JP7147915B2 - toilet paper and toilet roll - Google Patents

Description

The present invention relates to toilet paper and toilet rolls.

A toilet paper product is manufactured by cutting into a predetermined size a toilet paper made by stacking one or more toilet paper webs. In general, a toilet roll (rolled toilet paper) is often used, which is obtained by winding a long toilet paper into a roll. Toilet paper consisting of a single toilet paper web is referred to as one-ply toilet paper, and toilet paper consisting of two-ply toilet paper webs is referred to as two-ply toilet paper.

Since toilet paper comes into direct contact with the skin, it is required to have a smooth and fluffy texture. In addition, since toilet paper is distributed in a roll form and is displayed in stores, there are cases where the toilet roll itself is required to have a touch feeling or a soft feel. That is, there is a tendency that a toilet roll that feels soft and fluffy to the touch when picked up is considered to be of high quality and high quality. For this reason, it is being studied to improve the touch and feel of the toilet roll by adjusting the winding density of the toilet roll (for example, Patent Documents 1 and 2).

Japanese Patent No. 3619808 Japanese Patent No. 3992943

However, in conventional toilet rolls, the smooth and fluffy texture of toilet paper that is unwound from the roll and used, and the touch and soft touch of the toilet roll itself are not compatible at a high level. Improvement was required.

Therefore, in order to solve such problems of the prior art, the present inventors provide a toilet paper that has a good feeling of touch and can exhibit an excellent feeling of touch when rolled. We proceeded with the study with the aim of

As a result of intensive studies to solve the above problems, the present inventors formed embossments with different heights on the outer roll toilet paper and the inner roll toilet paper, respectively, and set the difference in emboss height to a predetermined value. It has been found that by setting the amount within the range, it is possible to obtain a toilet paper having a good feeling of touch, and a toilet paper capable of exhibiting an excellent feeling of touch when formed into a roll form.
Specifically, the present invention has the following configurations.

[1] Two or more ply toilet paper having an outer roll toilet paper and an inner roll toilet paper, wherein the embossed height of the outer roll toilet paper is 90 μm or more and 210 μm or less, and the embossed height of the inner roll toilet paper is is 70 μm or more and 170 μm or less, and the difference between the embossed height of the outer side toilet paper and the embossed height of the inner side toilet paper is 10 μm or more and 50 μm or less.
[2] The compression recovery rate (RC ₁ ) of the outer roll toilet paper is 33% or more and 53% or less, the compression recovery rate (RC ₂ ) of the inner roll toilet paper is 35% or more and 55% or less, and (RC ₁ -RC ₂ ) is -12% or more and -1% or less.
[3] The toilet paper according to [1] or [2], wherein the embossed pattern of the outer roll toilet paper and the embossed pattern of the inner roll toilet paper are different.
[4] The embossing density of the toilet paper outside the roll is 10 pieces/cm ² or more and 30 pieces/cm ² or less, and the embossing density of the toilet paper inside the roll is 20 pieces/cm ² or more and 100 pieces/cm ² or less [1 ] The toilet paper according to any one of [3] [5] A toilet roll obtained by rolling the toilet paper according to any one of [1] to [4], wherein the roll length of the toilet roll is 25 m A two-ply or more toilet roll having a length of 60 m or more and a winding density of 0.50 m/cm ² or more and 1.4 m/cm ² or less.
[6] (A) step of embossing the toilet paper on the outside of the winding with an embossing height of 90 μm or more and 210 μm or less, and performing embossing of the toilet paper on the inside of the winding with an embossing height of 70 μm or more and 170 μm or less (B). and a step of laminating the unwinding toilet paper obtained in the step (A) and the unwinding toilet paper obtained in the step (B), wherein the unwinding toilet paper obtained in the step (A). and the embossed height of the inner roll toilet paper obtained in the step (B) is 10 μm or more and 50 μm or less.

Effect of the Invention According to the present invention, it is possible to obtain a toilet paper that has a good feeling of touch and can exhibit an excellent feeling of touch even when it is rolled. A toilet roll composed of the toilet paper of the present invention has a soft feel and can give a favorable impression of luxury and high quality.

FIG. 1 is a schematic diagram illustrating the configuration of the toilet paper of the present invention. FIG. 2 is a pattern diagram for explaining the embossed pattern A. FIG. 3A and 3B are pattern diagrams for explaining the embossed pattern B. FIG. FIG. 4 is a diagram illustrating a method of calculating the winding density of the toilet roll.

The present invention will be described in detail below. Although the constituent elements described below may be described based on representative embodiments and specific examples, the present invention is not limited to such embodiments.

(Toilet Paper)
TECHNICAL FIELD The present invention relates to a two-ply or more toilet paper having an outer winding toilet paper and an inner winding toilet paper. Here, the embossing height of the roll-side toilet paper is 90 μm or more and 210 μm or less. The embossing height of the roll-side toilet paper is 70 μm or more and 170 μm or less. Moreover, the difference between the embossed height of the outer roll toilet paper and the embossed height of the inner roll toilet paper is 10 μm or more and 50 μm or less.

Since the toilet paper of the present invention has the above structure, it is excellent in texture during use. Specifically, the toilet paper of the present invention has a smooth and fluffy texture. Furthermore, the toilet paper of the present invention can exhibit an excellent feeling of touch even in the form of a roll. That is, the toilet roll made of the toilet paper of the present invention is soft and has excellent touch feeling.

The toilet paper of the present invention is a two or more ply toilet paper. The number of plies of toilet paper refers to the number of overlapping toilet paper webs. The number of plies may be 2 or more, preferably 2 or more and 4 or less, more preferably 2 or 3, and particularly preferably 2.

In the present invention, the toilet paper is preferably toilet paper that constitutes a toilet roll. That is, the toilet paper of the present invention has an outer roll toilet paper and an inner roll toilet paper. The roll-outside toilet paper is toilet paper arranged on the outer peripheral surface side of the roll when the toilet paper is wound into a roll. In addition, the inner side toilet paper is a surface arranged on the inner peripheral surface side of the roll when the toilet paper is wound into a roll.
FIG. 1 is a diagram for explaining the configuration of the toilet paper of the present invention. FIG. 1 shows a toilet roll and an enlarged view of a dotted circle portion of toilet paper constituting the toilet roll. As shown in FIG. 1, the toilet paper 1 has an outer roll toilet paper 12 on the outer peripheral surface side of the toilet roll 100, and an inner roll toilet paper 14 on the inner peripheral surface side of the toilet roll 100. is doing. When the toilet paper is three-ply or more, the toilet paper arranged on the outermost side is called the outermost toilet paper, and the toilet paper arranged on the innermost side is called the inner side toilet paper. It says.

The embossing height of the roll-side toilet paper is 90 μm or more and 210 μm or less. The embossing height of the roll-side toilet paper is preferably 100 μm or more, more preferably 130 μm or more, and even more preferably 190 μm or more. The embossing height of the roll-side toilet paper is preferably 210 μm or less, more preferably 200 μm or less. In the present invention, by setting the embossing height of the roll-out side toilet paper within the above range, it is possible to enhance the feeling of touch during use.

The embossing height of the roll-side toilet paper is 70 μm or more and 170 μm or less. The embossing height of the inner side toilet paper is preferably 75 μm or more, more preferably 90 μm or more, even more preferably 110 μm or more, and particularly preferably 150 μm or more. Further, the embossed height of the roll-side toilet paper is preferably 170 μm or less, more preferably 160 μm or less.

The difference between the embossed height of the outer roll toilet paper and the embossed height of the inner roll toilet paper is 10 μm or more and 50 μm or less. The difference in emboss height is preferably 12 μm or more, more preferably 19 μm or more, still more preferably 20 μm or more, even more preferably 30 μm or more, and particularly preferably 42 μm or more. preferable. Also, the difference in emboss height is preferably 50 μm or less.
In the present invention, the embossed height of the outer roll toilet paper and the embossed height of the inner roll toilet paper are set within the above range, and the difference between the embossed height of the outer roll toilet paper and the embossed height of the inner roll toilet paper is set to the above range. By setting it within the range, it was possible to achieve both the smooth and fluffy texture of the toilet paper and the good feel of the toilet roll.
Such an effect is considered to be obtained by forming embossments with different heights on each toilet paper so that the toilet papers are stacked at appropriate intervals when the toilet roll is constructed. That is, it is thought that a soft toilet roll with excellent compressibility can be obtained because an appropriate gap is generated between the laminated toilet paper sheets.

When measuring the embossed height of each toilet paper, first, using a high-precision shape measuring system KS-1100 (manufactured by KEYENCE), the height of the surface (inner surface) of the outer roll toilet paper and the inner roll toilet paper get the data. The acquisition range is 1 cm square, and the image acquisition pitch is 10 μm. Next, the acquired image data is read into image analysis software IOMate 2007 (manufactured by I-Spec Co., Ltd.), and the obtained height data is classified into 256 gradations. After removing the data of the defective portion such as the hole, a graph is created in which the horizontal axis represents the gradation and the vertical axis represents the number of data. For the created graph, the moving average is taken at a total of 5 points, 2 points before and after, and the graph is redrawn. Calculated using the value. A moving average is obtained from the obtained tilt data at a total of seven points (three points before and after), and another graph is created with the horizontal axis as the gradation and the vertical axis as the tilt after obtaining the moving average. The position of the first inflection point in the portion after the lowest point of the obtained gradient graph is determined visually, and the gradation of the horizontal axis at that position is determined as the threshold value. Next, the weighted average of the height data of the portion below the defined threshold value is performed, and the obtained average value is defined as the “average height of the non-embossed portion”. In addition, the weighted average of the height data is also performed for the portions equal to or higher than the predetermined threshold value, and the obtained average value is defined as the “average height of the embossed portion”. The embossed height is defined as the value determined by "average height of embossed portion" - "average height of non-embossed portion", and is calculated for each ply.

The basis weight of the toilet paper is preferably 10 g/m ² or more, more preferably 12 g/m ² or more, and even more preferably 15 g/m ² or more. Generally, the upper limit of the basis weight of toilet paper is about 25 g/m ² . The basis weight of toilet paper in the specification of the present application represents the basis weight of one sheet of two-ply toilet paper. Both the outer roll toilet paper and the inner roll toilet paper are preferably within the above ranges.

The thickness of each of the roll-outside toilet paper and the roll-inside toilet paper is preferably 50 μm or more, more preferably 60 μm or more, and even more preferably 70 μm or more. Moreover, it is preferable that the thickness of each toilet paper is 100 μm or less. Both the outer roll toilet paper and the inner roll toilet paper are preferably within the above ranges.
In the present invention, by setting the basis weight and thickness of the toilet paper within the above ranges, it is possible to exhibit a smooth texture and a fluffy feel while maintaining practical strength.

When _T0 is the thickness when a pressure of 0.5 gf/cm ² is applied to each of the outer roll toilet paper and the inner roll toilet paper, _T0 of the outer roll toilet paper is 0.20 mm or more. Preferably, it is 0.45 mm or less.
In addition, _T0 of the roll-side toilet paper is preferably 0.10 mm or more, and preferably 0.40 mm or less.

Furthermore, the difference between T ₀ of the outer roll toilet paper and T ₀ of the inner roll toilet paper is preferably greater than 0.01 mm, more preferably 0.02 mm or more, and preferably 0.03 mm or more. More preferably, it is particularly preferably 0.04 mm or more. The toilet paper of the present invention is also characterized in that there is a large difference between _T0 of the toilet paper on the outside of the roll and _T0 of the toilet paper on the inside of the roll. It is considered that such a difference in _T0 also contributes to achieving both the smooth and fluffy texture of the toilet paper and the good feel of the toilet roll.

When T _m is the thickness of the toilet paper of the present invention when a pressure of 50 gf/cm ² is applied, the T _m of each of the outer roll toilet paper and the inner roll toilet paper is preferably 0.05 mm or more. , 0.10 mm or more. In addition, it is preferable that _Tm of each of the outer roll toilet paper and the inner roll toilet paper is 0.30 mm or less.

Here, the values of T ₀ and T _m described above can be measured using a KES FB3-AUTO-A automatic compression tester (manufactured by Kato Tech Co., Ltd.). Specifically, a sample cut to a size of 10 cm × 20 cm was placed between a 2 cm ² pressure plate and a pressure receiving plate of a KES FB3-AUTO-A automated compression tester, and the pressure plate was measured at a speed of 50 seconds / mm. is lowered, and the pressure that changes at that time and the thickness of the sample at that time are measured. T ₀ is the thickness (mm) of the sample at a pressure of 0.5 gf/cm ² and T _m is the thickness (mm) of the sample at a pressure of 50 gf/cm ² . The values of T ₀ and T _m are measured 10 times with the concave surface of the embossing (the surface pressed against the embossing roll) as the pressure plate side, and abnormal values are excluded from the obtained measurement data by the method of Hampel identifier, and the average It is a value calculated as a value. Note that the above samples are measured in an environment conforming to ISO187 (temperature 23±1° C., relative humidity 50±2%).

Also, the compression hardness (LC), compression energy (WC), and compression recovery rate (RC) can be calculated using a KES FB3-AUTO-A automated compression tester (manufactured by Kato Tech Co., Ltd.). Compression hardness (LC) represents the linear proportionality of the repulsive force to the depth of indentation. Compression energy (WC) represents the energy required for compression, and the greater the value, the easier the compression. Also, the compression recovery rate (RC) indicates the recoverability when returning from a compressed state, and the closer it is to 100%, the higher the recoverability.

The compression hardness (LC) of the roll-side toilet paper is preferably 0.40 or more and 0.80 or less. The compression hardness (LC) of the inner side toilet paper is preferably 0.30 or more and 0.70 or less. The difference between the compression hardness (LC) of the outer roll toilet paper and the compression hardness (LC) of the inner roll toilet paper is preferably 0.02 or more, more preferably 0.03 or more, and 0.04. It is more preferable that it is above.

The compression energy (WC) of the outer roll toilet paper is preferably 0.10 gf·cm/cm ² or more and 0.50 gf·cm/cm ² or less. The compression energy (WC) of the inner side toilet paper is preferably 0.10 gf·cm/cm ² or more and 0.40 gf·cm/cm ² or less. The difference between the compression energy (WC) of the outer roll toilet paper and the compression energy (WC) of the inner roll toilet paper is preferably 0.02 gf·cm/cm ² or more, more preferably 0.03 gf·cm/cm ² or more. is more preferably 0.05 gf·cm/cm ² or more.

The compression recovery rate (RC ₁ ) of the roll-side toilet paper is preferably 33% or more and 53% or less. The compression recovery rate (RC ₂ ) of the inner roll toilet paper is preferably 35% or more and 55% or less. The difference (RC ₁ −RC ₂ ) between the compression recovery rate (RC ₁ ) of the outer roll toilet paper and the compression recovery rate (RC ₂ ) of the inner roll toilet paper is more than −12% and −1% or less. preferable.

The average of the hand feel value (HF value) of the exposed side surface of the toilet paper outside the roll of the toilet paper of the present invention and the hand feel value of the exposed side surface of the inside roll toilet paper is preferably 75.0 or more. 0.0 or more is more preferable. Although the upper limit of the HF value is not particularly limited, it is generally preferably 95.0 or less.

Here, the hand feel value (HF value) can be measured by the following measuring method using a tissue softness analyzer (manufactured by Emtec Electronic GmbH).
First, a sample cut into a circle with a diameter of 112.8 mm is placed on the sample table of the tissue softness analyzer. A bladed rotor is pushed into the sample from above with a pushing pressure of 100 mN. After that, the bladed rotor is rotated at a rotation speed of 2.0 rpm, and the vibration frequency at that time is measured.
In addition, for another sample cut into a circle with a diameter of 112.8 mm, the amount of deformation displacement in the vertical direction when the bladed rotor is pushed in with pressures of 100 mN and 60 mN is calculated. The HF value is a value calculated from the vibration frequency and the amount of deformation displacement, and TP II can be used for the calculation algorithm.
When calculating the HF value, the exposed surface of the outer roll toilet paper and the exposed surface of the inner roll toilet paper are measured 10 times each, and abnormal values are excluded from the obtained measurement data by the Hampel identifier method. . Then, the average HF value of the toilet paper is calculated from the average HF value of each surface.
Note that the above samples are measured in an environment conforming to ISO187 (temperature 23±1° C., relative humidity 50±2%). Also, when measuring, calibrate with a standard sample (emetec ref. 2X (nn.n)) according to the attached instructions, and set the algorithm to TP II. As calculation software, emetec measurement system ver. 3.22 is used.

The longitudinal tensile strength of each of the outer roll toilet paper and the inner roll toilet paper is preferably 0.90 N/15 mm or more, more preferably 1.00 N/15 mm or more. In addition, the tensile strength in the longitudinal direction of each toilet paper is preferably 1.60 N/15 mm or less, more preferably 1.55 N/15 mm or less.
The tensile strength in the width direction of each toilet paper is preferably 0.20 N/15 mm or more, more preferably 0.30 N/15 mm or more. The tensile strength in the width direction of each toilet paper is preferably 0.70 N/15 mm or less, more preferably 0.60 N/15 mm or less, and even more preferably 0.50 N/15 mm or less.
In addition, it is preferable that both the outer roll toilet paper and the inner roll toilet paper are within the above ranges.

The tensile strength of each toilet paper can be measured using a horizontal tensile tester (manufactured by Kumagai Riki Co., Ltd.). In this case, a sample with a width of 15 mm is used, and the measurement is performed under the conditions of a pulling speed of 50 mm/min. The tensile strength in this specification is the tensile strength of 1-ply toilet paper, and is the average value of 6 samples. The tensile strength is measured in an environment conforming to ISO187 (temperature 23±1° C., relative humidity 50±2%).

In the present invention, it is preferable that the embossed pattern of the outer roll toilet paper and the embossed pattern of the inner roll toilet paper are different.
In the embossed pattern of the roll-side toilet paper, the diameter of one emboss is preferably 0.5 mm or more and 2 mm or less, more preferably 0.7 mm or more and 1.3 mm or more. The emboss density is preferably 10/cm ² or more and 30/cm ² or less, more preferably 15/cm ² or more and 25/cm ² or less.
In the embossed pattern of the inner roll toilet paper, the diameter of one emboss is preferably 0.2 mm or more and 1.0 mm or less, more preferably 0.3 mm or more and 0.6 mm or less. The emboss density is preferably 20/cm ² or more and 100/cm ² or less, more preferably 40/cm ² or more and 80/cm ² or less.
The difference in emboss diameter between the outer roll toilet paper and the inner roll toilet paper is preferably 0.2 mm or more, more preferably 0.4 mm or more.

Examples of the embossed pattern of the roll-outside toilet paper include the embossed pattern shown in FIG. 2, for example. Further, examples of the embossed pattern of the inner roll toilet paper include the embossed pattern shown in FIG. 3, for example.

(fiber raw material)
The toilet paper of the present invention is obtained by papermaking a slurry containing a fibrous raw material. Pulp is preferably used as the fiber raw material. Pulp includes wood pulp, non-wood pulp, and deinked pulp. Examples of wood pulp include hardwood pulp (hardwood kraft pulp (LKP)), softwood pulp (softwood kraft pulp (NKP)), sulfite pulp (SP), dissolving pulp (DP), soda pulp (AP), and unbleached kraft pulp. Pulp (UKP), chemical pulp such as oxygen-bleached kraft pulp (OKP), and the like. Semi-chemical pulp (SCP), semi-chemical pulp such as chemi-groundwood pulp (CGP), groundwood pulp (GP), mechanical pulp such as thermomechanical pulp (TMP, BCTMP) and the like are also included, but are not particularly limited. Examples of non-wood pulp include, but are not limited to, cotton pulp such as cotton linters and cotton lint, non-wood pulp such as hemp, straw, and bagasse, and cellulose, chitin, and chitosan isolated from sea squirts, seaweed, and the like. . The deinked pulp includes deinked pulp made from waste paper, but is not particularly limited. The pulp may be used alone or in combination of two or more.

As the fiber raw material, it is preferable to use at least one kind selected from softwood pulp and hardwood pulp, and it is preferable to use softwood pulp. Among them, in the present invention, softwood pulp and hardwood pulp are preferably used in combination, and softwood kraft pulp (NKP) and hardwood kraft pulp (LKP) are more preferably used in combination.

When softwood pulp is used as the fiber raw material, the content of the softwood pulp is preferably 20% by mass or more, more preferably 30% by mass or more, relative to the total mass of the pulp components contained in the toilet paper. More preferably, it is 40% by mass or more. Also, the content of the softwood pulp is preferably 80% by mass or less with respect to the total mass of the pulp components contained in the toilet paper. By setting the content of the softwood pulp within the above range, it becomes easy to set the HF value, compressibility, etc. of the toilet paper within the desired range.

It is preferable to use a combination of softwood pulp and hardwood pulp as the fiber raw material. That is, the toilet paper preferably further contains hardwood pulp in addition to softwood pulp. The hardwood pulp content is preferably 10% by mass or more, more preferably 20% by mass or more, and more preferably 30% by mass or more, relative to the total mass of the pulp components contained in the toilet paper. More preferred. Moreover, the content of the hardwood pulp is preferably 70% by mass or less with respect to the total mass of the pulp components contained in the toilet paper. By setting the content of the hardwood pulp within the above range, it becomes easy to set the HF value, compressibility, etc. of the toilet paper within the desired range.

The length-weighted average fiber length of the softwood pulp used as the fiber raw material is preferably 1.6 mm or more, more preferably 1.8 mm or more, and even more preferably 2.0 mm or more. In addition, the weighted average fiber length of the softwood pulp is preferably 2.5 mm or less.
The length-weighted average fiber length of the hardwood pulp used as the fiber raw material is preferably 0.5 mm or longer, more preferably 0.6 mm or longer, and even more preferably 0.65 mm or longer. Further, the weighted average fiber length of hardwood pulp is preferably 1.0 mm or less.
By setting the length-weighted average fiber length of the fiber raw material within the above range, it becomes easy to set the HF value, compressibility, etc. of the toilet paper within the desired range. The length-weighted average fiber length of the fiber raw material is the fiber length as the raw material, which is the fiber length before beating treatment or the like.

The freeness represented by the Canadian Freeness Standard (CFS) of the fibrous component (pulp component) contained in the toilet paper is preferably 400 ml or more, more preferably 450 ml or more, and 500 ml. It is more preferable that it is above. Also, the freeness is preferably 700 ml or less. By setting the freeness of the fiber component within the above range, it becomes easy to set the HF value, compressibility, etc. of the toilet paper within the desired range, and a toilet paper having both a smooth texture and a fluffy feel can be obtained. be done. The freeness of the fiber component can be adjusted by controlling the beating conditions, as will be described later.

(Optional component)
The toilet paper of the present invention may contain optional components in addition to the fiber raw material. Examples of optional components include dry paper strength agents, wet paper strength agents, and softening agents. Examples of dry paper strength agents include cationized starch, polyacrylamide (PAM), carboxymethylcellulose (CMC) and the like. Examples of wet paper strength agents include polyamide epichlorohydrin, urea, melamine, and thermally crosslinkable polyacrylamide. Examples of softening agents include anionic surfactants, nonionic surfactants, and cationic surfactants. The above optional components may be used singly or in combination of two or more.

When the toilet paper contains a dry paper strength agent, the content of the dry paper strength agent is 0.01 parts by mass or more and 0.50 parts by mass with respect to 100 parts by mass of the fiber component contained in the toilet paper. The following are preferable.
When the toilet paper contains a wet paper strength agent, the content of the wet paper strength agent is 0.001 parts by mass or more and 0.10 parts by mass with respect to 100 parts by mass of the fiber component contained in the toilet paper The following are preferable.
In addition, when the toilet paper contains a softening agent, the content of the softening agent is 0.01 parts by mass or more and 0.50 parts by mass or less with respect to 100 parts by mass of the fiber component contained in the toilet paper. Preferably.

(Toilet paper manufacturing method)
The method for producing the toilet paper of the present invention includes a step of making a slurry containing a fiber raw material to obtain a one-ply toilet paper web, and a step of laminating the one-ply toilet paper web (hereinafter also referred to as a lamination step). , embossing the outer roll toilet paper web and the inner roll toilet paper web, and relaminating the outer roll toilet paper and the inner roll toilet paper.

A step of bleaching the fibrous raw material may be included before the step of obtaining the one-ply toilet paper web. The bleaching agent used in the bleaching step includes known bleaching agents such as oxygen bleaching agents and chlorine bleaching agents.

Obtaining a one-ply toilet paper web includes obtaining a slurry comprising a fibrous raw material. The step of obtaining the slurry preferably includes a step of beating the fiber raw material. In the beating step, for example, a double disc refiner or the like can be used for beating treatment. At this time, the softwood pulp and hardwood pulp may be beaten individually, or may be beaten after being mixed.

The step of obtaining a one-ply toilet paper web includes the step of papermaking a slurry containing fibrous raw materials. Examples of paper machines used in the papermaking process include suction breast formers (cylinder type, fourdrinier type), twin wire formers, cylinder formers (C wrap, S wrap), crescent formers, and the like. can be mentioned.

In the papermaking process, a slurry containing a fiber raw material is supplied onto a mesh wire to form a thin layer of pulp. The pulp lamina is then dewatered by draining the moisture in the pulp lamina under the screen while being transported towards the press part. Such a process is sometimes called a dehydration process. Typically, the wire is a loop of metal or plastic mesh.

In the papermaking step, for example, a pulp slurry in which softwood pulp and hardwood pulp are mixed is made into paper to form a wet paper as one uniform layer, or a softwood pulp layer and a hardwood pulp layer are combined to form one sheet. However, any method may be adopted.

After the dewatering process, the wet paper is transferred from the wire to the felt. The wet paper web is further mechanically dewatered by applying pressure with press rolls through the felt. This is sometimes called a pressing process or a water squeezing process.

It is preferable that the papermaking step further includes a drying step after the water squeezing step. The drying step is preferably, for example, a step of blowing hot air toward the wet paper or a step of pressing a dryer cylinder against the outer peripheral surface.

In the papermaking step, it is preferable to provide a crepe-applying step after the drying step. The crepe can be imparted by colliding the base paper with a doctor blade and compressing it in the direction of paper flow. A predetermined crepe ratio can be obtained by providing a speed difference between the take-up reel and the dryer cylinder.

A base paper winding step may be provided after the creping step. In the base paper winding step, a one-ply base paper winding is obtained by winding the toilet paper web (thin paper) finished through the above steps. At this time, it is preferable to wind the toilet paper web (thin paper) so that the surface of the toilet paper web (thin paper) pressed against the dryer cylinder becomes the outer peripheral surface of the base paper winding.

The step of laminating a one-ply toilet paper web includes a step of unwinding two rolls of base paper through a ply machine and laminating two sheets of base paper. A step of calendering may be provided after bonding.

The step of applying embossing includes (A) step of embossing the toilet paper on the outer side of the roll with an embossed height of 90 μm or more and 210 μm or less, and embossing the toilet paper on the inner side of the roll with an embossed height of 90 μm or more and 170 μm or less. (B) step of applying. The difference between the embossed height of the roll-side toilet paper obtained in the step (A) and the embossed height of the roll-side toilet paper obtained in the step (B) is 10 μm or more and 50 μm or less.

Embossing is performed by passing the toilet paper web between an embossing roll on which convex structures forming the embossed pattern are placed and a rubber roll to emboss the embossed pattern. An embossed shape having an embossed height within the above range can be formed by changing the embossing height of the embossing roll, the pressing amount, and the pressing pressure.
Here, it is preferable that the embossing roll used for embossing the roll-side toilet paper is provided with a convex structure having a height of 0.75 mm or more and 0.85 mm or less. The embossing roll used for embossing the roll-side toilet paper is preferably provided with convex structures having a convex structure density (embossing density) of 10/cm ² or more and 30/cm ² or less. In the embossing of the roll-side toilet paper, the embossing roll is preferably embossed with a pressure of 8 kgf/cm ² or more and 20 kgf/cm ² or less.
Moreover, it is preferable that the embossing roll used for embossing the inner side toilet paper is provided with a convex structure having a height of 0.70 mm or more and 0.80 mm or less. Moreover, it is preferable that the embossing roll used for embossing the inner side toilet paper is provided with convex structures having a convex structure density (embossing density) of 50/cm ² or more and 70/cm ² or less. In the embossing of the roll inner side toilet paper, the embossing roll is preferably embossed with a pressure of 5 gf/cm ² or more and 15 kgf/cm ² or less.

After the embossing step, a step of laminating the outer side toilet paper and the inner side toilet paper again is included. In this case, it is preferable to perform bonding so that the convex surfaces of the embossing (the surface opposite to the surface pressed by the embossing roll) face each other inside.

In the bonding step, two or more one-ply toilet paper webs are laminated and bonded together. In this step, for example, after stacking the base papers, they can be pasted together by applying a narrow contact emboss to the edge portion of the product. At that time, it is preferable from the viewpoint of the feel to touch that the surface pressed by the embossing roll faces outward.

A winding process is further provided after the bonding process. In this winding process, winding is performed for a predetermined length so as to satisfy a predetermined product length. Then, the obtained winding roll is cut to a predetermined width.
The winding process can be carried out as follows using, for example, a winder having a mandrel shaft. (1) First, a paper tube, which serves as a winding core, is inserted into the mandrel shaft and fixed. (2) Adhesive is applied to the paper tube, and the leading edge of the toilet paper is adhered and fixed to the paper tube. (3) By rotating the mandrel shaft, the 2-ply toilet paper is wound around the core tube by the length of the product.

(toilet roll)
The present invention also relates to a toilet roll obtained by rolling the toilet paper described above. Since the toilet roll of the present invention is made of the toilet paper described above, it has an excellent feel to the touch. Excellent touch feeling means that the toilet roll is soft and has excellent compressibility when gripped.

The winding length of the toilet roll of the present invention is preferably 25 m or more and 60 m or less. Here, the winding length of the toilet roll is the winding length in units of two sheets of toilet paper in the case of a two-ply toilet roll.

The winding diameter (outer diameter) of the toilet roll of the present invention is preferably 110 mm or more and 120 mm or less. Here, the winding diameter (outer diameter) of the toilet roll is represented by R in FIG.

Moreover, the toilet roll of the present invention is made by winding toilet paper around a paper tube. The paper tube diameter is preferably 30 mm or more and 40 mm or less. The paper tube diameter of the toilet roll is represented by S in FIG.

The winding density of the toilet roll of the present invention is preferably 0.16 m/cm ² or more, more preferably 0.20 m/cm ² or more, and even more preferably 0.30 m/cm ² or more. 0.60 or more is particularly preferable. The winding density of the toilet roll is preferably 1.40 m/cm ² or less, more preferably 1.08 m/cm ² or less, and even more preferably 0.99 m/cm ² or less. More preferably, it is 0.80 m/cm ² or less.
Above all, the toilet roll with a winding length of 25 m preferably has a winding density of 0.60 m/cm ² or more and 0.68 m/cm ² or less. It is preferably 73 m/cm ² or ^more and 0.82 ^m /cm ² or less. For toilet rolls with a height of 60 m, the winding density is preferably 1.25 g/m ² or more and 1.45 g/m ² or less.

The winding density of the toilet roll is obtained by dividing twice the winding length of the two-ply toilet roll by the cross-sectional area of the roll excluding the cross-sectional area of the paper tube (P (dot pattern portion) in FIG. 4). It is a value calculated by That is, the winding density can be calculated by the following formula.
Winding density (m/cm ² ) = winding length x 2/roll cross-sectional area

EXAMPLES The characteristics of the present invention will be described more specifically below with reference to examples and comparative examples. The materials, amounts used, proportions, treatment details, treatment procedures, etc. shown in the following examples can be changed as appropriate without departing from the gist of the present invention. Therefore, the scope of the present invention should not be construed to be limited by the specific examples shown below.

(Example 1)
A pulp slurry was prepared so that hardwood kraft pulp (hereinafter “LBKP”) was 70% by mass and softwood kraft pulp (hereinafter “NBKP”) was 30% by mass in the pulp component (100% by mass). Furthermore, to the pulp slurry, 0.1% by mass of a softening agent (manufactured by Seiko PMC Co., Ltd.) (relative to the pulp component mass) and 0.01% by mass of cationized starch (manufactured by Oji Constarch Co., Ltd.) are added. did. The pulp slurry thus prepared was made into paper using a twin wire Yankee machine to obtain a toilet paper web.

Two rolls of the base paper thus obtained were put on a ply machine, and laminated to two plies while being unwound. After lamination, it was calendered at a linear pressure of 7 kg/cm ² and wound up again to obtain a 2-ply toilet paper web.

The resulting 2-ply roll of toilet paper web was placed in a processing machine, and the surface of the toilet paper web was embossed while being unwound. In the embossing process, the embossments were formed by passing the toilet paper web between a steel embossing roll and a rubber roll on which convex structures forming the embossed pattern were placed, and stamping the embossed pattern.
In the embossing process, different embossed patterns were formed on the roll-outside toilet paper and the roll-inside toilet paper. An embossing roll having an emboss pattern A with a convex structure height of 0.80 mm and a convex structure density (embossing density) of 21.2/cm ² was applied to the roll-side toilet paper at a pressure of 14 kgf/cm ² to form embossments. . In addition, embossing was formed on the roll-side toilet paper by pressing an embossing roll having an embossing pattern B with a convex structure height of 0.75 mm and a convex structure density (embossing density) of 60/cm ² at a pressure of 12 kgf/cm ² . .
After the embossing process, the convex surfaces of the embossed surfaces of the outer roll toilet paper and the inner roll toilet paper face each other on the inner side, and contact embossing is formed so as to protrude from the inner roll toilet paper to the outer roll toilet paper side, forming two plies. I did the gluing. Thereafter, perforations for breaking across the width direction were formed at regular intervals along the longitudinal direction to obtain a roll-shaped toilet roll having the winding length shown in Table 1. Table 1 shows the winding diameter (R in FIG. 4) of the obtained toilet roll. The obtained toilet roll was cut into a predetermined width to obtain a two-ply toilet roll (toilet roll product).

(Example 2)
Example except that the pressure for embossing the embossed pattern was 11 kgf/cm ^{2 for the toilet paper on the outside of the roll and 9 kgf/cm 2 for} the toilet paper on the inside of the roll, and the basis weight and the winding length were changed as shown in Table 2. A 2-ply toilet roll was obtained in the same manner as in 1.

(Comparative example 1)
An embossed pattern A having a convex structure height of 0.8 mm and a convex structure density (embossing density) of 21.2 pieces/cm ² was pressed and embossed on both the outer roll toilet paper and the inner roll toilet paper at a pressure of 14 kgf/cm ² . A two-ply toilet roll was obtained in the same manner as in Example 1, except that the was formed.

(Comparative example 2)
An embossing pattern B having a convex structure height of 0.75 mm and a convex structure density (embossing density) of 60/cm ² is pressed at a pressure of 9 kgf/cm ² on both the outer roll toilet paper and the inner roll toilet paper to form embossments. A two-ply toilet roll was obtained in the same manner as in Example 1, except that the basis weight was changed as shown in Table 1.

(Comparative Example 3)
An embossing pattern A having a convex structure height of 0.75 mm and a convex structure density (embossing density) of 60/cm ² is pressed at a pressure of 11 kgf/cm ² on both the outer roll toilet paper and the inner roll toilet paper to form embossments. A two-ply toilet roll was obtained in the same manner as in Example 1, except that the basis weight and winding length were changed as shown in Table 2.

(evaluation)
(Emboss height)
First, using a high-precision shape measuring system KS-1100 (manufactured by KEYENCE), height data of the surface (inner surface) of the outer roll toilet paper and the inner roll toilet paper was obtained. The acquisition range was 1 cm square, and the image acquisition pitch was 10 μm. Next, the obtained image data was read into image analysis software IOMate 2007 (manufactured by I-Spec Co., Ltd.), and the obtained height data was classified into 256 gradations. After removing the data of defective portions such as holes, a graph was created in which the horizontal axis represents the gradation and the vertical axis represents the number of data. For the created graph, the moving average is taken at a total of 5 points, 2 points before and after, and the graph is redrawn. calculated using the A moving average was taken at a total of 7 points (three points before and after) for the obtained data of the slope, and another graph was created with the horizontal axis as the gradation and the vertical axis as the slope after obtaining the moving average. The position of the first inflection point in the portion after the lowest point of the obtained gradient graph was determined visually, and the gradation of the horizontal axis at that position was determined as the threshold value. Then, the weighted average of the height data of the portion below the defined threshold was performed, and the obtained average value was defined as the "average height of the non-embossed portion". In addition, the weighted average of the height data is also performed for the portions equal to or higher than the predetermined threshold value, and the obtained average value is defined as the “average height of the embossed portion”. The embossed height was defined as the value determined by "average height of embossed portion" - "average height of non-embossed portion", and was calculated for each ply.

(basis weight)
Basis weight measurements refer to one-ply toilet paper measurements. Basis weight was measured in accordance with JIS P 8124.

(paper thickness)
Thickness measurements refer to measurements of 1-ply toilet paper. The thickness was measured using a thickness gauge (manufactured by Hybridge Manufacturing Co., Ltd.) in an environment conforming to ISO 187 when the probe was lowered at a speed of 1 mm or less per second. For the measurement, 10 sheets of 1-ply toilet paper were measured one by one, and the thickness of the obtained 10 sheets was averaged to obtain the paper thickness.

(HF value)
The HF value of the toilet paper was measured using a tissue softness analyzer (manufactured by Emtec Electronic GmbH). A sample cut into a circle with a diameter of 112.8 mm was placed on a sample table, and a rotor with blades was pressed into the sample from above by applying a pressing pressure of 100 mN. After that, the bladed rotor was rotated at a rotation speed of 2.0 rpm, and the vibration frequency at that time was measured. In addition, the amount of deformation displacement in the vertical direction was calculated when the rotor with blades was pushed in with a pressure of 100 mN and 60 mN for another sample cut into a circle with a diameter of 112.8 mm. The HF value is a value calculated from the vibration frequency and the amount of deformation displacement, and TP II was used as the calculation algorithm. The above measurements were performed 10 times on the exposed surface of the outer roll toilet paper and the exposed surface of the inner roll toilet paper of each sample, and abnormal values were excluded from the obtained measurement data by the method of Hampel identifier. , the average value was calculated for each surface. Further, from the average HF value of each surface thus calculated, the average HF value of both surfaces was calculated and used for evaluation as the HF value.
The above samples were measured in an environment conforming to ISO187 (temperature 23±1° C., relative humidity 50±2%). Moreover, at the time of measurement, calibration was performed with a standard sample (emetec ref. 2X (nn.n)) according to the attached instructions, and the algorithm was set to TPII. The calculation software is emtec measurement system Ver. 3.22 was used.

(compressibility)
The compressibility of the toilet paper was measured using a KES FB3-AUTO-A automated compression tester (manufactured by Kato Tech Co., Ltd.). A 10 cm long x 20 cm wide sample was placed between a ^{2 cm2} pressure plate and a pressure receiving plate, and the pressure plate was lowered at a speed of 50 mm/sec. By measuring the thickness of, the following items were calculated.
T ₀ : thickness of sample under pressure of 0.5 gf/cm ² T _m : thickness of sample under pressure of 50 gf/cm ² LC: compression linearity WC: compression work
RC: thickness recovery
The values of the above items are obtained by measuring the toilet paper on the outside of the roll and the toilet paper on the inside of the roll, and measuring 10 times with the concave surface of the embossing (the surface pressed against the embossing roll) as the pressure plate side. This is a value calculated as an average value after excluding abnormal values by the method of Hampel identifier. The above samples were measured in an environment conforming to ISO187 (temperature 23±1° C., relative humidity 50±2%).

(tensile strength)
Tensile strength measurements are for 1-ply toilet paper and represent dry tensile strength. Tensile strength was measured according to JIS P 8113. Tensile strength in the machine direction and tensile strength in the transverse direction were measured for each of six samples, and the average value was calculated as the tensile strength.

(winding density)
The winding density of the two-ply toilet roll was calculated. The winding density is calculated by dividing twice the winding length of the two-ply toilet roll by the cross-sectional area of the roll excluding the cross-sectional area of the paper tube (P (dot pattern portion) in FIG. 4). did. That is, the winding density can be calculated by the following formula.
Winding density (m/cm ² ) = winding length x 2/roll cross-sectional area

(sensory evaluation)
The texture and the softness of the roll were evaluated by 10 evaluators on a 3-grade scale. The feel of the skin was evaluated by applying the toilet paper, which had been unwound and separated from the roll by about 40 cm, to the skin and evaluated the softness.
As for the softness of the roll, the softness when the roll was gripped by hand was evaluated. In addition, the softness was compared between toilet rolls having the same winding length. The evaluation results were expressed in three stages of ◯, △, and × when the winding length was 25 m, and in three stages of ABC when the winding length was 45 m.
<Feeling of touch>
○ or A: Excellent △ or B: Slightly inferior × or C: Inferior <Softness of roll>
○ or A: Soft △ or B: Slightly hard × or C: Hard

The toilet papers obtained in the examples have an excellent texture, and form a toilet roll with an excellent texture.

1 Toilet paper 12 Outside toilet paper 14 Inside toilet paper 100 Toilet roll P Roll cross-sectional area R Roll winding diameter S Paper tube diameter

Claims (8)

A two-ply toilet paper having an outer roll toilet paper and an inner roll toilet paper,
The value obtained by subtracting the thickness of the roll-side toilet paper under a pressure of 50 gf/cm ² from the thickness of the roll-side toilet paper under a pressure of 0.5 gf/cm ² is 0.172 mm or more and 0.271 mm or less,
A value obtained by subtracting the thickness of the inner-winding toilet paper under a pressure of 50 gf/cm ² from the thickness of the inner-winding toilet paper under a pressure of 0.5 gf/cm ² is 0.137 mm or more and 0.189 mm or less,
The difference between the thickness of the outer roll toilet paper under a pressure of 0.5 gf/cm ² and the thickness of the inner roll toilet paper under a pressure of 0.5 gf/cm ² is 0.03 mm or more,
The embossed height of the roll-side toilet paper is 130 μm or more and 210 μm or less, and the roll-side toilet paper has an emboss height of 110 μm or more and 170 μm or less,
A two-ply toilet paper, wherein the difference between the embossed height of the outer roll toilet paper and the embossed height of the inner roll toilet paper is 10 μm or more and 50 μm or less. 2. The difference between the thickness of the roll-side toilet paper under a pressure of 0.5 gf/ cm ² and the thickness of the roll-side toilet paper under a pressure of 0.5 gf/cm ² is 0.038 mm or more and 0.077 mm or less . The toilet paper described in . The compression recovery rate (RC ₁ ) of the outer roll toilet paper is 33% or more and 53% or less, the compression recovery rate (RC ₂ ) of the inner roll toilet paper is 35% or more and 55% or less, and (RC ₁ - The toilet paper according to claim 1 or 2, wherein the value of RC ₂ ) is -12% or more and -1% or less. The toilet paper according to any one of claims 1 to 3, wherein the embossed pattern of the outer roll toilet paper and the embossed pattern of the inner roll toilet paper are different. The emboss density of the roll-outside toilet paper is 10 pcs/cm ² or more and 30 pcs/cm ² or less,
The toilet paper according to any one of Claims 1 to 4, wherein the inner side toilet paper has an emboss density of 20/cm ² or more and 100/cm ² or less. A toilet roll made by rolling the toilet paper according to any one of claims 1 to 5,
The winding length of the toilet roll is 25 m or more and 60 m or less,
A two-ply toilet roll having a winding density of 0.50 m/cm ² or more and 1.4 m/cm ² or less. (A) step of embossing the toilet paper on the outer side of the roll with an embossed height of 130 μm or more and 210 μm or less, and embossing the toilet paper on the inner side of the roll with an embossed height of 110 μm or more and 170 μm or less;
A step of laminating the outer roll toilet paper obtained in the step (A) and the inner roll toilet paper obtained in the step (B),
The difference between the embossed height of the outer roll toilet paper obtained in the step (A) and the embossed height of the inner roll toilet paper obtained in the step (B) is 10 μm or more and 50 μm or less,
The value obtained by subtracting the thickness of the outer roll-side toilet paper under a pressure of 50 gf/cm ² from the thickness of the outer roll-side toilet paper obtained in the step (A) under a pressure of 0.5 gf/cm ² is 0.172 mm or more. .271 mm or less,
The value obtained by subtracting the thickness of the inner-winding toilet paper under a pressure of 50 gf/cm ² from the thickness of the inner-winding toilet paper obtained in the step (B) under a pressure of 0.5 gf/cm ² is 0.137 mm or more and 0.189 mm or less,
Two-ply toilet paper, wherein the difference between the thickness of the outer roll toilet paper under a pressure of 0.5 gf/cm ² and the thickness of the inner roll toilet paper under a pressure of 0.5 gf/cm ² is 0.03 mm or more. manufacturing method. The thickness of the outer roll toilet paper obtained in the step (A) under a pressure of 0.5 gf/cm ² and the thickness of the inner roll toilet paper obtained in the step (B) under a pressure of 0.5 gf/cm ² The method for producing a two-ply toilet paper according to claim 7, wherein the difference between is 0.038 mm or more and 0.077 mm or less .

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