Tissue paper and method for manufacturing tissue paper

Abstract

To provide tissue paper excellent in softness.SOLUTION: In tissue paper containing a softener, a dry tensile strength in the longitudinal direction is 200 cN / 25 mm or more and 400 cN / 25 mm or less, and the degree of elongation in the longitudinal direction is 5% or more and 25%, and a tensile stress in the longitudinal direction in a proportional limit is 160 cN or more and 250 cN.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to tissue paper and a method for manufacturing tissue paper. [Background technology]

[0002] Tissue paper contains a softener to soften the paper, and also has a certain tensile strength to prevent the paper from tearing (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-182741 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been an increasing demand for soft tissue paper, but if the amount of softener added is increased, the paper will not stick to the dryer during drying, making it difficult to crepe, and it will not become softer. Also, if the tensile strength is reduced, the paper will become softer but will also be more prone to tearing. Therefore, there is a limit to how much softness can be improved with conventional tissue paper.

[0005] An object of the present invention is to provide tissue paper with excellent softness. [Means for solving the problem]

[0006] A first aspect of the present invention provides tissue paper containing a softener, having a dry tensile strength in the machine direction of 200 cN / 25 mm or more and 400 cN / 25 mm or less, an elongation in the machine direction of 5% or more and 25% or less, and a tensile stress in the machine direction at the proportional limit of 160 cN or more and 250 cN or less.

[0007] As used herein, softeners include components that impart softness to the paper that constitutes tissue paper.

[0008] The machine direction refers to the direction of fiber flow (or MD) during tissue paper manufacturing. Dry tensile strength refers to the strength of tissue paper when pulled in a dry state. Elongation is the length, expressed as a percentage, that tissue paper stretches until it breaks when a tensile load is applied. The tensile stress at the proportional limit refers to the maximum tensile stress in the region where the stress due to the tensile load (tensile stress) and elongation are proportional.

[0009] In the first embodiment, by containing a softener and setting the dry tensile strength in the machine direction to 200 cN / 25 mm or more and 400 cN / 25 mm or less, the elongation in the machine direction to 5% or more and 25% or less, and the tensile stress in the machine direction at the proportional limit to 160 cN or more and 250 cN or less, tissue paper that is tear-resistant and has excellent softness can be obtained.

[0010] A second aspect of the present invention provides tissue paper, wherein the softener contains 0.1% by mass or more and 0.25% by mass or less of oil extracted with diethyl ether. In the second aspect, the softness of the tissue paper can be improved by including a softener containing 0.1% by mass or more and 0.25% by mass or less of oil extracted with diethyl ether.

[0011] A third aspect of the present invention provides tissue paper having a proportional limit displacement rate of 40% or more. In this specification, the proportional limit displacement rate is expressed as a percentage obtained by dividing the displacement of tissue paper when a tensile load is applied and a tensile stress at the proportional limit is applied by the displacement from the application of the tensile stress at the proportional limit to the time of breakage.

[0012] A high proportional limit displacement rate indicates that the paper expands and contracts greatly. In the third aspect, the proportional limit displacement rate is set to 40% or more, which further improves the softness of the tissue paper.

[0013] A fourth aspect of the present invention provides tissue paper having a 150 cN permanent displacement of 21% or more. In this specification, permanent displacement refers to the amount of elongation that does not return to its original shape when a certain load is applied and then released. The permanent displacement refers to the amount of elongation that does not return to its original shape when a certain load is applied and then released, expressed as a percentage. The 150 cN permanent displacement refers to the permanent displacement under a load of 150 cN.

[0014] In addition, when the permanent displacement rate is compared under a constant load, if the displacement is large and the permanent displacement when no load is applied is small, the tissue paper has a large return to its original elongation and is soft. In the fourth aspect, by making the permanent displacement rate at 150 cN 21% or more, the softness of the tissue paper can be further improved.

[0015] A fifth aspect of the present invention provides tissue paper having a spherical compression work load of 300 mJ or less. In this specification, the spherical compression work load refers to the work load when 10 pieces (sets) of tissue paper rolled to approximately the same size under the same conditions are prepared, placed in a specified container, and compressed to a volume of approximately 200 ml.

[0016] This spherical compression work indicates an index of the softness of the tissue paper when rolled up. In the fifth aspect, by setting the spherical compression work to 300 mJ or less, the softness of the tissue paper can be further improved.

[0017] A sixth aspect of the present invention provides tissue paper having an arithmetic mean height of 3 μm or more and 7 μm or less. In the sixth aspect, by setting the arithmetic mean height to 3 μm or more and 7 μm or less, the smoothness of the tissue paper can be improved.

[0018] A seventh aspect of the present invention is a method for producing tissue paper according to any one of the first to sixth aspects, comprising: a papermaking step of making a wet paper from the pulp slurry to which the softener has been added; a drying step of turning the wet paper into a dry paper in a Yankee dryer; and a peeling step of peeling the dry paper from the Yankee dryer with a creping doctor, wherein the Yankee dryer is provided with a surface of the Yankee dryer containing a creping agent having a density of 0.5 mg / m 2 More than 3.5mg / m 2 The present invention provides a method for manufacturing tissue paper, in which the following adhesive is applied:

[0019] In a seventh embodiment, the Yankee dryer surface is coated with 0.5 mg / m 2 More than 3.5mg / m 2 The application of the following adhesive allows a thick film to be formed on the surface of the Yankee dryer. This thick film allows the tip of the creping doctor to penetrate between the Yankee dryer and the dry paper during the peeling process, protecting the surface of the dry paper with the film while peeling it off. This results in tissue paper with a uniform, fine crepe.

[0020] In the seventh embodiment, the thick film formed on the surface of the Yankee dryer can prevent the tip of the creping doctor blade from contacting the surface of the Yankee dryer during the peeling step, and therefore, in the seventh embodiment, the thick film can protect the surface of the Yankee dryer.

[0021] An eighth aspect of the present invention provides a method for producing tissue paper, wherein the adhesive contains a thermosetting polyamide resin. When the adhesive applied to the surface of the Yankee dryer contains a thermosetting polyamide resin, when a thick film is formed on the surface of the Yankee dryer, a portion of the film hardens due to strong heating near the Yankee dryer, and a portion of the film softens due to weak heating on the dry paper side away from the Yankee dryer.

[0022] In the eighth embodiment, the soft film formed on the surface of the Yankee dryer makes it easier for dry paper to adhere, facilitating pick-up of the dry paper (adhesion of the wet paper to the Yankee dryer) during the drying process, and the hard film formed on the surface of the Yankee dryer enhances protection of the surface of the Yankee dryer. [Effects of the Invention]

[0023] According to one aspect of the present invention, tissue paper with excellent softness can be provided. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a diagram showing an image of the surface of tissue paper according to an embodiment of the present invention measured by image analysis. [Figure 2] FIG. 10 is an image diagram for explaining the arithmetic mean height. [Figure 3] FIG. 1 is a diagram showing an image of the surface of conventional tissue paper measured by image analysis. [Figure 4] FIG. 1 is a diagram showing an image of the surface of conventional tissue paper measured by image analysis. [Figure 5] 1 is a graph showing the relationship between the displacement and stress of tissue paper due to a tensile load. [Figure 6] 1 is a graph showing permanent displacement at a tensile load of 150 cN. [Figure 7] 1 is a photograph showing a tissue paper specimen used in a spherical compression test placed in a holding container. [Figure 8] FIG. 1 shows the state in which 10 tissue paper specimens used in a spherical compression test are placed in a test container. [Figure 9] FIG. 9 is a schematic front view of FIG. 8. [Figure 10] Looking at the inside of the test container in Figure 8 from the top side, (A) shows the test specimens placed only on the bottom tier, (B) shows the test specimens placed on the bottom and middle tiers, and (C) shows the test specimens placed on the bottom, middle, and top tiers. [Figure 11] FIG. 1 is a diagram showing a state in which a test container containing a test specimen is set in a compression tester (before pressure is applied). [Figure 12] This is a photograph showing tissue paper specimens (from the left: 10cc, 20cc, 35cc, and 50cc) used in spherical compression tests. [Figure 13] 13 is a photograph showing the state at the start of pressure application by the compression tester in FIG. 12. [Figure 14] 13 is a photograph showing the state when pressure is applied by a compression testing machine in FIG. 12. [Figure 15] 1 is a graph showing the relationship between pressure and pressure capacity (pressure) in a spherical compression test. [Figure 16] 1 is a flowchart illustrating a method for manufacturing tissue paper according to an embodiment of the present invention. [Figure 17] 1 is a schematic diagram of an apparatus for producing tissue paper according to an embodiment of the present invention. [Figure 18] FIG. 18 is an enlarged view of a part of FIG. 17. [Figure 19] FIG. 1 is a diagram showing a part of a conventional tissue paper manufacturing process. [Figure 20] FIG. 1 is a diagram showing a part of a conventional tissue paper manufacturing process. [Figure 21] FIG. 1 is a diagram showing a part of a conventional tissue paper manufacturing process. DETAILED DESCRIPTION OF THE INVENTION

[0025] The present invention will be described in detail with reference to the drawings. In each drawing, common parts are designated by the same reference numerals and their description may be omitted. In addition, the scale of each member in each drawing may differ from the actual scale.

[0026] <Tissue paper> The tissue paper according to this embodiment will be described. FIG. 1 shows an image of the surface of the tissue paper according to this embodiment measured by image analysis. In this embodiment, the tissue paper is made of paper. The pulp composition of the paper can be any known paper composition. For example, the pulp content can be 50% by mass or more, preferably 90% by mass or more, and more preferably 100% by mass.

[0027] The basis weight of the paper (also called the basis weight in U.S.) is not particularly limited, and may be, for example, 5 g / m depending on the number of plies of the tissue paper. 2 More than 80g / m 2 and preferably 7 g / m 2 More than 50g / m 2 Less than 9g / m 2 More than 20g / m 2 The basis weight can be measured in accordance with the provisions of JIS P 8124 (2011).

[0028] The thickness of the paper (hereinafter referred to as paper thickness) is not particularly limited, but is 50 μm to 500 μm per two plies, preferably 60 μm to 330 μm, and more preferably 100 μm to 200 μm. The paper thickness can be measured in accordance with the JIS P 8111 (1998) standard.

[0029] The type of tissue paper is not particularly limited, but is preferably general-purpose tissue paper (tissue paper containing no moisturizing component or non-moisturizing tissue paper).Tissue paper can be used for industrial, domestic, or portable purposes, and is preferably used for domestic tissue paper.

[0030] The tissue paper of this embodiment contains a softener. In this specification, the softener includes a component that imparts flexibility to the paper that constitutes the tissue paper. Specifically, the softener has the function of widening the spaces between pulp fibers, forming air layers between the pulp fibers, and penetrating between the pulp fibers to loosen the pulp fibers and soften the paper. Furthermore, the softener applied to the pulp surface reduces friction with the skin and makes the paper smoother.

[0031] The components contained in the softener are not particularly limited. Examples of the components contained in the softener include fatty acid ester compounds, fatty acid amide compounds, etc. When using a fatty acid ester compound and a fatty acid amide compound, either one may be used or both may be used in combination. When using both, the blending ratio of the fatty acid ester compound and the fatty acid amide compound in the softener is optional, but the content ratio of the fatty acid ester compound and the fatty acid amide compound is preferably 1:1 to 1:5.

[0032] Found in fabric softener fat The fatty acid ester compound is preferably a compound of an alcohol having 6 to 24 carbon atoms and a fatty acid having 7 to 25 carbon atoms. The alcohol may be any of a straight-chain alcohol, a branched-chain alcohol, a saturated alcohol, and an unsaturated alcohol. In particular, an alcohol having 10 to 22 carbon atoms is preferred, and lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, and oleyl alcohol are preferred.

[0033] The fatty acid having 7 to 25 carbon atoms may be any of straight-chain fatty acids, branched-chain fatty acids, saturated fatty acids, and unsaturated fatty acids. Of these, fatty acids having 10 to 22 carbon atoms are preferred, and lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, and oleic acid are preferred. These may be used alone or in combination of two or more.

[0034] The fatty acid amide compound contained in the softener can be obtained by reacting a polyalkylene polyamine with a carboxylic acid. A suitable polyalkylene polyamine has at least three amino groups in the molecule and is represented by the following general formula (1):

[0035]

number

[0036] In formula (1), each R1 is independently an alkylene group having 1 to 4 carbon atoms, and n is an integer of 1 to 3. Alkylene Poly In the amine, different R1 groups may exist in the molecule. Two or more types of polyalkylene polyamines can also be used. The preferred R1 group is an ethylene group.

[0037] On the other hand, the carboxylic acid is preferably a carboxylic acid having 10 to 24 carbon atoms, and may be either a saturated carboxylic acid or an unsaturated carboxylic acid. Furthermore, it may be either a linear carboxylic acid or a branched carboxylic acid. Of these, a carboxylic acid having 12 to 22 carbon atoms is preferred, and a carboxylic acid having 14 to 18 carbon atoms is particularly preferred.

[0038] In the tissue paper of this embodiment, the softener preferably contains 0.1% to 0.25% by mass, more preferably 0.12% to 0.22% by mass, of oil extracted with diethyl ether (hereinafter sometimes referred to as extracted oil). Here, diethyl ether efficiently extracts oils and fats, which are low-polarity substances.

[0039] Such oils (oily components) are not normally found in pulp, the main raw material of tissue paper, but are contained in softeners. The oil content range of 0.1% to 0.25% by mass is a high content not found in conventional tissue paper, regardless of the basis weight of the tissue paper.

[0040] The tissue paper of this embodiment has a dry tensile strength in the machine direction of 200 cN / 25 mm or more and 400 cN / 25 mm or less, preferably 210 cN / 25 mm or more and 350 cN / 25 mm or less, and more preferably 220 cN / 25 mm or more and 300 cN / 25 mm or less.

[0041] Here, the machine direction refers to the direction of fiber flow (or MD direction) during the production of tissue paper. The dry tensile strength in the machine direction is the maximum tensile strength of tissue paper in a dry state. D-side Indicates the strength when pulled in the opposite direction.

[0042] In addition, the tissue paper of this embodiment may have any dry tensile strength in the transverse direction, and may be adjusted, for example, to 50 cN / 25 mm or more and 200 cN / 25 mm or less, preferably 60 cN / 25 mm or more and 170 cN / 25 mm or less, and more preferably 60 cN / 25 mm or more and 140 cN / 25 mm or less.

[0043] Here, the cross direction refers to the direction perpendicular to the flow direction of the fibers during the production of the tissue paper (or the CD direction). The dry tensile strength in the cross direction refers to the strength of the tissue paper when it is pulled in the CD direction in a dry state.

[0044] In the tissue paper of this embodiment, the elongation percentage in the machine direction is optional and is adjusted to, for example, 5% to 20%, preferably 8% to 18%, and more preferably 10% to 15%. Here, the elongation percentage in the machine direction is the length, expressed as a percentage, of the tissue paper when it is stretched in the machine direction of the tissue paper in a dry state during production to break.

[0045] The tissue paper of this embodiment has a longitudinal tensile stress at the proportional limit of 160 cN to 250 cN, preferably 160 cN to 240 cN, and more preferably 160 cN to 230 cN. Here, the tensile stress at the proportional limit refers to the maximum tensile stress in the region where the stress due to the tensile load (tensile stress) and the elongation are proportional to each other.

[0046] The tensile stress at the proportional limit is, for example, the tensile stress at a position (point B) that deviates from the proportional line PL, which indicates the proportional relationship between the displacement of the tissue paper due to a tensile load and the stress, in the graph shown in Figure 5. In Figure 5, A indicates the start of the tensile load (the origin of displacement or point 0), B indicates the proportional limit, and C indicates the time of breakage.

[0047] The tissue paper of this embodiment is adjusted to have a proportional limit displacement rate of preferably 40% or more, more preferably 42% or more, and even more preferably 45% or more. The upper limit of the proportional limit displacement rate is not particularly limited, and can be adjusted to, for example, 70% or less.

[0048] Here, the proportional limit displacement rate is the displacement when a tensile load is applied to a tissue paper and a tensile stress at the proportional limit is applied, divided by the displacement from the application of the tensile stress at the proportional limit to the time of breakage, and is expressed as a percentage, and is calculated using the following formula (2).

[0049]

number

[0050] The tissue paper has crepes formed, and these crepes are stretched up to the proportional limit, resulting in a large amount of stretch and shrinkage of the tissue paper. However, after the proportional limit, the entanglement of the pulp fibers gradually stretches, reducing the amount of stretch and shrinkage of the tissue paper, and the tissue paper tends to break.

[0051] From this point of view, a high proportional limit displacement rate indicates that the tissue paper is displaced greatly until it breaks under tensile load, and that the tissue paper expands and contracts greatly. Note that a large expansion and contraction of the tissue paper indicates that many crepes are formed, and that the crepes are finely and uniformly formed, resulting in improved surface properties.

[0052] The tissue paper of this embodiment is adjusted so that the displacement at 150 cN is preferably 2.4% or more, more preferably 2.5% or more, and even more preferably 2.6% or more, and the displacement at 250 cN is preferably 4.5% or more, more preferably 4.6% or more, and even more preferably 4.7% or more.

[0053] In this specification, 150 cN indicates the tensile strength of tissue paper within the proportional limit, and 250 cN indicates the tensile strength of tissue paper outside (or beyond) the proportional limit. The displacement of 150 cN indicates the displacement of tissue paper when a constant load of 150 cN is applied in the machine direction, and the displacement of 250 cN indicates the displacement of tissue paper when a constant load of 250 cN is applied in the machine direction.

[0054] Here, permanent displacement refers to the amount of elongation that does not return to its original state when a certain load is applied and then released. A permanent displacement of 150 cN refers to the permanent displacement under a load of 150 cN. A permanent displacement of 250 cN refers to the permanent displacement under a load of 250 cN.

[0055] For example, in the graph shown in Figure 6, permanent displacement indicates the amount of displacement that does not return to its original state when a load of 150 cN is applied and then released. In Figure 6, D indicates the start of the tensile load, E indicates the time when a load of 150 cN is applied, and the Y axis of F indicates permanent displacement.

[0056] The tissue paper of this embodiment preferably has a permanent deformation rate of 21% or more at 150 cN, more preferably 23% or more, and preferably has a permanent deformation rate of 30% or more at 250 cN, more preferably 35% or more.

[0057] Here, the permanent displacement is the elongation that does not return to its original state when a certain load is applied and then released, expressed as a percentage. The permanent displacement of 150 cN indicates the permanent displacement under a load of 150 cN. The permanent displacement of 250 cN is 2 The permanent displacement rate under a load of 50 cN is shown.

[0058] Furthermore, if the permanent displacement rate (the displacement is large when compared under a constant load and the permanent displacement when no load is applied) is low, the tissue paper will recover more easily and is soft.

[0059] The tissue paper of this embodiment is adjusted so that the spherical compression work load is preferably 300 mJ or less, more preferably 290 mJ or less, and even more preferably 260 mJ or less. Here, the spherical compression work load refers to the work load when 10 pieces (sets) of tissue paper rolled to approximately the same size under the same conditions are prepared, placed in a specified container, and compressed to a volume of approximately 200 ml.

[0060] This spherical compression work is an index of the softness of the tissue paper when rolled up. Specifically, the spherical compression work can be measured by the spherical compression test shown in Figs. 7 to 14.

[0061] First, a set of tissue paper conditioned under standard conditions in the JIS P 8111 (1998) environment is gently rolled up in the palms of both hands without crushing, placed in a 40 cc plastic container, and left there for 10 minutes to prepare tissue paper specimens (tissue paper balls or spherical tissue paper) (Fig. 7). In this embodiment, 10 such specimens are prepared.

[0062] Next, the 10 test specimens were placed in a 500 mL glass beaker so that they were evenly spaced within the beaker (Fig. 8). Specifically, as shown in Figs. 9 and 10, three test specimens (spherical tissue paper) were placed in the bottom row 1, three in the middle row 2, and four in the top row 3, with the specimens evenly spaced apart so as not to crush them.

[0063] A circular acrylic plate (82 mm in diameter, 20 mm in diameter hole in the center, 59.5 g in weight, 49.67 cm in area) was placed on top of 10 tissue papers placed in a beaker. 2 ) gently placed on top.

[0064] The spherical compression test begins within 3 minutes of placing the acrylic plate. Specifically, as shown in Figure 11, a timer is placed on the right side of the beaker containing the test specimen, and a push-pull gauge (manufactured by IMADA, product name "Digital Force Gauge Z2-20N") is lowered at a speed of 0.525 cm / sec. The tip of the push-pull gauge is positioned approximately 13.4 cm from the platform on which the beaker is placed. The end point of 200 mL is 5.0 cm from the platform on which the beaker is placed.

[0065] Ten men and women evaluated the softness of the tissue paper when it was rolled up (Figure 12). Eight out of the ten people chose 20cc as the size of the ball of tissue paper when squeezed. Therefore, the endpoint was set at 200mL for 10 balls.

[0066] In the spherical compression test, the "initial volume" was determined as the moment when the push-pull gauge contacted the acrylic disc and began to apply pressure, as shown in FIG. 13. In this embodiment, the load was initiated (0.00 cN) when the timer display showed 10.56 seconds. The initial volume was 514.80 cc. Then, as shown in FIG. 14, when the volume reached 200 mL, the time was 21.38 seconds and the load of the push-pull gauge was -12.37 N.

[0067] Next, calculate the spherical compression work. The tip of the push-pull gauge descends every 0.4 seconds and the pushing amount is approximately 0.20 cm. k (cm) and the pushing load Fk (kgf). Fk is calculated by adding the weight of the acrylic disc (59.5g) and the load (N) displayed on the push-pull gauge. The spherical compression work W (mJ) is calculated using the following formula (3).

[0068]

number

[0069] From equation (3), when k=1, L k -L k-1= 0.215 cm, 1 / 2 × (F1 + F2) = 0.065 kgf, and the work volume W1 = 1 mJ. Similarly, when k = 2, W2 = 2 mJ. The total work volume (spherical compression work volume) from the initial volume to 200 mL is W = 260 mJ. The work volume W corresponds to the area under the curve in the graph shown in Figure 15.

[0070] The tissue paper of this embodiment preferably has an arithmetic mean height of 3 μm to 7 μm, more preferably 4 μm to 6.5 μm, and even more preferably 5 μm to 6 μm. Here, the arithmetic mean height refers to the average of the absolute values ​​of the differences in height at each point relative to the average plane of the surface (see FIG. 2).

[0071] In conventional tissue paper, as shown in Figure 3, there are areas where crepes are not formed, and the surface of the tissue paper is flat with little unevenness, or the crepes are large and uneven as shown in Figure 4. For this reason, conventional tissue paper tends to have little stretch and feel hard, and there are limits to how much softness and smoothness can be improved.

[0072] In contrast, the tissue paper of this embodiment has uniform, fine crepes formed, as shown in Figure 1, which give it great stretch and a soft feel. To achieve this effect, this embodiment contains a softener, as described above, and the dry tensile strength in the machine direction is set to 200 cN / 25 mm or more and 400 cN / 25 mm or less, the machine direction elongation rate is set to 5% or more and 25% or less, and the machine direction tensile stress at the proportional limit is set to 160 cN or more and 250 cN or less. This results in tissue paper that is tear-resistant and has excellent softness.

[0073] As described above, the tissue paper of this embodiment contains 0.1% by mass or more and 0.25% by mass or less of oil (softener) extracted with diethyl ether, thereby improving the softness of the tissue paper.

[0074] In the tissue paper of this embodiment, as described above, the proportional limit displacement rate is set to 40% or more, thereby further improving the softness of the tissue paper.

[0075] In the tissue paper of this embodiment, as described above, the softness of the tissue paper can be further improved by making the permanent displacement at 150 cN 21% or more.

[0076] In the tissue paper of this embodiment, as described above, the softness of the tissue paper can be further improved by setting the spherical compression work to 300 mJ or less.

[0077] In the tissue paper of this embodiment, as described above, the smoothness of the tissue paper can be improved by setting the arithmetic mean height to be 3 μm or more and 7 μm or less.

[0078] <Tissue paper manufacturing method> A method for manufacturing tissue paper according to this embodiment will now be described. Fig. 16 is a flowchart for carrying out the method for manufacturing tissue paper according to this embodiment. Fig. 17 is a schematic diagram of an apparatus for manufacturing tissue paper according to this embodiment, and Fig. 18 is an enlarged view of a portion of Fig. 17. Note that parts that are common to each figure may be given the same reference numerals and descriptions thereof may be omitted.

[0079] The tissue paper manufacturing method according to this embodiment is the same as the tissue paper manufacturing method described above, and includes a papermaking step S1, a drying step S2, and a peeling step S3 (FIG. 16). Note that the tissue paper manufacturing method according to this embodiment is one example of the tissue paper manufacturing method according to the present invention.

[0080] The method for manufacturing tissue paper according to this embodiment can be realized, for example, by a tissue paper manufacturing apparatus 100 shown in Fig. 17. The apparatus 100 shown in Fig. 17 includes a suction cylinder 10, a pulp slurry supply unit 20, a blanket 30, a roll 40, a Yankee dryer 50, a hot air hood 60, an adhesive supply unit 70, a creping doctor 80, and a cleaning doctor 90. Here, the method for manufacturing tissue paper shown in Fig. 16 will be specifically described using the apparatus 100 shown in Fig. 17.

[0081] In the papermaking process S1, the pulp slurry PS to which the softener has been added is made into a wet paper P1. Specifically, the pulp slurry PS is supplied from a pulp slurry supply unit 20 to the surface of a rotating suction cylinder 10. A long blanket 30 is transported along a roll 40 (transport roll 42). The transport speed of the blanket 30 is arbitrary, and is, for example, 900 to 1300 m / min.

[0082] The supplied pulp slurry PS is transferred to the blanket 30 when the blanket 30 passes between the suction cylinder 10 and the couch roll 41. The pulp slurry PS transferred to the blanket 30 is dewatered while being transported to the touch roll 43, and becomes a wet paper web P1.

[0083] In the drying step S2, the wet paper P1 is dried in a Yankee dryer 50 to become a dry paper P2. When the wet paper P1 passes between the counter-rotating touch roll 43 and the surface of the inlet side 51 of the Yankee dryer 50, it is separated from the blanket 30 and adhered to the surface of the Yankee dryer 50.

[0084] The blanket 30 from which the wet paper P1 has been separated is transported to the hitch roll 44, and then further transported to the touch roll 45, and passes again between the touch roll 45 and the surface of the Yankee dryer 50. At this time, a portion of the wet paper P1 remaining on the blanket 30 is adhered to the surface of the Yankee dryer 50.

[0085] After the wet paper web P1 is separated, the blanket 30 is transported to the stretch roll 46, and further transported in a stretched state to the squeeze roll 47, and squeezed by passing through the squeeze roll 47. The squeezed blanket 30 is transported between the suction cylinder 10 and the couch roll 41, where the pulp slurry PS is transferred again, and the papermaking process S1 is repeated.

[0086] In the drying step S2, before the wet paper P1 passes between the touch roll 43 and the surface of the entry side 51 of the Yankee dryer 50, an adhesive is applied to the surface of the Yankee dryer 50. Specifically, an adhesive supply unit 70 is provided between the entry side 51 of the Yankee dryer 50 and the cleaning doctor blade 90, and the adhesive is sprayed from this adhesive supply unit 70 onto the surface of the Yankee dryer 50. As a result, the adhesive is applied to the surface of the Yankee dryer 50, and a film of adhesive (film F) is formed on the surface of the Yankee dryer 50.

[0087] The adhesive component is not particularly limited, but preferably contains a thermosetting polyamide resin. The thermosetting polyamide resin is heated on the surface of the Yankee dryer 50. At this time, the thermosetting polyamide resin applied to the surface of the Yankee dryer 50 hardens in a portion F1 of the film formed by strong heating near the Yankee dryer 50, and softens in a portion F2 of the film formed by weak heating on the dry paper side away from the Yankee dryer 50 (FIG. 18).

[0088] The thermosetting polyamide resin is not particularly limited, but examples thereof include polyamidepolyamine epichlorohydrin. Polyamidepolyamine epichlorohydrin can control the molecular weight, crosslink density, and cationicity of the resin by controlling the modification with epichlorohydrin, and the thermosetting property can be adjusted by controlling the amount of azetidinium rings (AZR) formed in the resin. Furthermore, adjusting the thermosetting property of the thermosetting polyamide resin can increase the thickness of the adhesive coating layer.

[0089] The amount of adhesive applied to the surface of the Yankee dryer 50 is 0.5 mg / m 2 More than 3.5mg / m 2 or less, preferably 0.8 mg / m 2 More than 3.3mg / m 2 Less than 1 mg / m, more preferably 2 3mg / m or more 2 The following is the result.

[0090] In this embodiment, the amount of adhesive applied is adjusted to 1 to 4 kg / t relative to the mass (t) of the resulting tissue paper P3. In this case, the thickness of the film F formed on the surface of the Yankee dryer 50 is estimated to be 1 to 3.5 μm. The thickness of this film F is approximately five times the thickness of the film formed on the surface of a conventional Yankee dryer 50 (see FIGS. 18 to 21).

[0091] In the drying process S2, the wet paper P1 passes through the hot air hood 60 while adhered to the surface of the Yankee dryer 50 rotating counterclockwise (RD direction), and becomes dry paper P2 by the time it is transported to the outlet side 52 of the Yankee dryer 50.

[0092] In the peeling step S3, the dry paper P2 is transported to the outlet side 52 of the Yankee dryer 50 and peeled off from the Yankee dryer 50 by the creping doctor 80. Specifically, the tip of the creping doctor 80 is placed between the Yankee dryer 50 and the dry paper P2, and the dry paper P2 is separated from the Yankee dryer 50 while forming a crepe.

[0093] The dry paper P2 separated from the Yankee dryer 50 becomes tissue paper P3. The crepe ratio of the tissue paper P3 is arbitrary, but is preferably 10 to 20%.

[0094] The Yankee dryer 50 from which the dry paper P2 has been separated is transported to the cleaning doctor 90 and cleaned. Specifically, the soft film F2 of the film F remaining on the surface of the Yankee dryer 50 is scraped off by the tip of the cleaning doctor 90, leaving only the hard film F1 on the surface of the Yankee dryer 50.

[0095] The cleaned Yankee dryer 50 is conveyed to the inlet side 51 of the Yankee dryer 50, during which time adhesive is again applied to the surface of the Yankee dryer 50, forming a film F. Then, the Yankee dryer 50 with the film F formed on its surface is conveyed to the inlet side 51, where a wet paper web P1 is again adhered to the surface of the Yankee dryer 50, and the drying step S2 is repeated.

[0096] In addition, in conventional tissue paper manufacturing methods, a thin and soft film F3 may be formed on the Yankee dryer 50 (FIG. 19). In this manufacturing method, because the film F3 formed on the surface of the Yankee dryer 50 is thin, the tip of the creping doctor blade 80 comes into contact with the dry paper P2, deteriorating the paper surface quality. In addition, because the film F3 is soft, it easily peels off from the surface of the Yankee dryer 50, resulting in insufficient adhesion of the wet paper P1 or dry paper P2 to the Yankee dryer 50.

[0097] Furthermore, in the conventional tissue paper manufacturing method, a thin and hard film F4 may be formed on the Yankee dryer 50 (FIG. 20). In this manufacturing method, the dry paper P2 is peeled off between the thin and hard film F4 and the dry paper P2, resulting in large crepes, poor surface properties, and hard paper quality.

[0098] Furthermore, in conventional tissue paper manufacturing methods, a hard film F5 and a release layer F6 may be formed on the Yankee dryer 50 (FIG. 21). In this manufacturing method, the release layer F6 makes it easier to peel the dry paper P2 from the Yankee dryer 50, and the crepe becomes smaller, resulting in good surface properties, but the paper quality becomes hard.

[0099] In contrast, in the manufacturing method of this embodiment, as described above, the surface of the Yankee dryer 50 is coated with 0.5 mg / m 2 More than 3.5mg / m 2 By applying the following adhesive, a thick film F can be formed on the surface of the Yankee dryer 50 (FIGS. 17 and 18). This thick film F allows the tip of the creping doctor 80 to enter between the Yankee dryer 50 and the dry paper P2 during the peeling step S3, and the dry paper P2 is peeled off while protecting the surface of the dry paper P2 with the film F. This results in tissue paper with a uniform and fine crepe formed.

[0100] In the manufacturing method of this embodiment, the thick film F formed on the surface of the Yankee dryer 50 prevents the film from being peeled off during the peeling step S3. Creping Doctor 80 This prevents the tip of the dryer from contacting or abutting against the surface of the Yankee dryer 50. Therefore, in the manufacturing method of this embodiment, the surface of the Yankee dryer 50 can be protected by this thick film F.

[0101] In the manufacturing method of this embodiment, the thick film F formed between the surface of the Yankee dryer 50 and the dry paper P2 forms a crepe on the dry paper P2 via the film F as described above. Creping Doctor 80 Since the tip of the blade is unlikely to come into contact with the surface of the Yankee dryer 50, the Yankee dryer 50 itself can also be protected during the peeling step S3.

[0102] In the manufacturing method of this embodiment, the adhesive applied to the surface of the Yankee dryer 50 contains a thermosetting polyamide resin, so that when a thick film F is formed on the surface of the Yankee dryer 50, a portion F1 of the film F hardens due to strong heating near the Yankee dryer 50, and a portion F2 of the film F softens due to weak heating on the side of the dry paper P2 away from the Yankee dryer 50.

[0103] As a result, in the manufacturing method of this embodiment, the soft film F2 formed on the surface of the Yankee dryer 50 makes it easier for the dry paper P2 to adhere, facilitating pickup of the dry paper P2 (adhesion of the wet paper P1 to the Yankee dryer 50) during the drying step S2. In addition, the hard film F1 formed on the surface of the Yankee dryer 50 can enhance protection of the surface of the Yankee dryer 50. [Example]

[0104] The present invention will be described in more detail below with reference to examples. The examples and comparative examples were evaluated by the following tests.

[0105] [Tissue paper (test specimen)] Tissue paper was produced by the production method shown in FIG. 16 (the apparatus 100 shown in FIG. 17) and used as a test specimen.

[0106] [Surface roughness (arithmetic mean height)] Surface roughness was measured using Keyence Corporation's One-Shot 3D Measuring Macroscope VR-3200 and image analysis software "VR-H2A." Measurements were performed at a magnification of 12x and a field of view of 30mm x 30mm. The arithmetic mean height was calculated from the obtained surface roughness. The arithmetic mean height was obtained as the average of the absolute values ​​of the height differences at each point relative to the average plane of the surface.

[0107] [Basic weight (U.S. tsubo)] The basis weight (grams) of tissue paper was measured in accordance with the JIS P 8124 standard. The unit of basis weight is g / m 2 is.

[0108] [Thickness (Paper Thickness)] The thickness of the tissue paper was measured in accordance with the standard JIS P 8111 (1998). The unit of thickness is μm.

[0109] [Dry tensile strength] Dry tensile strength was measured in accordance with JIS P 8113 (1998). Test specimens were cut to approximately 25 mm (±0.5 mm) wide x 150 mm long in both the longitudinal and transverse directions. A tension-compression tester (TG-200N, manufactured by Minebea Co., Ltd.) was used. The measurement was performed by clamping both ends of the test specimen between the grips of the tester with a 100 mm grip distance. A tensile load was applied to the tissue paper piece in the vertical direction, and the digital reading was read when the tissue paper broke. The tensile speed was 100 mm / min. Five sets of specimens were prepared in both the longitudinal and transverse directions, and measurements were taken five times. The average of these measurements was used as the dry tensile strength in each direction. The aspect ratio was calculated as the ratio of the tensile strength in the longitudinal direction to the tensile strength in the transverse direction.

[0110] [Elongation rate] The elongation in the machine direction was measured using a tension and compression tester (TG-200N, manufactured by Minebea Co., Ltd.) The elongation is expressed as a percentage of the length that the tissue paper stretches until it breaks when a tensile load is applied.

[0111] [Proportional limit] Tensile / compression testing machine (MinebeaMitsumi Inc., Technogra centre Using a tension tester (TGE series), a tissue paper 25 mm wide (horizontal direction of the tissue paper) and 140 mm long (vertical direction of the tissue paper) is set 100 mm apart from the chucks and pulled at a speed of 100 mm / min until the tissue paper breaks. At this time, the tissue paper is slackened by about 5 mm in the vertical direction before the tensile load test begins, and the point where stress begins to be applied is taken as the displacement origin. The tensile stress at the proportional limit is the maximum tensile stress in the region where tensile stress and elongation are proportional. The proportional limit displacement rate is calculated from the displacement at the proportional limit and the displacement at break using the above formula (2).

[0112] [Permanent Displacement] Tensile / compression testing machine (MinebeaMitsumi Inc., Technogra centreUsing a tension tester (TGE series), a 25mm wide tissue paper was set 100mm apart and pulled to 150cN and 250cN at a speed of 100mm / min. The load was then removed and the tissue paper displacement was measured at a speed of 20mm / min until the tissue paper had fully recovered. The test was terminated when the tissue paper had fully recovered. The vertical tensile strength of non-moisturizing tissue was approximately 250-450cN, with 150cN being within the proportional limit and 250cN being beyond the proportional limit, so data was measured for these two loads.

[0113] [Spherical compression test] A set of tissue papers that had been conditioned under standard conditions in the JIS P 8111 (1998) environment was gently rolled up in the palms of both hands without crushing, and placed in a 40 cc plastic container and held there for 10 minutes to create 10 tissue paper specimens (tissue paper balls or spherical tissue paper) (Figure 7). The 10 specimens thus prepared were placed in a 500 mL glass beaker. At this time, the specimens were arranged so that they would not be crushed inside the beaker: three in the bottom row, three in the middle row, and four in the top row (Figures 9 and 10). A disk-shaped acrylic plate (82 mm diameter, 20 mm diameter through hole in the center, weight 59.5 g, area 49.67 cm) was placed on top of the 10 tissue papers placed in the beaker. 2) was gently placed on the beaker. The spherical compression test began within 3 minutes of placing the acrylic plate. For the spherical compression test, a timer was placed on the right side of the beaker containing the test specimen, and a push-pull gauge (IMADA, product name "Digital Force Gauge Z2-20N") was lowered at a speed of 0.525 cm / s (Figure 11). The tip of the push-pull gauge was positioned approximately 13.4 cm from the platform on which the beaker was placed. The end point of 200 mL was 5.0 cm from the platform on which the beaker was placed. Ten men and women previously evaluated the softness of the tissue paper when it was rolled up (Figure 12). Eight of the ten subjects selected 20 cc as the size of the spherical tissue paper when squeezed. Therefore, the end point was determined to be 200 mL for 10 balls. The point when the push-pull gauge contacted the acrylic plate and pressure began to be applied was determined as the "initial volume." In this embodiment, the load application started (0.00 cN) when the timer display showed 10.56 seconds. The initial volume was 514.80 cc (Fig. 13). Then, as shown in Fig. 14, when the volume reached 200 mL, the time was 21.38 seconds and the load on the push-pull gauge was -12.37 N (Fig. 14). Next, the spherical compression work was calculated. The tip of the push-pull gauge descends every 0.4 seconds of the timer, with the pushing amount increasing by approximately 0.20 cm. The pushing amount was calculated as L k (cm), and the indentation load F k (kgf). F k is calculated by adding the weight of the acrylic disc (59.5 g) and the load (N) displayed on the push-pull gauge. The spherical compression work W (mJ) was calculated using the following formula (3). From formula (3), when k = 1, L k -L k-1 = 0.215 cm, 1 / 2 × (F1 + F2) = 0.065 kgf, and the work W1 = 1 mJ. Similarly, when k = 2, W2 = 2 mJ. The total work required to reach 200 mL from the initial volume is W = 260 mJ. The work W corresponds to the area under the curve (Figure 15).

[0114] [Extracted oil] The test specimen was immersed in diethyl ether, and the amount of oil extracted (extracted oil) was calculated as a percentage of the weight of the tissue paper.

[0115] [Sensory test] Softness, moistness, smoothness, thickness Feeling, The overall evaluation was performed by calculating the average values ​​of softness, moistness, smoothness, and thickness, and an average value of 4.5 or higher was evaluated as good.

[0116] Examples and comparative examples will be described below.

[0117] [Example 1] Arithmetic mean height 5.5μm, basis weight 12.1g / m 2 The following specimens were evaluated: paper thickness 126 μm, dry tensile strength (longitudinal) 281 cN, dry tensile strength (transverse) 97 cN, elongation (longitudinal) 8.9%, longitudinal tensile stress at proportional limit 205 cN, proportional limit displacement 4.3%, proportional limit displacement rate 48%, 150 cN displacement 3.3%, 150 cN permanent displacement 0.9%, 150 cN permanent displacement rate 26%, 250 cN displacement 4.9%, 250 cN permanent displacement 1.8%, 250 cN permanent displacement rate 37%, initial volume in spherical compression test 515 ml, spherical compression work 260 mJ, and extracted oil content 0.13%. The results are shown in Table 1.

[0118] [Example 2] Arithmetic mean height 3.9μm, basis weight 12.1g / m 2 The following specimens were evaluated: paper thickness 123 μm, dry tensile strength (longitudinal) 312 cN, dry tensile strength (transverse) 136 cN, elongation (longitudinal) 6.6%, longitudinal tensile stress at proportional limit 228 cN, proportional limit displacement 3.2%, proportional limit displacement rate 48%, 150 cN displacement 2.6%, 150 cN permanent displacement 0.6%, 150 cN permanent displacement rate 23%, 250 cN displacement 5.6%, 250 cN permanent displacement 2.2%, 250 cN permanent displacement rate 39%, initial volume in spherical compression test 566 ml, spherical compression work 257 mJ, and extracted oil content 0.12%. The results are shown in Table 1.

[0119] [Example 3] Arithmetic mean height 4.4μm, basis weight 12g / m 2The following specimens were evaluated: paper thickness 130 μm, dry tensile strength (longitudinal) 247 cN, dry tensile strength (transverse) 130 cN, elongation (longitudinal) 8.4%, longitudinal tensile stress at proportional limit 178 cN, proportional limit displacement 5.2%, proportional limit displacement rate 62%, 150 cN displacement 4.7%, 150 cN permanent displacement 1.7%, 150 cN permanent displacement rate 37%, initial volume in spherical compression test 500 ml, spherical compression work 222 mJ, extracted oil content 0.18%. The results are shown in Table 1.

[0120] [Example 4] Arithmetic mean height 6.1μm, basis weight 15g / m 2 The following specimens were evaluated: paper thickness 170 μm, dry tensile strength (longitudinal) 258 cN, dry tensile strength (transverse) 80 cN, elongation (longitudinal) 14.9%, longitudinal tensile stress at proportional limit 169 cN, proportional limit displacement 9%, proportional limit displacement rate 60%, 150 cN displacement 7.9%, 150 cN permanent displacement 3.3%, 150 cN permanent displacement rate 42%, 250 cN displacement 13.6%, 250 cN permanent displacement 7.9%, 250 cN permanent displacement rate 58%, initial volume in spherical compression test 517 ml, spherical compression work 257 mJ, and extracted oil content 0.22%. The results are shown in Table 1.

[0121] [Comparative Example 1] Arithmetic mean height 3.4μm, basis weight 12g / m 2 The following specimens were evaluated: paper thickness 120 μm, dry tensile strength (longitudinal) 272 cN, dry tensile strength (transverse) 123 cN, elongation (longitudinal) 5.6%, longitudinal tensile stress at proportional limit 170 cN, proportional limit displacement 2.7%, proportional limit displacement rate 48%, 150 cN displacement 2.1%, 150 cN permanent displacement 0.4%, 150 cN permanent displacement rate 20%, 250 cN displacement 3.7%, 250 cN permanent displacement 1%, 250 cN permanent displacement rate 27%, initial volume in spherical compression test 585 ml, spherical compression work 339 mJ, and extracted oil content 0.10%. The results are shown in Table 1.

[0122] Comparative Example 2 Arithmetic average height 7.2μm, basis weight 13.4g / m 2The following specimens were evaluated: paper thickness 140 μm, dry tensile strength (longitudinal) 317 cN, dry tensile strength (transverse) 115 cN, elongation (longitudinal) 14.3%, longitudinal tensile stress at proportional limit 155 cN, proportional limit displacement 4%, proportional limit displacement rate 28%, 150 cN displacement 4.2%, 150 cN permanent displacement 1.3%, 150 cN permanent displacement rate 30%, 250 cN displacement 8.1%, 250 cN permanent displacement 3.9%, 250 cN permanent displacement rate 48%, initial volume in spherical compression test 561 ml, spherical compression work 292 mJ, and extracted oil content 0.05%. The results are shown in Table 1.

[0123] Comparative Example 3 Arithmetic mean height 5.7μm, basis weight 13.1g / m 2 The following specimens were evaluated: paper thickness 136 μm, dry tensile strength (longitudinal) 268 cN, dry tensile strength (transverse) 139 cN, elongation (longitudinal) 12.2%, longitudinal tensile stress at proportional limit 167 cN, proportional limit displacement 6.6%, proportional limit displacement rate 55%, 150 cN displacement 6.4%, 150 cN permanent displacement 1.6%, 150 cN permanent displacement rate 26%, 250 cN displacement 10.7%, 250 cN permanent displacement 5.6%, 250 cN permanent displacement rate 53%, initial volume in spherical compression test 576 ml, spherical compression work 306 mJ, and extracted oil content 0.12%. The results are shown in Table 1.

[0124] Comparative Example 4 Arithmetic mean height 4.7μm, basis weight 10.7g / m 2 The following specimens were evaluated: paper thickness 115 μm, dry tensile strength (longitudinal) 464 cN, dry tensile strength (transverse) 130 cN, elongation (longitudinal) 8.8%, longitudinal tensile stress at proportional limit 260 cN, proportional limit displacement 4%, proportional limit displacement rate 46%, 150 cN displacement 2.6%, 150 cN permanent displacement 0.7%, 150 cN permanent displacement rate 26%, 250 cN displacement 3.9%, 250 cN permanent displacement 1%, 250 cN permanent displacement rate 26%, initial volume in spherical compression test 572 ml, spherical compression work 266 mJ, and extracted oil content 0%. The results are shown in Table 1.

[0125] Comparative Example 5 Arithmetic average height 6.2μm, basis weight 11.4g / m2 The following specimens were evaluated: paper thickness 123 μm, dry tensile strength (longitudinal) 520 cN, dry tensile strength (transverse) 130 cN, elongation (longitudinal) 11%, longitudinal tensile stress at proportional limit 226 cN, proportional limit displacement 3.7%, proportional limit displacement rate 33%, 150 cN displacement 2.9%, 150 cN permanent displacement 1%, 150 cN permanent displacement rate 35%, 250 cN displacement 4%, 250 cN permanent displacement 1.4%, 250 cN permanent displacement rate 36%, initial volume in spherical compression test 565 ml, spherical compression work 267 mJ, and extracted oil content 0%. The results are shown in Table 1.

[0126] [Table 1]

[0127] From Table 1, the arithmetic mean height is 3.9 to 6.1 μm and the basis weight is 12 to 15 g / m 2 The paper thickness is 123-170 μm, the dry tensile strength (longitudinal) is 247-312 cN, the dry tensile strength (transverse) is 80-136 cN, the elongation rate (longitudinal) is 6.6-14.9%, the longitudinal tensile stress at the proportional limit is 169-228 cN, the proportional limit displacement is 3.2-9%, the proportional limit displacement rate is 48-62%, the 150 cN displacement is 2.6-7.9%, and the 150 cN permanent displacement is 2.6-7.9%. Tissue papers adjusted to have a viscosity of 0.6 to 3.3%, a permanent displacement at 150 cN of 23 to 42%, a displacement at 250 cN of 4.9 to 13.6%, a permanent displacement at 250 cN of 1.8 to 7.9%, a permanent displacement at 250 cN of 37 to 58%, an initial volume in the spherical compression test of 500 to 566 ml, a spherical compression work load of 222 to 260 mJ, and an extracted oil content of 0.12 to 0.22% had an overall rating of 4.5 or higher (Examples 1 to 4).

[0128] In contrast, tissue papers in which at least any of the arithmetic mean height, dry tensile strength (longitudinal), elongation (longitudinal), longitudinal tensile stress at proportional limit, displacement at proportional limit, displacement rate at proportional limit, displacement at 150 cN, permanent displacement at 150 cN, permanent displacement rate at 150 cN, displacement at 250 cN, permanent displacement at 250 cN, permanent displacement rate at 250 cN, initial capacity in the spherical compression test, and spherical compression work load were outside the ranges of Examples 1 to 4 had an overall rating of less than 4.5 (Comparative Examples 1 to 5).

[0129] Although the embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments, and various modifications and changes are possible within the scope of the invention described in the claims. [Explanation of symbols]

[0130] 1 Bottom row 2 middle row 3 Upper row 100 devices 10 Suction cylinder 20 Pulp slurry supply section 30 Blanket 40 rolls 41 Couch Roll 42 Transport roll 43 Touch Roll 44 Hitch Roll 45 Touch Roll 46 Stretch Roll 47 Squeeze Roll 50 Yankee Dryer 51 Entrance side 52 Exit 60 Hot air hood 70 Adhesive supply section 80 Creping Doctor 90 Cleaning Doctor PS pulp slurry P1 Wet paper P2 dry paper P3 Tissue Paper F F1, F2, F3, F4, F5, F6 film MD Machine direction (tissue paper flow direction) CD: Cross direction (direction perpendicular to the tissue paper flow direction)

Claims

1. Contains fabric softener, The dry tensile strength in the longitudinal direction is 200 cN / 25 mm or more and 312 cN / 25 mm or less, The longitudinal elongation rate is 5% or more and 14.9% or less, The longitudinal tensile stress at the proportional limit is 160 cN or more and 250 cN or less, The proportional limit displacement rate is 40% or more. Tissue paper.

2. The softener contains an oil component extracted with diethyl ether in an amount of 0.1% by mass or more and 0.25% by mass or less. The tissue paper of claim 1.

3. The permanent displacement rate at 150 cN is 21% or more. The tissue paper according to claim 1 or 2.

4. The spherical compression work is 300 mJ or less. The tissue paper according to any one of claims 1 to 3.

5. The arithmetic mean height is 3 μm or more and 7 μm or less. The tissue paper according to any one of claims 1 to 4.

6. A method for producing tissue paper according to any one of claims 1 to 5, a papermaking process in which the pulp slurry containing the softener is made into wet paper; A drying step of drying the wet paper with a Yankee dryer; a peeling step of peeling the dry paper from the Yankee dryer with a creping doctor, 0.5 mg / m on the surface of the Yankee dryer ２ 3.5mg / m or more ２ The following adhesives are applied: A method for manufacturing tissue paper.

7. The adhesive contains a polyamide resin. The method for producing tissue paper according to claim 6.

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