JP6795117B2 - Toilet rolls and manufacturing methods for toilet rolls - Google Patents

Description

The present invention relates to a toilet roll and a method for manufacturing a toilet roll.

Toilet paper products are manufactured by cutting toilet paper into a predetermined size by stacking one or two or more toilet paper webs. Generally, a toilet roll (roll-shaped toilet paper) in which a long toilet paper is wound in a roll shape is often used. Toilet paper made up of one toilet paper web is called 1-ply toilet paper, and toilet paper made up of two layers of toilet paper web is called 2-ply toilet paper.

Toilet paper, for example, packaged in units of 12 rolls or 16 rolls, is widely distributed. However, since these packages are bulky, the amount that can be carried is limited. In addition, storage space for toilet rolls tends to be insufficient in public facilities. For this reason, the use of roll products with a longer winding length by adjusting the thickness of the toilet paper constituting the toilet roll and increasing the winding force when winding into a roll is also advancing (for example, patents). Documents 1 and 2).

Patent Document 1 describes a sanitary tissue paper roll in which a laminate of two sheets of sanitary tissue paper is wound into a roll, and the basis weight per sheet of the sanitary tissue paper exceeds 13 g / m ² and is 17 g / m ^2. Disclosed is a sanitary tissue paper roll having a paper thickness of more than 0.6 mm / 10 sheets and 1.1 mm / 10 sheets or less, a roll length of 74 to 93 m, and a roll diameter of 100 to 130 mm. Has been done. Here, it is considered to improve the texture and usability without reducing the basis weight.
Further, Patent Document 2 describes a toilet paper roll in which a 2-ply long toilet paper is wound into a roll shape, and the basis weight of the sheet constituting each ply is 10 to 14 g / m ² . The difference in elongation in the longitudinal direction of each sheet is 2 to 10%, and each sheet is integrated by contact embossing formed on the widthwise end of the toilet paper, has a diameter of 100 to 120 mm, and has a winding length. Toilet paper rolls that are 60-90 m are disclosed.

Japanese Unexamined Patent Publication No. 2014-188342 Japanese Unexamined Patent Publication No. 2013-208297

In the conventional toilet roll with a long winding length, it is necessary to increase the strength of the toilet paper in order to tightly wind the toilet paper in order to lengthen the winding length. However, in toilet paper that can withstand wrapping, while the strength is increased, the softness and touch of the toilet paper itself tend to deteriorate. In particular, there is a problem that the feel of the toilet paper as a whole deteriorates due to the roughness and lack of thickness of the front and back surfaces of the toilet paper.

Further, in the 2-ply toilet roll, contact embossing may be applied to the end portion in the width direction in order to prevent peeling between the plies. However, when contact embossing is applied, paper tearing may occur if the winding force is increased, and defects in the manufacturing process are observed.

Therefore, in order to solve the problems of the prior art, the present inventors have constructed a toilet paper having a good feel to the touch and which does not break when wound in a roll shape. We proceeded with the study for the purpose of providing toilet rolls to be used.

As a result of diligent studies to solve the above problems, the present inventors set the basis weight of the toilet paper constituting the toilet roll within a predetermined range in the toilet roll of 2 plies or more, and the basis weight of the toilet paper is 2 plies or more. By adjusting the thickness of the toilet paper when a pressure of 50 gf / cm ² is applied to a predetermined range, and by forming embossing substantially uniformly in the width direction of the toilet paper and integrating it into two plies, the winding length can be increased. It has been found that even in toilet paper that constitutes a long toilet roll, it is possible to suppress the rough feeling on the front and back surfaces and increase the thickness feeling. Furthermore, the present inventors have found that in such a toilet roll, peeling between plies is suppressed and does not break at the time of winding, and have completed the present invention.
Specifically, the present invention has the following configuration.

[1] A roll-shaped toilet roll made by winding toilet paper of 2 plies or more, the length of the toilet roll is 48 m or more and 75 m or less, the winding diameter is 110 mm or more and 120 mm or less, and 1 of the toilet paper. The basis weight per ply is 10 g / m ² or more and 16 g / m ² or less, and the thickness when pressure of 50 gf / cm ² is applied to toilet paper of 2 plies or more is 180 μm or more and 270 μm or less, and 2 plies or more. Toilet paper is a toilet roll that is integrated by embossing that is formed substantially uniformly in the width direction.
[2] The toilet roll according to [1], wherein the thickness of the toilet paper when a pressure of 0.5 gf / cm ² is applied is 320 μm or more and 520 μm or less.
[3] The toilet roll according to [1] or [2], wherein the difference in embossing density between adjacent regions is 10% or less when the toilet paper having two or more plies is divided into three in the width direction.
[4] The toilet roll according to any one of [1] to [3], wherein the average hand feel value of the front surface and the back surface of the toilet paper having 2 plies or more is 70.0 or more.
[5] Includes a step of embossing the toilet paper of 2 plies or more in a laminated state substantially uniformly in the width direction, and a step of winding the toilet paper of 2 plies or more that has been embossed into a roll shape. A method for manufacturing toilet rolls, the length of the toilet roll is 48 m or more and 75 m or less, the winding diameter is 110 mm or more and 120 mm or less, and the basis weight per ply of toilet paper is 10 g / m ² or more and 16 g / m. ^A method for producing a toilet roll having a thickness of 180 μm or more and 270 μm or less when a pressure of 50 gf / cm ² is applied to toilet paper having ² or less and 2 plies or more.
[6] The method for manufacturing a toilet roll according to [5], wherein the step of embossing is provided only once in all the steps of the method for manufacturing a toilet roll.

According to the present invention, a toilet roll having a long winding length can be made of toilet paper having a good feel to the touch. Specifically, it is possible to form a toilet roll having a long roll length from toilet paper that does not have a rough feeling on the front and back surfaces and gives a feeling of thickness.
Further, according to the present invention, it is possible to obtain a 2-ply toilet roll in which peeling between plies is suppressed. Further, in the present invention, it is suppressed that the toilet paper is broken at the time of winding when forming a toilet roll having a long winding length.

FIG. 1 is a schematic view illustrating the configuration of the toilet roll of the present invention. FIG. 2 is a schematic view illustrating the configuration of the toilet roll of the present invention. FIG. 3 is a cross-sectional view for explaining the thickness of the 2-ply toilet paper.

Hereinafter, the present invention will be described in detail. The description of the constituent elements described below may be based on typical embodiments or specific examples, but the present invention is not limited to such embodiments.

(Toilet roll)
The present invention relates to a toilet roll in which two or more plies of toilet paper are wound into a roll shape. Here, the winding length of the toilet roll of the present invention is 48 m or more and 75 m or less, and the winding diameter is 110 mm or more and 120 mm or less. Further, the basis weight per ply of the toilet paper constituting the toilet roll of the present invention is 10 g / m ² or more and 16 g / m ² or less. The thickness of the toilet paper having 2 plies or more when a pressure of 50 gf / cm ² is applied is 180 μm or more and 270 μm or less. The toilet paper having two or more plies constituting the toilet roll of the present invention is integrated by embossing formed substantially uniformly in the width direction.

Since the toilet roll of the present invention has the above-mentioned structure, it is made of toilet paper having a good feel to the touch even though it is a toilet roll having a long winding length. Specifically, the toilet paper constituting the toilet roll of the present invention does not have a rough feeling on the front and back surfaces, and a sufficient sense of thickness can be felt. Further, since the toilet roll of the present invention has the above-mentioned structure, peeling between plies is suppressed. Further, in the present invention, it is suppressed that the toilet paper is broken at the time of winding when forming a toilet roll having a long winding length.

The toilet roll of the present invention also has an advantage that unevenness due to contact embossing after being rolled is not generated. In the conventional toilet roll having contact embossing, when the roll shape is formed, the contact embossed portions are continuously laminated, so that the portion may be raised from the outer shape of the roll shape. That is, an uneven shape derived from contact embossing was formed in the width direction of the roll. Such a roll shape deteriorates the appearance and may impair the sense of quality. In the present invention, since it is integrated by embossing formed substantially uniformly in the width direction, such an uneven shape is not formed. Therefore, it looks good when rolled.

The toilet roll of the present invention is composed of toilet paper having two or more plies. The number of toilet paper plies means the number of layers of toilet paper web. 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.

FIG. 1 is a schematic view illustrating the configuration of the toilet paper of the present invention. FIG. 1 illustrates a toilet roll 100 composed of 2-ply toilet paper 20. In the toilet roll 100, of the two-ply toilet paper 20, the toilet paper 20a arranged on the outside of the roll is referred to as the front side toilet paper 20a, and the toilet paper 20b arranged on the inside of the roll is referred to as the back side toilet paper 20b. The exposed surface of the front side toilet paper 20a is referred to as the front surface, and the exposed surface of the back surface side toilet paper 20b is referred to as the back surface.

The winding length (winding length) of the toilet roll of the present invention is 48 m or more and 75 m or less. A toilet roll having such a winding length is sometimes called a so-called long-winding toilet roll. It may also be referred to as a double-roll toilet roll or a triple-roll toilet roll. Here, the winding length of the toilet roll is a winding length of two sheets in which two sheets of toilet paper are stacked 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 of the toilet roll is the length represented by R in FIG. By setting the winding diameter of the toilet roll within the above range, the toilet roll can be installed in any toilet roll holder, and the usage situation is not restricted.

The basis weight per ply of the toilet paper constituting the toilet roll of the present invention is 10 g / m ² or more and 16 g / m ² or less. The basis weight per ply toilet paper may be any 10 g / ^{m 2} or more, preferably 10.5 g / ^{m 2} or more, more preferably 11g / ^{m 2} or more, 11.4 g / It is more preferably m ² or more. The basis weight of 1 ply per toilet paper, as long 16g / ^{m 2} or less, is preferably 15 g / ^{m 2} or less, more preferably 14 g / ^{m 2} or less, 13 g / ^{m 2} The following is more preferable. It is preferable that both the front side toilet paper 20a and the back side toilet paper 20b are within the above range.
In the present invention, by setting the basis weight per ply of toilet paper within the above range, it becomes easy to manufacture a toilet roll having a desired winding diameter. Normally, when manufacturing a toilet roll having a long winding length, the winding diameter is controlled by increasing the winding force when winding the toilet roll into a roll shape. However, in the present invention, it is possible to manufacture a toilet roll having a desired winding diameter without increasing the winding tightening force when winding into a roll to the strength in the conventional method. As a result, it is possible to prevent the toilet paper from breaking during winding.

The thickness ( _Tm ) when a pressure of 50 gf / cm ² is applied to the toilet paper having two or more plies constituting the toilet roll of the present invention is 180 μm or more and 270 μm or less. The thickness (T _m ) may be 180 μm or more, preferably 185 μm or more, more preferably 190 μm or more, and further preferably 195 μm or more. The thickness (T _m ) may be 270 μm or less, preferably 260 μm or less, more preferably 250 μm or less, and even more preferably 240 μm or less. By setting the thickness (T _m ) within the above range, the thickness of the toilet paper can be firmly felt, and the usability can be enhanced. In addition, the toilet paper can be made into a toilet paper having an excellent feel.

Further, the thickness (T ₀ ) when a pressure of 0.5 gf / cm ² is applied to the toilet paper of 2 plies or more constituting the toilet roll of the present invention is preferably 320 μm or more, and preferably 340 μm or more. It is more preferably 360 μm or more, and particularly preferably 380 μm or more. The thickness (T ₀ ) is preferably 520 μm or less, more preferably 500 μm or less, further preferably 480 μm or less, and particularly preferably 450 μm or less. By setting the thickness (T ₀ ) within the above range, the feel of the toilet paper can be enhanced.

Here, the above-mentioned thickness (T ₀ ) and thickness (T _m ) values can be measured using a KES FB3-AUTO-A automated compression tester (manufactured by Kato Tech Co., Ltd.). Specifically, a sample cut to a size of 10 cm × 20 cm was placed between the 2 cm ² pressure plate and the pressure receiving plate of the KES FB3-AUTO-A automated compression tester, and the pressure plate was placed 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 sample thickness (mm) in the pressure 0.5gf / cm ^2, _{T m} is the sample thickness pressure at 50 gf / cm ² (mm). The values of T ₀ and T _m were measured 10 times with the concave surface of the emboss (the surface on which the emboss roll was pressed) as the pressure plate side, and the abnormal values were excluded from the obtained measurement data by the method of the Hampel identifier and averaged. It is a value calculated as a value. The sample is measured in an environment compliant with ISO187 (temperature 23 ± 1 ° C., relative humidity 50 ± 2%).

The toilet paper having two or more plies constituting the toilet roll of the present invention is integrated by embossing formed substantially uniformly in the width direction. Here, when embossing is formed substantially uniformly in the width direction, embossing having a substantially uniform density in the width direction is observed in a region having a length of ± 0.5 cm (length 1 cm) from an arbitrary point in the length direction. Will be done. Further, in the present invention, it is preferable that the embossing is formed substantially uniformly in the length direction as well. That is, it is preferable that the embossing is formed substantially uniformly over the entire area of the toilet paper. In the toilet roll shown in FIG. 1, the state of embossing applied to the rolled toilet paper is shown by black dots. As can be seen from the state of embossing of the toilet paper in FIG. 1, in the present invention, embossing is formed substantially uniformly over the entire area of the toilet paper.

Here, when the toilet paper having two or more plies is divided into three in the width direction, the difference in embossing density between adjacent regions is preferably 10% or less. Specifically, a region having a length of ± 0.5 cm (length 1 cm) is cut out as a sample from an arbitrary point in the length direction, and this sample is divided into three in the width direction. In this case, it is divided into a first region, a second region, and a third region in order from the edge. In the present invention, the difference in embossing density between the first region and the second region is preferably 10% or less, and the difference in embossing density between the second region and the third region is also preferably 10% or less. The difference in embossing density between the first region and the third region is also preferably 10% or less.

In the embossing pattern of toilet paper, the embossing diameter of one piece is preferably 0.5 mm or more and 2 mm or less, and more preferably 0.7 mm or more and 1.3 mm or less. The embossing density is preferably 10 pieces / cm ² or more and 30 pieces / cm ² or less, and more preferably 15 pieces / cm ² or more and 25 pieces / cm ² or less.

The embossing as described above is formed by embossing the entire area of the two-ply toilet paper in a state of being overlapped. In the specification of the present application, such an embossing method is referred to as single embossing. In addition, single embossing is double embossing in which each ply of 2-ply toilet paper is embossed, or edge in which 2-ply toilet paper is superposed and embossed at the end in the width direction. It is distinct from embossing. The two-ply toilet paper constituting the toilet roll of the present invention is integrated by single embossing.

Here, the state in which the two-ply toilet paper is integrated means that the end of the toilet paper on the front side of the toilet paper is held by a finger and wound until the toilet paper on the front side comes upward of the toilet roll. , The state in which the toilet paper on the back side is wound following the toilet paper on the front side. In this case, the back side toilet paper may be separated from the front side toilet paper by a part of the wound toilet paper, but at least a part of the back side toilet paper and the front side toilet paper are joined. Then, the toilet paper on the back side will be wound up following the toilet paper on the front side. If the two-ply toilet paper is not integrated, hold the end of the front side toilet paper with your finger and wind it until the front side toilet paper comes to the top of the toilet roll. The toilet paper does not follow the toilet paper on the front side and is not rolled up, or the toilet paper on the back side is separated from the toilet paper on the front side and falls off in the middle. If the front side toilet paper is further wound in this state, the front side toilet paper comes to the back side and the back side toilet paper comes to the front side, resulting in a so-called "rewinding" state, which causes a problem during use.

Single embossing is performed by applying an embossed roll with embossing to the entire width direction and applying pressure. The amount of embossed roll is the thickness when pressure of 0.5 gf / cm ² is applied to toilet paper of 2 plies or more and the thickness of toilet paper of 2 plies or more when pressure of 50 gf / cm ² is applied. Is preferably adjusted so as to be within the above-mentioned range.

In the two-ply toilet paper, the height of the embossing can be measured as the thickness of the toilet paper. FIG. 3 is a cross-sectional view illustrating the relationship between the embossed height and the thickness of the 2-ply toilet paper. FIG. 3 is a cross-sectional view of a 2-ply toilet paper subjected to single embossing. As shown in FIG. 3, in the single-embossed 2-ply toilet paper, the same embossing pattern is formed on the front side toilet paper 20a and the back side toilet paper 20b, and the regularity of the embossing pattern is formed. Are in agreement. In FIG. 3, the distance C represents the embossing height of each ply, and the distance D represents the thickness of the 2-ply toilet paper. As is clear from FIG. 3, in the single-embossed 2-ply toilet paper, the embossed height of each ply and the thickness of the 2-ply toilet paper are in a proportional relationship, and the embossed height of each ply is high. The thicker the 2-ply toilet paper, the thicker it becomes. Therefore, in the single-embossed 2-ply toilet paper, specifying the thickness of the 2-ply toilet paper is synonymous with defining the height of the embossing.

The toilet roll of the present invention is formed by wrapping toilet paper around a core core (paper tube). The core core diameter is preferably 30 mm or more and 40 mm or less. The core diameter of the toilet roll is the diameter of the core core (paper tube), which is the length represented by S in FIG.

Winding density of toilet rolls of the present invention, when the winding length is 48m, it is preferably 0.45 m / cm ² or more, and more preferably 0.52 m / cm ² or more. Further, it is preferably 0.60 m / cm ² or less, and more preferably 0.57 m / cm ² or less.
When the winding length is 60 m, the winding density of the toilet roll is preferably 0.55 m / cm ² or more, and more preferably 0.65 m / cm ² or more. Further, it is preferably 0.71 m / cm ² or less, and more preferably 0.70 m / cm ² or less.
Winding density of toilet rolls, if the winding length is 75 m, is preferably 0.70 m / cm ² or more, and more preferably 0.82 / cm ² or more. Further, it is preferably 0.90 m / cm ² or less, and more preferably 0.88 m / cm ² or less.
The winding density is a value when the core core diameter is 39 mm.

The winding density of the toilet roll is calculated by dividing the length twice the winding length of the 2-ply toilet roll by the cross-sectional area of the roll excluding the cross-sectional area of the paper tube (P (dot-shaped pattern portion) in FIG. 2). 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 / toilet roll cross-sectional area

The average hand feel value of the front surface and the back surface of the toilet paper of the present invention is preferably 70.0 or more, more preferably 71.0 or more, and further preferably 72.0 or more. The upper limit of the HF value is not particularly limited, but 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 Electrical GmbH).
First, a circularly cut sample having a diameter of 112.8 mm is placed on the sample table of the tissue softness analyzer. A bladed rotor is pushed from above with a pushing pressure of 100 mN against this sample. After that, the rotor with a blade is rotated so that the rotation speed becomes 2.0 rotations / second, and the vibration frequency at that time is measured.
Further, the amount of deformation and displacement in the vertical direction when the rotor with a blade is pushed in with a pressure of 100 mN and 60 mN with respect to another sample cut into a circle having a diameter of 112.8 mm 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 as the calculation algorithm.
When calculating the HF value, the exposed side surface of the front side toilet paper and the exposed side surface of the back side toilet paper are measured 10 times each, and the abnormal value is excluded from the obtained measurement data by the method of the Hampel identifier. .. Then, the average value of the HF value of the toilet paper is calculated from the average value of the HF value of each surface.
The sample is measured in an environment compliant with ISO187 (temperature 23 ± 1 ° C., relative humidity 50 ± 2%). At the time of measurement, calibrate with a standard sample (emethec ref.2X (nn.n)) according to the attached instruction manual, and set the algorithm to TP II. Calculation software includes emethec measurement system ver. Use 3.22.

The tensile strength of the toilet paper having 2 plies or more in the length direction is preferably 1.00 N / 15 mm or more, and more preferably 1.30 N / 15 mm or more. Further, the tensile strength of the toilet paper having 2 plies or more in the length direction is preferably 3.00 N / 15 mm or less, and more preferably 2.60 N / 15 mm or less.
The tensile strength of the toilet paper having 2 plies or more in the width direction is preferably 0.30 N / 15 mm or more, and more preferably 0.40 N / 15 mm or more. Further, the tensile strength of the toilet paper having 2 plies or more in the width direction is preferably 2.00 N / 15 mm or less, more preferably 1.50 N / 15 mm or less, and preferably 1.20 N / 15 mm or less. More preferred.

The tensile strength of toilet paper having two or more plies can be measured using a horizontal tensile tester (manufactured by Kumagai Riki Co., Ltd.). In this case, a sample having a width of 15 mm is used, and the measurement is performed under the conditions of a tensile speed of 50 mm / min and a span length of 100 mm. The tensile strength in the present specification is the tensile strength of 2-ply toilet paper, which is an average value of 6 samples. The tensile strength is measured in an environment compliant with ISO187 (temperature 23 ± 1 ° C., relative humidity 50 ± 2%).

(Fiber raw material)
Toilet paper is obtained by making a slurry containing a fiber raw material. Pulp is preferably used as the fiber raw material. Examples of the pulp include wood pulp, non-wood pulp, and deinked pulp. Examples of wood pulp include broadleaf pulp (blightwood kraft pulp (LKP)), coniferous tree pulp (coniferous kraft pulp (NKP)), sulfite pulp (SP), dissolved pulp (DP), soda pulp (AP), and unbleached craft. Examples thereof include chemical pulp such as pulp (UKP) and oxygen bleached kraft pulp (OKP). Examples thereof include semi-chemical pulp such as semi-chemical pulp (SCP) and chemiground wood pulp (CGP), mechanical pulp such as crushed wood pulp (GP) and thermomechanical pulp (TMP, BCTMP), but are not particularly limited. Examples of the non-wood pulp include cotton pulp such as cotton linter and cotton lint, non-wood pulp such as hemp, straw and bagasse, and cellulose, chitin and chitosan isolated from squirrel and seaweed, but are not particularly limited. .. Examples of the deinked pulp include deinked pulp made from used paper, but the deinking pulp is not particularly limited. As the pulp, one of the above types may be used alone, or two or more types may be mixed and used.

As the fiber raw material, it is preferable to use at least one selected from softwood pulp and hardwood pulp, and it is preferable to use softwood pulp. Above all, in the present invention, it is preferable to use softwood pulp and hardwood pulp in combination, and it is more preferable to use softwood kraft pulp (NKP) and hardwood kraft pulp (LKP) in combination.

When softwood pulp is used as a fiber raw material, the content of softwood pulp is preferably 20% by mass or more, preferably 30% by mass or more, based on the total mass of the pulp components contained in the toilet paper. More preferably, it is more preferably 40% by mass or more. The content of 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 softwood pulp within the above range, it becomes easy to set the basis weight, HF value, etc. of the toilet paper within a desired range.

As the fiber raw material, it is preferable to use softwood pulp and hardwood pulp in combination. That is, it is preferable that the toilet paper further contains hardwood pulp in addition to softwood pulp. The content of hardwood pulp is preferably 10% by mass or more, more preferably 20% by mass or more, and preferably 30% by mass or more, based on the total mass of the pulp components contained in the toilet paper. More preferred. The content of 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 hardwood pulp within the above range, it becomes easy to set the basis weight, HF value, etc. of the toilet paper within a desired range.

The freeness represented by the Canadian Freeness Standard (CFS) of the fiber component (pulp component) contained in the toilet paper is preferably 400 ml or more, more preferably 450 ml or more, and 500 ml. The above is more preferable. 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 basis weight, HF value, etc. of the toilet paper within a desired range, and the toilet paper having an excellent feel is obtained. The freeness of the fiber component can be adjusted by controlling the beating conditions, as will be described later.

(Optional ingredient)
Toilet paper may contain arbitrary components in addition to the fiber raw material. Examples of the optional component include a dry paper strength agent, a wet paper strength agent, a softener, and the like. Examples of the dry paper strength agent include cationized starch, polyacrylamide (PAM), carboxymethyl cellulose (CMC) and the like. Examples of the wet paper strength agent include polyamide epichlorohydrin, urea, melamine, and heat-crosslinkable polyacrylamide. Examples of the softener include anionic surfactants, nonionic surfactants, cationic surfactants and the like. The above optional components may be used alone 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 part by mass or more and 0.50 part by mass with respect to 100 parts by mass of the fiber component contained in the toilet paper. The following is preferable.
When the toilet paper contains a wet paper strength agent, the content of the wet paper strength agent is 0.001 part by mass or more and 0.10 part by mass with respect to 100 parts by mass of the fiber component contained in the toilet paper. The following is preferable.
When the toilet paper contains a softener, the content of the softener is 0.01 part by mass or more and 0.50 part by mass or less with respect to 100 parts by mass of the fiber component contained in the toilet paper. It is preferable to have.
In the present invention, the strength of the toilet paper is maintained even when the basis weight is reduced by appropriately adjusting the amount of the optional component added as described above.

(Manufacturing method of toilet roll)
The method for manufacturing a toilet roll of the present invention includes a step of embossing substantially uniformly over the entire width direction in a state where two or more plies of toilet paper are laminated, and a roll of two or more plies of embossed toilet paper. Including the process of winding up.
It is preferable that the above-mentioned embossing process is performed only once in the entire process of the toilet roll manufacturing method.

Further, before laminating toilet paper having two or more plies, a step of obtaining a toilet paper web having one ply is included. The step of obtaining a 1-ply toilet paper web includes a step of obtaining a slurry containing a fiber 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 beating process can be performed using a double disc refiner or the like. At this time, the softwood pulp and the hardwood pulp may be beaten individually, or may be beaten after being mixed.

The step of obtaining a one-ply toilet paper web includes a step of making a slurry containing a fiber raw material. Paper machines used in the paper making process include, for example, suction breast formers (circular mesh type, long mesh type), twin wire formers, circular mesh 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 net-like wire to form a thin layer of pulp. Then, while being transferred toward the press part, the water in the pulp thin layer is drained under the net, so that the pulp thin layer is dehydrated. Such a process is sometimes called a dehydration process. Generally, the wire is a ring of metal or plastic mesh.

In the process of papermaking, for example, a method of making a pulp slurry in which coniferous pulp and hardwood pulp are mixed to form a wet paper as one uniform layer, or a method of making a single sheet of coniferous pulp layer and hardwood pulp layer. There is a method of forming wet paper, but any method may be adopted.

After the dehydration process, the wet paper moves from the wire to the felt. By applying pressure with a press roll through the felt, the wet paper is further mechanically squeezed. This is sometimes called a pressing process or a water extraction process.

The papermaking step preferably 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 crimping the dryer cylinder to the outer peripheral surface.

The step of laminating the 1-ply toilet paper web includes a step of winding two base papers on a ply machine, unwinding them, and laminating two base papers. In addition, a step of performing calendar processing after bonding may be provided.

The embossing step is provided after the step of laminating the 1-ply toilet paper web. The embossing is performed by embossing the embossed pattern by passing a toilet paper web laminated so as to have two plies between the embossed roll and the rubber roll on which the convex structure constituting the embossed pattern is installed. By changing the embossing height, the pushing amount, and the pushing pressure of the embossing roll, an emboss having a desired embossing height can be formed.
Here, it is preferable that the embossing roll used for embossing is provided with a convex structure having a convex structure height of 0.75 mm or more and 0.85 mm or less. Further, it is preferable that the embossed roll is provided with a substantially uniform convex structure having a convex structure density (embossing density) of 10 pieces / cm ² or more and 30 pieces / cm ² or less. In the embossing process, it is preferable to emboss the embossed roll at a pressure of 8 kgf / cm or more and 20 kgf / cm or less.

After the embossing step, a winding step is further provided. In this winding step, winding is performed for a predetermined length so as to satisfy a predetermined product length. Then, the obtained take-up roll is cut into a predetermined width.
In the winding step, for example, using a winder having a mandrel shaft, the following can be performed. (1) First, the paper tube to be the core is inserted into the mandrel shaft and fixed. (2) Adhesive is attached to the paper tube, and the starting end of the toilet paper is adhered and fixed to the paper tube. (3) By rotating the mandrel shaft, 2-ply toilet paper is wound around the core tube by the length of the product.

Further, in the winding step, when winding, it is possible to wind while supporting the roll with a plurality of drive rolls (for example, upper roll, lower roll, rider roll, etc.) from the outside, and in the present invention, such It is also preferable to use the method (surface method). By winding on the surface method, the pressing pressure of the drive roll can be adjusted, and it becomes easier to control the winding diameter of the toilet roll. It is also possible to increase the production speed.

The features of the present invention will be described in more detail with reference to Examples and Comparative Examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be appropriately changed as long as they do not deviate from the gist of the present invention. Therefore, the scope of the present invention should not be construed as limiting by the specific examples shown below.

(Examples 1 and 2)
A pulp slurry mixed so as to have 24 parts by mass of softwood kraft pulp (NKP) and 76 parts by mass of hardwood kraft pulp (LKP) was beaten with a beating power of 200 Kw using a double disc refiner. A softener (manufactured by Seikou PMC Co., Ltd.) of 0.03 parts by mass and a wet paper force agent (manufactured by Seikou PMC Co., Ltd.) of 0.05 parts by mass were added to the pulp slurry to prepare a pulp slurry for papermaking.
The prepared pulp slurry for papermaking was made by a twin wire Yankee machine to obtain a toilet paper web winding. The papermaking conditions were adjusted so that the basis weight (1 ply) of the toilet paper was as shown in Table 1.
The two obtained base paper rolls were put on a processing machine, unwound, and then bonded to two plies. Then, the two-ply toilet paper as it was stuck was embossed from one side (from the front side). In the embossing process, the paper thickness was increased to the thickness shown in Table 1 by using an embossed roll. In Example 2, further pressurization was performed in the embossing process. Then, the toilet paper was wound around a core having a core diameter of 39 mm by a surface method. In the surface-type winding process, the pressing pressure of the rider roll was adjusted so as to have the winding diameter shown in Table 1, and the winding was rewound to the length shown in Table 1. A 2-ply toilet roll was obtained by cutting the obtained winding into a predetermined width.

(Examples 3 and 4)
A pulp slurry mixed so as to have 22 parts by mass of softwood kraft pulp (NKP) and 78 parts by mass of hardwood kraft pulp (LKP) was beaten with a beating power of 200 Kw using a double disc refiner. A softener (manufactured by Seikou PMC Co., Ltd.) and 0.05 parts by mass of a wet paper force agent (manufactured by Seikou PMC Co., Ltd.) were added to the above pulp slurry to prepare a pulp slurry for papermaking. A 2-ply toilet roll was obtained in the same manner as in Example 1 except that the embossing conditions were adjusted so that the paper thickness was as shown in Table 1.

(Comparative Examples 1 and 2)
Comparative Examples 1 and 2 are known products on the market.

(Evaluation)
(Basis weight)
The basis weight of the toilet paper obtained in Examples and Comparative Examples was measured according to JIS P 8124. The basis weight shown in Table 1 is the basis weight of 1-ply toilet paper.

(Tensile strength)
The tensile strength of the toilet paper obtained in Examples and Comparative Examples was measured using a horizontal tensile tester (manufactured by Kumagai Riki Co., Ltd.) under the conditions of a sample width of 15 mm, a tensile speed of 50 mm / min, and a span length of 100 mm. As for the tensile strength, the strength of the 2-ply toilet paper was measured in both the vertical direction and the horizontal direction. The average value of 6 samples was calculated in each direction and used as the respective tensile strength. The tensile strength was measured in an environment compliant with ISO187 (temperature 23 ± 1 ° C., relative humidity 50 ± 2%).

(Measurement of HF value)
The HF values of the toilet papers obtained in Examples and Comparative Examples were measured using a tissue softness analyzer (manufactured by Emtec Electrical GmbH). A circularly cut sample having a diameter of 112.8 mm was placed on a sample table, and a rotor with a blade was pushed into the sample from above by applying a pushing pressure of 100 mN. Then, the rotor with a blade was rotated so that the rotation speed was 2.0 rotations / second, and the vibration frequency at that time was measured. Further, the amount of deformation and displacement in the vertical direction when the rotor with a blade was pushed in at a pressure of 100 mN and 60 mN with respect to another sample cut into a circle having a diameter of 112.8 mm was calculated. The HF value is a value calculated from the vibration frequency and the amount of deformation displacement, and TPII was used as the calculation algorithm. The above measurement was performed 10 times for each of the front surface (outer surface) and the back surface (inner surface) of each sample, and abnormal values were excluded from the obtained measurement data by the method of the Hampel identifier, and the average values for the front surface and the back surface, respectively. Was calculated. Further, the average value of the HF values of the two surfaces calculated in this way was calculated and used as the HF value for the evaluation.
The measurement of the sample was performed in an environment compliant with ISO187 (temperature 23 ± 1 ° C., relative humidity 50 ± 2%). At the time of measurement, the standard sample (emethec ref.2X (nn.n)) was calibrated according to the attached instruction manual, and the algorithm was set to TP II. For the calculation software, emethec measurement system ver. 3.22 was used.

(Compressibility)
The compressibility of the toilet papers obtained in Examples and Comparative Examples was measured using a KES FB3-AUTO-A automated compression tester (manufactured by Kato Tech Co., Ltd.). A sample cut to 10 cm x 10 cm is placed between the 2 cm ² pressure plate and the pressure receiving plate, and the pressure plate is lowered at a speed of 50 seconds / mm. At that time, the pressure that changes from moment to moment and the thickness of the sample at that time The following items were calculated by measuring.
T ₀ : Thickness of sample under pressure 0.5 gf / cm ² T _m : Thickness of sample under pressure 50 gf / cm ² The values of the above items are the measurement data obtained by performing 10 measurements for each sample. It is a value calculated as an average value by excluding outliers from the above by the method of Hampel identifier. The measurement of the sample was performed in an environment compliant with ISO187 (temperature 23 ± 1 ° C., relative humidity 50 ± 2%).

(sensory evaluation)
The toilet papers obtained in Examples and Comparative Examples were subjected to sensory evaluation with the level hidden. Fifty people were asked to touch the product, and the unevenness on the back surface of the product and the thickness of the toilet paper were evaluated on a four-point scale. The symbols shown in Table 1 have the following meanings.
<Unevenness on the back side>
In the single embossed toilet paper, since the toilet paper is embossed from one side (from the front side) while being attached to the two plies, a concave structure is formed on the front side toilet paper and a convex structure is formed on the back side toilet paper. It is formed. For this reason, the back surface tends to have an uneven feeling (roughness). Therefore, the unevenness on the back surface was evaluated according to the following criteria.
⊚: Small unevenness (roughness) ○: Slightly small unevenness (roughness) Δ: Slightly large unevenness (roughness) ×: Large unevenness (roughness) (roughness)
<Thickness>
In addition, the preference for the thickness of the entire 2-ply toilet paper was evaluated according to the following criteria.
◎: Especially excellent ○: Excellent △: Slightly inferior ×: Inferior

As can be seen from Table 1, the toilet paper obtained in the examples has a quality that has less unevenness on the back surface and a feeling of thickness, so it can be said that the toilet paper has an excellent feel. On the other hand, in Comparative Example 1, the unevenness on the back surface was felt to be large, and the feeling of touch was inferior. Further, in Comparative Example 2, the feeling of thickness was small and the feeling of touch was inferior.
In the toilet paper of Comparative Example 2, the adhesion of each ply was weak, and there was a case where an unintended peeling between plies occurred when the toilet roll was used. On the other hand, the toilet paper obtained in the examples did not cause such a problem.

20 Toilet paper 20a Front side toilet paper 20b Back side toilet paper 100 Toilet roll P Toilet roll Roll cross-sectional area R Toilet roll roll winding diameter S Paper tube diameter

Claims (7)

It is a toilet roll in which two or more plies of toilet paper having at least front side toilet paper and back side toilet paper are wound into a roll shape.
The winding length of the toilet roll is 48 m or more and 75 m or less, and the winding diameter is 110 mm or more and 120 mm or less.
The basis weight per ply of the toilet paper is 10 g / m ² or more and 16 g / m ² or less.
The difference between the thickness when a pressure of 0.5 gf / cm ² is applied to the toilet paper of 2 plies or more and the thickness when a pressure of 50 gf / cm ² is applied to the toilet paper of 2 plies or more is 187 to 197 μm. Yes,
The toilet paper having two or more plies has embossing formed substantially uniformly in the width direction.
A toilet roll in which the same embossed pattern is formed on the front side toilet paper and the back side toilet paper, and the regularity of the embossed pattern is the same. The toilet roll according to claim 1, wherein the thickness of the toilet paper having 2 plies or more when a pressure of 50 gf / cm ² is applied is 180 μm or more and 270 μm or less. The toilet roll according to claim 1 or 2, wherein the thickness of the toilet paper having 2 plies or more when a pressure of 0.5 gf / cm ² is applied is 320 μm or more and 520 μm or less. The toilet roll according to any one of claims 1 to 3, wherein when the toilet paper having two or more plies is divided into three in the width direction, the difference in embossing density between adjacent regions is 10% or less. The toilet roll according to any one of claims 1 to 4, wherein the average hand feel value of the front surface and the back surface of the toilet paper having 2 plies or more is 70.0 or more. A process of embossing substantially uniformly in the width direction in a state where two or more plies of toilet paper having at least front side toilet paper and back side toilet paper are laminated.
A method for manufacturing a toilet roll, which comprises a step of winding the embossed toilet paper of 2 plies or more into a roll shape.
The step of embossing is a step of forming an embossed pattern having the same embossing pattern and matching regularity on the front side toilet paper and the back side toilet paper.
The winding length of the toilet roll is 48 m or more and 75 m or less, and the winding diameter is 110 mm or more and 120 mm or less.
The basis weight per ply of the toilet paper is 10 g / m ² or more and 16 g / m ² or less.
The difference between the thickness when a pressure of 0.5 gf / cm ² is applied to the toilet paper of 2 plies or more and the thickness when a pressure of 50 gf / cm ² is applied to the toilet paper of 2 plies or more is 187 to 197 μm. There is a method of manufacturing toilet rolls. The method for manufacturing a toilet roll according to claim 6, wherein the step of embossing is provided only once in all the steps of the method for manufacturing a toilet roll.

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