CN216060321U - Sanitary tissue paper - Google Patents
Sanitary tissue paper Download PDFInfo
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- CN216060321U CN216060321U CN202023328732.3U CN202023328732U CN216060321U CN 216060321 U CN216060321 U CN 216060321U CN 202023328732 U CN202023328732 U CN 202023328732U CN 216060321 U CN216060321 U CN 216060321U
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- Prior art keywords
- tissue paper
- paper
- tissue
- water
- sanitary
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K10/00—Body-drying implements; Toilet paper; Holders therefor
- A47K10/16—Paper towels; Toilet paper; Holders therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H39/00—Associating, collating, or gathering articles or webs
- B65H39/16—Associating two or more webs
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
Abstract
The utility model provides a sanitary tissue paper having excellent water absorbency and excellent water wiping property. The sanitary tissue paper has a multi-layered structure formed by overlapping a plurality of tissue papers, and at least one of the two tissue papers forming the outer layer of the multi-layered structure among the plurality of tissue papers has a shorter water absorption time and a larger water diffusion area than the adjacent tissue paper.
Description
Technical Field
The present invention relates to a sanitary tissue paper, and more particularly to a sanitary tissue paper having a multi-layered structure in which two or more sheets of tissue paper are stacked.
Background
In the technical field of sanitary tissue paper such as toilet paper and household paper, various techniques for effectively wiping off moisture have been proposed.
For example, in the toilet paper disclosed in patent document 1, a set of three or more sheets is formed, and water can be absorbed by gaps formed between the sheets in addition to the water absorption force of the sheets, thereby having excellent water absorption property.
Further, in the water-disintegrable toilet paper disclosed in patent document 2, the outer layer is formed in a plurality of layers of three or more layers, and the water absorption time of the outer layer is set to be shorter than that of the inner layer, so that after the water absorbed in the outer layer is rapidly locked in the inner layer, the water is diffused in the inner layer having a longer water absorption time than that of the outer layer, and further, the water-disintegrable toilet paper is excellent in water absorbability and can prevent the water from flowing out from the back surface.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2002-172072;
patent document 2: japanese patent laid-open No. 2006-334326;
SUMMERY OF THE UTILITY MODEL
However, in the above-described conventional multilayer structure, when moisture is wiped off, the outer layer wiping portion is filled with moisture while the moisture wiped off by the outer layer is diffused in the inner layer, and not only is it impossible to absorb more moisture, but also the outer layer wiping portion is easily broken due to the influence of moisture not absorbed. Therefore, a sanitary tissue paper having excellent water absorbency and excellent water wiping property is desired.
The utility model aims to provide a sanitary tissue paper having excellent water absorbency and excellent water wiping performance.
As a result of intensive studies to solve the above problems, the present inventors have found that in a sanitary tissue paper having a multi-layered structure in which a plurality of tissue papers are stacked, by making at least one of two tissue papers forming an outer layer of the multi-layered structure out of the plurality of tissue papers shorter in water absorption time and larger in water diffusion area than the adjacent tissue paper, a sanitary tissue paper having excellent water absorbency and excellent water wiping property can be obtained.
Specifically, the present invention has the following structure.
(1) A sanitary tissue paper having a multi-layered structure of a plurality of tissue papers stacked one upon another,
at least one of two tissue papers forming an outer layer of a multi-layered structure among the plurality of tissue papers has a shorter water absorption time and a larger water diffusion area than the adjacent tissue papers.
(2) A sanitary tissue paper having a multi-layered structure of three or more sheets of tissue paper stacked on top of each other,
each of two tissue papers forming an outer layer of a multi-layered structure among the plurality of tissue papers has a shorter water absorption time and a larger water diffusion area than the adjacent tissue papers.
(3) The sanitary tissue paper according to (1) or (2),
at least one of two tissues forming an outer layer of a multi-layered structure among the plurality of tissues has a higher crepe density than the adjacent tissue, so that the water absorption time is short and the water diffusion area is large compared to at least one of the two tissues.
Effect of the utility model
In the sanitary tissue paper according to the present invention, when one side of the outer-layer tissue paper having a shorter water absorption time and a larger water diffusion area than the adjacent tissue paper is used as the surface for wiping off water, the outer-layer tissue paper can diffuse the wiped-off water relatively quickly in the surface direction of the outer-layer tissue paper and absorb the water relatively quickly in the thickness direction. The tissue paper adjacent to the outer layer of tissue paper can receive the water permeating in the thickness direction from the outer layer of tissue paper in a relatively large area, spread in the planar direction at a relatively slow speed, and be absorbed in the thickness direction at a relatively slow speed. The outer-layer tissue paper and the adjacent tissue paper are configured to overlap each other so as to be adjacent to each other, and a gap is formed between the two, so that the sanitary tissue paper can hold moisture by the gap.
According to the structure of the present invention, since moisture can be rapidly absorbed into the interior and rapidly diffused into the interior, the following phenomenon can be prevented: moisture is saturated in the wiping portion of the outer layer of tissue paper, and thus the wiping portion is likely to be broken under the influence of moisture not absorbed completely. Further, since the speed of movement of the moisture absorbed into the interior can be suppressed, the moisture can be suppressed from penetrating through the sanitary tissue paper in the thickness direction and seeping out from the surface on the side opposite to the wiping surface, that is, the phenomenon of "seeping out of moisture (pulling out け of the moisture)". Therefore, according to the present invention, a sanitary tissue paper having excellent water absorbency and excellent water wiping property can be provided.
Drawings
Fig. 1 is a schematic view for explaining the structure of a sanitary tissue paper according to an embodiment of the present invention;
fig. 2 is a diagram showing an example of a paper machine that can be applied to the production of sanitary tissue paper;
fig. 3 is a schematic view showing an example of a laminator that can be suitably used for manufacturing a secondary parent roll (secondary parent roll ロール) for sanitary tissue paper;
FIG. 4 is a schematic diagram showing an example of a sanitary tissue paper produced by the laminator of FIG. 3;
fig. 5 is a photograph under a microscope showing the surface of the sanitary tissue paper applicable to the embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments and the accompanying drawings are intended to illustrate, but not limit the present invention.
(first embodiment)
(production of sanitary tissue paper)
Fig. 1 is a schematic view for explaining the structure of a sanitary tissue paper according to an embodiment of the present invention. In fig. 1, the same components are denoted by the same reference numerals.
Fig. 1 (a) shows a sanitary tissue paper according to the present embodiment having a two-ply structure in which two pieces of tissue paper (tissue paper 101 and tissue paper 201) are superimposed. Tissue 101 and tissue 201 each form the outer layers of a two-ply structure. Fig. 1 (b) shows a sanitary tissue paper according to the present embodiment having a three-layer structure in which three tissues (tissue paper 101, tissue paper 201, and tissue paper 301) are stacked. Tissue 101 and tissue 301 each form the outer layer of the three-ply structure. Fig. 1 (c) shows a sanitary tissue paper according to the present embodiment having a four-layer structure in which four sheets of tissue paper (tissue paper 101, tissue paper 201, tissue paper 401, and tissue paper 501) are stacked. Tissue 101 and tissue 501 each form the outer layer of a four-ply structure.
In each of the multi-layer structures illustrated in fig. 1 (a) to 1 (c), the tissue paper 101 and the tissue paper 201 are overlapped so as to be adjacent to each other, and the tissue paper 101 forming one outer layer has a shorter water absorption time and a larger water diffusion area than the tissue paper 201 adjacent thereto.
As described above, the sanitary tissue paper according to the present embodiment has a multi-layered structure in which a plurality of tissue papers are stacked. In addition, at least one of two tissues forming the outer layer among a plurality of tissues having a multi-layered structure has a shorter water absorption time and a larger water diffusion area than the adjacent tissues. The number of sheets of tissue paper constituting the sanitary tissue paper according to the present embodiment is not limited to the illustrated examples as long as the requirements are satisfied, and may be two, three, four, five or more sheets, that is, the multi-ply may be two, three, four, five or more plies.
< Water absorption time >
The water absorption time of the tissue paper of the present invention is obtained by a method based on the measurement method of the water absorption of "plain paper" (old) according to JIS S3104 (1992). A drop of distilled water (23. + -. 1 ℃ C., 0.1ml) was dropped from a height of 10mm to the test piece by a pipette, and the time from the instant when the drop of water contacted the test piece to the instant when the water was completely absorbed and the reflection on the surface of the test piece disappeared was measured by a stopwatch (in 0.1 second). The experiment was carried out five times in total, and the average value thereof was taken as the water absorption time.
The water absorption time of each tissue paper is preferably about 5 to 25 seconds. The tissue paper forming the outer layer preferably has a water absorption time of 5 to 18 seconds, more preferably 7 to 15 seconds. The water absorption time of the tissue paper adjacent to the tissue paper forming the outer layer is longer than the water absorption time of the tissue paper forming the outer layer, and is preferably about 8 to 25 seconds, and more preferably about 10 to 20 seconds.
< water diffusion area >
The water diffusion area of the tissue paper according to the present invention is obtained by a method based on the measurement method of the water absorption of "paper for daily use" (old) according to JIS S3104 (1992). A drop of distilled water (23. + -. 1 ℃ C., 0.1ml) was dropped onto the test piece from a height of 10mm by a pipette, and the maximum length (mm) of the dispersion in the MD direction and the CD direction of the test piece, which is the dispersion 30 seconds after the moment when the drop of water contacted the test piece, was measured, and the product of the two was obtained. The experiment was carried out five times in total, and the average value thereof was taken as the water diffusion area.
The water diffusion area of each tissue paper is preferably 1500mm2The above. The water diffusion area of the formed tissue paper forming the outer layer is preferably 1700mm2Above, more preferably 1900mm2The above. The tissue paper adjacent to the tissue paper forming the outer layer has a water diffusion area smaller than that of the tissue paper forming the outer layer, preferably 1500mm2Above, more preferably 1600mm2The above.
(Effect)
The operation and effect of the first embodiment of the present invention will be described with reference to fig. 1 (a).
At this time, since the moisture is diffused in advance to some extent in the planar direction through the tissue paper 101, the tissue paper 201 can receive the moisture transmitted from the tissue paper 101 over a relatively large area. The tissue paper 201 has a property of having a longer water absorption time than the adjacent tissue paper 101, and can receive water over a relatively large area as described above, and therefore, it is less likely that water which cannot be absorbed by the tissue paper 201 immediately due to the difference in water absorption time between the tissue papers is generated.
As described above, the sanitary tissue paper according to the embodiment of the present invention can absorb water by utilizing the water absorption force of each tissue paper constituting the sanitary tissue paper and also the water retention force of the gap formed between the tissue papers, and therefore, the entire sanitary tissue paper can rapidly absorb water into the inside of the structure and has excellent water absorption property. Further, by the excellent water absorption property, the following phenomenon can be prevented: the wiping portion of the outer layer of tissue paper 101 is likely to be damaged by the influence of moisture saturated in the wiping portion and thus not absorbed completely.
Further, since the tissue paper 201 absorbs water for a long time and has a small water diffusion area compared to the adjacent tissue paper 101, the water that has penetrated the tissue paper 101 relatively quickly is diffused in the planar direction at a relatively slow speed in the tissue paper 201 and absorbed in the thickness direction. That is, the moisture wiped off by the sanitary tissue paper moves rapidly in the tissue paper 101 and then moves slowly in the tissue paper 201, whereby the sanitary tissue paper can absorb the moisture into the interior rapidly and can store the moisture absorbed into the interior for a relatively long time. This prevents the wiping water from oozing out from the side opposite to the wiping surface of the sanitary tissue paper, i.e., the phenomenon of "water oozing out".
Therefore, according to the embodiment of the present invention, a sanitary tissue paper having excellent water absorbency and excellent water wiping property can be provided.
The operational effects of the first embodiment of the present invention are described above with reference to the sanitary tissue paper having a two-ply structure as shown in fig. 1 (a). The three-ply sanitary tissue paper shown in fig. 1 (b) and the four-ply sanitary tissue paper shown in fig. 1 (c) are also sanitary tissue papers including the same tissue paper 101 and tissue paper 201 as the two-ply sanitary tissue paper shown in fig. 1 (a), and the same description can be applied to the effects thereof. The above-described effects can be produced by configuring a sanitary paper having a multi-layer structure of five or more layers, not shown, such that at least one of two tissue papers forming the outer layer of the multi-layer structure has a shorter water absorption time and a larger water diffusion area than the adjacent tissue paper.
(tissue paper)
Tissue paper, which is a constituent element of sanitary tissue paper, is obtained by papermaking from a slurry containing a pulp component as a fiber raw material. Tissue paper corresponds to base paper for producing sanitary tissue paper, and therefore, the tissue paper is hereinafter also referred to as "base paper" or "base paper sheet".
(pulp Components)
The pulp component includes wood pulp, non-wood pulp, and deinked pulp. Examples of the wood pulp include chemical pulps such as hardwood pulp (hardwood kraft pulp (LKP)), softwood pulp (softwood kraft pulp (NKP)), sulfurous acid pulp (SP), Dissolving Pulp (DP), Alkaline Pulp (AP), Unbleached Kraft Pulp (UKP), and oxygen bleached kraft pulp (OKP). Further, there may be mentioned semichemical pulp (SCP), semichemical pulp such as Chemical Groundwood (CGP), mechanical pulp such as Groundwood (GP), thermomechanical pulp (TMP, BCTMP) and the like, but not particularly limited thereto. Examples of the non-wood pulp include, but are not particularly limited to, cotton-based pulps such as cotton linters and lint, non-wood-based pulps such as hemp, straw and bagasse, celluloses separated from ascidians, seaweeds and the like, chitins, chitosans and the like. The deinked pulp is not particularly limited, and may be deinked pulp produced from waste paper. The pulp component may be used alone or in combination of two or more. Since these pulp components greatly affect the quality of the sanitary tissue paper, a predetermined type and addition ratio are appropriately selected according to the desired quality.
For example, at least one selected from hardwood pulp and softwood pulp is preferably used as the pulp component. Softwood pulp fibers are long and strong and can impart strength to the paper tissue being manufactured. In addition, hardwood pulp fibers are short, and can provide homogeneity and a good texture to a tissue paper produced by the papermaking process. In the embodiment of the present invention, a combination of hardwood pulp and softwood pulp is preferably used, and a combination of hardwood kraft pulp (LKP) and softwood kraft pulp (NKP) is more preferably used.
When a combination of softwood pulp and hardwood pulp is used as the pulp component, L/N indicating the addition ratio (mass ratio) of softwood pulp and hardwood pulp is, for example, preferably 10/90 to 90/10, more preferably 20/80 or more, further preferably 30/70 or more, further preferably 80/20 or less, and further preferably 70/30 or less.
(optional ingredients)
In the base paper sheet, various chemicals may be added as optional components in order to achieve desired quality and operation stability. Examples of the optional components include dry strength agents, wet strength agents, softening agents, leavening agents, dyes, perfumes, dispersants, drainage improving agents, resin control agents, yield improving agents, and coating agents. Examples of the dry strength agent include cationized starch, Polyacrylamide (PAM), carboxymethylcellulose (CMC), and the like. Examples of the wet strength agent include polyamide epichlorohydrin, urea, melamine, and thermally crosslinkable polyacrylamide. Examples of the softening agent include anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants. The above optional components may be used singly or in combination of two or more.
(basis weight)
The base paper sheet may have a basis weight of 7 to 30g/m, for example, depending on the quality required for tissue paper and sanitary tissue paper2. For example, the basis weight of the base paper sheet is preferably 9g/m2Above and preferably 25g/m2The following. The basis weight can be measured according to the provisions of JIS P8124.
(production method)
The sanitary tissue paper according to the embodiment of the present invention is produced through the following steps,
a step of manufacturing a tissue paper (base paper sheet) as a constituent element thereof and manufacturing a primary base roll (primary raw reverse ロール) on which the base paper sheet is wound;
a step of producing a secondary raw roll for sanitary tissue paper by drawing a base paper sheet from each of a plurality of primary raw rolls on which the base paper sheet is wound, forming a laminated sheet having a multilayer structure by overlapping the plurality of base paper sheets, and winding the laminated sheet around a core;
a step of drawing the laminated sheet from the secondary raw tissue paper roll for a sanitary tissue paper, and processing the laminated sheet into a sanitary tissue paper (product) in a paper bundle form or a paper roll form of a predetermined amount and a predetermined size through steps such as slit processing, embossing, mesh processing, folding, winding, and cutting, as necessary.
Hereinafter, the main manufacturing process of the sanitary tissue paper will be described with reference to the drawings.
(production of tissue paper)
A process of manufacturing a primary raw roll around which a base paper sheet is wound by manufacturing a tissue paper (base paper sheet) applicable to an embodiment of the present invention will be described with reference to fig. 2.
(paper machine)
Fig. 2 schematically shows an example of a paper machine for manufacturing a primary base roll around which a base paper sheet is wound, for manufacturing a tissue paper (base paper sheet) applicable to an embodiment of the present invention.
The paper machine 1 includes a wire section 40, a pressing section 42, a drying section 44, a calender section 45, and a drum section 46.
The wire portion 40 includes: the wire 2 and the wire 3 forming an endless belt, and a headbox 8 for spraying a liquid slurry. In the present embodiment, a double-line forming type paper machine is used, but known paper machines such as a cylinder forming type, a suction preforming type, and a crescent forming type may be used.
The pulp slurry supplied to the paper machine is formed into a slurry state by adding water and optional components such as a paper strength agent as needed to the pulp components and performing beating treatment.
In the wire portion 40, the pulp slurry 9 is thinly discharged from the headbox 8 to the curling portion (nip) of the wires 2 and 3.
Then, the wire rod 2 and the wire rod 3 are pressed against each other by the forming roll 12, and the discharged liquid slurry squeezes out water from meshes of the wire rod 2 and the wire rod 3 to form a wet paper 10. The process in the wire portion 40 is also collectively referred to as a "wet paper web manufacturing process".
Next, the wire 3 rotates, and the wet paper 10 on the wire 3 is conveyed to the pressing portion 42. The pressing portion 42 includes a drying felt 22 formed of a felt into an endless belt, and a plurality of felt rollers disposed in contact with the drying felt 22 and rotating as the drying felt 22 travels.
The wet paper 10 transferred from the wire part 40 is placed on the surface of the drying felt 22, and the moisture of the wet paper 10 is absorbed by the fibers of the drying felt 22, so that the wet paper 10 is dewatered. The process in the pressing portion 42 is also collectively referred to as a "dehydration process".
Next, the wet paper 10 dehydrated by the pressing portion 42 is conveyed to the drying portion 44. The drying section 44 includes a heatable cylindrical yankee dryer 26 to dry the wet paper web 10 and remove water therefrom. That is, the wet paper 10 is pressed against the outer peripheral surface of the yankee dryer 26 into which steam is blown and heated, and dried, thereby turning the wet paper sheet into a sheet in a dried state. An outer cover 28 having a hot air jet port may be provided opposite to the outer peripheral surface of the yankee dryer 26, and the wet paper 10 may be dried by the hot air from the outer cover 28. The sheet dried on the outer peripheral surface of the yankee dryer 26 is applied with very fine corrugated crepe called creping by a creping doctor 29 while being peeled off from the surface of the yankee dryer 26. The process in the drying section 44 is also collectively referred to as a "drying process". In particular, the series of processes associated with applying creping to a sheet of material is also referred to as a "creping process". The purpose of the creping step is to impart flexibility, bulkiness (fluffy feeling), absorbency, etc., beauty (creped shape), hand, etc. to the sheet.
The peeled sheet 31 is conveyed to the calender unit 45. The calender unit includes a pair of calender rolls 53 and 54 that nip and press the sheet 31 from above and below. Thereby, the sheet 31 is compressed, and the sheet thickness is adjusted, made uniform, and the surface is smoothed. This process is also collectively referred to as "calendering.
The sheet 31 conveyed out of the calender unit 45 is then conveyed to the winding drum 46. In the winding drum portion 46, the sheet 31 is fixed to the winding core 38 of the winding drum 34, and the winding drum 34 is rotated to wind the sheet 31. Thereby, a paper tube 36 is obtained by winding the sheet 31 in a roll shape. The process in the winding drum portion 46 is also referred to as a "winding process". The sheet 31 wound in this manner is a tissue paper (base paper sheet) applicable to the embodiment of the present invention.
The paper roll 36 in the form of a wound tissue paper (base paper sheet) 31 can be used as a single wrap paper for producing a sanitary tissue paper according to an embodiment of the present invention.
(production of Secondary base roll for sanitary tissue paper)
Next, a process of producing a secondary raw roll for a sanitary tissue paper according to an embodiment of the present invention from the primary raw roll will be described with reference to fig. 3. In this example, three base paper sheets are laminated to make a three-layer secondary base paper roll. However, the present embodiment is not limited to this, and can be applied to the production of a multilayered secondary raw paper roll in which two or more base paper sheets are stacked.
(laminating machine)
Fig. 3 is a schematic view showing an example of a laminator which can be applied to manufacture a secondary raw roll for sanitary tissue paper according to an embodiment of the present invention.
The base paper sheets 31a, 31b, and 31c drawn from the three primary base paper rolls 36a, 36b, and 36c are stacked by the paper rolls 51 to form a multilayer structure. A laminate 52 of base paper sheets (hereinafter also referred to as "laminate sheet") is cut to a predetermined width by a slitting section 55 as necessary and guided by a winding cylinder 56 to form a roll on a winding core. As a result, as shown in the side view of fig. 4 (a), a secondary raw tissue roll 58 for sanitary tissue, in which the laminated sheet 52 is wound in a roll shape, is obtained. Fig. 4 (b) is a partially enlarged view of the laminated sheet 52 showing the portion ivb of fig. 4 (a). As shown in fig. 4 (b), the laminated sheet 52 is formed by stacking a plurality of base paper sheets 31. In this example, three base paper sheets 31 are stacked, but the number of sheets is for illustration and is not intended to limit the present invention.
The sanitary tissue paper obtained in this way is used for product processing with the secondary parent roll 58. Specifically, the laminated sheet is drawn from the secondary raw tissue roll for sanitary tissue paper, and is processed into a sanitary tissue paper in a bundle form or a roll form of sanitary tissue paper in a predetermined amount and a predetermined size through steps such as slit processing, embossing, mesh processing, folding, winding, and cutting, as necessary.
(second embodiment)
A second embodiment of the present invention will be described with reference to fig. 1 (b). Unless otherwise specified, the configuration applicable to the first embodiment can be applied to the present embodiment. The present embodiment can be applied to sanitary tissue paper having a multi-layered structure in which a plurality of three or more pieces of tissue paper are stacked. The number of sheets of tissue paper constituting the sanitary tissue paper according to the present embodiment is not limited to the example shown in the figure, and may be three, four, five or more sheets, that is, the multi-ply may be three, four, five or more plies.
As described above, the sanitary tissue paper shown in fig. 1 (b) has a three-layer structure in which three sheets of tissue paper (tissue paper 101, tissue paper 201, and tissue paper 301) are laminated. Tissue 101 and tissue 301 each form the outer layer of the three-ply structure. Tissue paper 101 and tissue paper 201 are overlapped adjacent to each other, and tissue paper 101 forming one outer layer has a shorter water absorption time and a larger water diffusion area than tissue paper 201 adjacent thereto.
In addition, in the second embodiment, the tissue paper 301 and the tissue paper 201 are overlapped so as to be adjacent to each other, and the tissue paper 301 forming the other outer layer has a shorter water absorption time and a larger water diffusion area than the adjacent tissue paper 201.
That is, the sanitary tissue paper according to the second embodiment is configured such that each of two pieces of tissue paper (tissue paper 101, tissue paper 301) forming an outer layer of a multi-layered structure in which a plurality of pieces of tissue paper are stacked has a shorter water absorption time and a larger water diffusion area than the adjacent piece of tissue paper (tissue paper 201). As long as this requirement is satisfied, the two tissues (tissue 101 and tissue 301) may be the same or different regardless of the relationship between the length of the water absorption time and the size of the water diffusion area between the two tissues (tissue 101 and tissue 301) forming the two outer layers.
(Effect)
The effects when using sanitary tissue paper are the same as those described in the first embodiment, so that one side of the outer-layer tissue paper having a shorter water absorption time and a larger water diffusion area is used as the water wiping surface than the adjacent tissue paper. That is, according to the embodiment of the present invention, a sanitary tissue paper having excellent water absorbency and excellent water wiping property can be provided. In the second embodiment, since the sanitary tissue paper has the outer layer tissue paper having a shorter water absorption time and a larger water diffusion area on both sides than the adjacent tissue paper, there is no need to particularly define the wiping surface of the moisture, and the effect of further improving the degree of freedom in use at the time of wiping the moisture can be obtained.
The operation and effect of the second embodiment of the present invention are described above with reference to the sanitary tissue paper having a three-layer structure shown in fig. 1 (b).
The present embodiment can also be applied to a sanitary tissue paper having a four-layer structure shown in fig. 1 (c). In the sanitary tissue paper shown in fig. 1 (c), each of two tissue papers (tissue paper 101 and tissue paper 501) forming the outer layer of a multi-layered structure (four-layered structure) in which a plurality of (four) tissue papers are stacked may have a shorter water absorption time and a larger water diffusion area than the adjacent tissue paper (tissue paper 201 and 401). The requirement is satisfied regardless of the relationship between the length of the water absorption time and the size of the water diffusion area between the two sheets of tissue paper (tissue paper 101 and tissue paper 501) forming the two outer layers. Further, the relationship between the length of the water absorption time and the size of the water diffusion area between two pieces of tissue paper (tissue paper 201 and tissue paper 401) adjacent to each of the two pieces of tissue paper (tissue paper 101 and tissue paper 501) forming the two outer layers is not related. The two outer sheets of tissue paper (tissue paper 101 and tissue paper 501) may be the same or different. The two sheets of tissue (tissue 201, tissue 401) adjacent to the two sheets of tissue (tissue 101, tissue 501) in the outer layer may be the same or different.
In addition, in both the front and back surfaces of the sanitary tissue paper, the combination of the tissue paper forming the outer layer and the tissue paper adjacent thereto is configured similarly, so that it is not necessary to particularly define the wiping surface for moisture, and the effect of the present embodiment, such as the degree of freedom in use at the time of moisture wiping, can be further improved. In addition, in the sanitary tissue paper, the combination of the tissue paper forming the outer layer and the tissue paper adjacent thereto is configured to be different between the front and back surfaces, thereby ensuring excellent water absorbency and water wiping property and imparting different functions to the front and back surfaces.
Similarly, the present embodiment can be applied to a sanitary napkin having a multilayer structure of five or more layers, not shown. Each of the two tissue papers forming the outer layer of the multi-layer structure has a property of short water absorption time and a large water diffusion area as compared with the adjacent tissue paper, and the operational effects of the present invention as described above can be produced. In this case, the tissue paper included in the multi-layered structure is not dependent on the length of the water absorption time and the size of the water diffusion area of the tissue paper forming the outer layer and the other tissue paper different from the adjacent tissue paper.
(other embodiments)
Unless otherwise specified, the configurations applicable to the first and second embodiments can be applied to this embodiment as well. The present embodiment can be applied to sanitary tissue paper having a multi-layer structure in which two or more pieces of tissue paper are stacked.
(mode of realisation of the utility model)
In order to realize the sanitary tissue paper according to the above-described embodiment of the present invention, at least two kinds of tissue paper having different water absorption time and water diffusion area are required. Specifically, at least two types of tissue paper having a relatively short water absorption time and a relatively large water diffusion area and another tissue paper having a relatively long water absorption time and a relatively small water diffusion area are required.
(implementation method)
Examples of the method for obtaining two kinds of tissue paper having such a relationship include a method for obtaining two kinds of tissue paper by making the raw materials different, a method for obtaining two kinds of tissue paper by making the conditions other than the raw materials different, and a method for combining these methods arbitrarily.
(method of realizing raw Material)
Examples of the method for obtaining two kinds of tissue paper by differentiating the raw material include a method of adjusting the ratio (L/N ratio) of softwood pulp and hardwood pulp added to the pulp component, a method of adjusting the kind and amount of chemicals (e.g., softening agent, coating agent, etc.), and a method of combining these methods arbitrarily.
(adjustment of L/N ratio)
In the case of the method of adjusting the L/N ratio, the higher the addition ratio of hardwood pulp (L), the smaller the water diffusion area of the tissue paper tends to be, and the higher the addition ratio of softwood pulp (N), the larger the water diffusion area of the tissue paper tends to be, when other conditions are the same. Therefore, in the one tissue paper used for the outer layer, the water diffusion area can be adjusted by increasing the addition ratio of softwood pulp compared to the other tissue paper adjacent thereto.
(adjustment of the type and amount of addition of the drug)
When a method of adjusting the type and the amount of a chemical (for example, a softening agent, a coating agent, or the like) is used, the mode to be used differs depending on the characteristics of the chemical. When the softening agent is used to impart softness by introducing an oil base into a pulp component, the more the softening agent is added, the longer the water absorption time of the tissue paper tends to be. In this case, the water absorption time can be adjusted by reducing the amount of the softening agent added to the outer layer tissue paper compared to the adjacent tissue paper. Further, the coating agent is added mainly for imparting water repellency, and the more the amount of the coating agent added, the longer the water absorption time of the tissue paper tends to be. In this case, the water absorption time can be adjusted by reducing the amount of the coating agent added to the outer layer tissue paper compared to the adjacent tissue paper. In addition, the water absorption time of the two tissues can be adjusted simply by using chemicals having different characteristics.
(means for realizing other than raw material)
Further, as a method for obtaining two kinds of tissue paper by making conditions other than the raw material different, for example, adjustment of a crepe ratio, adjustment of a jet and wire ratio (J/W ratio), adjustment of density, adjustment of paper thickness, adjustment of a processing direction, and the like can be cited.
(adjustment of wrinkling Rate)
A method for obtaining two kinds of tissue paper by adjusting the creping rates of the tissue paper will be described with reference to fig. 2 and 5.
< wrinkling Rate >
The creping rate of the tissue paper of the present embodiment is defined based on the difference in the peripheral speed between the yankee dryer and the winding drum of the paper machine (the peripheral speed of the winding drum ≦ the peripheral speed of the yankee dryer), and is calculated by the following formula (I).
Creping rate (%) > 100 × (peripheral speed of yankee dryer (m/min) — peripheral speed of winding reel (m/min))/(I) peripheral speed of winding reel (m/min) · · ·
Referring to fig. 2, specifically, in the paper machine 1, the creping rate of the base paper sheet (tissue paper) 31 obtained can be adjusted by changing either or both of the peripheral speed of the yankee dryer 26 and the peripheral speed of the winding drum 34.
From the viewpoint of ensuring the required quality and workability, the creping ratio of each tissue paper may be, for example, 10% to 40%. For example, the creping rate of each tissue paper is preferably 28% or less, and more preferably 26% or less. The creping ratio of each tissue paper is preferably 15% or more, for example. When the wrinkling ratio is within the above range, an appropriate uneven structure can be provided on the surface, and a favorable texture and water absorption can be obtained, and a decrease in durability in use can be prevented.
Fig. 5 (a) and (b) are photographs under a microscope showing tissue papers having different creping densities, which are obtained by varying the creping rates in the production of the tissue papers.
< crinkling Density >
The crepe density of the tissue paper according to the present invention is the number of raised ridges on a line segment having a unit length of 1cm in the MD direction of the surface of the tissue paper. The crinkling density can be determined in the following manner. First, a magnified image of the sheet surface was taken using an optical microscope. The magnification may be a magnification that can be used to confirm the number of raised ridges, and may be, for example, about 40 times. In order to easily confirm the ridges from the captured image, the imaging surface may be irradiated with light, and shadows may be formed on the surface of the tissue paper by the light. Next, the number of ridges on a line segment having a unit length of 1cm (original size) in the MD direction was visually counted from the captured image. When the size of the captured image is smaller than 1cm in the MD direction, the number of ridges formed on a line segment of a predetermined length (actual size) in the MD direction can be visually counted, and the number of ridges per 1cm in the MD direction per unit length can be calculated based on the number. For example, the number of ridges on a line segment of 0.5cm (actual size) in the MD direction can be visually counted, and the number of ridges per unit length of 1cm in the MD direction can be calculated by 2 times the counted number. The measurement value is an average value of (three lines) at arbitrary three points in the captured image.
The tissue paper shown in fig. 5 (a) had a creping density of 48 strips/cm, and the tissue paper shown in fig. 5 (b) had a creping density of 40 strips/cm. In this case, the wrinkle density is obtained by visually counting the number of ridges on a 0.5cm (actual size) line segment in the MD direction from the captured image shown in fig. 5, and calculating the number of wrinkles per unit length of 1cm in the MD direction by 2 times the counted number.
The present inventors have found that, under the same other conditions, the higher the crepe density, the larger the water diffusion area of the tissue paper and the shorter the water absorption time, and the lower the crepe density, the smaller the water diffusion area of the tissue paper and the longer the water absorption time. Further, there is a tendency that the higher the creping ratio, the higher the creping density is, and the lower the creping ratio, the lower the creping density is. The crepe density of the tissue paper can be controlled by adjusting the crepe ratio in the manufacture of the tissue paper.
In one embodiment of the present invention, a tissue paper having a relatively high creping density as shown in fig. 5 (a) is used as the tissue paper forming the outer layer of the multi-layer structure, and a tissue paper having a relatively low creping density as shown in fig. 5 (b) is used as the tissue paper adjacent to the tissue paper forming the outer layer of the multi-layer structure. Thereby, the following sanitary tissue paper can be obtained: at least one of two tissue papers forming the outer layer of the multi-layer structure has a shorter water absorption time and a larger water diffusion area than the adjacent tissue paper.
According to the present embodiment, a plurality of sheets of tissue paper having a desired relationship between water absorption time and water diffusion area can be easily obtained by simply adjusting the creping ratio without changing other conditions. Further, the crepe density of the tissue paper can be used as an index of the possibility of producing sanitary tissue paper suitable for the tissue paper.
The crepe density of the tissue paper forming the outer layer is preferably 30 to 60 strips/cm, and more preferably 35 to 55 strips/cm. The crepe density of the tissue paper adjacent to the tissue paper forming the outer layer is lower than the crepe density of the tissue paper forming the outer layer, preferably 20 to 50 strips/cm, and more preferably 25 to 45 strips/cm.
In one example, by adjusting the creping rate of each tissue paper to 15 to 25%, for example, a plurality of tissue papers having a creping density in the range of 40 to 50 strips/cm, which can be applied to the present embodiment, can be obtained.
(adjustment of J/W ratio)
Referring to FIG. 2, a method for obtaining two types of tissue paper by adjusting the J/W ratio will be described.
(J/W ratio)
Referring to fig. 2, in the wire section 40, when the discharge speed (also referred to as the flow speed of the papermaking water and the slurry supply speed) at which the liquid slurry 9 is discharged from the headbox 8 is defined as the jet speed (J) and the running speed of the wire is defined as the wire speed (W), the jet and wire ratio (J/W ratio) is a speed ratio of the two.
The J/W ratio is an index for managing the fiber orientation in tissue paper. If the jetting speed (J) is slow and the wire speed (W) is fast, the J/W ratio is less than 1. In contrast, if the jetting speed (J) is fast and the wire speed (W) is slow, the J/W ratio is greater than 1. In either case, the resulting tissue tends to have fiber orientation in the MD direction. If the J/W ratio is close to 1, the fiber orientation in the tissue paper shows relative isotropy.
Therefore, when water droplets are dropped onto the manufactured tissue paper, the smaller the J/W ratio is, the more likely the water is to diffuse in the MD direction of the fiber orientation when the J/W ratio is less than 1, or the larger the J/W ratio is, the more likely the water is to diffuse in the MD direction of the fiber orientation when the J/W ratio is greater than 1. On the other hand, if the J/W ratio is close to 1, the moisture is easily absorbed in the thickness direction of the tissue paper, and relatively, is not easily diffused in the MD direction.
Therefore, the water diffusion area can be adjusted by comparing the outer-layer tissue paper with the adjacent tissue paper because the tissue paper is manufactured under the condition that the J/W ratio is different. The J/W ratio can be controlled by adjusting one or both of the jetting speed and the wire speed.
(adjustment of Density)
A method for obtaining two kinds of tissue paper by adjusting the density of the tissue paper will be described.
(Density)
The density of the tissue paper can be obtained from the basis weight and the paper thickness of the tissue paper, and is calculated by the following equation (II).
Density (g/cm)3) Basis weight (g/m)2) Paper thickness (mum) · (II)
The density of each tissue paper can be set to 0.050 to 0.300g/cm, for example, in consideration of the quality requirements of the tissue paper and sanitary tissue paper3. For example, the density of the tissue paper is preferably 0.100g/cm3Above and 0.200g/cm3The following.
The density of the tissue paper can affect the water permeability. In the case of the method for adjusting the density, the water absorption time tends to be shorter as the density is lower and to be longer as the density is higher, under the same other conditions. Therefore, in one tissue paper used for the outer layer, the water absorption time can be adjusted by lowering the density compared to other tissue paper adjacent thereto.
Referring to fig. 2, the density of the tissue paper can be adjusted by, for example, a method of adjusting the paper thickness by changing the pressing conditions in the calender unit 45, a method of adjusting the basis weight by changing the amount of the pulp slurry 9 discharged from the headbox 8 in the wire unit 40, or a combination of these methods.
(adjustment of paper thickness)
A method for obtaining two kinds of tissue paper by adjusting the thickness of the tissue paper will be described.
(paper thickness)
The thickness of the tissue paper is measured according to the specification of JIS PJ 8118 (2014).
The thickness of each tissue paper can be, for example, 30 to 250 μm in consideration of the quality requirements of the tissue paper and sanitary tissue paper. For example, the thickness of the tissue paper is preferably 50 μm or more and 200 μm or less.
In the case of tissue paper having the same basis weight, the thinner the paper thickness, the higher the density, and the thicker the paper thickness, the lower the density. As described above, the lower the density of the tissue paper, the shorter the water absorption time tends to be, and the higher the density, the longer the water absorption time tends to be. Therefore, when the basis weights of the tissue papers are the same, the thickness of one tissue paper used for the outer layer can be increased as compared with other adjacent tissue papers, thereby shortening the water absorption time and further adjusting the water absorption time.
(adjustment of working Direction)
A method for obtaining two kinds of tissue paper by adjusting the processing direction of the tissue paper will be described with reference to fig. 2, 3, and 4.
A tissue paper (base paper sheet) 31 manufactured by the paper machine 1 of fig. 2 is wound around the primary base paper roll 36 such that a yankee surface, which is a surface pressed against the outer peripheral surface of the yankee dryer 26, forms the winding outer side of the primary base paper roll 36, and a non-yankee surface, which is a surface opposite to the yankee surface, forms the inner side of the primary base paper roll 36.
In order to easily peel off the dried sheet 31, a release agent is used in the outer peripheral surface of the yankee dryer 26. Therefore, the yankee surface of the tissue paper has the release agent adhered thereto, and thus the water diffusion area becomes smaller in the yankee surface than in the non-yankee surface. Therefore, in the step of laminating a multi-layered structure (laminated sheet) in which a plurality of pieces of tissue paper (base paper sheets) are laminated, the tissue paper forming the outer layer of the multi-layered structure is arranged in such a direction that the non-yankee surface having a relatively large water diffusion area forms the outer side of the multi-layered structure, whereby the water diffusion area of the tissue paper in the outer layer can be increased. In this case, the tissue paper adjacent to the tissue paper of the outer layer is arranged in such an orientation that the yankee surface having a relatively small water diffusion area is in contact with the tissue paper of the outer layer, so that a difference in water diffusion area with respect to the surface on the side where water is wiped off can be provided between the outer tissue paper and the tissue paper adjacent thereto.
In the example shown in fig. 3 and 4, in the lamination process of forming the multi-layer structure (laminated sheet) 52 by stacking a plurality of sheets of tissue paper (base paper sheets) 31, the tissue paper 31a and the tissue paper 31c for forming the outer layer of the multi-layer structure 52 are arranged so that the yankee surfaces having relatively small water diffusion areas face the outer side of the multi-layer structure. In contrast, in the laminator shown in fig. 3, the direction of drawing the base paper sheets 31a and 31c of the primary base roll 36a and the primary base roll 36c is set to be opposite to each other, so that the non-yankee surface is set to the outside, and the direction of arrangement of the tissue paper for forming the outer layer can be set to be opposite to each other. Alternatively, in the paper machine shown in fig. 2, the base paper sheet 31 is wound so that the yankee surface is positioned opposite to the winding direction and the base paper sheet 31 is wound so that the inner side of the primary base paper roll 36, and therefore, in the laminator shown in fig. 3, the tissue paper for forming the outer layer of the multi-layer structure can be arranged so that the non-yankee surface having a relatively large water diffusion area is positioned toward the outer side of the multi-layer structure without the base paper sheet 31a and the base paper sheet 31c being positioned opposite to each other in the drawing direction. Thus, the water diffusion area can be adjusted by adjusting the processing direction. It should be noted that the processing directions in the above description are only examples, and are not intended to limit the present invention.
In the above, various methods for obtaining two kinds of tissue paper having a relationship that one kind of tissue paper has a shorter water absorption time and a larger water diffusion area than the other kind of tissue paper have been described in relation to the mode of carrying out the present invention.
In one embodiment of the present invention, at least one of the crepe ratio, the L/N ratio, the density, the paper thickness, the type and amount of chemicals (for example, softening agent, coating agent, etc.), the J/W ratio, and the processing orientation (yankee/non-yankee) is adjusted. Preferably, in one embodiment of the present invention, only the wrinkling rate is adjusted, making the other conditions the same. According to this embodiment, the adjustment can be very easily performed.
In one embodiment of the present invention, at least two of the crepe ratio, the L/N ratio, the density, the paper thickness, the type of the chemical (e.g., softener, coating agent, etc.) and the amount added thereof, the J/W ratio, and the processing orientation (yankee/non-yankee) are adjusted. Preferably, in one embodiment of the present invention, the other conditions are made the same, and the L/N ratio and the density are adjusted. In this embodiment, a tissue paper having a relatively high addition ratio of softwood pulp and a relatively low density is used as the tissue paper forming the outer layer, and a tissue paper having a relatively high addition ratio of hardwood pulp and a relatively high density is used as the tissue paper adjacent thereto, so that a desired relationship between the water absorption time and the water diffusion rate can be easily achieved. In one embodiment of the present invention, it is preferable to adjust the processing direction and the density by setting the other conditions to be the same. As described above, according to the embodiment of the present invention, by adjusting a small number of parameters, a desired relationship between the water absorption time and the water diffusion rate can be easily realized.
(use of utility model)
Examples of the sanitary tissue paper to which the present invention can be applied include household paper, dusting paper, paper towel, kitchen paper, toilet paper, and the like.
The sanitary tissue paper according to the embodiment of the present invention is preferably used for "removing/removing" purposes accompanied by "wiping" or "wiping/wiping" action. In addition, the present invention may be used only for "contact" and "removal" without involving the "wiping/wiping" operation.
Description of the symbols
1 paper machine
2. 3 wire rod
8 pulp flow box
9 pulp slurry
10 wet paper
12 forming roller
22 drying felt
26 Yankee dryer
28 outer cover
31 sheet/base paper
34 winding drum
36 paper tube
38 roll core
40 wire part
42 pressing part
44 drying section
45 calender part
46 reel part
51 paper roll
52 laminated sheet
53 calender roll
54 calender roll
55 longitudinal cutting part
56 paper reeling cylinder
58 Secondary base paper roll
101. 201, 301, 401, 501 tissue.
Claims (3)
1. A sanitary tissue paper having a multi-layered structure of a plurality of tissue papers stacked one upon another,
at least one of the two tissue papers forming the outer layer of the multi-layer structure among the plurality of tissue papers has a water absorption time of 5 to 18 seconds and a water diffusion area of 1700mm2In the above-mentioned manner,
the water absorption time of the adjacent tissue paper is longer than the water absorption time of the at least one tissue paper, and the water diffusion area is smaller than the water diffusion area of the at least one tissue paper.
2. The sanitary tissue paper according to claim 1,
the plurality of sheets is three or an integer greater than three,
the water absorption time of each of two pieces of tissue paper forming the outer layer of the multi-layer structure in the plurality of pieces of tissue paper is 5-18 seconds, and the water diffusion surface is 1700mm2In the above-mentioned manner,
the water absorption time of the adjacent tissue paper is longer than that of each tissue paper, and the water diffusion area is smaller than that of each tissue paper.
3. The sanitary tissue paper according to claim 1 or 2,
at least one of the two tissues forming the outer layer of the multi-layered structure among the plurality of tissues has a higher crepe density than the tissue adjacent thereto, so that the water absorption time is short and the water diffusion area is large compared to the tissue adjacent thereto.
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| JP2020-048944 | 2020-03-19 | ||
| JP2020048944A JP6863499B1 (en) | 2020-03-19 | 2020-03-19 | Sanitary tissue paper |
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| CN216060321U true CN216060321U (en) | 2022-03-18 |
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| CN202023328732.3U Active CN216060321U (en) | 2020-03-19 | 2020-12-30 | Sanitary tissue paper |
| CN202011604581.1A Pending CN113491462A (en) | 2020-03-19 | 2020-12-30 | Sanitary tissue paper |
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| CN (2) | CN216060321U (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3457417B2 (en) * | 1995-04-17 | 2003-10-20 | 花王株式会社 | Absorbent paper, method for producing the same, and absorbent article using the same |
| JP3419644B2 (en) * | 1997-03-10 | 2003-06-23 | ユニ・チャーム株式会社 | Wiping sheet and method of manufacturing the same |
| JP2002172072A (en) * | 2000-12-08 | 2002-06-18 | Crecia Corp | Toilet paper suitable for warm water washing toilet seat |
| JP2005342275A (en) * | 2004-06-04 | 2005-12-15 | Daio Paper Corp | Hygienic tissue paper for household use |
| JP4533806B2 (en) * | 2005-06-06 | 2010-09-01 | 大王製紙株式会社 | Water-degradable sanitary paper |
| JP2007075523A (en) * | 2005-09-16 | 2007-03-29 | Daio Paper Corp | Hydrolyzable sanitary paper |
| JP2009056059A (en) * | 2007-08-31 | 2009-03-19 | Pilot Corporation | Antifouling sheet |
| KR101712690B1 (en) * | 2009-12-28 | 2017-03-06 | 다이오 페이퍼 코퍼레이션 | Method of manufacturing secondary whole roll for tissue paper product |
| JP6105877B2 (en) * | 2012-08-31 | 2017-03-29 | 日本製紙クレシア株式会社 | Sanitary tissue paper |
| CN109528052A (en) * | 2017-09-22 | 2019-03-29 | 金红叶纸业集团有限公司 | Paper for daily use |
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| JP2021145915A (en) | 2021-09-27 |
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