Multilayer sheet

Abstract

To provide a multilayer sheet that is thin and has a desired water absorption capacity with changes in thickness before and after water absorption being small.SOLUTION: A multilayer sheet of the present invention is a multilayer sheet having a liquid-permeable layer and a water-absorbing layer, and is characterized in that the thickness of the multilayer sheet is 3 mm or less, the liquid return amount is 2.2 g or less, and the water absorption amount is 580 g / m2 to 2,000 g / m2.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a multilayer sheet. [Background technology]

[0002] Floor sheets are used in hand washing areas, various wet areas, examination rooms, and during surgery in medical settings to prevent floors from becoming contaminated with cleaning water, blood, bodily fluids, and chemical solutions. These floor sheets are used not only to prevent floor stains, but also to prevent contamination of medical staff and equipment, as well as to prevent falls caused by water droplets splashed onto the floor.

[0003] For example, Patent Document 1 discloses a multilayer sheet in which a long-fiber nonwoven fabric layer, a water-absorbent short-fiber nonwoven fabric layer, and a waterproof layer are laminated in this order. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-232707 Summary of the Invention [Problem to be solved by the invention]

[0005] Floor sheets used in medical settings are required to absorb splashed liquids, prevent the liquid from returning once absorbed, and provide a dry feeling after absorption. The thickness of the floor sheet itself is also important. If the floor sheet is too thick, a step will be created between the sheet and the floor, making it difficult for hand trucks or carts to pass through. Conventional floor sheets have insufficient water absorption performance, leaving room for improvement. The present invention was made in consideration of the above circumstances, and aims to provide a multilayer sheet that is thin, has the desired water absorption capacity, and exhibits little change in thickness before and after water absorption. [Means for solving the problem]

[0006] The multilayer sheet of the present invention is a multilayer sheet having a liquid-permeable layer and a water-absorbent layer, and has a thickness of 3 mm or less, a liquid return amount of 2.2 g or less, and a water absorption amount of 580 g / m 2 ~2,000g / m 2 It is characterized in that: [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a thin sheet that has the desired water absorption performance and exhibits only a small change in thickness before and after water absorption. Furthermore, the multilayer sheet of the present invention also provides an excellent dry feeling after water absorption. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an explanatory diagram schematically illustrating an example of a multilayer sheet according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] The multilayer sheet of the present invention is a multilayer sheet having a liquid-permeable layer and a water-absorbent layer, and has a thickness of 3 mm or less, a liquid return amount of 2.2 g or less, and a water absorption amount of 580 g / m 2 ~2,000g / m 2 It is characterized in that:

[0010] The multilayer sheet of the present invention is a multilayer sheet in which a liquid-permeable layer and a water-absorbent layer are laminated. The thickness of the multilayer sheet is 3 mm or less, preferably 2.8 mm or less, and more preferably 2.5 mm or less. A thickness of more than 3 mm is undesirable because it increases the step between the sheet and the floor when used as a floor sheet. The lower limit of the thickness of the multilayer sheet of the present invention is not particularly limited, but is preferably 0.1 mm, more preferably 0.2 mm, and even more preferably 0.3 mm. When the multilayer sheet of the present invention has a waterproof layer described below, it is preferable that the multilayer sheet in which the liquid-permeable layer, water-absorbent layer, and waterproof layer are laminated satisfies the above thickness range.

[0011] The liquid-permeable layer of the multilayer sheet of the present invention will now be described. The liquid-permeable layer is not particularly limited as long as it is a liquid-permeable sheet.

[0012] The liquid permeation rate of the liquid-permeable layer is preferably 6 seconds or less, and more preferably 5 seconds or less. If the liquid permeation rate of the liquid-permeable layer exceeds 6 seconds, the water absorption rate of the multilayer sheet decreases. As a result, water droplets and the like tend to remain on the multilayer sheet, which may cause the sheet to tip over.

[0013] The liquid-permeable layer preferably has openings, for example, so that water droplets and the like can easily pass through the liquid-permeable layer through the openings.

[0014] The shape of the openings is not particularly limited, but examples thereof include circles, ellipses, polygons such as triangles, rectangles, pentagons, and hexagons, and irregular shapes. The openings in the liquid-permeable layer may have one type of shape or two or more types of shapes. The shape of the openings in the liquid-permeable layer is preferably circles.

[0015] The size of the opening is not particularly limited, but for example, the minimum circumscribing circle diameter (diameter) of the opening is preferably 1.2 mm or less, more preferably 1.1 mm or less, and even more preferably 1.0 mm or less. If the minimum circumscribing circle diameter of the opening is too large, the surface strength of the multilayer sheet may decrease, making it more susceptible to breakage. The lower limit of the minimum circumscribing circle diameter of the opening is not particularly limited, but is preferably 0.1 mm, more preferably 0.15 mm, and even more preferably 0.2 mm. The minimum circumscribing circle diameter of the opening is determined based on the unit area (1 cm 2 ) is preferably the number average diameter of the smallest circumscribing circle diameter of the openings per

[0016] The opening ratio of the liquid-permeable layer is preferably 20% or more, more preferably 22% or more, even more preferably 24% or more, and is preferably 75% or less, more preferably 65% ​​or less, and even more preferably 55% or less. When the opening ratio of the liquid-permeable layer is within the above range, the absorption rate of the multilayer sheet is increased. The opening ratio is determined by the unit area (1 cm 2) expressed as a percentage.

[0017] The liquid-permeable layer is preferably a liquid-permeable sheet and / or a liquid-permeable film, and more preferably a liquid-permeable sheet and / or a liquid-permeable film having openings. The material constituting the sheet and / or film is not particularly limited, but examples thereof include hydroxycarboxylic acid polyesters having 1 to 6 carbon atoms, such as polylactic acid, polyglycolic acid, and polyhydroxybutyrate; aliphatic polyesters, such as polycaprolactone, polyethylene adipate, and polybutylene succinate; semi-aromatic polyesters, such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polytrimethylene terephthalate (PTT), and polybutylene terephthalate (PBT); aromatic polyesters, such as polyarylate; acrylic resins; vinylidene (vinyl chloride or vinylidene chloride copolymers); polyamides, such as aramid and nylon, and polyolefins, such as polyethylene and polypropylene; polyurethanes; polyvinyl compounds, such as ethylene vinyl alcohol, polyvinyl chloride, and polyvinyl alcohol; and polyparaphenylenebenzoxazole (PBO), acetate, triacetate, and cellophane.

[0018] In the present invention, it is preferable to use a polyolefin sheet and / or polyolefin film having openings as the liquid-permeable layer, and it is more preferable to use a polyethylene sheet and / or polyethylene film having openings.

[0019] "Sheet" and "film" are thin, flat objects whose thickness is generally small relative to their length and width. For example, in the narrow sense, a thickness of 100 μm or more is called a sheet, and a thickness of less than 100 μm is sometimes called a film. However, the boundary between a sheet and a film is not clear, and unless a distinction is made between the two in the present invention, the term "sheet" also includes the term "film," and the term "film" also includes the term "sheet."

[0020] The water-absorbing layer of the multilayer sheet of the present invention will now be described.

[0021] The water absorption capacity of the water absorption layer is, for example, 600 g / m 2 It is preferable that the weight is 650 g / m or more. 2 More preferably, it is 700 g / m or more. 2 More preferably, it is 2,000 g / m or more. 2 Preferably, it is 1,900 g / m or less. 2 If the water absorption amount of the water absorption layer is within the above range, for example, liquid splashed onto the multilayer sheet can be absorbed, and the sheet can be prevented from tipping over and the spread of contamination.

[0022] It is preferable that the thickness of the water-absorbing layer does not change before and after water absorption. If the thickness increases after water absorption, it is not preferable because the difference in level between the floor and the sheet when used as a floor sheet will become large. From this perspective, it is not preferable to use a water-absorbing resin with a water absorption capacity of 25 g / g or more. Examples of water-absorbing resins with a water absorption capacity of 25 g / g or more include water-absorbing resins used in disposable diapers, urine pads, etc., and specific examples include neutralized cross-linked polymers whose main components are acrylic acid, polysaccharides including starch, amino acids, etc.

[0023] The water absorption layer is preferably a staple fiber nonwoven fabric, and more preferably an air-laid nonwoven fabric. The air-laying method is a method of producing a nonwoven fabric by, for example, conveying staple fibers containing thermally adhesive synthetic fibers while uniformly dispersing them in an air current, blowing the staple fibers out of a screen with fine holes at the discharge section, dropping them onto a metal or plastic net installed below, and depositing the staple fibers on the net while suctioning air below the net. The thermally adhesive synthetic fibers enhance the shape retention of the air-laid nonwoven fabric obtained by bonding the staple fibers.

[0024] In this way, nonwoven fabrics manufactured using the air-laying method can have short fibers randomly oriented in three dimensions in both the width and thickness directions. As a result, air-laid nonwoven fabrics have more voids and can absorb more water. Air-laid nonwoven fabrics also have the advantage of only minor changes in thickness even when they absorb water.

[0025] Short fibers that can be used to form air-laid nonwoven fabrics will now be described. The short fibers are not particularly limited, but examples thereof include synthetic fibers, recycled fibers, semi-synthetic fibers, inorganic fibers, and natural fibers.

[0026] Examples of the synthetic fibers include hydroxycarboxylic acid polyesters having 1 to 6 carbon atoms, such as polylactic acid, polyglycolic acid, and polyhydroxybutyrate; aliphatic polyester fibers, such as polycaprolactone, polyethylene adipate, and polybutylene succinate; semi-aromatic polyester fibers, such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polytrimethylene terephthalate (PTT), and polybutylene terephthalate (PBT); aromatic polyester fibers, such as polyarylate; acrylic fibers; vinylidene fibers (vinyl chloride or vinylidene chloride copolymers); polyamide fibers, such as aramid and nylon; polyolefin fibers, such as polyethylene and polypropylene; polyurethane fibers; fibers made of polyvinyl compounds, such as ethylene vinyl alcohol, polyvinyl chloride, and polyvinyl alcohol; and polyparaphenylenebenzoxazole (PBO) fibers.

[0027] Examples of recycled fibers include rayon polynosic and cupra. Examples of semi-synthetic fibers include acetate, triacetate, and promix. Examples of inorganic fibers include glass fiber, metal fiber, and carbon fiber. Examples of natural fibers include wool, cotton, hemp, and pulp.

[0028] It is also preferable to use thermally adhesive composite fibers as the staple fibers. Examples of the thermally adhesive composite fibers include a core-sheath type in which a low-melting-point component is the sheath component and a high-melting-point component is the core component, and a side-by-side type in which one component is a low-melting-point component and the other a high-melting-point component. Examples of combinations of both components in these composite staple fibers include PP (polypropylene) / PE (polyethylene), PET (polyethylene terephthalate) / PE, PP / low-melting-point copolymerized PP, and PET / low-melting-point copolymerized polyester.

[0029] The melting point of the thermal adhesive component, which is the low-melting component, is preferably 80° C. to 180° C., and more preferably 90° C. to 160° C. If the melting point is less than 80° C., the heat resistance of the fiber is low, which makes it more likely that problems will occur in the manufacturing process, while if the melting point is more than 180° C., it becomes necessary to increase the heat treatment temperature in the manufacturing process of the air-laid nonwoven fabric, which reduces productivity.

[0030] The short fibers preferably have a fiber length of 0.4 mm to 20 mm, more preferably 0.6 mm to 10 mm, and even more preferably 1 mm to 4 mm. If the fiber length is less than 0.4 mm, the effect of increasing strength and rigidity is insufficient, while if it exceeds 20 mm, the fibers tend to become tangled with each other, which can easily cause problems during the manufacturing process.

[0031] The weight of the absorbent layer is 30g / m 2 More than 40g / m 2 More preferably, 50 g / m 2 More preferably, 200 g / m 2 Preferably less than 170 g / m 2 Less than 150 g / m is more preferable. 2 The following is even more preferable: If the basis weight of the water-absorbing layer is within the above range, a good balance between handleability and water absorption capacity is achieved.

[0032] The liquid-permeable layer and the water-absorbent layer of the present invention may be an integrated sheet having a density gradient, such as a multi-layered nonwoven fabric having layers with different fiber thicknesses or densities.

[0033] The multilayer sheet of the present invention preferably further comprises a waterproof layer on the water-absorbing layer side, in which a liquid-permeable layer, a water-absorbing layer, and a waterproof layer are laminated in this order.

[0034] The waterproof layer will be described below. The waterproof layer prevents leakage of liquid absorbed by the multilayer sheet. The waterproof layer is not particularly limited as long as it has waterproof properties, and examples thereof include waterproof sheets and / or waterproof films. Examples of waterproof sheets and / or waterproof films include sheets and / or films made of resin components such as polyolefins such as polyethylene and polypropylene, polyesters, polyamides, polyurethanes, polyvinyl alcohol, ethylene vinyl alcohol, and acetate.

[0035] The thickness of the waterproof layer is not particularly limited, but is preferably 0.01 mm or more, more preferably 0.02 mm or more, and preferably 0.1 mm or less, more preferably 0.09 mm or less. If the waterproof layer is too thin, pinholes and the like may easily occur, and waterproofing may be reduced. Furthermore, if the waterproof layer is too thick, flexibility may be reduced.

[0036] A method for producing the multilayer sheet of the present invention will now be described. The liquid-permeable layer and water-absorbent layer of the multilayer sheet of the present invention can be fixed together, for example, with a hot-melt adhesive. It is also preferable to fix the liquid-permeable layer and water-absorbent layer together by needle punching. For example, a sheet and / or film to be used as the liquid-permeable layer, which has no openings, can be laminated onto the water-absorbent layer, and then needle punching can be used to form openings in the sheet and / or film and to integrate the film and the water-absorbent layer.

[0037] The lamination method for forming the waterproof layer on the water-absorbing layer of the multilayer sheet of the present invention is not particularly limited, and known lamination methods such as thermal lamination, extrusion lamination, dry lamination, and hot-melt lamination may be used.

[0038] A preferred method for laminating the waterproof layer is, for example, extrusion lamination. First, the liquid-permeable layer and the water-absorbent layer are integrated in advance. The resin that constitutes the waterproof layer is melt-kneaded in an extrusion molding machine, extruded into a film form through a T-die, and laminated on the water-absorbent layer side. This method allows the waterproof layer to be integrally laminated onto the preliminary laminate of the liquid-permeable layer and the water-absorbent layer.

[0039] It is also preferable to fix the water-absorbing layer and the waterproof layer of the multilayer sheet of the present invention with, for example, a hot melt adhesive.

[0040] The water absorption capacity of the multilayer sheet of the present invention is, for example, 580 g / m 2 It is preferable that the weight is 620 g / m or more. 2 More preferably, it is 700 g / m or more. 2 More preferably, it is 2000 g / m or more. 2 Preferably, it is 1900 g / m or less. 2 If the water absorption capacity of the multilayer sheet is within the above range, for example, the multilayer sheet can absorb liquid that splashes onto the sheet, thereby preventing the sheet from tipping over and the spread of contamination.

[0041] The amount of liquid return of the multilayer sheet of the present invention is preferably 2.2 g or less, and more preferably 2 g or less. By reducing the amount of liquid return, it is possible to prevent tipping over due to water droplets that have returned. The amount of liquid return is not particularly limited, but is preferably 0 g.

[0042] The multilayer sheet of the present invention preferably has a surface dryness value of 40% or more, more preferably 45% or more, and even more preferably 50% or more, because when the surface dryness value of the multilayer sheet is within this range, liquid does not seep out from the water-absorbed portions, making it less likely for contamination to spread.

[0043] The change in thickness of the multilayer sheet of the present invention before and after water absorption is preferably 10% or less, more preferably 5% or less, even more preferably 3% or less, and particularly preferably 0%. If the thickness after water absorption becomes larger than the thickness before water absorption, the difference in level becomes large, which may cause the sheet to tip over. The thickness change rate is expressed by the following formula: Thickness change rate = (thickness after water absorption - thickness before water absorption) / thickness before water absorption x 100

[0044] Figure 1 is an explanatory diagram schematically illustrating an example of the multilayer sheet of the present invention. The multilayer sheet 1 has a liquid-permeable layer 3, a water-absorbent layer 5, and a waterproof layer 7. The water-absorbent layer 5 is located between the permeable layer 3 and the waterproof layer 7. The liquid-permeable layer 3 has openings 9. When the multilayer sheet of the present invention is used as a floor sheet, it is used with the permeable layer 3 side facing up. [Example]

[0045] The present invention will be described in detail below with reference to examples. However, the present invention is not limited to the following examples, and all modifications and embodiments that do not deviate from the spirit of the present invention are included within the scope of the present invention.

[0046] [Measurement method] (1) Water absorption amount A 5 cm x 5 cm sample was prepared and its mass (Ag) was measured. The sample was immersed in tap water for 1 minute and then placed on a flat surface inclined at 45 degrees with the waterproof layer side in contact. The sample was left to stand for 30 seconds to remove excess water. The mass (Bg) of the sample was then measured and used as the mass after water absorption. The water absorption was calculated using the following formula: Water absorption (g / m 2 )=(BA)×400

[0047] (2) Thickness The thickness was measured using a thickness measuring device (Daiei FS-60DS, measuring terminal φ50 mm).

[0048] (3) Liquid return The mass (Ag) of the filter paper was measured. 5 mL of water was poured into the center of a 12.5 cm x 15 cm sample using a dropper and allowed to stand for 5 minutes. Then, a filter paper (90 mm diameter filter paper weighing 20 g ± 1 g) was placed on the liquid-injected portion and allowed to stand for 30 seconds. The mass (Bg) of the filter paper after the test was measured, and the amount of liquid returning was calculated using the following formula. Amount of liquid returned (g) = BA

[0049] (4) Liquid permeability test method A vertically standing cylinder (inner diameter 25.4 mm) was fitted with a wire mesh (150 μm opening, Sansho Co., Ltd. Biocolumn Sintered Stainless Steel Filter 30SUS) and a capillary tube (inner diameter 4 mm, length 8 cm) with a stopcock (inner diameter 2 mm) at the bottom of its opening. A 28 mm diameter sample was placed on the wire mesh. With the stopcock closed, 100 mL of water was poured into the cylinder. A 2 mm diameter cylindrical rod with a 25 mm diameter wire mesh at its tip, with 150 μm openings, was then inserted into the cylinder, bringing the wire mesh into contact with the sample. After leaving the cylinder in this state for 1 minute, the stopcock was opened to allow the liquid to flow. The time (T1) (seconds) until the liquid level in the cylinder reached the 40 mL mark (i.e., 20 mL of liquid had passed) was measured. The measured time (T1) (seconds) was used to calculate the liquid permeation rate using the following equation: In the formula, T0 (seconds) is the time required for 20 ml of water to pass through the wire mesh without placing a measurement sample in the cylindrical filtration tube.

[0050] Liquid permeation rate (sec) = (T1-T0) Measurements were performed five times (n=5), one value from each of the top and bottom was discarded, and the average of the remaining three values ​​was used as the measurement value. These measurements were performed at 23±2°C and a relative humidity of 50±5%, and the sample was stored in the same environment for at least 24 hours before measurement.

[0051] (5) Surface dryness value by SDME The surface dryness value using SDME was measured using an SDME (Surface Dryness Measurement Equipment) tester (manufactured by WK Systems) using the following procedure. The detector of the SDME tester was placed on a sufficiently wetted sample (immersed in water to cover the sample and left for 60 minutes) and set to 0% dryness. Next, the detector of the SDME tester was placed on a dry sample (heat-dried at 50°C for 2 hours) and set to 100% dryness, and the SDME tester was calibrated.

[0052] Next, an acrylic resin ring (inner diameter 70 mm, outer diameter 80 mm, length 50 mm, mass 50 g) was placed in the center of the sample to be measured, and 5 mL of 0.9% saline was injected. Two minutes after injection, the acrylic resin ring was removed, and the SDME detector was placed in the center of the sample so that it was in contact with the sample, and measurement began. The value measured 5 minutes after the start of measurement was taken as the surface dryness value measured by SDME.

[0053] (6) Monitor evaluation test A 25cm x 40cm sample sheet was attached to the floor, and 20cc of tap water was poured in from a height of 75cm. A filter paper of the same size as the sample sheet was placed next to the sample attached to the floor, leaving no gaps between them, and two minutes after the liquid was poured in, a 5kg four-wheeled cart was passed over the sample sheet and filter paper at a speed of 0.8m / s. At this time, at least two of the wheels were required to pass over the area where the liquid was poured in. A monitor evaluation of the usability was conducted based on the ease of passage of the cart and the wheel marks left on the filter paper. Evaluation criteria: ○:Good △:Normal ×: Not good

[0054] [Making multilayer sheets] (Multi-layer sheet 1) A multilayer sheet was produced by laminating a liquid-permeable layer, a water-absorbent layer, and a waterproof layer in this order. The liquid-permeable layer and the water-absorbent layer, and the water-absorbent layer and the waterproof layer were bonded together using a hot melt adhesive. The following liquid-permeable layer, water-absorbent layer, and waterproof layer were used. Liquid-permeable layer: Berry HS-52 (polyethylene sheet with an opening rate of 26%: liquid permeation rate of 4.00 seconds) Absorbent layer 1: 70g / m 2 , 1.2mm thick airlaid nonwoven fabric Waterproof layer: Toraytec R213 manufactured by Toray Film Processing Co., Ltd.

[0055] (Multi-layer sheet 2) Water absorption layer: 125g / m 2 Multilayer sheet 2 was produced in the same manner as multilayer sheet 1, except that a 2 mm thick air-laid nonwoven fabric (water absorption layer 2) was used.

[0056] (Multi-layer sheet 3) Multilayer sheet 3 was produced in the same manner as multilayer sheet 1, except that PTA manufactured by Berry (polyethylene sheet with an opening ratio of 45%: liquid permeation rate: 2.35 seconds) was used as the liquid-permeable layer.

[0057] (Multi-layer sheet 4) Water absorption layer: 125g / m 2 Multilayer sheet 4 was produced in the same manner as multilayer sheet 3, except that a 2 mm thick air-laid nonwoven fabric (water absorption layer 2) was used.

[0058] (Multi-layer sheet 5) Water absorption layer: 60g / m 2 Multilayer sheet 5 was produced in the same manner as multilayer sheet 3, except that a 1 mm thick air-laid nonwoven fabric (water absorption layer 3) was used.

[0059] (Multi-layer sheet 6) Water absorption layer: 60g / m 2 Multilayer sheet 6 was produced in the same manner as multilayer sheet 3, except that a 0.9 mm thick air-laid nonwoven fabric (water absorption layer 4) was used.

[0060] (Multi-layer sheet 7) Water absorption layer: 150g / m 2 Multilayer sheet 7 was produced in the same manner as multilayer sheet 3, except that a 2.9 mm thick air-laid nonwoven fabric (water absorption layer 5) was used.

[0061] (Multi-layer sheet 8) Multilayer sheet 8 was produced in the same manner as multilayer sheet 1, except that a spunlace nonwoven fabric WJ40R (liquid permeation rate: 6.05 seconds) manufactured by Kinboshi Paper Co., Ltd. was used as the liquid-permeable layer.

[0062] (Multi-layer sheet 9) Multilayer sheet 9 was produced in the same manner as multilayer sheet 2, except that a spunlace nonwoven fabric WJ40R (liquid permeation rate: 6.05 seconds) manufactured by Kinboshi Paper Co., Ltd. was used as the liquid-permeable layer.

[0063] (Multilayer sheet 10) A commercially available multilayer sheet (0.7 mm thick) in which a nonwoven fabric layer was laminated onto a waterproof layer was evaluated.

[0064] (Multilayer sheet 11) A commercially available multilayer sheet (0.4 mm thick) in which a nonwoven fabric layer was laminated onto a waterproof layer was evaluated.

[0065] The structure of the multilayer sheet and the evaluation results are shown in Table 1.

[0066] [Table 1]

[0067] From the results in Table 1, it can be seen that the multilayer sheet having a liquid-permeable layer and a water-absorbent layer has a thickness of 3 mm or less, a liquid return amount of 2.2 g or less, and a water absorption amount of 580 g / m 2 ~2,000g / m 2 It can be seen that the multilayer sheets 1 to 6 have the desired water absorption capacity, yet the change in thickness before and after water absorption is small. [Industrial Applicability]

[0068] The multilayer sheet of the present invention can be suitably used as medical drapes, absorbent sheets for examination and operating tables, drip sheets, floor sheets in medical settings, etc. It can also be used not only in medical and nursing care settings, but also in places and situations where stain resistance and water absorption are required, such as living spaces (kitchens, bathrooms, changing rooms, and toilet areas), wet areas in stores, and public facilities. It can also be suitably used as various drip sheets for food, anti-condensation sheets, pet sheets, kitchen oil absorbent sheets, industrial cleaning water absorbent sheets, cutting oil absorbent sheets, and reagent and other absorbent sheets in research institutions.

Claims

1. A liquid-permeable layer which is a sheet and / or film having openings; A multi-layer floor sheet having a water-absorbing layer containing a short-fiber nonwoven fabric, The thickness of the multilayer sheet is 3 mm or less, The amount of liquid returning is 2.2 g or less, Water absorption capacity: 580g / m ２ Up to 2,000 g / m ２ A multilayer floor sheet characterized by:

2. 2. The multilayer floor sheet according to claim 1, further comprising a waterproof layer on the water-absorbing layer side.

3. 3. The multilayer floor sheet according to claim 1, wherein the water-absorbing layer is an air-laid nonwoven fabric.

4. The multilayer sheet for floors according to any one of claims 1 to 3, wherein the liquid permeation rate of the liquid permeable layer is 6 seconds or less.

5. The multilayer sheet for floors according to any one of claims 1 to 4, wherein the surface dryness value is 40% or more.

6. The multilayer sheet for floors according to any one of claims 1 to 5, wherein the change in thickness before and after water absorption is 10% or less.

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