JPH073606A - Laminated non-woven fabric and production thereof - Google Patents

Abstract

PURPOSE:To provide a laminated non-woven web having a high tension and a high strength and excellent in surface abrasion resistance, dimensional stability, water absorption, wiping property, flexibility and skin touch. CONSTITUTION:A laminated non-woven fabric is characterized by laminating a web layer B comprising reclaimed cellulosic short fibers to at least one surface of a web layer A comprising thermoplastic synthetic filaments, integrating the web layer A with the web layer B with the three-dimensional interlacing between the cellulosic short fibers and the thermoplastic filaments, and, if necessary, partially thermally adhering the thermoplastic synthetic filaments each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention comprises a web layer A made of thermoplastic synthetic filaments and a web layer B made of short fibers of cellulose-based fibers laminated on at least one side of the web layer A. It has excellent surface abrasion resistance, dimensional stability, water absorption, wiping property, flexibility and touch feeling. Especially, in addition to packaging materials, cover materials such as disposable chair covers and table cloths, printing wiping cloths and disposables. The present invention relates to a laminated nonwoven fabric that can be suitably used as a material for underwear and the like, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, there has been a demand for a non-woven fabric having both strength which is a characteristic of thermoplastic synthetic filaments and water absorbency and flexibility which is a characteristic of short cellulosic fibers. Laminated non-woven fabrics have been used in which non-woven fabrics composed of plastic synthetic long fibers and non-woven fabrics composed of short cellulosic fibers are laminated. This laminated non-woven fabric is produced by laminating the thermoplastic synthetic long-fiber non-woven fabric and the cellulosic short-fiber non-woven fabric, and then fixing and integrating the constituent fibers by heat fusion or using a binder.

However, as described above, this laminated non-woven fabric is used because, when the thermoplastic synthetic long-fiber non-woven fabric and the cellulosic short-fiber non-woven fabric are laminated and integrated, the constituent fibers are fixed to each other by heat bonding or using a binder. Although it is excellent in strength, it has a problem that water absorption and wiping properties, which are characteristics of cellulosic fibers, are impaired, and the cellulose fibers become hard and the feel to the touch is deteriorated. Moreover,
This nonwoven fabric has a problem that the surface abrasion resistance is inferior because the cellulose-based short fibers present in the surface layer are not sufficiently fixed to each other.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above problems and comprises a web layer A made of thermoplastic synthetic continuous fibers and a web layer B made of short staple fibers of cellulose type laminated on at least one surface of the web layer A. An object of the present invention is to provide a laminated nonwoven fabric having high tensile strength and excellent in surface abrasion resistance, dimensional stability, water absorption, wiping property, flexibility and touch feeling. Another object of the present invention is to provide a method capable of efficiently producing the laminated nonwoven fabric.

[0005]

The present inventors have arrived at the present invention as a result of intensive studies to solve the above problems. That is, the present invention is: At least one side of a web layer A made of thermoplastic synthetic long fibers is laminated with a web layer B made of cellulose short fibers, and the web layers A and B are made of short cellulose fibers and thermoplastic synthetic fibers. 1. A laminated non-woven fabric characterized by being integrated by three-dimensional entanglement with fibers, A web layer B made of short staple cellulose fibers is laminated on at least one surface of a web layer A made of thermoplastic synthetic long fibers, and the web layers A and B are short staple fibers of cellulose fiber and thermoplastic synthetic long fibers. 2. A laminated non-woven fabric, which is integrated by three-dimensional entanglement with the thermoplastic synthetic filaments and is partially heat-bonded to each other. A web layer B made of short staple cellulose fibers is laminated on at least one surface of a web layer A made of thermoplastic synthetic long fibers, and the web layers A and B are short staple fibers of cellulose fiber and thermoplastic synthetic long fibers. In a laminated non-woven fabric, which is integrated by three-dimensional entanglement between the thermoplastic synthetic filaments and the thermoplastic synthetic filaments are partially heat-bonded to each other, the thermoplastic synthetic filaments have a sheath component of a polyolefin-based polymer and a core component. 3. A laminated non-woven fabric characterized by being a core-sheath type composite long fiber made of a thermoplastic synthetic polymer having a melting point at least 30 ° C. higher than the melting point of the polyolefin-based polymer. A web layer B made of short staple cellulose fibers is laminated on at least one surface of a web layer A made of thermoplastic synthetic long fibers, and then a high-pressure liquid columnar flow is injected to spray short fibers of the cellulose staple fibers and thermoplastic long synthetic fibers. 4. A method for producing a laminated non-woven fabric, characterized in that the web layer A and the web layer B are integrated by three-dimensionally entangled with each other. A web layer B made of short staple cellulose fibers is laminated on at least one surface of a web layer A made of thermoplastic synthetic long fibers, and then a high-pressure liquid columnar flow is injected to spray short fibers of the cellulose staple fibers and thermoplastic long synthetic fibers. A method for producing a laminated non-woven fabric, characterized in that the thermoplastic synthetic filaments are partially heat-bonded after the web layer A and the web layer B are integrated by three-dimensionally entangled with each other. It is what

Next, the laminated nonwoven fabric of the present invention will be described. The laminated nonwoven fabric of the present invention comprises a web layer A made of thermoplastic synthetic long fibers and a web layer B made of short fibers of cellulose-based fibers laminated on at least one surface of the web layer A.

The web layer A made of thermoplastic synthetic continuous fibers referred to in the present invention is composed of continuous fibers of ordinary fiber-forming thermoplastic synthetic polymer, and is produced by the so-called spunbond method. Is. The fiber-forming thermoplastic synthetic polymer is a polyester-based polymer, a polyamide-based polymer or a polyolefin-based polymer, and each has a fiber-forming property. Examples of the polyester-based polymer include a polyester polymer in which 80 mol% or more of the main repeating unit is ethylene terephthalate, or a copolyester including a conventionally known acid component and a glycol component. Examples of the acid component of the copolyester include isophthalic acid and adipic acid, and examples of the glycol component include propylene glycol and diethylene glycol. Examples of the polyamide polymer include nylon 6, nylon 66, nylon 610, nylon 46 and the like. As the polyolefin-based polymer, linear low-density polyethylene,
Examples include ordinary low density polyethylene, medium density polyethylene, high density polyethylene and the like. In the thermoplastic synthetic polymer, various additives such as ordinary antioxidants, matting agents, pigments, antistatic agents, etc. are added to the thermoplastic synthetic polymer, if necessary, in such a range that fiber formation properties are not hindered. If it is contained, it may be contained. When a long fiber made of a polyester polymer or a polyamide polymer is used as the thermoplastic synthetic long fiber, the polyester polymer or the polyamide polymer having excellent strength maintains the tensile strength of the web layer A. A non-woven fabric having excellent mechanical performance can be obtained.

The web layer A does not necessarily have to be made of a single synthetic long fiber, but may be made of two or more types of synthetic long fibers. Further, the thermoplastic synthetic continuous fiber is not limited to the one composed of a single polymer, and may be a composite continuous fiber composed of two or more kinds of polymer components. As the sheath component, a core-sheath type composite filament may be used in which the sheath component is a polyolefin polymer and the core component is a thermoplastic synthetic polymer having a melting point at least 30 ° C. higher than the melting point of the polyolefin polymer. Examples of the thermoplastic synthetic polymer that constitutes the core component of the composite long fiber include polyester-based polymers and polyamide-based polymers. When this composite long fiber is used, when the web layers A and B are laminated and integrated and then subjected to a heat-bonding treatment, the thermoplastic synthetic composite long fibers are partially bonded by fusion of the sheath component polymer. Which is heat-bonded to each other, and the thermoplastic polymer constituting the core component of the composite long fiber has a high melting point and a high strength, so that the tensile strength of the web layer A is maintained and the nonwoven fabric has an extremely excellent mechanical performance. Can be obtained.

The thermoplastic synthetic continuous fibers constituting the web layer A have a single yarn fineness of 10 denier or less, preferably 5 denier or less. When the single yarn fineness exceeds 10 denier, it becomes difficult to sufficiently perform three-dimensional entanglement between the fibers when the web is processed by the high-pressure liquid columnar flow, and when the nonwoven fabric is formed, the tensile strength is low and the flexibility is reduced. Therefore, it is not preferable. The smaller the monofilament fineness, the more flexible a nonwoven fabric can be obtained, but if it is too small, the yarn breakage during melt spinning will increase and the spinnability at the time of spinning will decrease, or the tensile strength of a nonwoven fabric will increase. Is too low, which is not preferable. Usually, it is preferable to set it to at least about 0.5 denier.

The above-mentioned thermoplastic synthetic filaments have a circular cross-sectional shape, or various irregular cross-sectional shapes such as a triangle, a quadrangle, and a flat shape. It may also have a hollow cross-sectional shape.

The web layer A has a basis weight of 3 to 100 g / m.
² , preferably 5 to 50 g / m ² . When the basis weight is less than 3 g / m ² , it becomes difficult to sufficiently perform three-dimensional entanglement between the fibers when the web is processed by the high pressure liquid columnar flow, and the tensile strength becomes low when the nonwoven fabric is formed, which is not preferable. On the other hand, if the basis weight exceeds 100 g / m ² , the columnar flow does not sufficiently penetrate the web when the web is treated with the high-pressure liquid columnar flow, and it becomes difficult to sufficiently three-dimensionally entangle the fibers, resulting in a nonwoven fabric. At this time, the tensile strength becomes low, which is not preferable.

In the present invention, the web layer B made of short fibers of cellulosic short fibers means a natural fiber such as cotton or hemp, a semi-synthetic fiber such as rayon, or a yarn or a woven fabric made of a mixture of two or more kinds of these fibers or It refers to the one obtained from a knitted fabric, which is simply bleached or exposed to fluorescent light and dyed.

The anti-pulling machine that can be effectively used in the present invention is a rag machine, a knot breaker, a garnet machine, a slicing machine and the like. The type and combination of anti-fluffing machines to be used depend on the shape of the fabric to be fluffed, the thickness of the threads and the strength of the twist, but two or more of the same anti-fluffing machines can be connected in series. It is effective to use a combination of the above anti-fluffing machines. Here, the defibration rate by the anti-pulling machine is 3
The range of 0 to 95% is preferable. When the defibration rate is less than 30%, the columnar flow does not sufficiently penetrate the web when the web is treated with the high pressure liquid columnar flow, and when the defibration rate exceeds 95%, sufficient surface abrasion strength cannot be obtained. The defibration rate is obtained by the formula shown below.

Disentanglement rate (%) = (weight of fluff-weight of filamentous material)
× 100 / weight of fluff A web is formed by carding or a papermaking method using the fluff obtained by the above method. The short cellulose fiber fluff web is entangled by the above-mentioned high pressure liquid columnar flow method, needle punch method, stitch bond method or the like in order to have tensile strength as required.

The thickness of the web layer B may be arbitrarily selected according to the application, but the basis weight is 10 to 200 g / m ² , preferably 15 to 100 g / m ² . Weight is 1
When it is less than 0 g / m ^2, it is not preferable because the water absorbency, the flexibility and the feel to the touch are reduced when it is made into a nonwoven fabric. It is sufficient that the basis weight is 200 g / m ^{2 at most,} and when it exceeds 200 g / m ² , the columnar flow does not sufficiently penetrate the web when the web is treated with the high-pressure liquid columnar flow, so that the fibers are sufficiently interspaced between the fibers. It is not preferable because it becomes difficult to perform three-dimensional entanglement, the peel strength becomes low when a nonwoven fabric is formed, and the manufacturing cost increases, which is uneconomical.

In the laminated nonwoven fabric of the present invention, the web layer A made of the above-mentioned thermoplastic synthetic filaments is laminated on at least one side thereof with the web layer B made of the above-mentioned short fibers of cellulosic fibers, and the web layers A and B are laminated. Is integrated by three-dimensional entanglement between short fibers of cellulose-based fibers and thermoplastic synthetic long fibers. The three-dimensional entanglement is a three-dimensional entanglement of the constituent fibers of the web layers A and B by the injection of the high-pressure liquid columnar flow. Further, the thermoplastic synthetic long fibers of the web layer A made of the thermoplastic synthetic long fibers are partially heat-bonded to each other.

The laminated nonwoven fabric of the present invention has practically sufficient tensile strength because the constituent fibers of the web layers A and B are three-dimensionally entangled, and the composite between the web layers A and B is also present. No peeling occurs on the surface. Also,
By partially heat-bonding the constituent fibers of the web layer A, the strength is further improved, and peeling between the web layers A and B on the composite surface can be reliably prevented. Particularly, as the thermoplastic synthetic continuous fiber, a core-sheath type composite continuous fiber having a sheath component made of a polyolefin-based polymer and a core component made of a thermoplastic synthetic polymer having a melting point at least 30 ° C. higher than the melting point of the polyolefin-based polymer is used. The tensile strength is further improved.

Next, the method for producing the laminated nonwoven fabric of the present invention will be described. In the method for producing a laminated nonwoven fabric according to the present invention, first, at least one surface of a thermoadhesive web layer A made of a thermoplastic synthetic long fiber is provided on at least one side thereof and a web layer B made of short fibers of a cellulosic fiber.
Is laminated, and then the high-pressure liquid columnar flow is jetted to three-dimensionally entangle the short fibers of the cellulose fiber and the thermoplastic synthetic long fibers to integrate the web layer A and the web layer B. Further, after the web layer A and the web layer B are integrated by the three-dimensional entanglement, the thermoplastic synthetic long fibers are partially heat-bonded to each other as necessary.

In the method of the present invention, the web layer A made of the thermoplastic synthetic continuous fiber is melt-spun out from the fiber-forming thermoplastic synthetic polymer by using an ordinary melt spinning apparatus, cooled, and then opened. It can be manufactured by a so-called spunbond method in which a long fiber web A having a predetermined basis weight is deposited on the moving zone. In addition, when converting to the web,
Various methods such as a normal parallel array method, a cross array method, a parallel cross array method or a random method can be adopted.
After the web formation and before the high pressure liquid columnar flow treatment, the obtained web layer A should not be subjected to a treatment such as heat fusion or welder adhesion which lowers the degree of freedom of the constituent fibers. When the obtained web layer A is subjected to a treatment such as heat fusion or welder adhesion, the constituent fibers of the web layer A are fixed to each other,
In the high pressure liquid columnar flow treatment of the next step, it is not preferable because sufficient three-dimensional entanglement cannot be performed between the constituent fibers, so that not only the peel strength is reduced when the nonwoven fabric is formed, but also the flexibility and the feel to the touch are reduced. .

In the method of the present invention, when laminating the web layer B made of the above-mentioned short fibers of cellulosic fiber on at least one side of the web layer A, the web layers B and A are separately prepared and then both web layers are formed. Or the short fibers of cellulosic fibers are directly deposited on the surface of the web layer by laminating or spraying. As the method, a parallel array method using an ordinary card machine or a cross array method using a cross webber can be adopted. Moreover, as a spray method,
A so-called air ray method in which the short fibers of cellulose-based fibers are directly blown onto the surface of the web layer A together with air can be adopted.

When the web layer B is laminated on both sides of the web layer A, the web layer B is once laminated on one side of the web layer A, and then on the other side of the web layer A as described above. It is good to carry out the lamination.

In the method of the present invention, since the web layer B made of the above-mentioned short fibers of cellulosic fibers is laminated on at least one side of the web layer A made of the thermoplastic synthetic long fibers, the method for laminating the web layer B is as follows. Even if the parallel arrangement method using a normal card machine is adopted, the difference in tensile strength in the longitudinal and transverse directions does not become large when a laminated nonwoven fabric is used.

In the method of the present invention, the laminated web is subsequently subjected to a high pressure liquid columnar flow treatment on the laminated web. The high-pressure liquid columnar flow treatment uses a nozzle having a hole diameter of 0.05 to 0.5 mm,
The liquid is jetted at a pressure of 25 to 150 kg / cm ² . As the high-pressure liquid, water at room temperature may be used from the economical point of view. When the pressure of the high-pressure liquid is less than 25 kg / cm ² , the columnar flow does not sufficiently penetrate the web, it becomes difficult to sufficiently three-dimensionally entangle the fibers, and the tensile strength of the nonwoven fabric decreases, which is preferable. Absent. On the other hand, when the pressure of the high-pressure liquid exceeds 150 kg / cm ² , the pressure is too high and the fibers are damaged when the columnar flow penetrates the web,
When a nonwoven fabric is used, the tensile strength is reduced, which is not preferable. This high-pressure liquid columnar flow treatment three-dimensionally entangles the constituent fibers of the web layers A and B. Therefore, the obtained laminated non-woven fabric has high tensile strength, and peeling does not occur on the composite surface between the web layers A and B. In addition, this high-pressure liquid columnar flow treatment,
It may be carried out multiple times, if necessary.

In the method of the present invention, subsequent to the above-mentioned high pressure liquid columnar flow treatment, the laminated web layers are subjected to a heat-bonding treatment, if necessary, so that the constituent fibers of the web layer A are partially heat-bonded. The heat-bonding treatment uses an ordinary heat-embossing roller, the roller temperature is not higher than the melting point of the constituent fibers of the web layer A, the linear pressure is 5 to 100 kg / cm, and the pressure contact area ratio is 3 to
25%. When the roller temperature exceeds the melting point of the constituent fibers, not only the strength is lowered when the fibers are melted during the heat-bonding treatment to form a non-woven fabric, but the non-woven fabric itself exhibits a film-like shape, and the softness and touch feeling are reduced. Not preferable.
As the constituent fibers of the web layer A, a core-sheath type composite continuous fiber comprising a polyolefin polymer as a sheath component and a thermoplastic synthetic polymer having a core component having a melting point at least 30 ° C. higher than the melting point of the polyolefin polymer is used. When used,
The roller temperature is preferably between the melting points of both polymers.
In this heat-bonding treatment, the constituent fibers of the web layer A are partially heat-bonded. Therefore, the obtained laminated nonwoven fabric has high tensile strength.

[0025]

In the laminated nonwoven fabric of the present invention, the web layer A made of the thermoplastic synthetic long fibers is laminated with the web layer B made of the short fibers of the cellulosic fiber on at least one side thereof, and the web layers A and B are laminated. Is a cellulosic short fiber fluff and thermoplastic synthetic long fibers are integrated by three-dimensional entanglement, the thermoplastic synthetic long fibers themselves and the three-dimensional entanglement practically sufficient tensile strength and Maintains dimensional stability, and exhibits excellent water absorbency, flexibility, and feel to the touch due to the fluff of the cellulose-based short fibers. Moreover,
The two web layers A and B are integrated by three-dimensional entanglement of the thermoplastic synthetic long fibers and short fibers of cellulosic short fibers, and the fibers are formed by thermal bonding or using a binder like a conventional laminated nonwoven fabric. Since they are not fixed to each other, excellent water absorption, flexibility, and touch feeling, which are characteristics of the cellulose-based short fibers, are well retained. In addition, the partially remaining filamentous cellulose-based short fibers contribute to the improvement of the surface friction resistance.

Furthermore, apart from the three-dimensional entanglement, the thermoplastic synthetic filaments are partially heat-bonded to each other,
Furthermore, high tensile strength and good dimensional stability can be maintained.

[0027]

EXAMPLES Next, the present invention will be specifically described based on Examples. The melting point, tensile strength and surface abrasion strength in the examples were measured by the following methods.

Melting point (° C.): Determined from a DSC curve obtained by measuring a sample amount of about 5 mg and a scanning speed of 20 ° C./min using a differential scanning calorimeter DSC-2 type manufactured by Perkin Elma.

Tensile strength (kg / 2.5 cm width); JIS
It was measured by the method described in L-1096. Surface abrasion strength: Measured by the method described in JIS L-1076 (ICI type method).

Example 1 A spun bond having a basis weight of 20 g / m ² and a thickness of 0.25 mm, which is made of a polyethylene terephthalate polymer, has a single yarn fineness of 2.0 denier, and is composed of long fibers having a circular cross section. A nonwoven web was produced. On the spunbond nonwoven web obtained, white knitted wool with a defibration rate of 80% was prepared by using a cutting machine to cut the cutting waste of cotton knitted underwear.
Using a random webber from Spinbau 30
Laminated webs were prepared by depositing at g / m ² .

Then, the obtained laminated web was subjected to a high-pressure columnar water flow treatment to obtain a laminated nonwoven fabric. The conditions for the high-pressure columnar water flow treatment are as follows: a nozzle with a hole diameter of 0.15 mm is used and the pressure is 8
It was set to 0 kg / cm ² .

The obtained laminated nonwoven fabric has a basis weight of 50 g /
m ^2, a thickness of 0.33mm, the tensile strength is 7.5kg /
2.5 cm width, surface wear strength is grade 4, water absorption,
It was also excellent in flexibility and had a good feel to the touch.

Example 2 On the spunbonded non-woven web produced in Example 1, 40 g of basis weight of water-absorbent rayon short fiber fluff having a single yarn fineness of 3.0 denier was measured by a parallel array method using a conventional card machine. /
deposited at m ^2, and to produce a laminated web.

Then, the obtained laminated web was subjected to high-pressure columnar water flow treatment to obtain a laminated nonwoven fabric. The conditions for the high-pressure columnar water flow treatment are as follows: a nozzle with a hole diameter of 0.15 mm is used and the pressure is 8
It was set to 0 kg / cm ² .

The obtained laminated nonwoven fabric has a basis weight of 60 g /
m ² , thickness 0.41 mm, tensile strength 7.2 kg /
2.5 cm width, surface wear strength is grade 4, water absorption,
It was also excellent in flexibility and had a good feel to the touch.

Example 3 On the side of the spunbond nonwoven web of the laminated web produced in Example 1, again, in the same manner as in Example 1, the previously scoured and bleached cotton fiber fluff was deposited at a basis weight of 30 g / m ² . Let
A three-layer web was produced.

Then, in the same manner as in Example 1, the obtained three-layer web was subjected to high-pressure columnar water flow treatment to obtain a laminated nonwoven fabric. The conditions for the high-pressure columnar water flow treatment were a nozzle having a pore diameter of 0.15 mm and a pressure of 80 kg / cm ² .

The resulting laminated nonwoven fabric has a basis weight of 80 g /
m ² , thickness 0.50 mm, tensile strength 8.1 kg /
2.5 cm width, surface wear strength is grade 4, water absorption,
It was also excellent in flexibility and had a good feel to the touch.

Example 4 A polyethylene terephthalate polymer having a melting point of 250 ° C., a single yarn fineness of 2.0 denier, and a basis weight of 15 g / m ² and a thickness of 0. A 20 mm spunbond nonwoven web was produced. On the resulting spunbond nonwoven web, cotton fiber fluff previously scoured and bleached was deposited at a basis weight of 30 g / m ² using a cross webber by a cross array method to produce a laminated web.

Then, the obtained laminated web was subjected to a high-pressure columnar water stream treatment and then a heat-bonding treatment using a hot embossing roller to obtain a laminated nonwoven fabric. The conditions for high-pressure columnar water flow treatment were to use a nozzle with a hole diameter of 0.15 mm and a pressure of 80 k.
It was set to g / cm ² . The conditions for the heat-bonding treatment were a roller temperature of 200 ° C., a roller linear pressure of 15 kg / cm, and a pressure contact area ratio of 11%.

The resulting laminated nonwoven fabric has a basis weight of 48 g /
m ² , thickness 0.32 mm, tensile strength 11.0 kg /
2.5 cm width, surface wear strength is grade 4, water absorption,
It was also excellent in flexibility and had a good feel to the touch.

Example 5 The sheath component was composed of 50% by weight of a polyethylene polymer having a melting point of 130 ° C., the core component was composed of 50% by weight of a polyethylene terephthalate polymer having a melting point of 250 ° C., and the single yarn fineness was 2.5 denier and a circular cross section. A spunbond nonwoven web having a basis weight of 18 g / m ² and a thickness of 0.20 mm, which was composed of core-sheath type composite continuous fibers in a shape, was produced. On the obtained spunbond nonwoven web, the cotton fiber fluff previously scoured and bleached is weighed by a cross-web method using a cross webber to give a weight of 20 g / m ^2.
To produce a laminated web.

Then, the obtained laminated web was subjected to a high-pressure columnar water stream treatment, and then subjected to a heat-bonding treatment using a hot embossing roller to obtain a laminated nonwoven fabric. The conditions for high-pressure columnar water flow treatment were to use a nozzle with a hole diameter of 0.15 mm and a pressure of 80 k.
It was set to g / cm ² . The conditions for the heat-bonding treatment were a roller temperature of 140 ° C., a roller linear pressure of 15 kg / cm, and a pressure contact area ratio of 11%.

The resulting laminated nonwoven fabric has a basis weight of 40 g /
m ² , thickness 0.30 mm, tensile strength 10.5 kg /
2.5 cm width, surface wear strength is grade 4, water absorption,
It was also excellent in flexibility and had a good feel to the touch.

Example 6 On the spunbonded non-woven web produced in Example 5, water absorbent water-absorbent rayon staple fibers having a single yarn fineness of 3.0 denier were weighed in an amount of 30 g by a parallel array method using a conventional card machine. /
deposited at m ^2, and to produce a laminated web.

Next, the obtained laminated web was subjected to a high-pressure columnar water stream treatment, and then a heat-bonding treatment using a hot embossing roller to obtain a laminated nonwoven fabric. The conditions for high-pressure columnar water flow treatment were to use a nozzle with a hole diameter of 0.15 mm and a pressure of 80 k.
It was set to g / cm ² . The conditions for the heat-bonding treatment were a roller temperature of 140 ° C., a roller linear pressure of 15 kg / cm, and a pressure contact area ratio of 11%.

The obtained laminated nonwoven fabric has a basis weight of 52 g /
m ^2, a thickness of 0.35mm, the tensile strength is 10.2kg /
2.5 cm width, surface wear strength is grade 4, water absorption,
It was also excellent in flexibility and had a good feel to the touch.

Example 7 On the side of the spunbonded nonwoven web of the laminated web produced in Example 5, again, as in Example 5, the previously scoured and bleached cotton fiber fluff is deposited at a basis weight of 20 g / m ² . Let
A three-layer web was produced.

Then, in the same manner as in Example 5, the obtained three-layer web was subjected to a high-pressure columnar water flow treatment and a heat-bonding treatment to obtain a laminated nonwoven fabric. The condition for the high-pressure columnar water flow treatment is that the pore size is 0.
A 15 mm nozzle was used and the pressure was 80 kg / cm ² . Further, the condition of the heat-bonding treatment is that the roller temperature is 140
℃, roller linear pressure 15kg / cm, pressure contact area ratio 1
It was set to 1%.

The obtained laminated nonwoven fabric has a basis weight of 63 g /
m ² , thickness 0.40 mm, tensile strength 11.0 kg /
2.5 cm width, surface wear strength is grade 4, water absorption,
It was also excellent in flexibility and had a good feel to the touch.

[0051]

EFFECT OF THE INVENTION The laminated nonwoven fabric of the present invention has practically sufficient tensile strength and dimensional stability due to the thermoplastic synthetic filament itself and three-dimensional entanglement, and excellent water absorption and flexibility due to the fluff of the cellulose-based short fibers, and the texture. It has both feeling and surface abrasion resistance, and can be suitably used particularly as a material for a packaging material or a material for a cover material such as a disposable chair cover or table cloth. In addition to the three-dimensional entanglement, by partially thermally bonding the thermoplastic synthetic filaments to each other, it becomes possible to maintain high dimensional strength and good dimensional stability, and also has wiping properties. In this case, it can be suitably used as a material for printing wiping cloth, disposable underwear, and the like.
In addition, what laminated | stacked the web layer which consists of a cellulosic short-fiber fluff on both surfaces of the web layer which consists of thermoplastic synthetic filaments has the same external appearance and wearing feeling as pure cotton underwear.

According to the method for producing a laminated nonwoven fabric of the present invention, the laminated nonwoven fabric can be efficiently produced.

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Claims (5)

[Claims] 1. A web layer A comprising thermoplastic synthetic filaments.
Is laminated on at least one surface thereof with a cellulosic short fiber fluff, and the web layers A and B are laminated.
Is a single piece made by integrating three-dimensional entanglement between short fibers of cellulose-based fibers and thermoplastic synthetic long fibers. 2. A web layer A comprising thermoplastic synthetic filaments.
Of at least one side of the web layer B composed of short fibers of cellulose-based fibers are laminated, and the web layers A and B are integrated by three-dimensional entanglement between the short fibers of cellulose-based fibers and thermoplastic synthetic long fibers. And the thermoplastic synthetic filaments are partially heat-bonded to each other. 3. A core-sheath composite long fiber in which a thermoplastic synthetic filament has a sheath component made of a polyolefin-based polymer and a core component made of a thermoplastic synthetic polymer having a melting point at least 30 ° C. higher than the melting point of the polyolefin-based polymer. The laminated nonwoven fabric according to claim 2, which is a fiber. 4. A web layer A composed of thermoplastic synthetic filaments.
By laminating a web layer B made of short fibers of cellulosic short fibers on at least one side of and then injecting a high-pressure liquid columnar flow to three-dimensionally entangle the short fibers of cellulosic short fibers with thermoplastic synthetic long fibers. A method for producing a laminated nonwoven fabric, characterized in that the web layer A and the web layer B are integrated. 5. A web layer A made of thermoplastic synthetic filaments.
By laminating a web layer B made of short fibers of cellulosic short fibers on at least one side of and then injecting a high-pressure liquid columnar flow to three-dimensionally entangle the short fibers of cellulosic short fibers with thermoplastic synthetic long fibers. After the web layer A and the web layer B are integrated, the thermoplastic synthetic filaments are partially heat-bonded to each other, thereby producing a laminated nonwoven fabric.