JP2018108437A - Sanitary thin paper roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sanitary thin paper roll excellent in the feel of touch and the feel of use without reducing a basis weight, and also excellent in space saving properties in carriage and storage by increasing the winding length of one roll.SOLUTION: In a sanitary thin paper roll 10 winding a sheet of sanitary thin paper 10x in a roll shape, a basis weight per sheet of sanitary thin paper is 16.5-21.5 g/m, the paper thickness is 0.6-1.1 mm/10 sheets or less, the winding length of the sanitary thin paper roll is 120-185 m, and the winding diameter D is 100-132 mm.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sanitary thin paper roll having a roll shape such as toilet tissue.

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.
For this reason, roll products with a longer winding length have been developed by reducing the basis weight per sheet of sanitary thin paper constituting the roll product to less than 13 g / m ² and further reducing the paper thickness to less than 60 μm. (Patent Document 1).

JP 2006-87703 A

However, when the basis weight of the paper constituting the roll product is lowered, the strength is lowered and the feeling of use and bulkiness are lowered. On the other hand, if the calendering is weakened to increase the bulk of the paper in order to compensate for these problems, there is a problem that the softness and smoothness are inferior or the roll diameter becomes large and it is difficult to fit in the toilet paper holder. Further, when embossing is strengthened, the paper thickness becomes too high, and there is a problem that the difference in feeling between use of the front and back of the paper becomes large. Further, if the paper is thinned by strengthening the calendar process without lowering the basis weight, the roll diameter can be reduced, but there is a problem that there is no softness and the quality is inferior.
Accordingly, an object of the present invention is to provide a sanitary thin paper roll which is excellent in texture and feeling of use without lowering the basis weight and has a long winding length per roll and is excellent in space saving at the time of carrying and storage.

In order to solve the above problems, a sanitary thin paper roll is a sanitary thin paper roll obtained by winding a sheet of sanitary thin paper having a perforation into a roll shape, and the basis weight per sheet of the sanitary thin paper is 16.5. 21.5 g / m ² , the paper 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.

Using a tissue softness measuring device TSA, a blade with a rotor of 100 mN is pushed in from the top of the sample with the outer surface of the sanitary thin paper roll placed on the sample table facing up, and then the rotation speed is 2.0 (/ sec) When the vibration of the sample stage is measured with a vibration sensor, the intensity of the maximum peak (TS750) of the first spectrum from the low frequency side automatically acquired by software on the TSA is 12 to 30 dBV ^2. rms, the intensity of the peak of the spectrum including 6500 Hz (TS7) is 14 to 26 dBV ² rms, and when the value of TS750 is 1, the back surface inside the roll of the sanitary thin paper is faced up and the sample table It is preferable that the value of TS750 when installed in is 1.06 to 2.30.

  When the sample with the outer surface of the sanitary thin paper roll placed on the sample table is turned up by the TSA, when the bladed rotor is pushed from above with a pushing pressure of 100 mN and 600 mN, respectively, It is preferable that the measured value of rigidity (D) expressed by the amount of deformation in the vertical direction of the sample between the indentation pressures of 100 mN and 600 mN is 2.4 to 3.5 mm / N.

  The sanitary thin paper roll is manufactured by calendering raw paper, the paper thickness after the calendering is 0.60 mm to 1.10 mm / 10 sheets, and the paper thickness difference ΔC before and after the calendering is 0. .10 to 0.40 mm / 10 is preferable.

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

It is a perspective view which shows the external appearance of the sanitary thin paper roll which concerns on embodiment of this invention. It is a figure which shows the measurement principle of tissue softness measuring apparatus 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.

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, the sanitary thin paper roll 10 according to the embodiment of the present invention is obtained by winding one sanitary thin paper 10x in a roll shape, and the basis weight per sanitary thin paper is 16.5-21. 0.5 g / m ² and a paper thickness of 0.6 to 1.1 mm / 10 sheets, a roll winding length (winding length) of 120 to 185 m, and a winding diameter DR of 100 to 132 mm. The winding length is preferably 145 to 185 m. The winding diameter DR is preferably 100 to 125 mm.
The method for adjusting the basis weight and thickness of sanitary thin paper per sheet to the above range will be described in detail later, but the calender conditions of the sanitary thin paper base web (paper thickness and specific volume after calendering, before and after calendering) Paper thickness difference) and embossing conditions (paper thickness and specific volume after embossing, paper thickness difference before and after embossing).

If 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 decreases and the feeling of use (bulkiness) also decreases. . When the basis weight per sanitary thin paper exceeds 21.5 g / m ² or the paper thickness exceeds 1.1 mm / 10 sheets, the laminate becomes thicker, and the roll diameter of the roll wound with 120 m or more is obtained. Exceeds 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 increases.
When the roll length of the roll is less than 120 m, the roll length per roll becomes short, and space saving during storage cannot be achieved. When the roll length 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 per 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 bladed rotor is pushed in from the top as a pushing pressure of 100 mN into a sample with the surface 10a outside the roll of a sheet of sanitary thin paper 10x placed on the sample table. The intensity of the maximum peak of the first spectrum from the low frequency side automatically acquired by software on the TSA when the vibration of the sample stage was measured with a vibration sensor after rotating at a rotation speed of 2.0 (/ sec). (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 ² rms. In addition, when the value of TS750 with the surface of the sanitary thin paper facing up (this is expressed as “TS750t”) is 1, when the back surface 10b inside the roll of the sanitary thin paper 10x is placed on the sample stage, The ratio R (TS750b / TS750t) represented by the value of TS750 (this is expressed as “TS750b”) is preferably 1.06 to 2.30, more preferably 1.06 to 1.70.
For samples with the sanitary thin paper surface up, if the TS7 value is higher than the above range, sufficient softness cannot be obtained, and if it is lower than the above range, only softness stands out and good tactile sensation cannot be obtained. There is a case. When the numerical value of TS750 (TS750t) is higher than the above range, the smoothness is inferior. When the numerical value is lower than the above range, the embossing is not sufficient even if it is smooth, and the specific volume may be small.

The sanitary thin paper is embossed and the surface TS750t on the outer side of the roll is lower than the 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.
And the said ratio R represents the difference of the tactile sensation of the sanitary thin paper, and when the ratio R exceeds 2.30, the difference in tactile sensation on the front and back (smooth front / back difference) becomes too large. On the other hand, if the ratio R is less than 1.06, the embossing depth becomes shallow, the embossing becomes weak, and the embossing looks worse.

Rigidity (D) is determined by TSA when the sample placed on the sample stage is pushed from above with a pushing pressure of 100 mN and 600 mN without rotating the bladed rotor. It is represented by the amount of deformation displacement in the vertical direction 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, the flexibility is inferior, and when it is higher than the upper limit of the above range, the flexibility is too conspicuous. On the other hand, DMDT is low and easily broken, and the smoothness is inferior. Lack.

Here, as shown in FIG. 2, the tissue softness measuring apparatus 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.
For specific measurement using TSA, (i) Install sample 206 (sample processed into a circle with a diameter of about 112.8 mm using emtec sample punch) to cover the circular sample stage 205 from the outside. The outer periphery of the sample 206 is held by the sample fixing ring 208. (ii) After the bladed rotor 204 is pushed from above the sample 206 with a pushing pressure of 100 mN, 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 in the sample table 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.

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. 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 (around 6500 Hz) is TS7. The maximum peak B is usually located at about 6500 Hz.
FIG. 4 shows a method for measuring the stiffness D of a paper sample sample by TSA.
The vibration frequency of the paper sample sample depends on the paper structure and the number of rotations of the rotor 4, and the amplitude (spectrum intensity) depends on the height of the paper structure such as the height of the crepe. TS750, which is the first peak in the spectrum (A in FIG. 3), represents 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. Due to vibration. The rigidity D correlates with the rigidity (tensile strength) of the paper.
The lower the TS7 value, the better the soft feeling (surface softness and bulk softness), and the lower the TS750 value, the better the smoothness. Moreover, the greater the value of D, the more flexible. By defining TS750, D and TS7, it is possible to quantitatively evaluate the softness (soft feeling and smoothness) of sanitary thin paper that has conventionally been subject to the evaluator's subjectivity.

The specific volume of the sanitary thin paper is preferably 3.0 to 5.5 cm ³ / g.
When 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 moisture absorption ability. On the other hand, when the specific volume exceeds 5.5 cm ³ / g, the bulk (bulk height) becomes high, but the smoothness is inferior, the smoothness difference between the front and back is increased, and the tactile sensation may be deteriorated. The specific volume is preferably 3.5 to 5.0 cm ³ / g.

When one sheet of sanitary thin paper is dried in accordance with JIS P8113, the longitudinal tensile strength during drying is DMDT (Dry Machine Direction Tensile strength), and the transverse tensile strength during drying is defined as 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, and DCDT is preferably 0.80 to 2.2 N / 25 mm, more preferably 1.0 to 1. .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 values, they become 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 “lateral direction”.

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

The sanitary thin paper may be composed of 100% by mass of wood pulp, and may include waste paper pulp and non-wood pulp. In order to obtain the target quality, it is preferable to use wood pulp of NBKP (conifer kraft pulp): LBKP (hardwood kraft pulp) = 0: 100 to 70:30 (mass ratio), 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 Eucalyptus eucalyptus represented by Eucalyptus genus Grandis and Eucalyptus globulus is preferred as the grade of LBKP. Or the waste paper pulp derived from a milk pack etc. can be included to about 60 mass% with respect to the wood pulp of the said pulp ratio. Waste paper pulp has a large variation in quality, and as the blending ratio increases, the quality of the product, particularly the softness, is greatly affected. Therefore, it is desirable to blend 50% by weight or less, preferably 40% by weight or less with respect to wood pulp.
In addition, in order to ensure appropriate strength for sanitary thin paper, raw materials can be blended by ordinary means, and the strength can be adjusted by beating the pulp fibers. As the beating to obtain the target quality, 0 to 150 ml, more preferably 0 to 100 ml, and more preferably 10 to 50 ml of a Canadian standard freeness measured according to JIS-P8121 is used for commercially available virgin pulp. Reduce water content. Moreover, it is preferable not to use a wet paper strength enhancer.

The sanitary thin paper can be made by blending a coniferous kraft pulp and a hardwood kraft pulp having a certain range of fiber length and fiber roughness in a specific range when a virgin raw material is 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, a wetting agent, or the like can be used.
When using waste paper raw material as sanitary thin paper, the same treatment as in the case of the virgin type is performed.
Details of the method of manufacturing sanitary thin paper will be described later.

  The sanitary thin paper can be produced, for example, in the following order: (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-mentioned stock on a wire part of a known paper machine, and moved to the felt of the press part. Examples of the wire part system include a round net type, a long net type (Ford Linear) type, a suction breast type, a short net type, a twin wire type, and a crescent former.
Then, the web is mechanically compressed with a suction pressure roll or a pressure roll or a press roll without suction, or dehydrated by a dehydration method such as aeration drying with hot air. The suction pressure roll or the pressure roll without suction is also used as a means for moving the web from the press part to the Yankee dryer.

The web moved to the Yankee dryer is dried by a Yankee dryer and a Yankee dryer hood, then creped by a creping doctor, and taken up by a reel part.
Creping (creating a wavy wrinkle called crepe) is to mechanically compress paper in the longitudinal direction (the sheet running direction on the paper machine). When manufacturing sanitary thin paper webs, the web on the Yankee dryer is peeled off by the creping doctor and wound on the reel part. The speed difference between the Yankee dryer and the reel part (reel part speed ≤ Yankee dryer speed) ), A crepe is formed by a creping doctor.
The quality required for sanitary thin paper, ie, bulk (bulk feeling), softness, water absorption, surface smoothness, aesthetics (crepe shape), and the like depend on the speed difference. Depending on the conditions such as the speed difference, the basis weight of the web on the reel after creping 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 be high and the paper may be stiff. If it is less than the above range, the strength may be weak and easy to tear.

Here, the crepe rate based on the speed difference between the Yankee dryer and the reel is defined by the following equation.
Crepe rate (%) = 100 × (Yankee dryer speed (m / min) −reel speed (m / min)) ÷ reel speed (m / min)
The quality and operability are largely determined by the creping conditions, and the operating conditions that optimize the creping conditions are important for those skilled in the art. In the present invention, the crepe rate when producing 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 up by the reel part after creping 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 calendar machine 101 of the first stack and the calendar machine 102 of the second stack.
The paper thickness of the sanitary thin paper in the raw fabric roll 4 after the calendar process is preferably 0.60 to 1.10 mm / 10, and more preferably 0.60 to 0.85 mm / 10. Moreover, the specific volume of the sanitary thin paper in the raw roll 4 after the calendar treatment is preferably 3.0 to 4.8 cm 3 / g, more preferably 3.0 to 4.5 cm 3 / g. Further, the difference ΔC (paper thickness before the calendar process−paper thickness after the calendar process) of the sanitary thin paper before and after the calendar process is preferably 0.10 to 0.40 mm / 10, more preferably 0.15. 0.35 mm / 10.
When ΔC exceeds the above range, the softness is inferior, and when it is less than the above range, the softness and smoothness may be inferior.

Each of the calender 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 calender 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. When the linear pressure exceeds the above range, the bulk becomes small and the softness may be inferior. Further, if the wire thickness is less than the above range, the bulk becomes large and the roll diameter DR of the roll becomes large. The linear pressure is preferably higher than the first stack.
During calendar processing, the draw can be adjusted appropriately. The draw between the reel 2 and the original fabric 4 after the calendar process is preferably 100 to 110%.
The paper thickness can be managed to be 0.6 mm to 1.1 mm / 10 while maintaining the basis weight at 16.5 to 21.5 g / m ² by calendar processing and draw adjustment.

It is preferable that the basis weight of the web of the raw fabric 4 after the calendar 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 lowered, so that it is preferably 17.5 to 22.0 g / m ² slightly higher than the target basis weight of the sanitary thin paper roll 10 in the final form, and more preferably. 18.5 to 21.0 g / m ² .

(3) Embossing and roll winding process FIG. 6 shows an example of a roll winding machine 150. The original fabric 4 is set on a roll winding machine 150, embossed by an 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 a winding mechanism 153. It is done. Thereafter, the original roll 10W is cut into a predetermined width (114 mm or the like) to become a sanitary thin paper 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, and the wound sanitary thin paper 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 sanitary thin paper 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 machine winder 100 may be incorporated in the roll winder 150, and the calendar process and the embossing process may be performed in this order by the roll winder.

By embossing in the roll winder 150, even if the basis weight per sanitary thin paper sheet is in the range of 16.5 to 21.5 g / m ² , the bulk is increased and the softness and ease of loosening are achieved. Can be improved.
The difference ΔE (paper thickness before embossing−paper thickness after embossing) of sanitary thin paper before and after embossing is preferably −0.20 to 0.15 mm / 10, more preferably −0.10. 0.10 mm / 10 sheets. When 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 process is too strong, and the smoothness may be increased. Here, “before embossing” has the same meaning as after calendar processing.
When the embossing process is performed, the paper thickness after the embossing process becomes higher than 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 take up the sheet so that ΔE is −0.20 to 0.15 mm / 10 sheets while taking into consideration the effects 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 roll characteristics, 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 front / back difference increases, or the paper thickness increases and the roll diameter DR of the roll increases. On the other hand, if the nip width is 20 mm or less, the embossing becomes weak and the appearance may deteriorate, 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 escaped, and carbon paper and general copy paper are stacked and set. Next, a nip is put on the embossing roll. Then, let the nip escape and remove the carbon paper and copy paper. Since the color of the carbon paper where the nip is applied by the embossing roll is transferred to the copy paper, the nip width can be measured.

  Simultaneously with the roll winding machine, printing, embossing, perforation, tail sealing, and cutting with a predetermined width (114 mm, etc.) can be performed, and the sanitary thin paper roll 10 can be manufactured. Furthermore, the package body of a sanitary thin paper roll can be manufactured by film packaging processing after that.

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

The following evaluation was performed.
Longitudinal tensile strength during drying DMDT and transverse tensile strength during drying DCDT: Based on JIS P8113, the maximum load until breakage was measured in units of N / 25 mm for one sanitary thin paper.
Basis weight: Measured based on JIS P8124 and converted per hygienic thin paper.
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. In addition, about the web before a calendar process, it measured by superimposing 10 sheets of sanitary thin paper, and after the calendar process and the roll, it performed by stacking 10 sheets of sanitary thin paper. The measurement was repeated 10 times and the measurement results were averaged. Then, the average value obtained per time was divided by the number of sheets to obtain the paper thickness per sanitary thin paper.
Specific volume: The thickness per sheet of sanitary thin paper was divided by the basis weight per sheet, and expressed as the volume cm ³ per unit g.
Water absorption: In accordance with the old JIS-S3104 method, 0.01 ml of purified water is dropped in a state of temperature 23 ± 1 ° C and humidity 50 ± 2%, and the time (seconds) that the water droplet is absorbed by one sanitary thin paper It was measured.
Unraveling ease: According to JIS P4501, the ease of unraveling one sanitary thin paper was measured.
Roll winding diameter DR: Measured using a Diameter Rule manufactured by Muratec KDS. The measurement measured 10 rolls and averaged the measurement results.

Measurement of DTS7 and TS750 was performed using the tissue softness measuring apparatus TSA. The measurement conditions are also 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 “emboss appearance” is an evaluation of whether or not the shape of the emboss can be visually recognized by a monitor.
The basis weight, tensile strength, thickness, specific volume, and measurement with the tissue softness measuring device TSA are balanced under the temperature and humidity conditions specified in JIS-P8111 (23 ± 1 ° C, 50 ± 2% RH). Performed after holding in state.

  The obtained results are shown in Tables 1 and 2.

As is clear from Tables 1 and 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 sheets 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 excellent in texture and feeling of use without lowering the basis weight and lengthening the roll length per roll. did it.

On the other hand, in the case of the comparative example 1 whose paper thickness is less than 0.6 mm / 10 sheets, it was inferior in softness. This is thought to be because the linear pressure of the calendar exceeded 8.5 kg / cm, the paper thickness difference ΔC before and after the calendar processing exceeded 0.40 mm / 10 sheets, and the specific volume became less than 3.0 cm ³ / g. It is done. Moreover, in the case of the comparative example 1, since the paper thickness difference ΔE before and after the embossing process was 0.18 mm / 10 sheets or more, the embossing process became weak.
In the case of Comparative Examples 2 to 4 in which the basis weight per sanitary thin paper was less than 16.5 g / m ² , the resistance to tearing was poor.
In Comparative Examples 5 and 6 in which the basis weight per sanitary thin paper exceeded 21.5 g / m ² , the roll 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 process exceeded 0.15 mm / 10 sheets, and the embossing process was weak, so the softness was inferior. In Comparative Example 6, the paper thickness difference ΔC before and after the calendar process exceeded 0.40 mm / 10 sheets, and the calendar process was too strong, so the softness was inferior.

In the case of Comparative Examples 1, 2, 4 and 5 in which R (TS750b / TS750t) is less than 1.06, the embossing looks inferior (Comparative Example 2) or the specific volume decreases (Comparative Example 1). 4) 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 the back 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 poor.
In the case of Comparative Example 3 in which TS7 was less than 14 dBV ² rms, only the softness was outstanding and the smoothness was inferior, so that 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 conspicuous, but DMDT was low and easily broken, and the smoothness was inferior, resulting in a lack of balance in overall quality.
In the case of Comparative Example 5 where D is less than 2.4 mm / N, the flexibility was inferior.

DESCRIPTION OF SYMBOLS 10 Sanitary thin paper roll 202 Force sensor 204 Bladed rotor 205 Sample stand 206 Sample 210 Tissue softness measuring device TSA

In order to solve the above problems, a sanitary thin paper roll is a sanitary thin paper roll obtained by winding a sheet of sanitary thin paper having a perforation into a roll shape, and the basis weight per sheet of the sanitary thin paper is 16.5. 21.5 g / ^{m 2,} and the sheet thickness is 0.6~1.1mm / 10 sheets, winding length of the sanitary thin paper roll 120～185M, winding diameter Ri 100~132mm der, the sanitary thin paper roll Is manufactured by calendering the base paper, the paper thickness after the calendering is 0.60 mm to 1.10 mm / 10 sheets, and the paper thickness difference ΔC before and after the calendering is 0.10 to 0 .40mm / Ru ten der.

Claims (4)

A sanitary thin paper roll obtained by winding a sheet of sanitary thin paper having a perforation into a roll, wherein the basis weight per sheet of the sanitary thin paper is 16.5 to 21.5 g / m ² and the paper thickness is 0. .6 to 1.1 mm / 10 sheets,
A sanitary thin paper roll having a roll length of 120 to 185 m and a roll diameter of 100 to 132 mm. Using a tissue softness measuring device TSA, a blade with a rotor of 100 mN is pushed in from the top of the sample with the outer surface of the sanitary thin paper roll placed on the sample table facing up, and then the rotation speed is 2.0 (/ sec) When the vibration of the sample stage is measured with a vibration sensor,
The intensity of the maximum peak (TS750) of the first spectrum from the low frequency side automatically acquired by software on the TSA is 12 to 30 dBV ² rms, and the intensity of the maximum peak (TS7) of the spectrum including 6500 Hz is 14-26 dBV ² rms,
2. The sanitary thin paper according to claim 1, wherein when the TS750 value is 1, the TS750 value is 1.06 to 2.30 when the TS 750 is placed on the sample table with the back surface inside the sanitary thin paper roll facing up. roll. When the sample with the outer surface of the sanitary thin paper roll placed on the sample table is turned up by the TSA, the bladed rotor is pushed from above with a pushing pressure of 100 mN and 600 mN without rotating.
The sanitary thin paper according to claim 2, wherein the measured value of rigidity (D) is 2.4 to 3.5 mm / N expressed by the amount of deformation in the vertical direction of the sample at an indentation pressure of 100 mN and 600 mN, respectively. roll.   The sanitary thin paper roll is manufactured by calendering raw paper, the paper thickness after the calendering is 0.60 mm to 1.10 mm / 10 sheets, and the paper thickness difference ΔC before and after the calendering is 0. The sanitary thin paper roll according to any one of claims 1 to 3, wherein the sanitary thin paper roll is 10 to 0.40 mm / 10 sheets.