Composite nonwoven wiper

Abstract

To provide a colored conjugate type nonwoven fabric wiper that has water absorptive performance even in low basis weight and soft tactile and wiping feeling even when executing wiping work in a dry state, and allows wiping work with soft tactile even if the wiper is damped with a liquid.SOLUTION: A conjugate type nonwoven fabric wiper formed by integrally stacking a pulp fiber web on a colored spunbonded nonwoven fabric. Basis weight of the conjugate type nonwoven fabric is 30 g / m2 or more and 60 g / m2 or less. The conjugate type nonwoven fabric wiper in a dry state has tensile strength in lengthwise direction of 9.8 N / 25 mm or more and 19.6 N / 25 mm or less and tensile strength in traverse direction of 4.9 N / 25 mm or more and 12.7 N / 25 mm or less. The conjugate type nonwoven fabric wiper in a wet state has the tensile strength in lengthwise direction of 7.8 N / 25 mm or more and 19.6 N / 25 mm or less and tensile strength in traverse direction of 2.9 N / 25 mm or more and 12.7 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, when wiping the surfaces of machines, devices, and utensils used in manufacturing, processing, treating, and cooking food, or the hands of workers, paper wipers containing pulp fiber webs or nonwoven wipers containing synthetic fibers may be used.

[0003] On the other hand, 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] In addition to the above-mentioned composite nonwoven fabric, 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] Such colored wipers are not only suitable for wiping food but also for industrial purposes such as wiping bicycles and machinery, making them highly convenient for use depending on the object. Furthermore, with the recent rise in awareness of hygiene, wipers are increasingly being used as disposable wipers or only a few times.

[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] However, when using conventional composite nonwoven fabrics to wipe off light stains or moisture, if the strength is too high, the softness is inferior due to the characteristics of the material, making wiping difficult.

[0010] Furthermore, in the case of disposable wipers or wipers that are used only a few times, the number of wipers used is large, so it is necessary to reduce the unit cost of the wipers. One way to keep unit costs down is to reduce the basis weight (unit weight) and limit the amount of raw materials used, but this would reduce the liquid absorption performance, which is essential for wipers, and would also make the wiping experience worse.

[0011] The present invention has been made in view of the above circumstances, and aims to provide a colored composite nonwoven fabric wiper that has water absorption performance even with a low basis weight, provides a soft feel and wiping sensation when wiping in a dry state, and allows wiping with a soft feel 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 onto it, by adjusting the basis weights of the composite nonwoven fabric, the spunbond nonwoven fabric, and the pulp fiber web within predetermined ranges, and by adjusting the tensile strengths of the composite nonwoven fabric in both the machine direction and the cross direction when dry and the machine direction and the cross direction when wet, within predetermined ranges, a colored composite nonwoven wiper can be obtained that has water absorption performance even at a low basis weight, provides a soft feel and comfort when wiping in a dry state, and provides a soft feel when wet with liquid, thereby achieving 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 30 g / m 2 More than 60g / m 2 Hereinafter, the basis weight of the spunbond nonwoven fabric is 8 g / m 2 More than 14g / m 2 Hereinafter, the basis weight of the pulp fiber web is 20 g / m 2 More than 50g / m 2the composite nonwoven fabric has a dry longitudinal tensile strength of 9.8 N / 25 mm or more and 19.6 N / 25 mm or less and a dry transverse tensile strength of 4.9 N / 25 mm or more and 12.7 N / 25 mm or less, and the wet composite nonwoven fabric has a wet longitudinal tensile strength of 7.8 N / 25 mm or more and 19.6 N / 25 mm or less and a wet transverse tensile strength of 2.9 N / 25 mm or more and 12.7 N / 25 mm or less.

[0014] (2) The second aspect of the present invention is the composite nonwoven fabric wiper according to (1), wherein the thickness of the composite nonwoven fabric is 0.25 mm or more, the water absorption speed is 2.0 seconds or less, and the water absorption per unit area (TWA) is 240 g / m 2 The present invention is characterized by the above.

[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 7.8 N / 25 mm or more and 14.7 N / 25 mm or less, and a tensile strength in the cross direction when dry of 2.9 N / 25 mm or more and 9.3 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 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 2The 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, it is possible to provide a colored composite nonwoven fabric wiper that has water absorption performance even with a low basis weight, has a soft feel and wiping sensation when used for wiping in a dry state, and allows 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 Over 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 with little fiber shedding in water can be obtained. 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 preferably 14% by weight to 41% by weight, and the proportion of the pulp fiber web is preferably 59% by weight to 86% by weight. By having each proportion within the above ranges, the composite nonwoven fabric wiper can have excellent water absorption performance and maintain softness both in dry and wet conditions. The lower limit of the proportion of spunbond nonwoven fabric is more preferably 17% by weight or more, and even more preferably 19% by weight or more. The upper limit is more preferably 31% by weight or less, and even more preferably 29% by weight or less. The lower limit of the proportion of pulp fiber web is more preferably 69% by weight or more, and even more preferably 71% by weight or more. The upper limit is more preferably 83% by weight or less, and even more preferably 81% by weight or less.

[0024] (Physical Properties) The lower limit of the basis weight of the composite nonwoven fabric according to this embodiment is 30 g / m 2 More preferably, 38 g / m 2 More preferably, it is 45 g / m or more. 2 The upper limit is 60 g / m 2 or less, preferably 52 g / m 2 More preferably, it is 50 g / m or less. 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 can maintain softness both in dry and wet conditions.

[0025] The minimum basis weight of spunbond nonwoven fabric is 8 g / m 2 More preferably, 9 g / m 2 More preferably, it is 10 g / m or more. 2 The upper limit is 14 g / m 2 or less, preferably 13 g / m 2 or less, more preferably 12 g / m 2 When 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 should be less than 20 g / m 2 More preferably, 30 g / m 2 More preferably, it is 35 g / m or more. 2 The upper limit is 50 g / m2 and preferably 45 g / m 2 More preferably, it is 40 g / m or less. 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 lower limit of the dry longitudinal tensile strength of the composite nonwoven fabric according to this embodiment is 9.8 N / 25 mm or more, preferably 13.0 N / 25 mm or more, and more preferably 15.0 N / 25 mm or more, and the upper limit is 19.6 N / 25 mm or less, preferably 19.0 N / 25 mm or less, and more preferably 18.0 N / 25 mm or less. Similarly, the lower limit of the tensile strength in the cross direction when dry for the composite nonwoven fabric is 4.9 N / 25 mm or more, preferably 5.5 N / 25 mm or more, and more preferably 6.0 N / 25 mm or more. The upper limit is 12.7 N / 25 mm or less, preferably 10.0 N / 25 mm or less, and more preferably 8.5 N / 25 mm or less. When the tensile strength in each direction when dry is within the above numerical range, the composite nonwoven fabric wiper can have excellent water absorption performance and a comfortable wiping experience.

[0028] The lower limit of the tensile strength in the machine direction of the spunbonded nonwoven fabric in a dry state is preferably 7.8 N / 25 mm or more, more preferably 8.5 N / 25 mm or more, and even more preferably 9.0 N / 25 mm or more, and the upper limit is preferably 14.7 N / 25 mm or less, more preferably 13.5 N / 25 mm or less, and even more preferably 12.5 N / 25 mm or less. Similarly, the lower limit of the tensile strength in the cross direction when dry for a spunbond nonwoven fabric is preferably 2.9 N / 25 mm or more, more preferably 3.5 N / 25 mm or more, and even more preferably 4.0 N / 25 mm or more. The upper limit is preferably 9.3 N / 25 mm or less, more preferably 8.5 N / 25 mm or less, and even more preferably 8.0 N / 25 mm or less. When the tensile strength in each direction when dry is within the above numerical ranges, a composite nonwoven fabric wiper with excellent water absorption performance and a comfortable wiping experience can be obtained.

[0029] The tensile strength in each direction of the composite nonwoven fabric and the spunbond nonwoven fabric when dry is measured in accordance with JIS P 8113. The tensile strength of the spunbond nonwoven fabric is measured individually before being laminated and integrated.

[0030] The lower limit of the wet longitudinal tensile strength of the composite nonwoven fabric according to this embodiment is 7.8 N / 25 mm or more, preferably 12.0 N / 25 mm or more, and more preferably 13.8 N / 25 mm or more, and the upper limit is 19.6 N / 25 mm or less, preferably 17.5 N / 25 mm or less, and more preferably 16.6 N / 25 mm or less. Similarly, the lower limit of the wet lateral tensile strength of the composite nonwoven fabric is 2.9 N / 25 mm or more, preferably 5.1 N / 25 mm or more, and more preferably 5.5 N / 25 mm or more. The upper limit is 12.7 N / 25 mm or less, preferably 9.2 N / 25 mm or less, and more preferably 7.8 N / 25 mm or less. When the wet tensile strengths in each direction are within the above numerical ranges, the composite nonwoven fabric wiper can have excellent water absorption performance and a comfortable wiping experience.

[0031] The tensile strength of the composite nonwoven fabric in each direction when wet is measured in accordance with JIS P 8135-1998. In the measurement of the dry and wet tensile strengths, the machine direction refers to the machine direction of the composite nonwoven fabric / spunbond nonwoven fabric, and the cross direction refers to the width direction of the composite nonwoven fabric / spunbond nonwoven fabric.

[0032] The thickness of the composite nonwoven fabric is preferably 0.25 mm or more, more preferably 0.31 mm or more, and even more preferably 0.34 mm or more. By having the thickness within the above numerical range, the composite nonwoven fabric wiper can have excellent water absorption performance and can maintain softness both in dry and wet conditions. The thickness is 37.85gf / m using a Peacock paper thickness gauge. 2 Measured at.

[0033] (Water absorption performance) The water absorption rate of the composite nonwoven fabric is preferably 2.0 seconds or less, and more preferably 1.5 seconds or less. When the water absorption rate is 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.

[0034] Furthermore, the total water absorption per unit area (TWA) of the composite nonwoven fabric is 240 g / m 2 It is preferable that the weight is 280 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.

[0035] <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.

[0036] 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.

[0037] As described above, according to the present embodiment of the invention, it is possible to provide a colored composite nonwoven fabric wiper that has water absorption performance even when it has a low basis weight, has a soft feel and wiping comfort even when used for wiping in a dry state, and can also be used for wiping with a soft feel when wet with liquid. [Example]

[0038] 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.

[0039] Composite nonwoven fabric wipers for each of Examples 1 to 6 and Comparative Examples 1 to 8 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).

[0040] 1. Usability (ease of wiping) The ease of wiping off dirt and other objects with the wiper was evaluated on a 5-point scale. For each evaluation, a "3" was given to a cloth that had no problems with flexibility or absorbency and was comfortable to wipe with, a "4" was given to a cloth that was slightly better than this, a "5" was given to a cloth that was excellent, a "2" was given to a cloth that was slightly worse than this, and a "1" was given to a cloth that was poor.

[0041] 2.Water absorption performance The water absorption ability when wiping off water with a wiper was rated 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.

[0042] 3. Softness The softness of the wiper when wiping was evaluated on a 5-point scale. The ratings were as follows: moderate softness with no problems in use was given a "3", slightly softer was given a "4", softer was given a "5", slightly harder was given a "2", and hard was given a "1".

[0043] 4. 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.

[0044] 5. 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.

[0045] Table 1 shows the conditions and evaluation results for Examples 1 to 6 and Comparative Examples 1 to 8. When each evaluation was 3 or more or ◯, the product was acceptable. [Table 1]

[0046] From the above, it was confirmed that this example provides a colored composite nonwoven fabric wiper that has water absorption performance even at a low basis weight, provides a soft feel and wiping sensation when used for wiping in a dry state, and allows 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 30 g / m ２ 60g / m or more ２ Hereinafter, the basis weight of the spunbond nonwoven fabric is 8 g / m ２ 14g / m or more ２ Hereinafter, the basis weight of the pulp fiber web is 20 g / m ２ 50g / m or more ２ is as follows: The composite nonwoven fabric has a tensile strength in the machine direction when dry of 9.8 N / 25 mm or more and 19.6 N / 25 mm or less, and a tensile strength in the cross direction when dry of 4.9 N / 25 mm or more and 12.7 N / 25 mm or less, A composite nonwoven fabric wiper, characterized in that the composite nonwoven fabric has a tensile strength in the machine direction when wet of 7.8 N / 25 mm or more and 19.6 N / 25 mm or less, and a tensile strength in the cross direction when wet of 2.9 N / 25 mm or more and 12.7 N / 25 mm or less.

2. The composite nonwoven fabric has a thickness of 0.25 mm or more, a water absorption rate of 2.0 seconds or less, and a water absorption amount per unit area (T.W.A.) of 240 g / m ２ 2. The composite nonwoven fabric wiper according to claim 1, wherein:

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 7.8 N / 25 mm or more and 14.7 N / 25 mm or less, and a tensile strength in the cross direction when dry of 2.9 N / 25 mm or more and 9.3 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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