JP2017185272A - Sanitary tissue paper roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sanitary tissue paper roll having excellent touch and use feeling without reducing a basis weight and also having a longer wound length per roll, and being in excellent in space saving properties during carrying and storage.SOLUTION: A sanitary paper roll 10 formed by winding a laminate 10x laminating two sheets of sanitary tissue paper, has a basis weight per sheet of the sanitary tissue paper of over 13 g/mand 17 g/mor less, a paper thickness thereof of over 0.6 mm/10 sheets and 1.1 mm/10 sheets or less, a wound length of the sanitary tissue paper of 74-93 m, and a wound diameter D thereof of 100-130 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-mentioned problem, the sanitary thin paper roll is a sanitary thin paper roll obtained by winding a laminate of two sanitary thin papers into a roll shape, and the basis weight per sheet of the sanitary thin paper is 13 g / m. ² to 17 g / m ² or less, and the paper thickness is more than 0.6 mm / 10 sheets and 1.1 mm / 10 sheets or less. The embossed single emboss is attached, the winding length of the sanitary thin paper roll is 74 to 93 m, and the winding diameter is 100 to 130 mm.

Using a tissue softness measuring device TSA, a bladed rotor is pushed into the sample with the outer surface of the roll of the laminate placed on the sample table up, and the blade is pushed from above with a pushing pressure of 100 mN. When the vibration of the sample stage is measured by 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 27 dBV ^2. rms, the intensity (TS7) of the maximum peak of the spectrum including 6500 Hz is 13 to 22 dBV ² rms, and when the value of TS750 is 1, the back surface inside the roll of the laminate is turned 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 roll of the laminate 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 2.3 to 3.5 mm / N.

The sanitary thin paper roll is manufactured by calendering a base paper, the paper thickness after the calendering is 0.65 mm to 1.00 mm, and the paper thickness difference ΔC before and after the calendering is 0.05 to It is preferable that it is 0.40 mm / 10 sheets.
It is preferable that the specific volume of the sanitary thin paper is 4.0 to 6.5 cm ³ / g.
The method for producing a sanitary thin paper roll according to the present invention is a method for producing a sanitary thin paper roll obtained by winding a laminate of two sanitary thin papers into a roll shape, and the basis weight per sanitary thin paper is 13 g. / M ² and 17 g / m ² or less, and the paper thickness is more than 0.6 mm / 10 sheets and 1.1 mm / 10 sheets or less, the base paper is calendered, and the paper thickness after the calendering is 0.65 mm. ~ 1.00mm and the paper thickness difference ΔC before and after the calendar process is 0.05 ~ 0.40mm / 10 sheets, the embossed surface on the outside of the roll is concave, and the embossed surface on the back is convex The thickness difference ΔE (paper thickness before embossing-paper thickness after embossing) of sanitary thin paper before and after embossing is −0.20 to 0.18 mm / 10 sheets And the sanitary thin leaf Winding length of the roll is 74～93M, winding diameter of 100～130Mm.

  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, a sanitary thin paper roll 10 according to an embodiment of the present invention is formed by winding a laminate 10x in which two sanitary thin papers are stacked into a roll, and the basis weight per sanitary thin paper is 1 13 g / m ² and 17 g / m ² or less, and the paper thickness is more than 0.6 mm / 10 sheets and 1.1 mm / 10 sheets or less, and the roll winding length (winding length) is 74 to 93 m. The diameter DR is 100 to 130 mm. 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 sanitary thin paper sheet is 13 g / m ² or less, or the paper thickness is 0.6 mm / 10 sheets or less, the strength decreases and the feeling of use (bulk height) also decreases. When the basis weight per sanitary thin paper exceeds 17 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 74 m or more is 130 mm. And 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.
If the roll length is less than 74 m, the roll length per roll becomes short, and space saving during storage cannot be achieved. When the roll length exceeds 93 m, the roll diameter DR (outer diameter of the roll) exceeds 130 mm, which makes it difficult to fit in a toilet paper holder or the like.
The basis weight per sanitary thin paper is preferably 14.0 to 16.0 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), press the rotor with blade 100mN against the sample with the outer surface 10a of the roll (double sanitary thin paper) 10x placed on the sample table facing up. The first spectrum from the low frequency side automatically acquired by software on the TSA when the pressure on the sample stage was measured with a vibration sensor after being pushed in from the top as the pressure and rotated at a rotation speed of 2.0 (/ sec) The maximum peak intensity (TS750) is preferably 12-27 dBV ² rms, more preferably 12-22 dBV ² rms, and the maximum peak intensity (TS7) of the spectrum including 6500 Hz is preferably 13-22 dBV ² rms, more It is preferably 13 to 19 dBV ² rms. Also, when the value of TS750 with the surface of the laminated body facing up (this is expressed as “TS750t”) is 1, when the back surface 10b inside the roll of the laminated body 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 1.60.
For samples with the surface of the laminate 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 the softness stands out and good tactile sensation cannot be obtained. There is a case. If the value of TS750 (TS750t) is higher than the above range, the smoothness is inferior. If it is lower than the above range, even if smooth, the embossing process is not sufficient, and play peeling may occur.

Embossing is given to a layered product, and TS750t of the surface used as the roll outside becomes lower than TS750b of the back used as the roll inside. 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 front and back of a laminated body, and when the ratio R exceeds 2.30, the difference of tactile sensation of the front and back (smooth front / back difference) will become large too much. On the other hand, when the ratio R is less than 1.06, the embossing depth is shallow, the embossing is weak, and the ply is easily peeled off.

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 2.3 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 4.0 to 6.5 cm ³ / g.
When the specific volume is less than 4.0 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 6.5 cm ³ / g, the bulk (bulk height) becomes high, but the smoothness may be inferior, the difference in smoothness between the front and back may be increased, and the tactile sensation may be deteriorated. The specific volume is preferably 4.3 to 5.7 cm ³ / g.

DMDT (Dry Machine Direction Tensile strength) is the tensile strength in the vertical direction when dried according to JIS P8113, and DCDT (Dry Cross Direction Tensile) is the transverse tensile strength when dried. strength)), DMDT is preferably 2.2 to 5.0 N / 25 mm, more preferably 2.7 to 4.0 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 water absorption based on the old JIS S3104 of the laminate (two-layer sanitary thin paper) 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 based on JIS-P4501 when the laminate is peeled into one sheet 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) ply-up and calendaring by a machine winder, and (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. Although depending on conditions such as the speed difference, the basis weight of the web on the reel after creping is approximately 14 to 20 g / m ² , which is heavier than the basis weight of the web on the Yankee dryer before creping. The basis weight is preferably 14 to 18 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) Ply-up and calendar processing by machine winder FIG. As described above, two reels 2 wound up by the reel part after creping are set on the machine winder 100, and the two reels 2 are overlapped with each other so that the Yankee surface is on the outer side. At this time, the calendar processing is performed in two stages in order of the calendar machine 101 of the first stack and the calendar machine 102 of the second stack after the ply-up. However, it is also possible to perform calendar processing before ply-up or using an on-machine calendar.
The paper thickness of the sanitary thin paper in the raw fabric roll 4 after the calendar process is preferably 0.65 mm to 1.00 mm / 10 sheets, more preferably 0.60 to 0.80 mm / 10 sheets. Further, the specific volume of the sanitary thin paper in the raw roll 4 after the calendar treatment is preferably 4.0 to 5.8 cm 3 / g, more preferably 4.0 to 5.3 cm 3 / g. Furthermore, the difference ΔC (paper thickness before calendar processing−paper thickness after calendar processing) of sanitary thin paper before and after calendar processing is preferably 0.05 to 0.40 mm / 10, more preferably 0.10. 0.40 mm / 10 sheets.
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 3.0 to 8.0 kg / cm, more preferably 4.0 to 7.0 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 before the ply-up and the original fabric 4 after the calendar process is preferably 100 to 110%.
By the calendar process and the draw adjustment, the paper thickness can be managed to exceed 0.6 mm / 10 sheets and to 1.1 mm / 10 sheets or less, while maintaining the basis weight exceeding 13 g / m ² and 17 g / m ² or less.

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 13.5 to 18.0 g / m ² per sheet. In the roll winding process described later, since the web is slightly stretched and the basis weight is also low, it is preferably 13.5 to 18.0 g / m ² slightly higher than the target basis weight of the sanitary thin paper roll 10 in the final form, more preferably It shall be 14.5-17.5 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 130 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.
Note that the machine winder 100 may be incorporated in the roll winder 150, and the roll-up machine may perform the ply-up, calendar processing, and embossing in this order. Alternatively, each hygienic thin paper sheet may be plyed up after the calendar process and embossed.

By performing embossing in roll winding machine 150, be in the range of 17 g / m ² or less than the basis weight per sheet is a 13 g / m ² of the sanitary thin paper, and softness by increasing the bulk, unraveling Ease 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 0.18 mm / 10, more preferably −0.10. 0.10 mm / 10 sheets. If ΔE exceeds the above range, the embossing may not be sufficient and the ply may peel off or 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 0.18 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 characteristics of the roll, but is preferably 20 to 40 mm, and more preferably 20 to 30 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 feeling of plumpness is lost or the ply is easily peeled off. 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 break is measured in units of N / 25mm for laminates (double-layer sanitary thin paper). It was measured.
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, 10 sheets of sanitary thin papers are measured, and after calendering (after ply-up) and rolls, 5 sheets (5 sets of sanitary thin papers stacked on 2 plies). ) Repeatedly. 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, 0.1 ml of purified water is dropped at a temperature of 23 ± 1 ° C. and humidity of 50 ± 2%, and the water droplets are absorbed by the laminate (double-layer sanitary thin paper). Time (seconds) was measured.
Ease of loosening: According to JIS P4501, a laminate of 2 plies was peeled off from a 1-ply sanitary thin paper, and the ease of loosening was measured.
Roll winding diameter DR: Measured using a Diameter Rule manufactured by Muratec KDS Corporation. 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 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, the basis weight per sanitary thin paper sheet exceeds 13 g / m ² and is 17 g / m ² or less, and the paper thickness exceeds 0.6 mm / 10 sheets and 1.1 mm / 10. In the case of each embodiment, the roll length of the sanitary thin paper roll is 74 to 93 m and the roll diameter is 100 to 130 mm. The roll length per roll is excellent in texture and feeling of use without lowering the basis weight. It was possible to lengthen.

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 8.0 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 4.0 cm ³ / g. It is done. In the case of 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 was weak and ply peeling occurred.
In the case of Comparative Examples 3 to 5 in which the basis weight per sanitary thin paper was less than 13 g / m ² , the resistance to tearing was poor.
In Comparative Examples 6 and 8 in which the basis weight per sanitary thin paper exceeded 17 g / m ² , the roll diameter of the roll exceeded 130 mm, making it difficult to attach to the paper holder. In Comparative Example 6, the paper thickness difference ΔE before and after the embossing process exceeded 0.18 mm / 10 sheets, and the embossing process was weak, so the ply was peeled off and the softness was inferior. In Comparative Example 8, 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, 3, 5, and 6 in which R (TS750b / TS750t) was less than 1.06, the ply was easily peeled off. On the other hand, in the case of Comparative Example 4 in which R exceeded 2.30, the difference in smoothness between the front and the back became large.
In the case of Comparative Example 5 in which TS750t was less than 12 dBV ² rms, it was smooth, but the embossing treatment was not sufficient, and play peeling occurred. In Comparative Examples 4, 6, and 8 in which TS750t exceeded 27 dBV ² rms, the smoothness was poor.
In the case of Comparative Example 4 in which TS7 is less than 13 dBV ² rms, only the softness is outstanding, the smoothness is inferior, and a good tactile sensation cannot be obtained.
In Comparative Examples 1, 6, and 8 in which TS7 exceeded 22 dBV ² rms, the softness was inferior.
In the case of Comparative Example 4 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 the overall quality.
In the case of Comparative Example 6 where D is less than 2.3 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-mentioned problems, the sanitary thin paper roll of the present invention is a sanitary thin paper roll obtained by winding a laminate of two sanitary thin papers into a roll shape, and has a basis weight per sheet of the sanitary thin paper. 13 g / m ² to 17 g / m ² or less, and the paper thickness is more than 0.6 mm / 10 sheets to 1.1 mm / 10 sheets , the sanitary thin paper roll has a winding length of 74 to 93 m and a winding diameter of 100 ˜130 mm , with a tissue softness measuring device TSA, a bladed rotor was pushed in from the top as a pushing pressure of 100 mN on a sample with the roll outer surface of the laminate placed on the sample table facing up , and the rotation speed was 2.0 ( / sec), and when the vibration of the sample stage is measured by a vibration sensor, the maximum peak of the first spectrum from the low frequency side automatically acquired by software on the TSA Strength (TS750) is 12~27dBV ² rms, a maximum peak intensity (TS7) is 13~22dBV ² rms spectrum containing 6500Hz, when one value of the TS750, roll inside of the laminate The value of TS750 when it is placed on the sample stage with the back side facing up is 1.06 to 2.30 .

The sanitary thin paper roll is manufactured by calendering a base paper, the paper thickness after the calendering is 0.65 mm to 1.00 mm / 10 sheets , and the paper thickness difference ΔC before and after the calendering is 0. It is preferably 0.05 to 0.40 mm / 10.
It is preferable that the specific volume of the sanitary thin paper is 4.0 to 6.5 cm ³ / g.
The method for producing a sanitary thin paper roll according to the present invention is a method for producing a sanitary thin paper roll obtained by winding a laminate of two sanitary thin papers into a roll shape, and the basis weight per sanitary thin paper is 13 g. / M ² and 17 g / m ² or less, and the paper thickness is more than 0.6 mm / 10 sheets and 1.1 mm / 10 sheets or less, the base paper is calendered, and the paper thickness after the calendering is 0.65 mm. ~ 1.00mm and the paper thickness difference ΔC before and after the calendar process is 0.05 ~ 0.40mm / 10 sheets, the embossed surface on the outside of the roll is concave, and the embossed surface on the back is convex The thickness difference ΔE (paper thickness before embossing-paper thickness after embossing) of sanitary thin paper before and after embossing is −0.20 to 0.18 mm / 10 sheets And the sanitary thin leaf Winding length of the roll is 74～93M, winding diameter of 100～130Mm.

Claims (6)

A sanitary thin paper roll obtained by winding a laminate of two sanitary thin papers into a roll, wherein the basis weight per sheet of the sanitary thin paper exceeds 13 g / m ² and is 17 g / m ² or less. Is 0.6 mm / 10 or more and 1.1 mm / 10 or less,
The embossed surface on the outside of the roll is concave, and the single embossed on the back is convex,
A sanitary thin paper roll having a roll length of 74 to 93 m and a roll diameter of 100 to 130 mm. Using a tissue softness measuring device TSA, a bladed rotor is pushed into the sample with the outer surface of the roll of the laminate placed on the sample table up, and the blade is pushed from above with a pushing pressure of 100 mN. 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 27 dBV ² rms, and the intensity of the maximum peak (TS7) of the spectrum including 6500 Hz is 13-22 dBV ² rms,
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 laminate is placed on the sample table with the back surface inside the roll facing up. roll. When the TSA was pressed from above with a pressing pressure of 100 mN and 600 mN without rotating the bladed rotor, the sample with the outer surface of the roll of the laminate placed on the sample table turned up,
The sanitary thin paper according to claim 2, wherein the measured value of rigidity (D), expressed by the amount of deformation in the vertical direction of the sample at an indentation pressure of 100 mN and 600 mN, is 2.3 to 3.5 mm / N. roll.   The sanitary thin paper roll is manufactured by calendering a base paper, the paper thickness after the calendering is 0.65 mm to 1.00 mm, and the paper thickness difference ΔC before and after the calendering is 0.05 to The sanitary thin paper roll according to any one of claims 1 to 3, which is 0.40 mm / 10 sheets. The specific volume of the said sanitary thin paper is 4.0-6.5 cm < ³ > / g, The sanitary thin paper roll in any one of Claims 1-4. A method for producing a sanitary thin paper roll in which a laminate of two sanitary thin papers is wound into a roll, wherein the basis weight per sheet of the sanitary thin paper exceeds 13 g / m ² and is 17 g / m ² or less, And the paper thickness is more than 0.6 mm / 10 sheets and 1.1 mm / 10 sheets or less,
The base paper is calendered, the paper thickness after the calendering is 0.65 mm to 1.00 mm, and the paper thickness difference ΔC before and after the calendering is 0.05 to 0.40 mm / 10 sheets,
The surface embossing on the outer surface of the roll is concave, the single embossing on the back is convex, and the difference in thickness of sanitary thin paper before and after embossing ΔE (paper thickness before embossing- The paper thickness after embossing is −0.20 to 0.18 mm / 10 sheets,
A method for producing a sanitary thin paper roll, wherein the sanitary thin paper roll has a winding length of 74 to 93 m and a winding diameter of 100 to 130 mm.