Composite nonwoven fabric wiper

Abstract

To provide a composite nonwoven fabric wiper which has high visibility in both front and back, is excellent in water-absorbing performance and abrasion resistance, and reduces fiber falling in water.SOLUTION: A composite nonwoven fabric wiper is obtained by laminating a pulp fiber web on a colored spunbonded nonwoven fabric to integrate. The composite nonwoven fabric wiper is such that: a basis weight of a composite nonwoven fabric is 45.0 g / m2 or more and 85.0 g / m2 or less; a ratio of the spunbonded nonwoven fabric is 15 wt.% or more and 30 wt.% or less; a ratio of the pulp fiber web is 70 wt.% or more and 85 wt.% or less; when a color of the spunbonded nonwoven fabric is expressed by a color space, L* is 65 or less, a* is -30 or more and -10 or less, b* is -30 or less and C* is 30 or more, and a surface of the pulp fiber web in the composite nonwoven fabric has L* of 80 or less, a* of -20 or more and -7 or less, b* of -13 or less and C* of 30 or more; and a color difference ΔE*ab between the surface of the pulp fiber web and the surface of the spunbonded nonwoven fabric is 10 or less.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] Traditionally, when wiping the surfaces of food manufacturing, processing, handling, and cooking machinery, equipment, or the hands of workers, colored wipers are sometimes used on counter cloths, etc., from the perspective of preventing foreign matter contamination.

[0003] On the other hand, there is a known technology for producing sheets that combine strength and liquid absorption by entangling pulp fibers, which are highly absorbent of water-based and oil-based liquids, with spunbond nonwoven fabrics made from synthetic fibers with excellent strength using a water flow (the pulp fiber web can be supplied by general wet papermaking methods, sheets made by wet papermaking, or dry airlaid methods).

[0004] The composite nonwoven fabric using the above technology achieves a balance of strength, liquid absorption, and liquid retention, and can be used in a variety of applications, such as wiping the surfaces of food manufacturing, processing, handling, and cooking machinery, equipment, and utensils, or wiping the hands of workers.

[0005] Prior art documents for such colored composite nonwoven wipers include, for example, Patent Document 1, which describes a pulp-mixed spunlace nonwoven fabric in which spunbond nonwoven fabric made of synthetic resin fibers and pulp fibers are intertwined, with a basis weight of 40-70 g / m². 2 Therefore, the basis weight of the spunbond nonwoven fabric is 10-25 g / m². 2 The disclosed nonwoven fabric duster has a pulp fiber content of 60-80% by mass and a spunbond nonwoven fabric content of 20-40% by mass, wherein the synthetic resin fibers constituting the spunbond nonwoven fabric are colored fibers that have been colored by kneading in a colorant, and the pulp fibers and the colored fibers constituting the spunbond nonwoven fabric are of different colors. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2019-063221 [Overview of the project] [Problems that the invention aims to solve]

[0007] When attempting to color the composite nonwoven fabric of pulp fibers and spunbond nonwoven fabric described above to improve its visibility in the event of food contamination, it is conceivable to color either the pulp fibers or the spunbond nonwoven fabric. Because pulp fibers are highly absorbent, there is a concern that the colorants may easily transfer to the cleaning surface (color transfer is likely). Therefore, coloring spunbond nonwoven fabric is more suitable from the perspective of color transfer.

[0008] However, when spunbond nonwoven fabric is colored and composited with pulp fibers, color transfer is not a problem, but a difference in color occurs between the front and back sides (the spunbond nonwoven fabric side is darker, and the pulp fiber side is lighter). When using composite nonwoven fabrics, pulp fibers and other materials may detach from the composite nonwoven fabric, generating paper dust. If there is a difference in color between the front and back sides, it can be difficult to detect the paper dust, especially on the lighter side. In addition, insufficient color development will diminish the product's value. To resolve the color difference between the front and back sides, one could consider lowering the proportion of pulp fibers relative to the proportion of spunbond nonwoven fabric. However, this would result in inferior water absorption and abrasion resistance, and the fibers would be more prone to shedding in water.

[0009] This invention has been made in view of these circumstances, and aims to provide a composite nonwoven fabric wiper that has high visibility on both sides, excellent water absorption and abrasion resistance, and minimal fiber shedding in water. [Means for solving the problem]

[0010] The inventors conducted diligent research and, in a composite nonwoven fabric wiper in which a pulp fiber web is laminated and integrated onto a colored spunbond nonwoven fabric, adjusted the basis weight of the composite nonwoven fabric and the ratio of the nonwoven fabric to the pulp fiber web within predetermined numerical ranges, and also adjusted the respective indexes of the color spaces on the surfaces of the spunbond nonwoven fabric and the pulp fiber web of the composite nonwoven fabric, as well as the color difference between the pulp fiber web surface and the spunbond nonwoven fabric surface of the composite nonwoven fabric, all within predetermined numerical ranges. As a result, it was possible to create a composite nonwoven fabric wiper with high visibility on both sides, excellent water absorption and abrasion resistance, and minimal fiber shedding in water, thus completing the present invention. In other words, the present invention provides the following:

[0011] (1) A first aspect of the present invention is a composite nonwoven fabric wiper in which a pulp fiber web is laminated and integrated on a colored spunbond nonwoven fabric, wherein the basis weight of the composite nonwoven fabric is 45.0 g / m² 2 More than 85.0g / m 2 The composite nonwoven wiper is characterized in that the proportion of the spunbond nonwoven fabric is 15% to 30% by weight, the proportion of the pulp fiber web is 70% to 85% by weight, when the color of the spunbond nonwoven fabric is expressed in the color space (CIELAB), L* = 65 or less, a* = -30 to -10, b* = -30 or less, and C* = 30 or more, when the surface of the pulp fiber web in the composite nonwoven fabric is expressed in the color space (CIELAB), L* = 80 or less, a* = -20 to -7, b* = -13 or less, and C* = 30 or more, and the color difference ΔE*ab between the surface of the pulp fiber web and the surface of the spunbond nonwoven fabric in the composite nonwoven fabric is 10 or less.

[0012] (2) A second aspect of the present invention is a composite nonwoven wiper as described in (1), wherein the composite nonwoven has a water absorption rate of 2.5 seconds or less and a water absorption capacity (TWA) of 300 g / m². 2 In summary, the characteristic feature is that the Wet Taber value is 6 or more times.

[0013] (3) The third aspect of the present invention is the composite non-woven wiper described in (1), wherein the spunbond non-woven fabric includes a plurality of fusion points connecting the spun resin fibers, and the area per fusion point is 0.10 mm 2 or more and 0.50 mm 2 or less, the area ratio of the fusion points in the spunbond non-woven fabric is 7% or more and 20% or less, and the number of the fusion points per unit area in the spunbond non-woven fabric is 10 pieces / cm 2 or more and 150 pieces / cm 2 or less, the spunbond non-woven 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 fibers of one or more softwood kraft pulps selected from the group consisting of radiata pine, slash pine, southern pine, lodgepole pine, spruce, and Douglas fir.

Advantages of the Invention

[0014] According to the present invention, it is possible to provide a composite non-woven wiper having high visibility on both the front and back, excellent water absorption performance and wear resistance, and little fiber shedding in water.

Embodiments for Carrying Out the Invention

[0015] Hereinafter, embodiments 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 exemplification for explaining the present invention, and is not intended to limit the present invention to the following contents. The present invention can be appropriately modified and implemented within the scope of its gist.

[0016] <Composite non-woven wiper> The composite non-woven wiper according to the present embodiment is a wiper of a composite non-woven fabric in which a pulp fiber web is laminated and integrated on a colored spunbond non-woven fabric.

[0017] 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 is particularly preferably polypropylene.

[0018] Furthermore, it is preferable that the spunbond nonwoven fabric includes multiple fusion points that connect the spun resin fibers. Also, the area of ​​each fusion point should be 0.10 mm². 2 0.50mm or more 2 Preferably, the following conditions are met: the area ratio of fusion points in the spunbond nonwoven fabric is preferably 7% to 20%, and the number of fusion points per unit area in the spunbond nonwoven fabric is 10 / cm². 2 More than 150 pieces / cm 2 The following is preferable: By having the area, area ratio, and number of fusion points all within the above numerical ranges, a composite nonwoven wiper with minimal fiber shedding in water can be obtained. Furthermore, the shape of the fusion point is not particularly limited, as long as it is a common shape such as a circle, ellipse, or polygon.

[0019] The pulp fiber web preferably contains fibers from one or more types of bleached coniferous kraft pulp (NBKP) selected from the group consisting of radiata pine, slush pine, southern pine, lodgepole pine, spruce, and Douglas fir. In addition to bleached softwood kraft pulp (NBKP), other general pulp fibers such as bleached hardwood kraft pulp (LBKP) may also be included, but it is preferable to include both bleached softwood kraft pulp (NBKP) and bleached hardwood kraft pulp (LBKP). Furthermore, the content ratio of NBKP to LBKP in the pulp fibers is preferably 50:50 to 100:0, more preferably 70:30 to 100:0, even more preferably 90:10 to 100:0, and most preferably 100:0.

[0020] In the composite nonwoven fabric according to this embodiment, the proportion of spunbond nonwoven fabric is 15% to 30% by weight, and the proportion of pulp fiber web is 70% to 85% by weight. By keeping each proportion within the above numerical range, a composite nonwoven wiper can be made that has excellent water absorption performance and abrasion resistance, and less fiber shedding in water. The lower limit of the spunbond nonwoven fabric content is preferably 20% by weight or more, and more preferably 23% by weight. The upper limit is preferably 29% by weight or less, and more preferably 28% by weight or less. The lower limit of the pulp fiber web content is preferably 71% by weight or more, and more preferably 72% by weight or more. The upper limit is preferably 80% by weight or less, and more preferably 77% by weight or less.

[0021] (Physical properties) The basis weight of the composite nonwoven fabric according to this embodiment has a lower limit of 45.0 g / m². 2 The above, preferably 49.0 g / m² 2 The above is preferable to 53 g / m². 2 That concludes the explanation. The upper limit is 85.0 g / m². 2 The following, preferably 66.0 g / m² 2 The following, and more preferably, 62.0 g / m² 2 The following applies: By keeping the basis weight within the above numerical range, a composite nonwoven wiper with excellent water absorption and abrasion resistance can be produced. The basis weight of composite nonwoven fabrics is measured in accordance with JIS P 8124.

[0022] Furthermore, the water absorption rate of the composite nonwoven fabric is preferably 2.5 seconds or less, and more preferably 2.0 seconds or less. By having the water absorption rate within the above numerical range, a composite nonwoven wiper with excellent water absorption performance can be obtained. The water absorption rate, also known as the drip absorption rate, is measured in accordance with the drop method specified in JIS L 1907, measuring the time (in seconds) from when a 0.1 mL water droplet reaches the surface of the test specimen until the specular reflection of the specimen disappears.

[0023] Furthermore, the water absorption per unit area (TWA) of the composite nonwoven fabric is 300 g / m². 2 Preferably, it should be 320 g / m² or more. 2 It is more preferable that the values ​​are as described above. By having the water absorption amount within the above numerical range, a composite nonwoven fabric wiper with excellent water absorption performance can be obtained. The method for measuring the total water absorbance (TWA) of composite nonwoven fabric is as follows: First, a wiper (composite nonwoven fabric) is cut into a 76mm x 76mm square to prepare a sample, and the dry weight of the sample is measured. Next, this sample is immersed in distilled water for 2 minutes, and then, in a steam-saturated container, the sample is suspended in an extended state with one corner as the upper apex, supported by this apex and two adjacent corners, and left for 30 minutes to drain the water, after which the weight is measured. Finally, from the obtained measurement value, the weight of 1 m of sample is measured. 2 Water retention capacity per unit area = water absorption capacity (g / m³) 2 )

[0024] Furthermore, the Wet Taber value of the composite nonwoven fabric is preferably 6 or more, and more preferably 10 or more. By having the Wet Taber value within the above numerical range, a composite nonwoven wiper with excellent abrasion resistance can be obtained. The Wet Taber (value) is determined using a Taber tester specified in JIS L 1096. A water-moistened sample is attached to a rotating horizontal disc, and a pair of friction wheels (H-18) formed from abrasive particles are applied under a specified load (4.9N) to examine the wear resistance. The determination is made by counting the number of disc rotations until the hole in the composite nonwoven fabric due to wear becomes 13 mm.

[0025] (color) The spunbond nonwoven fabric included in the composite nonwoven wiper according to this embodiment is colored, and the color is preferably blue from the viewpoint of visibility.

[0026] Furthermore, when the color of the spunbond nonwoven fabric is expressed in the color space (CIELAB), L* = 65 or less, a* = -30 or more and -10 or less, b* = -30 or less, and C* = 30 or more. Because each index of the color space in the spunbond nonwoven fabric is within the above numerical range, it is possible to create a composite nonwoven wiper with excellent visibility.

[0027] Furthermore, when the surface of the pulp fiber web in the composite nonwoven fabric is represented in the color space (CIELAB), L* = 80 or less, a* = -20 to -7, b* = -13 or less, and C* = 30 or more. Because each index of the color space on the surface of the pulp fiber web is within the above numerical range, a composite nonwoven wiper can be made with minimal difference in visibility between the front and back sides.

[0028] Furthermore, the color difference ΔE*ab between the pulp fiber web side and the spunbond nonwoven fabric side of the composite nonwoven fabric is 10 or less. Because the color difference is within the above numerical range, a composite nonwoven wiper with minimal difference in visibility between the front and back sides can be produced.

[0029] For color evaluation, a color difference meter PF7000 (manufactured by Nippon Denshoku Industries, Ltd.) was used. For spunbond nonwoven fabrics, 16 layers were stacked and measured before integration, while for composite nonwoven fabrics, 4 layers were stacked and measured after integration.

[0030] <Method for manufacturing composite nonwoven wipers> There are no particular limitations on the manufacturing method of the composite nonwoven wiper according to this embodiment, and it can be manufactured by known methods for manufacturing nonwoven wipers. Such manufacturing methods may include steps such as (1) manufacturing of composite nonwoven fabric, (2) cutting, and (3) packaging, but other steps may be added.

[0031] In the manufacturing of the composite nonwoven fabric described in (1), the method of laminating a pulp fiber web onto a colored spunbond nonwoven fabric and then integrating them may be a general method such as the spunlace method, but from the viewpoint of water absorption performance and abrasion resistance, water flow entanglement is preferred. The process of integration by water flow entanglement is described in detail, for example, in Japanese Patent Publication No. 6758116. Furthermore, in the manufacturing of the composite nonwoven fabric described in (1), the forming section is preferably an airlaid method, and the drying section is preferably a through-air dryer. Compared to the wet method (pulp fiber sheet), the airlaid method results in fewer bonds between pulp fibers, which allows the pulp fibers to scatter during water entanglement treatment and spunlace treatment, making it easier for the spunbond layer to be exposed on the surface, thus reducing the difference in color between the front and back sides.

[0032] The thickness of the manufactured composite nonwoven wiper is not particularly limited, but is preferably 0.25 mm / ply or more and 0.45 mm / ply or less, and more preferably 0.30 mm / ply or more and 0.40 mm / ply or less. The thickness was measured using a Peacock paper thickness gauge at 37.85 gf / m². 2 Measured at [location / location].

[0033] Based on the above, the invention according to this embodiment provides a composite nonwoven fabric wiper that has high visibility on both sides, excellent water absorption performance and abrasion resistance, and minimal fiber shedding in water. [Examples]

[0034] The present invention will be described in more detail by the following examples and comparative examples, but the present invention is not limited in any way by the following examples.

[0035] Under the conditions shown in Table 1, the composite nonwoven wipers of Examples 1-5 and Comparative Examples 1-6 were prepared and then evaluated as follows. In all examples and comparative examples, the base material was a composite nonwoven fabric formed by laminating a pulp fiber web onto a spunbond nonwoven fabric containing polypropylene as a synthetic fiber, and then integrating them by water entanglement. The spunbond nonwoven fabric was blue in color.

[0036] 1. Ease of use (ease of wiping) The ease of wiping away dirt and other objects with the wiper was evaluated on a 5-point scale. Each evaluation was based on the following criteria: "3" for products with no problems in terms of flexibility and water absorption during use, and a good wiping feel; "4" for products that are slightly better than this; "5" for products that are excellent; "2" for products that are slightly worse than this; and "1" for products that are poor.

[0037] 2.Water absorption performance The water absorption capacity when wiping away moisture with a wiper was evaluated on a 5-point scale. Each evaluation was based on the following criteria: "3" for no problems with water absorption capacity (water absorption rate, water absorption amount) in use, "4" for slightly better, "5" for better, "2" for slightly worse, and "1" for worse.

[0038] 3. Strength (fallen paper powder) The amount of paper dust detached when wiping with a wiper was evaluated on a 5-point scale. Each evaluation was rated as follows: "3" for an acceptable amount of paper dust shed during use, "4" for slightly less than that, "5" for less, "2" for slightly more than that, and "1" for more.

[0039] 4. Strength (tearability) The likelihood of tearing when wiped with a wiper was evaluated on a 5-point scale. Each evaluation was based on the following criteria: "3" for no tearing issues during use, "4" for slightly more tear-resistant, "5" for tear-resistant, "2" for slightly more tear-resistant, and "1" for easily tearable.

[0040] 5. Color (blueness) We evaluated the color of the pulp fiber web surface of wipers and surveyed 20 people to determine whether they perceived blue or white more strongly. For each evaluation, a rating of "3" was given to those with 15 to 17 people who answered that they strongly felt the color blue, a rating of "4" for those with 18 to 19 people, a rating of "5" for those with 20 people, a rating of "2" for those with 10 to 14 people, and a rating of "1" for those with 9 people or less.

[0041] Table 1 shows the conditions and evaluation results for Examples 1-5 and Comparative Examples 1-6. If each evaluation score is 3 or higher, the product is acceptable. [Table 1]

[0042] Based on the above, it has been confirmed that this embodiment provides a composite nonwoven wiper that has high visibility on both sides, excellent water absorption and abrasion resistance, and minimal fiber shedding in water.

Claims

1. A composite nonwoven fabric wiper, in which a pulp fiber web is laminated and integrated onto a colored spunbond nonwoven fabric, The basis weight of the aforementioned composite nonwoven fabric is 45.0 g / m². ２ 85.0g / m or more ２ The following conditions apply: the proportion of the spunbond nonwoven fabric is 15% by weight or more and 30% by weight or less; the proportion of the pulp fiber web is 70% by weight or more and 85% by weight or less. When the color of the aforementioned spunbond nonwoven fabric is expressed in the color space (CIELAB), L* = 65 or less, a* = -30 or more and -10 or less, b* = -30 or less, and C* = 30 or more. When the surface of the pulp fiber web in the composite nonwoven fabric is represented in the color space (CIELAB), L* = 80 or less, a* = -20 or more and -7 or less, b* = -13 or less, and C* = 16.5 or more. A composite nonwoven fabric wiper characterized in that the color difference ΔE*ab between the pulp fiber web surface and the spunbond nonwoven fabric surface in the composite nonwoven fabric is 10 or less.

2. The composite nonwoven fabric has a water absorption rate of 2.5 seconds or less and a water absorption capacity (T.W.A.) of 300 g / m². ２ The composite nonwoven fabric wiper according to claim 1, characterized in that the Wet Taber value is 6 or more.

3. The spunbond nonwoven fabric includes a plurality of fusion points connecting spun resin fibers, with each fusion point having an area of ​​0.10 mm². ２ 0.50 mm ２ The following conditions apply: the area ratio of the fusion points in the spunbond nonwoven fabric is 7% or more and 20% or less; and the number of fusion points per unit area in the spunbond nonwoven fabric is 10 points / cm². ２ More than 150 pieces / cm ２ The following: The spunbond nonwoven fabric contains one or more synthetic fibers selected from the group consisting of nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, and polystyrene. The composite nonwoven wiper according to claim 1, characterized in that the pulp fiber web contains fibers of one or more softwood bleached kraft pulp selected from the group consisting of radiata pine, slush pine, southern pine, lodgepole pine, spruce, and Douglas fir.

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