JPH01104866A - Three-layer structural nonwoven fabric - Google Patents

Abstract

PURPOSE: To prepare a nonwoven fabric having three layer structure excellent in abrasion resistance, dust resistance, moisture absorbing properties and air permeability, and useful as a surgery gown or the like by placing an ultrafine- fiber web layer between web-layers of long-yarn cellulose fibers and long-yarn synthetic fibers, and integrally entangling fibers of every layer with each other. CONSTITUTION: Three layers comprising a web layer B consisting of cellulose fibers 1, 1', 1" of long fibers or relatively long fibers, a web layer D consisting of synthetic fibers 3 of long fibers or relatively long fibers, and a web layer C existing between the two web layers B and D and consisting of ultrafine fibers 2 are laminated on each other, the laminated layers are placed on a 100-mesh screen, thin ejecting water streams of high pressure are ejected from the upper side of the cellulose-fiber web layer B, and at the same time suctioning is applied from the lower side of the screen to integrally entangle fibers constituting each web layer with fibers constituting the other web layers. Thus, the objective nonwoven fabric is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a three-layer nonwoven fabric. More specifically, the present invention relates to a three-layer nonwoven fabric comprising a cellulose fiber web, ultrafine fiber Kueb, and a synthetic fiber web.

<Prior art> An aggregate of fibers made of wood pulp and synthetic organic fibers is treated with a thin columnar jet of water having an orifice supply pressure of at least 46,900 kpa to entangle the constituent fibers, thereby forming spunlace. A method for obtaining a nonwoven fabric is disclosed in Japanese Patent Application Laid-Open No. 59-94659. This nonwoven fabric is mainly suitable for medical applications (uses that take advantage of its bacterial barrier properties), and
Used as a surgical gown.

<Problems to be Solved by the Invention> Since one of the layers of this known two-layer nonwoven fabric is made of wood pulp, that is, extremely short fibers are used, it is difficult to absorb water. The entangled state of the jet-treated fibers is susceptible to abrasion, and as a result, there is a problem in that fluffing and fibers are likely to fall off during use.

Therefore, such nonwoven fabrics are not suitable for wipers, protective clothing, etc. used in electronics factories, for example.

In addition, as mentioned above, the known two-layer structure nonwoven fabric is provided with excellent /J cutillary barrier properties due to the fibers being highly entangled with each other by providing a special device to the water jet as described above. Because it simply has a two-layer structure, it has the problem that its bacterial barrier properties may be insufficient depending on the application.

The object of the present invention is to solve the problems of conventionally known nonwoven fabrics having bacterial barrier properties and to provide a nonwoven fabric that has excellent bacterial barrier properties and high abrasion resistance.

Means for Solving the Problems> An object of the present invention is to provide a web layer consisting of cellulose fibers having long fibers or a relatively long fiber length, and a web layer consisting of synthetic fibers having long fibers or a relatively long fiber length. A three-layer structure nonwoven fabric comprising a layer and a web layer made of ultrafine fibers arranged between the two layers, wherein the fibers constituting each web layer constitute other web layers in the nonwoven fabric. A three-layer structure non-woven fabric characterized by being integrally intertwined with fibers.

It is preferable to use short fibers as the ultrafine fibers. Since the fibers constituting the intermediate web layer made of ultrafine fibers, which are preferably short fibers, are ultrafine fibers, it is possible to form a dense layer between the web layer made of cellulose fibers and the web layer made of synthetic fibers. can. As a result, the bacteria barrier properties are further improved.

In the nonwoven fabric according to the present invention, the fibers constituting each web layer are integrally intertwined with the fibers constituting other web layers. In this case, as the fibers forming the outer web layer, cellulose fibers with long fibers or relatively long fiber length are used on one side, and synthetic fibers with long fibers or relatively long fiber length are used on the other side, so that they are different from each other. The outer fibers intertwined with the fibers of the web layer are continuous. So, for example, if we look at a single cellulose fiber for the outer web,
One part is intertwined with the fibers in the web layer made of ultra-fine fibers, and the other part is sometimes further intertwined with the fibers in the other outer tsep layer made of long synthetic fibers, forming a part constituting the outer web. @The arrangement is almost the same for other synthetic fibers for the outer web. Since the fibers constituting the outer web layer are thus continuously intertwined with the fibers in the inner web layer, the abrasion resistance of the obtained nonwoven fabric is improved.

In the three-layer nonwoven fabric according to the present invention, the fibers are entangled using jet water, as will be explained in detail later. Cellulose fibers generally have an extremely low Young's modulus in a wet state, and therefore are easily moved by water jets. This makes it easier to get entangled with other fibers. In the three-layer structure nonwoven fabric according to the present invention, the long fibers of cellulose fibers having the above properties or the short fibers having relatively long fiber length are entangled with the fibers of the other web layer by a jet of water, so that the fibers of the other web layer are sufficiently A non-woven fabric with high abrasion resistance as described above because it can penetrate into other web layers and the penetrated fiber part is continuous with other parts, such as the part in the outer web layer. is obtained. Further, it is possible to stably arrange an intermediate dense layer consisting of the necessary amount of ultrafine fibers in the nonwoven fabric to take such an entangled form.

Furthermore, since cellulose fibers are used in one side of the outer maple layer, when the nonwoven fabric of the present invention is used for protective clothing, etc., it can provide desirable texture and moisture absorption (sweat) properties when worn. Also, depending on the application, it is possible to increase the amount of cellulose fibers due to the use of the above-mentioned entangled form. Note that some conventionally known nonwoven fabrics of this type include a water repellent in order to improve their bacterial barrier properties. This is to prevent bacteria from entering as the liquid permeates. However, the water repellent treatment acts to impair the texture and moisture absorption (sweat) properties of the nonwoven fabric. However, in the three-layer nonwoven fabric according to the present invention, since a dense layer made of ultrafine fibers is used as the intermediate layer, it is usually possible to provide sufficient bacterial barrier properties against the intended purpose without using a water repellent. Of course, the three-layer nonwoven fabric according to the present invention may be treated with a water repellent to further improve its bacterial barrier properties.

Hereinafter, the three-layer structure nonwoven fabric of the present invention will be explained in detail based on an illustrated example.

FIG. 1 is a diagram illustrating the state of web layer stacking during production of the three-layer nonwoven fabric of the present invention. In FIG. 1, ■ is a web layer made of cellulose fibers), ■ is a web layer made of ultrafine fibers, and ■ is a web layer made of synthetic fibers.

FIG. 2 is a schematic diagram showing an enlarged cross section of the three-layer nonwoven fabric of the present invention (approximately 60 times).

In Figure 2, ■ is a web layer made of cellulose fibers, ■ is a web layer made of ultrafine fibers, and ■ is a web layer made of synthetic fibers, and these three web layers are sandwiched. The fibers are overlapped and intertwined with each other to form a tissue. A part 1' of the constituent fibers of the web layer made of cellulose long fibers 1 is inserted between the ultrafine fibers of the web layer O made of ultrafine fibers, and a part of the fibers bends in all directions and intertwines with the ultrafine fibers. ing.

Furthermore, some of the fibers 1'' are interlaced between the synthetic fibers of the web layer (2) made of synthetic fibers, and some of the fibers are bent in all directions and intertwined with the synthetic fiber long fibers 3.

As described above, the three-layer nonwoven fabric of the present invention is characterized by a structure in which the fibers constituting the web layer are intertwined with each other and integrated.

For example, when used in a wiping cloth, each layer is integrated to the extent that it will not peel off during bending or wiping during use.

The degree of integration of the three-layer nonwoven fabric of the present invention can be evaluated by measuring peel strength. For example, the degree of integration can be determined from the degree of unification, such as those that tend to peel off after repeated washing several times, and those that partially break off when attempting to peel off.

In addition, the three-layer nonwoven fabric of the present invention, in which the surface of the long synthetic fiber web layer is treated with a water repellent, provides a bacterial barrier property and can be used as a surgical gown. In other words, the outer surface of the surgical gown has poor bacterial barrier properties.
The inside is hygroscopic and has plenty of breathability. Furthermore, the layers do not peel off even after repeated washing several times.

The cellulose fiber wafer of the three-layer nonwoven fabric of the present invention: Layer C is a web made of either regenerated cellulose fibers such as cufurammonium rayon or viscose rayon, or natural cellulose fibers such as wood M, and the fiber length is 20!
It consists of short fibers having a relatively long fiber length of 1 or more, preferably 28 cm or more, and preferably continuous long fibers.

If the fiber length is less than 20 m, the above-mentioned intertwining of the fibers between the web layers will be insufficient, the silanib layer will easily peel off, and the wet strength will be poor.

The cellulosic fiber web layer is, for example, a web formed by aligning fibers with a card, or a web formed by a wet paper making process, a wet paper making process, or a wet process paper making process. It may be a 7M nonwoven fabric, as long as its constituent fibers move with water flow.

Next, the synthetic fiber web layer is made of polyamide, polyester,
It is a web made of fibers of polypropylene, polyacrylonitrile, and copolymers thereof, or a mixed web thereof, consisting of short fibers having a fiber length of 20 or more, preferably 28 or more. Continuous long fibers can also be incorporated. If the fiber length is less than 20 m, a relatively large area of fusion points is required to organize the web, and there are few areas where the cellulose fibers penetrate, and there are fewer movable fibers of the synthetic fibers. Otherwise, the integration due to fiber entanglement will be weak, and the wet strength will be poor.

The synthetic fiber web layer is, for example, a web formed by melt-spinning, cutting fibers, and aligning them with a card, or a web formed by spinning directly on a conveyor to form a web. It is not particularly limited, as long as it is a soft nonwoven fabric, and the constituent fibers are structured to the extent that they can be moved by water flow.

The ultrafine fiber web layer may be made of any one of polyamide, polyester, polypropylene, polyacrylonitrile and its copolymers, cuproammonium rayon, physolyl fibers thereof, and beaten products of natural fibers such as cotton, linters, and pulps. In that mixed web,
The single fiber fineness of the fiber is preferably 0.6d or less. The length of the fibers does not particularly affect the pacteria barrier properties, but in consideration of lint-free properties, the length of the fibers is preferably 2 or more, more preferably 51 or more. In the case of synthetic fibers, it is possible to form a cross by melt-spinning nine fibers with the same fineness. In addition, in the case of cuproammonium rayon, it is possible to spin fibers with a thickness of 0.1 d by wet spinning (Japanese Patent Application Laid-Open No. 51-1979-1).
(See Publication No. 70311).

In addition, the beaten fibers may be distributed from 0.01 d to 2 d and have an average denier of 0.6 or less.

The ultrafine fiber web layer forms a dense layer, but the single yarn is 0.
Fibers with a diameter of 6d or more have poor bacterial barrier properties. Preferably, fibers with a diameter of 0.3 d or less are used.

In addition, the fabric weight of the ultrafine fiber web layer is formed in the range of 6 to 5017 m''.If it is less than 617 m'', the bacteria barrier properties will be poor, and if it is more than 5017 m'', it will be too dense and the breathability will be poor.It is preferable. Range is 8-4017m
” range.

The ultrafine fiber web layer may be formed by spinning ultrafine fibers using a normal melt spinning method, cutting and carding to form a web, or forming a web by spinning ultrafine fibers using a melt blow spinning method, or These include those made by wet spinning recycled fibers to form a web, and those made by beating natural fibers to make paper.

In one embodiment of the three-layer nonwoven fabric of the present invention, the surface of the web layer made of synthetic fibers is treated with a water repellent. This treatment provides liquid barrier properties and, in conjunction with the dense structure, provides an improved bacterial barrier property.

In addition, using a cellulose fiber web layer,
Combined with its dense structure, it provides high water absorption. Furthermore, since a web layer of relatively long fibers of 201 m or more is formed on both sides, it provides high abrasion resistance.

Next, the method for manufacturing the three-layer nonwoven fabric of the present invention will be described in detail.

First, the three-layer web mentioned above as the material web, namely,
A cellulosic fiber web, a synthetic fiber web, or a microfiber web is selected.

Next, the microfiber web is sandwiched and three layers are laminated.In this case, it may be manufactured in an offline process in which webs manufactured in different manufacturing processes are laminated, or in a process in which each web is manufactured. It may also be produced by combining.

For example, a process for producing a synthetic fiber aluminated nonwoven fabric, a process for producing a melt blown nonwoven fabric, and a process for producing a recycled fiber aluminated nonwoven fabric using a wet method may be combined.

For example, as shown in FIG. 1, the web selected in this way is stacked with an ultrafine fiber web layer between the cellulose fiber web layer and the synthetic fiber web layer, with the cellulose fiber web layer on top. This is placed on a screen, and a thin, high-pressure jet of water is sprayed above it. In another embodiment, the web layers laminated as described above may be placed on a screen with the synthetic fiber web layer facing upward, and the water jet may be sprayed over the screen.

The screen MEC usually has a number of about 20 to 100. The pressure of the jet water flow is selected to be 25 kmM32 or higher, preferably 30 kg/ls'' or higher.25K
g/cm" or less, satisfactory wet strength is often not obtained. Treatment with jet water may also be performed from above the synthetic fiber web layer by inverting the web layer. If treated in this way, After treatment, a three-layer nonwoven fabric of the present invention is obtained through a drying process.

Since the present invention uses the manufacturing method described above, the fibers constituting the cellulose fiber m'y nib layer, when wetted, become fibers with an extremely low Young's modulus and are not easily exposed to water flow. Some of the fibers are not easily movable and are packed into the ultra-fine fiber web layer, entwined with the fibers, and then penetrated through the ultra-fine fiber web layer and packed into the synthetic fiber long fiber web layer. Gets entangled with fibers. In addition, if the fibers are reversed and treated with a high-pressure thin water jet from the synthetic fiber web layer side, some of the fibers will move, penetrate the ultrafine fiber layer, and pierce the 982 layers of cellulose fibers, and the cellulose long fibers will be Entwined and intertwined together.

<Example> The present invention will be explained in detail below with reference to Examples.

Prior to describing the examples, the definitions and measurement methods of characteristic values used in the examples will be collectively shown.

◎Weight: Take 3 samples of 250 x 250 size from the samples in standard condition, and after reaching the moisture equilibrium state, measure the weight (L) and calculate the average value 1.9/m2 per unit area)
Expressed as

◎Water absorption rate: Take three test pieces of 14.5 x 2.2 crn from the sample, one each in the vertical and horizontal directions, and
Hold it at a fixed height above a beaker containing Hemacell at 2°C and secure it vertically with a clip. Next, the Hemacel was brought close to the test piece, and the water absorption height (■) of the Hemacel 1 minute after contact was measured and expressed as the average value (■).

◎Water absorption amount: Sample 10cm x 10cm! The sample was cut into pieces of n and weighed (Wl), and the sample was sandwiched between a wire mesh made of lO mesh and immersed in Hemacel solution for 5 minutes. Next, it was left on a wire mesh for 5 minutes, and then picked up with tweezers to remove excess hemacel for 30 seconds, and the weight was measured (W2). ◎Strong elongation: Measured according to JIS-1068. It is expressed in strength (kg15c1f1 width) and elongation (%).

◎Abrasion resistance: Sample in standard condition, width 25m x length 25m
0■ was rubbed using a single vibration type bending friction tester (Takashi Seisakusho M) under the conditions of a load of 200Ii and 50 times of friction. After friction,
Accurately collect approximately 21 small pieces of 25 x 25 samples, fill an ultrasonic cleaner (Yamato, B220H) with 250 cc of water, wash for 15 minutes, and collect the fallen lint on black door paper after removing the sample pieces. After drying and controlling the humidity, measure the weight using a microbalance. It is evaluated that the more lint (m9) there is, the worse the wear resistance is.

◎Bacterial barrier property: Detector 2 simultaneously detects the upstream and downstream concentrations of the test specimen under a flow of monodisperse particles under certain conditions.
Measure with a stand and find the dustproof rate (width). Stearic acid aerosol with an average diameter of 0.3 μm was used as the monodisperse particles.

The flow rate was set to 2.1/see, and the measurement time was 1 minute. The measuring device is 5IBATA Digital Dust
Indicator Model AP-632 was used.

Dustproof rate (correspondence) = (1-Dz/DI)Xi 00
D! ;Upstream Photo Counter D! ; The higher the downstream photo counter dustproof rate (rate), the better the bacteria barrier property.

◎Peel strength: Measured according to JIS-1068.

0 strength (kg/5 cm width) Example 1 Continuous copper ammonia cellulose fiber (copper ammonia rayon) according to the regenerated fiber spunbond nonwoven fabric manufacturing method described in Japanese Patent Publication No. 52-6381.

The filament (single thread 1.5d) has a basis weight of 61
7m", 817m", 10.97m'
1 nib was produced.

A web of ultrafine polyester fibers was produced according to the melt-ploid spinning method described in JP-A-51-67411. Single yarn fineness is 0.05d and s
b, area weight 51/m", 6117m2.811/m"
, 101//m2 were manufactured.

Separately, polyester staple fiber 381
A web was manufactured by carding 1+1×2d. Pieces with a basis weight of 8117 m'' and 1017 m'' were manufactured.

These webs were stacked in three layers on top of a polyester staple fiber web, on top of a polyester ultrafine fiber web, and on top of that a copper ammonia cellulose continuous filament web, and then laminated in three layers with different combinations of basis weights to make 100 meshes. The copper ammonia cellulose continuous filament web layer was placed on a screen and treated with a high pressure narrow jet of water from above the layer. At the same time, I sucked in the bottom side of the screen. Also, the Kueb was inverted and sprayed. The processing conditions are shown below.

Orifice diameter 0. i5 mφ Processing density: 30 holes/crnx 5 times Processing pressure: 30 kli/cm2 Processing speed: 5 ml After processing for 1 minute, it was dried in a drier to obtain a three-layer nonwoven fabric.

Table 1 shows the combinations of webs and the characteristic values of the resulting three-layer nonwoven fabric.

As can be seen from Table 1, if the fabric weight of the inner ultrafine fiber web layer of the three-layer nonwoven fabric is 6117 m'' or less, 517 m
There is an example of this product, but the dustproof rate of this product is 2.1.
It is much lower than the conventional product xo, x4, 6117
It can be seen that if the ratio is 5.2 to 10.0, it is possible to manufacture products that are close to conventional products or comparable to conventional products. The strength is also similar to the conventional product, but what is particularly noteworthy is that the amount of lint after wear is 76 to 147 rng compared to the conventional product's 4501n9.
It is about 1/4 of that. As described above, the product of the present invention has excellent lint-free properties. Also, the peel strength is 350
Although the value indicates a width of ~420175 cm, the product of the present invention was integrated to the extent that it did not peel off even after repeated washing several times.

Furthermore, a web made of the previously produced copper ammonia rayon continuous filament had a basis weight of 8 J/m2, and a web made by carding polyester fibers of 38 m x 2 d had a basis weight of 10! J/m2 were selected and dyed under the following conditions.

1) Copper ammonia rayon web dye: K
ayarus 5upra Red 6BL (Japanese Gunpowder is a product) Dyeing: 30 OWf Bath ratio 1:50 Temperature rise: 30 minutes
Room temperature to 90°C Washing with water at 90°C for 45 minutes; Color fixing for 5 minutes; Amidan (Daiichi Kogyo Pharmaceutical Raw Materials) 0.2% Bath ratio 1:50 After immersion for 10 minutes Dehydration Drying 2) Dyeing dye for polyester fiber web; Fron Navy SGI, (Sand ■ product) Dyeing: 3'/yoWf Bath ratio 1:50 temperature increase; 3
0 minutes Room temperature to 100℃ 100℃ Wash with water for 1 hour; Color fix for 5 minutes; Score Roll 400 (Aoi Tsumugi is a product)
111/1 After soaking at 50°C for 15 minutes, dehydrating and dyeing the dried Quave, a web of ultrafine polyester fibers produced according to the melt blowing spinning method was placed between the copper ammonia rayon web and the polyester fiber Quave, with a basis weight of 817 m. The material was sandwiched, laminated in three layers, and subjected to an entanglement treatment according to the water jet treatment conditions of Example 1.

After the treatment, it was dried to obtain a three-layer nonwoven fabric.

When we observed the cross section of this nonwoven fabric under a microscope, we found that
We have previously detailed the manner in which copper ammonia rayon fibers dyed red are infiltrated and entangled in the white ultrafine fiber Kueb layer, and further injected and entangled in the polyester fiber web layer dyed blue. The mode of fiber entanglement described above could be observed.

Example 2 A web made of continuous filaments of copper ammonia cellulose fibers used in Example 1 and a web made of ultrafine polyester fibers were prepared.

It was also separately disclosed in Japanese Patent Publication No. 49-6150. d
A continuous filament web of polyester fibers (fabric weight: 15 Ji'/m", single yarn 1 2 ) was prepared according to a method for producing a continuous nonwoven fabric made of IJ ester synthetic fibers.

These three webs were laminated and treated according to Example 1 to produce a three-layer nonwoven fabric. The characteristic values are shown in Table 1.

As can be seen from the table, the product of the present invention has water absorption, wet strength, and dust resistance on par with conventional products, but the amount of lint, which indicates wear resistance, is extremely low at 27rn9, and it has excellent lint-free properties. I can see that Also peel strength 610111
The width was 5 IM, but at this value some fibers were cut during peeling.

Example 3 Carded web of copper ammonia cellulose stable fiber (single yarn 1.5, fiber length 51W)
”) was prepared.

The ultrafine fibers used in Example 1 were prepared. Further, the continuous filament web of polyester fiber used in Example 2 was formed to have a basis weight of 8 fi/rn''.

The three webs were laminated and treated according to Example 1 to produce a three-layer nonwoven fabric. The characteristic values are shown in Table 1.

As can be seen from the table, the product of the present invention has water absorption and dust resistance comparable to the conventional product, wet strength close to the conventional product, and wear resistance superior to the conventional product.

Example 4 Sea urchin f of the copper ammonia cellulose fiber continuous filament used in Example 3 was prepared. In addition, a web made of ultrafine polyester fibers used in Example 1 was prepared.

Next, as a synthetic fiber web, a continuous filament web of acrylic fibers manufactured by the acrylic nonwoven fabric manufacturing method disclosed in JP-A-49-117769 (swelling water content of 200 parts or more, single yarn 2d, basis weight) 15Ji'/m”
) was prepared.

The three webs were laminated and treated according to Example 1 to produce a three-layer nonwoven fabric. The characteristic values are shown in Table 1.

As can be seen from the table, the water absorption, wet strength, and dustproof rate are on par with conventional products, but the abrasion resistance is also superior to conventional products.

Example 5 A sufficiently beaten mother rug sheet (fabric weight 201/m2) was prepared, and the continuous filament web of copper ammonia cellulose fibers used in Example 1 and the continuous filament web of polyester fibers used in Example 2 were prepared. The nonwoven fabric was sandwiched and laminated, and treated according to Example 1 to obtain a three-layer nonwoven fabric. The characteristic values are shown in Table 1.

As can be seen from the table, the water absorption and dust resistance are the same as the conventional product, the wet strength is close to the conventional product, and the abrasion resistance is also superior to the conventional product.

The surface of the 191J ester fiber nonwoven fabric was treated with a water repellent. Water repellent is Shin-Etsu Chemical K Ki, polon
-MR (silicon-based) was applied to one width per fiber xi. As a result, sufficient barrier properties against liquids were provided.

Table 1 Polyester continuous fiber '1
・Continued from Example 1 In the example, the fineness of the ultrafine fiber was changed and the relationship with the dustproof rate was examined.

The copper ammonia cellulose fiber continuous filament web used in Example 1 and the polyester staple fiber (
A web of 38miaX2d) was prepared. Separately, a web was manufactured by spinning ultrafine polyester fibers using a melt spinning method. At that time, the fineness of the ultrafine fiber was set to 1. Od
, 0.6 d, and 0.3 d were spun to produce webs of each denier.

Then, the ultrafine fiber web was sandwiched and laminated into three layers for each denier, and each layer was treated according to the treatment conditions of Example 1.

Table 2 shows the characteristic values of the three-layer nonwoven fabric for each denier. Further, the characteristic values in the case of using a 0.05 d web of ultrafine fibers are those of Example 1.

As can be seen from Table 2, the fineness of the ultrafine fibers is 1. The dustproof rate of the Od product is 2.6mm, which is much lower than the dustproof rate of 10.11 of the conventional product described in Example 1, and is 5.5mm for 0.6d.
It can be seen that it is possible to manufacture products close to conventional products. Also, 7.3'1 for 0 and 3d.

At 0.05d, the fineness is as high as 7.9d, indicating that the fineness of the ultrafine fibers is preferably 0.6d or less.

Example 7 Steel ammonia cellulose fibers (copper ammonia rayon) were spun into 151111+1 by a falling tension spinning method.
Cut into four types of staple fibers of T 20ats, 28m + 51m, scouring, drying, and carding to a fabric weight of 20. F/m'', a web of HIl type was formed.The single yarn was 1.6 d.

Furthermore, using the F-edge device for spinning ultra-fine yarn disclosed in JP-A-51-70311, a large number of copper ammonia cellulose fibers each having a single yarn of 0.1 d were spun, with a basis weight of 101/m.
web was produced.

Separately, polyester staple fiber (single yarn 2
Carding d), cut length 15mt20ms+
Four types of webs of 28m+38m were produced. Each web was formed to have a basis weight of 207/'m''.

These webs were sandwiched between ultrafine fiber webs and combined for each cut length to form a web layer. Each web layer was then treated in accordance with Example 1 with a high pressure narrow water jet. Table 2 shows the characteristic values of the obtained three-layer nonwoven fabric.

As can be seen from the table, the cut length of 15 m has a low wet strength of 1.3 kg/15 crrL width in the warp direction, a low dustproof rate of 2.94, and a peel strength of 120:i75 c.
It can be seen that if the width is as low as m and the cut length is 20 mm or more, each characteristic value can be formed close to that of the conventional product.

Margin below <Effects of the Invention> The three-layer structure nonwoven fabric of the present invention has water absorption, strength, and bacterial barrier properties (dustproof properties) comparable to conventional products, and also has high lint-free properties that cannot be obtained with conventional products. A three-layer composite nonwoven fabric is provided that is abradable and therefore useful in the medical and electronics fields.

Specifically, when the nonwoven fabric of the present invention is used in surgical gowns in the medical field, surgical gowns can be provided that have excellent liquid barrier properties and bacterial barrier properties, as well as appropriate moisture absorption and breathability.

Also, if used for Wainoku in the electronics field,
A wiper with high wear resistance, excellent lint-free properties, and water absorption is provided.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the state of lamination of web layers during production of the three-layer nonwoven fabric of the present invention, and FIG. 2 is a schematic diagram showing an enlarged cross section of the three-layer nonwoven fabric of the present invention. ■... Web layer consisting of cellulose long fibers, ■...
・Web layer made of ultrafine fibers, ■...Web layer made of synthetic long fibers, 1.1', 1'... Cellulose long fibers, 2... Ultrafine fibers, 3... Synthetic fiber length fiber.

Claims (1)

[Claims] 1. A web layer consisting of cellulosic fibers having long fibers or relatively long fiber length, a web layer consisting of synthetic fibers having long fibers or relatively long fiber length, and ultrafine fibers disposed between the two web layers. A three-layer structure nonwoven fabric consisting of a web layer consisting of a web layer and a three-layer nonwoven fabric characterized in that the fibers forming each web layer are integrally intertwined with the fibers forming another web layer. Structural non-woven fabric.