Paper towel and method for manufacturing the same

Abstract

A tissue paper contains a softening agent, has a longitudinal dry tensile strength of 250 cN / 25 mm or more and 400 cN / 25 mm or less, a tensile elastic modulus of 7 N / mm<supgt;2< / supgt; or more and 15 N / mm<supgt;2< / supgt; or less, and a handle value HF measured by a softness measuring device TSA of 80 or more.

Description

Technical Field

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

[0002] In recent years, the demand for soft tissue paper has been increasing. The tissue paper contains a softening agent to make the paper soft. In addition, it has a specified tensile strength so that the paper does not break (for example, refer to Patent Document 1).

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2020-182741 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] In the case of conventional tissue paper, if the addition amount of the softening agent is increased, the paper does not stick to the dryer during drying, and wrinkles do not easily enter the paper, but instead, it does not become soft. In addition, if the tensile strength is decreased, the paper becomes soft but easily breaks. Therefore, there are limitations in improving the softness of conventional tissue paper.

[0008] An object of the present invention is to provide tissue paper having excellent softness.

[0009] Means for Solving the Problems

[0010] The tissue paper according to one embodiment of the present invention contains a softening agent, has a longitudinal dry tensile strength of 250 cN / 25 mm or more and 400 cN / 25 mm or less, a tensile elastic modulus of 7 N / mm 2 or more and 15 N / mm 2 or less, and a hand feeling value HF measured by a softness measuring device TSA of 80 or more.

[0011] Effects of the Invention

[0012] According to one embodiment of the present invention, it is possible to provide tissue paper having excellent softness. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a diagram showing an image of the surface of the tissue paper according to the embodiment of the present invention measured by image analysis.

[0014] Figure 2 It is an image diagram for explaining the arithmetic mean height.

[0015] Figure 3 It is an image diagram for explaining the aspect ratio of the surface properties.

[0016] Figure 4 It shows Figure 1Schematic diagram of the cross-section of the flow direction of the tissue paper in

[0017] Figure 5 It is a figure showing an image of the surface of a conventional tissue paper measured by image analysis.

[0018] Figure 6 It shows Figure 5 Schematic diagram of the cross-section of the flow direction of the tissue paper in

[0019] Figure 7 It shows Figure 5 Schematic diagram of the cross-section of the flow direction of the tissue paper in

[0020] Figure 8 It is a figure showing the tensile elastic modulus of the tissue paper related to the embodiment of the present invention.

[0021] Figure 9 It is a figure showing the tensile elastic modulus of a conventional tissue paper.

[0022] Figure 10 It is a flowchart showing a method for manufacturing a tissue paper related to the embodiment of the present invention.

[0023] Figure 11 It is a schematic diagram of a device for manufacturing a tissue paper related to the embodiment of the present invention.

[0024] Figure 12 It is an enlarged Figure 11 Figure of a part of the device shown.

[0025] Figure 13 It is a figure showing a part of a device for manufacturing a conventional tissue paper.

[0026] Figure 14 It is a figure showing a part of a device for manufacturing a conventional tissue paper.

[0027] Figure 15 It is a figure showing a part of a device for manufacturing a conventional tissue paper. Detailed Description of the Preferred Embodiments

[0028] The embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in each figure, the same reference numerals are sometimes used to denote common parts, and the description thereof is omitted. In addition, in each figure, the scale of each component may be different from the actual one.

[0029] <Tissue Paper>

[0030] The tissue paper related to this embodiment will be described. Figure 1This is a diagram showing an image of the surface of the tissue paper of the present embodiment measured by image analysis. In the present embodiment, the material of the tissue paper is paper. The pulp composition of the paper can be a composition well-known in the art of paper. 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%.

[0031] In addition, the basis weight (also known as the grammage) of the paper is not particularly limited and, depending on the number of layers of the tissue paper, is, for example, 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, and more preferably 10 g / m 2 or more and 13 g / m 2 or less. In addition, the basis weight can be measured in accordance with the provisions of JIS P 8124.

[0032] In addition, the thickness of the paper (hereinafter referred to as the paper thickness) is not particularly limited. For example, for every two layers, 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 150 μm or less. The paper thickness can be measured in accordance with the provisions of JIS P8111 (1998).

[0033] Although not particularly limited, the form of the tissue paper is preferably a general tissue paper (excluding tissue paper containing a moisturizing component). In addition, the use of the tissue paper can be applied to industrial, household, or portable use, and it is also preferably used for household tissue paper.

[0034] The tissue paper of the present embodiment contains a softening agent. In this specification, the softening agent contains a component that provides softness to the paper constituting the tissue paper. Specifically, the softening agent has the function of widening the space between pulp fibers, forming an air layer between the pulp fibers, and can also enter between the pulp fibers to loosen the pulp fibers and make the paper softer. The softening agent reduces the friction with the skin by adhering to the surface of the pulp, making the paper smooth.

[0035] The components contained in the softening agent are not particularly limited, and examples thereof include fatty acid ester compounds and fatty acid amide compounds. When using fatty acid ester compounds and fatty acid amide compounds, either one can be used, or both can be used simultaneously. In addition, when using both, the blending ratio of the fatty acid ester compound and the fatty acid amide compound in the softening agent is arbitrary, but the content ratio of the fatty acid ester compound and the fatty acid amide compound is preferably 1:1 to 1:5.

[0036] The fatty acid ester compound contained in the softening agent is preferably a compound of an alcohol having 6 to 24 carbon atoms and a fatty acid having 7 to 25 carbon atoms.

[0037] The alcohol having 6 to 24 carbon atoms can be any of a straight-chain alcohol, a branched-chain alcohol, a saturated alcohol, and an unsaturated alcohol. Among them, 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 more preferred. These alcohols can be used singly or in combination of two or more.

[0038] In addition, the fatty acid having 7 to 25 carbon atoms can be any of a straight-chain fatty acid, a branched-chain fatty acid, a saturated fatty acid, and an unsaturated fatty acid. Among them, a fatty acid having 10 to 22 carbon atoms is preferred, and lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, and oleic acid are more preferred. These fatty acids can be used singly or in combination of two or more.

[0039] The fatty acid amide compound contained in the softener can be obtained by the reaction of a polyalkylene polyamine and a carboxylic acid. The suitable polyalkylene polyamine is the polyalkylene polyamine represented by the following general formula (1) having at least 3 amino groups in the molecule.

[0040] H2N-(R1-NH-) n -R1-NH2···(1)

[0041] (R1 is each independently an alkylene group having 1 to 4 carbon atoms, and n is an integer of 1 to 3)

[0042] In this polyalkylene polyamine, different R1s can exist in the molecule. In addition, two or more polyalkylene polyamines can also be used. Preferred R1 is ethylene.

[0043] On the other hand, as the carboxylic acid, a carboxylic acid having 10 to 24 carbon atoms is preferred, and it can be any of a saturated carboxylic acid and an unsaturated carboxylic acid. In addition, it can also be a straight-chain carboxylic acid or a branched-chain carboxylic acid. Among them, a carboxylic acid having 12 to 22 carbon atoms is preferred, and a carboxylic acid having 14 to 18 carbon atoms is more preferred.

[0044] In the tissue paper of the present embodiment, the softener preferably contains 0.1% by mass or more and 1.5% by mass or less of the oil component extracted with diethyl ether (hereinafter sometimes referred to as the extracted oil component), more preferably 0.1% by mass or more and 1.4% by mass or less, and still more preferably 0.1% by mass or more and 1.3% by mass or less. Among them, diethyl ether effectively extracts the oil as a low-polarity substance.

[0045] Such an oil component (oily component) is generally not contained in the pulp which is the main raw material of the tissue paper, but is contained in the softener. The content of this oil component in the range of 0.1% by mass or more and 1.5% by mass or less is a high content not seen in the conventional tissue paper regardless of the basis weight per unit area of the tissue paper.

[0046] The longitudinal dry tensile strength of the tissue paper of this embodiment is 250 cN / 25 mm or more and 400 cN / 25 mm or less, preferably 260 cN / 25 mm or more and 380 cN / 25 mm or less, more preferably 270 cN / 25 mm or more and 350 cN / 25 mm or less.

[0047] Here, the longitudinal direction indicates the flow direction (MD direction) during the manufacture of the tissue paper ( Figure 1 , Figure 4 ). In addition, the longitudinal dry tensile strength indicates the strength when the tissue paper is stretched in the flow direction (MD direction) in the dry state during manufacture.

[0048] In addition, the dry tensile strength in the transverse direction of the tissue paper of this embodiment is arbitrary. For example, it is adjusted to be 50 cN / 25 mm or more and 200 cN / 25 mm or less, preferably 80 cN / 25 mm or more and 180 cN / 25 mm or less, more preferably 100 cN / 25 mm or more and 150 cN / 25 mm or less.

[0049] Here, the transverse direction indicates the direction (CD direction) orthogonal to the flow direction (MD direction) during the manufacture of the tissue paper ( Figure 1 ). In addition, the transverse dry tensile strength indicates the strength when the tissue paper is stretched in the direction orthogonal to the flow direction during manufacture (CD direction) in the dry state.

[0050] The tensile elastic modulus of the tissue paper of this embodiment is preferably 7 N / mm 2 or more and 15 N / mm 2 or less, more preferably 8 N / mm 2 or more and 13 N / mm 2 or less, more preferably 8.5 N / mm 2 or more and 11 N / mm 2 or less.

[0051] Here, the tensile elastic modulus is measured by a tensile compression testing machine (manufactured by Minebea Mitsumi Co., Ltd., TGI-200N) for the longitudinal tensile strength. The sample with a width of 25 mm and an average paper thickness of 125 μm is clamped up and down with chucks (100 mm between the chucks), and the Young's modulus calculated by the following formula (1) is shown (refer to Figure 8 ).

[0052] Maximum slope of elongation and tensile strength (N / mm) × distance between chucks (mm) / width of specimen piece (mm) / thickness of specimen piece (mm) (1)

[0053] In addition, the longitudinal elongation rate of the tissue paper of the present embodiment is arbitrary. For example, it is adjusted to be 5% or more and 20% or less, preferably 8% or more and 18% or less, and more preferably 10% or more and 15% or less. Here, the longitudinal elongation rate is a value expressed as a percentage of the length when the tissue paper is stretched and broken in the flow direction (MD direction) in a dry state during manufacturing.

[0054] The handfeel value HF measured by the softness measuring device TSA of the tissue paper of the present embodiment is preferably 80 or more, more preferably 81 or more, and further preferably 83 or more. Among them, the softness measuring device TSA refers to the paper softness measuring device (TSA: Tissue Softness Analyzer) manufactured by Emtec Electronic.

[0055] The softness measuring device TSA (hereinafter referred to as TSA) is a device for measuring the properties of flat and flexible materials such as paper, cloth, and leather. In addition, the handfeel value HF (hereinafter referred to as HF value) is calculated from three parameters representing softness, smoothness, and rigidity measured by the TSA.

[0056] In the calculation of the handfeel value HF, FacialIII of the standard algorithm of Emtec Electronic is used. The HF value shows a tendency that the higher the value, the softer the feeling.

[0057] The softness peak TS7 measured by the softness measuring device TSA of the tissue paper of the present embodiment is preferably 11 or less, more preferably 10.9 or less, and further preferably 10.8 or less.

[0058] Here, the softness peak TS7 (hereinafter referred to as TS7) represents a parameter of softness measured by the TSA. TS7 shows a tendency that the lower the value, the softer the feeling. In addition, TS7 is used in the calculation of the above-mentioned handfeel value HF.

[0059] The smoothness peak TS750 measured by the softness measuring device TSA of the tissue paper of the present embodiment is preferably 9.5 or less, more preferably 9.45 or less, and more preferably 9.4 or less.

[0060] Here, the smoothness peak TS750 represents a parameter of smoothness measured by the TSA. TS750 shows a tendency that the lower the value, the smoother the feeling. In addition, TS750 is used in the calculation of the handfeel value HF together with the above-mentioned TS7.

[0061] The arithmetic mean height of the tissue paper of the present embodiment is preferably 3 μm or more and 7 μm or less, more preferably 4 μm or more and 6.5 μm or less, and further preferably 5 μm or more and 6 μm or less. Among them, the arithmetic mean height represents the average of the absolute values of the differences in height of each point with respect to the average plane of the surface (refer to Figure 2)。

[0062] The aspect ratio of the tissue paper of the present embodiment is preferably 0.4 or less, more preferably 0.35 or less, and still more preferably 0.3 or less. Here, the aspect ratio indicates the isotropy and anisotropy of the surface properties. The aspect ratio showing the surface properties takes a value of 0 to 1, and the closer it is to 0, the smoother it feels (see Figure 3 ).

[0063] Figure 4 It represents Figure 1 A schematic view of the cross-section between A and B in the flow direction (MD direction) of the tissue paper in Figure 5 It is a diagram showing an image of the surface of a conventional tissue paper measured by image analysis. Figure 6 , Figure 7 It represents Figure 5 A schematic view of the cross-section between A and B in the flow direction (MD direction) of the tissue paper in

[0064] In the conventional tissue paper, as shown in Figure 5 , Figure 6 , there are parts with large wrinkles. As shown in Figure 5 , Figure 7 , the wrinkles are uneven, and there are parts where wrinkles are not formed, etc. Therefore, there are limitations in improving softness and smoothness. In addition, the conventional tissue paper tends to have small elongation, large slope, high tensile elastic modulus, and a hard feeling ( Figure 9 ).

[0065] In contrast, as shown in Figure 1 and Figure 4 , the tissue paper of the present embodiment can form uniform and fine wrinkles. In addition, the tissue paper of the present embodiment has large elongation, small slope, low tensile elastic modulus, and a soft feeling ( Figure 8 ).

[0066] As described above, in the tissue paper of the present embodiment, by making the longitudinal dry tensile strength 250 cN / 25 mm or more and 400 cN / 25 mm or less, a tissue paper that is not easily torn can be obtained. In addition, it contains a softening agent, and the tensile elastic modulus is 7 N / mm 2 or more and 15 N / mm 2 or less, and the HF value of TSA is 80 or more, so that a tissue paper with excellent softness can be obtained.

[0067] In the tissue paper of the present embodiment, as described above, by containing a softening agent containing 0.1% by mass or more and 1.5% by mass or less of the oil component extracted with diethyl ether, the softness of the tissue paper can be improved.

[0068] In the tissue paper of the present embodiment, as described above, by making TS7 of TSA 11 or less, the softness of the tissue paper can be further improved.

[0069] In the tissue paper of the present embodiment, as described above, by making TS750 of TSA 9.5 or less, a tissue paper with excellent softness and smoothness can be obtained.

[0070] In the tissue paper of the present embodiment, as described above, by making the arithmetic mean height 3 μm or more and 7 μm or less, the smoothness of the tissue paper can be further improved.

[0071] In the tissue paper of the present embodiment, as described above, by making the aspect ratio of the surface property 0.4 or less, the smoothness of the tissue paper can be further improved.

[0072] <Method for manufacturing tissue paper>

[0073] The method for manufacturing tissue paper according to the present embodiment will be described. Figure 10 It is a flowchart of the method for manufacturing tissue paper according to the present embodiment. Figure 11 It is a schematic diagram of the apparatus for manufacturing the tissue paper according to the present embodiment, Figure 12 is an enlarged Figure 11 Schematic diagram of a part of the apparatus shown. In addition, the same parts in each figure are sometimes given the same reference numerals and the description is omitted.

[0074] The method for manufacturing the tissue paper according to the present embodiment is the method for manufacturing the above-mentioned tissue paper, including a papermaking step S1, a drying step S2, and a peeling step S3 ( Figure 10 ). In addition, the method for manufacturing tissue paper according to the present embodiment is an example of the method for manufacturing tissue paper according to the present invention.

[0075] The method for manufacturing tissue paper according to the present embodiment can be realized, for example, by Figure 11 the apparatus 100 for manufacturing tissue paper shown. Figure 11 The apparatus 100 shown includes a suction cylinder 10, a pulp slurry supply section 20, a felt 30, a roll 40, a single dryer cylinder 50, a hot air hood 60, an adhesive supply section 70, a wrinkling blade 80, and a doctor blade 90.

[0076] Here, using Figure 11 the apparatus 100 shown to specifically describe Figure 10 the method for manufacturing tissue paper shown.

[0077] In the papermaking process S1, the pulp slurry PS added with the above softener is made into wet paper P1 by papermaking. Specifically, the pulp slurry PS is supplied from the pulp slurry supply unit 20 to the surface of the rotating suction cylinder 10. In addition, the long blanket 30 is conveyed along the roller 40 (conveying roller 42). The conveying speed of the blanket 30 is arbitrary, for example, 900 to 1300 m / min.

[0078] When the blanket 30 passes through the suction cylinder 10 and the couch roll 41, the supplied pulp slurry PS is transferred to the blanket 30. The pulp slurry PS transferred to the blanket 30 is dewatered during conveyance to the touch roll 43 and becomes wet paper P1.

[0079] In the drying process S2, the wet paper P1 is made into dry paper P2 by a single drying cylinder 50. When the wet paper P1 passes between the surfaces of the mutually rotating touch roll 43 and the inlet side 51 of the single drying cylinder 50, it separates from the felt 30 and adheres to the surface of the single drying cylinder 50.

[0080] In addition, the felt 30 separated from the wet paper P1 is further conveyed to the tension roll 44 and then further conveyed to the touch roll 45 and passes between the surfaces of the touch roll 45 and the single drying cylinder 50 again. At this time, a part of the wet paper P1 remaining in the felt 30 adheres to the surface of the single drying cylinder 50.

[0081] Furthermore, the felt 30 is further conveyed to the slack take-up roll 46 and is conveyed to the squeeze roll 47 in a stretched state and is pressed. The felt 30 is conveyed between the suction cylinder 10 and the couch roll 41 in a pressed state, and the pulp slurry PS is transferred again, repeating the papermaking process S1.

[0082] In the drying process S2, before the wet paper P1 passes between the surfaces of the touch roll 43 and the inlet side 51 of the single drying cylinder 50, an adhesive is applied to the surface of the single drying cylinder 50. Specifically, an adhesive supply unit 70 is provided between the inlet side 51 of the single drying cylinder 50 and the cleaning blade 90, and the adhesive is sprayed from the adhesive supply unit 70 onto the surface of the single drying cylinder 50. Therefore, the adhesive is applied to the surface of the single drying cylinder 50, and a film (film F) of the adhesive is formed on the surface of the single drying cylinder 50.

[0083] In addition, the composition of the adhesive is not particularly limited, and preferably contains a thermosetting polyamide resin. The thermosetting polyamide resin has thermosetting properties and is heated and cured on the surface of the single drying cylinder 50.

[0084] At this time, when the thermosetting polyamide resin is applied as an adhesive to the surface of the single drying cylinder 50, a part F1 of the film formed by strong heating becomes hard near the single drying cylinder 50. In addition, a part F2 of the film formed by weak heating becomes soft on the dry paper side far from the single drying cylinder 50 ( Figure 12 ).

[0085] The thermosetting polyamide resin is not particularly limited, and examples thereof include polyamine polyamide epichlorohydrin.

[0086] In addition, polyamine polyamide epichlorohydrin (PAE) can control the molecular weight, crosslinking density, and cationicity of the resin by controlling the denaturation caused by epichlorohydrin. In addition, PAE can also regulate the thermosetting property by controlling the amount of azetidine ring (AZR) formed in the resin. In addition, by adjusting the thermosetting property of the thermosetting polyamide resin, the coating can be thickened by the adhesive.

[0087] The amount of the adhesive coated on the surface of the single drying cylinder 50 is 0.5 mg / m 2 or more and 3.5 mg / m 2 or less, preferably 0.8 mg / m 2 or more and 3.3 mg / m 2 or less, more preferably 1 mg / m 2 or more and 3 mg / m 2 or less.

[0088] In the present embodiment, the coating amount of the adhesive is adjusted to 1 to 4 kg / t with respect to the mass (t) of the obtained tissue paper P3. At this time, the film thickness of the film F formed on the surface of the single drying cylinder 50 is estimated to be 1 to 3.5 μm. The film thickness of this film F is about 5 times the film thickness of the film formed on the surface of the conventional single drying cylinder 50 (see Figures 12 to 15 ).

[0089] In the drying step S2, the wet paper P1 passes through the hot air hood 60 in a state of being adhered to the surface of the single drying cylinder 50 rotating in the RD direction and becomes the dry paper P2 before being conveyed to the outlet side 52 of the single drying cylinder 50.

[0090] In the peeling step S3, the dry paper P2 conveyed to the outlet side 52 of the single drying cylinder 50 is peeled from the single drying cylinder 50 by the wrinkling blade 80. Specifically, the tip of the wrinkling blade 80 is disposed between the single drying cylinder 50 and the dry paper P2, and the dry paper P2 is separated from the single drying cylinder 50 while forming wrinkles.

[0091] The dry paper P2 separated from the single drying cylinder 50 is the tissue paper P3. The wrinkling rate of the tissue paper P3 is arbitrary, but preferably 10 to 20%.

[0092] In addition, the single drying cylinder 50 from which the dry paper P2 is separated is conveyed to the scraping blade 90 and cleaned. More specifically, the soft film F2 in the film F remaining on the surface of the single drying cylinder 50 is scraped off by the tip of the scraping blade 90, and only the hard film F1 remains on the surface of the single drying cylinder 50 ( Figure 12 ).

[0093] On the way of transferring the clean single drying cylinder 50 to the inlet side 51 of the single drying cylinder 50, an adhesive is re-coated on the surface of the single drying cylinder 50 to form a film F. Then, the single drying cylinder 50 having the film F formed on its surface is conveyed to the inlet side 51, and the wet paper P1 is adhered to the surface of the single drying cylinder 50 again, and the drying process S2 is repeated.

[0094] In addition, in the conventional method for manufacturing tissue paper, sometimes a thin and soft film F3 ( Figure 13 ) is formed in the single drying cylinder 50. In this manufacturing method, since the film F3 is thin, the tip of the wrinkling blade 80 abuts against the dry paper P2, and the paper quality on the surface deteriorates. In addition, since the film F3 is soft, it is easily peeled off from the surface of the single drying cylinder 50, so the adhesion of the wet paper P1 or the dry paper P2 to the single drying cylinder 50 is insufficient.

[0095] Furthermore, in the conventional method for manufacturing tissue paper, sometimes a thin and hard film F4 ( Figure 14 ) is formed in the single drying cylinder 50. In this manufacturing method, the dry paper P2 is peeled between the thin and hard film F4 and the dry paper P2, resulting in larger wrinkles, poor surface properties, and harder paper quality.

[0096] Moreover, in the conventional method for manufacturing tissue paper, sometimes a hard film F5 and a release layer F6 ( Figure 15 ) are formed in the single drying cylinder 50. In this manufacturing method, through the release layer F6, it becomes easy to peel the dry paper P2 from the single drying cylinder 50, and the wrinkles become smaller, so the surface properties are improved, but the paper quality becomes harder.

[0097] In contrast, in the manufacturing method of the present embodiment, as described above, by coating an adhesive of 0.5 mg / m 2 or more and 3.5 mg / m 2 or less on the surface of the single drying cylinder 50, a thick film F ( Figure 11 , Figure 12 ) can be formed on the surface of the single drying cylinder 50. Due to this thick film F, in the peeling process S3, the tip of the wrinkling blade 80 enters between the single drying cylinder 50 and the dry paper P2, so that the dry paper P2 is peeled while protecting the surface of the dry paper P2 with the film F. Therefore, a tissue paper with uniform and fine wrinkles is obtained.

[0098] In addition, in the manufacturing method of the present embodiment, by the thick film F formed on the surface of the single drying cylinder 50, in the peeling process S3, it is possible to avoid the tip of the single drying cylinder 50 from contacting or abutting against the surface of the single drying cylinder 50. Therefore, in the manufacturing method of the present embodiment, the surface of the single drying cylinder 50 can be protected by this thick film F.

[0099] In addition, in the manufacturing method of the present embodiment, a thick film F is formed between the surface of the single drying cylinder 50 and the dry paper P2. As described above, wrinkles are formed on the dry paper P2 through the film F. In addition, the tip of the single drying cylinder 50 is difficult to contact the surface of the single drying cylinder 50. Therefore, the single drying cylinder 50 itself can also be protected in the peeling step S3.

[0100] In the manufacturing method of the present embodiment, since the adhesive applied to the surface of the single drying cylinder 50 contains a thermosetting polyamide resin, when a thick film F is formed on the surface of the single drying cylinder 50, near the single drying cylinder 50, a part F1 of the film F hardens by strong heating, and on the dry paper P2 side far from the single drying cylinder 50, a part F2 of the film F softens by weak heating.

[0101] Therefore, in the manufacturing method of the present embodiment, the dry paper P2 can be easily adhered through the soft film F2 formed on the surface of the single drying cylinder 50, and the dry paper P2 can be easily picked up in the drying step S2 (the wet paper P1 is adhered to the single drying cylinder 50). In addition, the surface of the single drying cylinder 50 can be protected by strengthening through the hard film F1 formed on the surface of the single drying cylinder 50.

[0102] Examples

[0103] Hereinafter, the present invention will be specifically described with further examples. The evaluation of the examples and comparative examples was conducted through the following tests.

[0104] [Tissue paper (test specimen)]

[0105] Through Figure 11 the manufacturing method, tissue paper was manufactured and used as the test specimen.

[0106] [Surface roughness (arithmetic mean height, aspect ratio of surface properties)]

[0107] The surface roughness was measured using a single-lens 3D shape measuring machine VR-3200 and image analysis software VR-H2A manufactured by Keyence Corporation. The measurement of the surface roughness was carried out under the conditions of a magnification of 12 times and a field of view area of 30 mm × 30 mm. Based on the obtained surface roughness, the arithmetic mean height and the aspect ratio of the surface properties were calculated. The arithmetic mean height is the average of the absolute values of the differences in height at each point with respect to the average plane of the surface. The aspect ratio of the surface properties is a value in the range of 0 to 1 obtained as the isotropy and anisotropy of the surface properties.

[0108] [Grammage (per square meter)]

[0109] The grammage (per square meter) of the tissue paper was measured according to the provisions of JIS P 8124. The unit of grammage is g / m 2 .

[0110] [Paper thickness]

[0111] The thickness of the tissue paper was measured according to the provisions of JIS P 8111 (1998). The unit of thickness is μm.

[0112] [Dry tensile strength]

[0113] The dry tensile strength was measured according to the provisions of JIS P 8113 (1998). The test pieces were cuttings with a width of 25 mm (±0.5 mm) × a length of about 150 mm in both the longitudinal direction (MD direction) and the transverse direction (CD direction). A load cell tensile testing machine TG-200N manufactured by Minebea Co., Ltd. was used as the testing machine. The measurement of the dry tensile strength was carried out in the following order: the gripping interval was set to 100 mm, both ends of the test piece were fastened to the grips of the testing machine, the paper was stretched up and down, a load was applied, and the indicated value (numerical value) at the time of paper breakage was read. The stretching speed was 100 mm / min. Five sets of test materials were prepared for both the longitudinal and transverse directions, and each was measured 5 times. The average of the measured values was used as the dry tensile strength in each direction. In addition, the aspect ratio was calculated as the ratio of the tensile strength in the longitudinal direction to that in the transverse direction.

[0114] [Elongation]

[0115] The longitudinal elongation was measured using a universal tensile and compression testing machine TG-200N manufactured by Minebea Mitsumi Inc.

[0116] [Tensile elastic modulus]

[0117] In a tensile and compression testing machine TGE-200N manufactured by Minebea Mitsumi Inc., a sample with a width of 25 mm and an average paper thickness of 125 μm was clamped at the upper and lower parts with chucks (100 mm between the chucks), and the longitudinal tensile strength was measured. It was calculated by the formula "the maximum slope of elongation and tensile strength (N / mm) × the distance between the chucks (mm) / the width of the test piece (mm) / the thickness of the test piece (mm)".

[0118] [TSA measurement]

[0119] Using a paper softness measuring device (TSA: Tissue Softness Analyzer) manufactured by Emtec Electronic GmbH, the hand feeling value HF, the softness peak value TS7, and the smoothness peak value TS750 were measured.

[0120] [Oil extraction]

[0121] The test specimen was immersed in diethyl ether, and the amount of the extracted oil (extracted oil) was calculated as a ratio to the paper weight.

[0122] [Sensory test]

[0123] Softness, moist feeling, smoothness, thickness feeling, and their comprehensive evaluation were carried out. When the comprehensive evaluation was 4.5 or more, it was evaluated as good.

[0124] Hereinafter, examples and comparative examples will be described.

[0125] [Example 1]

[0126] A test specimen adjusted to an arithmetic mean height of 5.5 μm, an aspect ratio of surface properties of 0.25, a basis weight of 12.2 g / m 2 , a paper thickness of 131 μm, a dry tensile strength (longitudinal) of 289 cN, a dry tensile strength (transverse) of 126 cN, an elongation (longitudinal) of 13.2%, a tensile elastic modulus of 8.8 N / mm 2 , an HF value of 82.4, a TS7 value of 10.8, a TS750 value of 8.2, and an extracted oil of 1.3% was evaluated. The results are shown in Table 1.

[0127] [Example 2]

[0128] A test specimen adjusted to an arithmetic mean height of 5.6 μm, an aspect ratio of surface properties of 0.2, a basis weight of 12.1 g / m 2 , a paper thickness of 123 μm, a dry tensile strength (longitudinal) of 345 cN, a dry tensile strength (transverse) of 128 cN, an elongation (longitudinal) of 11.7%, a tensile elastic modulus of 10.7 N / mm 2 , an HF value of 83.5, a TS7 value of 10.4, a TS750 value of 9.4, and an extracted oil of 1.3% was evaluated. The results are shown in Table 1.

[0129] [Comparative Example 1]

[0130] A test specimen adjusted to an arithmetic mean height of 5.3 μm, an aspect ratio of surface properties of 0.34, a basis weight of 12 g / m2, a paper thickness of 131 μm, a dry tensile strength (longitudinal) of 272 cN, a dry tensile strength (transverse) of 125 cN, an elongation (longitudinal) of 7.9%, a tensile elastic modulus of 16.6 N / mm 2 , an HF value of 79.5, a TS7 value of 11.5, a TS750 value of 9.3, and an extracted oil of 1% was evaluated. The results are shown in Table 1.

[0131] [Comparative Example 2]

[0132] Adjusted to an arithmetic mean height of 5.9 m, an aspect ratio of surface properties of 0.48, and a mass per unit area of 10.5 g / m 2 , a paper thickness of 112 μm, a dry tensile strength (longitudinal) of 408 cN, a dry tensile strength (transverse) of 132 cN, an elongation (longitudinal) of 10.5%, and a tensile elastic modulus of 17.8 N / mm 2 , a test piece with an HF value of 73.8, a TS7 value of 14, a TS750 value of 10.8, and an extracted oil content of 0% was evaluated. The results are shown in Table 1.

[0133] [Comparative Example 3]

[0134] Adjusted to an arithmetic mean height of 7.2 m, an aspect ratio of surface properties of 0.47, and a mass per unit area of 13.4 g / m 2 , a paper thickness of 140 μm, a dry tensile strength (longitudinal) of 349 cN, a dry tensile strength (transverse) of 115 cN, an elongation (longitudinal) of 17.2%, and a tensile elastic modulus of 9.6 N / mm 2 , a test piece with an HF value of 77.8, a TS7 value of 13.4, a TS750 value of 9.9, and an extracted oil content of 0.7% was evaluated. The results are shown in Table 1.

[0135] [Comparative Example 4]

[0136] Adjusted to an arithmetic mean height of 7.7 m, an aspect ratio of surface properties of 0.39, and a mass per unit area of 12.3 g / m 2 , a paper thickness of 125 μm, a dry tensile strength (longitudinal) of 236 cN, a dry tensile strength (transverse) of 123 cN, an elongation (longitudinal) of 11.6%, and a tensile elastic modulus of 9.7 N / mm 2 , a test piece with an HF value of 82.1, a TS7 value of 10.8, a TS750 value of 9.5, and an extracted oil content of 0.5% was evaluated. The results are shown in Table 1.

[0137] [Table 1]

[0138]

[0139] As shown in Table 1, adjusted to an arithmetic mean height of 5.5 - 5.6 μm, an aspect ratio of surface properties of 0.2 - 0.25, and a mass per unit area of 12.1 - 12.2 g / m 2 , a paper thickness of 123 - 131 μm, a dry tensile strength (longitudinal) of 289 - 345 cN, a dry tensile strength (transverse) of 126 - 128 cN, an elongation (longitudinal) of 11.7 - 13.2%, and a tensile elastic modulus of 8.8 - 10.7 N / mm 2, a tissue paper with an HF value of 82.4 - 83.5, a TS7 value of 10.4 - 10.8, a TS750 value of 8.2 - 9.4, and an extracted oil content of 1.3%, has a comprehensive evaluation of 4.5 or more (Examples 1 and 2).

[0140] In contrast, for a tissue paper in which at least any one of the arithmetic mean height, the aspect ratio of the surface properties, the dry tensile strength (longitudinal), the tensile elastic modulus, the HF value, the TS7 value, the TS750 value, and the extracted oil content is outside the ranges of Examples 1 and 2, its comprehensive evaluation is less than 4.5 (Comparative Examples 1 - 4).

[0141] From the above results, it can be seen that a softener containing 0.1% by mass or more and 1.5% by mass or less of oil extracted with diethyl ether, a dry tensile strength in the longitudinal direction of 250 cN / 25 mm or more and 400 cN / 25 mm or less, a tensile elastic modulus of 7 N / mm 2 or more and 15 N / mm 2 or less, an HF value of TSA of 80 or more, a TS7 of TSA of 11 or less, a smoothness peak TS750 measured by TSA of 9.5 or less, an arithmetic mean height of 3 μm or more and 7 μm or less, and an aspect ratio of the surface properties of 0.4 or less for the tissue paper can be said to be a tissue paper with excellent softness and smoothness.

[0142] The above describes the embodiments of the present invention. However, the present invention is not limited to specific embodiments, and various modifications and changes can be made within the scope of the invention described in the claims.

[0143] The following is a note on the preferred embodiments of the present invention.

[0144] The first aspect of the present invention provides a tissue paper containing a softener, with a dry tensile strength in the longitudinal direction of 250 cN / 25 mm or more and 400 cN / 25 mm or less, a tensile elastic modulus of 7 N / mm 2 or more and 15 N / mm 2 or less, and a feel value HF measured by a softness measuring device TSA of 80 or more.

[0145] In the first aspect, by making the dry tensile strength in the longitudinal direction 250 cN / 25 mm or more and 400 cN / 25 mm or less, a tissue paper that is not easily damaged can be obtained. In addition, it contains a softener, the tensile elastic modulus is 7 N / mm 2 or more and 15 N / mm 2 or less, and the HF value of TSA is 80 or more, so that a tissue paper with excellent softness can be obtained.

[0146] The second aspect of the present invention provides a tissue paper, wherein the softener contains 0.1% by mass or more and 1.5% by mass or less of the oil content extracted with diethyl ether. In the second aspect, the softener containing 0.1% by mass or more and 1.5% by mass or less of the oil content extracted with diethyl ether can improve the softness of the tissue paper.

[0147] The third aspect of the present invention provides a tissue paper, wherein the softness peak value TS7 measured by the above softness measuring device TSA is 11 or less. In the third aspect, by making TS7 of TSA 11 or less, the softness of the tissue paper can be further improved.

[0148] The fourth aspect of the present invention provides a tissue paper, wherein the smoothness peak value TS750 measured by the above softness measuring device TSA is 9.5 or less. In the fourth aspect, by making TS750 of TSA 9.5 or less, a tissue paper with excellent softness and smoothness can be obtained.

[0149] The fifth aspect of the present invention provides a tissue paper, wherein the arithmetic mean height is 3 μm or more and 7 μm or less. In the fifth aspect, by making the arithmetic mean height 3 μm or more and 7 μm or less, the smoothness of the tissue paper can be further improved.

[0150] The sixth aspect of the present invention provides a tissue paper with an aspect ratio of 0.4 or less. In the sixth aspect, by making the aspect ratio of the surface property 0.4 or less, the smoothness of the tissue paper can be further improved.

[0151] The seventh aspect of the present invention provides a method for manufacturing a tissue paper, which is a method for manufacturing any one of the tissue papers of the first to sixth aspects described above, and has: a papermaking process of papermaking the pulp slurry added with the above softener to form a wet paper, a drying process of making the above wet paper into a dry paper with a single drying cylinder, and a peeling process of peeling the above dry paper from the single drying cylinder with a wrinkling blade. The surface of the single drying cylinder is coated with 0.5 mg / m 2 or more and 3.5 mg / m 2 or less of an adhesive.

[0152] In the seventh aspect, by coating 0.5 mg / m 2 or more and 3.5 mg / m 2 or less of an adhesive on the surface of the single drying cylinder, a thick film can be formed on the surface of the drying cylinder. Due to this thick film, at the peeling process, the tip of the wrinkling blade enters between the single drying cylinder and the dry paper, and the dry paper is peeled while protecting the surface of the dry paper with the film. Therefore, a tissue paper with uniform and fine wrinkles is obtained.

[0153] In addition, in the seventh method, by forming a thick film on the surface of the dryer cylinder, it is possible to prevent the tip of the wrinkling blade from contacting the surface of the single dryer cylinder during the peeling process. Therefore, in the seventh method, the surface of the single dryer cylinder can be protected by this thick film.

[0154] In addition, in the seventh method, by forming a thick film between the surface of the single dryer cylinder and the dry paper, as described above, wrinkles are formed on the dry paper through the film. In addition, it is difficult for the tip of the wrinkling blade to contact the surface of the single dryer cylinder. Therefore, the single dryer cylinder itself can also be protected during the peeling process.

[0155] The eighth method of the present invention provides a method for manufacturing tissue paper, wherein the adhesive contains a thermosetting polyamide resin. By making the adhesive coated on the surface of the single dryer cylinder contain a thermosetting polyamide resin, when a thick film is formed on the surface of the single dryer cylinder, near the single dryer cylinder, due to strong heating, a part of the film hardens, and on the dry paper side far from the single dryer cylinder, due to weak heating, a part of the film softens.

[0156] Therefore, in the eighth method, by forming a soft film on the surface of the single dryer cylinder, it is easy to bond the dry paper, and during the drying process, it is easy to pick up the dry paper (bond the wet paper to the single dryer cylinder). In addition, by forming a hard film on the surface of the single dryer cylinder, the protection of the surface of the single dryer cylinder can be strengthened.

[0157] This application claims the priority of Japanese Patent Application No. 2020-198096 filed on November 30, 2020, and incorporates all of its contents into this application.

[0158] Reference Signs Explanation

[0159] 100 Device

[0160] 10 Suction Cylinder

[0161] 20 Pulp Slurry Supply Section

[0162] 30 Felt

[0163] 40 Roll

[0164] 41 Couch Roll

[0165] 42 Transfer Roll

[0166] 43 Touch Roll

[0167] 44 Tension Roll

[0168] 45 Touch Roll

[0169] 46 Slack Roll

[0170] 47 Squeeze Roll

[0171] 50 Single dryer cylinder

[0172] 51 Inlet side

[0173] 52 Outlet side

[0174] 60 Hot air hood

[0175] 70 Adhesive supply section

[0176] 80 Creasing blade

[0177] 90 Coating blade

[0178] PS Pulp slurry

[0179] P1 Wet paper

[0180] P2 Dry paper

[0181] P3 Facial tissue paper

[0182] F F1, F2 membranes

[0183] MD Machine direction (flow direction)

[0184] CD Cross direction (direction perpendicular to the flow direction).

Claims

1. A tissue paper containing a softening agent, with a longitudinal dry tensile strength of 250 cN / 25 mm or more and 400 cN / 25 mm or less, The tensile elastic modulus is 7 N / mm 2 or more and 15 N / mm 2 or less and a handle feeling value HF measured by a softness measuring device TSA of 80 or more, wherein the softening agent contains 1.3 mass% or more and 1.5 mass% or less of an oil component extracted with diethyl ether in the softening agent, the softening agent contains a fatty acid ester compound and a fatty acid amide compound, and the mixing ratio of the fatty acid ester compound and the fatty acid amide compound in the softening agent is 1:1 to 1:

5.

2. The tissue paper according to claim 1, wherein the softness peak value TS7 measured by the softness measuring device TSA is 11 or less.

3. The tissue paper according to claim 1 or 2, wherein the smoothness peak value TS750 measured by the softness measuring device TSA is 9.5 or less.

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

5. The tissue paper according to any one of claims 1 to 4, with an aspect ratio of 0.4 or less.

6. A method for manufacturing a tissue paper, which is a method for manufacturing the tissue paper according to any one of claims 1 to 5, and has the following steps: A papermaking step of making a wet paper by papermaking the pulp slurry added with the softening agent, A drying step of making the wet paper into a dry paper with a single drying cylinder, A peeling step of peeling the dry paper from the single drying cylinder using a wrinkling blade, The surface of the single dryer cylinder is coated with an adhesive of more than 0.5 mg / m 2 and less than 3.5 mg / m 2 .

7. The method for manufacturing a tissue paper according to claim 6, wherein the adhesive contains a thermosetting polyamide resin.

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