Laminated fiber sheet and method for using same

Abstract

This method for using a laminated fiber sheet is a method for wetting a laminated fiber sheet having an inner sheet laminated on one surface of an outer sheet, the laminated fiber sheet, the inner sheet and the outer sheet being insoluble in liquid, the median fiber diameter of the inner sheet being 0.3-5 [mu] m, and the median fiber diameter of the outer sheet being 0.3-5 [mu] m, the median fiber diameter of the inner sheet being 0.3-5 [mu] m, and the median fiber diameter of the outer sheet being 0.3-5 [mu] m. The present invention relates to a method for using a laminated fiber sheet in which a median fiber diameter of an outer sheet is larger than a median fiber diameter of an inner sheet, the inner sheet being integrated with the outer sheet, the method comprising: a step for applying the laminated fiber sheet such that the inner sheet faces an object; and a step for applying the liquid.

Description

Technical Field

[0001] The present invention relates to laminated fiber sheets and methods of using the same. Background Art

[0002] Among sheets composed of fibers (hereinafter referred to as "fiber sheets"), structures composed of deposited ultrafine fibers (e.g., with a fiber diameter of 5 μm or less) have recently attracted attention. Electrospinning (electrospinning) is one example of a spinning technique used to produce uniform fiber sheets composed of fine fibers. Fiber sheets containing these ultrafine fibers are expected to be used in a variety of future applications, and research towards industrialization is intensive.

[0003] For example, Patent Document 1 describes a nanofiber sheet comprising a nanofiber layer composed of nanofibers with an equivalent circular diameter of 3000 nm or less, with a removable substrate layer disposed on one side of the nanofiber layer. The document further describes placing the nanofiber sheet in contact with the surface of an object, peeling off the substrate layer, and transferring the nanofiber layer to the object. In this case, moistening the surface of the nanofiber layer or the object facilitates the transfer.

[0004] Patent Document 2 describes a nanofiber sheet having a gradient region where the thickness of the nanofiber layer gradually increases from the peripheral edge toward the inner side. The document also describes the use of the nanofiber layer, which remains after the substrate layer is removed from the nanofiber sheet, by affixing it to an object. When affixed to an object, the gradient region obscures the outer edge of the nanofiber layer, making it difficult to identify.

[0005] Furthermore, Patent Document 3 describes a cosmetic sheet that retains cosmetics or cosmetic ingredients within a mesh structure composed of nanofibers of 2000 nm or less. Patent Document 4 describes a hand mask made of a liquid-retaining material as an article containing liquids such as these cosmetics. However, the liquid-retaining material does not include nanofibers such as those described above, but rather includes conventional nonwoven fabrics, paper, and cotton wool.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 2010-167780

[0009] Patent Document 2: Japanese Patent Application Laid-Open No. 2020-90097

[0010] Patent Document 3: Japanese Patent Application Laid-Open No. 2008-179629

[0011] Patent Document 4: Japanese Patent Application Laid-Open No. 2017-137585

[0012] The purpose of the background art described in this specification is to provide a general context for the disclosure of the present invention. The content of this background art section, including the work of the currently named inventors, as well as any information that may not be recognized as prior art at the time of application, does not constitute any express or implied admission that such information is prior art to the present invention. Summary of the Invention

[0013] The present invention provides a method for using a laminated fiber sheet, comprising moistening a laminated fiber sheet having an inner sheet laminated on one surface of an outer sheet with a liquid.

[0014] It is preferred that the inner sheet and the outer sheet be insoluble in liquid substances.

[0015] The median fiber diameter of the inner sheet is preferably 0.3 μm or more and 5 μm or less.

[0016] It is preferred that the median fiber diameter of the outer sheet is larger than the median fiber diameter of the inner sheet.

[0017] It is preferable that the inner sheet and the outer sheet are integrated.

[0018] Preferably, the method for using the laminated fiber sheet includes: applying the laminated fiber sheet with the inner sheet facing the object; and applying the liquid substance.

[0019] The present invention also provides a laminated fiber sheet including an inner sheet laminated on one surface of an outer sheet.

[0020] The laminated fiber sheet preferably has the structure of the inner sheet and the outer sheet described above.

[0021] It is preferred that the laminated fiber sheet contains a liquid substance, and the liquid substance is concentrated on the inner sheet.

[0022] The above and other features and advantages of the present invention will become more apparent from the scope of the invention and the following description with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a cross-sectional view schematically showing one embodiment of the laminated fiber sheet of the present invention.

[0024] Figure 2 In the drawings, (A) is a photograph showing a state where the inner sheet alone is grasped with fingers, and (B) is a photograph showing a state where the laminated fiber sheet of the present invention is grasped with fingers.

[0025] Figure 3 This is an explanatory diagram schematically showing the fusion points at the intersections of the ultrafine fibers of the inner sheet.

[0026] Figure 4 This is a photograph showing an example of an observation image used when measuring the ratio of the number of fusion points to the number of fiber intersections.

[0027] Figure 5 Schematic diagrams showing an example in which the intersections of fibers on both sides at the interface between the inner sheet and the outer sheet include fusion points. (A) shows the state before elongation, and (B) shows the state after elongation.

[0028] Figure 6 This is an explanatory diagram schematically showing a state in which an example of the laminated fiber sheet of the present invention is applied to an object.

[0029] Figure 7 (A) is a photograph showing the result of transferring the liquid from the outer sheet to the filter paper in Example 1. Figure 7 (B) is a photograph showing the result of transferring the liquid from the inner sheet to the filter paper in Example 1. DETAILED DESCRIPTION

[0030] The present invention relates to a laminated fiber sheet capable of preventing stuffiness and suppressing stickiness on the outside while maintaining a continuous wet state of a liquid substance.

[0031] As described in Patent Document 3, sheets containing ultrafine fibers can be used to create a continuous and uniform wet state with liquids. However, due to the high permeability of liquids, these ultrafine fiber sheets, when used alone, tend to wet not only the surface facing the object but also the outer surface opposite it. Consequently, when a sheet holding liquid is attached to an object, the outer surface may become sticky, and the liquid may transfer to surrounding objects.

[0032] Regarding this, as described in Patent Document 4, it is also possible to place a liquid-repellent material such as vinyl on the outside. However, considering the stuffiness caused by vinyl, there are limitations on the wear time. Patent Documents 1 and 2 do not mention this issue.

[0033] In contrast, the laminated fiber sheet of the present invention can prevent stuffiness and suppress stickiness on the outside while maintaining a continuous moist state of the liquid substance.

[0034] These and other objects of the present invention can be achieved individually or in combination by the following findings.

[0035] The numerical limits or ranges described in this specification include the values ​​at the ends of the numerical limits or ranges. In addition, all values ​​and partial ranges within the numerical limits or ranges are expressly included as if explicitly stated.

[0036] The singular words and the like used in this specification have the meaning of "one or more".

[0037] It is obvious that various modifications and variations of the present invention are possible according to the above and following disclosures. Therefore, it should be understood that within the technical scope of the present invention, embodiments not explicitly described in this specification can also implement the present invention.

[0038] The entire contents of the above-mentioned and following patent documents and other documents are the same as those of the detailed description and are hereby incorporated by reference into this specification.

[0039] Hereinafter, a preferred embodiment of the laminated fiber sheet of the present invention will be described with reference to the drawings.

[0040] The laminated fiber sheet 10 of the present invention preferably includes an inner sheet 1 laminated on one surface of the outer sheet 2. The inner sheet 1 is preferably disposed on one surface 10T of the front and back surfaces of the laminated fiber sheet 10, and the outer sheet 2 is preferably disposed on the other surface 10B opposite to the one surface 10T.

[0041] The laminated fiber sheet 10 of the present invention is typically applied to an object described below with the inner sheet 1 facing the object. "Applying to an object" means contacting the laminated fiber sheet 10 with the surface of the object. The laminated fiber sheet 10 is preferably adhered to the object by wetting.

[0042] The laminated fiber sheet 10 of the present invention may further include another fiber layer in addition to the inner sheet 1 and the outer sheet 2. In this case, from the perspective of effectively utilizing the properties of the inner sheet 1 described below and not impairing the interaction between the inner sheet 1 and the outer sheet 2, the other fiber layer is preferably located on the other side 10B of the outer sheet 2. In other words, the inner sheet 1 and the outer sheet 2 are preferably adjacent to each other in all cases.

[0043] The method of using the laminated fiber sheet 10 of the present invention typically involves moistening the laminated fiber sheet 10 with a liquid. More specifically, the inner sheet 1 (particularly the surface of the inner sheet 1 facing the object) is moistened with the liquid. "Wetted" or "wet state" refers to the laminated fiber sheet 10 being moistened with the liquid, i.e., the presence of the liquid. The method of using the laminated fiber sheet 10 and its behavior with respect to the liquid during this method of use will be described later.

[0044] In addition, the amount of the liquid material used to form the wet state in the laminated fiber sheet 10 is preferably 0.2 mg / cm 2 More preferably, 0.3 mg / cm 2 More than, particularly preferably 0.4 mg / cm 2More than 10 mg / cm 2 Less than 7 mg / cm 2 Below, particularly preferably 5 mg / cm 2 Less than 4 mg / cm 2 the following.

[0045] The "liquid" mentioned above refers to a substance that is liquid at 20°C. Furthermore, in the present invention, the "liquid" refers to an object that moistens the laminated fiber sheet. Examples of the liquid include: liquids such as water, aqueous solutions, and aqueous dispersions; gels thickened with a thickener; oils that are liquid or solid at 20°C; oil solutions containing 10% by mass or more of such oils; and emulsions (O / W emulsions, W / O emulsions) containing such oils and surfactants such as nonionic surfactants.

[0046] The liquid material preferably contains a polyol that is liquid at 20° C. This prevents the liquid material from being easily deactivated from its transparent state due to evaporation.

[0047] The polyol may contain, for example, one or two or more selected from ethylene glycol, propylene glycol, 1,3-butylene glycol, dipropylene glycol, polyethylene glycol having a mass average molecular weight of 2000 or less, glycerol, and diglycerol.

[0048] The liquid may contain an oil that is liquid at 20° C. The oil may contain one or more selected from hydrocarbon oils, esters composed of linear or branched fatty acids and linear or branched alcohols or polyols, ester oils, and silicone oils.

[0049] The hydrocarbon oil may contain one or two or more selected from the group consisting of liquid alkanes, squalane, squalene, n-octane, n-heptane, cyclohexane, light isoparaffins, and liquid isoparaffins.

[0050] The ester composed of a straight-chain or branched fatty acid and a straight-chain or branched alcohol or polyol may include one or more selected from octyldodecyl myristate, myristyl myristate, isocetyl stearate, isocetyl isostearate, cetearyl isononanoate, diisobutyl adipate, di-2-ethylhexyl sebacate, isopropyl myristate, isopropyl palmitate, diisostearyl malate, neopentyl glycol dicaprate, and alkyl benzoate (with 12 to 15 carbon atoms).

[0051] The ester oil may contain one or two or more selected from triglycerol fatty acid esters (triglycerides).

[0052] As triglyceride fatty acid esters, (caprylic acid / capric acid) triglyceride and the like can be included.

[0053] The silicone oil may contain one or more selected from dimethylpolysiloxane, dimethylcyclopolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane and higher alcohol-modified organopolysiloxane.

[0054] The liquid may contain an oil that is solid at 20° C. The oil may contain one or more selected from petrolatum, cetyl alcohol, stearyl alcohol, ceramide, and the like.

[0055] Such a liquid material is preferably a liquid preparation that does not contain any pharmaceutical substances and is used for cosmetic or aesthetic purposes.

[0056] The "object" to which the laminated fiber sheet 10 is applied can include various items, such as, but not limited to, human skin (skin), nails, teeth, gums, and hair; skin (skin), nails, teeth, and gums of non-human mammals; and plant surfaces such as branches and leaves.

[0057] The method of applying the laminated fiber sheet 10 to the object by moistening it with the liquid can be used, for example, to enhance the surface condition of the object for cosmetic or aesthetic reasons. For example, when the object is human skin, the method is preferably used to enhance the skin's barrier function or moisturizing function, whiten the skin, conceal wrinkles or blemishes, apply makeup, or otherwise enhance the skin's appearance. The method preferably does not include procedures involving surgery, treatment, or diagnosis performed on the human body by a physician or a person acting under a physician's instructions.

[0058] The inner sheet 1 and the outer sheet 2 included in the laminated fiber sheet 10 of the present invention are preferably insoluble in the liquid substance.

[0059] The term "insoluble in liquid" means that the fiber diameter does not decrease due to dissolution. Specifically, a 50 mm square laminated fiber sheet is immersed in a liquid equivalent to 10 times its mass at 1 atmosphere and 23°C. After 24 hours, the median fiber diameter of each layer after immersion is at least equal to the median fiber diameter before immersion. The measurement method is as described below in the "Method for Measuring Median Fiber Diameter" section.

[0060] In the above-mentioned measurement method, the liquid substance can be applied regardless of its properties, as long as it can wet the laminated fiber sheet.

[0061] For example, when the liquid substance is water, the measurement is performed using deionized water.

[0062] The inner sheet 1 preferably contains fibers (also called "nanofibers") having a median fiber diameter (P1) of 0.3 μm or more and 5 μm or less. These fibers are also called ultrafine fibers or nanofibers and can be formed, for example, by electrospinning. Because the fibers of this inner sheet 1 are fine, the unevenness per fiber unit is more suppressed than in fiber layers such as conventional nonwoven fabrics, thereby increasing the contact area with the target surface (e.g., the skin surface) and improving the adhesion to the target surface.

[0063] The outer sheet 2 preferably has a larger median fiber diameter than the inner sheet 1. Examples of such an outer sheet 2 include nonwoven fabrics obtained by a spunbond method (hereinafter also referred to as spunbond nonwoven fabrics).

[0064] Furthermore, the inner sheet 1 and the outer sheet 2 are preferably integrated. Specifically, the inner sheet 1 and the outer sheet 2 are preferably adjacent to each other and integrated by fusing the fibers constituting the inner sheet 1 and the fibers constituting the outer sheet 2.

[0065] With the above structure, a very strong capillary force acts from the outer sheet 2 to the inner sheet 1 in the thickness direction of the laminated fiber sheet 10. Furthermore, the inner sheet 1 has a high liquid retention capacity due to the extremely large specific surface area of ​​the ultrafine fibers, and is excellent in preventing liquid from flowing back to the outer sheet 2, which is the fiber layer laminated thereon.

[0066] (Method for measuring median fiber diameter)

[0067] (1) The laminated fiber sheet 10 is peeled off between the fiber layers, and the fiber layer to be measured is removed. This fiber layer is cut into 10 mm × 10 mm pieces. This is previously attached to a scanning electron microscope sample stage (manufactured by Oken Shoji Co., Ltd.) using a conductive carbon double-sided tape (manufactured by Oken Shoji Co., Ltd.).

[0068] (2) The sample stage with the fiber layer attached was placed in a sputtering apparatus (IonSputter E-1030, manufactured by Hitachi High-Technologies Corporation). Platinum-palladium (Pt-Pd) was deposited under an argon atmosphere at a pressure of 6 Pa. The distance between the fiber layer mounting surface and the Pt-Pd electrode was set to 30 mm, the deposition time was set to 80 seconds, and the deposition current was set to 30 mA.

[0069] (3) The sample stage was placed on a scanning electron microscope (SEM) (manufactured by Hitachi High-Technologies Corporation, S-4300SE / N), and observation images were acquired in high-definition mode (accelerating voltage: 5 kV, workpiece distance: 10 mm, observation magnification 500x or 1000x). A total of 15 observation images were acquired for the same sample at different observation locations.

[0070] (4) Based on the observation image obtained in (3) above, the fiber diameter of the fiber layer was measured using image analysis software (WinRooF2015 manufactured by Mitani Shoji Co., Ltd.). Based on the fiber diameter measurement values ​​of a total of 600 fibers, the number average diameter, the diameter of 10% (from the thinnest diameter side) (D10), the diameter of 50% (median diameter), and the diameter of 90% (D90) were calculated. The median diameter was used as the representative value of the fiber diameter.

[0071] Due to this effect, when the laminated fiber sheet 10 contains the liquid during use, the liquid can be transferred from the outer sheet 2 to the inner sheet 1. The liquid is not limited to being applied from the outer sheet 2's front surface (the other surface 10B) of the laminated fiber sheet 10; even when the entire laminated fiber sheet 10 contains the liquid, the liquid can easily transfer to the inner sheet 1. Furthermore, the inner sheet 1 has the function of pressing the liquid that is about to return to the outer sheet 2 back to the inner sheet 1 or retaining it there.

[0072] Furthermore, the inner sheet 1, by containing the liquid substance, becomes a liquid-retaining layer, forming a uniform liquid film between the inner sheet 1 and the surface of the object, and maintaining this liquid film for a long time. This phenomenon, combined with the above-mentioned action, makes the inner sheet 1 have a fiber structure composed of ultrafine fibers, which minimizes the unevenness of the fiber units as in the conventional art, contributing to excellent smoothness on the surface of the object.

[0073] As described above, the laminated fiber sheet 10 of the present invention forms a uniform liquid film (uniformly wetted state) of the liquid substance on the inner sheet 1 through the synergistic effect of the outer sheet 2 and the inner sheet 1. This significantly improves the adhesion of the liquid substance to the surface of the object compared to conventional methods, and this adhesion can be maintained for a long time. As a result, the liquid substance can uniformly act on the object for a long time.

[0074] Thus, when the laminated fiber sheet 10 is wet with the liquid, the liquid tends to be attracted to the inner sheet 1 and can be easily retained in this state. Consequently, the outer sheet 2's front surface (the other side 10B) in the laminated fiber sheet 10 is easily dry and can be easily retained in this state. In other words, even if the laminated fiber sheet 10 touches the outer sheet 2's front surface (the other side 10B), stickiness caused by the liquid can be suppressed.

[0075] The "bias" is determined by comparing the ratio (mass ratio) of the mass of the liquid substance contained in the inner sheet 1 divided by the mass of the inner sheet 1 (excluding the liquid substance) with the ratio (mass ratio) of the mass of the liquid substance contained in the outer sheet 2 divided by the mass of the outer sheet 2 (excluding the liquid substance). For example, if the mass ratio of the inner sheet 1 is greater than the mass ratio of the outer sheet 2, it is considered that the liquid substance is biased toward the inner sheet 1.

[0076] When this "bias" is formed, it is preferred that the inner sheet 1 be moistened and the outer sheet 2 be dry. The "dry state" mentioned above refers to a state where the mass ratio is 1.5 or less. On the other hand, the "moistened state" (wet state) mentioned above refers to a state where the mass ratio exceeds 1.5.

[0077] (Bias Judgment Method)

[0078] (1) 0.15 g of a liquid substance was applied to a 50 mm square laminated fiber sheet 10 from the outer sheet 2 side.

[0079] (2) The coated laminated fiber sheet 10 was allowed to stand for 10 minutes and then collected.

[0080] (3) Separate the inner sheet 1 and the outer sheet 2, measure their respective masses, and calculate the mass of the liquid material based on the difference between the mass of the sheet and the mass before the liquid material is applied. Because the mass of the inner sheet 1 and the outer sheet 2 cannot be separated before the liquid material is applied, the value converted from the grammage is used.

[0081] (4) The ratio (mass ratio) of the mass of the liquid substance contained in the inner sheet 1 divided by the mass of the inner sheet 1 before the liquid substance is applied is calculated, and the mass ratio is similarly calculated for the outer sheet 2. When comparing the mass ratio of the inner sheet 1 with the mass ratio of the outer sheet 2, the larger value is determined to be a biased state.

[0082] The laminated fiber sheet 10 of the present invention facilitates heat dissipation by utilizing the ventilation spaces between the fibers of the dry outer sheet 2. Regarding this point, when the liquid is applied, while the inner sheet 1 remains moist, the fibers of the adjacent outer sheet 2, which have larger diameters, are larger, and the liquid evaporates more readily than in the inner sheet 1, which has smaller fibers. This facilitates an endothermic reaction during liquid evaporation. For example, immediately after application of the liquid, a cool sensation may be felt due to this endothermic reaction. This phenomenon, combined with the liquid, can promote heat transfer. Furthermore, due to this heat transfer, some of the liquid in the outer sheet 2 may evaporate, further increasing the likelihood of the aforementioned "bias" and "drying state" over time.

[0083] As described above, the laminated fiber sheet 10 can prevent stuffiness and suppress stickiness on the outside by the combined effect of the inner sheet 1 and the outer sheet 2 while maintaining a continuous moist state of the liquid.

[0084] In the laminated fiber sheet 10, from the viewpoint of being able to more clearly and quickly demonstrate the mobility of the above-mentioned liquid substance, the ratio (P2 / P1) of the median fiber diameter (P2) of the outer sheet 2 to the median fiber diameter (P1) of the inner sheet 1 is preferably 1.5 or more, more preferably 10 or more, and even more preferably 20 or more.

[0085] Furthermore, from the viewpoint of maintaining the softness of the entire sheet, the ratio (P2 / P1) is preferably 170 or less, more preferably 150 or less, and even more preferably 100 or less.

[0086] In addition, from the perspective of more clearly presenting the mobility of the above-mentioned liquid, the bias of the liquid, and further improving the adhesion with the above-mentioned object, the median fiber diameter (P1) of the inner sheet 1 is preferably 5 μm or less, more preferably 3 μm or less, further preferably 2 μm or less, and particularly preferably 1 μm or less.

[0087] Furthermore, the median fiber diameter (P1) of the inner sheet 1 is preferably 0.3 μm or more, more preferably 0.4 μm or more, and even more preferably 0.5 μm or more from the viewpoint of improving productivity.

[0088] The outer sheet 2 preferably contains fibers having a median fiber diameter (P2) of 5 μm or greater and 50 μm or less. By containing fibers having this median fiber diameter, the outer sheet 2 can further improve the aforementioned dry state and heat release properties without compromising the aforementioned adhesion properties of the inner sheet 1. This imparts sheet strength and rigidity to the laminated fiber sheet 10 as a whole, thereby improving resistance to tearing and friction. The median fiber diameter of this outer sheet 2 can be appropriately set according to the methods commonly used for this type of article.

[0089] The median fiber diameter (P2) of the fibers contained in the outer sheet 2 is preferably 50 μm or less, more preferably 30 μm or less, and even more preferably 25 μm or less from the viewpoint of maintaining the softness of the entire sheet.

[0090] The median fiber diameter (P2) of the fibers contained in the outer sheet 2 is preferably 5 μm or more, more preferably 10 μm or more, and even more preferably 15 μm or more from the viewpoint of further improving resistance to tearing and friction.

[0091] In the laminated fiber sheet 10, the basis weight (M1) of the inner sheet 1 is preferably 1 g / m 2 Above and 8g / m 2The following. By having the grammage (M1) of the inner sheet 1 within this range, it is possible to more easily maintain the softness, adhesion to the surface of the object, and uniformity of the liquid film of the liquid substance possessed by the inner sheet 1, and it is possible to have strength without damaging these properties. In addition, in the inner sheet 1 whose grammage is suppressed within the above range, the number of ultrafine fibers with the above median fiber diameter is reduced accordingly, and the number of fiber voids is also reduced. As a result, the light scattering caused by the presence of the above fiber voids can be suppressed, making the inner sheet 1 easier to be transparent. In particular, when the above liquid substance is applied, since the fiber voids are filled with the above liquid substance to form a uniform film, it is less likely to cause the above light scattering, and the transparency can be made stronger.

[0092] From the viewpoint of further enhancing the above-mentioned effects and further enhancing the strength, the basis weight (M1) of the inner sheet 1 is preferably 1 g / m 2 More than 1.5 g / m 2 More preferably, 2 g / m 2 above.

[0093] In addition, from the viewpoint of further improving the softness and the adhesion to the above-mentioned objects, the basis weight (M1) of the inner sheet 1 is preferably 8 g / m 2 Below, more preferably 6g / m 2 Below, more preferably 5g / m 2 the following.

[0094] In the laminated fiber sheet 10, the basis weight (M2) of the outer sheet 2 is preferably 8 g / m 2 Above and 50g / m 2 When the outer sheet 2's grammage (M2) is within this range, the outer sheet 2's dry state and heat release properties can be further improved, further strengthening the overall strength of the laminated fiber sheet 10 and further enhancing its resistance to cracking and friction. Furthermore, in an outer sheet 2 with a grammage within the above range, the number of fibers with the median fiber diameter is reduced. This facilitates transparency of the outer sheet 2, particularly when the formulation is applied.

[0095] The basis weight (M2) of the outer sheet 2 is preferably 8 g / m2 from the viewpoint of further improving the overall strength of the laminated fiber sheet 10. 2 More than 15 g / m 2 More preferably, 17 g / m 2 above.

[0096] In addition, the weight (M2) of the outer sheet 2 is preferably 50 g / m2 from the viewpoint of further improving the dry state and heat release of the outer sheet 2 and not damaging the softness of the inner sheet 1 and the close contact with the skin surface. 2Below, more preferably 40g / m 2 Below, more preferably 30g / m 2 the following.

[0097] The ratio (M2 / M1) of the gram weight (M2) of the outer sheet 2 to the gram weight (M1) of the inner sheet 1 is preferably greater than 1, more preferably greater than 1.6, and even more preferably greater than 2, from the viewpoint of further improving the mobility of the above-mentioned liquid, the bias of the liquid toward the inner sheet 1, the dry state and heat release of the outer sheet 2.

[0098] The ratio (M2 / M1) is preferably 50 or less, more preferably 34 or less, and even more preferably 25 or less from the viewpoint of maintaining the softness of the inner sheet 1 and the close contact with the surface of the object.

[0099] In the laminated fiber sheet 10 , the thickness of the inner sheet 1 is preferably 3 μm or more, more preferably 4 μm or more, and even more preferably 5 μm or more, from the viewpoint of forming a liquid film of the liquid substance well.

[0100] The thickness of the inner sheet 1 is preferably 50 μm or less, more preferably 40 μm or less, and even more preferably 30 μm or less, from the viewpoint of improving the softness of the inner sheet 1 and the adhesion to the surface of the object.

[0101] From the viewpoint of further improving the overall strength of the laminated fiber sheet 10 , the thickness of the outer sheet 2 is preferably 10 μm or more, more preferably 30 μm or more, and even more preferably 50 μm or more.

[0102] The thickness of the outer sheet 2 is preferably 500 μm or less, more preferably 300 μm or less, and even more preferably 200 μm or less from the viewpoint of further improving the dry state and heat release of the outer sheet 2 and not damaging the softness of the inner sheet 1 and the close contact with the skin surface.

[0103] In the laminated fiber sheet 10, from the perspective of further improving the integrity of the inner sheet 1 and the outer sheet 2, it is preferred that the inner sheet 1 and the outer sheet 2 be made of the same type of material (same series of materials). The "same type of material" refers to a material having a polymer structure with the same repeating unit (monomer structure). Specifically, the same type of material can be selected from olefin resins, diene resins, polyurethane resins, and copolymers thereof.

[0104] Since the inner sheet 1 and the outer sheet 2 are made of the same material, the molecular structures of the resin components are similar, and thus the fibers are highly compatible with each other. As a result, the inner sheet 1 and the outer sheet 2 can be easily and firmly welded together, thereby improving the integrity of the laminated fiber sheet 10.

[0105] The laminated fiber sheet 10 preferably has stretchability, thereby improving the conformability and tracking properties of the laminated fiber sheet 10 to the object, and further improving the adhesion of the liquid film of the liquid substance formed on the inner sheet 1 to the object.

[0106] Regarding the stretchability, the inner sheet 1 and the outer sheet 2 preferably contain an elastomer of the same type selected from the above-mentioned olefin resins, diene resins, polyurethane resins, and copolymers thereof, and thus have stretchability.

[0107] (Measurement method when inner sheet 1 and outer sheet 2 contain the same type of material)

[0108] To determine whether the inner sheet 1 and outer sheet 2 contain the same type of material, the sheets are peeled off and the resin composition contained in each sheet is measured. The resin composition is subjected to various analyses, such as nuclear magnetic resonance (NMR) analysis and infrared spectroscopy (IR). The positions of the signals and spectra obtained from these analyses are used to identify the molecular backbone structure and the functional groups at the ends of the molecular structure. This allows the type of resin contained in each sheet to be identified and confirmed. The resin compositions determined for each sheet are then compared to determine whether they contain the same type of material.

[0109] The laminated fiber sheet 10 of the present invention is not easily peeled off at the interface between the inner sheet 1 and the outer sheet 2 during expansion and contraction because the inner sheet 1 and the outer sheet 2 adjacent to each other are both stretchable and highly integrated. By suppressing the peeling, the laminated fiber sheet 10 as a whole generates sheet strength and rigidity, which can make the whole exhibit stiffness. Thus, the inner sheet 1 can easily expand and contract together with the outer sheet 2. As a result, the laminated fiber sheet 10 as a whole has durability that can withstand repeated expansion and contraction actions. That is, the inner sheet 1 and the outer sheet 2 of the laminated fiber sheet 10 of the present invention have high integrity, and the whole expands and contracts in a state with increased strength and rigidity. Therefore, during the expansion and contraction behavior of the laminated fiber sheet 10, the inner sheet 1 is not easily wrinkled or rubbed. In addition, the hair loss of the inner sheet 1 due to friction is also suppressed.

[0110] Thus, the overall stretchability and sheet strength of the laminated fiber sheet 10 are improved, and even when stretchable, the resistance to tearing and friction can be improved. Thus, by the overall stretchability of the laminated fiber sheet 10, the inner sheet 1 can follow the shape and various changes (movements) of the surface of the object, etc., and can fully demonstrate the above-mentioned adhesion characteristics even under such changes.

[0111] The laminated fiber sheet 10 of the present invention has rigidity due to the integration of the inner sheet 1 and the outer sheet 2, which can improve the handleability. That is, compared with the case of a fiber sheet consisting only of ultrafine fibers, the inner sheet 1 can achieve a stiffness ( Figure 2(A) and (B)), and the effect of easier handling. For example, when a laminated fiber sheet 10 is to be taken out from a stack of multiple sheets or stored in a bag or container for use (for example, to be attached to the surface of the above-mentioned object), the stiffness will significantly affect the ease of removal. In addition, when taking out, the laminated fiber sheet 10 of the present invention is different from the fiber sheet with only the inner sheet 1 (for example, Figure 2 Compared with (A), it is less likely to curl, which improves workability. As a result, it can be attached to the surface of the skin and other objects without wrinkling.

[0112] The same material is preferably an olefin resin from the viewpoint of improving the integrity of the inner sheet 1 and the outer sheet 2 and improving the stretchability of the laminated fiber sheet 10 containing them. By using an olefin resin, the inner sheet 1 and the outer sheet 2 are less likely to separate when the laminated fiber sheet 10 is stretched or contracted.

[0113] From the same perspective, the inner sheet 1 preferably contains a low-crystalline olefin resin. The "low crystallinity" mentioned above means a degree of crystallinity of 10.5% or less, which can be measured by the following method. By containing a low-crystalline olefin resin in the inner sheet 1, the inner sheet 1 itself can be easily stretched.

[0114] When the inner sheet 1 contains a low-crystalline olefin resin, the mass proportion of the low-crystalline olefin resin in the inner sheet 1 is preferably 70 mass% or more, more preferably 80 mass% or more, further preferably 90 mass% or more, even more preferably 92 mass% or more, and even more preferably 94 mass% or more.

[0115] (Measurement method when the inner sheet 1 contains a low-crystalline olefin resin)

[0116] The resin composition constituting the inner sheet 1 is subjected to various analyses such as NMR analysis and IR analysis. Based on the signals and spectral positions obtained from these analyses, the structure of the molecular skeleton and the structure of the functional groups at the ends of the molecular structure are identified. In this way, the type of the resin contained is identified and determined.

[0117] Next, differential scanning calorimetry was used to measure crystallinity and confirm low crystallinity. The total heat of fusion obtained when the sample was heated was divided by the heat of fusion for complete crystallization. If this value was less than 10.5%, it was determined to contain a low-crystalline olefin resin.

[0118] The same type of materials mentioned above can be exemplified by the following specific examples from the viewpoint of improving the integrity of the inner sheet 1 and the outer sheet 2 and improving the stretchability of the laminated fiber sheet 10 containing them.

[0119] That is, examples of the olefin-based resin include polypropylene (hereinafter referred to as "PP") and polyethylene.

[0120] Examples of the low-crystalline olefin resin include α-olefins such as polypropylene with controlled stereoregularity (polypropylene polymerized with controlled stereoregularity using a metallocene catalyst).

[0121] Examples of the diene resin include polybutadiene and polyisoprene.

[0122] Examples of the polyurethane-based resin include polyurethane and the like.

[0123] Examples of the copolymers of olefin resins, diene resins, and polyurethane resins include ethylene-propylene copolymers, ethylene-1-butene copolymers, ethylene-1-octene copolymers, propylene-1-butene copolymers, propylene-1-octene copolymers, ethylene-isoprene copolymers, ethylene-butadiene copolymers, propylene-isoprene copolymers, propylene-butadiene copolymers, ethylene-propylene-isoprene copolymers, and ethylene-propylene-butadiene copolymers.

[0124] The laminated fiber sheet 10 preferably has an inner sheet 1 and an outer sheet 2 that are both stretchable and integrated. Here, "stretchable" means that the sheet can be stretched and, when the force is released from a state stretched 50% relative to the original length (a length of 150% of the original length), can recover to a length of 125% or less of the original length.

[0125] In the laminated fiber sheet 10 of the present invention, the elongation in one direction Y (also referred to as the "Y direction") in the planar direction is preferably 20% to 100%, and the elongation in a direction X (also referred to as the "X direction") perpendicular to the one direction Y is preferably 0% to 30%. By creating a difference in elongation in these two mutually perpendicular directions, the stretchability of the laminated fiber sheet 10 can be directional. The one direction Y and the direction X perpendicular to the one direction Y can be appropriately determined according to the intended use of the laminated fiber sheet 10. For example, the longitudinal direction of the laminated fiber sheet 10 can be the one direction Y, and the width direction can be the direction X perpendicular to the one direction Y. In this case, it is preferable that the longitudinal direction of the laminated fiber sheet 10 be aligned with the desired stretch direction in the intended article.

[0126] (Elongation measurement method)

[0127] The elongation of the laminated fiber sheet 10 is expressed as the percentage (%) of the elongation of a 20 mm wide and 70 mm long test piece held at a gripping distance of 50 mm under a tensile load of 1.2 N relative to the 50 mm gripping distance. More specifically, the elongation of the test piece before the elongation test is defined as L0, and the elongation at break is defined as LB. The elongation can be calculated as: elongation (%) = 100 × (LB - L0) / L0. Measurements are performed along any two mutually orthogonal directions within the plane of the laminated fiber sheet 10, for example, the longitudinal direction and the width direction orthogonal to the longitudinal direction.

[0128] The laminated fiber sheet 10 has directional stretchability due to the aforementioned difference in elongation, which allows for well-controlled stretchability tailored to the intended use, reducing excessive stretching in undesirable directions and the excessive load associated with stretching. This effectively prevents wrinkling, rubbing, and tearing of the inner sheet 1.

[0129] For example, when the laminated fiber sheet 10 is formed into gloves, it is preferable to set the stretchability in the longitudinal direction of the fingers to be greater and the stretchability in the width direction perpendicular to the longitudinal direction to be smaller. This allows for the provision of gloves that fit the user's fingertips and between the fingers with excellent fit.

[0130] On the other hand, when the laminated fiber sheet 10 is formed into a glove, it is also preferable to set the stretchability in the longitudinal direction of the fingers to be small, and to set the stretchability in the width direction perpendicular to the longitudinal direction to be large. This allows the glove to fit snugly according to the thickness of the user's fingers when the laminated fiber sheet 10 is worn.

[0131] The elongation (T1) of the laminated fiber sheet 10 in one direction Y is preferably 20% or more, more preferably 25% or more, and even more preferably 30% or more from the viewpoint of further enhancing the above-mentioned effects.

[0132] The elongation (T1) of the laminated fiber sheet 10 in one direction Y is preferably 100% or less, more preferably 80% or less, and even more preferably 60% or less, from the viewpoint of being able to process the laminated fiber sheet 10 into any shape and wear it.

[0133] The elongation (T2) of the laminated fiber sheet 10 in the direction X orthogonal to the one direction Y is preferably 0% or more from the viewpoint of continuously conveying the laminated fiber sheet 10 .

[0134] The elongation (T2) of the laminated fiber sheet 10 in the direction X orthogonal to the one direction Y is preferably 30% or less, more preferably 25% or less, and even more preferably 20% or less from the viewpoint of continuously conveying the laminated fiber sheet 10 .

[0135] The absolute value |T1-T2| of the difference between the elongation (T1) in one direction Y of the laminated fiber sheet 10 and the elongation (T2) in the direction X perpendicular to the one direction Y is preferably greater than 0, more preferably greater than 10, and even more preferably greater than 20, from the viewpoint of making the directionality of the stretchability of the laminated fiber sheet 10 clearer and more effectively suppressing wrinkles, friction, and rupture of the inner sheet 1.

[0136] From the perspective of improving the wearability of the laminated fiber sheet 10 on an object such as skin, the absolute value of the difference |T1-T2| is preferably 70 or less, more preferably 60 or less, and even more preferably 50 or less. Thus, for example, when the laminated fiber sheet 10 is used in gloves, the elongation in two orthogonal directions of the gloves can be balanced, making the gloves easier to put on.

[0137] The directionality of the aforementioned stretchability of the laminated fiber sheet 10 is primarily determined by the outer sheet 2, as opposed to the inner sheet 1. Because the inner sheet 1 contains the aforementioned ultrafine fibers, direct spinning and deposition of a resin solution or resin melt using, for example, electrospinning is difficult, making it difficult to achieve directionality in stretchability. Therefore, it is preferable that the outer sheet 2 primarily imparts directionality to the laminated fiber sheet 10. Furthermore, since the directionality of the aforementioned stretchability of the laminated fiber sheet 10 is primarily determined by the outer sheet 2, it is possible to effectively control the stretchability of the outer sheet 2 so that it stops before the inner sheet 1 ruptures during stretching. Regarding the directionality of the stretchability of the outer sheet 2, for example, by stretching the outer sheet 2 in the transport direction and then cooling and solidifying it during transport, it is possible to form an outer sheet 2 that is not stretchable in the transport direction but stretchable in an orthogonal direction.

[0138] In the laminated fiber sheet 10, from the viewpoint of further improving the strength of the inner sheet 1 itself, the weld points (e.g. Figure 3 The fusion points 31 of the intersections of the microfibers 11 and 11 are Figure 4 The ratio of the number of the inner sheet 1 (the portion surrounded by the reference numerals D4, D14, and D1) to the number of fiber intersections is preferably 50% or more, more preferably 70% or more. As a result, the individual ultrafine fibers of the inner sheet 1 are fixed at the intersections to improve strength. That is, the integrity of the inner sheet 1 itself is strengthened. For example, when the surface of the inner sheet 1 on one side 10T of the laminated fiber sheet 10 is touched with a finger, the fibers are less likely to pill and the fibers are suppressed from falling off. In addition, because the bonding area is suppressed at the fusion points at the fiber intersections, the rigidity of the inner sheet 1 itself can be suppressed from being too high compared to surface welding, while maintaining softness and being able to easily present the above-mentioned close-fitting characteristics.

[0139] (Ratio of the number of fusion points to the number of fiber intersections)

[0140] The same operations as those in (1), (2) and (3) of the above-mentioned (Method for measuring the median fiber diameter) items were performed, and an SEM observation image with an observation magnification of 1000 times was obtained for the fiber layer of the measurement object. The observation location was changed for the same sample, and a total of 5 measurements were made. Focus was made on the surface side of the sample at each location, and a total of 5 observation images were obtained. The image quality was set to 0.128 mm in width and 0.096 mm in height. Based on the obtained observation images, the fiber intersections were marked using image analysis software (WinRooF2015 manufactured by Mitani Shoji Co., Ltd.), and the number of fusion points at the fiber intersections was recorded. The ratio of the number of fusion points to the total number of fiber intersections was calculated by the following formula (I). This evaluation was performed by a total of 2 observers and recorders. The number of fiber intersections was counted by the observer manually marking them in the above-mentioned image analysis software. Regarding the fusion points, the recorder counted the fiber intersections classified as fusion points by the observer according to the following fusion point definition.

[0141] Welding point ratio [%]

[0142] =Number of fusion points / Total number of fiber intersections × 100 (Formula (I))

[0143] The fiber intersections and the fusion points of the fiber intersections are defined as follows.

[0144] (Fiber intersection)

[0145] For the SEM observation image of the fiber layer of the measurement object, the image itself is magnified 3 times (300%) using a 410mm×260mm monitor. In this case, the focus is selected within a range where the width between the boundary lines of the fiber shape (the fiber width confirmed in the observation image) does not exceed 1mm. The parts where they intersect, or the parts where they are in contact (connected) although not intersecting, or the parts where a fiber branches in the middle are defined as fiber intersections (for example Figure 4 When two or more fibers shown in the image are seen to be in contact with each other in the entire or a portion of the image capture area in the longitudinal direction to form a fiber bundle, these fibers are also defined as fiber intersections (e.g. Figure 4The enclosed portion of the figure marked D5). For example, in the case where there are four fibers arranged without gaps in the observed image, the number of fiber intersections is defined as 3. In addition, in terms of the characteristics of the fiber layer, there is a depth due to the thickness of the fiber layer between the side close to the detector (the surface side in the thickness direction of the specimen) and the side away from the detector (the sample stage side in the thickness direction of the specimen) in the SEM observation. Therefore, even if the fibers appear to be crossed in the observed image, the fibers are not in contact with each other. As described above, when the image itself is magnified 3 times (300%) using a 410mm×260mm monitor, multiple fibers that are focused within a range where the width of the boundary line of the fiber shape does not exceed 1mm are considered to have the same positional relationship in the thickness direction (depth) of the specimen. The intersections of the fibers selected in this way are considered to be fiber intersections in accordance with the above definition.

[0146] (Welding point of fiber intersection)

[0147] Among the intersection points defined in the above manner, (i) the portion where the boundary line of two or more fibers associated with the intersection point cannot be clearly identified (e.g. Figure 4 and (ii) one or more fibers associated with the intersection, the width between the boundaries of the fibers at the intersection is greater than the width between the boundaries outside the intersection (e.g. Figure 4 In addition, when the sheets are stacked, the fiber layers are peeled off and the fiber layer to be measured is taken out to perform the above operation.

[0148] The laminated fiber sheet 10 preferably has an inner sheet 1 and an outer sheet 2 that are integral and have high strength. This integral strength is preferably sufficient to withstand the aforementioned stretching. This strength is expressed as breaking strength. Considering its relationship with the aforementioned stretching and the inner sheet 1's resistance to friction and rupture during stretching, this breaking strength preferably falls within the following ranges in the two directions X and Y representing the aforementioned elongation.

[0149] The breaking strength in the Y direction is preferably 1 N / 20 mm or more, more preferably 2 N / 20 mm or more, and even more preferably 2.5 N / 20 mm or more, from the viewpoint of obtaining resistance to elongation.

[0150] From the viewpoint of facilitating the transport of the laminated fiber sheet 10 , the breaking strength in the X direction is preferably 1 N / 20 mm or more, more preferably 3 N / 20 mm or more, and even more preferably 5 N / 20 mm or more.

[0151] (Method for measuring breaking strength of laminated fiber sheet 10)

[0152] The breaking strength of the laminated fiber sheet 10 was determined by fixing a 20 mm wide and 70 mm long test piece with a gripping interval of 50 mm and extending it at a rate of 300 mm / min. The maximum load until breaking occurred was defined as the breaking strength. The measurement temperature was 23°C.

[0153] In the laminated fiber sheet 10, from the viewpoint of improving the integrity, it is preferable that the fibers of both the inner sheet 1 and the outer sheet 2 are fused to each other at the interface (for example, Figure 5 Furthermore, from the viewpoint of suppressing excessive rigidity of the laminated fiber sheet 10, it is preferred that both fibers at the interface be bonded at the fusion point where the fibers intersect, while maintaining their fiber shapes.

[0154] The above-mentioned welding means that the resin components contained in the inner sheet 1 and the outer sheet 2 are melted and joined due to heat (thermal welding, etc.). Because the inner sheet 1 and the outer sheet 2 contain the same type of materials with high compatibility as mentioned above, the welding at the interface is more solid. In this way, the integrity of the inner sheet 1 and the outer sheet 2 can be further improved while maintaining the softness of one side 10T of the inner sheet 1 itself and the close contact with the skin surface. In particular, when the laminated fiber sheet 10 is performing expansion and contraction behavior, the peeling at the interface between the inner sheet 1 and the outer sheet 2 can be more effectively suppressed, making the tracking of the two layers better (for example, from Figure 5 (A) to (B)). This allows for more reliable mobility of the liquid from the outer sheet 2 to the inner sheet 1. Furthermore, by integrating the inner sheet 1 and the outer sheet 2 at the fusion point where the fibers intersect, the interfiber spaces at the interface between the two sheets can be easily maintained, allowing for more reliable and smoother liquid mobility. Furthermore, by further improving the integrity, the aforementioned operability of the laminated fiber sheet 10 can be further improved.

[0155] From the viewpoint of further enhancing the above-mentioned effects, the weld strength at the interface is preferably 0.01 N / 20 mm or more, more preferably 0.1 N / 20 mm or more, and even more preferably 0.2 N / 20 mm or more.

[0156] Furthermore, the actual weld strength at the interface is less than 10 N / 20 mm.

[0157] When it is within the above range, the laminated fiber sheets 10 are integrated.

[0158] (Method for measuring weld strength at the interface between the inner sheet 1 and the outer sheet 2)

[0159] Measure as follows.

[0160] An adhesive tape is attached to the surface of the inner sheet 1 of the laminated fiber sheet 10, and the tape is subjected to T-peeling using a tensile testing machine. This allows the strength of the fusion bonds between the fibers of the inner sheet 1 and the outer sheet 2 at the interface between them to be measured. The greater the number of fusion points at the interface between the inner sheet 1 and the outer sheet 2, the greater the resistance during T-peeling.

[0161] An adhesive tape (adhesive strength: 4.4 N / 10 mm) was attached to the surface of the inner sheet 1, and a test piece 20 mm wide and 100 mm long was prepared. The tape end in the longitudinal direction was peeled off, and the tape end and the laminated fiber sheet 10 were stretched with a gripping distance of 50 mm and a pulling speed of 100 mm / min. The test force at the time of peeling the tape from the laminated fiber sheet 10 was measured. Of the test forces obtained, the average value of the test forces obtained when the gripping tool moved a distance of at least 30 mm and within 80 mm from the initial position was defined as the weld strength, i.e., the weld strength.

[0162] The weld points at the fiber intersections in the inner sheet 1 and the weld points between the fibers at the interface between the inner sheet 1 and the outer sheet 2 can be easily formed by making the inner sheet 1 and the outer sheet 2 contain the same material. The weld points can be formed as follows.

[0163] On the surface of the outer sheet 2, a resin solution or molten resin made of the same material as described above is discharged from a nozzle using, for example, an electrospinning method. The spun fibers (the constituent fibers of the inner sheet 1) formed by the discharge are captured on the outer sheet 2 while being hot and fluid. This allows the spun fibers to be captured while fused at their intersections, integrating the spun fibers with the fibers of the outer sheet 2 while still fused. By capturing such spun fibers, an inner sheet 1 is obtained that forms a network of fusion points at the intersections of the fibers. At the same time, fusion points between the fibers of the inner sheet 1 and the outer sheet 2 are formed at the interface between them. The temperature at which the spun fibers are rendered fluid is appropriately set depending on the resin raw material used. For example, when a low-crystalline PP resin is used as the resin raw material for the inner sheet 1, the spun fibers are preferably captured within a temperature range of 40°C to 70°C, which is the temperature at which they transition to a rubbery state. Furthermore, it is preferable to heat and maintain the outer sheet 2, which serves as the capture and receiving tray, at this temperature.

[0164] In addition to the above methods, heat sealing can also be used to form the above-mentioned fusion points. From the perspective of preventing thermal shrinkage of the fiber elastic body and the formation of a film due to melting of the resin, as mentioned above, it is more preferable to perform fusion during spinning when the time and number of times of exposure to heat are short.

[0165] Next, a method of using the laminated fiber sheet 10 of the present invention will be described below.

[0166] In the method of using the laminated fiber sheet 10 , the laminated fiber sheet 10 is moistened with the liquid substance.

[0167] Specifically, the process includes the steps of applying the laminated fiber sheet 10 with the inner sheet 1 facing the object and applying the liquid substance.

[0168] The laminated fiber sheet 10 preferably exhibits mobility of the liquid substance from the outer sheet 2 to the inner sheet 1 through the above two steps.

[0169] Specifically, the two steps described above can be performed in any order of (I) to (III) below. Regardless of the order, the laminated fiber sheet 10 exhibits the mobility of the liquid from the outer sheet 2 to the inner sheet 1, creating a wet state with the liquid on the inner sheet 1 (particularly the surface of the inner sheet 1 facing the object). This allows the outer sheet 2 to be dried. In the step of applying the liquid, the amount of liquid applied is preferably within the range indicated in the "amount of liquid applied to create a wet state" above.

[0170] (I) After applying the liquid substance to the object, the laminated fiber sheet 10 is applied to the object with the inner sheet 1 facing the object.

[0171] (II) After applying the liquid substance to the laminated fiber sheet 10 , the laminated fiber sheet 10 is applied to the object with the inner sheet 1 facing the object.

[0172] (III) After the laminated fiber sheet 10 is applied to the object with the inner sheet 1 facing the object, the above-mentioned liquid substance is applied to the laminated fiber sheet 10 .

[0173] The above-mentioned display of the mobility of the liquid from the outer sheet 2 to the inner sheet 1 is not limited to moving the liquid in the outer sheet 2 to the inner sheet 1, but also includes: the liquid that is about to flow back from the inner sheet 1 to the outer sheet 2, or the liquid that has already flowed back to the inner sheet 1. In addition, Figure 6 This diagram schematically illustrates an example of the migration of a liquid material when a laminated fiber sheet 10 is applied to an object W. Arrows F1, F2, and F3 only indicate the approximate direction of the liquid material's movement; the actual movement pattern of the liquid material can be more complex. For ease of explanation, the directions of the liquid material's movement indicated by arrows F1, F2, and F3 are shown in different locations and sequences. However, in reality, the movement of the liquid material can occur in the same location and sequence, and the timing is not limited to the same time; it can also occur at different times.

[0174] In the above-mentioned sequence (I), before the laminated fiber sheet 10 is applied in a manner such that the inner sheet 1 faces the above-mentioned object, the above-mentioned liquid substance is first applied to the above-mentioned object. The method of applying the above-mentioned liquid substance to the above-mentioned object can be implemented by various commonly used methods such as spraying. In this case, the above-mentioned liquid substance initially exists at the interface between the inner sheet 1 and the above-mentioned object. At this time, the inner sheet 1 absorbs the above-mentioned liquid substance by its own extremely strong capillary force. Because the inner sheet 1 and the outer sheet 2 are integrated, and the inner sheet 1 is an extremely thin layer formed by the above-mentioned ultrafine fibers, the above-mentioned liquid substance can gradually move to the outer sheet 2. However, in this wet state, the laminated fiber sheet 10, in addition to utilizing the above-mentioned capillary force, also utilizes the high liquid retention capacity brought by the above-mentioned ultrafine fibers of the inner sheet 1 to play the role of pushing the above-mentioned liquid substance moving from the inner sheet 1 to the outer sheet 2 back to the inner sheet 1 (for example Figure 6 As a result, the liquid substance is retained in the inner sheet 1.

[0175] In the above-mentioned sequence (II), the laminated fiber sheet 10 is pre-applied with the above-mentioned liquid substance and is in a wet state. The detailed application of the above-mentioned liquid substance can be exemplified by methods such as immersing the laminated fiber sheet 10 in a solution of the above-mentioned liquid substance, or applying the liquid substance by spraying or other coating methods. At this time, the application object of the above-mentioned liquid substance may be both the inner sheet 1 and the outer sheet 2 of the laminated fiber sheet 10, or may be either one of them. In either case, the laminated fiber sheet 10 in a wet state not only utilizes the above-mentioned capillary force, but also utilizes the high liquid retention capacity of the inner sheet 1 caused by the above-mentioned ultrafine fibers, so that the above-mentioned liquid substance moves from the outer sheet 2 to the extremely thin inner sheet 1 (for example, Figure 6 The arrow F2 in the middle) allows the liquid to remain in the inner sheet 1.

[0176] In the above-mentioned procedure (III), the above-mentioned liquid substance is used for the laminated fiber sheet 10 applied to the above-mentioned object.

[0177] More specifically, the laminated fiber sheet 10 is placed in contact with the object with the surface side (one surface side 10T) of the inner sheet 1, and the liquid is applied from the surface side (the other surface side 10B) of the outer sheet 2. In this case, the laminated fiber sheet 10 utilizes the high liquid retention capacity of the inner sheet 1 due to the ultrafine fibers in addition to the capillary force, so that the liquid that has penetrated from the outside moves to the inner sheet 1 (for example, Figure 6 As shown in the arrow F3 in the figure, the liquid substance is retained in the inner sheet 1.

[0178] As described above, even if the above two steps (I) to (III) are performed in any order, the laminated fiber sheet 10 forms a uniform liquid film (uniformly wet state) of the liquid on the inner sheet 1 through the synergistic effect of the outer sheet 2 and the inner sheet 1. The adhesion of the liquid to the surface of the object is significantly improved compared to the prior art, and this state can be maintained for a long time. As a result, the liquid can exert its effect on the object uniformly for a long time. As a result, the liquid is biased toward the inner sheet 1, and this state can be easily maintained. In addition, the surface side (the other side 10B) of the outer sheet 2 of the laminated fiber sheet 10 is easily dry and can be easily maintained in this state. In other words, even if the surface side (the other side 10B) of the outer sheet 2 of the laminated fiber sheet 10 comes into contact with, the stickiness caused by the liquid can be suppressed.

[0179] In the method of using the laminated fiber sheet 10, since the inner sheet 1 is extremely thin and contains ultrafine fibers, it is easy to break. Therefore, it is preferable to minimize friction when applying it to an object. From this point of view, it is preferable to apply the liquid after applying the laminated fiber sheet 10 to the object as in the above-mentioned (III), rather than applying the liquid to the object first or applying the laminated fiber sheet 10 to the object after applying the laminated fiber sheet 10 as in the above-mentioned order (I) and (II). In particular, when the laminated fiber sheet 10 is in the form of a glove and is worn on a person's finger, the resistance caused by the liquid can be avoided, allowing smooth wearing, and the liquid can quickly reach the inner sheet 1 when worn. In addition, as described above, because a uniform liquid film is formed on the inner sheet 1, the surface side (the other side 10B) of the outer sheet 2 is dry. Therefore, when the laminated fiber sheet 10 is worn on a person's finger, it is possible to continue operating electronic devices such as smartphones and other daily activities while wearing it.

[0180] In the method of using the laminated fiber sheet 10, as Figure 6 As shown, at the interface between the outer sheet 2 and the inner sheet 1 having different median fiber diameters, it is preferred that: a contact area 21 where the constituent fibers of the outer sheet 2 are in contact with the fiber layer of the inner sheet 1; and a gap area (non-contact area) L where the constituent fibers of the outer sheet 2 do not contact the fiber layer of the inner sheet 1. As a result, it is possible to better present the mobility of the above-mentioned liquid from the outer sheet 2 to the inner sheet 1, form a uniform liquid film of the liquid on the inner sheet 1, and achieve a dry state of the outer sheet 2. In addition, the inner sheet 1 and the outer sheet 2 are combined at the fusion point of the fiber intersection as described above, which can obtain a certain strength, will not float at the interface, and can more easily manifest capillary force. Therefore, it is easier to generate a uniform wet state in the inner sheet 1, and the liquid retention is further improved.

[0181] The method for using the laminated fiber sheet 10 may also include the step of reapplying the previously applied liquid from the surface of the outer sheet 2 of the laminated fiber sheet 10. Specifically, the liquid can be reapplied while the laminated fiber sheet 10 is applied to the object. In this case, in addition to utilizing the capillary force, the high liquid retention capacity of the inner sheet 1, provided by the ultrafine fibers, is also utilized to move the liquid toward the inner sheet 1, thereby allowing the outer sheet 2 to dry. Therefore, this step can be repeated multiple times.

[0182] During the method of using the laminated fiber sheet 10, even when the laminated fiber sheet 10 contains the liquid, the fibers constituting the laminated fiber sheet 10 preferably maintain their fiber shape. This can be achieved by making the inner sheet 1 and outer sheet 2 insoluble in the liquid, as described above. This makes it possible to more effectively enhance the effect of the fiber structure of the laminated fiber sheet 10 on the liquid and the tendency of the liquid to be preferentially disposed toward the inner sheet 1. Furthermore, the aforementioned reuse of the liquid can be performed more effectively. Furthermore, the handleability of the laminated fiber sheet 10 can be improved.

[0183] In the method for using the laminated fiber sheet 10, the proportion of the gram weight of the liquid material in the gram weight of the laminated fiber sheet 10 is preferably 50% or greater. This facilitates the formation of a uniform film of the liquid material, improves the mobility of the liquid material from the outer sheet 2 to the inner sheet 1, forms a uniform liquid film of the liquid material on the inner sheet 1, and maintains a dry state of the outer sheet 2.

[0184] (Method for measuring the ratio of the basis weight of the liquid substance to the basis weight of the laminated fiber sheet)

[0185] (1) The mass of the laminated fiber sheet before application of the liquid material was measured.

[0186] (2) The mass of the laminated fiber sheet containing the liquid material after the liquid material is applied is measured.

[0187] (3) The basis weight of the liquid material is calculated based on the difference between (2) and (1) above, and the ratio thereof to the basis weight of the laminated fiber sheet before application of the liquid material in (1) above is calculated.

[0188] The laminated fiber sheet 10 can be used in various articles and shapes. For example, the laminated fiber sheet 10 can be used as a wound dressing or bandage for contact with the skin. Furthermore, the laminated fiber sheet 10 can be shaped like a tube or glove. Examples of such tubes include protective gear and finger cots.

[0189] Such articles preferably have unidirectional stretchability. That is, the laminated fiber sheet 10 is preferably applied to the above-mentioned articles in a manner that the laminated fiber sheet 10 stretches along a direction Y in the laminated fiber sheet 10 .

[0190] The "unidirectional stretchability" mentioned above refers to the direction in which the difference in elongation between two mutually orthogonal directions is 20% or greater, as measured by applying a load of 1.2 N to the sample according to the aforementioned (elongation measurement method). In the laminated fiber sheet 10, the two mutually orthogonal directions are the one direction Y and the direction X orthogonal to the one direction Y.

[0191] Example

[0192] The present invention is described in more detail below based on the following examples, but the present invention is not to be construed as being limiting. In addition, in these examples, "parts" and "%" representing mass are based on mass unless otherwise specified. "←" indicates the same content as in the left column. "-" indicates that there is no corresponding value for the item.

[0193] (Example 1)

[0194] The outer sheet 2 having the median fiber diameter and basis weight shown in Table 1 was formed by a spunbond method using the resin raw material PP.

[0195] A resin melt was prepared using the resin raw material PP and spun using the electrospinning method. At this point, heated air jetted from around the spinning nozzle heated the space between the spinning nozzle and the collection device to above 40°C, allowing the spun fibers to be collected on the outer sheet 2 in a fluid state. The distance between the nozzle and the collection device was set to 300 mm. This produced an inner sheet 1 having the median fiber diameter and basis weight shown in Table 1, yielding a laminated fiber sheet sample consisting of the inner sheet 1 and the outer sheet 2.

[0196] (Comparative Example 1)

[0197] The outer sheet 2 produced in Example 1 was used alone as a fiber sheet sample in Comparative Example 1.

[0198] (Comparative Example 2)

[0199] The inner sheet 1 produced in Example 1 was used alone as a fiber sheet sample in Comparative Example 2.

[0200] The following tests were performed on the samples of each example and each comparative example.

[0201] (1) The liquid in the laminated fiber sheet sample of Example 1 is continuously biased, the inner side is wet, and the outer side is dry (preventing stuffiness).

[0202] The following steps (1-1) to (1-4) were followed. The results are shown in Table 2.

[0203] (1-1) 0.15 g of a liquid (Curel Beauty Serum Ma, manufactured by Kao Corporation, manufactured in 2022) was applied to a 50 mm square laminated fiber sheet sample of Example 1 from the outer sheet 2 side.

[0204] (1-2) The laminated fiber sheet sample after coating was allowed to stand and was collected after the time period described in Table 2 had passed since coating.

[0205] (1-3) The inner sheet 1 and outer sheet 2 of the recovered laminated fiber sheet sample were separated, and their respective masses were measured. The mass of the liquid material contained was calculated based on the difference between the mass of the sheet and the mass before the liquid material was applied. Because it was not possible to separate the inner sheet 1 and outer sheet 2 before the liquid material was applied to measure the sheet mass, a converted value calculated from the grammage was used.

[0206] (1-4) The ratio (mass ratio) is calculated by dividing the mass of the liquid substance contained in the inner sheet 1 by the mass of the inner sheet 1 before the liquid substance is applied. The mass ratio is similarly calculated for the outer sheet 2. A state where the mass ratio is 1.5 or less is considered a dry state, and a state where the mass ratio exceeds 1.5 is considered a non-dry state (wet state).

[0207] (2) Persistence of moist state

[0208] The mass ratios of the fiber sheet samples of Comparative Examples 1 and 2 were calculated by following the procedures (2-1) to (2-5). The results are shown in Table 3 along with the mass ratios of Example 1. The mass ratios of Example 1 in Table 3 use the values ​​in Table 2.

[0209] (2-1) Cut a 50 mm square piece and measure the mass of the piece before applying the liquid.

[0210] (2-2) 0.15 g of a liquid (Curel Beauty Essence Ma, manufactured by Kao Corporation, manufactured in 2022) was applied to a 50 mm square sheet from one side.

[0211] (2-3) The coated sheet was allowed to stand and then collected after the time period described in Table 3 had passed since the coating.

[0212] (2-4) The respective masses are measured, and the contained mass of the liquid material is calculated from the difference with the mass of the sheet before application of the liquid material.

[0213] (2-5) The ratio of the contained mass of the liquid material divided by the mass of the sheet before application of the liquid material is calculated.

[0214] (3) Suppressing external viscosity

[0215] In order to confirm whether it is possible to achieve both a wet state on the inside and a suppressed stickiness on the outside, the following steps (3-1) to (3-6) were carried out. The results of (3-5) and (3-6) are shown in Table 3.

[0216] (3-1) Measure the mass of the filter paper before transfer.

[0217] (3-2) 0.15 g of a liquid (Curel Beauty Essence Ma, manufactured by Kao Corporation, manufactured in 2022) was applied to one side of a 50 mm square sheet.

[0218] ※ In the laminated fiber sheet sample of Example 1, the liquid material was applied from the outer sheet 2 side.

[0219] (3-3) The coated sheet was allowed to stand and then collected after the time period described in Table 3 had passed since the coating.

[0220] (3-4) The fiber sheet samples of each comparative example were placed so that the surface coated with the liquid material reached the interface with the filter paper, and a load of 1.5 kg was applied from above for 1 minute. The laminated fiber sheet sample of Example 1 was placed so that the surface on the outer sheet 2 side reached the interface with the filter paper, and a load of 1.5 kg was applied from above for 1 minute.

[0221] (3-5) The mass of the filter paper after transfer is measured, and the amount of the liquid transferred is calculated based on the mass difference between the filter paper after transfer and the filter paper before transfer, thereby determining the amount of the liquid transferred from the outside.

[0222] (3-6) In the above (3-1) to (3-5), with respect to (3-4), the fiber sheet samples of each comparative example were placed so that the surface opposite to the surface coated with the liquid reached the interface with the filter paper, while the laminated fiber sheet sample of Example 1 was placed so that the surface on the inner sheet 1 side reached the interface with the filter paper. A load of 1.5 kg was applied, and the calculation of the liquid transfer amount in (3-5) was performed to determine the liquid transfer amount from the inner side.

[0223] [Table 1]

[0224] Table 1

[0225]

[0226] [Table 2]

[0227] Table 2

[0228]

[0229] [Table 3]

[0230] Table 3

[0231]

[0232] Results of (1)

[0233] In Example 1, as shown in Table 2, when the mass ratios of the inner sheet 1 and outer sheet 2 are compared over a period of 10 to 60 minutes, the inner sheet 1 has a larger mass ratio, and the liquid material is biased toward the inner sheet 1. Furthermore, the mass ratio of the inner sheet 1 exceeds 1.5, while the mass ratio of the outer sheet 2 is less than 1.5. Therefore, as defined above, the inner sheet 1 does not dry, while the outer sheet 2 does dry. This indicates that the inner sheet 1 maintains a non-drying state (wet state) for a long period of time, while the outer sheet 2 maintains a dry state. Furthermore, the laminated fiber sheet sample of Example 1 can maintain a wet state for the inner sheet 1 while the fiber layer of the outer sheet 2 remains dry, resulting in excellent air permeability and anti-stuffiness properties.

[0234] Results of (2) and (3)

[0235] In Example 1, the amount of liquid transferred at 10 minutes and 20 minutes was confirmed. At any time, the amount of transfer to the outer sheet 2 was less than that to the inner sheet 1. In addition, regarding the outer sheet 2, the amount of liquid transferred at the time of the mass ratio of 1.4, which was determined to be dry, was less than that to the inner sheet 1. Figure 7 On the other hand, regarding the inner sheet 1, the mass ratio of 2.24 when it is judged to be not dry is less than that of (A). Figure 7 (B) shows a large transfer amount. As described above, it can be seen that when the outer sheet 2 is judged to be dry, the outer side can be prevented from becoming sticky. Furthermore, in Example 1, the inner sheet 1 adjacent to the dry outer sheet 2 is moist, and the transfer amount is also greater, indicating that the liquid substance is more likely to act on the object.

[0236] Compared to Comparative Example 1, Example 1 maintains a moist inner surface, as shown by the transfer amount after 10 and 20 minutes. Compared to Comparative Example 2, Example 1 suppresses stickiness on the outer surface, as shown by the transfer amount after 10 and 20 minutes. This demonstrates that the structure of Example 1 achieves both suppressing stickiness on the outer surface and maintaining a moist inner surface.

[0237] The present invention has been described based on its embodiments and examples. However, unless otherwise specified, the present invention is not limited to any details described and can be interpreted broadly without departing from the spirit and scope of the invention.

[0238] This application claims priority based on Japanese Patent Application No. 2023-026742 filed in Japan on February 22, 2023, and Japanese Patent Application No. 2023-026743 filed in Japan on February 22, 2023, and refers to their contents, which are incorporated as part of the description of this specification.

[0239] Description of Reference Numerals

[0240] 1: Inner piece

[0241] 2: Outer piece

[0242] 10: Laminated fiber sheets.

Claims

1. A method for using a laminated fiber sheet, comprising wetting a laminated fiber sheet having an inner sheet laminated on one surface of an outer sheet with a liquid substance, The method for using the laminated fiber sheet is characterized by: Regarding the laminated fiber sheet, The inner sheet and the outer sheet are insoluble in liquid substances. The median fiber diameter of the inner sheet is 0.3 μm or more and 5 μm or less. The median fiber diameter of the outer sheet is greater than the median fiber diameter of the inner sheet, The inner sheet is integrated with the outer sheet. The method for using the laminated fiber sheet comprises: a step of applying the laminated fiber sheet with the inner sheet facing the object; and The step of applying the liquid.

2. The method for using the laminated fiber sheet according to claim 1, wherein: The laminated fiber sheet exhibits mobility of the liquid substance from the outer sheet to the inner sheet through the two steps.

3. The method for using the laminated fiber sheet according to claim 1 or 2, wherein: The liquid material is applied from the surface side of the outer sheet in a state where the surface side of the inner sheet is in contact with the object.

4. The method for using the laminated fiber sheet according to claim 1 or 2, wherein: After applying the liquid substance to the object, the laminated fiber sheet is applied with the inner sheet facing the object.

5. The method for using the laminated fiber sheet according to claim 1 or 2, wherein: After applying the liquid substance to the laminated fiber sheet, the laminated fiber sheet is applied so that the inner sheet faces the object.

6. The method for using the laminated fiber sheet according to any one of claims 1 to 5, wherein: The outer sheet contains fibers having a median fiber diameter of 5 μm to 50 μm, preferably 10 μm to 30 μm, and more preferably 15 μm to 25 μm.

7. The method for using the laminated fiber sheet according to any one of claims 1 to 6, wherein: The weight of the inner sheet is 1g / m 2 Above and 8g / m 2 Below, preferably 1.5g / m 2 Above and 6g / m 2 Below, more preferably 2g / m 2 Above and 5g / m 2 the following.

8. The method for using the laminated fiber sheet according to any one of claims 1 to 7, wherein: In the laminated fiber sheet, the weight of the outer sheet is 8g / m 2 Above and 50g / m 2 Below, preferably 15g / m 2 Above and 40g / m 2 Below, more preferably 17g / m 2 Above and 30g / m 2 the following.

9. The method for using the laminated fiber sheet according to any one of claims 1 to 8, wherein: The laminated fiber sheet has stretchability.

10. The method for using the laminated fiber sheet according to any one of claims 1 to 9, wherein: The laminated fiber sheet has an elongation of 20% to 100% in one direction among planar directions, and an elongation of 0% to 30% in a direction perpendicular to the one direction.

11. The method for using the laminated fiber sheet according to any one of claims 1 to 10, wherein: The liquid substance is contained in an amount of 50% or more of the gram weight of the laminated fiber sheet.

12. The method for using the laminated fiber sheet according to any one of claims 1 to 11, wherein: The method further includes applying the liquid material again from the surface side of the outer sheet of the laminated fiber sheet.

13. The method for using the laminated fiber sheet according to any one of claims 1 to 12, wherein: The liquid substance is biased toward the inner sheet.

14. The method for using the laminated fiber sheet according to any one of claims 1 to 13, wherein: The surface side of the outer sheet in the laminated fiber sheet is in a dry state.

15. The method for using the laminated fiber sheet according to any one of claims 1 to 14, wherein: The thickness of the inner sheet is 3 μm or more and 50 μm or less, preferably 4 μm or more and 40 μm or less, and more preferably 5 μm or more and 30 μm or less.

16. The method for using the laminated fiber sheet according to any one of claims 1 to 15, wherein: In the step of applying the liquid, the amount of the liquid applied is 0.2 mg / cm 2 Above and 10mg / cm 2 Below, preferably 0.3 mg / cm 2 Above 7mg / cm 2 Less than, more preferably 0.4 mg / cm 2 Above and 5mg / cm 2 Below, particularly preferably 0.4 mg / cm 2 Above 4 mg / cm 2 the following.

17. The method for using the laminated fiber sheet according to any one of claims 1 to 16, wherein: The weld strength at the interface between the integrated inner sheet and the outer sheet is 0.01 N / 20 mm to 10 N / 20 mm, preferably 0.1 N / 20 mm to 10 N / 20 mm, and more preferably 0.2 N / 20 mm to 10 N / 20 mm.

18. The method for using the laminated fiber sheet according to any one of claims 1 to 17, wherein: The liquid material contains a polyol that is liquid at 20° C., and preferably contains one or more selected from ethylene glycol, propylene glycol, 1,3-butylene glycol, dipropylene glycol, polyethylene glycol having a mass average molecular weight of 2000 or less, glycerol, and diglycerol.

19. The method for using the laminated fiber sheet according to any one of claims 1 to 18, wherein: Even if the laminated fiber sheet contains the liquid substance, the fibers constituting the laminated fiber sheet maintain their fiber shapes.

20. The method for using the laminated fiber sheet according to any one of claims 1 to 19, wherein: The laminated fiber sheet is in the shape of a wound dressing, a bandage, a tube or a glove.

21. A laminated fiber sheet comprising an inner sheet laminated on one surface of an outer sheet, The laminated fiber sheet is characterized by: The inner sheet and the outer sheet are insoluble in liquid substances. The median fiber diameter of the inner sheet is 0.3 μm or more and 5 μm or less, and the median fiber diameter of the outer sheet is larger than the median fiber diameter of the inner sheet. The inner sheet is integrated with the outer sheet. The laminated fiber sheet contains a liquid substance, and the liquid substance is concentrated on the inner sheet.

22. The laminated fiber sheet according to claim 21, wherein: Due to the bias of the liquid substance, the surface side of the outer sheet is in a dry state.

23. The laminated fiber sheet according to claim 21 or 22, wherein: The outer sheet contains fibers having a median fiber diameter of 5 μm to 50 μm, preferably 10 μm to 30 μm, and more preferably 15 μm to 25 μm.

24. The laminated fiber sheet according to any one of claims 21 to 23, wherein: The weight of the inner sheet is 1g / m 2 Above and 8g / m 2 Below, preferably 1.5g / m 2 Above and 6g / m 2 Below, more preferably 2g / m 2 Above and 5g / m 2 the following.

25. The laminated fiber sheet according to any one of claims 21 to 24, wherein: The outer sheet has a gram weight of 8 g / m 2 Above and 50g / m 2 Below, preferably 15g / m 2 Above and 40g / m 2 Below, more preferably 17g / m 2 Above and 30g / m 2 the following.

26. The laminated fiber sheet according to any one of claims 21 to 25, wherein: The inner sheet is adjacent to the outer sheet and is integrated by fusing fibers constituting the inner sheet and fibers constituting the outer sheet.

27. The laminated fiber sheet according to any one of claims 21 to 26, wherein: The inner sheet and the outer sheet contain the same type of material, and the same type of material is selected from olefin resins, diene resins, polyurethane resins and copolymers thereof.

28. The laminated fiber sheet according to claim 27, wherein: The same type of material is an olefin resin, The inner sheet contains a low-crystalline olefin resin.

29. The laminated fiber sheet according to any one of claims 21 to 28, wherein: The laminated fiber sheet has an elongation of 20% to 100% in one direction among planar directions, and an elongation of 0% to 30% in a direction perpendicular to the one direction.

30. The laminated fiber sheet according to any one of claims 21 to 29, wherein: The laminated fiber sheet is in the shape of a wound dressing, a bandage, a tube or a glove.

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