Composite nonwoven wiper

Abstract

To provide a colored composite nonwoven fabric wiper that retains soft touch and wiping feeling without causing noticeable dropping of pulp and the like even if being subjected to a disinfection and cleaning process using a washing machine and the like and enables wiping operation with soft touch even if being wetted with liquid.SOLUTION: A composite nonwoven fabric wiper is formed by integrally laminating a pulp fiber web on a colored spunbonded nonwoven fabric. The composite nonwoven fabric has basis weight of 70 g / m2 or more and 140 g / m2 or less, ratio of the spunbonded nonwoven fabric of 10 mass% or more and 30 mass% or less, and ratio of the pulp fiber web of 70 mass% or more and 90 mass% or less. Square root of a product of tensile strengths in a lengthwise direction and a crosswise direction in a dry state is 17.7 N / 25 mm or more and 60.6 N / 25 mm or less. Square root of a product of the tensile strengths in the lengthwise direction and the crosswise direction in a wetted state is 16.7 N / 25 mm or more and 58.7 N / 25 mm or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a composite nonwoven wiper including a colored nonwoven fabric. [Background technology]

[0002] Conventionally, paper wipers containing pulp fiber webs or nonwoven wipers containing synthetic fibers have been used to wipe the surfaces of machines, devices, and utensils used in food manufacturing, processing, treatment, and cooking, or the hands of workers.

[0003] Meanwhile, a technology is known for producing a sheet that combines strength and liquid absorbency by hydroentangling pulp fibers, which have excellent absorbency for aqueous and oily liquids, with a spunbond nonwoven fabric made of synthetic fibers, which have excellent strength. The pulp fiber web can be supplied as a sheet made by a general wet papermaking method or wet papermaking, or by dry airlaid.

[0004] Composite nonwoven fabrics made using the above technology combine strength with liquid absorption and retention, and can be used in a wide variety of applications, including the surfaces of machinery, equipment, and utensils used in food manufacturing, processing, and treatment, and cooking, as well as for wiping workers' hands.

[0005] Furthermore, colored wipers such as counter cloths have been used in the past to prevent contamination when wiping the surfaces of machinery, equipment, and utensils used in food manufacturing, processing, treatment, and cooking, or the hands of workers.

[0006] When coloring the composite nonwoven fabric produced by the above-mentioned technology to make a colored wiper, there are methods of coloring the pulp fiber or the spunbond nonwoven fabric, but from the viewpoint of preventing color transfer, a technology of coloring the spunbond nonwoven fabric is known. Such colored wipers made of composite nonwoven fabric are popular and used not only for food-related purposes but also for industrial purposes such as wiping bicycles and machinery because of their color.

[0007] As a prior art document of such a colored composite nonwoven fabric wiper, for example, Patent Document 1 describes a pulp-mixed spunlace nonwoven fabric in which a spunbond nonwoven fabric made of synthetic resin fibers and pulp fibers are entangled, and the basis weight is 40 to 70 g / m 2 The weight of the spunbond nonwoven fabric is 10 to 25 g / m 2 The nonwoven fabric duster disclosed has a pulp fiber ratio of 60 to 80 mass % and a spunbond nonwoven fabric ratio of 20 to 40 mass %, and the synthetic resin fibers constituting the spunbond nonwoven fabric are colored fibers that have been colored by kneading a coloring agent into them, and the pulp fiber and the colored fibers constituting the spunbond nonwoven fabric are different colors. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 2019-063221 Summary of the Invention [Problem to be solved by the invention]

[0009] Due to the recent rise in awareness of hygiene, it is recommended that these wipers be disposable, but depending on the dirt and object being wiped, many wipers are still disinfected and cleaned before being reused.

[0010] However, the composite nonwoven fabrics made from pulp fibers and spunbond nonwoven fabrics are prone to pulp fiber shedding when disinfected with bleach or washed in a washing machine, making repeated use difficult. The shedding of pulp fibers is particularly noticeable in colored spunbond nonwoven fabrics, deteriorating their appearance. Therefore, it has been considered to use nonwoven fabrics made from rayon or polyester fibers using spunlace, such as the commonly used countercloths. However, although these nonwoven fabrics have high durability, they are inferior in softness and have poor feel and usability.

[0011] The present invention has been made in view of the above circumstances, and aims to provide a colored composite nonwoven fabric wiper that does not show significant shedding of pulp or the like even when subjected to disinfection and cleaning processes using a washing machine or the like, has a soft feel and wiping sensation, and allows for wiping work with a soft feel even when wet with liquid. [Means for solving the problem]

[0012] The inventors have conducted extensive research and have found that, in a composite nonwoven wiper comprising a colored spunbond nonwoven fabric and a pulp fiber web laminated thereon, by adjusting the basis weight of the composite nonwoven fabric and the respective proportions of the spunbond nonwoven fabric and the pulp fiber web within predetermined ranges, and also adjusting the square root of the product of the tensile strengths of the composite nonwoven fabric in the machine and cross directions when dry, the square root of the product of the tensile strengths of the composite nonwoven fabric in the machine and cross directions when wet, as well as the water absorption rate, water supply amount, and shape retention time in an underwater agitation test within predetermined ranges, it is possible to produce a colored composite nonwoven wiper that does not show significant shedding of pulp or the like even when subjected to disinfection or cleaning processes in a washing machine or the like, has a soft feel and wiping sensation, and is capable of wiping with a soft feel even when wet with liquid, thereby completing the present invention.

[0013] (1) The first aspect of the present invention is a wiper made of a composite nonwoven fabric, in which a pulp fiber web is laminated and integrated onto a colored spunbond nonwoven fabric, and the composite nonwoven fabric has a basis weight of 70 g / m 2 More than 140g / m 2the composite nonwoven fabric has a ratio of spunbond nonwoven fabric of 10% by mass or more and 30% by mass or less, a ratio of pulp fiber web of 70% by mass or more and 90% by mass or less, the composite nonwoven fabric has a square root of the product of the tensile strength in the machine direction and the tensile strength in the cross direction (GMT) in a dry state of 17.7 N / 25 mm or more and 60.6 N / 25 mm or less, the composite nonwoven fabric has a square root of the product of the tensile strength in the machine direction and the tensile strength in the cross direction (GMT) in a wet state of 16.7 N / 25 mm or more and 58.7 N / 25 mm or less, the composite nonwoven fabric has a water absorption speed of 5.0 seconds or less and a water absorption per unit area (TWA) of 320 g / m 2 The above is a composite nonwoven fabric wiper characterized by having a shape retention time of 6 minutes or more in an underwater agitation test.

[0014] (2) A second aspect of the present invention is a composite nonwoven fabric wiper according to (1), characterized in that the composite nonwoven fabric has a dry longitudinal tensile strength of 24.5 N / 25 mm or more and 78.5 N / 25 mm or less, and a dry transverse tensile strength of 11.8 N / 25 mm or more and 53.9 N / 25 mm or less, and the wet composite nonwoven fabric has a wet longitudinal tensile strength of 21.6 N / 25 mm or more and 76.5 N / 25 mm or less, and a wet transverse tensile strength of 9.8 N / 25 mm or more and 47.1 N / 25 mm or less.

[0015] (3) A third aspect of the present invention is the composite nonwoven fabric wiper described in (1), characterized in that the spunbond nonwoven fabric has a tensile strength in the machine direction when dry of 9.8 N / 25 mm or more and 34.3 N / 25 mm or less, and a tensile strength in the cross direction when dry of 4.9 N / 25 mm or more and 21.6 N / 25 mm or less.

[0016] (4) A fourth aspect of the present invention is a composite nonwoven fabric wiper according to (1), wherein the spunbond nonwoven fabric includes a plurality of fusion points that connect the spun resin fibers, and the area of ​​each fusion point is 0.10 mm 2 Over 0.50mm 2The area ratio of the fusion points in the spunbonded nonwoven fabric is 7% or more and 20% or less, and the number of the fusion points per unit area in the spunbonded nonwoven fabric is 10 / cm. 2 More than 150 pieces / cm 2 The present invention is characterized in that the spunbond nonwoven fabric contains one or more synthetic fibers selected from the group consisting of nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, and polystyrene, and the pulp fiber web contains one or more softwood bleached kraft pulp fibers selected from the group consisting of radiata pine, slash pine, southern pine, lodgepole pine, spruce, and Douglas fir. [Effects of the Invention]

[0017] According to the present invention, a colored composite nonwoven fabric wiper can be provided which does not show significant shedding of pulp or the like even when subjected to disinfection and cleaning processes using a washing machine or the like, has a soft feel and wiping comfort, and can be used for wiping with a soft feel even when wet with liquid. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, a mode for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. The following present embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following content. The present invention can be carried out by appropriately modifying it within the scope of its gist.

[0019] <Composite nonwoven wiper> The composite nonwoven fabric wiper according to this embodiment is a composite nonwoven fabric wiper in which a pulp fiber web is laminated and integrated onto a colored spunbond nonwoven fabric. From the viewpoint of visibility, the color of the spunbond nonwoven fabric is preferably blue.

[0020] The spunbond nonwoven fabric preferably contains one or more synthetic fibers selected from the group consisting of nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, and polystyrene, and more preferably contains polypropylene.

[0021] It is preferable that the spunbond nonwoven fabric contains a plurality of fusion points that connect the spun resin fibers. 2 More than 0.50mm 2 It is preferable that the area ratio of fusion points in the spunbonded nonwoven fabric is 7% or more and 20% or less, and the number of fusion points per unit area in the spunbonded nonwoven fabric is 10 / cm 2 More than 150 pieces / cm 2 When the area, area ratio, and number of fused points are all within the above ranges, a composite nonwoven fabric wiper can be obtained that does not lose much pulp or the like even when subjected to a disinfection or cleaning process using a washing machine or the like. The shape of the fusion point is not particularly limited as long as it is a general shape such as a circle, an ellipse, or a polygon.

[0022] The pulp fiber web preferably comprises fibers of one or more types of bleached softwood kraft pulp (NBKP) selected from the group consisting of radiata pine, slash pine, southern pine, lodgepole pine, spruce, and Douglas fir. In addition to softwood bleached kraft pulp (NBKP), general pulp fibers such as hardwood bleached kraft pulp (LBKP) may also be included, but softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBKP) are preferred. The NBKP to LBKP content ratio in the pulp fibers is preferably 50:50 or more and 100:0 or less, more preferably 70:30 or more and 100:0 or less, even more preferably 90:10 or more and 100:0 or less, and most preferably 100:0.

[0023] In the composite nonwoven fabric according to this embodiment, the proportion of the spunbond nonwoven fabric is 10% by weight to 30% by weight, and the proportion of the pulp fiber web is 70% by weight to 90% by weight. By keeping the proportions within the above ranges, the composite nonwoven fabric wiper can have excellent water absorption performance and maintain a soft feel in both dry and wet conditions. The lower limit of the proportion of the spunbond nonwoven fabric is preferably 13% by weight or more, more preferably 15% by weight or more. The upper limit is preferably 23% by weight or less, more preferably 20% by weight or less. The lower limit of the proportion of the pulp fiber web is preferably 77% by weight or more, more preferably 80% by weight or more. The upper limit is preferably 87% by weight or less, more preferably 85% by weight or less.

[0024] (Physical Properties) The basis weight of the composite nonwoven fabric according to this embodiment is 70 g / m 2 More than 140g / m 2 When the basis weight of the composite nonwoven fabric is within the above range, the composite nonwoven fabric wiper can have excellent water absorption performance and maintain a soft feel both in dry and wet conditions. The lower limit of the basis weight of the composite nonwoven fabric according to this embodiment is preferably 80 g / m 2 More preferably, it is 85 g / m or more. 2 The upper limit is preferably 125 g / m 2 or less, more preferably 100 g / m 2 The following is the result.

[0025] The lower limit of the basis weight of the spunbond nonwoven fabric is preferably 8.0 g / m 2 More preferably, it is 10.0 g / m or more. 2 More preferably, it is 12.0 g / m or more. 2 The upper limit is preferably 35.0 g / m 2 or less, more preferably 30.0 g / m 2 More preferably, it is 25.0 g / m or less. 2When the basis weight of the spunbond nonwoven fabric is within the above range, a composite nonwoven fabric wiper can be obtained that has excellent water absorption performance and can maintain softness both in dry and wet conditions.

[0026] Furthermore, the basis weight of the pulp fiber web preferably has a lower limit of 50.0 g / m 2 More preferably, 55.0 g / m 2 More preferably, it is 65.0 g / m or more. 2 The upper limit is preferably 125.0 g / m 2 or less, more preferably 110.0 g / m 2 or less, and more preferably 100.0 g / m 2 By having the basis weight within the above range, it is possible to obtain a composite nonwoven fabric wiper that has excellent water absorption performance and can maintain softness both in dry and wet conditions. The basis weights of the composite nonwoven fabric, spunbond nonwoven fabric, and pulp fiber web are all measured in accordance with JIS P 8124. The basis weights of the spunbond nonwoven fabric and pulp fiber web are measured individually before being laminated and integrated.

[0027] The composite nonwoven fabric according to this embodiment preferably has a dry longitudinal tensile strength of 24.5 N / 25 mm or more and 78.5 N / 25 mm or less. When the dry longitudinal tensile strength is within this range, the composite nonwoven fabric wiper has excellent water absorption performance and provides a comfortable wiping experience. The lower limit of the tensile strength in the machine direction of the composite nonwoven fabric in a dry state is more preferably 27.5 N / 25 mm or more, and even more preferably 29.4 N / 25 mm or more, and the upper limit is more preferably 73.5 N / 25 mm or less, and even more preferably 39.2 N / 25 mm or less.

[0028] Similarly, the tensile strength in the cross direction of the composite nonwoven fabric when dry is preferably 11.8 N / 25 mm or more and 53.9 N / 25 mm or less. When the tensile strength in the cross direction when dry is within the above range, the composite nonwoven fabric wiper has excellent water absorption performance and provides a comfortable wiping experience. The lower limit of the tensile strength in the cross direction of the composite nonwoven fabric in a dry state is more preferably 13.7 N / 25 mm or more, and even more preferably 14.7 N / 25 mm or more, and the upper limit is more preferably 49.0 N / 25 mm or less, and even more preferably 29.4 N / 25 mm or less.

[0029] Furthermore, the square root of the product of the tensile strength in the machine direction and the tensile strength in the cross direction (GMT) when dry for the composite nonwoven fabric is 17.7 N / 25 mm or more and 60.6 N / 25 mm or less. When the square root of the product of the tensile strength in the machine direction and the tensile strength in the cross direction (GMT) when dry is within the above numerical range, the composite nonwoven fabric wiper can be made with little significant shedding of pulp, etc., even when subjected to disinfection and cleaning processes using a washing machine, etc. The square root of the product of the tensile strength in the machine direction and the tensile strength in the cross direction (GMT) of the composite nonwoven fabric in a dry state is preferably 19.6 N / 25 mm or more in lower limit, more preferably 20.6 N / 25 mm or more in upper limit, preferably 57.8 N / 25 mm or less in upper limit, more preferably 34.3 N / 25 mm or less in upper limit.

[0030] Furthermore, the spunbond nonwoven fabric preferably has a tensile strength in the machine direction when dry of 9.8 N / 25 mm or more and 34.3 N / 25 mm or less. When the tensile strength in the machine direction when dry of the spunbond nonwoven fabric is within the above range, the resulting composite nonwoven fabric wiper has excellent water absorption performance and a comfortable wiping experience. The lower limit of the tensile strength in the machine direction of the spunbond nonwoven fabric in a dry state is more preferably 11.8 N / 25 mm or more, and even more preferably 13.7 N / 25 mm or more, and the upper limit is more preferably 29.4 N / 25 mm or less, and even more preferably 19.6 N / 25 mm or less.

[0031] Similarly, the tensile strength in the cross direction of the spunbond nonwoven fabric when dry is preferably 4.9 N / 25 mm or more and 21.6 N / 25 mm or less. When the tensile strength in the cross direction of the spunbond nonwoven fabric when dry is within the above range, the resulting composite nonwoven fabric wiper has excellent water absorption performance and a comfortable wiping experience. The lower limit of the tensile strength in the cross direction of the spunbond nonwoven fabric in a dry state is more preferably 5.9 N / 25 mm or more, and even more preferably 6.9 N / 25 mm or more, and the upper limit is more preferably 17.7 N / 25 mm or less, and even more preferably 14.7 N / 25 mm or less.

[0032] Furthermore, the wet longitudinal tensile strength of the composite nonwoven fabric according to this embodiment is preferably 21.6 N / 25 mm or more and 76.5 N / 25 mm or less. When the wet longitudinal tensile strength is within this range, the composite nonwoven fabric wiper can have excellent water absorption performance and a comfortable wiping experience. The lower limit of the wet longitudinal tensile strength of the composite nonwoven fabric is more preferably 24.5 N / 25 mm or more, and even more preferably 27.5 N / 25 mm or more, and the upper limit is more preferably 68.6 N / 25 mm or less, and even more preferably 49.0 N / 25 mm or less.

[0033] Similarly, the wet lateral tensile strength of the composite nonwoven fabric is preferably 9.8 N / 25 mm or more and 47.1 N / 25 mm or less. When the wet lateral tensile strength is within the above range, the composite nonwoven fabric wiper has excellent water absorption performance and provides a comfortable wiping experience. The lower limit of the wet tensile strength in the cross direction of the composite nonwoven fabric is more preferably 11.8 N / 25 mm or more, and even more preferably 14.7 N / 25 mm or more, and the upper limit is more preferably 44.1 N / 25 mm or less, and even more preferably 24.5 N / 25 mm or less.

[0034] Similarly, the square root of the product of the tensile strength in the machine direction and the tensile strength in the cross direction when wet (GMT) of the composite nonwoven fabric is 16.7 N / 25 mm or more and 58.7 N / 25 mm or less. When the square root of the product of the tensile strength in the machine direction and the tensile strength in the cross direction when wet (GMT) is within the above numerical range, the composite nonwoven fabric wiper can be made with little significant shedding of pulp, etc., even when subjected to disinfection and cleaning processes using a washing machine, etc. The square root of the product of the wet longitudinal tensile strength and the wet transverse tensile strength (GMT) of the composite nonwoven fabric is preferably 17.7 N / 25 mm or more, more preferably 18.6 N / 25 mm or more, and the upper limit is preferably 55.8 N / 25 mm or less, more preferably 32.4 N / 25 mm or less.

[0035] The tensile strength of composite nonwoven fabrics and spunbond nonwoven fabrics in each direction is measured by cutting dry or wet nonwoven fabrics into 25 mm strips and measuring the strength in the machine direction (MD: the feed direction during manufacturing) and the cross direction (CD: the width direction perpendicular to the MD) using a tensile tester. The square root of the product (GMT) is then calculated from the tensile strengths measured in each direction. The tensile strength of spunbond nonwoven fabrics is measured individually before they are laminated and integrated.

[0036] The thickness of the composite nonwoven fabric is preferably 0.35 mm or more, more preferably 0.45 mm or more, and even more preferably 0.50 mm or more. By having the thickness within the above numerical range, the composite nonwoven fabric wiper can have excellent water absorption performance and maintain a soft feel both in dry and wet conditions. The thickness is 37.85gf / m using a Peacock paper thickness gauge. 2 Measured at.

[0037] (Water absorption performance) The water absorption rate of the composite nonwoven fabric is 5.0 seconds or less, preferably 3.5 seconds or less, and more preferably 2.5 seconds or less. By having the water absorption rate within the above range, the composite nonwoven fabric wiper can have excellent water absorption performance. The water absorption rate is also called drop water absorption, and is an index of liquid absorption and liquid retention. The measurement method conforms to the dropping method specified in JIS L 1907, and measures the time (seconds) from when a 0.1 mL drop of water reaches the surface of the test piece until the specular reflection of the test piece disappears.

[0038] Furthermore, the total water absorption per unit area (TWA) of the composite nonwoven fabric is 320 g / m 2 or more, 350 g / m 2 It is preferable that the weight is 380 g / m or more. 2 When the water absorption amount is within the above range, the composite nonwoven fabric wiper can have excellent water absorption performance. The water absorption (TWA) of a composite nonwoven fabric is measured by first cutting a wiper (composite nonwoven fabric) into a 76mm x 76mm square to prepare a sample, and then measuring the dry weight of the sample. Next, the sample is immersed in distilled water for 2 minutes, and then hung in a container saturated with water vapor, with one corner of the sample as the upper apex, and this apex and the two adjacent corners supported and stretched, and left for 30 minutes, after which the weight is measured after draining. Finally, from the measured values ​​obtained, the dry weight of 1m of sample is calculated. 2 Water retention capacity per unit = Water absorption capacity (g / m 2 ) is found.

[0039] The shape retention time of the composite nonwoven fabric in an underwater agitation test is 6 minutes or more, preferably 8 minutes or more, and more preferably 10 minutes or more. When the shape retention time is within the above range, the composite nonwoven fabric wiper has excellent water absorption performance. The underwater agitation test involves placing a composite nonwoven fabric in a beaker filled with water and agitating it with an agitator. The agitation is stopped every minute, and the composite nonwoven fabric is visually inspected for signs of pulp loss, tears, etc. Specifically, the beaker contains 750 mL of water, and five 50 mm x 50 mm composite nonwoven fabric test pieces are placed inside. The test piece that shows the most visible change in appearance is evaluated. The agitator is a 50 mm diameter, four-blade propeller type, and the agitator is a Three-One Motor BL3000, rotating at 1200 rpm. The test is terminated when pulp loss or tears of 5 mm x 5 mm or greater occur in the test piece.

[0040] <Manufacturing method for composite nonwoven wipers> The method for producing the composite nonwoven fabric wiper according to this embodiment is not particularly limited, and it can be produced by a known method for producing a nonwoven fabric wiper. Such a manufacturing method may include, for example, steps such as (1) manufacturing a composite nonwoven fabric, (2) cutting, and (3) packaging, but other steps may also be added.

[0041] In the production of the composite nonwoven fabric (1), the method of laminating the pulp fiber web on the colored spunbond nonwoven fabric and then integrating them may be a common method such as spunlace, but from the viewpoints of water absorption performance and abrasion resistance, hydroentanglement is preferred. The integration process by hydroentanglement is described in detail, for example, in Japanese Patent No. 6758116. In the production of the composite nonwoven fabric (1), the forming section is preferably an airlaid method, and the dryer section is preferably a through-air dryer. Compared to the wet method (pulp fiber sheet), the airlaid method has fewer bonds between pulp fibers, so the pulp fibers tend to scatter during hydroentanglement and spunlace treatments, making it easier for the spunbond layer to be exposed on the surface, thereby reducing the difference in color between the front and back.

[0042] Furthermore, in the production of the composite nonwoven fabric (1), it is preferable to add a chemical solution containing a wet strength agent and an anionic water-soluble polymer to the pulp fiber web side in order to prevent pulp and the like from falling off. Specifically, the chemical solution to be added contains a wet strength agent and an anionic water-soluble polymer, and the wet strength agent preferably contains polyamide epichlorohydrin (PAE), and the anionic water-soluble polymer preferably contains carboxymethyl cellulose (CMC). By containing a wet strength agent, particularly polyamide epichlorohydrin (PAE), and an anionic water-soluble polymer, particularly carboxymethyl cellulose (CMC), the chemical solution can effectively suppress the falling off of pulp and the like when wiping with a composite nonwoven fabric wiper, especially when wet.

[0043] The wet strength agent may contain, in addition to polyamide epichlorohydrin (PAE), polyacrylamide (PAM), polyamide epoxy, polyamide polyamine, etc., and the anionic water-soluble polymer may contain, in addition to carboxymethyl cellulose (CMC), polyacrylamide (PAM), etc. As the polyamide epichlorohydrin wet strength agent, for example, strength agents WS4030, WS4038, WS4027 manufactured by Seiko PMC Co., Ltd. can be used, and as the carboxymethyl cellulose (CMC), Sunrose manufactured by Nippon Paper Industries Co., Ltd. can be used.

[0044] As described above, according to the present embodiment of the invention, a colored composite nonwoven fabric wiper can be provided which does not show significant shedding of pulp or the like even when subjected to a disinfection / cleaning process using a washing machine or the like, has a soft feel and wiping comfort, and can be used for wiping with a soft feel even when wet with liquid. [Example]

[0045] The present invention will be explained in more detail with reference to the following examples and comparative examples, but the present invention is not limited to these examples in any way.

[0046] Composite nonwoven fabric wipers for each of Examples 1 to 5 and Comparative Examples 1 to 7 were produced under the conditions shown in Table 1, and then the following evaluations were carried out. In all Examples and Comparative Examples, a pulp fiber web was layered on a spunbond nonwoven fabric containing polypropylene as a synthetic fiber, and the resulting composite nonwoven fabric was integrated by hydroentangling to form a base fabric. The spunbond nonwoven fabric was blue in color ("SB" in Table 1 refers to spunbond nonwoven fabric).

[0047] 1. Usability (ease of wiping) The ease of wiping off dirt or other objects with the wiper was evaluated sensorily on a 5-point scale. The evaluation was based on the following criteria: "3" indicates that there were no problems with flexibility or absorbency in use and that the wiping experience was good; "4" indicates that it was slightly better; "5" indicates that it was excellent; "2" indicates that it was slightly worse; and "1" indicates that it was poor.

[0048] 2.Water absorption performance When wiping off water in a dry state, the wiper's water absorption performance was evaluated sensorily on a 5-point scale. Each rating was given as follows: "3" if the absorbency (absorption speed, amount of absorbed water) was acceptable in use, "4" if slightly better, "5" if excellent, "2" if slightly worse, and "1" if poor.

[0049] 3. Softness When wiping in a dry state, the softness of the wiper was evaluated sensorily on a 5-point scale. The evaluation was based on the following criteria: "3" indicates that the softness was acceptable for use, "4" indicates that it was slightly better, "5" indicates that it was excellent, "2" indicates that it was slightly worse, and "1" indicates that it was poor.

[0050] 4. Chewy When wiping was performed in a dry state, the stiffness of the wiper was evaluated sensorily on a 5-point scale. The evaluation was as follows: "3" indicates that the firmness was acceptable for use, "4" indicates that it was slightly better, "5" indicates that it was excellent, "2" indicates that it was slightly worse, and "1" indicates that it was poor.

[0051] 5. Softness when wet The wiper was immersed in water to moisten it, and the softness when wiping with water was evaluated sensorily on a 5-point scale. The evaluation was based on the following criteria: "3" indicates that the softness was acceptable for use, "4" indicates that it was slightly better, "5" indicates that it was excellent, "2" indicates that it was slightly worse, and "1" indicates that it was poor.

[0052] 6. Washing durability The wipers were selected and washed in a washing machine to evaluate the number of washes required before the surface deteriorated. The washing machine was a Toshiba AW-GN5GC(W), and the number of washes required until the wiper surface showed obvious pulp loss or tearing was evaluated using a sensory evaluation scale of 1 to 5. For each evaluation, a "3" was given if a difference was apparent at the end of the third time, a "4" if a difference was apparent at the end of the fourth time, a "5" if a difference was apparent after the fifth time or more, a "2" if a difference was apparent at the end of the second time, and a "1" if a difference was apparent at the end of the first time.

[0053] 7. Color transfer (hot water 100℃) The wiper was immersed in hot water for 10 minutes and the color of the hot water was checked to see if it changed. For each evaluation, those whose color did not transfer to the hot water were given a "good" mark, and those whose color transferred to the hot water were given a "bad" mark.

[0054] 8. Color migration (70% ethanol) The wiper was placed between filter paper and immersed in 70% ethanol. The wiper was then removed from the immersion and left in the air for 24 hours. For each evaluation, "◯" was given to samples in which no color was transferred to the filter paper, and "×" was given to samples in which color was transferred to the filter paper.

[0055] 9. Color transfer (grain vinegar) The wipers were placed between filter papers and immersed in vinegar. They were then removed from the immersion and left in the air for 24 hours. For each evaluation, "◯" was given to samples in which no color was transferred to the filter paper, and "×" was given to samples in which color was transferred to the filter paper.

[0056] Table 1 shows the conditions and evaluation results for Examples 1 to 5 and Comparative Examples 1 to 7. When each evaluation was 3 or more or ◯, the product was acceptable. [Table 1]

[0057] From the above, it was confirmed that this example provides a colored composite nonwoven fabric wiper that does not show significant pulp or other material falling off even when subjected to a disinfection / cleaning process using a washing machine or the like, has a soft feel and wiping comfort, and can be used for wiping with a soft feel even when wet with liquid.

Claims

1. A composite nonwoven wiper in which a pulp fiber web is laminated and integrated onto a colored spunbond nonwoven fabric, The composite nonwoven fabric has a basis weight of 70 g / m ２ 140g / m or more ２ is as follows: The composite nonwoven fabric has a spunbond nonwoven fabric content of 10% by mass or more and 30% by mass or less, and a pulp fiber web content of 70% by mass or more and 90% by mass or less, The composite nonwoven fabric has a square root of the product of the tensile strength in the machine direction and the tensile strength in the cross direction (GMT) in a dry state of 17.7 N / 25 mm or more and 60.6 N / 25 mm or less; The composite nonwoven fabric has a square root of the product of the tensile strength in the machine direction and the tensile strength in the cross direction (GMT) when wet of 16.7 N / 25 mm or more and 58.7 N / 25 mm or less, The composite nonwoven fabric has a water absorption rate of 5.0 seconds or less and a water absorption amount per unit area (T.W.A.) of 320 g / m ２ The composite nonwoven fabric wiper is characterized by having a shape retention time of 6 minutes or more in an underwater agitation test.

2. The composite nonwoven fabric has a tensile strength in the machine direction when dry of 24.5 N / 25 mm or more and 78.5 N / 25 mm or less, and a tensile strength in the cross direction when dry of 11.8 N / 25 mm or more and 53.9 N / 25 mm or less, The composite nonwoven fabric wiper according to claim 1, characterized in that the composite nonwoven fabric has a wet longitudinal tensile strength of 21.6 N / 25 mm or more and 76.5 N / 25 mm or less, and a wet transverse tensile strength of 9.8 N / 25 mm or more and 47.1 N / 25 mm or less.

3. 2. The composite nonwoven fabric wiper according to claim 1, wherein the spunbond nonwoven fabric has a tensile strength in the machine direction when dry of 9.8 N / 25 mm or more and 34.3 N / 25 mm or less, and a tensile strength in the cross direction when dry of 4.9 N / 25 mm or more and 21.6 N / 25 mm or less.

4. The spunbond nonwoven fabric includes a plurality of fusion points that connect the spun resin fibers, and the area of ​​each fusion point is 0.10 mm ２ More than 0.50 mm ２ The area ratio of the fusion points in the spunbonded nonwoven fabric is 7% or more and 20% or less, and the number of the fusion points per unit area in the spunbonded nonwoven fabric is 10 / cm. ２ More than 150 pieces / cm ２ is as follows: The spunbond nonwoven fabric contains one or more synthetic fibers selected from the group consisting of nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, and polystyrene, 2. The composite nonwoven wiper of claim 1, wherein the pulp fiber web comprises fibers of one or more softwood bleached kraft pulps selected from the group consisting of radiata pine, slash pine, southern pine, lodgepole pine, spruce, and Douglas fir.

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