Non-woven fabric for wet wipes, wet wipe, package for wet wipes, and use of waterproof cellulose-based fibers

Abstract

The purpose of the present invention is to provide a non-woven fabric for wet wipes, which is formed from a non-woven fabric and has excellent wet wipe removal properties. The non-woven fabric is a non-woven fabric for wet wipes, and the non-woven fabric is characterized in that the non-woven fabric contains waterproof cellulose-based fibers.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a nonwoven fabric for wet wipes, a wet wipe, a package of wet wipes, and use of a water-repellent cellulose-based fiber. BACKGROUND

[0002] In a package of wet wipes, wet paper towels, or the like, particularly in a pop-up type package, when one wet wipe is taken out from the package, sometimes, multiple wet wipes including the next wet wipe are taken out at once (hereinafter sometimes referred to as "multiple wet wipe taking-out tendency").

[0003] Research was conducted to solve the problem involved in such multiple wet wipe taking-out tendency.

[0004] For example, in Patent Literature 1, a wet wipe is disclosed, which comprises a nonwoven fabric manufactured by a wet method and a medicinal liquid impregnated into the nonwoven fabric, characterized in that the nonwoven fabric comprises 5 to 40 mass% of synthetic fibers having a specific gravity exceeding 1.0 of the nonwoven fabric and 60 to 95 mass% of cellulose-based fibers of the nonwoven fabric, and the synthetic fibers comprise 20 to 100 mass% of synthetic fibers having a deformed cross-sectional shape of the synthetic fibers.

[0005] In addition, in Patent Literature 2, a wet wipe is disclosed, which comprises a nonwoven fabric and a medicinal liquid impregnated into the nonwoven fabric, characterized in that the nonwoven fabric comprises a hydrophobic fiber, the medicinal liquid comprises (i) a cationic surfactant; (ii) a low HLB surfactant having an HLB of 3.0 to 7.0; and (iii) water.

[0006] PRIOR ART DOCUMENTS

[0007] PATENT LITERATURE

[0008] Patent Literature 1: Japanese Patent Application Publication No. 2014-94188

[0009] Patent Literature 2: Japanese Patent Application Publication No. 2022-92982 SUMMARY

[0010] PROBLEMS TO BE SOLVED BY THE INVENTION

[0011] The wet wipe of the present disclosure is not disclosed in Patent Literature 1 and Patent Literature 2.

[0012] An object of the present disclosure is to provide a nonwoven fabric for wet wipes, which is excellent in taking-out property of a wet wipe formed of the nonwoven fabric.

[0013] MEANS FOR SOLVING THE PROBLEMS

[0014] The present inventors found a nonwoven fabric, which is a nonwoven fabric for wet wipes, characterized in that the nonwoven fabric comprises a water-repellent cellulose-based fiber.

[0015] Inventive Effects

[0016] The nonwoven fabric for wet wipes of the present disclosure makes the wet wipes formed of the nonwoven fabric excellent in extractability. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a view for explaining a package 1 of a wet wipe of a first embodiment.

[0018] Figure 2 is a view of an end surface at II-II end surface of the package 1 of the wet wipe.

[0019] Figure 3 is a view for explaining a plurality of wet wipes 9.

[0020] Figure 4 is a view of an end surface of the package 1 of the wet wipe of a second embodiment. DETAILED DESCRIPTION

[0021] Specifically, the present disclosure relates to the following aspects.

[0022] [Aspect 1]

[0023] A nonwoven fabric is a nonwoven fabric for wet wipes, characterized by comprising a water-repellent cellulose-based fiber.

[0024] The nonwoven fabric comprises a water-repellent cellulose-based fiber.

[0025] The nonwoven fabric comprises a water-repellent cellulose-based fiber. The water-repellent cellulose-based fiber is a cellulose-based fiber having water repellency, and can exhibit water repellency, but once wet, can retain a certain amount of water inside the fiber, and has a certain water-swellability.

[0026] The water-repellent cellulose-based fiber has higher liquid retention and equivalent or higher water repellency than a synthetic fiber, a hydrophobic fiber, or the like (hereinafter sometimes referred to as "hydrophobic fiber or the like") having hydrophobicity and not retaining water. Therefore, the nonwoven fabric comprising the water-repellent cellulose-based fiber according to the present application has (i) higher liquid retention and (ii) equivalent or higher water repellency due to the characteristics of the water-repellent cellulose-based fiber, as compared to a nonwoven fabric comprising a hydrophobic fiber or the like instead of the water-repellent cellulose-based fiber. As a result, in the wet wipes formed of the nonwoven fabric comprising the water-repellent cellulose-based fiber, adjacent wet wipe portions are less likely to adhere to each other and are easily separated, as compared to the wet wipes formed of the nonwoven fabric comprising a hydrophobic fiber or the like instead of the water-repellent cellulose-based fiber.

[0027] Furthermore, the aforementioned waterproof cellulose fibers possess the same liquid retention and higher water resistance as ordinary cellulose fibers that have not undergone waterproofing treatment (hereinafter, to distinguish them from waterproof cellulose fibers, "ordinary cellulose fibers that have not undergone waterproofing treatment" are sometimes referred to as "hydrophilic cellulose fibers"). Therefore, compared to nonwoven fabrics containing hydrophilic cellulose fibers instead of waterproof cellulose fibers, the nonwoven fabric containing waterproof cellulose fibers according to the present application possesses (i) the same liquid retention and (ii) higher water resistance due to the characteristics of waterproof cellulose fibers. As a result, in wet wipes formed from nonwoven fabrics containing the aforementioned waterproof cellulose fibers, adjacent wipe portions are less likely to adhere to each other and are more easily separated compared to wet wipes formed from nonwoven fabrics containing hydrophilic cellulose fibers instead of waterproof cellulose fibers.

[0028] For example, when a wet wipe made of the aforementioned nonwoven fabric is folded along a fold line, adjacent wet wipe portions within the fold line are difficult to adhere to each other and easily separate, making unfolding from the folded state easier. Furthermore, when multiple wet wipes made of the aforementioned nonwoven fabric are stacked, adjacent wet wipe portions in the stacking direction are difficult to adhere to each other and easily separate, making it less likely to remove multiple wet wipes at once, including the next one, when taking out a single wet wipe. Moreover, there is a tendency that the more liquid the wet wipe retains, the higher this tendency to remove multiple wipes becomes.

[0029] Based on the above, the wet wipes formed from the aforementioned nonwoven fabric have excellent removability.

[0030] Furthermore, since the waterproof cellulose fibers contained in the aforementioned nonwoven fabric are biodegradable, the aforementioned nonwoven fabric and the wet wipes formed from the aforementioned nonwoven fabric are more biodegradable than nonwoven fabrics containing hydrophobic fibers instead of waterproof cellulose fibers, thus reducing environmental impact.

[0031] [Form 2]

[0032] According to the nonwoven fabric of form 1, the nonwoven fabric is characterized in that it has a water absorption rate of 60-110 mm based on the Klem method.

[0033] Because the aforementioned nonwoven fabric has a specified absorbency based on the Klem method, the wet wipes formed from the aforementioned nonwoven fabric are difficult to stick together and are easy to separate, resulting in excellent removability of the wet wipes formed from the aforementioned nonwoven fabric.

[0034] [Form 3]

[0035] The nonwoven fabric according to form 1 or 2 is characterized in that the nonwoven fabric contains 10 to 35% by mass of the waterproof cellulose fibers.

[0036] Since the aforementioned nonwoven fabric contains a specified amount of waterproof cellulose fibers, the wet wipes formed from the aforementioned nonwoven fabric are difficult to stick together and are easy to separate, resulting in excellent removability of the wet wipes formed from the aforementioned nonwoven fabric.

[0037] [Form 4]

[0038] The nonwoven fabric according to any one of forms 1 to 3 is characterized in that the waterproof cellulose fibers have a water swelling capacity of 10 to 80% by mass.

[0039] In the aforementioned nonwoven fabric, since the waterproof cellulose fibers have a specified water swelling property, the wet wipes formed from the aforementioned nonwoven fabric are difficult to adhere to each other and are easy to separate, resulting in excellent removability of the wet wipes formed from the aforementioned nonwoven fabric.

[0040] [Form 5]

[0041] The nonwoven fabric according to any one of forms 1 to 4 is characterized in that,

[0042] The nonwoven fabric includes a first surface layer and a second surface layer constituting the surface of the nonwoven fabric, and an intermediate layer disposed between the first surface layer and the second surface layer.

[0043] The first surface layer and the second surface layer each contain the aforementioned waterproof cellulose fibers.

[0044] The intermediate layer contains heat-fused fibers.

[0045] Because the aforementioned nonwoven fabric has a defined structure and both the first and second surface layers contain waterproof cellulose fibers, the wet wipes formed from this nonwoven fabric are easily separated from each other, making them easy to remove. Furthermore, because the intermediate layer contains heat-fused fibers, the wet wipes formed from this nonwoven fabric exhibit excellent wettability, and the user hardly feels any stiffness from the heat-fused fibers.

[0046] [Form 6]

[0047] According to the nonwoven fabric of form 5, the thermally bondable fiber comprises a biodegradable thermally bondable fiber.

[0048] In the aforementioned nonwoven fabric, since the aforementioned heat-fused fibers contain biodegradable heat-fused fibers, the aforementioned nonwoven fabric and wet wipes are prone to biodegradability.

[0049] [Form 7]

[0050] The nonwoven fabric according to form 5 or 6 is characterized in that the first surface layer and the second surface layer are respectively composed of cellulose fibers.

[0051] In the aforementioned nonwoven fabric, since the first surface layer and the second surface layer are respectively composed of cellulose fibers, the medicine is easily retained in the first surface layer and the second surface layer in the wet wipe formed from the aforementioned nonwoven fabric, and the wiping performance of the wet wipe easily becomes excellent.

[0052] [Form 8]

[0053] The nonwoven fabric according to any one of forms 5 to 7 is characterized in that the intermediate layer further comprises pulp fibers.

[0054] In the aforementioned nonwoven fabric, since the intermediate layer also contains pulp fibers, the amount of medication in the intermediate layer of the wet wipe formed from this nonwoven fabric is relatively higher, while the amount of medication in the first and second surface layers is relatively lower. As a result, the amount of medication on the surfaces of the wet wipe portions (the first and second surface layers) is relatively lower, making it difficult for the wet wipe portions to adhere to each other and allowing for easy separation. This results in excellent removability of the wet wipe formed from the aforementioned nonwoven fabric.

[0055] [Form 9]

[0056] A wet wipe, characterized in that the wet wipe comprises a non-woven fabric sheet and a medicinal liquid, wherein the non-woven fabric sheet is composed of a non-woven fabric of any one of forms 1 to 8.

[0057] The aforementioned wet wipes have the effects disclosed in Form 1.

[0058] [Form 10]

[0059] A wet wipe packaging body, wherein a plurality of wet wipes are stored inside a packaging body having a bottom and an opening at the top, characterized in that,

[0060] At least a portion of the plurality of wet wipes are composed of the wet wipes described in form 9.

[0061] The plurality of wet wipes are stacked in a direction from the bottom to the top.

[0062] The packaging of the aforementioned wet wipes has the effect disclosed in form 1.

[0063] [Form 11]

[0064] The packaging of the wet wipes according to form 10 is characterized in that,

[0065] The plurality of wet wipes are configured such that the top end of the bottom-side wet wipe located on the bottom side and the bottom end of the top-side wet wipe adjacent to the top side of the bottom-side wet wipe overlap each other in such a way that the top end of the bottom-side wet wipe is positioned closer to the top side than the bottom end of the top-side wet wipe.

[0066] The aforementioned wet wipes packaging allows for easy removal of multiple wipes at a specified height. Therefore, users can easily retrieve the required number of wipes and easily take out the next wipe.

[0067] [Form 12]

[0068] A waterproof cellulose fiber for use in adjusting the removability of wet wipes.

[0069] In the above-mentioned use, the waterproof cellulose fibers can adjust the removability of the wet wipes.

[0070] The following provides a detailed description of the nonwoven fabric for wet wipes (hereinafter sometimes referred to as "nonwoven fabric"), wet wipes, and the packaging body for wet wipes (hereinafter sometimes referred to as "packaging body").

[0071] [Non-woven fabric]

[0072] The nonwoven fabric disclosed herein is a nonwoven fabric for wet wipes, comprising waterproof cellulose fibers. Waterproof cellulose fibers are cellulose fibers that are waterproof, but once wet, they can retain a certain amount of moisture within the fibers, exhibiting a certain degree of water swelling.

[0073] Therefore, in the wet wipes formed from the aforementioned nonwoven fabric containing waterproof cellulose fibers, compared with wet wipes formed from nonwoven fabric containing hydrophobic fibers instead of waterproof cellulose fibers, and compared with wet wipes formed from nonwoven fabric containing hydrophilic cellulose fibers instead of waterproof cellulose fibers, adjacent wet wipe portions are difficult to adhere to each other and are easily separated.

[0074] Furthermore, since the aforementioned waterproof cellulose fibers possess a certain degree of water swelling, the wet wipes formed from this nonwoven fabric tend to retain medication more effectively and have higher water retention compared to nonwoven fabrics that incorporate hydrophobic fibers instead of waterproof cellulose fibers. Moreover, because waterproof cellulose fibers are biodegradable, the aforementioned nonwoven fabric and the wet wipes formed from it are readily biodegradable, thus reducing environmental impact.

[0075] Cellulose fibers that constitute the above-mentioned waterproof cellulose fibers can include natural cellulose fibers, regenerated cellulose fibers, refined cellulose fibers, and semi-synthetic cellulose fibers.

[0076] Examples of natural cellulose fibers include plant fibers such as pulp fibers, seed fibers (e.g., cotton fibers), bast fibers (e.g., hemp), leaf vein fibers (e.g., Manila hemp), and fruit fibers (e.g., coconut).

[0077] The pulp fibers mentioned above include pulp fibers known in this art, such as wood pulp fibers and non-wood pulp fibers. Examples of wood pulp fibers include coniferous pulp fibers and broadleaf pulp fibers. Examples of non-wood pulp fibers include rice straw pulp fibers, bagasse pulp fibers, reed pulp fibers, kenaf pulp fibers, mulberry pulp fibers, bamboo pulp fibers, hemp pulp fibers, and cotton pulp fibers (e.g., cotton linter fibers).

[0078] Examples of cotton fibers mentioned above include upland cotton (e.g., upland cotton), barbadense cotton, arboreum cotton, and herbaceum cotton.

[0079] In addition, the aforementioned cotton fibers can be organic cotton fibers or pre-organic cotton (trademark) fibers.

[0080] Organic cotton fiber refers to cotton that has been certified by GOTS (Global Organic Textile Standard).

[0081] Examples of the aforementioned regenerated cellulose fibers include rayon, such as viscose rayon obtained from viscose, polynosic and modal fibers, and cuprammonium rayon (also known as "cuprammonium fiber") obtained from a cuprammonium salt solution of cellulose.

[0082] Lyocell fiber is an example of the refined cellulose fiber mentioned above. Specifically, it is made by dissolving pulp in an aqueous solution of N-methylmorpholine N-oxide to form a spinning dope, which is then extruded into a dilute solution of N-methylmorpholine N-oxide to produce fiber. This refined cellulose fiber is, for example, sold on the market as Tencel (trademark).

[0083] Examples of semi-synthetic fibers mentioned above include semi-synthetic cellulose, such as cellulose acetate, cellulose triacetate, and cellulose diacetate.

[0084] The aforementioned waterproof cellulose fibers can be formed, for example, by waterproofing the cellulose fibers using a waterproofing agent or the like, according to the methods described in Japanese Patent Application Publication Nos. 2002-266241, 2003-20570, 2019-65443, and 2022-58301.

[0085] In addition, as examples of the aforementioned waterproof cellulose fibers, there are Eco Repellas (a waterproof viscose rayon) manufactured by Daiwabo Rayon Co., Ltd., and Olea (a waterproof viscose rayon) manufactured by Kelheim Fibres GmbH, which are sold on the market.

[0086] The waterproof properties of the above-mentioned waterproof cellulose fibers can be evaluated according to the “6 (1) kcal settling velocity” in the appendix to the “Standards for Medical Gauze and Medical Degreased Cotton” of the State Food and Drug Administration’s document No. 0630001, “Standards for Medical Gauze and Medical Degreased Cotton”.

[0087] A 10g sample, obtained by opening the fibers constituting the nonwoven fabric or fibers extracted from wet wipes using a carding machine, is evenly placed into a test cage made of 0.4mm diameter copper wire, 50mm in diameter, 80mm deep, with a wire spacing of 20mm and a weight of 3g. The cage is placed horizontally and slowly lowered into water at a depth of 200mm from a height of 12mm above the water surface at a water temperature of 24-26℃. The time until the cage sinks below the water surface is defined as the settling velocity. Alternatively, for fibers that cannot be opened using a carding machine (e.g., short fibers), 10g of fiber can be placed directly into the test cage. Or, if the fiber product is in the form of wet nonwoven fabric or air-laid nonwoven fabric, 10g of nonwoven fabric cut into 1cm x 1cm pieces can be placed into the test cage.

[0088] Preferably, the following fibers are used as waterproof cellulose fibers: in the above method, when the settling velocity is measured, for example after 1 minute, 5 minutes, or 10 minutes, the fiber sample absorbs water but does not sink below the water surface. More preferably, the following fibers are used as waterproof cellulose fibers: after 1 minute, the fiber sample does not sink but floats partially or entirely on the water surface.

[0089] In addition, the above-mentioned waterproof cellulose fibers can be distinguished based on their water swelling properties and their hydrophilic cellulose fiber properties.

[0090] The aforementioned waterproof cellulose fibers preferably have a water swelling capacity of 10% or more by mass, more preferably 15% or more by mass, and even more preferably 20% or more by mass. Furthermore, the aforementioned waterproof cellulose fibers preferably have a water swelling capacity of 80% or less by mass, more preferably 70% or less by mass, and even more preferably 60% or less by mass. Therefore, in the wet wipes formed from the aforementioned nonwoven fabric, the wet wipe portions are difficult to adhere to each other and can be easily separated.

[0091] Furthermore, the aforementioned hydrophilic cellulose fibers can have a higher water swelling capacity than the aforementioned waterproof cellulose fibers. The aforementioned hydrophilic cellulose fibers preferably have a water swelling capacity of more than 60% by mass, more preferably more than 70% by mass, even more preferably more than 80% by mass, even more preferably more than 85% by mass, and even more preferably more than 90% by mass. Additionally, the aforementioned hydrophilic cellulose fibers preferably have a water swelling capacity of 300% by mass or less, more preferably 200% by mass or less, and even more preferably 150% by mass or less.

[0092] Compared to ordinary cellulose fibers that are not waterproof, such as hydrophilic cellulose fibers described later, the aforementioned waterproof cellulose fibers preferably have a water swelling rate that is 5% or more lower by mass, more preferably 10% or more lower by mass, further preferably 15% or more lower by mass, even more preferably 20% or more lower by mass, and even more preferably 25% or more lower by mass. Therefore, in wet wipes formed from the aforementioned nonwoven fabric, the wipe portions are less likely to adhere to each other and are easily separated.

[0093] In this disclosure, the water swelling property of the fiber is determined according to "8.26 Water swelling property" of JIS L1015:2010 "Test method for short chemical fibers", and can also be applied to fibers other than rayon and cuprammonium fiber.

[0094] The aforementioned waterproof cellulose fibers preferably have an average fiber length of 20 mm or more, more preferably 30 mm or more, and even more preferably 35 mm or more. Furthermore, the aforementioned waterproof cellulose fibers preferably have an average fiber length of 80 mm or less, more preferably 60 mm or less, and even more preferably 50 mm or less. Therefore, the aforementioned waterproof cellulose fibers can easily interweave with other fibers, such as waterproof cellulose fibers and desired hydrophilic cellulose fibers, easily increasing the strength of the nonwoven fabric and wet wipes.

[0095] The aforementioned waterproof cellulose fibers preferably have a fineness of 0.6 dtex or more, more preferably 1.0 dtex or more, and even more preferably 1.4 dtex or more. Furthermore, the aforementioned waterproof cellulose fibers preferably have a fineness of 3.3 dtex or less, more preferably 2.5 dtex or less, and even more preferably 2.0 dtex or less. This allows for the suppression of fiber clumps in the nonwoven fabric containing the waterproof cellulose fibers and maintains a pleasant tactile feel.

[0096] Furthermore, in this disclosure, the average fiber length of fibers other than pulp fibers is determined according to Appendix A of JIS L 1015:2010, “A7.1 Determination of Fiber Length”, “A7.1.1 Method A (Standard Method) for Determining the Length of Individual Fibers on a Graduated Glass Plate”.

[0097] Furthermore, the above method is equivalent to the test method of ISO 6989, issued in 1981.

[0098] In this disclosure, the average fiber length of pulp fibers refers to the weight-weighted average fiber length and the L(w) value measured using a Kajaani FiberLab fiber properties (off-line) instrument manufactured by Metso Automation.

[0099] The aforementioned nonwoven fabric preferably contains the aforementioned waterproof cellulose fibers at a rate of more than 0% by mass, more preferably at a rate of 4% or more by mass, even more preferably at a rate of 6% or more by mass, even more preferably at a rate of 8% or more by mass, and even more preferably at a rate of 10% or more by mass. Furthermore, the aforementioned nonwoven fabric preferably contains the aforementioned waterproof cellulose fibers at a rate of 100% or less by mass, more preferably at a rate of 70% or less by mass, even more preferably at a rate of 60% or less by mass, even more preferably at a rate of 50% or less by mass, and even more preferably at a rate of 35% or less by mass. Therefore, the aforementioned nonwoven fabric has a certain affinity for water, and in a wet wipe formed from the aforementioned nonwoven fabric, the wet wipe portions are difficult to adhere to each other and are easily separated.

[0100] Alternatively, the aforementioned nonwoven fabric may also contain hydrophilic cellulose fibers. Therefore, the nonwoven fabric itself easily retains the medication, and the wipes are difficult to adhere to each other and can be easily separated. Furthermore, since the wipes formed from this nonwoven fabric easily retain the medication, their water retention is improved. Moreover, because hydrophilic cellulose fibers are biodegradable, the aforementioned nonwoven fabric and the wipes formed from it are easily biodegradable, reducing environmental impact.

[0101] Based on the above viewpoints, the aforementioned nonwoven fabric preferably contains the aforementioned hydrophilic cellulose fibers at a rate of 5% or more by mass, more preferably at a rate of 10% or more by mass, even more preferably at a rate of 15% or more by mass, even more preferably at a rate of 20% or more by mass, and even more preferably at a rate of 25% or more by mass. Furthermore, the aforementioned nonwoven fabric preferably contains the aforementioned hydrophilic cellulose fibers at a rate of 90% or less by mass, more preferably at a rate of 80% or less by mass, even more preferably at a rate of 70% or less by mass, even more preferably at a rate of 60% or less by mass, and even more preferably at a rate of 50% or less by mass.

[0102] Cellulose fibers that constitute the above-mentioned hydrophilic cellulose fibers can be listed in the section on waterproof cellulose fibers.

[0103] When the aforementioned hydrophilic cellulose fibers are not pulp fibers, they preferably have an average fiber length of 20 mm or more, more preferably 30 mm or more, and even more preferably 35 mm or more. Furthermore, when the aforementioned hydrophilic cellulose fibers are not pulp fibers, they preferably have an average fiber length of 80 mm or less, more preferably 70 mm or less, and even more preferably 60 mm or less. This allows the hydrophilic cellulose fibers to easily interweave, resulting in higher strength in the nonwoven fabric and wet wipes.

[0104] The aforementioned hydrophilic cellulose fibers preferably have a fineness of 0.3 dtex or more, more preferably 0.4 dtex or more, and even more preferably 0.6 dtex or more. Furthermore, the aforementioned hydrophilic cellulose fibers preferably have a fineness of 4.5 dtex or less, more preferably 4.0 dtex or less, and even more preferably 3.0 dtex or less. This allows for the suppression of fiber clumps in the nonwoven fabric containing the hydrophilic cellulose fibers and maintains a pleasant tactile feel.

[0105] The aforementioned nonwoven fabric can be composed of the aforementioned waterproof cellulose fibers and the aforementioned hydrophilic cellulose fibers.

[0106] In addition to the aforementioned waterproof cellulose fibers and hydrophilic cellulose fibers, the nonwoven fabrics described above may also include heat-fused fibers, hydrophobic fibers, etc., as described later.

[0107] Alternatively, the aforementioned nonwoven fabric may also include heat-fusion bonding fibers that are desired to be heat-fused together in the nonwoven fabric. The aforementioned nonwoven fabric includes heat-fusion bonding fibers, and the strength of the nonwoven fabric and the wet strength of the wet wipes can be improved through heat-fusion bonding between heat-fusion bonding fibers, heat-fusion bonding between heat-fusion bonding fibers and cellulose-based fibers (waterproof cellulose-based fibers and hydrophilic cellulose-based fibers), etc. Furthermore, when the aforementioned heat-fusion bonding fibers are heat-fused together, the strength of the nonwoven fabric and the wet strength of the wet wipes can be further improved.

[0108] As the aforementioned heat-fusion bonding fiber, heat-fusion bonding fibers used in this technical field can be employed without limitation. Specifically, fibers comprising both low-melting-point thermoplastic resins and high-melting-point thermoplastic resins can be employed without limitation. For the heat-fusion bonding fibers to fuse together, heat-fusion bonding fibers comprising at least a low-melting-point thermoplastic resin such as polyethylene resin or low-melting-point polypropylene on their surface are preferred. Examples of such heat-fusion bonding fibers include: single-component fibers of polyethylene resin; single-component fibers of polypropylene resin; core-sheath type composite synthetic fibers with a core of polyethylene terephthalate resin and a sheath of polyethylene resin; core-sheath type composite synthetic fibers with a core of polypropylene resin and a sheath of polyethylene resin; core-sheath type composite synthetic fibers with a core of high-melting-point polypropylene resin and a sheath of low-melting-point polypropylene resin; parallel-type composite synthetic fibers composed of polyethylene terephthalate resin and polyethylene resin; and parallel-type composite synthetic fibers composed of polypropylene resin and polyethylene resin.

[0109] The aforementioned heat-fused fibers are preferably biodegradable heat-fused fibers. Therefore, the aforementioned nonwoven fabric and wet wipes readily become biodegradable.

[0110] Examples of low-melting-point thermoplastic resins constituting the biodegradable heat-melting fibers include polybutylene succinate, poly(hydroxybutyrate / hydroxyhexanoate), polycaprolactone, poly(caprolactone / butylene succinate), poly(butylene succinate / adipate), poly(butylene succinate / carbonate), poly(butylene adipate / terephthalate), polyethylene succinate, or polylactic acid.

[0111] Examples of high-melting-point thermoplastic resins that constitute the aforementioned biodegradable heat-melting fibers include polylactic acid, polyhydroxybutyrate, polyglycolic acid, or cellulose acetate.

[0112] When the aforementioned nonwoven fabric contains the aforementioned heat-fusion fibers, the nonwoven fabric preferably contains the aforementioned heat-fusion fibers at a ratio of more than 0% by mass, more preferably 2% by mass or more, and even more preferably 5% by mass or more. Furthermore, when the aforementioned nonwoven fabric contains the aforementioned heat-fusion fibers, the nonwoven fabric preferably contains the aforementioned heat-fusion fibers at a ratio of 30% by mass or less, more preferably 20% by mass or less, and even more preferably 15% by mass or less. As a result, the wet wipes formed from the aforementioned nonwoven fabric exhibit excellent wettability.

[0113] Alternatively, the aforementioned nonwoven fabric may also contain hydrophobic fibers that are not desired to be heat-bonded within the nonwoven fabric. Therefore, the wet wipes formed from the aforementioned nonwoven fabric can possess properties such as fluffiness and resistance to collapse.

[0114] Examples of hydrophobic fibers include those commonly used in this art, with synthetic fibers being preferred. Examples of synthetic fibers include those comprising a single component, such as single fibers, or those comprising multiple components, such as composite fibers.

[0115] Examples of the above components include, for example, polyolefin polymers such as polyethylene and polypropylene; polyester polymers such as terephthalate polymers such as polyethylene terephthalate (PET), polybutylene terephthalate, and polypentyl terephthalate; polyamide polymers such as nylon 6 and nylon 66; acrylic polymers; polyacrylonitrile polymers; and modified versions thereof.

[0116] When the aforementioned nonwoven fabric contains the aforementioned hydrophobic fibers, the nonwoven fabric preferably contains the aforementioned hydrophobic fibers at a ratio of more than 0% by mass, more preferably 1% by mass or more, and even more preferably 2% by mass or more. Furthermore, when the aforementioned nonwoven fabric contains the aforementioned hydrophobic fibers, the nonwoven fabric preferably contains the aforementioned hydrophobic fibers at a ratio of 50% by mass or less, more preferably 40% by mass or less, and even more preferably 35% by mass or less. Therefore, the wet wipes formed from the aforementioned nonwoven fabric can possess fluffiness and resistance to collapse.

[0117] The above-mentioned nonwoven fabric preferably has a content of 20 g / m 2 More preferably, it has 30g / m 2 The above, and further preferred, has 35g / m 2 The above refers to the weight per unit area. Furthermore, the aforementioned nonwoven fabric preferably has a weight of 100 g / m². 2 The following, more preferably, have 90g / m 2 The following is a further preferred option with 80g / m 2 The following, and more preferably, has a concentration of 70 g / m 2The following is the weight per unit area. Therefore, it is easy to ensure the removability and strength of the wet wipes formed from the above-mentioned nonwoven fabric during wiping.

[0118] The aforementioned nonwoven fabric can have a layered structure, such as a two-layer structure, a three-layer structure, a four-layer structure, a five-layer structure, etc. (Hereinafter, structures with more than three layers are sometimes referred to as "structures with more than three layers").

[0119] When the nonwoven fabric has a structure of three or more layers, the nonwoven fabric can be divided into a first surface layer and a second surface layer constituting the surface of the nonwoven fabric, and one or more intermediate layers disposed between the first surface layer and the second surface layer.

[0120] When the nonwoven fabric has a structure of three or more layers, it is preferable that at least one of the first surface layer and the second surface layer contains waterproof cellulose fibers, and more preferably that both the first surface layer and the second surface layer contain waterproof cellulose fibers. Therefore, in the wet wipe formed from the nonwoven fabric, the wet wipe portions are difficult to adhere to each other and can be easily separated.

[0121] Furthermore, the intermediate layer may contain the aforementioned waterproof cellulose fibers, but from the viewpoint of easily separating adjacent wet wipe portions from each other, the intermediate layer may not contain the aforementioned waterproof cellulose fibers.

[0122] When the nonwoven fabric has a structure of three or more layers, and when the nonwoven fabric further contains hydrophilic cellulose fibers, the hydrophilic cellulose fibers can be included in any layer of the first surface layer, the intermediate layer, and the second surface layer, preferably in all layers of the first surface layer, the intermediate layer, and the second surface layer. This allows the medicinal solution to easily and fully penetrate the wet wipe formed from the nonwoven fabric.

[0123] When the nonwoven fabric has a structure of three or more layers, and when the nonwoven fabric further includes heat-fused fibers, the heat-fused fibers can be included in any one of the first surface layer, the intermediate layer, and the second surface layer. The heat-fused fibers can be included in at least the intermediate layer, or only in the intermediate layer. Therefore, the wet wipe formed from the nonwoven fabric has excellent wettability, and the user hardly feels the stiffness from the heat-fused fibers.

[0124] Furthermore, the aforementioned heat-fused fibers can also be included in the first and second surface layers. Therefore, the wet wipes formed from the aforementioned nonwoven fabric are less prone to deformation such as distortion or stretching during wiping.

[0125] When the nonwoven fabric has a structure of three or more layers, it is preferable that the first surface layer and the second surface layer are each composed of cellulose fibers. This allows the medication to be easily retained in the first and second surface layers, resulting in excellent wiping properties of the wet wipe.

[0126] Furthermore, the aforementioned cellulose fibers include the aforementioned waterproof cellulose fibers and the desired aforementioned hydrophilic cellulose fibers.

[0127] When the nonwoven fabric has a structure of three or more layers, the intermediate layer may also contain pulp fibers. As a result, the amount of medicine on the surface of the wet wipe portion (the first surface layer and the second surface layer) is relatively reduced, and the wet wipe portions are difficult to adhere to each other and are easy to separate.

[0128] The nonwoven fabric disclosed herein preferably has an absorbency of 60 mm or more, more preferably 65 mm or more, and even more preferably 70 mm or more based on the Klem method. Furthermore, the nonwoven fabric of this disclosure preferably has an absorbency of 110 mm or less, more preferably 105 mm or less, and even more preferably 100 mm or less based on the Klem method. Therefore, in the wet wipes formed from the above-described nonwoven fabric, the wet wipe portions are difficult to adhere to each other and can be easily separated.

[0129] In this disclosure, the water absorption based on the Klem method is determined according to JIS P8141:2004 "Paper and paperboard - Test method for water absorption - Klem method", the differences from JIS P8141:2004 are as follows.

[0130] - The test pieces are divided into two types: test pieces with the long side direction of the conveying direction when manufacturing nonwoven fabric (hereinafter referred to as "MD test pieces") and test pieces with the short side direction of the conveying direction when manufacturing nonwoven fabric (hereinafter referred to as "CD test pieces").

[0131] - Change the size of the test piece from "width 15±1mm" to "width 25±1mm".

[0132] - The height of the water rise has been changed from "10 minutes ± 10 seconds" to "5 minutes ± 10 seconds".

[0133] - The average value of the Klem absorbance of the MD test piece and the Klem absorbance of the CD test piece is used as the Klem absorbance.

[0134] The nonwoven fabric disclosed herein preferably has an absorbency of 13.5 g / g or more, more preferably 14.0 g / g or more, even more preferably 14.5 g / g or more, and even more preferably 15.0 g / g or more. Furthermore, the nonwoven fabric disclosed herein preferably has an absorbency of 20.0 g / g or less, more preferably 19.0 g / g or less, even more preferably 18.0 g / g or less, and even more preferably 17.0 g / g or less. Therefore, the wet wipes formed from the above-described nonwoven fabric exhibit excellent wiping properties.

[0135] The nonwoven fabric disclosed herein preferably has a water retention of 10.0 g / g or more, more preferably 10.3 g / g or more, even more preferably 10.6 g / g or more, and even more preferably 10.9 g / g or more. Furthermore, the nonwoven fabric of this disclosure preferably has a water retention of 16.0 g / g or less, more preferably 15.0 g / g or less, even more preferably 14.0 g / g or less, and even more preferably 13.0 g / g or less. Therefore, the wet wipes formed from the above-mentioned nonwoven fabric exhibit excellent wiping properties.

[0136] In this disclosure, water absorption and water retention are measured as follows.

[0137] (1) Cut the nonwoven fabric into 60mm×140mm (the orthogonal direction of the conveying direction during manufacturing) to prepare the sample and measure the mass of the sample: m0 (g).

[0138] (2) Add ion-exchange water to a plastic container, place the sample on a mesh metal grid on which the mass m1 (g) was measured, and immerse the sample and the metal grid together in the ion-exchange water.

[0139] (3) After soaking for 3 minutes, remove the sample along with the metal mesh from the ion-exchange water, let it stand for 5 minutes and drain.

[0140] (4) After standing for 5 minutes, the total mass of the sample and the metal mesh, m2 (g), was determined.

[0141] (5) Hold the sample containing ion-exchanged water with tweezers without applying pressure and place the sample without wrinkles on a metal stand with a size of 60mm × 140mm or larger.

[0142] (6) Place an 840g weight on the sample in a manner that makes the load evenly applied to the entire sample and let it stand for 3 minutes.

[0143] (7) After standing for 3 minutes, measure the mass of the sample: m3 (g).

[0144] (8) Water absorption: A (g / g) is calculated using the following formula:

[0145] A(g / g)=(m2-m1-m0) / m0.

[0146] (9) Water retention capacity: R (g / g) is calculated using the following formula:

[0147] R(g / g) = (m3-m0) / m0.

[0148] In addition, the water absorption and water retention were measured in a constant temperature room at 25℃±5℃.

[0149] The aforementioned nonwoven fabric can be any nonwoven fabric (e.g., spunlace nonwoven fabric, hot air nonwoven fabric, spunbond nonwoven fabric, dot-bonded nonwoven fabric, etc.) manufactured by known methods such as dry method, wet method, water jet method, spunbond method, air-laid method, needle punching method, felting method, etc., and is preferably a spunlace nonwoven fabric with high wet strength.

[0150] The aforementioned nonwoven fabric can be manufactured using methods known in the art. When the nonwoven fabric is a spunlace nonwoven fabric, such as a dry spunlace nonwoven fabric, it can be manufactured, for example, by a dry spunlace process, in which a single or multiple layers of fabric constituting the nonwoven fabric, formed by dry spunlace, are arranged on a support, and high-pressure water jets are sprayed onto the fabric from a nozzle.

[0151] In addition, when the nonwoven fabric contains heat-fusion fibers, the fabric (nonwoven fabric) can be heated to above the melting point of the low-melting-point thermoplastic resin constituting the heat-fusion fibers after high-pressure water jet is sprayed onto the fabric, and the heat-fusion fibers can be heat-fused together.

[0152] [Wet wipes and their packaging]

[0153] The wet wipes disclosed herein comprise a medicinal liquid and a nonwoven fabric sheet made of the aforementioned nonwoven fabric.

[0154] The nonwoven fabric is cut into the desired size to form the nonwoven fabric sheet.

[0155] The aforementioned liquid can be used without restriction as a liquid in this technical field.

[0156] The aforementioned liquid solution may contain, for example, antibacterial agents, surfactants, water, hydrophilic organic solvents (such as ethanol), etc.

[0157] In the aforementioned wet wipes, the ratio (permeability) of the medicinal solution that permeates the nonwoven fabric can be a ratio commonly used in the art. The permeability (mass%) [=100×(mass of medicinal solution) / (mass of nonwoven fabric)] can be, for example, 100% by mass or more, more preferably 200% by mass or more, and even more preferably 250% by mass or more. Furthermore, the ratio (permeability) of the medicinal solution can be, for example, preferably 700% by mass or less, more preferably 600% by mass or less, even more preferably 550% by mass or less, and even more preferably 500% by mass or less.

[0158] The packaging of wet wipes includes the aforementioned wet wipes and a main packaging body, with the wet wipes housed within the main packaging body. Examples of such main packaging bodies include packaging sheets and packaging containers.

[0159] When the main packaging element is a sheet, one or more wet wipes are stored within the sheet. If the packaging contains only one wet wipe, that wet wipe is folded. Alternatively, if the packaging contains multiple wet wipes, the wipes may or may not be folded.

[0160] In addition, when the main packaging body is a packaging container, multiple wet wipes are stored in the packaging container within the wet wipe packaging body.

[0161] The aforementioned packaging container may have a bottom and a top with an opening, and the aforementioned plurality of wet wipes may be stacked in the direction from the bottom to the top.

[0162] In addition, the above-mentioned multiple wet wipes can be configured such that a portion of the bottom-side wet wipe located on the bottom side and a portion of the top-side wet wipe adjacent to the top side of the bottom-side wet wipe overlap each other in such a way that a portion of the bottom-side wet wipe is located on the top side of the top side of the top-side wet wipe.

[0163] Figure 1 This is a perspective view of the packaging body 1 of wet wipes according to one embodiment of the present disclosure (hereinafter referred to as "first embodiment"). Figure 2 It is the packaging body 1 of the wet wipes. Figure 1 The end face view at end face II-II shown.

[0164] Figure 1 The packaging body 1 shown is a pop-up type packaging body for wet wipes. Multiple wet wipes (not shown) are stored inside the packaging body 3 in a manner that allows them to be removed sequentially. The packaging body 3 has a bottom B and a top T with an opening 5.

[0165] The main body of the packaging 3 has a seal 7 that covers the opening 5.

[0166] The main packaging 3 is bag-shaped. When the opening 5 is sealed by the sealing element 7, the wet wipes inside the main packaging 3 can be sealed and the evaporation of the medicine can be inhibited. Each wet wipe can be taken out through the opening 5. In order to repeatedly seal the wet wipes inside the main packaging 3, the sealing element 7 is coated with adhesive on the surface that contacts the main packaging 3.

[0167] like Figure 2 As shown, inside the main packaging body 3, multiple wet wipes 9 are stacked in a direction from top T to bottom B. Furthermore, each of the multiple wet wipes 9 has an outward three-fold (approximately Z-shaped) fold structure, which has a first fold line and a second fold line. Additionally, the multiple wet wipes 9 are stacked such that adjacent wet wipes 9 in the thickness direction (from top T to bottom B) face the same direction (the first fold line overlaps with each other in the aforementioned thickness direction, and the second fold line overlaps with each other in the aforementioned thickness direction).

[0168] Figure 3 It is used to explain storage in Figure 2 A diagram showing multiple wet wipes 9 in the package 1 of the wet wipes shown.

[0169] Wet wipes 9', 9'', and 9''' are stacked sequentially in the direction from top T to bottom B. In the relationship between wet wipes 9' and 9'', the top end 9''T of the wet wipe 9'' (bottom-side wet wipe) located on the bottom B side and the bottom end 9'B of the wet wipe 9' (top-side wet wipe) adjacent to the top T side of the bottom-side wet wipe overlap each other in such a way that the top end 9''T of the wet wipe 9'' (bottom-side wet wipe) is positioned closer to the top T side than the bottom end 9'B of the wet wipe 9' (top-side wet wipe).

[0170] Similarly, in Figure 3 In the relationship between wet wipe 9'' and wet wipe 9''', the top end 9'''T of the wet wipe 9''' (bottom side wet wipe) located on the bottom B side and the bottom end 9''B of the wet wipe 9'' (top side wet wipe) adjacent to the top T side of the bottom side wet wipe overlap each other in such a way that the top end 9'''T of the wet wipe 9''' (bottom side wet wipe) is located closer to the top T side than the bottom end 9''B of the wet wipe 9'' (top side wet wipe).

[0171] By using multiple wet wipes 9 Figure 2 and Figure 3 The wipes are stacked as shown, so that when the wipes 9' are taken out, a portion of the wipes 9'' (mainly 9''T) is pulled out and protrudes from the main body of the packaging 3, making it easy to remove the wipes 9'' for the next use.

[0172] Furthermore, if the bottom end 9'B of the wet wipe 9' is connected to the top end 9''T of the wet wipe 9'' by using the water film of the medicine formed between the wet wipes, then when taking out the wet wipe 9', there is sometimes a tendency to take out multiple wet wipes 9'' together as a whole.

[0173] In the packaging 1 of the wet wipes in the first embodiment, since the wet wipes 9 are specific wet wipes, the single-sheet removal capability is excellent.

[0174] Figure 4 This is an end view of the packaging body 1 of the wet wipes according to another embodiment of this disclosure (hereinafter referred to as the "second embodiment"), which is equivalent to Figure 1 End face view of end face II-II. Figure 4 In this structure, multiple wet wipes 9 each have a four-fold (approximately Σ-shaped) fold structure formed by folding three fold lines. In addition, multiple wet wipes 9 are stacked in such a way that the Σ-shaped structures of adjacent wet wipes 9 in the thickness direction (from the top T to the bottom B) face opposite directions.

[0175] In the packaging body 1 of the wet wipes in the second embodiment, similarly to the first embodiment, the top end (not shown) of the bottom-side wet wipe (not shown) located on the bottom side and the bottom end (not shown) of the top-side wet wipe (not shown) adjacent to the top side of the bottom-side wet wipe overlap each other in such a way that the top end of the bottom-side wet wipe is located on the top side of the top side of the top-side wet wipe.

[0176] In the packaging 1 of the wet wipes in the second embodiment, since the wet wipes 9 are specific wet wipes, the single-sheet removal capability is excellent.

[0177] Example

[0178] The following examples illustrate this disclosure, but this disclosure is not limited to these examples.

[0179] [Manufacturing Example 1]

[0180] Nonwoven fabric No.1, consisting of a first surface layer, a first intermediate layer, a second intermediate layer, and a second surface layer, was formed by dry hydroentangling.

[0181] In addition, the first surface layer and the second surface layer respectively contain 30% by mass of waterproof rayon fiber (manufactured by Daiwabo Rayon Co., Ltd., Eco Repellas, fineness: 1.7 dtex, average fiber length: 40 mm) and 70% by mass of hydrophilic rayon fiber (manufactured by Daiwabo Rayon Co., Ltd., Corona, fineness: 1.44 dtex, average fiber length: 44 mm).

[0182] The first intermediate layer comprises 85% by mass pulp fiber (coniferous pulp fiber) and 15% by mass heat-fused fiber (manufactured by Daiwabo Textile Co., Ltd., NBF(KK)-PL, a composite fiber with polylactic acid core and polybutylene succinate sheath, fineness: 2.40 dtex, average fiber length: 5.0 mm). The second intermediate layer comprises 100% by mass hydrophilic rayon fiber (manufactured by Daiwabo Rayon Co., Ltd., Corona, fineness: 1.44 dtex, average fiber length: 44 mm).

[0183] Nonwoven fabric No.1 is cut into 200×140mm (take-out direction×width direction) dimensions. As shown in the second embodiment, 50 sheets of the cut nonwoven fabric No.1 are stacked together, and the 50 stacked sheets are packaged using a packaging body. Next, the packaging body is filled with 300% by mass of the medicine solution of the 50 stacked sheets, thereby forming the wet wipe packaging body No.1.

[0184] [Manufacturing Example 2]

[0185] Except for changing the composition of the first surface layer and the second surface layer as shown in Table 1, the nonwoven fabric No. 2 and the wet wipe packaging body No. 2 were formed in the same manner as in Manufacturing Example 1.

[0186] [Manufacturing Example 3]

[0187] Except for changing the composition of the first surface layer and the second surface layer as shown in Table 1, the nonwoven fabric No. 3 and the wet wipe packaging body No. 3 were formed in the same manner as in Manufacturing Example 1.

[0188] [Refer to manufacturing example 1]

[0189] Except for changing the composition of the first surface layer and the second surface layer as shown in Table 1, the nonwoven fabric No. 4 and the wet wipe packaging No. 4 were formed in the same manner as in Manufacturing Example 1.

[0190] [Comparative Manufacturing Example 1]

[0191] Except for changing the composition of the first surface layer and the second surface layer as shown in Table 2, specifically, except for changing the "waterproof rayon fiber" in the first surface layer and the second surface layer to "hydrophobic fiber (polyethylene terephthalate fiber, fineness: 1.45 dtex, average fiber length: 38 mm)," nonwoven fabric No. 5 and wet wipe packaging No. 5 were formed in the same manner as in manufacturing example 1.

[0192] [Table 1]

[0193]

[0194] [Table 2]

[0195]

[0196] [Examples 1-3, and Comparative Examples 1 and 2]

[0197] [Water absorption based on the Klem method]

[0198] For nonwoven fabrics No. 1 to No. 5, the absorbency, water absorption, and water retention based on the Klem method were measured according to the method described in this instruction manual. The results are shown in Table 3.

[0199] In each of the wet wipe packages No. 1 to No. 5, the removability and removal height of multiple wipes were evaluated. The test methods are described below. Furthermore, the results are shown in Table 3.

[0200] [Multiple image extraction]

[0201] Take out the wet wipes one by one from the package. When taking out the nth wet wipe (numbered 1, 2, ..., n, ..., 50 from top to bottom), count the number of wet wipes that are pulled out as a whole by the nth wet wipe (the wet wipe taken out directly) (wet wipes taken out "indirectly" as a whole).

[0202] For example, when the nth wet wipe is taken out, if the (n+1)th wet wipe below it is pulled out together with the nth wet wipe, the wet wipe that is indirectly taken out "as a whole" is counted as one.

[0203] Additionally, when the nth wet wipe is taken out, if the (n+1)th wet wipe located below it is pulled out together with the nth wet wipe and the (n+2)th wet wipe located between the two below it is pulled out together with the (n+1)th wet wipe, the number of wet wipes taken out "as a whole" indirectly is counted as two.

[0204] The experiment continued until all 50 wipes were removed. The total number of wipes removed indirectly "as a whole" was counted, and this was taken as the number of wipes removed (wipes).

[0205] [Retrieve Height]

[0206] Take out the wet wipes one by one from the package. When taking out the nth wet wipe (numbered 1, 2, ..., n, ..., 50 from top to bottom), measure the length (from the edge of the wet wipe to the opening) of the wet wipe that was pulled out by the nth wet wipe (the wet wipe taken out directly) and a portion of it was taken out together (the wet wipe that was taken out "indirectly"). Take the average value of the whole as the taking out height.

[0207] Furthermore, in the determination of the height removed, wet wipes that were removed indirectly "as a whole" were ignored.

[0208] [Table 3]

[0209]

[0210] Explanation of reference numerals in the attached figures

[0211] 1. Packaging of wet wipes

[0212] 3. Main packaging

[0213] 5. Opening

[0214] 7. Seals

[0215] 9. Wet wipes.

Claims

1. A nonwoven fabric, wherein the nonwoven fabric is a nonwoven fabric for wet wipes, characterized in that, The nonwoven fabric contains waterproof cellulose fibers.

2. The nonwoven fabric according to claim 1, characterized in that, The nonwoven fabric has a water absorption rate of 60-110 mm based on the Klem method.

3. The nonwoven fabric according to claim 1 or 2, characterized in that, The nonwoven fabric contains 10-35% by mass of the waterproof cellulose fibers.

4. The nonwoven fabric according to any one of claims 1 to 3, characterized in that, The waterproof cellulose fiber has a water swelling capacity of 10-80% by mass.

5. The nonwoven fabric according to any one of claims 1 to 4, characterized in that, The nonwoven fabric includes a first surface layer and a second surface layer constituting the surface of the nonwoven fabric, and an intermediate layer disposed between the first surface layer and the second surface layer. The first surface layer and the second surface layer each contain the aforementioned waterproof cellulose fibers. The intermediate layer contains heat-fused fibers.

6. The nonwoven fabric according to claim 5, characterized in that, The heat-fusion bondable fiber comprises a biodegradable heat-fusion bondable fiber.

7. The nonwoven fabric according to claim 5 or 6, characterized in that, The first and second surface layers are each composed of cellulose fibers.

8. The nonwoven fabric according to any one of claims 5 to 7, characterized in that, The intermediate layer also contains pulp fibers.

9. A wet wipe, characterized in that, The wet wipe comprises a non-woven fabric sheet and a medicinal liquid, wherein the non-woven fabric sheet is composed of the non-woven fabric according to any one of claims 1 to 8.

10. A packaging body for wet wipes, wherein a plurality of wet wipes are stored inside a packaging body having a bottom and an opening at the top, characterized in that, At least a portion of the plurality of wet wipes is composed of the wet wipes described in claim 9. The plurality of wet wipes are stacked in a direction from the bottom to the top.

11. The packaging body of the wet wipes according to claim 10, characterized in that, The plurality of wet wipes are configured such that the top end of the bottom-side wet wipe located on the bottom side and the bottom end of the top-side wet wipe adjacent to the top side of the bottom-side wet wipe overlap each other in such a way that the top end of the bottom-side wet wipe is positioned closer to the top side than the bottom end of the top-side wet wipe.

12. The use of a waterproof cellulose fiber for adjusting the removability of wet wipes.

Images