JPH0314692A - Fluid-interlocked vegetable fiber pulp nonwoven fabric and its production - Google Patents

Abstract

PURPOSE:To obtain the subject fluid-interlocked nonwoven fabric having excellent fluid-barrierness, surface smoothness, delamination resistance, etc., by laminating a sheet made of vegetable fiber with a sheet made of specific short fibers and subjecting the laminate to fluid interlocking treatment. CONSTITUTION:A vegetable fiber pulp such as wood pulp and hemp pulp is processed by conventional paper-making process to form a sheet. Separately, short fibers of viscose rayon, nylon, etc., having a fiber length of <=15mm and an L/D ratio of 0.6-2.5X10<3> [L is fiber length (mm) and D is single fiber diameter (mum)] is formed in the form of sheet by a paper-making process or an air-lay process. The above sheets are stacked and laminated and high-speed fluid streams ejected from a number of nozzles are made to collide with the laminate obtained above to cause three-dimensional interlocking of the pulps, short fibers or pulp and short fiber and obtain the objective fabric having a distance between the interlocked points of the short fibers of <=300mum.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a non-porous, fluid-entangled nonwoven fabric having no jet traces on its surface, produced from vegetable fiber pulp and artificial fibers, and a method for producing the same. More specifically, a layer of nonwoven fabric mainly made of vegetable fiber pulp and a layer of nonwoven fabric mainly made of artificial fiber are interlaced and composited together in a laminated state, resulting in improved liquid barrier properties, surface smoothness, delamination properties, etc. The present invention relates to a composite nonwoven fabric that has excellent performance and is particularly suitable for use as wall covering materials and surgical gowns.

[Conventional technology]

It has been difficult to use nonwoven fabrics as wall covering materials due to various problems with conventional nonwoven fabrics.

If an adhesive is applied to a wall and then a non-woven wall material is attached, the adhesive may permeate the non-woven fabric and seep out to the surface. That is, the barrier properties of the handwoven fabric against liquids are insufficient. In addition, if you try to remove the non-woven wall material that has been pasted to re-stick it, the wall surface itself may come off, or some of the fibers of the non-woven fabric may be taken off and remain on the wall surface, causing damage to the wall surface. It impairs the original smoothness and makes it difficult to reapply. In other words, there is a difficulty in re-construction.

A wood pulp polyester spunlaced nonwoven fabric as a nonwoven fabric with excellent liquid barrier properties was published in JP-A-59-9465.
It is disclosed in Publication No. 9, and when we tested it as a wall covering material using a prototype made according to Example 1 of the publication, with the pulp side facing the wall surface (back side), it was found that it certainly had excellent barrier properties. No adhesive seepage was observed during construction. However, dimensional changes were likely to occur due to tension during construction, and joints were likely to curl. When we peeled it off from the wall to see how easily it could be reapplied, we found that it peeled off from the boundary between the pulp surface and the polyester surface, and was able to be peeled off relatively uniformly with the pulp surface remaining on the wall. However, the tensile strength of the polyester layer was not sufficient, and some threads remained on the wall surface. In addition, the appearance of the material as a wall covering material was impaired due to the streaky jet traces seen on the surface, and it lacked smoothness, making it unsuitable for printing or dyeing thin patterns. In addition, tearing along the jet traces and oozing of glue were sometimes observed.

[Problem to be solved by the invention]

The present invention does not cause glue to seep out during construction, is easy to peel off from the wall for reinstallation, does not leave any threads, and has no jet traces on the surface, making it smooth and aesthetically pleasing. The present invention provides a nonwoven fabric that has excellent printability and dyeability and is suitable for wall covering materials.

[Means to solve the problem]

The present invention is a composite nonwoven fabric formed by laminating a three-dimensionally entangled nonwoven fabric layer (A) mainly made of vegetable fiber pulp and a nonwoven fabric layer (B) made of three-dimensionally entangled short fibers having a fiber length of 15 mm or less. , the hand-woven fabric layer (A) and the non-woven fabric layer (B)
is a part of the short fibers that are mixed and intertwined at the joint and are bonded together, and the distance between the fiber entanglement points of the short fibers constituting the nonwoven fabric layer (B) is 30
This is a non-porous, fluid-entangled nonwoven fabric characterized by a pore size of 0 μm or less.

The nonwoven fabric layer (A) in the present invention is made of one or more pulps selected from wood pulps such as softwood pulp and hardwood pulp, and known vegetable fiber pulps such as cotton linter pulp and hemp pulp. , the pulp fibers are three-dimensionally entangled. Suitable basis weight of nonwoven fabric N (A) is 5 to 100 g/m2, more preferably 10 to 50 g
/m''. The nonwoven fabric layer (A) is mainly made of plant-derived pulp, but some other types of chemical fibers or synthetic fibers may be mixed therein.

The nonwoven fabric 1'i CB) in the present invention is made of recycled fibers such as viscose rayon and cupro, nylon, polyester, acrylic, vinylon, etc. It consists of one or more types of short fibers selected from fibers, etc., with a fiber length of 15 mm or less, and the single fiber fineness of the short fibers is arbitrary, but
Preferably it is 0.1-3d. A suitable basis weight of the nonwoven fabric layer (B) is 15 to 200 g/m'', more preferably 20 to 100 g/m''. Nonwoven fabric layer (B)
The fibers constituting the fibers are three-dimensionally entangled with each other, and the degree of entanglement is 300 μm or less as a distance between fiber entangled points.

The nonwoven fabrics 1i (A) and (B) in the present invention are both entangled with a fluid, preferably water, ejected from the pores at high speed. Pulp of the present invention and 15m
Short fibers, such as less than m, can be entangled tightly by fluid. In the nonwoven fabric layer (B), the intertwining progresses until the distance between the interlacing points is 300 μm or less, resulting in a nonwoven fabric layer with high strength and excellent dimensional stability, which was previously not expected.

The nonwoven fabric layer (A) and the nonwoven fabric layer (B) in the present invention are laminated, and near the interface between the laminations, the fibers constituting each layer mix and become entangled with each other. ), (B) both layers are bonded together.

The laminated nonwoven fabric of the present invention is fluid entangled. The nonwoven fabric layer (A) constituting the nonwoven fabric of the present invention and the nonwoven fabric r! (B)
can be combined together by being fluid entangled separately in advance, then laminated and subjected to the fluid entangling process again. More preferably, after laminating the non-woven fabric layer (A) and the non-woven fabric layer (B) before entangling, the laminate is subjected to a fluid entangling treatment to intertwine each non-woven fabric layer and at the same time integrate both layers. You can perform joins.

The entangling process can be performed by applying jets from both the front and back layers.

In the present invention, the jet flow trajectory refers to a continuous groove-like pattern drawn on the surface of the nonwoven fabric to be treated by the fluid stream continuously ejected from the nozzle, corresponding to the relative positional relationship between the nozzle and the nonwoven fabric to be treated. means. For example, a columnar water stream ejected from a nozzle fixed above a nonwoven fabric placed on a net conveyor and moving gives a linear jet trajectory to the surface of the nonwoven fabric.

When the nozzle moves around on a plane, it gives a spiral jet trajectory, for example. In the laminated nonwoven fabric of the present invention that does not have a jet trajectory on its surface, the traces caused by the fluid jet for entanglement on the surface are short and shallow grooves, dot-like depressions, discontinuous and random streaks, and net comparison mesh. The pattern is observed as a transferred mesh pattern, and is not recognized as the jet trajectory described above.

In the present invention, the nonwoven fabric layer (A) is an entangled layer of valve fibers, and due to the effect of fine fibrils of pulp, it becomes a high-density layer and provides barrier properties against liquids. In addition, although the pulp is densely entangled, the fiber strength of the pulp itself is low;
Since the fiber length is generally short, 1 mm or less, the strength of the pulp layer is low, and delamination easily occurs within the pulp layer, especially when peeling off to reapply when used as a wall covering material. , giving good re-construction properties. In addition, the liquid barrier effect prevents the adhesive from seeping out onto the surface.

It is also suitable for use in hospital drapes and surgical gowns. In particular, it is easily possible to further provide water-repellent finishing to provide bacterial barrier properties.

The nonwoven fabric layer (B) in the present invention has a distance between intertwining points of 3
Due to its highly entangled structure, which is unprecedented in length and has a length of 00 μm or less, it has a revolutionary high strength for nonwoven fabrics made from short fibers, especially those that are formed into sheet shapes by papermaking methods. This high strength particularly reduces the single fiber diameter of short fibers to D(μ
m), when the fiber length is L (mm), the value of the formula L/D is 0
．． 6-2. It is preferably expressed when the amount is between 5 x 103. Here, when the staple fiber is a yarn with an irregular cross section, the single yarn diameter D is determined by converting the fineness (denier) of the short fiber to that of a yarn with a round cross section. That is, the development of the strength of a nonwoven fabric is thought to be caused by the ease of movement of the threads during fluid entanglement, the resulting entangled structure, the contact area of the fibers, etc., and the shape of the fibers is one of the dominant factors.

Thus, the nonwoven fabric layer (B) as referred to in the present invention imparts extremely favorable mechanical properties to the entangled nonwoven fabric of the present invention. For example, single yarn denier 1. Od, the tensile strength of the nonwoven fabric layer (B) with a basis weight of 60 g/m'' made of short polyester fibers with a fiber length of 12 mm is 3.0 Kg/cm, Ji
The peel strength is 2. It reaches as much as 0 Kg/cII1. This level of delamination strength was difficult to achieve with conventional nonwoven fabrics (without binders).

When the interlaced laminated nonwoven fabric of the present invention is used as a wall covering material and the pulp layer side is attached to the wall surface and then peeled off, the pulp layer peels cleanly from between the eyebrows, and threads from the short fiber layer are removed or pulled. The short fiber layer does not tear during peeling, resulting in poor workability.

When a nonwoven fabric is obtained by the fluid entanglement method, generally a fluid such as water ejected from a plurality of nozzles impinges on a nonwoven sheet to move and entangle the fibers of the sheet. High energy, thin fluid streams are commonly used to promote sufficient entanglement.

As a result, the nozzle arrangement and rocking and the movement of the nonwoven sheet create a specific pattern of jet trajectory on the surface of the nonwoven fabric, creating grooves and
drawn in the form of ridges. Further, the pattern may be uneven due to clogging of the nozzle or the like. The jet trajectory remaining on the surface of the nonwoven fabric is acceptable depending on the application without any particular problem. However, in fields where aesthetic and decorative surfaces are required, such as wall covering materials, clothing, packaging materials, and covering materials, there is a strict requirement that there be no jet trajectory, especially in applications where dyeing, printing, or print processing is performed. It will be done. That is, when dyeing is performed, staining spots may occur along the trajectory of the jet, and it may be difficult or inconvenient to place fine printed patterns.

In addition, if there are streaks due to nozzle clogging or missing weight, the aesthetic appearance will be significantly impaired. In addition, if there is a strong and deep jet flow trajectory, it is easy to tear along it, and in extreme cases, the barrier properties of the jet flow trajectory portion may be impaired and a sufficient bacterial barrier property may not be obtained as a whole. The fluid-entangled laminated nonwoven fabric having no jet trajectory according to the present invention does not have the disadvantages mentioned above and is extremely versatile. It also has high tolerance to nozzle clogging during manufacturing.

Next, a method for manufacturing the fluid-entangled laminated nonwoven fabric of the present invention will be explained.

First, pulp such as softwood pulp is made into a sheet using a conventional method. In some cases, it may be formed into a sheet by a known airlay method.

Next, short fibers having a fiber length of 15 mm or less are formed into a sheet by a conventional method such as a papermaking method or an airlay method.

These sheets are then overlapped to form a laminated sheet. When a two-layer paper making machine is used, the laminated sheet is formed all at once in the paper making machine.

This laminated sheet is then entangled with a high velocity fluid stream. The fluid here refers to fluid or gas, and water is most preferable in terms of ease of handling, cost, and high collision energy as a fluid. When using water, the water pressure varies depending on the type of yarn used and the basis weight of the paper sheet, but in order to obtain a distance between fiber entanglement points of 300 μm, it is necessary to
~200Kg/cm'', preferably 10~80
Collision is performed within the range of Kg7cm.The lower the basis weight, the lower the water pressure, and the higher the date, the higher the water pressure should be set.Also, for the same basis weight, if the raw yarn has a high Young's modulus, it will be treated with a higher pressure water stream. By doing so, the high strength that is the object of the present invention can be obtained.The diameter of the nozzle that sprays the water stream is preferably 0.01 to 1 mm.The water stream is preferably a columnar stream.

The shape of the trajectory of the water stream may be a straight line parallel to the direction of travel of the paper-made sheet, or it may be a curved shape obtained by the rotational motion of a hegu with a nozzle attached or the vibration motion that reciprocates at right angles to the direction of travel of the sheet. It's okay. The intertwining of multiple circular water flow trajectories obtained by rotational motion increases the jetting area of the water jet against the sheet per nozzle weight, which is efficient, but at the same time, the water flow trajectories may reduce the commercial value depending on the application. It is preferable because it has advantages such as less visible spots and a small strength ratio of warp to warp of the nonwoven fabric. The method of treating the laminated sheet with high-speed water jets may be to spray the water jets alternately on the front and back sides, or to treat only one side. Moreover, the optimum conditions for the number of processing times may be selected depending on the purpose.

Through this entangling process, the constituent fibers of the laminated web are moved by the water flow and become entangled with each other, resulting in a strong bond. Although the fibers mutually move between the laminated webs, they are not completely and uniformly mixed. In the vicinity of the laminated surface, the fibers of both web layers are mixed almost uniformly, but on the front and back sides, within the range of the above entangling conditions, the fiber composition of the original web can be almost maintained. . In addition, in the present invention, extremely strong interlacing bonds occur, especially in layer (B), where the distance between the interlacing points is 3.
00 am or less and a nonwoven sheet having an interlayer peel strength of 500 g/cm or more. Furthermore, its tensile strength and elongation exceed the level of conventional nonwoven fabrics, and it is also highly flexible. Conventionally, it has been thought that high strength cannot be expected from nonwoven fabrics made from short fibers such as those produced by wet-processing, and the effects of the present invention are surprising.

In addition, in order to obtain an entangled laminated nonwoven fabric with no or inconspicuous jet flow trajectory on the surface of the nonwoven fabric, which is one feature of the present invention, it is necessary to select special water jet treatment conditions. Preferably, the treatment is performed by appropriately combining a continuous columnar water stream with relatively low pressure, a columnar water stream with high pressure that collides intermittently, and water sprinkling. In addition, the coverage ratio of the water stream (the value obtained by dividing the total projected area of the water jet nozzle on the treated fabric by the area of the treated fabric) is 10.
It is preferable to set it to 0% or more. A laminated sheet, which is a cloth to be treated, is first treated on a conveyor net with a continuous columnar water stream of 0.2 m+n in diameter under a relatively low pressure in a helical pattern at a coverage rate of 30%. The pressure of the columnar water stream is determined depending on the composition of the laminated seal, the basis weight, and the moving speed of the conveyor net, but it is preferably lower than the pressure of the pulse stream to be processed next. Process the front and back sides alternately.

Next, a similar process is performed using pulsed columnar water streams that collide intermittently. The pulsed water stream can be generated by intermittent interruption of the columnar water stream ejected from the nozzle with an oscillating wire, perforated plate, wire mesh, or the like.

The pulsed columnar flow draws an interrupted dotted line trajectory on the surface of the nonwoven fabric. In this case, the length of the locus of one pulse is arbitrary, but it is preferably 2 mm or less, preferably 1 mm or less. Further, it is desirable that the water pressure of this pulse flow be the highest pressure among the entangling water streams used in the entangling process. The treatment is performed alternately on the front and back surfaces, and the coverage is 100 to 200% based on the nozzle area.

Then treatment is carried out using water spray. The water sprinkling stream is obtained by applying a water spray nozzle or a columnar water stream to a fine mesh wire gauze. The traces of the columnar flow left on the surface in the previous process are smoothed by the water spray, and the pattern of the net conveyor is transferred to the nonwoven fabric, erasing the water flow trajectory. Water spray treatment is also applied to both the front and back sides as necessary. Through the above steps, it is possible to obtain the nonwoven fabric without a jet trajectory according to the present invention.

Of course, depending on the material of the nonwoven fabric, the composition, the basis weight, etc., the conditions of the entangling treatment, such as nozzle diameter, coverage ratio, trajectory pattern, water flow pressure, conveyor net speed, dewatering conditions, number of treatments, shape of the water spray, pulse flow, etc. The purpose of the present invention can be achieved by selecting conditions and the like.

Conventionally, nonwoven fabrics produced using the fluid entanglement method require high-pressure columnar flow treatment to obtain sufficiently high-strength nonwoven fabrics, and as a result, strong jet trajectories remain on the surface of the nonwoven fabric. However, in the present invention, by using short fibers with a short fiber length of 15 fibers or less as raw material fibers, the entanglement of fibers in columnar flow entanglement can be reduced. Optimization can be achieved, sufficiently high strength can be obtained with relatively low water pressure, and traces once formed on the surface can be erased by proceeding with the rearrangement of the fibers. As a result, a nonwoven fabric with excellent strength and surface quality can be obtained.

The nonwoven fabric of the present invention, which is obtained by columnar water jet treatment in a helical pattern, which is one of the preferred embodiments of the production method of the present invention, and which has no jet trajectory on the surface, has excellent strength and surface quality. It also has excellent lint-free properties, which is particularly required for surgical gowns. This is surprising for a nonwoven fabric made of short fibers, but the nonwoven fabric of the present invention uses short short fibers with a fiber length of 15 mm or less, and has a high-density columnar hydroentangled structure with a coverage of 100% or more. This seems to be due to the fact that the fibers are densely intertwined, with a distance between fiber entanglement points of 300 μm or less.

〔Example〕 Hereinafter, the present invention will be explained in more detail with reference to Examples.

In the Examples, the measured values were determined by the following method, and all percentages are by weight.

1) Tensile strength: JISL 1096 strip method 2) Tear strength: JISL 1096 single tongue method 3) Flexibility: JISL 1096 45° cantilever method 4) Distance between m fiber entanglement points: Measured with a scanning electron microscope at 100x magnification, The average value of 50 values was taken.

The distance between fiber entanglement points here refers to Japanese Patent Application Laid-open No. 581912.
80, which is a value measured by the following method known in the art, and is a measure of the intertwining density between fibers, and the smaller the value, the more dense the intertwining. FIG. 1 is an enlarged schematic diagram of the constituent fibers of a wet-laid nonwoven fabric when observed from the surface in a plane direction. The constituent fibers are fI, f2, f2,..., and the point where any two fibers f1 and r2 are intertwined is 81, with the fiber f2 above being below the other fibers. Follow the path to the point of intersection, and let the point of intersection be a2. Similarly a3,
Let it be a4,... Next, the linear horizontal distance between the intersecting points obtained in this way al ag, ag a=,・
..., and find the average value of these many measured values, and use this as the distance between fiber entanglement points.

5) N peel strength; 5 cm, length 1
Cut into 3cm pieces. After attaching adhesive tape (D3200 manufactured by Sony Chemical ■) to this sample, 70g/c
Press and bond together at 200'C with a pressure of m2 for 30 seconds.

A slit is made between the adhesive tape and the nonwoven fabric of the sample for measurement thus obtained, and both ends are gripped with an autograph chuck and measured. The measurement conditions for the autograph are set as follows.

Tensile speed: 10 cm/Illin Chart speed: 10 cm/min The measured value is displayed as the average value of the three highest strengths and the three lowest strengths. Such measurements are carried out in the same manner in the longitudinal direction (MD) and the transverse direction (CD) of the nonwoven fabric, and the average value of the longitudinal and transverse directions is taken as the interlayer peel strength of the nonwoven fabric.

6) Liquid barrier property: After the nonwoven fabric was subjected to the water repellent treatment described below, the water pressure resistance (mmHzO) was measured by a water resistance measurement test according to the JIS L-1092 low water pressure method and was used as an evaluation value of liquid barrier property.

<Water repellent treatment conditions> Fluorine water repellent agent AG433 (manufactured by Asahi Glass) 2
Dip-Nip the nonwoven fabric in % aqueous solution (purity 0.28%)
(Squeezing ratio: 150%) After drying at 100"C for 2 minutes, cure at 160"C for 30 seconds.

Example 1 Softwood pulp was sufficiently beaten using a refiner to reduce the pulp to 1%
The concentration of the slurry was adjusted. On the other hand, short fibers of polyethylene terephthalate (hereinafter abbreviated as PET) fibers of 1 denier and fiber length of 12 mm were similarly prepared into a slurry liquid having a concentration of 1%. Using these two types of slurry, two layers were simultaneously made using a 2N inlet Fourdrinier paper machine, resulting in 50 g of pulp.
A laminated paper sheet made of 50 g/m2 of PET was obtained. From the surface of the PET short fiber layer of this paper sheet, a nozzle diameter of 0.2 cm, a distance between nozzles of 5 n+m, and a nozzle row of 3 nozzles was obtained. 1 0 of the installed nozzle header
Or. p. 30 Kg/ while rotating at m
A columnar water stream with a water pressure of cm2 was injected from a nozzle to entangle the pulp. Then turn the sheet over and apply PE under the same conditions.
The T fiber planes were interlaced. Continuing,●Nozzle direct}10
．． A nozzle header equipped with nozzles of 2mm, 4mm interval between nozzles, and 15 nozzle rows is installed at 10-0'r. p
．． A columnar water stream with a water pressure of 45 Kg/cm was injected from the nozzle while rotating at a speed of 4.5 kg/cm.
Confounding was performed in the order of the faces. At this time, a 20-mesh wire mesh was inserted between the nozzle and the sheet to make the water flow intermittent.

Furthermore, the nozzle diameter is 0.2 mm, the distance between the nozzles is 10 mm,
A nozzle header equipped with nozzles of 10 nozzle rows is arranged in a 30 Or. p. While moving around at m, 1 5
A columnar water stream with a water pressure of 100 kg/cm” is injected from a nozzle,
The pulp side and the PET side were treated in this order. At this time, an 80-mesh wire mesh was inserted between the nozzle and the sheet, and the water flow was made into a sprinkling flow to obtain a smooth pulp/PET entangled laminated nonwoven fabric with no jet trace on the sheet surface. The physical properties of the obtained nonwoven fabric are shown below.

Measuring size (g/m2) 8 0 thickness
(mm) o. 40 tensile strength (M
D/CD Kg/cm) 2. 9/1.
6 Tensile elongation (MD/CD %) 29/63
Tear strength (MD/CD Kg), 1.
5/1. 1 Flexibility (mm) 7
8 Glabella peel strength (g) 5 7 0 Water pressure resistance (
a+mHzo) 3 2 0 Furthermore, when the distance between the fiber entanglement points of the PET fiber layer of this nonwoven fabric was measured, it was 110 l! It was m. Further, when gravure printing was performed on the PET layer surface of this sheet by a conventional method, a smooth and clear printed pattern could be obtained. When this printed nonwoven fabric was used as wallpaper to test its applicability, no adhesive stains were observed, and the test results for reapplicability were also good. When it was peeled off from the wall surface, only the pulp layer surface remained uniformly on the wall surface. On the other hand, the water pressure resistance of this valve/PET laminated nonwoven fabric treated with water repellent treatment is 320 mml.
Disposable medical use (gowns, coverings) because it exhibits extremely high liquid and bacterial barrier properties called hO.
It can also be suitably used.

Example 2 Softwood pulp was subjected to decomposition treatment using a pulper for 5 minutes, and 1%
The concentration of the slurry was adjusted. On the other hand, short fibers of PET fiber with 1 denier and fiber length IQ mm and 0.
A slurry liquid having a concentration of 1% was prepared by mixing short fibers of 15 denier and a fiber length of 5 mm at a weight ratio of 1:1. Using these two types of slurries, papermaking was carried out in the same manner as in Example 1,
Pulbu 60g/I12, PET (1 denier + 0.1
A laminated paper sheet consisting of 60 g/m2 of 5 denier (1:1 mixture) was obtained.

This paper sheet was treated with columnar water jets in exactly the same manner as in Example 1 to obtain a smooth pulp/PET intertwined laminated nonwoven fabric with no jet traces on the sheet surface.

The physical properties of this nonwoven fabric are shown below. In addition, the P of this nonwoven fabric
The distance between the fiber entanglement points of the ET fiber layer is 90 am, and the PE
A thin pattern was printed very clearly on the T fiber layer surface, and the coating property on the wall surface was also good, and there was no wrinkling of the joints due to dimensional changes.

Further improvements in printability, coatability, and liquid barrier properties of this nonwoven fabric are thought to be due to the additive effect of smoothing and packing by mixing 0.15 denier PET ultrafine fibers.

Dimensions (g/mJ 1 0 5 Thickness (n++n) 0.52 Tensile strength (MO/CD Kg/cm) 3.6 /2.
0 tensile elongation (MD/CD%) 2 9/4
9 Flexibility (mm) 8 2 Glabella peel strength (g) 640 Water pressure resistance (mmHzO
) 4 5 0 Example 3 From the 1% concentration pulp slurry obtained in the same manner as in Example 2 and the 1% concentration slurry prepared from short fibers of nylon 6 fibers of 1.5 denier and fiber length 13 mm, Three types of pulp/nylon 6 fibers with different basis weights shown in Table 1 (
Laminated paper sheets A, B, and C) were obtained. While each paper sheet is placed on an 80 mesh net conveyor and moved at a speed of 20 m/min, first, from the surface of the nylon 6 short fiber layer, a nozzle diameter of 0. 2 mm, distance between nozzles 5 m
m, nozzle header equipped with nozzles with 3 nozzle rows is 50 Or. p. While moving around at m, 40
A columnar water jet treatment was carried out at a water pressure of 1 kg/cm''.The sheet was then turned over and the pulp surface was treated and entangled under the same conditions.

The water flow coverage rate in this entanglement process is 36%.

Subsequently, the same nozzle header as above was installed at 500r.
．． p. A columnar water stream of 65 κg/cm was injected from the nozzle while rotating at m, and the entangling treatment was performed 6 times on each surface in the order of the nylon surface and the pulp surface. A wire mesh was inserted to create an intermittent flow.The coverage rate at this time was 144% based on the nozzle area.Next, a nozzle with a nozzle diameter of 0.2 mm, an interval between nozzles of LO mm, and 15 nozzle rows was installed. While rotating the nozzle header at 30 O rpm, an 80 mesh wire mesh was inserted between the nozzle header and the sheet. Processing was performed in the order of the faces. Table 1 shows the physical properties of the obtained interlaced laminated nonwoven fabric. The higher the basis weight ratio of the pulp layer, the higher the liquid barrier property and the lower the strength. On the other hand, as the basis weight ratio of short nylon fibers increases, the strength increases, but the liquid barrier properties tend to decrease.

Table l [Effects of the Invention] The fluid-entangled laminated nonwoven fabric of the present invention has good liquid barrier properties, uniformity,
It has excellent flexibility, physical strength, and surface smoothness, and can be suitably used for wall covering materials, decorative materials, surgical coverings, surgical gowns, etc.

[Brief explanation of drawings]

Figure 1 shows the nonwoven fabric of the present invention. (B) layer side surface It is an enlarged schematic diagram. f, -fff... Constituent fiber Old~a,...intersecting points between structural fibers

Claims (2)

[Claims] 1. A composite nonwoven fabric formed by laminating a three-dimensionally entangled nonwoven fabric layer (A) mainly made of vegetable fiber pulp and a nonwoven fabric layer (B) made of three-dimensionally entangled short fibers with a fiber length of 15 mm or less, the nonwoven fabric layer (A) and the nonwoven fabric layer (B) are integrally bonded by some of their short fibers being mixed and intertwined at the joint, and the nonwoven fabric layer (B) is
The distance between fiber entanglement points of short fibers constituting B) is 300 μm
A non-porous, fluid-entangled nonwoven fabric characterized by: 2. A paper-made sheet mainly made of vegetable fiber pulp and a fiber length of 15 mm or less, fiber length L (mm) and single yarn diameter D (μm
) A high-speed fluid stream ejected from a number of nozzles impinges on a laminate with a sheet formed by paper-making short fibers having a ratio L/D of 0.6 to 2.5 x 10^3. According to
A method for producing a fluid-entangled nonwoven fabric, which comprises three-dimensionally entangling the pulp and short fibers with each other or with each other.