JP2001032157A - Staple fiber nonwoven fabric and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonwoven fabric which does not cause delamination, when having a high METSUKE (weight), and which has an improved texture, when having a low METSUKE. SOLUTION: This staple fiber nonwoven fabric is obtained by laminating a layer consisting mainly of staple fibers to at least one surface of a layer consisting mainly of cotton linters having fiber lengths of <=5 mm, wherein the staple fibers between each other, cotton linters between each other, and the cotton linters and the staple fibers are mutually three-dimensionally and wholly integrally interlaced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a short-fiber nonwoven fabric obtained by entanglement of constituent fibers by high-pressure liquid flow treatment, that is, by a spunlace method.

[0002]

2. Description of the Related Art As a method of obtaining a nonwoven fabric whose shape is maintained by three-dimensionally entangled constituent fibers, there are a spunlace method and a needle punch method. Among them, the nonwoven fabric obtained by the spunlace method is superior in terms of the flexibility of the nonwoven fabric.

[0003] The basis weight of such spunlace nonwoven fabric is as follows:
Generally about 50 g / m ² , and at most 10 g / m ²
0 g / m ² is the limit. That is, in order to obtain a nonwoven fabric having a high basis weight exceeding 100 g / m ² , the fibers present in the surface layer of the nonwoven fabric are entangled and integrated with each other, but the fibers in the inner layer are not sufficiently entangled. There is a problem of peeling. Therefore, a practical nonwoven fabric cannot be obtained by using only the spunlace method as a nonwoven fabric forming means when obtaining a high-weight nonwoven fabric.

[0004] On the other hand, the formation of the spunlace nonwoven fabric reflects the formation of the nonwoven web before the high-pressure liquid flow treatment. However, the lower the basis weight, the more noticeable the gaps between the fibers, and the poorer the formation. The formation of the nonwoven web is determined by the degree of uniformity of the short fibers spread by the carding machine, but there is a limit to improving the spreadability by the carding machine.

[0005]

SUMMARY OF THE INVENTION In order to obtain a practical non-woven fabric which does not cause delamination in spun lace non-woven fabrics in a spun lace non-woven fabric,
The study was conducted to further improve the formation of the nonwoven fabric.

According to the present invention, when a high-weight nonwoven web is subjected to a high-pressure liquid flow treatment, the treatment is further performed at a high water pressure in order to sufficiently entangle the constituent fibers of the inner layer. Although there was a cut portion in response to this, the surface of the nonwoven fabric was fluffy, but the inner layer of the nonwoven fabric was not sufficiently entangled and delamination occurred. Therefore, this phenomenon was further studied.

[0007] Nonwoven webs subjected to a high pressure liquid stream are simply a collection of discrete fibers. When a high-pressure liquid flow collides with the discrete fibers, the energy of the liquid flow is converted to the kinetic energy of the fibers, and the fibers move and become entangled with each other to form an integrated nonwoven fabric. When a high-pressure liquid stream impinges on a high-textured nonwoven web, the energy of the liquid stream is wasted as the surface fibers move, and when the liquid stream reaches the inner layer, there is enough liquid to move the fibers and entangle it. There is no flow energy left. Furthermore, when the liquid flow collides, the fibers on the surface of the nonwoven web are entangled with each other to form a dense structure, and the dense surface serves as a barrier to repel the water flow and consume the liquid flow energy. When the liquid flow reaches the inner layer, there is no remaining energy high enough to move the fibers, so that the fibers of the inner layer cannot be entangled with each other. Therefore, in the obtained nonwoven fabric, only the fibers existing on the surface layer are densely entangled, and the fibers in the inner layer are not sufficiently entangled,
It is assumed that delamination occurs.

Accordingly, the present invention is to provide a nonwoven web having at least an inner layer of fibers having a high mobility and a high entanglement property even if the energy of the water flow is low. An object of the present invention is to provide a spunlace nonwoven fabric that does not cause peeling. Further, the present invention aims to further improve the texture of the spunlace nonwoven fabric by using fibers having high mobility.

[0009]

Means for Solving the Problems The present inventors have reached the present invention as a result of sharp studies to achieve the above object. That is, in the present invention, a layer composed of short fibers is mainly laminated on at least one surface of a layer composed of cotton linter having a fiber length of 5 mm or less, and short fibers are mutually tertiary, and cotton linter and short fiber are mutually tertiary. A nonwoven fabric characterized by being originally entangled and integrated as a whole.

[0010] Further, the present invention provides a papermaking sheet comprising a cotton linter having a fiber length of 5 mm or less, after laminating a short fiber web on at least one side, and then applying a high-pressure liquid flow to the obtained laminate to form a short fiber between the short fibers. It is another object of the present invention to provide a method for producing a nonwoven fabric, characterized in that linters and short fibers and a cotton linter are entangled with each other three-dimensionally and integrated as a whole.

[0011]

Next, the present invention will be described in detail.
The cotton linter used in the present invention is a short fiber remaining in cottonseed and has an average fiber length of 5 mm or less. Cotton linters have much better mobility than short fibers because of the shorter fiber length. Therefore, when a high-pressure liquid flow is applied, the liquid can be sufficiently moved by the energy of the low liquid flow and entangled with the fiber. If the average fiber length of the cotton linter exceeds 5 mm, the mobility tends to be inferior, and when manufacturing a paper sheet, the fibers are entangled during paper forming, and the fibers are not dispersed, so that a sheet with a uniform formation can be obtained. Absent. When such a papermaking sheet is used, if the basis weight is low, the texture of the obtained nonwoven fabric tends to be inferior.

In the nonwoven fabric of the present invention, the cotton linters are three-dimensionally entangled by the action of the high-pressure liquid flow. The shape of the cotton linter is not a so-called linear shape, but has a crimp shape and a semicircular arc shape. Therefore, the fiber length is short but the linters are easily entangled. In addition, bulkiness can be imparted to the nonwoven fabric.

[0013] The nonwoven fabric of the present invention comprises 30 cotton linters.
Preferably, it is contained in an amount of up to 70% by weight. When the content of the cotton linter is less than 30% by weight, delamination does not occur in the high basis weight of the present invention, while in the low basis weight, it is difficult to obtain a nonwoven fabric having a good formation, and the cost is low. Tend to be higher. On the other hand, when the content of the cotton linter exceeds 70% by weight, the obtained nonwoven fabric has an excellent texture, but tends to have poor mechanical properties.

In the present invention, short fibers are also entangled three-dimensionally to maintain the form. The confounding of short fibers
This is performed by a confounding process using a high-pressure liquid flow.

As the short fibers, known natural fibers, regenerated fibers, synthetic fibers, and the like can be used. These fibers can be used alone or in combination of a plurality thereof.

Examples of the natural fiber include cotton, hemp, wool, and silk cut into short fibers. As cotton,
It may be bleached cotton that has been bleached, or bristles obtained from a woven or knitted fabric. Examples of the recycled fiber include cuprammonium rayon, viscose rayon, and solvent-spun rayon (Lyocell). Among these, natural fibers and regenerated fibers are excellent in water absorbency, so that the water absorbency of the nonwoven fabric of the present invention can be improved.

Examples of the synthetic fibers include those made of a polymer having a fiber forming property. Examples of the polymer having a fiber forming property include a polyester polymer, a polyolefin polymer, a polyamide polymer, an acrylic polymer, a polyvinyl alcohol polymer, an aliphatic polyester polymer, and a copolymer containing these as a main component. Examples of the polymer include a polymer and a blend of a plurality of these polymers. The fiber form of the synthetic fiber used in the present invention may be a single-phase form composed of the polymer alone, or a composite form (core-sheath composite form, parallel composite form,
Splitting composite form). The cross-sectional shape of the fiber may be appropriately selected from round, elliptical, rhombic, triangular, T-shaped, and well-shaped.

The fiber length of the short fibers is preferably about 10 to 60 mm from the viewpoint of the entanglement between the fibers and the mechanical strength. Further, in the case of using crimped short fibers, the number of crimps is preferably 5 to 50/25 mm. If the number of crimps is less than 5/25 mm, an unspread portion is likely to be generated at the time of opening, while if it exceeds 50/25 mm, it is difficult to uniformly spread.

Further, when natural fibers, regenerated fibers, or fibers made of an aliphatic polyester polymer are used as the short fibers, the obtained nonwoven fabric has a biodegradability that can be decomposed by microorganisms in the natural world. From the viewpoint of protecting the natural environment, or from the viewpoint of reusing resources because it can be reused, for example, by composting it into fertilizer, it is beneficial from the viewpoint of resource reuse. preferable.

Moreover, this non-woven fabric has biodegradability.
Since it decomposes and disappears after its use, the nonwoven fabric of the present invention
May be appropriately selected according to the application. 50g /
m^TwoOr more, more preferably 50 to 150 g /
m^TwoIt is. The nonwoven fabric of the present invention has a high basis weight (100 g / m^Two
Above), even in the inner layer of the nonwoven fabric,
It is highly entangled and practical without delamination. Book
In the present invention, cotton having excellent mobility and confounding properties
Because of the use of linters,
Low liquid flow energy partially consumed at the surface of Ebb
Even so, the inner layer cotton linter can move
Ton linters are entangled with each other and
Entangled with the short fibers and, as a result,
Spunlace nonwoven fabric that is sufficiently entangled in layers can be obtained
Wear. In addition, since the working efficiency of the high-pressure liquid flow is high,
Even relatively moderate water pressure (50-90 kg / cm
^Two) Can be used to obtain a highly woven nonwoven fabric
You.

The bulk density of the nonwoven fabric of the present invention is 0.13 g / c.
c or less, more preferably 0.10 g / cc.
The following is preferred.

In the nonwoven fabric of the present invention, the formation index is 10
The following is preferred. The formation index is an index indicating that the smaller the numerical value is, the better the formation of the nonwoven fabric is and the more excellent the uniformity of the nonwoven fabric is. In the present invention, a formation having a formation index of 10 or less is regarded as having a good formation.

The formation index is obtained from the density unevenness when transmitted light is applied to the nonwoven fabric using a formation measurement machine (IMAGE ANALYZER V10 manufactured by Toyobo Co., Ltd.), and the following (1) and (2) It is calculated from the formula. That is, ten samples (15 cm × 15 cm) are prepared, and each sample has a transmittance (Tij) over the entire area of the sample.
Is measured, the standard deviation and the average transmittance are calculated from the transmittances of the obtained samples, and the formation index is determined from the equation (2). Tij = (Dsij / Doij) × 100 (1) Tij: transmittance of (i, j) pixel Doij: density of (i, j) pixel of illumination image DSij: (i, j) of sample image Pixel density Formation index = ((standard deviation) / (average transmittance)) × 100 (2)

The nonwoven fabric of the present invention can be efficiently produced, for example, by the following method. First, using a cotton linter having an average fiber length of 5 mm or less obtained from cottonseed as a main raw material, the paper is made by a known wet papermaking method. At this time, the basis weight of the papermaking sheet made of cotton linter is preferably 30 to 80 g / m ² . The basis weight is 3
If it is less than 0 g / m ^2, it is difficult to obtain a sheet having a uniform formation in the production of a papermaking sheet, and the formation of the obtained nonwoven fabric may be easily reduced. on the other hand,
If the basis weight exceeds 80 g / m ² , when the short fiber web is laminated on the paper sheet made of the cotton linter and subjected to the high-pressure liquid flow treatment, the paper sheet made of the cotton linter and the constituent fibers of the short fiber web become three-dimensional. Entanglement is not sufficient, and it is difficult for the whole to be integrated.
For the above reasons, the basis weight of the sheet is 30 to 50 g / m2.
^It is preferably in the range of ² .

On the other hand, a short fiber web is prepared. As a method for preparing the short fiber web, a known method may be used. The short fiber is spread by carding to prepare a short fiber web. Depending on the degree of arrangement of the constituent fibers, the short fiber web may be a parallel card web arranged in the traveling direction of the card machine, a web in which the parallel card web is cross-laid, a random card web, or a medium between the parallel card web and the random card web. There are arranged semi-random webs and the like, which may be appropriately selected depending on the application.

Then, after laminating a short fiber web on at least one surface of the obtained sheet made of cotton linter, the laminate is subjected to a high-pressure liquid flow treatment so that cotton linters, short fibers and cotton linter are short-circuited. The fibers and the fibers are three-dimensionally entangled with each other and integrated as a whole. When it is desired to obtain a higher nonwoven fabric, a nonwoven fabric that is strongly entangled and integrated into the inner layer of the obtained nonwoven fabric is formed by forming a laminate of three layers of short fiber web / cotton linter / short fiber web. It is possible to obtain.

In the high-pressure liquid flow treatment, for example, a large number of injection holes having a hole diameter of 0.05 to 2.0 mm, particularly 0.1 to 0.4 mm are arranged in a line or a plurality of lines with a hole interval of 0.3 to 10 mm. A high-pressure liquid stream having an ejection pressure of 5 to 150 kg / cm ² G is ejected from the ejection hole using the orifice head thus formed. The injection holes are arranged in a row in a direction orthogonal to the traveling direction of the laminate. Generally, water or hot water is used as the high-pressure liquid. The distance between the injection holes and the laminate is preferably between 1 and 15 cm. This distance is 1c
If the distance is less than 15 m, the formation of the laminated non-woven fabric obtained by this treatment is disturbed. On the other hand, if the distance exceeds 15 cm, the impact force when the liquid stream collides with the laminate is reduced, and the three-dimensional confounding is sufficiently performed. Difficult to give.

The high-pressure liquid flow treatment may be performed in two stages. First, as the first stage processing, the pressure is 40 kg /
A high-pressure liquid flow of not more than cm ² G, preferably 5 to 40 kg / cm ² G is jetted to impinge on the laminate to preliminarily entangle the fibers. In the processing of the first stage, if the pressure of the liquid flow is less than 5 kg / cm ² G, it becomes difficult to perform pre-entanglement. On the other hand, the pressure of the liquid flow is 40 kg / cm ² G
When it exceeds, when the high-pressure liquid flow is jetted and collides with the laminate, the fibers in the surface layer of the laminate are disturbed by the action of the liquid flow, and as a result, the obtained nonwoven fabric is disturbed in formation and has uneven spots. Cheap.

Next, the second step is performed at a higher water pressure than in the first step. Preferably 40 to 100 kg /
A high-pressure liquid stream having a pressure of ² cm is injected to collide with the laminate, and the cotton linters, the cotton linter and the short fibers, and the short fibers are three-dimensionally entangled to integrate the laminate as a whole. If the pressure of the liquid flow is less than 40 kg / cm ² G in the treatment of the second stage, it is difficult to sufficiently form the three-dimensional entanglement between the fibers as described above. 100kg / cm
^If it exceeds ² G, the cotton linter having a short fiber length is likely to pass through the support material, and the yield of the completed nonwoven fabric is deteriorated, which is not preferable.

When the high-pressure liquid flow treatment is performed, the support for supporting the laminate may be a high-pressure liquid flow, for example, a mesh screen such as a 20 to 100 mesh wire mesh or a perforated plate, which may pass through the laminate and the support. It is not particularly limited as long as it is one.

When applying a high-pressure liquid flow to a laminate in which a papermaking sheet made of cotton linter and a short fiber web are laminated, the high-pressure liquid flow is preferably injected with the papermaking sheet side facing upward. If the papermaking sheet is on the lower side, the cotton linter having a short fiber length will fall through the support material, and the yield of the substantially completed nonwoven fabric will deteriorate. When the papermaking sheet is placed on the upper side, the separated cotton linters by the action of the high-pressure liquid flow enter the short fiber web, and the cotton linters and the cotton linter and the short fibers are entangled in the short fiber web. Also,
Because the short fiber web located on the lower side of the papermaking sheet receives the cotton linter that has invaded and entangles with each other,
The cotton linter is prevented from reaching the mesh screen and falling off, and the yield is improved.

When a high-pressure liquid flow is applied, a short fiber web is laminated on at least one side of the papermaking sheet as a laminate, but a short fiber web may be laminated on both sides of a papermaking sheet made of cotton linter. When the short fiber webs are laminated on both sides of the sheet, the short fiber webs on both sides may be made of the same material, or may be made of different materials, depending on the application. May be selected as appropriate. In addition, when laminating short fiber webs on both sides of the papermaking sheet, the laminated body subjected to the entanglement treatment from one side by the above method is inverted, and the same entanglement treatment is performed from the opposite side in the same manner, so that the two sides are integrated. A non-woven fabric can be obtained.

After the high-pressure liquid flow treatment, excess moisture is removed from the treated laminate. To remove this excess water,
A known method can be adopted. For example, the excess moisture is mechanically removed to some extent using a squeezing device such as a mangle roll, and the remaining moisture is subsequently removed using a drying device such as a continuous hot air dryer to obtain a nonwoven fabric.

[0034]

Next, the present invention will be specifically described based on examples, but the present invention is not limited to these examples. In the examples, physical properties and the like were measured by the following methods. The formation index of the nonwoven fabric was as described above.

(1) Weight of nonwoven fabric (g / m ² ): A total of 10 sample pieces of 10 cm long × 10 cm wide were prepared from a sample in the standard state, and after reaching equilibrium moisture, the weight of each sample piece ( g) was weighed, and the average of the obtained values was converted per unit area (m ² ) to obtain the basis weight (g / m ² ).

(2) Tensile strength of nonwoven fabric (kg / 5cm
Width): Measured according to the method described in JIS-L-1096A. That is, ten sample pieces each having a sample length of 15 cm and a sample width of 5 cm were created in the machine direction (MD) of the nonwoven fabric, and a constant-speed elongation-type tensile tester (Orientec) was prepared for each sample piece in the MD direction of the nonwoven fabric. Manufactured by Tensilon UTM-10
0), the sample gripping interval was 10 cm, and the pulling speed was 1
Stretched at 0 cm / min. Then, the average value of the obtained load values at cutting (kg / 5 cm width) was determined as the tensile strength (kg / 5 cm).
Width).

(3) Tensile elongation (%) of the nonwoven fabric: In the above tensile strength measurement, the elongation (%) at the maximum load when the sample piece was elongated was determined, and the average value of the obtained elongations was calculated. The tensile elongation (%) was used.

(4) Bulk density of nonwoven fabric (g / cc): Five sample pieces each having a sample width of 10 cm and a sample length of 10 cm were prepared, and 3 g / c was measured with a thickness measuring device (manufactured by Daiei Kagaku Seiki Seisakusho KK).
The thickness (mm) of each nonwoven fabric was measured by applying a load of m ² , the average value was defined as the thickness (mm), and the value obtained by the following formula was defined as the bulk density of the nonwoven fabric. Bulk density (g / cc) =
[Eye weight (g / m ² ) / Thickness (mm)] / 1000

(5) Water absorption (mm / 10 minutes): JIS-
It was measured according to the Bilek method described in L-1096.

(6) Delamination: It is checked whether the constituent fibers are sufficiently entangled with each other up to the inner layer by visual inspection and touch.
The evaluation was made in two steps. ；: The fibers are sufficiently entangled with each other up to the inner layer, and no delamination occurs. X: The fibers of the inner layer are not entangled and delamination occurs.

(7) Biodegradability: A sample piece is buried in the soil and taken out two years later. When the sample does not retain the form of the nonwoven fabric, or when it retains the form, the tensile strength of the nonwoven fabric before the burying is maintained. When it was reduced to 50% or less, it was evaluated that the decomposability was good.

Example 1 As a sheet made of a cotton linter, a cotton linter having an average fiber length of 3 mm was used.
/ M < ² > paper sheet was produced.

On the other hand, the short fiber web has an average fiber length of 2
Using bleached cotton of 5 mm cotton, the basis weight is 25 g / m ²
Made a random card web.

Laminating a papermaking sheet on a short fiber web,
Move the laminate so that the papermaking sheet side is up 100
Using an orifice head placed on a mesh metal net and arranged in a row with a hole diameter of 0.6 mm, an injection pressure of 40 kg / cm ² G was applied from a position 50 mm above the laminate.
Pre-entanglement treatment with the high pressure liquid flow of Continued
The confounding treatment was performed by a high-pressure liquid flow having an injection pressure of 70 kg / cm ² G. After the confounding treatment, excess water was removed by a mangle, which is a known water removing device, and then dried at 90 ° C. using a suction band type dryer.

The obtained nonwoven fabric is a nonwoven fabric in which the short fibers constituting the short fiber web and the cotton linter are entangled with each other, and the staple fibers and the cotton linter are entangled with each other, and are densely integrated. there were. Table 1 shows the performance of the obtained nonwoven fabric.

Example 2 In Example 1, the basis weight of the sheet made of cotton linter was 100 g / m ² and the basis weight of the short fiber web was 50.
A non-woven fabric was obtained in the same manner as in Example 1 except that g / m ² was used. Table 1 shows the performance of the obtained nonwoven fabric.

Example 3 In Example 1, the basis weight of the paper-made sheet made of cotton linter was 150 g / m ² and the basis weight of the short fiber web was 50.
A non-woven fabric was obtained in the same manner as in Example 1 except that g / m ² was used. Table 1 shows the performance of the obtained nonwoven fabric.

Example 4 In Example 1, the basis weight of the sheet made of cotton linter was 100 g / m ² , the basis weight of the short fiber web was 70 g / m ^2, and the order of the short fiber web / paper sheet / short fiber web was as follows. A nonwoven fabric was obtained in the same manner as in Example 1 except that the laminated product (basis weight: 240 g / m ² ) was subjected to a high-pressure liquid flow treatment. Table 1 shows the performance of the obtained nonwoven fabric.

Example 5 A nonwoven fabric was obtained in the same manner as in Example 1 except that rayon fibers having a fineness of 2 denier and a fiber length of 51 mm were used as the short fibers. Table 1 shows the performance of the obtained nonwoven fabric.
Shown in

Example 6 A nonwoven fabric was obtained in the same manner as in Example 1 except that polylactic acid fibers having a fineness of 2 denier and a fiber length of 51 mm were used as the short fibers. Table 1 shows the performance of the obtained nonwoven fabric.
Shown in

Example 7 A nonwoven fabric was obtained in the same manner as in Example 1 except that polyethylene terephthalate short fibers having a fineness of 1.3 denier and a fiber length of 38 mm were used as the short fibers.
Table 1 shows the performance of the obtained nonwoven fabric.

Comparative Example 1 In Example 1, the basis weight of the short fiber web was 150 g / m
A random nonwoven fabric consisting only of the short fiber web was obtained in the same manner as in Example 1 except that the random card web of No. ² was prepared and the papermaking sheet was not laminated. Table 1 shows the performance of the obtained nonwoven fabric.

[0053]

[Table 1] As is clear from Table 1, the nonwoven fabrics of Examples 1 to 7 are:
Both are nonwoven fabrics obtained by laminating a short fiber web on at least one side of a papermaking sheet made of the cotton linter of the present invention and performing an entanglement treatment, so that the mechanical properties are excellent, the formation is excellent, and the water absorption is also excellent. It was excellent. In Example 4, the total basis weight was as high as 240 g / m ² , but the fibers were sufficiently entangled in the inner layer, and had sufficient practical mechanical strength. In Examples 1 to 6, the biodegradable short fibers were used, and after burying in the soil, the decomposition progressed to an extent that the form of the nonwoven fabric was not maintained after two years, It was gentle on the environment and did not cause environmental pollution.

On the other hand, in Comparative Example 1, an attempt was made to obtain a nonwoven fabric having a high basis weight (basis weight: 150 g / m ² ) consisting only of short fibers, but the constituent fibers were entangled only in the surface layer, and were sufficiently entangled to the inner layer. No delamination occurred, and a nonwoven fabric could not be obtained.

[0055]

The present invention is a nonwoven fabric comprising a layer mainly composed of cotton linter and a layer mainly composed of short fibers, wherein the constituent fibers are three-dimensionally entangled. By using cotton linter as a constituent fiber, even when trying to obtain a high-weight nonwoven fabric, the cotton linter with excellent mobility and entanglement is present in the inner layer, so that the fibers are sufficiently entangled with each other. Therefore, a spunlaced nonwoven fabric having practical mechanical strength can be obtained. Further, even at the pressure of the high-pressure liquid flow at that time, the entanglement can be sufficiently performed with relatively low hydraulic energy, which is advantageous in terms of cost.

Further, by performing a entanglement treatment on a laminate obtained by laminating a papermaking sheet made of a cotton linter having excellent texture on a short fiber web, the cotton linter having high mobility enters the gaps between the short fiber webs and is entangled. For,
A nonwoven fabric with excellent formation can be obtained.

Further, the texture of the cotton linter also serves as the short fiber nonwoven fabric, so that a nonwoven fabric having good flexibility and excellent touch can be obtained.

The nonwoven fabric of the present invention has the above-mentioned effects, and can be applied to a wide range of uses such as medical and sanitary materials, living-related materials, and agricultural materials.

Claims (3)

[Claims] 1. A layer mainly composed of cotton linter having a fiber length of 5 mm or less, wherein a layer composed of short fibers is laminated on at least one surface, and the short fibers are mutually three-dimensionally cross-linked with each other and between the cotton linter and the short fiber. Short fiber non-woven fabric characterized by being entangled and integrated as a whole. 2. The short-fiber nonwoven fabric according to claim 1, wherein the formation index is 10 or less. 3. A short-fiber web is laminated on at least one surface of a sheet made of cotton linter having a fiber length of 5 mm or less, and then a high-pressure liquid flow is applied to the obtained laminated body to produce short fibers, short cotton linters and short fibers. A method for producing a short-fiber nonwoven fabric, wherein fibers and cotton linter are three-dimensionally entangled with each other and integrated as a whole.