JPH11247063A - Highly water-absorbing nonwoven fabric for wiping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a highly water-absorbing nonwoven fabric for wiping use, capable of keeping a large amount of water and having high wet strength to prevent the breakage of the fabric even by severely wiping in wet state by using a laminate composed of a cheese cloth at the intermediate layer and hydrophilic fiber layers at the top and bottom outer layers. SOLUTION: A spun lace nonwoven fabric having a three-layer structure and an areal density of 100-150 g/m<2> is produced by placing nonwoven fabrics composed of a hydrophilic fiber such as rayon fiber at the top and bottom outer layers and a rayon cheese cloth having an areal density of 10-50 g/m<2> at the intermediate layer. The hydrophilic fiber layers placed at the outer layers contribute to the high water-absorption and the cheese cloth at the intermediate layer contributes to the excellent wet strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonwoven fabric for wiping which is suitably used for industrial wipes, countercloths, household tablecloths, dishware, placemats, towels and the like.

[0002]

2. Description of the Related Art Fabrics such as cotton and rayon have been mainly used for wiping cloths such as industrial wipes, countercloths, household tablecloths, dishware, placemats, and towels.

However, in recent years, nonwoven fabrics that can be manufactured at low cost have been used for similar applications.
Here, Table 1 below shows the suitability for a wiping substrate according to the difference in the nonwoven fabric manufacturing method.

[0004]

[Table 1]

It is necessary to use hydrophilic cotton or rayon fiber for the purpose of securing water absorption, and it is desirable not to use a hydrophobic adhesive or the like for the nonwoven fabric for the above-mentioned use. Also,
Since a certain thickness is required to absorb a large amount of water, among the nonwoven fabrics formed by mechanical bonding, non-woven fabrics of the spunlace method, which are particularly inexpensive, have been used.

[0006] In the nonwoven fabric manufacturing by spunlace method is hydroentangled processed by conventional 100 kg / cm ² or less of water pressure, at the case 100 g / m ² or more basis weight of rayon fibers, weakens the degree of entanglement of fibers In addition, since the strength, particularly the wet strength, is reduced, water absorption may cause the mold to lose its shape or break. Thus, most products have a basis weight of 80 g / m ² or less. However, with this basis weight, it was not possible to absorb water as much as a conventional woven cloth substrate having a basis weight of about 140 g / m ² .

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is capable of absorbing a large amount of water and having a high wet strength. It is an object of the present invention to provide an inexpensive nonwoven fabric for high-absorbency wiping which does not break or break.

[0008]

According to the present invention, there is provided a spunlace nonwoven fabric having a three-layer structure comprising a cold gauze serving as an intermediate layer and a hydrophilic fiber layer forming an outer layer. It has the structure of a nonwoven fabric for water absorbent wiping. In the present invention, the basis weight of the middle layer cold gauze is 10 g /
It is preferred in m ² or more is less than 50 g / m ^2. When the basis weight of the entire nonwoven fabric is 100 g / m ² or more, 150 g
/ M ² or less.

According to the superabsorbent nonwoven fabric of the present invention,
Since cold gauze is used for the middle layer, the overall wet strength is higher than that of a nonwoven fabric consisting of only hydrophilic fibers due to its own strength. In addition, the cold gauze itself has a large space between the yarns, so that it is difficult to hinder the upper and lower fiber webs from being entangled by the water current, and the upper and lower fibers can be entangled with each other, for example, in the middle layer. If the basis weight of a certain cold gauze is 10 g / m ² or more, the strength of itself will be improved, and the wet strength of the entire nonwoven fabric will surely increase. In addition, the cold gauze itself has a large space between the yarns, and if the basis weight is less than 50 g / m ² , it is even less likely to hinder the upper and lower fiber webs from being entangled by the water flow, and Since the upper and lower fibers can be entangled with each other, the fibers are less fuzzy, and the nonwoven fabric can be integrated, which is suitable for improving the strength.

On the other hand, since the outer layer is a hydrophilic fiber layer, a large amount of water can be contained as a whole due to its water absorption. In this case, if the basis weight of the nonwoven fabric itself is 100 g / m ² or more, a large amount of water can be reliably contained in the nonwoven fabric.
When the basis weight is 150 g / m ² or less, the entanglement due to the water flow is sufficiently formed, so that the fluffing of the fibers can be reduced.

[0011]

An embodiment of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, the nonwoven fabric for superabsorbent water wiping 1 according to the embodiment has a three-layer structure in which an upper layer and a lower layer of a middle layer 3 are sandwiched between an upper layer 2 and a lower layer 4.

The fibers used for the upper layer 2 and the lower layer 4 include:
It is selected from hydrophilic fibers such as rayon, cupra, pulp, cotton, acrylic and polyester. In addition, a quaternary ammonium salt, a polycarboxylic acid, or a material obtained by kneading an antibacterial agent such as chitin or chitosan into these fibers can be used. The above fibers may be used singly or as a mixture of a plurality of fiber types at an arbitrary ratio. The thickness and fiber length of the fibers are not particularly limited,
The following are good.

That is, the thickness of the fibers used is desirably 1 to 5 d (denier). This is because the smaller the fiber diameter, the softer the fiber itself, so that the entanglement between the fibers is improved and the texture when touched by hand is improved. In addition, the length of the fiber is required to be easily entangled between the fibers, and the upper and lower fiber webs need to be entangled with an intermediate cold gauze, so that the length is 10 mm or more, preferably 20 to 50 mm. desirable.

Further, in order to suppress fluffing of the surface of the nonwoven fabric, heat-fused fibers, for example, conjugate fibers in which polyethylene is disposed outside of polypropylene or polyester fibers are used in a range where water absorption is not reduced, that is, 20% or less of the whole nonwoven fabric fibers. It is possible to enhance the bonding between the fibers by heating the fibers to the melting point or higher at the time of drying.

As for the cold gauze of the middle layer 3, it is desirable to use rayon or cotton fiber which is a hydrophilic fiber. Also,
Its basis weight is preferably set to 10 g / m ² or more 50 g / m less than ^2. If the basis weight is less than 10 g / m ² , sufficient strength cannot be obtained. On the other hand, if it is 50 g / m ² or more, the fiber webs of the upper and lower layers cannot be integrated with each other, so that the layers can be easily separated. Furthermore, preferably 20 to 30 g / m ²
Is desirably within the range.

Hereinafter, the present invention will be described specifically with reference to Examples and Comparative Examples, but the present invention is not limited to the following. The sample was adjusted by the following method. Table 2 and Table 3 using a test roller card machine (30 cm width)
Make a fiber web. Each cold gauze was put between the webs and supplied to a test conveyer type water needling device. The first (front) 40 kg / cm ² , the second (back) 80 k
A spunlace nonwoven fabric was produced by applying a water pressure of g / cm ² and drying with a drum dryer at 130 ° C.

The test methods in the examples were performed as follows. 1. Water absorption Larose method: The saturated water absorption of a 9 cm ² sample is measured using a contact water absorption tester. It was converted to g per 1 m ² and described. (Another method of measuring the amount of water absorption is shown in parentheses.) Measurement method: Samples and utensils were stored in a constant temperature room at a temperature of 25 ° C. and a humidity of 65% for 24 hours or more, and then subjected to measurement. Pour distilled water into a vat large enough to immerse the sheet,
A sheet of known weight and area was immersed for 3 minutes. Then, the sheet was allowed to stand on a 10-mesh wire net and drained for 1 minute, weighed, and the difference from the initial weight was divided by the area of the sheet to convert the amount of water absorbed per 1 m ² . The measurement was performed five times and the average value was obtained.

2. Strength The strength was measured according to JIS P8113 (test method for tensile strength of paper and paperboard) and JIS P8135 (test method for wet tensile strength of paper and paperboard). However, the width of the test piece was 250 mm. In the table, MD indicates the machine flow direction, and CD indicates the value when a test piece was cut out in a direction perpendicular thereto.

3. Shape retention when wet The sample was cut into a rectangle so as to be 40 cm in the machine direction and 30 cm in the right angle direction. The sample was lightly hand-washed 10 times in a water tank and then squeezed 5 times. The state of the later deflection was visually determined. ：: State of little deformation △: State of slight deformation ×: State of large deformation that makes further use impossible

(Examples 1 to 6, Comparative Example (1)) Materials used: upper and lower layer rayon fiber 1.5d, 27mm middle layer rayon cold gauze

[0021]

[Table 2]

[0022]

[Table 3]

Based on the results shown in Tables 2 and 3,
The usefulness of the present invention will be described in detail. It can be seen that Examples 1-3 have a sufficient amount of water absorption as compared with the conventional woven fabric (Comparative Example 5). If the basis weight of the entire nonwoven fabric is less than 100 g / m ² as in Example 6, there is a tendency that a sufficient absorption amount cannot be achieved. Further, from Examples 1 and 2 and Comparative Example 1, it can be seen that the middle layer cold gauze contributes to improvement in strength. The strength of the cold gauze increases as the grammage increases, and if it is less than 10 g / m ² , sufficient strength tends not to be secured (Example 4). On the other hand, if the basis weight of the middle layer is too large, the effect of simply increasing the basis weight of the cold gauze may not be expected because the upper and lower layers do not become entangled with the rayon gauze of the middle layer as in Example 5. This is presumably because the eyes of the cold gauze were too clogged and the fibers of the upper and lower layers could not be sufficiently integrated.

As described above, according to the present invention, a spunlace nonwoven fabric having a three-layer structure consisting of a cold gauze serving as an intermediate layer and a fiber layer forming an outer layer is provided. The basis weight of the cold gauze of the middle layer is preferably 10 g.
/ M ² or more and less than 50 g / m ² and the basis weight of the entire nonwoven fabric is preferably 100 g / m ² or more and 150 g / m ² , so that the nonwoven fabric has a sufficient water absorption and excellent strength. Can be.

[0025]

As described above, according to the present invention, a large amount of water can be absorbed by the outer hydrophilic fiber layer,
The cold gauze in the middle layer increases the wet strength, so it won't break or break even if you wipe it strongly when wet.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating one embodiment of the nonwoven fabric for superabsorbent wiping of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nonwoven fabric for superabsorbent wiping 2 Upper layer 3 Middle layer 4 Lower layer

Claims (1)

[Claims] 1. A highly water-absorbent wiping nonwoven fabric which is a spunlace nonwoven fabric having a three-layer structure comprising a cold gauze serving as a middle layer and a hydrophilic fiber layer forming an outer layer.