JP6726653B2 - Sanitary thin paper roll and method of manufacturing the same - Google Patents

Description

The present invention relates to a sanitary thin paper roll having a roll shape such as toilet tissue and a method for manufacturing the same.

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 that the softness and smoothness are inferior and the roll diameter becomes large and it is 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 made thin without reducing the basis weight, the roll diameter can be made small, but there is a problem that the roll is not soft and the quality is poor.
Therefore, the object of the present invention is to provide a sanitary thin paper roll which is excellent in texture and feeling without lowering the basis weight, and which has a long winding length per roll, and which is excellent in space saving during carrying and storage, and a manufacturing method thereof. And

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 in which two sheets of sanitary thin paper are stacked into a roll, and has a paper thickness of 0.6 mm/10 sheets. It is more than 0.95 mm/10 sheets or less , the embossing on the surface on the outer side of the roll is concave, and the embossing on the back side is convex, and the single embossing is attached. 93 m, the winding diameter is 100 to 130 mm, the tensile strength of the laminate in the longitudinal direction during drying based on JIS P8113 is 2.2 to 5.0 N/25 mm in DMDT, and the sample softness is measured by a tissue softness measuring device TSA. For the sample with the outer surface of the roll of the laminate set up, when pushed from above with a pushing pressure of 100 mN and 600 mN without rotating the rotor with blades, respectively, the pushing pressure between 100 mN and 600 mN, respectively. The measured value of rigidity (D) represented by the amount of vertical deformation of the sample is 2.3 to 3.5 mm/N, and the laminated body installed on the sample table by the tissue softness measuring device TSA. For the sample with the outer surface of the roll facing up, the bladed rotor was rotated at a rotation speed of 2.0 (/sec) after being pressed from above as a pressing pressure of 100 mN, and the vibration of the sample table was measured with a vibration sensor. At this time, the intensity (TS750) of the maximum peak of the first spectrum from the low frequency side, which is automatically acquired by the software on the TSA, is 12 to 27 dBV ² rms, and the intensity of the maximum peak of the spectrum including 6500 Hz (TS7). ) Is 13 to 22 dBV ² rms, and when the value of TS750 is 1, the value of TS750 when installed on the sample table with the back surface of the inner side of the roll of the laminate facing up is 1.06 to 2. 30. 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 of the present invention is the method for producing a sanitary thin paper roll, wherein the base paper is calendered and the calendered paper thickness is 0.65 mm to 1.00 mm/10 sheets, and The difference ΔC between the thickness of the paper before and after calendering is set to 0.05 to 0.40 mm/10 sheets, and the embossing on the outside of the roll is concave and the embossing on the back is convex. In addition, the difference ΔE (paper thickness before embossing-paper thickness after embossing) between sanitary thin paper before and after embossing is set to -0.20 to 0.18 mm/10 sheets, and the sanitary thin paper roll is wound. The length is 74 to 93 m, and the winding diameter is 100 to 130 mm.

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, a sanitary thin paper roll 10 according to an embodiment of the present invention is obtained by winding a laminated body 10x in which two sanitary thin papers are stacked in a roll shape, and the basis weight of each sanitary thin paper is 10. The roll length is more than 13 g/m ² and 17 g/m ² or less, the paper thickness is more than 0.6 mm/10 sheet and 1.1 mm/10 sheet or less, and the roll 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.
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).

If the basis weight per sheet of sanitary thin paper is 13 g/m ² or less or the paper thickness is 0.6 mm/10 sheets or less, the strength is lowered and the feeling of use (bulkness) is also lowered. When the grammage per sheet of sanitary thin paper exceeds 17 g/m ² or the paper thickness exceeds 1.1 mm/10 sheets, the laminated body becomes thick, and the roll diameter obtained by winding this 74 m or more is 130 mm. It will be difficult to fit in the toilet paper holder, and the difference in the feeling of use between the front and back of the paper will increase.
If the roll length is less than 74 m, the roll length per roll becomes short, and space saving during storage cannot be achieved. A roll having a roll length of more than 93 m has a roll diameter DR (outer diameter of the roll) of more than 130 mm and is difficult to fit in a toilet paper holder or the like.
The sanitary thin paper preferably has a basis weight of 14.0 to 16.0 g/m ² , and a paper thickness of 0.60 to 0.80 mm/10.

Using a tissue softness measuring device TSA (Tissue Softness Analyzer), a rotor with a blade is pushed into the sample with the surface 10a on the outer side of the roll of the laminated body (two sheets of sanitary thin paper) 10x installed on the sample table facing up by 100 mN. The first spectrum from the low frequency side that was automatically acquired by the software on the TSA when the vibration of the sample stage was measured by the vibration sensor after rotating it at a rotation speed of 2.0 (/sec) after pushing it in from above as pressure. The maximum peak intensity (TS750) is preferably 12 to 27 dBV ² rms, more preferably 12 to 22 dBV ² rms, and the maximum peak intensity (TS7) of the spectrum including 6500 Hz is preferably 13 to 22 dBV ² rms. It is preferably 13 to 19 dBV ² rms. Further, when the value of the above-mentioned TS750 with the surface of the laminated body facing upward (this is referred to as “TS750t”) is set to 1, when the back surface 10b inside the roll of the laminated body 10x is placed 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 1.60.
Regarding the sample with the surface of the laminate 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 the softness is conspicuous and a good tactile sensation cannot be obtained. There are cases. When the value of TS750 (TS750t) is higher than the above range, the smoothness is poor, and when the value is lower than the above range, the embossing process is not sufficient but the play peeling may occur even though it is smooth.

Embossing is applied to the laminate, 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 sides of the laminate, and when the ratio R exceeds 2.30, the difference between the tactile sensations on the front and back sides (the difference between the front and back of smoothness) becomes too large. On the other hand, when the ratio R is less than 1.06, the embossing depth becomes shallow, the embossing is weak, and the ply is easily peeled off.

Rigidity (D) is measured by TSA with respect to the sample installed on the sample stage, when the rotor with blade is not rotated but is pushed in from above with the pushing pressures of 100 mN and 600 mN, respectively. It is represented by the amount of vertical displacement 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, it is inferior in flexibility, and when it is higher than the upper limit of the above range, flexibility is too conspicuous. On the other hand, DMDT is low and easy to tear, and inferior in smoothness, resulting in 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 manufactured by emtec) is installed so as to cover the circular sample base 205 from the outside. , The outer periphery of the sample 206 is held by the sample fixing ring 208, (ii) after the rotor with blades 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 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), the elements (smoothness, suppleness, volume) of the overall handfeel 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.

The specific volume of the sanitary thin paper is preferably 4.0 to 6.5 cm ³ /g.
If 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 water absorption capacity. On the other hand, when the specific volume exceeds 6.5 cm ³ /g, the bulk (bulk height) increases, but the smoothness may be poor, the difference in smoothness between the front and back may be large, and the tactile sensation may be poor. The specific volume is preferably 4.3 to 5.7 cm ³ /g.

DMDT (Dry Machine Direction Tensile strength) is the longitudinal tensile strength of the laminated body (two sheets of sanitary thin paper) in the dry direction based on JIS P8113, and DCDT (Dry Cross Direction Tensile) is the tensile strength in the lateral direction of the dried body. 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 It is 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-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 water absorption of the laminate (two-ply 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 easiness of loosening based on JIS-P4501 when peeling the laminate into one sheet is preferably 60 seconds or less, and 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 the increase of the blending ratio, it is desirable to blend the pulp with 50% by mass or less, preferably 40% by mass or less with respect to the wood pulp.
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.
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) ply-up and 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 it depends on the conditions such as the speed difference, the basis weight of the web on the reel after creping is about 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, 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) Ply-up and calendar processing by machine winder FIG. 5 shows an example of the machine winder 100. As described above, two reels 2 wound by the reel part after the crepe are set in the machine winder 100, and the reels 2 are piled up and plied up so that the Yankee surface is on the outside, thereby forming the original roll 4. At this time, calendering is performed in two stages in the order of the first stack calender 101 and the second stack calender 102 after ply-up. However, it is also possible to perform calendar processing before ply-up or on-machine calendar.
The paper thickness of the sanitary thin paper in the raw fabric roll 4 after the calendar treatment is preferably 0.65 mm to 1.00 mm/10 sheets, and 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 cm3/g, more preferably 4.0 to 5.3 cm3/g. Further, the difference ΔC (paper thickness before calendering−paper thickness after calendering) between sanitary thin papers before and after calendering is preferably 0.05 to 0.40 mm/10 sheets, more preferably 0.10 to 10 mm. 0.40 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 3.0 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 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. The draw between the reel 2 before the ply-up and the raw material 4 after the calendaring is preferably 100 to 110%.
By calendering and adjusting the draw, the paper weight can be controlled to exceed 0.6 mm/10 sheets and 1.1 mm/10 sheets or less while maintaining the basis weight to more than 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 calendering treatment and before the embossing treatment is 13.5 to 18.0 g/m ² per sheet. In the roll winding process described below, the web slightly expands and the basis weight also decreases. Therefore, it is preferably 13.5 to 18.0 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 14.5 to 17.5 g/m ² .

(3) Embossing processing and roll winding processing FIG. 6 shows an example of the roll winding processing machine 150. The material 4 is set on the roll winding machine 150, embossed by the embossing unit (embossing roll) 151, and then wound by the winding mechanism 153 on the wide sanitary thin paper roll 10W having a winding diameter of 100 to 130 mm. 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.
Alternatively, the machine winder 100 may be incorporated in the roll winding machine 150, and the roll winding machine may perform ply-up, calendering, and embossing in this order. Alternatively, one sheet of sanitary thin paper may be calendered and then plied up and embossed.

By embossing with the roll winding machine 150, even if the basis weight of each sheet of sanitary thin paper is in the range of more than 13 g/m ² and 17 g/m ² or less, the bulkiness is increased and the softness and unraveling are achieved. The ease 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 0.18 mm/10 sheets, and more preferably -0.10. 0.10 mm/10 sheets. When ΔE exceeds the above range, the embossing treatment may not be sufficient and the ply may be peeled off or the softness may be poor. When 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, the paper is stretched and wound, so that 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 is −0.20 to 0.18 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 20 to 30 mm. If the nip width exceeds 40 mm, the 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, when the nip width is 20 mm or less, the emboss becomes weak, the plump feeling is lost, and 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 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 is 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.
Longitudinal tensile strength during drying DMDT and lateral tensile strength during drying DCDT: Based on JIS P8113, the maximum load until breakage in units of N/25 mm for a laminate (two sheets of sanitary thin paper) It was measured.
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. For the web before calendering, 10 sheets of sanitary thin paper were piled up for measurement, and after the calendering (after ply-up) and for the roll, 5 sheets of laminated sanitary thin paper were stacked on 2 plies (5 sets). I did it again. 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, 0.1 ml of purified water is dropped at a temperature of 23±1°C and a humidity of 50±2%, and the water droplets are absorbed by the laminate (two sheets of sanitary thin paper). The time (seconds) was measured.
Looseness: According to JIS P4501, the 2-ply laminate was peeled off from a 1-ply sanitary thin paper, and the easiness of loosening 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.
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 the state.

The obtained results are shown in Tables 1 and 2.

As is clear from Tables 1 and 2, the basis weight per sheet of sanitary thin paper exceeds 13 g/m ² and 17 g/m ² or less, and the paper thickness exceeds 0.6 mm/10 sheets and 1.1 mm/10 sheets. In the case of each number of sheets or less, the roll length of the sanitary thin paper roll is in the range of 74 to 93 m and the roll diameter is in the range of 100 to 130 mm, and the texture and feel are excellent without lowering the basis weight and the roll length per roll. Could be made longer.

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 considered that this is because the calender linear pressure exceeded 8.0 kg/cm, the paper thickness difference ΔC before and after calendering exceeded 0.40 mm/10 sheets, and the specific volume became less than 4.0 cm ³ /g. To be In the case of Comparative Example 1, the difference in paper thickness ΔE before and after the embossing treatment was 0.18 mm/10 sheets or more, so the embossing treatment was weak and the ply peeled off.
In the case of Comparative Examples 3 to 5 in which the basis weight of each sanitary thin paper was less than 13 g/m ² , the tear resistance was poor.
In Comparative Examples 6 and 8 in which the basis weight of each piece of sanitary thin paper exceeded 17 g/m ² , the winding diameter of the roll exceeded 130 mm, and it was difficult to mount it on the paper holder. In Comparative Example 6, the paper thickness difference ΔE before and after embossing was more than 0.18 mm/10 sheets, and the embossing was weak, so the ply was peeled off and the softness was poor. Further, in Comparative Example 8, the paper thickness difference ΔC before and after the calendering process was more than 0.40 mm/10 sheets, and the calendering process was too strong, so the softness was poor.

In the case of Comparative Examples 1, 3, 5, and 6 in which R (TS750b/TS750t) was less than 1.06, the plies were 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 back surfaces was large.
In the case of Comparative Example 5 in which the TS750t was less than 12 dBV ² rms, although the surface was smooth, the embossing treatment was insufficient and play separation occurred. In the case of Comparative Examples 4, 6 and 8 in which TS750t exceeded 27 dBV ² rms, smoothness was poor.
In the case of Comparative Example 4 in which TS7 was less than 13 dBV ² rms, only softness was conspicuous, smoothness was poor, and good tactile sensation was not obtained.
In the case of Comparative Examples 1, 6, and 8 in which TS7 exceeded 22 dBV ² rms, the softness was poor.
In the case of Comparative Example 4 in which D was more than 3.5 mm/N, the flexibility was too high, the DMDT was low and the film was easy to tear, and the smoothness was poor, and the overall quality balance was lacking.
In the case of Comparative Example 6 in which D was less than 2.3 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 (2)

A sanitary thin paper roll obtained by winding up a laminated body of two sheets of sanitary thin paper in a roll shape, having a paper thickness of more than 0.6 mm/10 sheets and 0.95 mm /10 sheets or less ,
The embossing on the outside of the roll is concave, and the embossing on the back is convex.
The sanitary thin paper roll has a winding length of 74 to 93 m, a winding diameter of 100 to 130 mm,
The laminate has a tensile strength DMDT in the machine direction of 2.2 to 5.0 N/25 mm when dried according to JIS P8113.
When the tissue softness measuring device TSA is used to push a sample with the outer surface of the roll of the laminate placed on the sample table up, without pushing the rotor with blades, at a pushing pressure of 100 mN and 600 mN, respectively. ,
The measured value of the rigidity (D), which is represented by the amount of vertical deformation of the sample between the pushing pressures of 100 mN and 600 mN, is 2.3 to 3.5 mm/N,
With the tissue softness measuring device TSA, the rotor with blades was pressed from above with a pressing force of 100 mN to the sample with the outer surface of the roll of the laminate installed on the sample table facing up, and the rotation speed was 2.0 ( /sec), and when measuring the vibration of the sample table with a vibration sensor,
The maximum peak intensity (TS750) of the first spectrum from the low frequency side, which was automatically acquired by the software on TSA, is 12 to 27 dBV ² rms, and the maximum peak intensity (TS7) of the spectrum including 6500 Hz is 13 to 22 dBV ² rms,
When the value of TS750 is set to 1, the value of TS750 is 1.06 to 2.30 when installed on the sample table with the back surface of the inner side of the roll facing up .
A sanitary tissue paper roll, wherein the specific volume of the sanitary tissue paper is 4.0 to 6.5 cm ³ /g . A method for manufacturing a sanitary thin paper roll according to claim 1,
The base paper is calendered so that the calendered paper has a thickness of 0.65 mm to 1.00 mm/10 sheets, and the difference ΔC in the paper thickness before and after the calendering is 0.05 to 0.40 mm/10 sheets. ,
The embossing on the outside surface of the roll is concave, and the embossing on the back side is convex, and a single embossing is applied, and the difference ΔE (paper thickness before embossing-paper thickness before embossing- (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.