JP2021171572A - Tissue paper product and manufacturing method for tissue paper product - Google Patents

Abstract

To provide a tissue paper product which is excellent in water absorption, is less likely to be broken, and is capable of improving softness and smoothness of the surface.SOLUTION: A tissue paper product combines 2ply sheets. Mass% of broad-leaved tree bleached kraft pulp ranges between 40% and 90%. Mass% of conifer bleached kraft pulp ranges between 10% and 60%. Basis weight of a 1ply sheet ranges between 13 g/m2 and 19 g/m2. First vibration stimulation value in a first area where frequency ranges between 1 Hz and 3 Hz ranges between 40 V/s and 100 V/s. Second vibration stimulation value in a second area where frequency ranges between 3 Hz and 40 Hz ranges between 20 V/s and 70 V/s. Third vibration stimulation value in a third area where frequency ranges between 40 Hz and 1000 Hz ranges between 70 V/s and 120 V/s.SELECTED DRAWING: Figure 21

Description

The present invention relates to a tissue paper product and a method for manufacturing the tissue paper product.

Tissue paper products are required to be comfortable to use. For example, Patent Document 1 describes an example of a tissue paper product having high strength, bulkiness, and a good tactile sensation.

Japanese Unexamined Patent Publication No. 2013-236904

By the way, there is a demand for tissue paper products that are even more comfortable to use. Specifically, the tissue paper product is required to have good water absorption, a soft touch, a smooth surface, and a resistance to tearing. For example, a lotion tissue paper product has a smooth surface, but its strength is reduced due to the application of a chemical solution, and it is easily torn. If the basis weight of the tissue paper product to which the chemical solution is not applied is increased in order to improve the water absorption and make it difficult to tear, the tactile sensation becomes hard and the smoothness of the surface is impaired.

The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide a tissue paper product which has good water absorption, is hard to tear, and can improve softness and surface smoothness. ..

In order to achieve the above object, the tissue paper product of the present disclosure is a tissue paper product in which 2 ly sheets are combined, and the mass% of broadleaf bleached kraft pulp is 40% or more and 90% or less, and conifer bleached kraft. The mass% of pulp is 10% or more and 60% or less, the basis weight of a 1-py sheet is 13 g / m ² or more and 19 g / m ² or less, and the vibration of the tissue paper product measured using a vibration measuring device. Of the vibration stimulation values calculated based on the characteristics and the value of the minimum vibration detection threshold approximation line, the first vibration stimulation value in the first region where the frequency is 1 Hz or more and 3 Hz or less is 40 V / s or more and 100 V / s or less. Yes, the second vibration stimulus value in the second region where the frequency is greater than 3 Hz and 40 Hz or less among the vibration stimulus values is 20 V / s or more and 70 V / s or less, and the frequency is 40 Hz among the vibration stimulus values. The third vibration stimulus value in the third region, which is larger and 1000 Hz or less, is 70 V / s or more and 120 V / s or less.

By having the above-mentioned raw material composition and basis weight, the tissue paper product easily absorbs water and is hard to tear. Further, when the first vibration stimulus value, the second vibration stimulus value and the third vibration stimulus value are within the above-mentioned ranges, the tactile sensation is soft and the surface is smooth while maintaining high water absorption and resistance to tearing. Tissue paper products are realized. Therefore, the tissue paper product of the present disclosure has good water absorption and is hard to tear, and can improve softness and surface smoothness.

The tissue paper product of the present disclosure has a dry longitudinal strength of 200 gf / 25 mm or more and 440 gf / 25 mm or less, which is a longitudinal tensile strength during drying, and a dry lateral strength of 90 gf, which is a lateral tensile strength during drying. It is preferably / 25 mm or more and 220 gf / 25 mm or less, and the aspect ratio, which is the ratio of the dry longitudinal strength to the dry lateral strength, is 1.4 or more and 3.0 or less.

Thereby, the tissue paper product of the present disclosure can improve the level of sensory evaluation regarding the resistance to tearing, the softness of touch and the smoothness of the surface.

In the tissue paper product of the present disclosure, it is preferable that the TS750, which is an index measured by the tissue softness analyzer, is 8.5 dBV ² rms or more and 13.5 dBV ² rms or less.

Thereby, the tissue paper product of the present disclosure can improve the level of sensory evaluation regarding the resistance to tearing, the softness of touch and the smoothness of the surface.

In the tissue paper product of the present disclosure, the thickness of the sheet is preferably 0.7 mm / 10 ply or more and 1.3 mm / 10 ply or less.

Thereby, the tissue paper product of the present disclosure has high water absorption and can improve the level of sensory evaluation regarding the resistance to tearing, the softness of touch and the smoothness of the surface.

The tissue paper product of the present disclosure preferably has a water absorption of 0.8 seconds or more and 2.0 seconds or less.

Thereby, the tissue paper product of the present disclosure has high water absorption and can improve the level of sensory evaluation regarding the resistance to tearing, the softness of touch and the smoothness of the surface.

The tissue paper product of the present disclosure preferably has a long side length of 200 mm or more and 240 or less, and a short side length of 196 mm or more and 236 mm or less.

As a result, the tissue paper product of the present disclosure has a size that is easy to use when blowing the nose or wiping off liquid or the like, so that the usability can be improved.

In the method for producing the tissue paper product of the present disclosure, the mass% of the broadleaf bleached kraft pulp is 40% or more and 90% or less, the mass% of the softwood bleached kraft pulp is 10% or more and 60% or less, and the tsubo of a 1-py sheet. A method for producing a tissue paper product having an amount of 13 g / m ² or more and 19 g / m ² or less, and a papermaking speed at the time of papermaking is 800 m / min or more and 1600 m / min or less. When the speed of ejecting upward is J and the wire speed of the paper machine is W, the J / W is 0.94 or more and 0.99 or less.

The appropriate J / W range varies depending on the raw material composition and basis weight of the tissue paper product. When manufacturing a tissue paper product having the above-mentioned raw material composition and basis weight, the papermaking speed at the time of papermaking is 800 m / min or more and 1600 m / min or less, and the J / W is 0.94 or more and 0.99 or less. It is possible to realize a tissue paper product with a soft touch and a smooth surface while maintaining high water absorption and resistance to tearing.

The tissue paper product of the present disclosure has good water absorption and is hard to tear, and can improve softness and surface smoothness.

FIG. 1 is a schematic view of the vibration measuring device of the embodiment. FIG. 2 is a perspective view of the main body of the vibration measuring device and the linear motion mechanism. FIG. 3 is a diagram showing the performance of the linear motion mechanism. FIG. 4 is a perspective view of the fixing mechanism of the vibration measuring device. FIG. 5 is a perspective view of the fixing mechanism of the vibration measuring device in a state where the sanitary tissue paper is supported. FIG. 6 is a perspective view of the pinching mechanism of the vibration measuring device. FIG. 7 is a perspective view of the sensor unit of the pinching mechanism. FIG. 8 is an exploded perspective view of the sensor unit of the pinching mechanism. FIG. 9 is a side view of the contactor of the sensor unit. FIG. 10 is a diagram showing the performance of the sensor. FIG. 11 is a plan view of the middle plate of the sensor unit. FIG. 12 is a diagram showing a material for producing silicone rubber. FIG. 13 is a perspective view of a mold used for molding a contact. FIG. 14 is a perspective view of the mold with the middle plate fitted. FIG. 15 is a perspective view of the pinching unit of the pinching mechanism. FIG. 16 is an exploded perspective view of the pinching unit of the pinching mechanism. FIG. 17 is a schematic view for explaining the movement of the movable plate of the pinching mechanism. FIG. 18 is a schematic view for explaining the movement of the movable plate of the pinching mechanism. FIG. 19 is a graph showing a vibration waveform measured by a vibration measuring device. FIG. 20 is a diagram showing the calculated amplitude spectrum. FIG. 21 is a diagram showing a vibration detection threshold curve. FIG. 22 is a diagram showing a minimum vibration detection threshold approximation line. FIG. 23 is a diagram showing an amplitude spectrum and a minimum vibration detection threshold approximation line. FIG. 24 is a diagram showing the calculated first vibration stimulus value, second vibration stimulus value, and third vibration stimulus value.

Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiment for carrying out the present invention (hereinafter referred to as the embodiment). In addition, the components in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, that is, those in a so-called equal range. Further, the components disclosed in the following embodiments can be appropriately combined.

(Embodiment)
The tissue paper product of this embodiment comprises a combined 2ply sheet. Tissue paper products are also called sanitary tissue paper. The tissue paper product is, for example, a facial tissue. The tissue paper product of the present embodiment is manufactured using a paper machine. In the tissue paper product of the present embodiment, the mass% of hardwood bleached kraft pulp (LBKP) as a raw material is 40% or more and 90%, and the mass% of softwood bleached kraft pulp (NBKP) as a raw material is 10% or more and 60%. It is as follows. More preferably, the mass% of the hardwood bleached kraft pulp is 50% or more and 80%, and the mass% of the softwood bleached kraft pulp is 20% or more and 50% or less. More preferably, the mass% of the hardwood bleached kraft pulp is 50% or more and 80%, and the mass% of the softwood bleached kraft pulp is 20% or more and 50% or less. More preferably, the mass% of the hardwood bleached kraft pulp is 55% or more and 75%, and the mass% of the softwood bleached kraft pulp is 25% or more and 45% or less.

The tissue paper product of the present embodiment may contain recycled paper pulp as a raw material. An example of recycled paper pulp is Milk Carton Secondary Fiber (MSF). For example, the mass% of recycled paper pulp is preferably 10% or more and 30% or less. More preferably, the mass% of the recycled paper pulp is 10% or more and 20% or less.

In the tissue paper product of the present embodiment, the basis weight of the sheet of 1 ly is 13.0 g / m ² or more and 19.0 g / m ² or less. More preferably, the 14.0 g / ^{m 2} or more 18.0 g / ^{m 2} or less. More preferably, it is 14.5 g / m ² or more and 17.5 g / m ² or less.

In the tissue paper product of the present embodiment, the dry machine direction tensile strength (DMDT), which is the tensile strength in the vertical direction during drying, is 200 gf / 25 mm or more and 440 gf / 25 mm or less. The vertical direction is the direction along the flow direction of the paper machine. The dry cross direction tensile strength (DCDT), which is the tensile strength in the lateral direction during drying, is 90 gf / 25 mm or more and 220 gf / 25 mm or less. The lateral direction is a direction orthogonal to the flow direction of the paper machine. The dry longitudinal strength and the dry lateral strength are measured based on JIS P8113. The aspect ratio, which is the ratio of the dry vertical strength to the dry horizontal strength, is 1.4 or more and 3.0 or less. More preferably, the dry longitudinal strength is 230 gf / 25 mm or more and 410 gf / 25 mm or less. More preferably, the dry lateral strength is 110 gf / 25 mm or more and 200 gf / 25 mm or less.

In the tissue paper product of the present embodiment, the TS750 is 8.5 dBV ² rms or more and 13.5 dBV ² rms or less. More preferably, TS750 is 9.0 dBV ² rms or more and 13.1 dBV ² rms or less. The TS750 is an index measured by, for example, a Tissue Softness Analyzer (TSA) manufactured by Emtec. The tissue softness analyzer is also called a tissue softness measuring device. The tissue softness analyzer is a device that can measure the tactile sensation of a tissue paper product and calculate the tactile sensation of a person from the measurement result.

In the tissue softness analyzer, the object to be measured (tissue paper product) is installed on the sample table. The object to be measured (tissue paper product) is fixed under the measuring head with a blade. The measuring head rotates while pressing against the sample at a predetermined pressure. The predetermined pressure is 100 mN. The rotation speed of the measuring head is 2.0 / sec. The generated noise is recorded by the acoustic sensor below the sample. TS750 is a value related to smoothness. When the blade pushed against the tissue paper product moves on the surface, the tissue paper product vibrates vertically like a film. If it is noisy, it is a tissue paper product with a rougher surface. If the noise is low, it is a tissue paper product with a smooth surface. The measured vibration waveform is FFT processed. The peak value of vibration generated at about 750 Hz is TS750. It can be said that the TS750 is the intensity of the maximum peak of the first spectrum from the low frequency side, which is automatically acquired by the software on the tissue softness analyzer. The smaller the value of TS750, the smoother the tissue paper product.

In the tissue paper product of the present embodiment, the thickness of the sheet is 0.70 mm / 10 ply or more and 1.30 mm / 10 ply or less. More preferably, the thickness of the sheet is 0.78 mm / 10 ply or more and 1.20 mm / 10 ply or less.

In the tissue paper product of the present embodiment, the water absorption degree is 0.8 seconds or more and 2.0 seconds or less. More preferably, the water absorption is 0.8 seconds or more and 1.7 seconds or less. The degree of water absorption is measured based on the old JIS S3104. In the tissue paper product of the present embodiment composed of 2 ly sheets, the water absorption is 23 ± 1 ° C. and the humidity is 50 ± 2% when 0.1 ml of purified water is dropped. The time (seconds) for water droplets to be absorbed by one sheet. The degree of water absorption is also called the degree of drip water absorption. If the tissue paper product is composed of a 1-ply sheet, the water absorption rate is 23 ± 1 ° C. and the humidity is 50 ± 2%, and 0.01 ml of purified water is dropped. The time (seconds) for water droplets to be absorbed by one sheet.

In the tissue paper product of the present embodiment, the length of the long side is 200 mm or more and 240 or less. The length of the short side is 196 mm or more and 236 mm or less.

In the tissue paper product of the present embodiment, the first vibration stimulation value (hereinafter referred to as _ISAI ) is 40 V / s or more and 100 V / s or less. _ISAI is a vibration stimulation value in the first region where the frequency is 1 Hz or more and 3 Hz or less. The second vibration stimulation value (hereinafter referred to as _IFAI ) is 20 V / s or more and 70 V / s or less. _IFAI is a vibration stimulation value in the second region where the frequency is larger than 3 Hz and 40 Hz or less. The third vibration stimulation value (hereinafter referred to as _IFAII ) is 70 V / s or more and 120 V / s or less. I _{FA II} is a vibration stimulus value in the third region where the frequency is larger than 40 Hz and 1000 Hz or less. I _{SAI, I FAI,} and I _faii are vibration characteristics, and a vibration stimulus value calculated based on the value of the minimum vibration detection threshold approximate line of Tissue paper products are measured by using a vibration measurement device 10 to be described later.

_{Specifically,} I _{SAI, I FAI,} and _{I faii} is calculated by the method described below. I _{SAI, I FAI,} and _{I faii} includes a vibration measuring step is calculated through the amplitude spectrum calculation step, a vibration stimulus value calculation step. The vibration measurement step is a step of measuring vibration information when the tissue paper product moves by using a vibration measuring device 10 including a contactor 535 sandwiching the tissue paper product and a sensor 539 for detecting vibration. The amplitude spectrum calculation step is a step of calculating the amplitude spectrum for each frequency based on the vibration information of the tissue paper product. Vibration stimulus value calculation step, based on the value of the amplitude spectrum and the lowest vibration detection threshold approximation _line, a step of calculating I _{SAI, I FAI,} and _{I faii.}

FIG. 1 is a schematic view of the vibration measuring device of the embodiment. FIG. 2 is a perspective view of the main body of the vibration measuring device and the linear motion mechanism. FIG. 3 is a diagram showing the performance of the linear motion mechanism. FIG. 4 is a perspective view of the fixing mechanism of the vibration measuring device. FIG. 5 is a perspective view of the fixing mechanism of the vibration measuring device in a state where the sanitary tissue paper is supported. FIG. 6 is a perspective view of the pinching mechanism of the vibration measuring device. FIG. 7 is a perspective view of the sensor unit of the pinching mechanism. FIG. 8 is an exploded perspective view of the sensor unit of the pinching mechanism. FIG. 9 is a side view of the contactor of the sensor unit. FIG. 10 is a diagram showing the performance of the sensor. FIG. 11 is a plan view of the middle plate of the sensor unit. FIG. 12 is a diagram showing a material for producing silicone rubber. FIG. 13 is a perspective view of a mold used for molding a contact. FIG. 14 is a perspective view of the mold with the middle plate fitted. FIG. 15 is a perspective view of the pinching unit of the pinching mechanism. FIG. 16 is an exploded perspective view of the pinching unit of the pinching mechanism. FIG. 17 is a schematic view for explaining the movement of the movable plate of the pinching mechanism. FIG. 18 is a schematic view for explaining the movement of the movable plate of the pinching mechanism. FIG. 19 is a graph showing a vibration waveform measured by a vibration measuring device.

I _SAI, when calculating the _{I FAI,} and _{I faii,} using vibration measurement device 10 First, the sample 100 (Tissue paper product of the present embodiment) vibration information when the move is measured (oscillation measurement step) .. As shown in FIG. 1, the vibration measuring device 10 includes a main body 20, a linear motion mechanism 30, a fixing mechanism 40, a pinching mechanism 50, a dynamic strain measuring device 11, and a position controller 13. In the vibration measuring device 10, the sandwiching mechanism 50 is moved by the linear motion mechanism 30 in a state where the sample 100 supported by the fixing mechanism 40 is sandwiched by the sandwiching mechanism 50. The vibration measuring device 10 can acquire the vibration generated in the sample 100 when the pinching mechanism 50 moves.

As shown in FIG. 1, the main body 20 is a substantially rectangular parallelepiped member having a recess on one surface. The main body 20 is arranged so that the longitudinal direction is along the vertical direction. The linear motion mechanism 30 is a device for linearly moving the pinching mechanism 50. The linear motion mechanism 30 moves the pinching mechanism 50 along the vertical direction. As shown in FIG. 2, the linear motion mechanism 30 is attached to the main body 20. The linear motion mechanism 30 has the performance shown in FIG. The linear motion mechanism 30 includes a motor 31, a ball screw 33, and a stage 35. The motor 31 is fixed to the main body 20. The motor 31 is, for example, a stepping motor. The ball screw 33 includes a screw shaft and a nut. The screw shaft of the ball screw 33 is rotated by the motor 31. When the screw shaft of the ball screw 33 rotates, the nut attached to the screw shaft moves in the axial direction. The stage 35 is fixed to the nut of the ball screw 33. Therefore, when the motor 31 is driven, the stage 35 moves.

The fixing mechanism 40 is a device for supporting the sample 100. As shown in FIG. 4, the fixing mechanism 40 is attached to the main body 20. The fixing mechanism 40 includes a base 41, a fixing bar 43, and a non-slip member 45. The base 41 is fixed to the main body 20. The fixing bar 43 is fixed to the base 41 by a fixing member. The fixing member is, for example, a screw. The base 41 and the fixing bar 43 are, for example, acrylic, and are formed by using an NC processing machine. The non-slip member 45 is attached to the fixing bar 43. The non-slip member 45 is fixed to the fixing bar 43 with, for example, an adhesive. The non-slip member 45 is arranged on the surface of the fixed bar 43 facing the base 41. The non-slip member 45 is, for example, rubber. As shown in FIG. 5, the sample 100 is arranged between the base 41 and the fixed bar 43. By tightening the fixing member, it is sandwiched between the base 41 and the non-slip member 45. As a result, the sample 100 is suspended by the fixing mechanism 40.

The sandwiching mechanism 50 is a device for sandwiching the sample 100 suspended by the fixing mechanism 40. As shown in FIG. 6, the pinching mechanism 50 includes a fixing plate 51, a movable plate 52, a sensor unit 53, a pinching unit 54, a guide rod 55, an elastic member 56, a string 57, a pulley 58, and the like. A weight 59 and a weight 59 are provided.

As shown in FIG. 6, the fixing plate 51 is fixed to the stage 35. The movable plate 52 is arranged in parallel with the fixed plate 51. A gap is provided between the fixed plate 51 and the movable plate 52. The guide rod 55 is fixed to the fixed plate 51 and penetrates the movable plate 52. The guide rod 55 supports the movable plate 52 via a bearing. That is, a bearing is provided in the hole of the movable plate 52 through which the guide rod 55 penetrates. The bearing is, for example, a slide bush (single type slide bush). Therefore, the movable plate 52 can move smoothly in the direction away from the fixed plate 51 or in the direction approaching the fixed plate 51. That is, the movable plate 52 can be translated with respect to the fixed plate 51.

As shown in FIG. 6, the sensor unit 53 is attached to the fixing plate 51. As shown in FIG. 7, the sensor unit 53 includes a base 531, two middle plates 533, a contactor 535, a diaphragm 537, and a sensor 539.

The base 531 is fixed to the fixing plate 51 as shown in FIG. The two middle plates 533 are fixed to each other, for example, by screws. The two middle plates 533 are fixed to the base 531 by screws, for example. The base 531 and the middle plate 533 are, for example, aluminum alloys, and are formed by using an NC processing machine. As shown in FIG. 11, the middle plate 533 includes a base portion 533a and a sandwiching portion 533b. The base 533a is substantially U-shaped. The sandwiching portion 533b is arranged inside the base portion 533a. A gap G is provided between the sandwiched portion 533b of one middle plate 533 and the sandwiched portion 533b of the other middle plate 533. The size of the gap G is preferably 0.05 mm or more and 0.15 mm or less. For example, in this embodiment, the size of the gap G is 0.1 mm. The two sandwiching portions 533b are arranged so as to draw a substantially H shape.

The contactor 535 is a member in contact with the sample 100. The contactor 535 is made of, for example, silicone rubber. The contactor 535 is integrated with the middle plate 533. As shown in FIG. 9, the contactor 535 includes a cylindrical portion 535a and a fixing portion 535b. The columnar portion 535a is a member on a semi-cylinder that is in contact with the sample 100. The fixing portion 535b is a substantially rectangular parallelepiped member in contact with the middle plate 533. The fixing portion 535b includes a plurality of holes 535c. The hole 535c is a hole into which the sandwiching portion 533b of the middle plate 533 fits. FIG. 9 is a view of the contactor 535 viewed from a horizontal direction parallel to the stage 35. The radius of curvature R1 shown in FIG. 9 is, for example, 6 mm. L1 shown in FIG. 9 is, for example, 12 mm. L2 shown in FIG. 9 is, for example, 42 mm. L3 shown in FIG. 9 is, for example, 2 mm. L14 shown in FIG. 9 is, for example, 3 mm. L5 shown in FIG. 9 is, for example, 2 mm. L6 shown in FIG. 9 is, for example, 1 mm.

The diaphragm 537 is a vibrating plate. The diaphragm 537 is made of, for example, phosphor bronze. A part of the diaphragm 537 is arranged inside the contactor 535. A part of the diaphragm 537 is arranged in the gap G shown in FIG. The thickness of the diaphragm 537 is preferably 0.05 mm or more and 0.20 mm or less. For example, in the present embodiment, the thickness of the diaphragm 537 is 0.1 mm. The sensor 539 detects the vibration generated in the diaphragm 537. The sensor 539 is, for example, a strain gauge. The sensor 539 has the performance shown in FIG. Sensors 539 are arranged on both sides of the diaphragm 537. The sensor 539 is fixed to the surface of the diaphragm 537 with, for example, an adhesive.

The contactor 535 is molded using the mold 19 shown in FIG. When molding the contactor 535, first, the main agent of the silicone rubber, the curing agent, and the thinner are mixed in the distribution shown in FIG. 12 to prepare a mixed liquid. Next, air bubbles in the mixture are removed using a vacuum defoaming device. Next, the mixed liquid is poured to about half of the mold 19 shown in FIG. Next, the middle plate 533 sandwiching the diaphragm 537 is installed in the mold 19 as shown in FIG. Next, the mixed solution is poured into the mold 19 until it reaches the upper surface of the middle plate 533. Next, the air bubbles in the mixture are removed again using the vacuum defoaming device. The reaction is then accelerated by placing the mold 19 in a high temperature dryer. When the silicone rubber has hardened, the contactor 535 is removed from the mold 19 together with the middle plate 533. In this way, the middle plate 533 and the contactor 535 are integrally formed.

As shown in FIG. 6, the sandwiching unit 54 is attached to the movable plate 52. As shown in FIG. 15, the sandwiching unit 54 includes a base 541, a middle plate 543, and a contactor 545. The sandwiching unit 54 does not include a sensor.

The base 541 is fixed to the movable plate 52 as shown in FIG. The middle plate 543 is fixed to the base 541 with screws, for example. The base 541 and the middle plate 543 are, for example, aluminum alloys, and are formed by using an NC processing machine.

The contactor 545 is a member in contact with the sample 100. The contactor 545 is made of, for example, silicone rubber. The contactor 545 is integrated with the middle plate 543. The contactor 545 has the same shape as the contactor 535 described above.

The elastic member 56 is arranged between the fixed plate 51 and the movable plate 52. The elastic member 56 is, for example, a coil spring. The guide rod 55 penetrates the elastic member 56. The elastic member 56 is provided to adjust the force applied to the sample 100 sandwiched between the contactor 535 and the contactor 545.

As shown in FIG. 6, the string 57 is bridged between the movable plate 52 and the fixed plate 51. The pulley 58 is fixed to the fixing plate 51. The string 57 is wound around the pulley 58 and extends downward in the vertical direction. The weight 59 is attached to the end of the string 57 and is suspended by the string 57.

The dynamic strain measuring device 11 shown in FIG. 1 is a device that captures the strain amount of the sensor 539 as an electric signal and displays it as a voltage value. The position controller 13 is a device for driving the linear motion mechanism 30.

An example of the vibration measurement step is shown below. In the vibration measurement step, when measuring the vibration information of the sample 100 (tissue paper product), the lead wire of the sensor 539 is first connected to the dynamic strain measuring device 11. Next, as shown in FIG. 5, the sample 100 is fixed to the fixing mechanism 40 so as to be suspended in the vertical direction. When fixing the sample 100 to the fixing mechanism 40, the position of the sample 100 is adjusted so that the crease in the center of the sample 100 does not come into contact with the contacts 535 and 545. Then, the elastic member 56 and the movable plate 52 are passed through the guide rod 55. After that, the weight 59 is attached to the tip of the string 57 attached to the movable plate 52. The string 57 is hung on the pulley 58. After that, the vibration measurement is started by driving the linear motion mechanism 30.

The sample 100 is sandwiched by the contactor 535 and the contactor 545 with a predetermined force. The predetermined force is preferably 0.05 N or more and 0.12 N or less. For example, in this embodiment, the predetermined force is 0.1N. In order to make the force applied to the sample 100 0.1 N, the characteristics of each member were set as follows, for example. The weight 59 is 0.05 kg. Since two weights 59 are provided, a total load of 0.1 kg acts on the movable plate 52. The spring constant of the elastic member 56 is 1.035 N / mm. The length of the elastic member 56 when the contactor 535 and the contactor 545 come into contact with each other is 30.4 mm. Under the above conditions, when the natural length of the elastic member 56 is 31.0 mm, the force applied to the sample 100 sandwiched between the contactor 535 and the contactor 545 is 0.1 N.

The stage 35 of the linear motion mechanism 30 moves at a predetermined speed. The predetermined speed is preferably 1 mm / sec or more and 8 mm / sec or less. For example, in this embodiment, the predetermined speed is 5 mm / sec. The stage 35 is moved for a predetermined time. The predetermined time is preferably 1 second or longer. For example, in this embodiment, the predetermined time is 3 seconds. The sampling frequency is 10 kHz. FIG. 19 is a graph showing vibration waveforms of 10 samples 100 measured by the vibration measuring device 10.

The vibration measuring device 10 does not necessarily have to have the above-described configuration. For example, the predetermined force for sandwiching the sample does not necessarily have to be adjusted by the weight 59 and the elastic member 56, but may be adjusted by another method. Further, the sandwiching unit 54 may be provided with a sensor or the like for detecting vibration, similarly to the sensor unit 53. Further, the sandwiching unit 54 may be fixed to the fixed plate 51, and the sensor unit 53 may be fixed to the movable plate 52.

The material of each configuration of the vibration measuring device 10 is not necessarily limited to the above-mentioned material. For example, the material of the contactor 535 and the contactor 545 is not limited to silicone rubber, and may be other materials. The material of the diaphragm 537 is not limited to phosphor bronze, and may be any other metal or a material other than metal.

After the vibration measurement step, the amplitude spectrum for each frequency is calculated based on the vibration information of the sample 100 (amplitude spectrum calculation step). An example of the amplitude spectrum calculation step is shown below. The amplitude spectrum is calculated by, for example, the Fourier transform.

Any periodic signal f (t) can be displayed as the sum of trigonometric functions. The periodic signal can be decomposed into the trigonometric functions that compose it by performing Fourier series expansion. This makes it possible to know the features such as the frequency or spectrum included in the periodic signal.

When Fourier series expansion is performed on an arbitrary periodic signal f (t), it is expressed as in Eq. (1). However, the Fourier coefficients _{a 0, a n, b} n, respectively formula (2), Equation (3), the formula (4).

The periodic signal f (t) is represented by a complex function as in Eq. (6) by using Euler's formula (5). However, the Fourier coefficients _{g n} can be expressed by equation (7).

Discrete Fourier Transform (DFT) is used to process digital signals. Equation (8) holds when the discrete signal f [n] is used. F [k] is called the frequency spectrum of f [n].

The F [k] obtained from the DFT calculation is generally a complex number. If the real part of F [k] is Re {F [k]]} and the imaginary part of F [k] is Im {F [k]]}, then equations (9), (10) and (11) ) Holds. | F [k] | is called an amplitude spectrum. argF [k] is called a phase spectrum.

The calculation of the amplitude spectrum and phase spectrum, it is necessary to calculate the N ² times. Fast Fourier transform (FFT) by breaking the DFT to a combination of two points DFT, since the number of calculations becomes Nlog ₂ N times can reduce the computation time.

For example, among the vibration information obtained in the vibration measurement step, the information for the first 1 second immediately after the linear motion mechanism 30 is driven is subjected to FFT processing using numerical analysis software. For example, the number of data points is 8192 points, and a humming window is used for the window function. FIG. 20 is a diagram showing the calculated amplitude spectrum. In FIG. 20, the vertical axis is an amplitude spectrum.

After amplitude spectrum calculation step, based on the value of the amplitude spectrum and the lowest vibration detection threshold approximation _line, I _{SAI, I FAI,} and _{I faii} is calculated (vibration stimulus value calculation step). The following is an example of the vibration stimulation value calculation step.

I _{SAI, I FAI,} and _{I faii} is calculated based on the value of the amplitude spectrum and the lowest vibration detection threshold approximation line. FIG. 21 is a diagram showing a vibration detection threshold curve. It is the mechanoreceptors that perceive the mechanical stimuli that are applied to the skin when a person touches an object. Mechanoreceptors play a major role in human tactile sensation. Mechanoreceptors include Mechanoreceptors, Pacinian corpuscles, Mercel tentacles and Rufini terminals. Mechanoreceptors are fast-adapted type I (FAI) and fast-adapted type II (FAII) because of the morphology of the receptive field, which is a combination of the mechanoreceptor and the nerve fibers connected to it, and the nature of the nerve firing characteristics to mechanical stimuli. , Slow adaptation type I (SAI) and slow adaptation type II (SAII). The size of the receptive field is as small as several mm in diameter for FAI and SAI. On the other hand, FAII and SAII are large and the boundaries are not clear. FAI also causes nerve firing for the velocity component of the applied stimulus. FAII causes nerve firing in response to the acceleration component of the applied stimulus. SAI and SAII cause nerve firing in response to displacement of the applied mechanical stimulus. Meissner corpuscles are classified as FAI. Pacinian corpuscles are classified as FAII. Mercel tactile discs are classified as SAI. The Rufini terminal is classified as SAII.

The magnitude of the mechanical stimulus applied to the receptive field causes the mechanoreceptor to ignite nerves. This gives the person a tactile sensation. There is a vibration detection threshold curve as information on the vibration threshold that can be detected by a person. As shown in FIG. 21, with respect to SAI, the detection threshold value does not change much even if the frequency is changed in the vicinity of 1 Hz or more and 100 Hz or less. Regarding FAI, the detection threshold is minimized at 10 Hz or more and 40 Hz or less. For FAII, the detection threshold is minimized at 100 Hz or more and 1000 Hz or less. The minimum vibration detection threshold approximation line is a line connecting the minimum vibration detection threshold values at each frequency. In FIG. 21, the minimum vibration detection threshold approximation line is indicated by a thick line. When a stimulus with an amplitude larger than the minimum vibration detection threshold curve is applied, one of the receptors is nerve-fired, and it is considered that a person perceives a tactile sensation. Further, the vibration detection threshold curve of SAII is omitted because the threshold value is higher than any other receptor in any frequency band and does not affect the minimum vibration detection threshold curve.

FIG. 22 is a diagram showing a minimum vibration detection threshold approximation line. The minimum vibration detection threshold curve shown in FIG. 21 can be represented by the minimum vibration detection threshold approximation line shown in FIG. The approximate expression of the minimum vibration detection threshold approximation line is defined by the equations (12), (13), (14) and (15).

However, since SAI is a displacement sensor, _{the value of L SAI} needs to be greater than 0 in all samples. At frequencies below 3 Hz, the value of _LSAI is determined to match the value of the sample that results in the smallest amplitude spectrum.

L _SAI , L _FAI , and L _FAII are vibration detection threshold approximation lines of SAI, FAI, and FAII, respectively. f is the frequency of the vibration stimulus. Further, L _{FAI, 40 Hz} and L _{FA II, 250 Hz} indicate a threshold value at 40 Hz and a threshold value at 250 Hz, respectively.

FIG. 23 is a diagram showing an amplitude spectrum and a minimum vibration detection threshold approximation line. FIG. 23 is a diagram showing a minimum vibration detection threshold approximation line and a log-log representation of the graph shown in FIG. 20. In FIG. 23, the portion exceeding the minimum vibration detection threshold approximation line is the vibration stimulation value. Vibration stimulus value _{Ii (I SAI, I FAI,} and _{I faii)} has the formula (16) is determined by equation (17) and (18).

_Pi is the amplitude spectrum of the i-th data in the periodogram. _Li is the i-th value of the lowest vibration detection threshold approximation line. f _l and f _h are the minimum value and the maximum value at the frequency of each frequency band. By dividing each receptive field indicating the minimum vibration detection threshold approximation _{line, I SAI,} I _FAI, and _{I faii} are calculated.

The measured amplitude spectrum for each frequency and the value of the minimum vibration detection threshold approximation line are substituted into equation (16). Using the value assignment is the formula (16) and equation (17), _I SAI to the total for each frequency _{domain, I FAI,} and _{I faii} are calculated. Figure 24 is a calculated _{I SAI,} a diagram showing the _{I FAI,} and _{I faii.} Since the one showing the minimum amplitude spectrum at a frequency of 3 Hz or less was at the time of measurement of the sixth sample, the value of const. In the formula (12) was set to 0.2272.

The tissue paper product of the present embodiment is stored in, for example, a paper carton or a poly film, and is used as a box tissue, a box-type soft pack, a pocket tissue, or the like. The packaging form of the tissue paper product of the present embodiment is not particularly limited, and any packaging form may be used.

A method for manufacturing the tissue paper product of the present embodiment will be described. The tissue paper product of the present embodiment is produced by processing the tissue paper base paper produced by using a paper machine. The papermaking speed at the time of papermaking by a paper machine is 800 m / min or more and 1600 m / min or less. More preferably, the extraction speed is 950 m / min or more and 1,500 m / min or less. Paper making speed is the speed at which paper is carried in a paper machine.

Examples of the former type of paper machine used for manufacturing tissue paper products include circular nets, gaps, crescents, and long nets. The former type of the paper machine is not particularly limited, but for example, a long net is preferable. The paper machine includes a head box and a wire (paper machine). The headbox ejects the raw material slurry onto the wire. The wire flattens and dehydrates the raw material slurry. The wire is run at a constant speed. The running speed of the wire is called the wire speed. When the speed at which the head box ejects the raw material slurry onto the wire is J and the wire speed of the paper machine is W, the J / W is 0.94 or more and 0.99 or less. More preferably, it is 0.95 or more and 0.98 or less.

In the tissue paper product of the present embodiment having the above-mentioned raw material composition and basis weight, when the J / W is less than 0.94, the vertical orientation of the fibers becomes stronger and the _{ISAI and IFAI} deviate from the desired range. At the same time, it becomes easy to tear due to the decrease in lateral strength. When J / W is higher than 0.99 (when J is in a region higher than the vicinity of the push-pull junction), the orientation of the pulp fibers is randomized and _{IFA II} is out of the desired range. For example, pulp fibers may pop out in the thickness direction (Z direction) of the paper. _{Incidentally,} I _{SAI, I FAI,} and _{the I faii} deviates from the desired range, the surface may be poor, and is expressed.

The tissue paper base paper produced by the paper machine is cut into a predetermined size in a state of being stacked 2 ply. As a result, a single sheet (tissue paper base paper having a predetermined size) is formed in a state in which 2 ply overlaps. After that, one set of sheets (sheets combined with 2 ply) are laminated so that they can be continuously taken out. A plurality of sets of laminated sheets are stored in a paper carton, a poly film, or the like. In this way, the tissue paper product of the present embodiment is manufactured.

Wet and dry paper strength agents may be used to adjust the strength of the tissue paper product. Further, the strength of the tissue paper product may be adjusted by using a double disc refiner (DDR) or the like.

Table 1 is a table showing the sensory evaluation for the example which is an example of the tissue paper product of this embodiment. Table 2 is a table showing the sensory evaluation for the comparative example. Sensory evaluation was performed on Examples and Comparative Examples. Specifically, a sensory evaluation was performed on the softness, smoothness, and resistance to tearing. The sensory evaluation was performed on 40 subjects. The softness, smoothness, and difficulty of tearing of each Example and each Comparative Example were evaluated by 40 people from 1 point to 5 points. In the columns of softness, smoothness, and tear resistance in Tables 1 and 2, "excellent" indicates that the average score of the evaluation of 40 people is 4.5 points or more, and "good" indicates that the average score is 4.5 points or more. "Yes" indicates that the average score is 2.5 points or more and less than 3.5 points, and "No" indicates that the average score is 2.5 points. Indicates that it is less than. A sensory evaluation of softness, smoothness, and resistance to tearing must all be "OK" or higher, which is a condition that a tissue paper product having good usability should meet.

Softness is the softness of a tissue paper product that you feel when using it (when you blow your nose). In the sensory evaluation of softness, 5 points are given for feeling particularly soft, 4 points are given for feeling soft, 3 points are given for feeling softness without problems, 2 points are given for feeling hard, and points are particularly hard when feeling hard. Was 1 point.

Smoothness is the smoothness of a tissue paper product that you feel when using it (when you blow your nose). In the sensory evaluation of smoothness, 5 points were given for feeling particularly smooth, 4 points were given for feeling smooth, and 3 points were given for feeling that there was no problem with smoothness, and the nose hurts due to lack of smoothness. 2 points were given, and 1 point was given especially when the nose was painful due to lack of smoothness.

Difficulty in tearing is the difficulty in tearing a tissue paper product during use (when wiping off a liquid or the like). In the sensory evaluation regarding the difficulty of tearing, 5 points are given for those who feel that they are particularly strong, 4 points are given for those who feel that they are strong, and 3 points are given for those who feel that they are hard to tear and can be used without problems. Two points were given when there was a problem and it was difficult to use, and one point was given when it was particularly easy to tear and difficult to use.

As shown in Table 1, in the first to ninth examples, which are examples of the tissue paper products of the present embodiment, the mass% of the hardwood bleached kraft pulp is 40% or more and 90% or less, and the softwood bleached kraft weight% of the pulp is 60% or less than 10%, the basis weight of the sheet of 1ply is at 13 g / ^{m 2} or more 19 g / ^{m 2} or _{less, I SAI} is less 40V / s or more 100 V / _{s, I FAI} Is 20 V / s or more and 70 V / s or less, and _{IFAI II} is 70 V / s or more and 120 V / s or less. In the first to ninth embodiments, the sensory evaluations of softness, smoothness, and resistance to tearing are all "OK" or higher. The first to ninth embodiments are tissue paper products having good usability.

As shown in Table 2, in the first comparative example, _ISAI is larger than 100 V / s (outside the range of 40 V / s or more and 100 V / s or less), and _IFAI is larger than 70 V / s (20 V / s). It is out of the range of 70 V / s or less), and _{IFAI II} is less than 70 V / s (outside the range of 70 V / s or more and 120 V / s or less). In the first comparative example, the sensory evaluation of smoothness and tear resistance is "impossible".

As shown in Table 2, in the second comparative example, _ISAI is less than 40 V / s (outside the range of 40 V / s or more and 100 V / s or less), and _IFAI is less than 20 V / s (20 V). (Outside the range of / s or more and 70 V / s or less), _{Ifa II} is larger than 120 V / s (outside the range of 70 V / s or more and 120 V / s or less). In the second comparative example, the sensory evaluation of softness is "impossible".

As shown in Table 2, in the third comparative example, _ISAI is larger than 100 V / s (outside the range of 40 V / s or more and 100 V / s or less), and _IFAI is larger than 70 V / s (20 V / s). s or more and 70 V / s or less), _{Ifa II} is less than 70 V / s (70 V / s or more and 120 V / s or less). In the third comparative example, the sensory evaluation of smoothness and tear resistance is "impossible".

As shown in Table 2, in the fourth comparative example, _ISAI is less than 40 V / s (outside the range of 40 V / s or more and 100 V / s or less), and _IFAI is less than 20 V / s (20 V). (Outside the range of / s or more and 70 V / s or less), _{Ifa II} is larger than 120 V / s (outside the range of 70 V / s or more and 120 V / s or less). In the fourth comparative example, the sensory evaluation of softness is "impossible".

As described above, in the tissue paper product of the present embodiment, 2 ply sheets are stacked. The mass% of hardwood bleached kraft pulp is 40% or more and 90% or less. The mass% of softwood bleached kraft pulp is 10% or more and 60% or less. The basis weight of the 1-ply sheet is 13 g / m ² or more and 19 g / m ² or less. Of the vibration stimulus values calculated based on the vibration characteristics of the tissue paper product measured using 10 vibration measuring devices and the value of the minimum vibration detection threshold approximation line, the first region in the first region where the frequency is 1 Hz or more and 3 Hz or less. 1 Vibration stimulation value ( _ISAI ) is 40 V / s or more and 100 V / s or less. _{Among the vibration stimulus values, the second vibration stimulus value (IFAI} ) in the second region where the frequency is larger than 3 Hz and 40 Hz or less is 20 V / s or more and 70 V / s or less. _{Among the vibration stimulus values, the third vibration stimulus value (IFAII} ) in the third region where the frequency is larger than 40 Hz and 1000 Hz or less is 70 V / s or more and 120 V / s or less.

By having the above-mentioned raw material composition and basis weight, the tissue paper product easily absorbs water and is hard to tear. Further, the first vibrating stimulus value _{(I SAI),} by the second vibrating stimulus values _{(I FAI)} and the third vibrating stimulus values _{(I faii)} is within the range described above, respectively, a is Zura tear and high water absorption A tissue paper product with a soft touch and a smooth surface is realized while maintaining the product. Therefore, the tissue paper product of the present embodiment has good water absorption and is hard to tear, and can improve softness and surface smoothness.

In the tissue paper product of the present embodiment, the dry vertical strength, which is the tensile strength in the vertical direction during drying, is 200 gf / 25 mm or more and 440 gf / 25 mm or less. The dry lateral strength, which is the lateral tensile strength at the time of drying, is 90 gf / 25 mm or more and 220 gf / 25 mm or less. The aspect ratio, which is the ratio of the dry longitudinal strength to the dry lateral strength, is 1.4 or more and 3.0 or less.

Thereby, the tissue paper product of the present embodiment can improve the level of sensory evaluation regarding the resistance to tearing, the softness of touch, and the smoothness of the surface.

In the tissue paper product of the present embodiment, the TS750, which is an index measured by the tissue softness analyzer, is 8.5 dBV ² rms or more and 13.5 dBV ² rms or less.

Thereby, the tissue paper product of the present embodiment can improve the level of sensory evaluation regarding the resistance to tearing, the softness of touch, and the smoothness of the surface.

In the tissue paper product of the present embodiment, the thickness of the sheet is 0.7 mm / 10 ply or more and 1.3 mm / 10 ply or less.

Thereby, the tissue paper product of the present embodiment has high water absorption and can improve the level of sensory evaluation regarding the resistance to tearing, the softness of touch and the smoothness of the surface.

In the tissue paper product of the present embodiment, the water absorption degree is 0.8 seconds or more and 2.0 seconds or less.

Thereby, the tissue paper product of the present embodiment has high water absorption and can improve the level of sensory evaluation regarding the resistance to tearing, the softness of touch and the smoothness of the surface.

In the tissue paper product of the present embodiment, the length of the long side is 200 mm or more and 240 or less. The length of the short side is 196 mm or more and 236 mm or less.

As a result, the tissue paper product of the present embodiment has a size that is easy to use when blowing the nose or wiping off liquid or the like, so that the usability can be improved.

In the method for producing the tissue paper product of the present embodiment, the mass% of the hardwood bleached kraft pulp is 40% or more and 90% or less, the mass% of the softwood bleached kraft pulp is 10% or more and 60% or less, and the sheet of 1 ly is used. This is a method for manufacturing a tissue paper product having a basis weight of 13 g / m ² or more and 19 g / m ^{2 or less.} The papermaking speed at the time of papermaking is 800 m / min or more and 1600 m / min or less. When the speed at which the raw material slurry is ejected onto the wire in the paper machine is J and the wire speed of the paper machine is W, the J / W is 0.94 or more and 0.99 or less.

The appropriate J / W range varies depending on the raw material composition and basis weight of the tissue paper product. When manufacturing a tissue paper product having the above-mentioned raw material composition and basis weight, the papermaking speed at the time of papermaking is 800 m / min or more and 1600 m / min or less, and the J / W is 0.94 or more and 0.99 or less. It is possible to realize a tissue paper product with a soft touch and a smooth surface while maintaining high water absorption and resistance to tearing.

10 Vibration measuring device 11 Dynamic strain measuring device 13 Position controller 19 type 20 Main body 30 Linear mechanism 31 Motor 33 Ball screw 35 Stage 40 Fixing mechanism 41 Base 43 Fixed bar 45 Anti-slip member 50 Pinching mechanism 51 Fixed plate 52 Movable plate 53 Sensor Unit 54 Holding unit 55 Guide rod 56 Elastic member 57 String 58 Pulley 59 Weight 531 Base 533 Middle plate 533a Base 533b Holding part 535 Contact 535a Column part 535b Fixing part 535c Hole 537 Vibration plate 538 Sensor 541 Base 543 Middle plate 545 Contact

Claims (7)

It is a tissue paper product that combines 2ply sheets.
The mass% of hardwood bleached kraft pulp is 40% or more and 90% or less.
The mass% of softwood bleached kraft pulp is 10% or more and 60% or less.
The basis weight of the 1-ply sheet is 13 g / m ² or more and 19 g / m ² or less.
Of the vibration stimulus values calculated based on the vibration characteristics of the tissue paper product measured using a vibration measuring device and the value of the minimum vibration detection threshold approximation line, the first region in the first region where the frequency is 1 Hz or more and 3 Hz or less. 1 Vibration stimulation value is 40 V / s or more and 100 V / s or less.
Among the vibration stimulation values, the second vibration stimulation value in the second region where the frequency is larger than 3 Hz and 40 Hz or less is 20 V / s or more and 70 V / s or less.
A tissue paper product in which the third vibration stimulus value in the third region having a frequency higher than 40 Hz and 1000 Hz or less among the vibration stimulus values is 70 V / s or more and 120 V / s or less. The dry vertical strength, which is the tensile strength in the vertical direction during drying, is 200 gf / 25 mm or more and 440 gf / 25 mm or less.
The dry lateral strength, which is the lateral tensile strength at the time of drying, is 90 gf / 25 mm or more and 220 gf / 25 mm or less.
The tissue paper product according to claim 1, wherein the aspect ratio, which is the ratio of the dry longitudinal strength to the dry lateral strength, is 1.4 or more and 3.0 or less. The tissue paper product according to claim 1 or 2, wherein the TS750, which is an index measured by the tissue softness analyzer, is 8.5 dBV ² rms or more and 13.5 dBV ^{2 rms or less.} The tissue paper product according to any one of claims 1 to 3, wherein the thickness of the sheet is 0.7 mm / 10 ply or more and 1.3 mm / 10 ply or less. The tissue paper product according to any one of claims 1 to 4, wherein the water absorption degree is 0.8 seconds or more and 2.0 seconds or less. The length of the long side is 200 mm or more and 240 or less.
The tissue paper product according to any one of claims 1 to 5, wherein the length of the short side is 196 mm or more and 236 mm or less. The mass% of hardwood bleached kraft pulp is 40% or more and 90% or less, the mass% of softwood bleached kraft pulp is 10% or more and 60% or less, and the basis weight of 1 ly sheet is 13 g / m ² or more and 19 g / m. It is a manufacturing method of tissue paper products of ^{2 or less.}
The papermaking speed at the time of papermaking is 800 m / min or more and 1600 m / min or less.
A method for producing a tissue paper product in which J / W is 0.94 or more and 0.99 or less when the speed at which the raw material slurry is ejected onto the wire in the paper machine is J and the wire speed of the paper machine is W.

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