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 a spherical compression work is 300 mJ or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Tissue paper contains a softening agent to make the paper softer. It also has a predetermined tensile strength to prevent tearing (see, for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-182741 [Overview of the project] [Problems that the invention aims to solve]

[0004] In recent years, there has been a growing demand for softer tissue paper. However, increasing the amount of softener added prevents the paper from sticking to the dryer during drying, making it difficult for the crepe to penetrate the paper and thus reducing its softness. Conversely, lowering the tensile strength makes the paper softer but also more prone to tearing. Therefore, there are limitations to how much softer conventional tissue paper can be made.

[0005] The object of this 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 softening agent, having a longitudinal dry tensile strength of 200 cN / 25 mm or more and 400 cN / 25 mm or less, and a spherical compression work of 300 mJ or less.

[0007] In this specification, softeners include components that give flexibility to the paper constituting the tissue paper. The longitudinal direction indicates the direction of fiber flow (or MD direction) during the manufacturing of the tissue paper.

[0008] Dry tensile strength indicates the strength of tissue paper when pulled in a dry state. In this specification, spherical compression work refers to the amount of work done when 10 rolls (sets) of tissue paper, each rolled to approximately the same size under the same conditions, are placed in a predetermined container and compressed until the volume is approximately 200 ml. This spherical compression work indicates an indicator of the softness of the rolled tissue paper.

[0009] In the first embodiment, by including a softening agent while maintaining a vertical dry tensile strength of 200 cN / 25 mm to 400 cN / 25 mm and a spherical compression work of 300 mJ or less, a tissue paper that is tear-resistant and has excellent softness can be obtained.

[0010] A second aspect of the present invention provides tissue paper in which 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 ratio of 40% or more. In this specification, the proportional limit displacement ratio is expressed as a percentage obtained by dividing the displacement of tissue paper subjected to a tensile load when a tensile stress at the proportional limit is applied by the displacement from the time the tensile stress at the proportional limit is applied until fracture.

[0012] Note that a high displacement rate at the proportional limit indicates that the displacement until the tissue paper breaks under the tensile load is large, and the tissue paper has a large amount of elongation and contraction, indicating that the tissue paper is highly elastic. In the third aspect, by setting the displacement rate at the proportional limit to 40% or more, the softness of the tissue paper can be further improved.

[0013] A fourth aspect of the present invention provides a tissue paper having a permanent displacement rate of 21% or more at 150 cN. In this specification, the permanent displacement indicates the elongation that does not return to the original state when the load is removed after applying a constant load. The permanent displacement rate is the percentage of the elongation that does not return to the original state when the load is removed after applying a constant load. The permanent displacement rate at 150 cN indicates the permanent displacement rate under a load of 150 cN.

[0014] Note that when the permanent displacement rate is large when compared under a constant load and the permanent displacement when the load is removed is small, it indicates that the tissue paper has a large amount of return elongation and is soft. In the fourth aspect, by setting the permanent displacement rate at 150 cN to 21% or more, the softness of the tissue paper can be further improved.

[0015] A fifth aspect of the present invention provides a tissue paper having a permanent displacement rate of 30% or more and 60% or less at 250 cN. In this specification, 250 cN indicates the tensile strength of the tissue paper outside the proportional limit. The permanent displacement rate at 250 cN indicates the permanent displacement rate under a load of 250 cN.

[0016] In the fifth aspect, by setting the permanent displacement rate at 250 cN to 30% or more and 60% or less, the softness of the tissue paper can be further improved.

[0017] A sixth aspect of the present invention provides a 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 manufacturing tissue paper according to any of the first to sixth aspects, comprising: a papermaking step of making wet paper by papermaking a pulp slurry to which the softening agent has been added; a drying step of drying the wet paper in a Yankee dryer; and a peeling step of peeling the dry paper from the Yankee dryer with a creping doctor, wherein 0.5 mg / m² is applied to the surface of the Yankee dryer. 2 More than 3.5mg / m 2 The present invention provides a method for manufacturing tissue paper to which the following adhesives are applied.

[0019] In the seventh aspect, 0.5 mg / m² is applied to the surface of the Yankee dryer. 2 More than 3.5mg / m 2 The following adhesive is applied to the surface of the Yankee dryer, forming a thick film. 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 and fine crepe structure.

[0020] Furthermore, in the seventh embodiment, the thick film formed on the surface of the Yankee dryer prevents the tip of the creping doctor from contacting the surface of the Yankee dryer during the stripping process. Therefore, in the seventh embodiment, this thick film can protect the surface of the Yankee dryer.

[0021] Furthermore, in the seventh embodiment, the thick film formed between the surface of the Yankee dryer and the dry paper allows crepes to be formed on the dry paper via the film, as described above, and the tip of the creping doctor is less likely to come into contact with the surface of the Yankee dryer, thus protecting the Yankee dryer itself during the peeling process.

[0022] An eighth aspect of the present invention provides a method for manufacturing 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, a thick film is formed on the surface of the Yankee dryer. Near the Yankee dryer, a portion of the film hardens due to strong heating, while on the dry paper side away from the Yankee dryer, a portion of the film softens due to weaker heating.

[0023] As a result, in the eighth embodiment, the soft film formed on the surface of the Yankee dryer facilitates the adhesion of dry paper, making it easier to pick up the dry paper (adhesion of wet paper to the Yankee dryer) during the drying process. In addition, the hard film formed on the surface of the Yankee dryer enhances the protection of the Yankee dryer's surface. [Effects of the Invention]

[0024] According to one aspect of the present invention, it is possible to provide tissue paper with excellent softness. [Brief explanation of the drawing]

[0025] [Figure 1] This figure shows an image of the surface of tissue paper according to an embodiment of the present invention, measured by image analysis. [Figure 2] This is an illustrative diagram to explain arithmetic mean height. [Figure 3] This figure shows an image of the surface of conventional tissue paper measured using image analysis. [Figure 4] This figure shows images of the surface of conventional tissue paper measured using image analysis. [Figure 5] This graph shows the relationship between the displacement and stress of tissue paper under tensile load. [Figure 6] This graph shows the permanent displacement under a tensile load of 150 cN. [Figure 7] This photograph shows the tissue paper test specimens used in the spherical compression test, housed in a holding container. [Figure 8] This figure shows 10 tissue paper test specimens, used in the spherical compression test, placed in a test container. [Figure 9] Figure 8 is a schematic diagram viewed from the front. [Figure 10] Figure 8 shows the inside of the test container viewed from the top side. (A) shows the test specimens placed only in the lower section, (B) shows the test specimens placed in the lower and middle sections, and (C) shows the test specimens placed in the lower, middle, and upper sections. [Figure 11] This figure shows the test container containing the test specimen set in the compression testing machine (before pressurization begins). [Figure 12] This photograph shows tissue paper test specimens (from left to right: 10cc, 20cc, 35cc, and 50cc) used in spherical compression testing. [Figure 13] Figure 12 is a photograph showing the state at the start of pressurization by the compression testing machine. [Figure 14] Figure 12 is a photograph showing the state during pressurization by a compression testing machine. [Figure 15] This graph shows the relationship between pressure and pressurized volume (indentation amount) in a spherical compression test. [Figure 16] This is a flowchart for carrying out a method for manufacturing tissue paper according to an embodiment of the present invention. [Figure 17] This is a schematic diagram of an apparatus for manufacturing tissue paper according to an embodiment of the present invention. [Figure 18] This is a magnified view of a portion of Figure 17. [Figure 19] This diagram shows part of the conventional tissue paper manufacturing process. [Figure 20] This diagram shows part of the conventional tissue paper manufacturing process. [Figure 21] This diagram shows part of the conventional tissue paper manufacturing process. [Modes for carrying out the invention]

[0026] Embodiments of the present invention will be described in detail with reference to the drawings. In each figure, for common parts, the same reference numerals may be used and the description may be omitted. Also, in each figure, the scales of each member may be different from the actual ones.

[0027] <Tissue paper> The tissue paper according to this embodiment will be described. FIG. 1 is a diagram showing an image obtained by measuring the surface of the tissue paper of this embodiment by image analysis. In this embodiment, the material of the tissue paper is paper. For the pulp composition of the paper, known compositions in paper can be used. For example, the blending ratio of the pulp can be 50% by mass or more, preferably 90% by mass or more, and more preferably 100% by mass.

[0028] Also, the basis weight (also referred to as gsm) of the paper is not particularly limited, and depending on the ply number of the tissue paper, for example, it can be 5 g / m 2 or more and 80 g / m 2 or less, preferably 7 g / m 2 or more and 50 g / m 2 or less, more preferably 9 g / m 2 or more and 20 g / m 2 or less. The basis weight can be measured in accordance with the provisions of JIS P 8124 (2011).

[0029] Also, the thickness of the paper (hereinafter referred to as paper thickness) is not particularly limited, and per 2 plies, it is 50 μm or more and 500 μm or less, preferably 60 μm or more and 330 μm or less, and more preferably 100 μm or more and 200 μm or less. The paper thickness can be measured in accordance with the provisions of JIS P 8111 (1998).

[0030] The form of the tissue paper is not particularly limited, but it is preferably a general-purpose tissue paper (a tissue paper not containing a moisturizing component or a non-moisturizing tissue paper). Also, the use of the tissue paper can be applied to any of industrial, household, and portable uses, but among these, it is preferably used for household tissue paper.

[0031] The tissue paper of this embodiment contains a softener. In this specification, the softener includes components that give flexibility to the paper constituting the tissue paper. Specifically, the softener has the function of widening the spaces between pulp fibers, forming an air layer between the pulp fibers, and also entering the spaces between the pulp fibers, thereby making the pulp fibers less dense and softer the paper. In addition, the softener adhering to the surface of the pulp reduces friction with the skin and gives the paper a smooth feel.

[0032] The ingredients contained in fabric softeners are not particularly limited. Examples of ingredients in fabric softeners include fatty acid ester compounds and fatty acid amide compounds. When using fatty acid ester compounds and fatty acid amide compounds, either one may be used, or both may be used in combination. When using both, the mixing ratio of fatty acid ester compounds and fatty acid amide compounds in the fabric softener is arbitrary, but the content ratio of fatty acid ester compounds to fatty acid amide compounds is preferably 1:1 to 1:5.

[0033] Contains fat The fatty acid ester compound is preferably a compound of an alcohol with 6 to 24 carbon atoms and a fatty acid with 7 to 25 carbon atoms. The alcohol may be a straight-chain alcohol, a branched-chain alcohol, a saturated alcohol, or an unsaturated alcohol. In particular, alcohols with 10 to 22 carbon atoms are preferred, and lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, and oleyl alcohol are preferred.

[0034] Furthermore, the fatty acids having 7 to 25 carbon atoms can be straight-chain fatty acids, branched-chain fatty acids, saturated fatty acids, or unsaturated fatty acids. Among 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 individually or in combination of two or more.

[0035] The fatty acid amide compounds contained in fabric softeners can be obtained by reacting polyalkylene polyamines with carboxylic acids. Preferred polyalkylene polyamines are those having at least three amino groups in the molecule and represented by the following general formula (1).

[0036]

number

[0037] In formula (1), R1 is an alkylene group having 1 to 4 carbon atoms, and n is an integer from 1 to 3. Alkylenepoly In the case of amines, different R1 groups may be present in the molecule. It is also possible to use two or more polyalkylene polyamines. The preferred R1 group is an ethylene group.

[0038] On the other hand, the carboxylic acid is preferably a carboxylic acid having 10 to 24 carbon atoms, and may be either a saturated or unsaturated carboxylic acid. It may also be either a linear or branched carboxylic acid. Among these, carboxylic acids having 12 to 22 carbon atoms are preferred, and carboxylic acids having 14 to 18 carbon atoms are particularly preferred.

[0039] In the tissue paper of this embodiment, the softener preferably contains 0.1% to 0.25% by mass of oil extracted with diethyl ether (hereinafter sometimes referred to as extracted oil), and more preferably 0.12% to 0.22% by mass. Here, diethyl ether efficiently extracts oils and fats, which are low-polarity substances.

[0040] Such oils (oily components) are not normally found in pulp, the main raw material for tissue paper, but are present in fabric softeners. This range of 0.1% to 0.25% by mass for oil content is a high content not seen in conventional tissues, regardless of the basis weight of the tissue paper.

[0041] The tissue paper of this embodiment has a vertical dry tensile strength of 200 cN / 25 mm to 400 cN / 25 mm, preferably 210 cN / 25 mm to 350 cN / 25 mm, and more preferably 220 cN / 25 mm to 300 cN / 25 mm.

[0042] Here, the longitudinal direction indicates the fiber flow direction (or MD direction) during the manufacturing of the tissue paper. The dry tensile strength in the longitudinal direction is the M value of the tissue paper in a dry state. D method This indicates the strength when pulled in the direction of the force.

[0043] Furthermore, in the tissue paper of this embodiment, the dry tensile strength in the transverse direction is arbitrary and is adjusted to, for example, 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.

[0044] Here, the transverse direction refers to the direction perpendicular to the fiber flow direction during the manufacturing of the tissue paper (or the CD direction). The dry tensile strength in the transverse direction indicates the strength when the tissue paper is pulled in the CD direction while dry.

[0045] In the tissue paper of this embodiment, the elongation in the longitudinal direction is arbitrary and is adjusted to, for example, 5% to 20%, preferably 8% to 18%, and more preferably 10% to 15%. Here, the elongation in the longitudinal direction is expressed as a percentage of the length when the tissue paper is pulled in the flow direction of the tissue paper during manufacturing in a dry state and breaks.

[0046] In this embodiment, the tissue paper 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 represents the maximum tensile stress in the region where the stress due to tensile load (tensile stress) and elongation are proportionally related.

[0047] The tensile stress at the proportional limit is, for example, the tensile stress at point B, which is the point where the displacement of the tissue paper due to the tensile load is offset from the proportional line PL, which shows a proportional relationship between the displacement and the stress, as shown in the graph in Figure 5. In Figure 5, A represents the start of the tensile load (displacement origin or 0 point), B represents the proportional limit, and C represents the time of fracture.

[0048] In this embodiment, the tissue paper is preferably adjusted to have a proportional displacement rate of 40% or more, more preferably 42% or more, and even more preferably 45% or more. The upper limit of the proportional displacement rate is not particularly limited and can be adjusted to, for example, 70% or less.

[0049] Here, the proportional limit displacement rate is expressed as a percentage obtained by dividing the displacement of the tissue paper subjected to a tensile load at the proportional limit by the displacement from the time the proportional limit tensile stress is applied until fracture, and is calculated using the following formula (2).

[0050]

number

[0051] Although tissue paper has a crepe structure, this crepe is stretched up to the proportional limit, resulting in significant expansion and contraction of the tissue paper. Beyond the proportional limit, however, the entanglement of the pulp fibers gradually decreases, reducing the expansion and contraction of the tissue paper, and causing it to tend to break.

[0052] From this perspective, a high proportional limit displacement rate indicates that the displacement before the tissue paper breaks under tensile load is large, and that the tissue paper expands and contracts significantly. Furthermore, large expansion and contraction of the tissue paper indicates that many crepes are formed, and that these crepes are formed finely and uniformly, resulting in improved surface quality.

[0053] In this embodiment, the tissue paper is preferably adjusted to have a displacement of 2.4% or more at 150 cN, more preferably 2.5% or more, and even more preferably 2.6% or more. Furthermore, the displacement of 250 cN is preferably adjusted to 4.5% or more at 250 cN, more preferably 4.6% or more, and even more preferably 4.7% or more. Here, displacement refers to the displacement of the tissue paper when a constant load is applied.

[0054] Here, permanent displacement refers to the elongation that does not return to its original state after a constant load has been applied and then removed. A permanent displacement of 150 cN represents the permanent displacement under a load of 150 cN. A permanent displacement of 250 cN represents the permanent displacement under a load of 250 cN.

[0055] Permanent displacement, for example, in the graph shown in Figure 6, represents the displacement that does not return to its original state after a load of 150 cN has been applied and then removed. In Figure 6, D represents the start of tensile load, E represents the time when a load of 150 cN has been applied, and the Y axis of F represents the permanent displacement.

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

[0057] Here, the permanent displacement ratio is the percentage of elongation that does not return to its original state after a constant load has been applied and then removed. The permanent displacement ratio of 150 cN indicates the permanent displacement ratio under a load of 150 cN. The permanent displacement ratio of 250 cN is: 2 This shows the permanent displacement rate under a load of 50 cN.

[0058] Furthermore, a low permanent displacement rate (a rate of permanent displacement when the load is removed, compared to a rate of displacement under a constant load) indicates that the tissue paper will recover more quickly, suggesting that the tissue paper is softer.

[0059] In this embodiment, the spherical compression work of the tissue paper is preferably adjusted to be 300 mJ or less, more preferably 290 mJ or less, and even more preferably 260 mJ or less. Here, the spherical compression work is the amount of work done when 10 rolls (sets) of tissue paper, each rolled to approximately the same size under the same conditions, are placed in a predetermined container and compressed until the volume is approximately 200 ml.

[0060] This spherical compression work indicates the softness of a rolled-up tissue paper. Specifically, the spherical compression work can be measured by the spherical compression test shown in Figures 7 to 14.

[0061] First, one set of tissue paper, humidified under standard conditions as specified in JIS P 8111 (1998), is gently rolled into a ball between the palms of both hands without crushing it, and then placed in a 40cc plastic container and held for 10 minutes to create a tissue paper test specimen (a ball of tissue paper or a spherical tissue paper) (Figure 7). In this embodiment, 10 such test specimens are prepared.

[0062] Next, the 10 test samples were placed in a 500 mL glass beaker, ensuring they were evenly distributed within the beaker (Figure 8). Specifically, as shown in Figures 9 and 10, three test samples (spherical tissue paper) were placed in the bottom layer 1, three in the middle layer 2, and four in the top layer 3, without crushing them.

[0063] A disc-shaped acrylic plate (82mm in diameter, with a 20mm diameter through-hole in the center, weighing 59.5g, with an area of ​​49.67cm²) was placed on top of 10 tissue papers inside a beaker. 2 Place it gently.

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

[0065] Prior to the experiment, 10 men and women evaluated the softness of rolled-up tissue paper (Figure 12). Eight out of the 10 participants selected 20cc as the ideal size for a spherical tissue paper ball when squeezed. Therefore, 200mL was considered the endpoint for the experiment, consisting of 10 balls.

[0066] In the spherical compression test, as shown in Figure 13, the "initial volume" was defined as the point when the push-pull gauge contacted the acrylic disc and began to apply pressure. In this embodiment, the load was started (0.00 cN) when the timer display showed 10.56 seconds. The initial volume was 514.80 cc. Then, as shown in Figure 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.

[0067] Next, we determine the work done by spherical compression. The tip of the push-pull gauge descends approximately every 0.4 seconds, with each indentation being about 0.20 cm. The indentation is L. k (cm) and the indentation load F k Let (kgf) be F k The calculation is performed by adding the weight of the acrylic disc (59.5g) and the load (N) indicated on the push-pull gauge. The spherical compression work W (mJ) is calculated by the following formula (3).

[0068]

number

[0069] From equation (3), when k=1, Lk -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 done from the initial volume to 200 mL (spherical compression work) is W = 260 mJ. The work 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 or more and 7 μm or less, more preferably 4 μm or more and 6.5 μm or less, and even more preferably 5 μm or more and 6 μm or less. Here, the arithmetic mean height represents the average of the absolute differences in height of each point relative to the average plane of the surface (see Figure 2).

[0071] In contrast, conventional tissue paper has areas where crepes are not formed, as shown in Figure 3, resulting in a flat surface with minimal irregularities, or, as shown in Figure 4, large and uneven crepes. Therefore, conventional tissue paper tends to have little stretch and feel stiff, limiting the potential for improvement in softness and smoothness.

[0072] In contrast, the tissue paper of this embodiment, as shown in Figure 1, has a uniform and fine crepe structure, is highly stretchable, and feels soft. To obtain these effects, in this embodiment, as described above, while containing a softening agent, the dry tensile strength in the longitudinal direction is set to 200 cN / 25 mm or more and 400 cN / 25 mm or less, and the spherical compression work is set to 300 mJ or less. As a result, in this embodiment, a tissue paper that is tear-resistant and has excellent softness is obtained.

[0073] In the tissue paper of this embodiment, as described above, the inclusion of 0.1% to 0.25% by mass of oil extracted with diethyl ether (softener) improves the softness of the tissue paper.

[0074] In the tissue paper of this embodiment, as described above, the softness of the tissue paper can be further improved by setting the proportional limit displacement rate to 40% or more.

[0075] In this embodiment of tissue paper, as described above, the softness of the tissue paper can be further improved by setting the permanent displacement rate of 150 cN to 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 permanent displacement rate of 250 cN to 30% or more and 60% 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 3 μm or more and 7 μm or less.

[0078] <How to manufacture tissue paper> A method for manufacturing tissue paper according to this embodiment will now be described. Figure 16 is a flowchart showing the method for manufacturing tissue paper according to this embodiment. Figure 17 is a schematic diagram of the apparatus for manufacturing tissue paper according to this embodiment, and Figure 18 is an enlarged view of a part of Figure 17. In addition, parts common to each figure may be denoted by the same reference numerals and their descriptions 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 (Figure 16). Note that the tissue paper manufacturing method according to this embodiment is an example of the tissue paper manufacturing method according to the present invention.

[0080] The tissue paper manufacturing method according to this embodiment can be realized, for example, by the tissue paper manufacturing apparatus 100 shown in Figure 17. The apparatus 100 shown in Figure 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 tissue paper manufacturing method shown in Figure 16 will be specifically described using the apparatus 100 shown in Figure 17.

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

[0082] The supplied pulp slurry PS is transferred to the blanket 30 as it passes between the suction cylinder 10 and the cutty roll 41. The pulp slurry PS transferred to the blanket 30 is dewatered as it is transported to the touch roll 43, becoming wet paper P1.

[0083] In drying step S2, the wet paper P1 is dried in a Yankee dryer 50 to become dry paper P2. As the wet paper P1 passes between the mutually rotating touch rolls 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] After the wet paper P1 is separated from the blanket 30, it is transported to the hitch roll 44, then 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 adheres to the surface of the Yankee dryer 50.

[0085] After the wet paper P1 is separated, the blanket 30 is transported to the stretch roll 46, stretched, and then transported to the squeeze roll 47, where it is compressed as it passes through the squeeze roll 47. The compressed blanket 30 is then transported between the suction cylinder 10 and the cutty roll 41, to which the pulp slurry PS is transferred again, and the papermaking process S1 is repeated.

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

[0087] Furthermore, the components of the adhesive are not particularly limited, but preferably contain 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 part F1 of the film formed by strong heating near the Yankee dryer 50, while softens in part F2 of the film formed by weaker heating on the dry paper side away from the Yankee dryer 50 (Figure 18).

[0088] The thermosetting polyamide resin is not particularly limited, but examples include polyamide polyamine epichlorohydrin. The molecular weight, crosslinking density, and cationic properties of polyamide polyamine epichlorohydrin can be controlled by controlling the modification by epichlorohydrin, and the thermosetting properties can be adjusted by controlling the amount of azetidinium rings (AZR) formed in the resin. Furthermore, by adjusting the thermosetting properties of the thermosetting polyamide resin, the thickness of the adhesive coating layer can be increased.

[0089] The amount of adhesive applied to the surface of the Yankee Dryer 50 is 0.5 mg / m² relative to the surface of the Yankee Dryer 50. 2 More than 3.5mg / m 2 The following, preferably 0.8 mg / m² 2 More than 3.3mg / m 2 More preferably, 1 mg / m² 2 3mg / m or more 2 The following applies:

[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. At this time, the thickness of the film F formed on the surface of the Yankee dryer 50 is estimated to be 1 to 3.5 μm. This film thickness F is approximately five times the thickness of the film formed on the surface of a conventional Yankee dryer 50 (see Figures 18 to 21).

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

[0092] In the peeling process S3, the dry paper P2 is transported to the outlet 52 of the Yankee dryer 50 and peeled off 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 a crepe is formed.

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

[0094] The Yankee dryer 50, from which the dry paper P2 has separated, is then transported to the cleaning doctor 90 for cleaning. Specifically, the softer 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] As the cleaned Yankee dryer 50 is being transported to the inlet side 51, adhesive is applied again to the surface of the Yankee dryer 50, forming a film F. The Yankee dryer 50 with the film F formed on its surface is then transported to the inlet side 51, where wet paper P1 is again adhered to the surface of the Yankee dryer 50, and the drying process S2 is repeated.

[0096] In conventional tissue paper manufacturing methods, a thin, soft film F3 may be formed on the Yankee dryer 50 (Figure 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 80 comes into contact with the dry paper P2, degrading the surface quality of the paper. Also, because the film F3 is soft, it easily peels off 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 conventional tissue paper manufacturing methods, a thin, hard film F4 may form on the Yankee dryer 50 (Figure 20). In this manufacturing method, the dry paper P2 is peeled off between the thin, hard film F4 and the dry paper P2, resulting in larger crepes, poor surface quality, and a harder paper texture.

[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 (Figure 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 surface quality improves as the crepe becomes smaller, but the paper quality becomes harder.

[0099] In contrast, in the manufacturing method of this embodiment, as described above, 0.5 mg / m² is applied to the surface of the Yankee dryer 50. 2 More than 3.5mg / m 2 The following adhesive is applied to the surface of the Yankee dryer 50, allowing a thick film F to form (Figures 17 and 18). This thick film F allows the tip of the creping doctor 80 to penetrate between the Yankee dryer 50 and the dry paper P2 during the peeling process S3, protecting the surface of the dry paper P2 with the film F while the dry paper P2 is peeled off. This results in tissue paper with a uniform and fine crepe structure.

[0100] Furthermore, in the manufacturing method of this embodiment, the thick film F formed on the surface of the Yankee dryer 50 during the peeling process S3 Creping Doctor 80 This prevents the tip from contacting or abutting 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 coating F.

[0101] Furthermore, in the manufacturing method of this embodiment, a thick film F is formed between the surface of the Yankee dryer 50 and the dry paper P2, and as described above, a crepe is formed on the dry paper P2 via the film F. Creping Doctor 80 Since the tip of the tool is less likely to come into contact with the surface of the Yankee dryer 50, the Yankee dryer 50 itself can also be protected during the peeling process 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. 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, while a portion F2 of the film F softens due to weaker heating on the dry paper P2 side 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, and the picking up of the dry paper P2 (adhesion of the wet paper P1 to the Yankee dryer 50) during the drying process S2 becomes easier. In addition, the hard film F1 formed on the surface of the Yankee dryer 50 enhances the protection of the surface of the Yankee dryer 50. [Examples]

[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 manufactured using the manufacturing method shown in Figure 16 (apparatus 100 in Figure 17), and this was used as a test specimen.

[0106] [Surface roughness (arithmetic mean height)] Surface roughness was measured using a Keyence Corporation VR-3200 one-shot 3D measuring microscope and the image analysis software "VR-H2A". The measurement was performed under conditions of 12x magnification 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 difference between each point relative to the average surface plane.

[0107] [Basic weight (U.S. tsubo)] The basis weight (grammage per square meter) of the tissue paper was measured in accordance with the provisions of JIS P 8124. The unit of basis weight is g / m². 2 That is the case.

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

[0109] [Dry Tensile Strength] The dry tensile strength was measured in accordance with the provisions of JIS P 8113 (1998). Test specimens were cut to approximately 25 mm (±0.5 mm) in width and 150 mm in length in both the longitudinal and transverse directions. A tensile-compression testing machine (Minebea Co., Ltd., TG-200N) was used. The measurement procedure involved setting the grip distance to 100 mm, clamping both ends of the test specimen to the machine's grips, applying a tensile load to the tissue paper in the vertical direction, and reading the indicated value (digital value) when the tissue paper broke. The tensile speed was set to 100 mm / min. Five sets of samples were prepared for both the longitudinal and transverse directions, and each was measured five times. The average of these measurements was taken as the dry tensile strength in each direction. The aspect ratio was calculated as the ratio of the longitudinal tensile strength to the transverse tensile strength.

[0110] [Growth rate] The longitudinal elongation was measured using a tensile and compression testing machine (Minebea Co., Ltd., TG-200N). The elongation is expressed as a percentage of the length the tissue paper stretches until it breaks when a tensile load is applied.

[0111] [Proportional limit] Tensile and Compression Testing Machine (Manufactured by MinebeaMitsumi Inc., Technogra) centre Using the TGE series, a tissue paper measuring 25 mm in width (horizontal direction) and 140 mm in length (longitudinal direction) is set 100 mm apart in the chucks and pulled at a speed of 100 mm / min until the tissue paper breaks. At this time, the tensile load test is started with the tissue paper slackening by about 5 mm in the longitudinal direction, and the point at which stress begins to be applied is defined as the displacement origin. The tensile stress at the proportional limit is defined as the maximum tensile stress in the region where tensile stress and elongation are proportional. The proportional limit displacement rate is determined from the displacement at the proportional limit and the displacement at break using the above equation (2).

[0112] [Permanent displacement] Tensile and Compression Testing Machine (Manufactured by MinebeaMitsumi Inc., Technogra) centreUsing the TGE series, a 25mm wide tissue paper was set 100mm apart and pulled at a speed of 100mm / min to 150cN and 250cN. After that, with no load, the displacement of the tissue paper was measured at a speed of 20mm / min until the tissue paper's elongation was fully restored, at which point the test was terminated. Note that non-moisturizing tissue has a tensile strength of approximately 250-450cN, and since 150cN is within the proportional limit and 250cN is beyond the proportional limit, data for these two load levels was measured.

[0113] [Spherical Compression Test] Ten tissue paper test specimens (tissue paper balls or spherical tissue paper) are prepared by gently rolling a set of tissue paper, which has been humidified under standard conditions as specified in JIS P 8111 (1998), between the palms of both hands without crushing it, and holding it in a 40cc plastic container for 10 minutes (Figure 7). The ten prepared test specimens are placed in a 500mL glass beaker. At this time, the test specimens are arranged so that they are not crushed in the beaker, with 3 in the bottom layer, 3 in the middle layer, and 4 in the top layer (Figures 9 and 10). A disc-shaped acrylic plate (82mm in diameter, with a 20mm diameter through-hole in the center, weighing 59.5g, with an area of ​​49.67cm²) is placed on top of the ten tissue paper specimens in the beaker. 2Gently place the acrylic plate on top. Within 3 minutes of placing the acrylic plate, begin the spherical compression test. In the spherical compression test, place a timer to the right of the beaker containing the test specimen and lower a push-pull gauge (IMADA Corporation, product name "Digital Force Gauge Z2-20N") at a speed of 0.525 cm / second (Figure 11). The tip of the push-pull gauge is approximately 13.4 cm from the stand on which the beaker is placed. The endpoint of 200 mL is 5.0 cm from the stand on which the beaker is placed. Prior to the test, 10 men and women evaluated the softness of rolled-up tissue paper (Figure 12). At that time, 8 out of 10 people selected 20 cc as the size of the spherical tissue paper when squeezed. Therefore, 200 mL was set as the endpoint with 10 balls. Next, the "initial volume" was defined as the point when the push-pull gauge made contact with the acrylic disc and began to pressurize. In this embodiment, the load was started (0.00 cN) when the timer display showed 10.56 seconds. The initial volume was 514.80 cc (Figure 13). Then, as shown in Figure 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 (Figure 14). Next, the work of spherical compression was determined. The tip of the push-pull gauge descends for every 0.4 seconds of timer time and every 0.20 cm of indentation. The indentation amount is Lk (cm), and the indentation load is F. k Let (kgf) be F k The calculation is performed by adding the weight of the acrylic disc (59.5g) and the load (N) indicated on the push-pull gauge. The work of spherical compression W (mJ) was calculated using the following equation (3). From equation (3), when k=1, Lk-Lk-1=0.215cm, 1 / 2×(F1+F2)=0.065kgf, and the work W1=1mJ. Similarly, when k=2, W2=2mJ. The total work done from the initial volume to 200mL is work W=260mJ. 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 extracted oil (extracted oil) was calculated as a percentage of the weight of the tissue paper.

[0115] [Sensory testing] Softness, moistness, smoothness, thickness Feeling, A comprehensive evaluation was then conducted based on these factors. The overall evaluation calculated the average value of softness, moistness, smoothness, and thickness, and a value of 4.5 or higher was considered good.

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

[0117] [Example 1] Arithmetic mean height 5.5 μm, basis weight 12.1 g / m² 2 A specimen was evaluated using paper with a thickness of 126 μm, dry tensile strength (longitudinal) of 281 cN, dry tensile strength (transverse) of 97 cN, elongation (longitudinal) of 8.9%, longitudinal tensile stress at the proportional limit of 205 cN, displacement at the proportional limit of 4.3%, displacement rate at the proportional limit of 48%, displacement at 150 cN of 3.3%, permanent displacement at 150 cN of 0.9%, permanent displacement rate at 150 cN of 26%, displacement at 250 cN of 4.9%, permanent displacement at 250 cN of 1.8%, permanent displacement rate at 250 cN of 37%, initial volume in the spherical compression test of 515 ml, spherical compression work of 260 mJ, and extracted oil content of 0.13%. The results are shown in Table 1.

[0118] [Example 2] Arithmetic mean height 3.9 μm, basis weight 12.1 g / m² 2 A specimen was evaluated with a paper thickness of 123 μm, dry tensile strength (longitudinal) of 312 cN, dry tensile strength (transverse) of 136 cN, elongation (longitudinal) of 6.6%, longitudinal tensile stress at the proportional limit of 228 cN, displacement at the proportional limit of 3.2%, displacement rate at the proportional limit of 48%, displacement at 150 cN of 2.6%, permanent displacement at 150 cN of 0.6%, permanent displacement rate at 150 cN of 23%, displacement at 250 cN of 5.6%, permanent displacement at 250 cN of 2.2%, permanent displacement rate at 250 cN of 39%, initial volume in the spherical compression test of 566 ml, spherical compression work of 257 mJ, and extracted oil content of 0.12%. The results are shown in Table 1.

[0119] [Example 3] Arithmetic mean height 4.4 μm, basis weight 12 g / m² 2Test specimens were evaluated using paper with a thickness of 130 μm, dry tensile strength (longitudinal) of 247 cN, dry tensile strength (transverse) of 130 cN, elongation (longitudinal) of 8.4%, longitudinal tensile stress at the proportional limit of 178 cN, displacement at the proportional limit of 5.2%, displacement rate at the proportional limit of 62%, displacement at 150 cN of 4.7%, permanent displacement at 150 cN of 1.7%, and permanent displacement rate at 150 cN of 37%. The initial volume for the spherical compression test was 500 ml, the work of spherical compression was 222 mJ, and the extracted oil content was 0.18%. The results are shown in Table 1.

[0120] [Example 4] Arithmetic mean height 6.1 μm, basis weight 15 g / m² 2 A specimen was evaluated using paper with a thickness of 170 μm, dry tensile strength (longitudinal) of 258 cN, dry tensile strength (transverse) of 80 cN, elongation (longitudinal) of 14.9%, longitudinal tensile stress at the proportional limit of 169 cN, displacement at the proportional limit of 9%, displacement rate at the proportional limit of 60%, displacement at 150 cN of 7.9%, permanent displacement at 150 cN of 3.3%, permanent displacement rate at 150 cN of 42%, displacement at 250 cN of 13.6%, permanent displacement at 250 cN of 7.9%, permanent displacement rate at 250 cN of 58%, initial volume in the spherical compression test of 517 ml, spherical compression work of 257 mJ, and extracted oil content of 0.22%. The results are shown in Table 1.

[0121] [Comparative Example 1] Arithmetic mean height 3.4 μm, basis weight 12 g / m² 2 Test specimens were evaluated using paper with a thickness of 120 μm, dry tensile strength (longitudinal) of 272 cN, dry tensile strength (transverse) of 123 cN, elongation (longitudinal) of 5.6%, longitudinal tensile stress at the proportional limit of 170 cN, displacement at the proportional limit of 2.7%, displacement rate at the proportional limit of 48%, displacement at 150 cN of 2.1%, permanent displacement at 150 cN of 0.4%, permanent displacement rate at 150 cN of 20%, displacement at 250 cN of 3.7%, permanent displacement at 250 cN of 1%, permanent displacement rate at 250 cN of 27%, initial volume in the spherical compression test of 585 ml, spherical compression work of 339 mJ, and extracted oil content of 0.10%. The results are shown in Table 1.

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

[0123] [Comparative Example 3] Arithmetic mean height 5.7 μm, basis weight 13.1 g / m² 2 A specimen was evaluated with a paper thickness of 136 μm, dry tensile strength (longitudinal) of 268 cN, dry tensile strength (transverse) of 139 cN, elongation (longitudinal) of 12.2%, longitudinal tensile stress at the proportional limit of 167 cN, displacement at the proportional limit of 6.6%, displacement rate at the proportional limit of 55%, displacement at 150 cN of 6.4%, permanent displacement at 150 cN of 1.6%, permanent displacement rate at 150 cN of 26%, displacement at 250 cN of 10.7%, permanent displacement at 250 cN of 5.6%, permanent displacement rate at 250 cN of 53%, initial volume in the spherical compression test of 576 ml, spherical compression work of 306 mJ, and extracted oil content of 0.12%. The results are shown in Table 1.

[0124] [Comparative Example 4] Arithmetic mean height 4.7 μm, basis weight 10.7 g / m² 2 A specimen was evaluated using paper with a thickness of 115 μm, dry tensile strength (longitudinal) of 464 cN, dry tensile strength (transverse) of 130 cN, elongation (longitudinal) of 8.8%, longitudinal tensile stress at the proportional limit of 260 cN, displacement at the proportional limit of 4%, displacement rate at the proportional limit of 46%, displacement at 150 cN of 2.6%, permanent displacement at 150 cN of 0.7%, permanent displacement rate at 150 cN of 26%, displacement at 250 cN of 3.9%, permanent displacement at 250 cN of 1%, permanent displacement rate at 250 cN of 26%, initial volume in the spherical compression test of 572 ml, spherical compression work of 266 mJ, and extracted oil content of 0%. The results are shown in Table 1.

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

[0126] [Table 1]

[0127] Table 1 shows that the arithmetic mean height is 3.9–6.1 μm, and the basis weight is 12–15 g / m². 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 (longitudinal) is 6.6-14.9%, the longitudinal tensile stress at the proportional limit is 169-228 cN, the displacement at the proportional limit is 3.2-9%, the displacement rate at the proportional limit is 48-62%, the displacement at 150 cN is 2.6-7.9%, and the permanent displacement at 150 cN is 150 cN. Tissue paper adjusted to 0.6-3.3%, a permanent displacement rate of 23-42% at 150 cN, a displacement of 4.9-13.6% at 250 cN, a permanent displacement of 1.8-7.9% at 250 cN, a permanent displacement rate of 37-58% at 250 cN, an initial volume of 500-566 ml in the spherical compression test, a spherical compression work of 222-260 mJ, and an extracted oil content of 0.12-0.22% received an overall evaluation of 4.5 or higher (Examples 1-4).

[0128] In contrast, tissue papers in which at least one of the following parameters—arithmetic mean height, dry tensile strength (longitudinal), elongation (longitudinal), longitudinal tensile stress at the proportional limit, displacement at the proportional limit, displacement rate at the 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 volume in the spherical compression test, and spherical compression work—fell outside the range of Examples 1-4, resulting in an overall evaluation of less than 4.5 (Comparative Examples 1-5).

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

[0130] 1. Lower section 2 middle row 3 Upper section 100 devices 10 Suction Cylinder 20 Pulp Slurry Supply Unit 30 blankets 40 rolls 41 Cooch Roll 42 Conveyor Rolls 43 Touch Roll 44 Hitch Roll 45 Touch Roll 46 Stretch Roll 47 Squeeze Roll 50 Yankee Hair Dryer 51 Entrance side 52 Outbound side 60 Hot air hood 70 Adhesive supply unit 80 Creping Doctor 90 Cleaning Doctor PS Pulp Sally P1 Wet paper P2 dry paper P3 Tissue Paper F F1, F2, F3, F4, F5, F6 film MD vertical direction (direction of tissue paper flow) CD horizontal direction (direction perpendicular to the flow direction of tissue paper)

Claims

1. Contains fabric softener, The paper thickness is 100 μm or more and 200 μm or less. Basis weight: 9 g / m² ２ 15g / m or more ２ The following: The dry tensile strength in the longitudinal direction is 200 cN / 25 mm or more and 400 cN / 25 mm or less. The work done by spherical compression is 300 mJ or less. The proportional limit displacement rate is 40% or more. Tissue paper.

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

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

4. The permanent displacement rate of 250 cN is between 30% and 60%. The tissue paper according to any one of claims 1 to 3.

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

6. A method for manufacturing tissue paper according to any one of claims 1 to 5, A papermaking process in which the pulp slurry to which the softening agent has been added is made into wet paper, The aforementioned wet paper is dried using a Yankee dryer, The process includes a peeling step of peeling the dry paper from the Yankee dryer with a creping doctor, 0.5 mg / m² on the surface of the aforementioned 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 manufacturing tissue paper according to claim 6.

Images