KR940010902B1 - Composite non-woven fabrics - Google Patents

Abstract

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Description

Composite nonwoven fabric

1 is an electron micrograph of a cross-sectional view of an example of a composite nonwoven fabric according to the present invention.

2 is a schematic cross-sectional view of the composite nonwoven fabric shown in FIG.

3 is a schematic cross-sectional view of a conventional composite nonwoven fabric.

FIG. 4 is the same as the schematic cross sectional view of the composite nonwoven fabric of FIG. 2 except for adding the standard lines X ₀ and Y ₀ .

5 is a diagram for defining a linear component for measuring the average orientation degree (Z) of fibers.

6 is a graph showing the relationship between the average orientation of artificial fibers and the water resistance of nonwoven fabrics.

The present invention relates to a nonwoven fabric excellent in breathability and water resistance that can be used in surgical clothing, diapers, filters and the like.

As the use of nonwovens has diversified, various characteristics have been required for nonwovens. One such need is good breathability and water resistance. In essence, breathability is in contrast to water resistance. In order to improve air permeability, it is necessary to provide a lot of holes from the front to the back of the nonwoven fabric, but if the air permeability is improved, water resistance is inevitably deteriorated.

The use of nonwovens for medical applications, such as surgical clothing, requires better bacterial barrier. That is, better water resistance is needed to protect against infection. In addition, blood should not penetrate the nonwoven fabric if it is deformed or the clothing contracts when it is bent. On the other hand, good ventilation is required to minimize expression and not to accumulate moisture.

There has been a proposal to synthesize two different fabrics to meet these two contrasting properties, namely breathability and water resistance.

For example, Japanese Patent Laid-Open Publication No. 64-61555 discloses a paper-based composite of a water jet stream on a knitted fabric in which a dispersion containing two kinds of artificial fibers having different finenesses is woven with strong shrinkage and sufficiently mixed with artificial fibers. A technique for making a sheet is disclosed. This composite sheet has excellent breathability but poor water resistance.

Japanese Laid-Open Patent Publication No. 1-111056 discloses a composite nonwoven fabric containing a nonwoven fabric made of pulp and artificial fibers and a filament nonwoven fabric. Although this composite nonwoven can be used for surgical applications, its water resistance does not seem to be sufficiently improved.

The nonwoven can cause liquid leakage upon bending or compression.

It is an object of the present invention to provide a nonwoven fabric having sufficient breathability and water resistance, little liquid leakage upon bending or deformation due to compression, and excellent strength and flexibility.

The object of the present invention can be achieved by a composite nonwoven fabric comprising (A) an artificial fibrous nonwoven fabric having the following components (1) to (3) and a filament nonwoven fabric formed so that the (B) filaments are partially interlinked, wherein A part of the artificial fibers constituting the artificial fiber nonwoven fabric (A) is inserted into the filament nonwoven fabric (B) and mixed with the filaments constituting the filament nonwoven fabric (B) to form a laminate of the artificial fiber nonwoven fabric (A) and the filament nonwoven fabric (B). The number N of artificial fibers produced and inserted to a depth not less than 1/2 of the thickness of the filament nonwoven fabric B in an area of 500 μm length in any cross section of the composite nonwoven fabric is 20 or less;

(1) F + G≥50 wt%

1 / 7≤F / G≤4 / 3

(Wherein F is a ratio of artificial fibers having a fineness of 0.3 denier or less in total artificial fibers; G is a ratio of artificial fibers having a fineness of 0.5 denier or more in all artificial fibers)

(2) Weight per unit area of artificial fiber: 10g / ㎡ ~ 40g / ㎡

(3) Average orientation degree: 2.0-10.

The invention is described below with reference to the accompanying drawings which show an example of a composite nonwoven fabric according to the invention.

1 is an electron micrograph of a cross-sectional view of an example of a composite nonwoven fabric according to the present invention, and FIG. 2 is a schematic cross-sectional view of the composite nonwoven fabric shown in FIG. 3 is a schematic cross-sectional view of a conventional composite nonwoven fabric. As shown in Figs. 1 and 2, the composite nonwoven fabrics are made of artificial fiber nonwoven fabric A and filament nonwoven fabric B comprising artificial fibers 11 having a fineness of 0.3 denier or less and artificial fibers 12 having a fineness of 0.5 denier or more. Is made of. A plurality of man-made fibers in man-made fiber nonwoven fabric A are arranged in a plane relatively parallel to the surface of the composite nonwoven fabric, and the man-made fibers of the man-made fiber nonwoven fabric A and the filaments of the filament nonwoven fabric are only interwoven at the interface between them, The fibers are not deeply inserted into filament nonwoven fabric B. In the conventional composite nonwoven fabric shown in FIG. 3, the artificial fibers 21 constituting the artificial fiber nonwoven fabric C are inserted deeply into the filament fiber nonwoven fabric D by a columnar liquid stream under high pressure so that the artificial fibers 21 are composed of the filament 22 and the filament nonwoven fabric. Mix well Thus, the composite nonwoven fabric shown in FIG. 3 is formed by two nonwoven fabrics, but the obtained composite nonwoven fabric has an appearance similar to that of a single nonwoven fabric formed by mixing artificial fiber 21 with filament 22.

The first feature of the composite nonwoven fabric according to the present invention is the sum of the ratio F of artificial fibers having a fineness of 0.3 denier or less and the ratio G of artificial fibers having a fineness of 0.5 denier or more is 50% by weight or more of the artificial fiber nonwoven A, The ratio of F / G is 1/7 or more and 4/3 or less, and the weight per unit area of artificial fiber nonwoven fabric A is 10-40 g / m <2>. The fineness of the man-made fiber 11 is 0.3 denier or less, preferably 0,001 denier or more and 0,15 denier or less. It is not necessary for all artificial fibers 11 to have the same fineness, and the artificial fibers 11 are obtained by fiber cutting, such as sea component removal from sea island fibers, separation or splitting of composite fibers having two or more components, or ultrafine fibers obtained by diameter spinning or the like. It can be produced by fibers. The fineness of the man-made fiber 12 is at least 0.5 deniers, preferably at least 0.75 deniers and at most 10 deniers. It is not necessary for all the fibers 12 to have the same fineness, and the fiber length of the fibers 11 and 12 is preferably greater than the thickness of the composite nonwoven fabric, but the fibers 11 and 12 do not have to have the same fiber length. .

The artificial fiber 11 is geared to improve the water resistance of the composite nonwoven fabric, but when the content of the artificial fiber 11 in all the artificial fibers of the artificial fiber nonwoven fabric A increases, the air permeability decreases. Artificial fiber 12 has a dysfunctional function for artificial fiber 11. Therefore, when the F / G is 1/7 or more and 4/3 or less, the artificial fibers 11 and 12 have an excellent balance, so that the composite nonwoven fabric obtains excellent breathability without deteriorating water resistance. However, the content of F and G is more than 50% by weight, it is difficult to obtain a good effect if the sum of F and G is less than 50% by weight. It is preferable that the sum of F and G is 70 weight% or more.

The weight per unit area needs to be 10 g / m 2 or more and 40 g / m 2 or less. When the weight per unit area is more than 40 g / m 2, the breathability of the composite nonwoven fabric is lowered. When the weight per unit area is less than 10 g / m 2, the water resistance of the composite nonwoven fabric is lowered.

The appearance density of the artificial fiber nonwoven fabric A is preferably 0.1 g / m 2 in order to improve the water resistance of the composite nonwoven fabric. The apparent density measurement method of the nonwoven fabric is described below.

The second characteristic of the composite nonwoven is that the average fiber orientation degree Z of artificial fiber nonwoven A is 2.0 or more and 10 or less. The average degree of orientation Z is a value representing the ratio between the components parallel to the surface of the filament nonwoven fabric B and the component perpendicular to the surface of the artificial fiber nonwoven fabric B of the artificial fiber nonwoven fabric A. The measuring method of average orientation degree is described below.

The inventors have found that the liquid leakage caused by deformation caused by bending and shrinking forces on the composite nonwoven fabric depends on the value of the average orientation degree Z. 6 is a graph showing the relationship between the average orientation of artificial fibers and the water resistance of nonwoven fabrics. As can be seen from the graph of FIG. 6, there is a clear linear correlation between the average orientation degree of the man-made fibers Z and the water resistance of the nonwoven fabric having the same composition and weight per unit area. Even if bending or shrinking force is applied to the composite nonwoven fabric, the liquid leakage is effectively prevented to produce a composite nonwoven fabric having excellent water resistance. When the average orientation degree Z is more than 10, the entanglement between the artificial fibers constituting the artificial fiber nonwoven fabric A and the entanglement between the artificial fiber nonwoven fabric A and the filament nonwoven fabric B is reduced to produce a composite nonwoven fabric having a weak strength.

Therefore, it is necessary to set average orientation degree to 2.0-10, Preferably 2.3-10, More preferably, it is 2.5-8.0.

A third feature of the composite nonwoven fabric according to the invention is that the number N of artificial fibers inserted to a depth of at least half the thickness of the filament nonwoven fabric B in an area of 500 μm length in any cross section of the composite nonwoven fabric is 20 or less. The measurement method of the number N is described below. When the number N is more than 20, the water resistance of the composite nonwoven fabric is lowered.

As mentioned above, the object of the present invention can be achieved by combining artificial fiber nonwoven A having a specific component with filament nonwoven B.

The nonwoven fabric produced by the spunbond method can be used as the filament nonwoven fabric B. The filaments constituting the filament nonwoven fabric B are partially bonded to each other by heat melting or adhesive use to fix the structure. Since the bonding portion of the filament nonwoven fabric B cannot be interwoven with the artificial fibers of the artificial fiber nonwoven fabric A, the area ratio of the total area of the bonding portion to the total surface area of the filament nonwoven fabric B is 2-20%, and the filament having a fineness of 0.5 denier It is preferable to use, and if the average elongation at break measured in two directions at right angles is 40% or less, the artificial fiber can easily adopt the above arrangement when weaving two nonwoven fabrics together.

Arbitrary fibers can be used for the composite nonwoven fabric according to the present invention. For example, thermoplastic fibers such as polyamide fibers, polyester fibers, polyolefin fibers, polyacrylonitrile fibers, acetate fibers, regenerated cellulose fibers, and the like can be used. In addition, if necessary, natural cellulose fibers, wool fibers, and the like can be used. When recycled cellulose fibers are used for artificial fiber nonwoven fabric A, holes generated by water jet streams and water jet streams used for interweaving processes are used. Since the traces of are easily removed, the water resistance can be prevented from deteriorating.

When polyester fibers are used in artificial fiber nonwoven fabric A, the entanglement between filament nonwoven fabric B and artificial fiber nonwoven fabric A is improved. Therefore, the use of polyester fibers having a ratio of 1/3 or more and 1 or less for grade 1 regenerated cellulose fibers enables the characterization to be obtained as a result of the use of regenerated cellulose fibers and polyester fibers.

In addition to artificial fibers having a fineness of 0.3 denier or less and artificial fibers having a fineness of 0.5 denier or more, 5 to 15% by weight of fibrillated pulp fibers are used for all the artificial fibers of the nonwoven fabric A. It is desirable to obtain a somewhat improved composite nonwoven fabric without lowering breathability. Fibrillated pulp fibers can be obtained by tapping natural pulp or fissile acrylic fibers.

The manufacturing method of the composite nonwoven fabric which concerns on this invention is described below.

Artificial fibers of 0.3 denier or less and artificial fibers of 0.5 denier or more are dispersed in water at a predetermined mixing ratio, and artificial fiber nonwoven fabric A is obtained as a papermaking dispersion.

In this case, it is preferable to add surfactant to the dispersion to improve the degree of dispersion of the fibers in water. Next, the filament nonwoven fabric B produced by the spunbond method is laminated on the artificial fiber nonwoven fabric A. The laminate can be produced by directly making artificial fibers constituting the artificial fiber nonwoven fabric A on the filament nonwoven fabric B.

The stack is integrated into a columnar stream. That is, 50-200 mesh wire mesh is arranged between the laminate and the nozzle installed on the wire mesh conveyor, and 50-200 mesh wire mesh is formed by the nozzle which rotates the water jet stream whose pressure is 30 kg / cm <2> or less at 50-100 rpm. Inject onto the laminate. Usually, the nozzle which has a some hole of 0.05-0.3 mm in diameter can be used. The average degree of orientation of the man-made fiber of man-made fiber nonwoven fabric A can be adjusted within the above-mentioned preferred range by inserting a wire mesh between the nozzle and the conveyor, rotating the nozzle appropriately, and adjusting the pressure of the nozzle to obtain a composite nonwoven fabric having excellent breathability and water resistance. can do.

It is also preferable to obtain a composite nonwoven fabric having good water resistance by subjecting the composite nonwoven fabric to a water repellent treatment. Known water repellents include silicone-based water repellents such as dimethylaminosilicone or fluorine-based water repellents such as perfluoroacrylate, and the accumulation solid ratio of the water repellent is preferably about 0.1 to 5% of the weight of the composite nonwoven fabric.

The measuring method for evaluating a composite nonwoven fabric according to the present invention is described below.

Method for measuring the average fiber orientation of artificial fiber nonwoven fabric A:

1. Cut a 20 cm square specimen from the composite fiber nonwoven fabric.

2. Cut 16 cm pieces of size square by cutting each 5 cm in the longitudinal and transverse directions of the test piece.

3. Randomly select 3 of 16 fragments.

4. An electron micrograph with a magnification of 100 is taken at the cross section of the selected fragment. At this time, six photomicrographs are prepared by taking the photomicrographs at the portion not having the partial bonding portion of the filament nonwoven fabric B at two adjacent surfaces of each fragment.

5. As shown in FIG. 4, the number of filament ends constituting the filament nonwoven fabric B of each electron micrograph is calculated at the external position distance from the surface of the filament nonwoven fabric B to the inside thereof, and the straight line X ₀ is the fourth end cross section. It is drawn from the center to the center of the fifth end section arranged at a distance of at least 300 μm from the fourth end. This line X ₀ represents a standard line of the composite nonwoven fabric. Another standard line Y ₀ is drawn perpendicular to the standard line X ₀ .

6. Two vertical lines in 5cm intervals Y ₁ Y ₂ is drawn in parallel with the reference line Y ₀ of the center portion of each of the electron micrograph.

7. Artificial fibers having a fineness of 0.3 denier or less and artificial fibers having a longitudinal length of 10 times the maximum diameter of the fiber and having a fineness of 0.5 denier or more are selected between the vertical lines Y ₁ and Y ₂ , respectively.

8. As shown in Fig. 5, P ₁ is an arbitrary point of the centrality L of the artificial fiber, the point P ₂ is selected on the center line L and the straight line P ₁ P ₂ connects the point P ₁ and the point P ₂ . At this time, the point P ₂ is a distance d between the straight line P ₁ P ₂ and the tangent P ' ₁ P' ₂ when the straight line P ' ₁ P' ₂ in contact with the centrality L is smaller than the diameter r of the fiber and the point P ₁ and point The length between P ₂ is determined to be at least four times the diameter r.

9. Other points P ₃ , P ₄ ... P _n are determined in the same way and the man-made fibers are separated into a plurality of straight lines. The determination of points P ₁ , P ₂ ... P _n is applied to all of the artificial fibers selected in step 7 above.

10. The component of the reference line in a direction parallel to the X ₀ X _n and a reference line parallel to a direction component of the Y ₀ Y _n are obtained by applying the scalar analysis on a separate line for each man-made fibers, X _n and Y _n The sum of the values is calculated as X and Y.

11. Calculate the ratio X / Y and measure the average degree of orientation Z as the average value of X / Y obtained on six electron micrographs. Measuring the number N of artificial fibers inserted into the filament nonwoven fabric B;

1. Prepare three composite nonwoven fragments and six electron micrographs identical to those used for the measurement of average orientation degree Z.

2. Peel filament nonwoven B from each of the three pieces to make three filament nonwovens B. The thickness of the filament nonwoven fabric B was determined by applying the compressive layering method of the KES-FB testing system using a compression tester (KES-FB-M3, KES-FB-E3, DATO TECH CO., LTD.). It is measured at four points determined so that the distance between them is 2 cm or more, and the thickness TB of filament nonwoven fabric B is measured by the average value of the obtained 12 thickness values.

3. Draw a straight line 1/2 TB on each of the six electron micrographs parallel to the standard line X ₀ and with a distance of half the value of TB obtained in step 2.

4. The number of man-made fibers traversing straight 1/2 TB is counted between vertical lines Y ₁ and Y ₂ at 500 μm intervals, and the number N is measured as the average of the numbers obtained on six electron micrographs.

Density measuring method of man-made fiber nonwoven fabric A;

1. Prepare six electron micrographs identical to those used for the measurement of the average orientation degree Z.

2. Standard lines X ₁ and X ₂ are drawn along the top and bottom surfaces of man-made fiber nonwoven fabric A using the same method used to draw standard line X ₀ in the mean orientation measurement. Fragments of the vertical lines Y ₁ and Y ₂ drawn across the standard lines X ₁ and X ₂ were measured on six electron micrographs, and the thickness T (μm) of man-made fiber nonwoven fabric A was obtained from the thickness obtained in six micrographs. Measured as average.

3. Weight per unit area of artificial fiber nonwoven fabric A (g / m &lt; 2 &gt;) measures the weight per unit area of composite nonwoven fabric according to JIS-L-1096, and measures the number N of artificial fiber nonwoven fabric A at the weight per unit area of the composite nonwoven fabric. It is obtained by subtracting the value of the weight per unit area of the filament nonwoven fabric B obtained in.

4. The density of artificial fiber nonwoven fabric A is obtained in W / T (g / cm 3).

Flexural Hardness: The flexural hardness of a composite nonwoven fabric is measured according to the bending method of KES-FB testing system. The measurement was carried out 5 times in the transverse direction of the composite nonwoven fabric to the test specimen with longitudinal and pure bending testers (KATO TECH., LTD.) Corresponding to the interweaving direction of artificial fiber nonwoven fabric A and filament nonwoven fabric BRK, and the composite nonwoven fabric was bent Hardness is taken as the average of the obtained values.

Breathability: The breathability of the composite nonwoven fabric is measured by the Fracture Type Test according to JIS-L-1096 and expressed as an average of five measurements.

Breaking strength: The breaking strength of the composite nonwoven fabric is measured according to JIS-L-1096. First, a test sample having a width of 3 cm and a distance of 10 cm between two specific points was prepared, and the breaking strength was measured by Tensilon UTM-1 (TOYO BALDWIN CO., LTD.), And the average of five measurements (kg / cm ).

Elongation at Break: The elongation at break of the composite nonwoven fabric is measured using the same process as used for the measurement of the breaking strength and expressed as the average of five measurements.

Hydraulic resistance: According to JIS-L-1092, the water resistance is measured by a low pressure method applied to a sample having a hydraulic resistance of 1000 mmH ₂ O or less, and is expressed as an average value (mmH ₂ O) of five measurements.

Meison jar test: IST 80, 7-70, MEISON JAR method for the number of minutes from the time the column column pressure of 114 mmH ₂ O of physiological saline was applied to the composite nonwoven fabric specimen The measurement is carried out according to the results, and the results are expressed as the average of three measurements. Composite nonwovens having a value of 60 minutes or more are acceptable in the Mayson ruler.

Leak resistance when deformed as a result of compression or bending: Cut into 10 cm square specimens from a composite nonwoven fabric. In addition, two 10 cm square plates are prepared in the center of the 6 cm diameter hole, and the specimens are arranged between the two plates. Pour 10 cc of colored saline into the center of the top plate hole from the dropping pipette. A test piece having two plates is placed on an acrylic resin cylinder and has an inner diameter of 90 mm and an outer diameter of 100 mm, and the cylinder can be pushed in a reciprocating fashion by a bar having a surface of 5 cm of curvature having a central portion of the test piece having a stroke of 20 mm. The propellant of the bar is counted when the colored saline is spread throughout the lower surface of the specimen through an acrylic cylinder. Liquid leakage resistance is evaluated by the average of five measurements.

The present invention is described in detail with reference to embodiments of the composite nonwoven fabric according to the present invention.

The following water repellent treatment is applied to all of the composite nonwovens of the following examples and the properties of the composite nonwovens are measured.

Water repellent: Asahi Guard Series AG-433 (MEISEI KAGAKU CO., LTD.)

Treatment: The composite nonwoven fabric was immersed in an aqueous solution containing 5% water repellent, dried at 100 ° C. for 2 minutes and then cured at 160 ° C. for 1 minute.

In the embodiment, the method of synthesizing the lamination agent uses a water jet stream. The main conditions of water jet airflow treatment are as follows.

Hole diameter of the water jet stream injection nozzle: 0.2 mm

Distance between nozzle and composite nonwoven fabric: 30 mm

Wire mesh arranged in intermediate position between nozzle and composite nonwoven: 70 mesh wire mesh

Nozzle Rotating Condition:

Turning radius: 6mm

Rotational Speed: 200rpm

Example 1

Spray a volume of viscose rayon artificial fiber with a predetermined amount of fineness of 0.1 denier and a 5 mm length of polyethylene terephthalate artificial fiber and a fineness of 1 denier and 5 mm of length of polyethylene terephthalate artificial fiber Agitate to form a slurry of 0.63% of concentrate. Artificial fiber nonwoven fabric A having a weight of 25 g / m 2 per unit area is obtained as a papermaking slurry of a warp wire mesh paper machine.

The filament nonwoven fabric B melt-spun polyethylene terephthalate polymer, draws the molten polymer extruded from the spinneret with an air intake to form a uniform filament web, and has a lower roller having a smooth surface and an upper portion having a plurality of block surfaces on the surface. The web is manufactured by thermal compression using a pair of embossing rollers. The filament fineness of this filament nonwoven fabric B is 2 deniers and the obtained filament nonwoven fabric B has a weight of 25 g / m 2 and an average elongation at break of 22.5% per unit area. The filament nonwoven fabric B is laminated on the artificial fiber nonwoven fabric A, and then subjected to water jet airflow treatment on the upper surface of the filament nonwoven fabric B and the lower surface of the artificial fiber nonwoven fabric A, respectively, to produce the composite nonwoven fabric according to the present invention. The water jet stream is treated in three stages while changing the pressure of the water jet stream as necessary. That is, the working pressure of the water jet stream is 15 kg / cm 2 in the first step, 15 kg / cm 2 in the second step and 30 kg / cm 2 in the third step. In filament nonwoven fabric B, the area ratio of the bonded portions produced by embossing is 10% of the total area of nonwoven fabric B.

EXAMPLES 2-4

In Examples 2-4, artificial fiber nonwoven A was used as a papermaking method and laminated directly to the same filament nonwoven B as used in Example 1. In other words, a polyethylene terephthalate artificial fiber having a fineness of 0.1 denier and a length of 5 mm and a viscose rayon artificial fiber having a fineness of 0.1 denier and a length of 5 mm are dispersed in water in the following three composition ratios and stirred to obtain a slurry having a concentration of 0.63%. To form. An artificial fiber nonwoven fabric A having a weight of 25 g / m 2 per unit area is directly made of the filament nonwoven fabric B to form a laminate.

Artificial Fiber Composition of Nonwoven Fabric A

The composite nonwoven fabric of Examples 2 to 4 was formed by subjecting the laminate to a water jet stream on the upper and lower surfaces of the laminate in the same manner as in Example 1. That is, three water jet stream treatments using a pressure of 15 kg / cm 2 in one step, 15 kg / cm 2 in two steps and 30 kg / cm 2 in a third step are successively applied on both sides of the laminate.

Example 5

5 parts by weight of polyethylene terephthalate artificial fiber having a fineness of 0.1 denier and 5 mm, 7 parts by weight of viscose rayon artificial fiber having a fineness of 1 denier and a length of 5 mm, and a fineness of 0.4 denier and 5 mm in length. 8 parts by weight of polyethylene terephthalate artificial fiber is dispersed in water and stirred to form a slurry having a concentration of 0.63%. The composite nonwoven fabric of Example 5 was prepared in a slurry using the same method as used in Examples 2-4.

Example 6

Viscosity rayon artificial fibers with a density of 0.38% and a weight of 1 kg of polyester-based ultrafine artificial fibers having a density of 1 denier and a length of 5 mm and a density of 1 denier and a length of 5 mm 3 parts by weight of fiber are obtained by mixing and stirring in water to obtain a papermaking slurry. Artificial fiber nonwoven A is laminated to the same filament nonwoven B as used in Example 1.

The laminate was subjected to water jet airflow treatment at the upper and lower surfaces of the laminate in three steps to form the composite nonwoven fabric of Example 6. That is, three water jet stream treatments by pressure of 10 kg / cm 2 of the first step, 10 kg / cm 2 of the second step and 20 kg / cm 2 of the third step are successively applied on both sides of the laminate.

Example 7

Except for changing the concentration of the slurry to 1%, an artificial fiber nonwoven fabric A having a weight of 40 g / m 2 per unit area was obtained from the same papermaking slurry as used in Example 6, and the same filament as that used for the artificial fiber nonwoven fabric A in Example 1 It is laminated on nonwoven fabric B.

The composite nonwoven fabric of Example 7 was made by subjecting the laminate to water jet airflow in three steps on the top and bottom surfaces of the laminate. That is, three water jet stream treatments with a pressure of 15 kg / cm 2 of the first step, 20 kg / cm 2 of the second step, and 30 kg / cm 2 of the third step are successively applied on both sides of the laminate.

[Examples 8-10]

The composite nonwoven fabrics of Examples 8 to 10 were prepared using the same method as used in Example 3, except for using the filament nonwoven fabric B produced by the spunbond method.

Filament Nonwoven Fabric B of Example 8:

The polypropylene spunbond nonwoven fabric consists of a filament having a fineness of 3 deniers, a weight of 25 g / cm 2 per unit area, and an average elongation at break of 30%. The polypropylene polymer is melt spun to form a web and heated under the same method as in Example 1. Obtained by embossing the web.

Filament Nonwoven Fabric B of Example 9:

The nylon 6 spunbond nonwoven fabric consists of a filament having a fineness of 2 deniers, a weight of 25 kg / cm 2 per unit area, and an average elongation at break of 30%. The nylon 6 polymer is melt-spun to form a web and heated under the same method as in Example 1. Obtained by embossing the web.

Filament Nonwoven Fabric B of Example 10

The polyethylene terephthalate nonwoven fabric consists of a filament having a fineness of 2 deniers, a weight of 30 kg / cm 2 per unit area and an average elongation at break of 25%, and is obtained in the same manner as in Example 1.

Example 11

1 part by weight of polyethylene terephthalate artificial fiber having a fineness of 0.1 denier and 5 mm, 1 weight of viscose rayon artificial fiber having a fineness of 1 denier and a length of 5 mm, and a polyethylene having a length of 1 denier and 5 mm in length 2 parts by weight of terephthalate artificial fibers are dispersed in water and stirred to form a slurry having a concentration of 0.63%. The composite nonwoven fabric of Example 11 is prepared in a slurry in the same manner as in Examples 2-4.

Example 12

2 parts by weight of a polyethylene terephthalate artificial fiber having a fineness of 1 denier and a length of 5 mm, 7 parts by weight of a viscose rayon artificial fiber having a fineness of 1 denier and a length of 5 mm and a fibrillated acrylic pulp obtained by the following method 1 The weight parts are dispersed in water and stirred to form a slurry having a concentration of 0.63%. The composite nonwoven fabric of Example 12 is manufactured by the method similar to Examples 2-4.

Fibrillated acrylic pulp of Example 12 was prepared by the following method.

Polyethylene oxide having 95.0 weight percent of acrylonitrile, 4.5 weight percent of acrylic acid methyl ester and 0.5 weight percent of sodium metalrylsulfonic acid, and a number average molecular weight of 10,000 and a weight ratio of polyethylene oxide and polypropylene oxide of 70 to 30 The block copolymer of polypropylene oxide-polyethylene oxide is dissolved in dimethylformamide to obtain a spin dope comprising 23% by weight of the acrylic polymer and 2.3% by weight of the block copolymer. The spinning dope was fixed for 6 hours and then extruded through spinnerate to a coagulation bath containing 75% dimethylformamide at 35 ° C. to form an undrawn fiber. After washing the undroon fiber, and the extraction operation at a rolling ratio of 12 times, and hot-air dried at 80 ℃ to form a fiber of Macedoe 1.5 denier. The obtained fiber is cut into 5 mm pieces, and 10 parts by weight of the cut fibers are dispersed in 90 parts by weight of water. This fiber dispersion is fed to a disc refiner with a disc distance of 0.1 mm and knocked until the filtration degree is zero. Beet acrylic pulp originally has a plurality of barbed fibrils made by separating the same from the fiber near the surface of the portion corresponding to the trunk of the acrylic fiber. The trunk of the fibers is also partially separated in its longitudinal direction to form fine fibers.

As a result of the measurement of the properties of the composite nonwoven fabric of Example 12, it became clear that the water resistance and the tensile strength of the composite nonwoven fabric can be somewhat improved without decreasing the breathability by using fibrillated acrylic pulp. In addition, when the electron micrograph of the composite nonwoven fabric of Example 12 was observed, the average degree of orientation Z of the artificial fibers having a fineness of 0.3 denier or less and the artificial fibers having a fineness of 0.5 denier or more was maintained at a high level, and the fibrillated acrylic pulp It is evident that the fibers of woven are sufficiently mixed with the artificial fibers nonwoven fabric A and the nonwoven fabric B.

Example 13

A slurry having a density of 0.63% by dispersing and stirring 57% by weight of polyethylene terephthalate artificial fiber having a fineness of 0.1 denier and 5mm and 43% by weight of viscose rayon artificial fiber having a fineness of 1 denier and 5mm in water. To form. Artificial fiber nonwoven fabric A, weight 25 g / m 2 per unit area, is obtained by papermaking slurry with a warp wire mesh type paper machine. The same filament nonwoven fabric B as in Example 1 was laminated on artificial polymer nonwoven fabric A to make a laminate. That is, three water jet stream treatments with a pressure of 15 kg / cm 2 of the first stage, 15 kg / cm 2 of the second stage and 30 kg / cm 2 of the third stage are successively applied on both sides of the laminate.

Example 14

1 part by weight of polyethylene terephthalate artificial fiber having a fineness of 0.25 denni and 5 mm and 3 parts by weight of viscose rayon artificial fiber having a fineness of 1 denier and 5 mm in water were dispersed and stirred to prepare a slurry having a concentration of 0.63%. Form. Artificial fiber nonwoven fabric A having a weight of 25 kg / m 2 per unit area is obtained by a paper mill with a warp wire mesh type paper machine. The same filament nonwoven fabric B as in Example 1 was laminated on artificial fiber nonwoven fabric A to make a laminate. The laminate was treated in three stages with water jet airflow at the top and bottom surfaces of the laminate to produce the composite nonwoven fabric of Example 14. That is, three water jet stream treatment by pressure of 15 kg / cm 2 of the first step, 15 kg / cm 2 of the second step, and 30 kg / cm 2 of the third step is continuously applied on both sides of the laminate.

Example 15

1 part by weight of polyethylene terephthalate artificial fiber having a fineness of 0.1 denier and 5 mm and 3 parts by weight of viscose rayon artificial fiber having a fineness of 0.5 denier and 5 mm in water were dispersed and stirred in a slurry having a concentration of 0.63%. Form. Artificial fiber nonwoven fabric A having a weight of 25 g / m 2 per unit area is obtained by paper slurries with a warp wire mesh type paper machine. The filament nonwoven fabric B as in Example 1 was laminated on the artificial fiber nonwoven fabric A to form a laminate. The composite nonwoven fabric of Example 15 was prepared by subjecting the laminate to water jet airflow in three steps on the top and bottom surfaces of the laminate. That is, three water jet stream treatments with a pressure of 15 kg / cm 2 of the first step, 15 kg / cm 2 of the second step and 30 kg / cm 2 of the third step are successively applied on both sides of the laminate.

Comparative Example 1

1 part by weight of polyethylene terephthalate artificial fiber having a fineness of 0.1 denier and 5 mm and 1 part by weight of viscose rayon artificial fiber having a fineness of 1 denier and 5 mm in water was dispersed and stirred to prepare a slurry having a concentration of 1%. Form. Artificial fiber nonwoven fabric A having a weight of 40 g / m 2 per unit area is obtained by a papermaking slurry with a thin wire mesh type paper machine. A polypropylene spunbond nonwoven fabric B containing 3 denier filaments, having a weight of 30 g / m 2 and an average breaking elongation of 85%, was prepared in the same manner as in Example 1, and the filament nonwoven fabric B was fabricated on the artificial fiber nonwoven fabric A. The laminate is formed by laminating in a widened state. The composite nonwoven fabric of Comparative Example 1 was prepared by treating the laminate in three stages on the upper and lower surfaces of the laminate. That is, three water jet stream treatments with a pressure of 20 kg / cm 2 in the first step, 40 kg / cm 2 in the second step and 40 kg / cm 2 in the third step are successively applied on both sides of the laminate.

Comparative Example 2

7 parts by weight of polyethylene terephthalate artificial fiber having a fineness of 0.1 denier and 5 mm and 3 parts by weight of viscose rayon artificial fiber having a fineness of 1 denier and 5 mm in water are dispersed and stirred to prepare a slurry having a concentration of 0.63%. Form. Artificial fiber nonwoven fabric A having a weight of 25 g / m 2 per unit area is obtained by papermaking slurry with a warp wire mesh type paper machine. The same filament nonwoven fabric B as used in Example 1 was laminated on artificial fiber nonwoven fabric A to make a laminate. Waterjet streams are treated in three steps on the upper and lower surfaces of the laminate to produce a composite nonwoven fabric of Comparative Example 2. That is, three water jet stream treatments with a pressure of 15 kg / cm 2 of the first step, 15 kg / cm 2 of the second step and 30 kg / cm 2 of the third step are successively applied on both sides of the laminate.

Comparative Example 3

A composite nonwoven fabric of Comparative Example 3 was prepared in the same manner as in Comparative Example 2 except for changing the content of polyethylene terephthalate artificial fiber and viscose rayon artificial fiber from 7 to 3 to 1: 9.

[Comparative Example 4]

2 parts by weight of pulp obtained by tapping the Alaska pulp with a pulp for 5 minutes and 3 parts by weight of polyethylene terephthalate artificial fiber having a fineness of 1 denier and 5 mm in length are dispersed in water and stirred to form a slurry having a concentration of 0.63%. A composite nonwoven fabric of Comparative Example 4 was prepared in the same manner as in Comparative Example 2 except for using this slurry.

[Comparative Example 5]

1 part by weight of a polyethylene terephthalate artificial fiber having a fineness of 0.1 denier and a length of 5 mm and 3 parts by weight of a viscose rayon artificial fiber having a fineness of 1 denier and a length of 5 mm were dispersed in water and stirred to prepare a slurry having a concentration of 0.18%. Form. An artificial fiber nonwoven fabric A having a weight of 7 g / m 2 per unit area was directly made from the slurry on the same filament nonwoven fabric B as used in Example 1 to form a laminate. Waterjet streams are treated in three steps on the upper and lower surfaces of the laminate to produce a composite nonwoven fabric of Comparative Example 5. That is, three water jet stream treatments by pressure of 10 kg / cm 2 of the first step, 10 kg / cm 2 of the second step and 20 kg / cm 2 of the third step are successively applied on both sides of the laminate.

Comparative Example 6

The same slurry as used in Comparative Example 5 was prepared except that the slurry concentration was changed to 1.5%. An artificial fiber nonwoven fabric A having a weight of 60 g / m 2 per unit area was directly made from the slurry on the same filament nonwoven fabric B as used in Example 1 to form a laminate.

Waterjet streams are treated in three steps on the upper and lower surfaces of the laminate to produce a composite nonwoven fabric of Comparative Example 6. That is, three water jet stream treatments with a pressure of 15 kg / cm 2 of the first step, 15 kg / cm 2 of the second step, and 30 kg / cm 2 of the third step are successively applied on both sides of the laminate.

Comparative Example 7

The composite nonwoven fabric of Comparative Example 7 was prepared in the same manner as in Comparative Example 6 except that the pressures of the first, second and third steps of the water jet stream treatment were changed to 20 kg / cm 2, 40 kg / cm 2 and 40 kg / cm 2, respectively. To prepare.

Comparative Example 8

A polypropylene spunbond nonwoven fabric B containing 3 denier filaments and having a weight of 25 kg / m 2 per unit area and an average elongation at break of 55% was prepared in the same manner as in Example 1.

1 part by weight of polyethylene terephthalate artificial fiber having a fineness of 0.1 denier and 5 mm in length and 3 parts by weight of viscose rayon artificial fiber having a fineness of 1 denier and 5 mm in length were dispersed in water and stirred to obtain a slurry having a concentration of 1.5%. Form. Artificial fiber nonwoven fabric A having a weight of 60 g / m 2 per unit area was directly synthesized on the filament nonwoven fabric B in the slurry and then synthesized under the same conditions as in Comparative Example 8.

Comparative Example 9

1 part by weight of polyethylene terephthalate artificial fiber having a fineness of 0.1 denier and 5 mm and 3 parts by weight of viscose rayon artificial fiber having a fineness of 1 denier and 5 mm in water are dispersed and stirred to prepare a slurry having a concentration of 0.63%. Form. An artificial fiber nonwoven fabric A having a weight of 25 g / m 2 per unit area is directly made of the slurry on the filament nonwoven fabric B to form a laminate.

Waterjet streams were treated in three stages on the upper and lower surfaces of the laminate to produce the composite nonwoven fabric of Comparative Example 9. That is, three water jet stream treatments with a pressure of 15 kg / cm 2 of the first step, 15 kg / cm 2 of the second step, and 30 kg / cm 2 of the third step are successively applied on both sides of the laminate.

TABLE 1

TABLE 2

Table 1 shows the structure of the composite nonwoven fabric of Examples 1-15 and Comparative Examples 1-9, and Table 2 shows the characteristic of a composite nonwoven fabric. As shown in Table 2, the composite nonwoven fabrics of Examples 1 to 5 had excellent breathability, very high water resistance, and had a tolerance of 60 minutes or more in the Mayson ruler. It also has excellent liquid barrier properties and bacterial barrier properties. In addition, since the resistance to liquid leakage due to deformation caused by bending or compressive force is excellent, the composite nonwoven fabric has excellent ability to prevent blood chimneys generated as a result of compression of the manipulator, for example, during operation, and has excellent breathability. No moisture is accumulated, and the strength and flexibility of the composite nonwoven fabric are excellent.

The above characteristics of the composite nonwoven fabric according to the present invention can be clarified in comparison with the properties of the composite nonwoven fabric of Comparative Examples 1-9. For example, in Comparative Examples 1, 4, 5, 7, 8, and 9, the N value is large but the average orientation value is small. The proportion of artificial fibers having a fineness of 0.3 denier or more in the artificial fiber nonwoven fabric A is large in Comparative Example 2 and small in Comparative Example 3, so that the former is poorly breathable and the latter is poorly water resistant. In addition, since the weight per unit area of the artificial fiber nonwoven fabric A is excessive in the composite nonwoven fabric of Comparative Example 6, the breathability is poor and the entanglement between the artificial fiber nonwoven fabric A and the filament nonwoven fabric B is not sufficient in this composite nonwoven fabric.

The apparent density of the artificial fiber nonwoven fabric A of Examples 1-15 is 0.1 g / cm <3> or less. On the other hand, in Comparative Examples 1, 5 and 9, the artificial fiber nonwoven fabric A having a small value of the average degree of orientation Z has an appearance density of less than 0.1 g / cm 2.

According to the present invention, the composite nonwoven fabric can be used for medicines such as surgical clothes, sheets, drapes, masks, and can also be used for topsheets of leather such as sanitary napkins and diaper filters, wallpaper, artificial leather and the like.

Claims (6)

A synthetic fiber nonwoven fabric (A) having the following components (1) to (3) and a filament nonwoven fabric (B) formed so that the filaments are partially bonded to each other, and a part of the artificial fibers constituting the artificial fiber nonwoven fabric (A) is filament Interwoven with the filaments that are inserted into the nonwoven fabric (B) to form the filament nonwoven fabric (B) to form a laminate of the artificial fiber nonwoven fabric (A) and the filament nonwoven fabric (B), with an area of 500 μm length in any cross section of the composite nonwoven fabric. The composite nonwoven fabric characterized in that the number N of artificial fibers inserted to a depth of 1/2 or more of the thickness of the filament nonwoven fabric (B) is 20 or less. (1) F + G≥50 wt% 1 / 7≤F / G≤4 / 3 [Wherein F is the ratio of artificial fibers having a fineness of 0.3 denier or less in the total artificial fibers; G is the ratio of artificial fibers having a fineness of 0.5 denier or more in the total synthetic fibers]. (2) Weight per unit area: 10g / ㎡ ~ 40g / ㎡ (3) Average orientation of artificial fibers Z: 2.0 ~ 10. The composite nonwoven fabric of Claim 1 whose external density of the artificial fiber nonwoven fabric (A) is 0.1 g / cm <3> or more. The composite nonwoven fabric according to claim 1, wherein the filament nonwoven fabric B has an average elongation (a value obtained by averaging the breaking elongations measured in two mutually perpendicular directions) of 40% or less. The composite nonwoven fabric according to claim 1, wherein the man-made fiber nonwoven fabric (A) is composed of at least regenerated cellulose fibers, wherein the ratio of regenerated cellulose fibers is at least 50% by weight and at most 80% by weight. The composite nonwoven fabric of Claim 1, wherein the man-made fiber nonwoven fabric (A) is composed of regenerated cellulose fibers and polyester fibers, wherein the ratio of polyester fibers is 1/3 or more and 1 or less with respect to regenerated cellulose fibers. The composite nonwoven fabric according to claim 1, wherein the artificial fiber nonwoven fabric (A) is composed of at least fibrillated acrylic pulp and the ratio of fibrillated acrylic pulp is at least 5% by weight and at most 15% by weight.