the ratio R exceeds 2.30, the difference between the tactile sensations on the front and back surfaces (the front and back difference in smoothness) becomes too large. On the other hand, when the ratio R is less than 1.06, the emboss depth becomes shallow and the emboss becomes weak, so that the emboss looks bad.

Rigidity (D) is measured by TSA with respect to the sample installed on the sample stage, when the rotor with blades is pushed from above with a pushing pressure of 100 mN and 600 mN respectively, and the pushing pressure is between 100 mN and 600 mN, respectively. It is represented by the amount of vertical displacement of the sample.
D is preferably 2.4 to 3.5 mm/N, and more preferably 2.7 to 3.5 mm/N.
When D is lower than the lower limit of the above range, it is inferior in flexibility, and when it is higher than the upper limit of the above range, suppleness stands out, while DMDT is low and easy to tear, and inferior in smoothness, resulting in an overall quality balance. Lack.

Here, as shown in FIG. 2, the tissue softness measuring device TSA210 performs vibration analysis on vibration data detected by various sensors when the rotor with blades 204 rotated is pressed from above the paper sample (sample) 206. It is used to quantitatively evaluate the softness (feel) of the paper by parameterizing (TS value), and the product name is manufactured by Emtec Electronic GmbH of Germany, Japan Luft Ltd. Is.
A specific measurement using TSA is as follows: (i) A sample 206 (a sample processed into a circular shape having a diameter of about 112.8 mm using a sample punch of emtec) is installed so as to cover the circular sample base 205 from the outside. , Holding the outer periphery of the sample 206 by the sample fixing ring 208, (ii) after pushing the rotor with blades 204 from above the sample 206 with a pushing pressure of 100 mN, rotate the rotor 204 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, at the pushing pressures of 100 mN and 600 mN, the deformation displacement amounts (mm/N, rigidity D) in the vertical direction when the sample 206 is deformed without rotating the rotor 204 are measured. By the steps (i) to (iv), each element (smoothness, suppleness, voluminousness) of the overall hand feel value of the product can be digitized. 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 pressing value of the rotor with blades 204 is controlled by the detection value of the force sensor 202. Further, the bladed rotor 204 is rotated by the motor 209.
In addition, emtec measurement system is used as software for performing 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 , HF (hand feel) value is calculated from the thickness, the Ply number, and the like according to various kinds of algorithms. In the present invention, only the TS7, TS750, and D are specified, not the HF value. 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 won't change.

FIG. 3 shows an example of the analysis result of the vibration frequency of the paper sample sample by TSA. The intensity of the maximum peak A of the first spectrum from the low frequency side is TS750, and the intensity of the maximum peak B of the spectrum including 6500 Hz (before and after 6500 Hz) is TS7. The maximum peak B is usually located at about 6500 Hz.
FIG. 4 shows a method for measuring the rigidity D of a paper sample sample by TSA.
Paper sample The vibration frequency of the 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. The first peak (A in FIG. 3) of the spectrum, TS750, indicates smoothness and roughness. On the other hand, the frequency at which TS7 appears (in the range of 5000 to 8000 Hz, usually around 6500 Hz) is the resonance frequency of the rotor 4, and when the horizontal vibration occurs on the paper surface, the instantaneous cutoff by the paper fiber and the rotor 4 are generated. Due to vibration. The rigidity D correlates with the rigidity (tensile strength) of the paper.
The lower the value of TS7, the better the fluffy feeling (surface softness and bulk softness), and the lower the value of TS750, the better the smoothness. Moreover, the greater the value of D, the more excellent the flexibility is. By defining TS750, D, and TS7, it is possible to quantitatively evaluate the softness (softness and smoothness) of sanitary thin paper, which has hitherto been subject to the evaluator's subjectivity.

It is preferable that the specific volume of the sanitary thin paper is 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 reduced, resulting in poor water absorption capacity. On the other hand, if the specific volume exceeds 5.5 cm ³ /g, the bulk (bulkness) increases, but the smoothness may be poor, the difference in smoothness between the front and back may be large, and the touch may be poor. The specific volume is preferably 3.5 to 5.0 cm ³ /g.

When the tensile strength in the dry direction based on JIS P8113 of one piece of sanitary thin paper is DMDT (Dry Machine Direction Tensile strength) and the tensile strength in the dry direction is DCDT (Dry Cross Direction Tensile strength) , DMDT is preferably 2.2 to 4.8 N/25 mm, more preferably 2.7 to 3.8 N/25 mm, DCDT is preferably 0.80 to 2.2 N/25 mm, more preferably 1.0 to 1. It is 0.5 N/25 mm.
If DMDT and DCDT are less than the above values, they may be easily shaken and not suitable for practical use. When DMDT and DCDT are higher than the above-mentioned values, it becomes hard and softness may be impaired.
The flow direction of sanitary thin paper is defined as "longitudinal direction" and the direction perpendicular to the flow direction is defined as "transverse direction".

The hygroscopicity (dropping amount of 0.01 ml) of one sheet of sanitary thin paper based on old JIS S3104 is preferably 3.5 seconds or less, more preferably 3.0 seconds or less. The higher the water absorption, the better, but if it exceeds the above range, the water absorption may be poor.
The unraveling easiness of one sheet of sanitary thin paper based on JIS-P4501 is preferably 60 seconds or less, more preferably 50 seconds or less. The ease of loosening is better when it is fast, but if it exceeds the above range, water disintegration in the toilet may be poor.

The sanitary thin paper may consist of 100% by weight of wood pulp, and may contain waste paper pulp and non-wood pulp. In order to obtain the target quality, it is preferable to use wood pulp of NBKP (softwood 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 manufactured from Eucalyptus genus Eucalyptus represented by Eucalyptus grandis and Eucalyptus globulus is preferable as the LBKP material. Alternatively, to the wood pulp having the above pulp ratio, up to about 60% by mass of waste paper pulp derived from a milk carton can be contained. Since the quality of waste paper pulp varies greatly, and the quality of the product, in particular, the softness of the waste pulp is greatly affected by an increase in the blending ratio, it is desirable to blend the waste pulp with 50 mass% or less, preferably 40 mass% or less.
In order to secure appropriate strength for sanitary thin paper, it is possible to mix the raw materials by an ordinary means and adjust the strength by beating the pulp fiber. As the beating to obtain the target quality, commercially available virgin pulp has a Canadian standard freeness measured by JIS-P8121 of 0 to 150 ml, more preferably 0 to 100 ml, and further preferably 10 to 50 ml. Reduce water level. It is also preferable not to use a wet strength agent.

When a virgin material is used for the stock, the sanitary thin paper can be prepared by blending a softwood kraft pulp and a hardwood kraft pulp having a fiber length and a fiber roughness within a certain range in a specific range. As an additive to paper materials, depending on the quality required for the final product, softeners including debonder softeners, bulking agents, dyes, dispersants, dry paper strength enhancers, drainage improvers, pitch control agents, absorbency Improvers, wetting agents and the like can be used.
When using a waste paper material as the sanitary thin paper, the same treatment as in the case of the virgin paper is performed.
The details of the method for manufacturing the sanitary thin paper will be described later.

The sanitary thin paper can be manufactured, for example, in the following order of (1) papermaking and creping, (2) calendering with a machine winder, (3) embossing and roll winding.

(1) Papermaking and creping,
First, a web is made from the above stock 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 by a suction pressure roll or a pressure roll or a press roll without suction, or dehydration is continued by a dehydration method such as ventilation drying with hot air. Suction pressure rolls or pressure rolls without suction are also used as a means to move the web from the press part to the Yankee dryer.

The web transferred to the Yankee dryer is dried by a Yankee dryer and a Yankee dryer hood, then creped by a creping doctor, and wound on a reel part.
Creping (making wavy wrinkles called crepes) is the mechanical compression of paper in the machine direction (the direction of sheet travel on a paper machine). Then, when the web of sanitary thin paper is manufactured, the web on the Yankee dryer is peeled off by the creping doctor and wound up by 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. ) Forms a crepe (wrinkle) with a creping doctor.
The quality required for sanitary thin paper, that is, bulkiness, softness, water absorption, surface smoothness, aesthetics (crepe shape), etc., depends on the speed difference. Although depending on the conditions such as the speed difference, the basis weight of the web on the reel after creping is about 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 be high and the paper may be stiff, and if it is less than 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 matters for those skilled in the art. In the present invention, the crepe ratio when producing sanitary thin 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 the machine winder 100. As described above, the reel 2 wound by the reel part after the crepe is set on the machine winder 100 and becomes the original roll 4. At this time, calendar processing is performed in two stages in the order of the first stack calender 101 and the second stack calender 102.
The paper thickness of the sanitary thin paper in the raw fabric roll 4 after the calendar treatment is preferably 0.60 to 1.10 mm/10 sheets, and more preferably 0.60 to 0.85 mm/10 sheets. The specific volume of the sanitary thin paper in the original roll 4 after the calendar treatment is preferably 3.0 to 4.8 cm3/g, more preferably 3.0 to 4.5 cm3/g. Furthermore, the difference ΔC (paper thickness before calendering−paper thickness after calendering) between sanitary thin papers before and after calendering is preferably 0.10 to 0.40 mm/10 sheets, and more preferably 0.15 to 0.15 sheets. 0.35 mm/10 sheets.
If ΔC exceeds the above range, the softness may be poor, and if less than the above range, the softness and smoothness may be poor.

Each of the calenders 101 and 102 preferably comprises two metal rolls, but one of the two rolls may be an elastic roll so that soft calendering can be performed.
The linear pressure of the calender is preferably 3.5 to 8.5 kg/cm, more preferably 4.5 to 8.0 kg/cm. When the linear pressure exceeds the above range, the bulk becomes small and the softness may be poor. Further, if the wire thickness is less than the above range, the bulk becomes large and the winding diameter DR of the roll becomes large. Further, it is preferable that the linear pressure of the second stack is higher than that of the first stack.
During the calendar process, the draw can be adjusted appropriately. It is preferable that the draw between the reel 2 and the original sheet 4 after the calendar treatment is 100 to 110%.
By calendering and adjusting the draw, 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 raw fabric 4 after the calendar treatment and before the embossing treatment is set to 17.5 to 22.0 g/m ² per sheet. Since the web is slightly stretched and the basis weight is lowered in the roll winding process described later, it is preferably 17.5 to 22.0 g/m ² which is slightly higher than the target basis weight of the sanitary thin paper roll 10 in the final form, and more preferably. It is set to 18.5 to 21.0 g/m ² .

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

By embossing in the roll winding machine 150, even if the basis weight per sheet of sanitary thin paper is in the range of 16.5 to 21.5 g/m ² , it is made bulky and soft and easy to unravel. Can be improved.
The difference ΔE (paper thickness before embossing-paper thickness after embossing) between sanitary thin paper before and after embossing is preferably -0.20 to 0.15 mm/10 sheets, more preferably -0.10. 0.10 mm/10 sheets. If ΔE exceeds the above range, the embossing treatment may be insufficient and the softness may be poor. If ΔE is less than the above range, the embossing treatment may be too strong, and the difference in smoothness between the front and back may become large. Here, before embossing has the same meaning as after calendering.
When the embossing process is performed, the paper thickness after the embossing process becomes higher than that before the embossing process, 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 it so that ΔE becomes −0.20 to 0.15 mm/10 sheets, while taking into consideration the influence of embossing and paper elongation.
The embossing strength can be controlled by appropriately adjusting the nip width between 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. When the nip width exceeds 40 mm, embossing becomes too strong and the difference between the front and back becomes large, or the paper thickness becomes high and the winding diameter DR of the roll becomes large. On the other hand, if the nip width is 20 mm or less, 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 measuring method, first, the nip of the embossing roll is released, and the carbon paper and the general copy paper are stacked and set. Next, a nip is applied to the embossing roll. Then release the nip and remove the carbon paper and copy paper. Since the color of the carbon paper at the part where the nip was applied by the embossing roll is transferred to the copy paper, the nip width can be measured.

At the same time, printing, embossing, perforation processing, tail sealing, and cutting with a predetermined width (114 mm, etc.) can be performed by the roll winding machine, and the sanitary thin paper roll 10 can be manufactured. Further, thereafter, film packaging processing can be carried out to manufacture a sanitary tissue roll package.

It is needless to say that the present invention is not limited to the above-described embodiments and covers various modifications and equivalents included in the concept and scope of the present invention.

The pulp composition (mass %) was NBKP 10%, LBKP 90%, and 35% of the waste paper raw material derived from the milk pack was blended with this raw material, and the equipment shown in FIGS. Was manufactured.

The following evaluation was performed.
The maximum load until breakage was measured in units of N/25 mm for one sheet of hygienic thin paper based on the tensile strength in dry direction DMDT and the tensile strength in dry direction DCDT: JIS P8113.
Basis weight: Measured based on JIS P8124 and converted per sheet of sanitary thin paper.
Paper thickness: Measured using a thickness gauge (dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho). The measurement conditions were a measurement load of 3.7 kPa, a probe diameter of 30 mm, a sample was placed between the probe and the measuring table, and the gauge was read when the probe was lowered at a speed of 1 mm or less per second. In addition, about the web before a calendar process, 10 sheets of sanitary thin paper were piled up for measurement, and after the calendering and after the roll, 10 sheets of sanitary thin paper were piled up. The measurement was repeated 10 times and the measurement results were averaged. Then, the obtained average value per sheet was divided by the number of sheets to obtain the sheet thickness per sheet of sanitary thin paper.
Specific volume: The thickness per sheet of sanitary thin paper was divided by the basis weight per sheet, and the volume was expressed in cm ³ per unit g.
Water absorption: According to the old JIS-S3104 method, 0.01 ml of purified water was added dropwise at a temperature of 23±1°C and a humidity of 50±2%, and the time (seconds) for the water droplet to be absorbed by one sheet of sanitary thin paper was measured. It was measured.
Loosenness: According to JIS P4501, the easiness of loosened one sanitary thin paper was measured.
Roll diameter DR: Measured using a diameter rule manufactured by Muratec KDS Co., Ltd. For the measurement, 10 rolls were measured and the measurement results were averaged.

The measurement of DTS7 and TS750 was performed using the above-mentioned tissue softness measuring device TSA. The measurement conditions are also as described above.
Sensory evaluation was performed by 20 monitors. The evaluation standard was 5 points. It is good if the evaluation standard is 3 points or more. The “embossed appearance” is an evaluation of whether or not the embossed shape can be visually recognized on the monitor.
In addition, the basis weight, tensile strength, thickness, specific volume, and measurement by the tissue softness measuring device TSA are equilibrium under the temperature and humidity conditions (23±1° C., 50±2% RH) specified in JIS-P8111. It was carried out after holding in the state.

The obtained results are shown in Tables 1 and 2.

As is clear from Table 1 and Table 2, each of the sanitary thin papers has a basis weight of 16.5 to 21.5 g/m ² and a paper thickness of 0.60 to 1.1 mm/10 or less. In the case of the example, the roll length of the sanitary thin 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 it is possible to increase the roll length per roll while reducing the basis weight and providing excellent texture and usability. did it.

On the other hand, in Comparative Example 1 in which the paper thickness was less than 0.6 mm/10 sheets, the softness was poor. It is thought that this is because the calender linear pressure exceeded 8.5 kg/cm, the paper thickness difference ΔC before and after calendering exceeded 0.40 mm/10 sheets, and the specific volume became less than 3.0 cm ³ /g. To be 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 became weak.
In Comparative Examples 2 to 4 in which the basis weight of each sanitary thin paper was less than 16.5 g/m ² , the tear resistance was poor.
In Comparative Examples 5 and 6 in which the basis weight per sheet of sanitary thin paper exceeded 21.5 g/m ² , the winding diameter of the roll exceeded 132 mm, and it was difficult to mount it on the paper holder. In Comparative Example 5, the paper thickness difference ΔE before and after embossing was more than 0.15 mm/10 sheets, and the embossing was weak, so the softness was poor. In Comparative Example 6, the difference in paper thickness ΔC before and after the calendering process was more than 0.40 mm/10 sheets, and the calendering process was too strong, resulting in poor softness.

In addition, in the case of Comparative Examples 1, 2, 4, and 5 in which R(TS750b/TS750t) was less than 1.06, the appearance of embossing was poor (Comparative Example 2) or 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 in smoothness between the front and back surfaces was large.
In the case of Comparative Example 4 in which TS750t was less than 12 dBV ² rms, although smooth, the embossing treatment was not sufficient and the specific volume was reduced to less than 3.0 cm ³ /g. In the case of Comparative Examples 3, 5 and 6 in which TS750t exceeded 30 dBV ² rms, smoothness was poor.
In the case of Comparative Example 3 in which TS7 was less than 14 dBV ² rms, only softness was conspicuous, smoothness was inferior, and good touch was not obtained.
In the case of Comparative Examples 1, 5, and 6 in which TS7 exceeded 26 dBV ² rms, the softness was poor.
In the case of Comparative Example 3 in which D was more than 3.5 mm/N, the flexibility was too high, the DMDT was low and the film was easily broken, and the smoothness was poor, and the overall quality balance was lacking.
In the case of Comparative Example 5 in which D was less than 2.4 mm/N, the flexibility was poor.

10 Sanitary thin paper roll 202 Force sensor 204 Rotor with blade 205 Sample stage 206 Sample 210 Tissue softness measuring device TSA

Claims (1)

A method for producing a sanitary thin paper roll , which is obtained by winding a single sheet of perforated sanitary paper into a roll, wherein the sanitary thin paper has a basis weight of 16.5 to 21.5 g/m ² , and a paper. The thickness is 0.6 to 1.1 mm/10 sheets,
The sanitary thin paper roll has a winding length of 120 to 185 m and a winding diameter of 100 to 132 mm,
A tissue softness measuring device TSA is used to push the sanitary thin paper placed on the sample table with the outer surface of the roll facing upward with the rotors with the blades pressed at a pushing pressure of 100 mN and 600 mN, respectively, without rotating the rotor. When
Represented by deformation amount of vertical displacement of the sample in between each pushing pressure 100mN and 600MN, measurement of stiffness (D) is Ri 2.4~3.5mm / N der,
The difference ΔE (paper thickness before embossing-paper thickness after embossing) before and after embossing the base paper is -0.20 to 0.15 mm/10 sheets,
The base paper is calendered before the embossing treatment, the calendered paper thickness is 0.60 mm to 1.10 mm/10 sheets, and the difference ΔC in paper thickness before and after the calendering is 0.10. ~0.40mm / 10 sheets der Ru sanitary thin paper method of manufacturing a roll.