JP2003231196A - Discriminated sheet and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discriminated sheet having novel performance and a novel surface appearance. <P>SOLUTION: Multi-filament yarns of a thermoplastic polymer are deposited at random on a thermoplastic polymer sheet, and the sheet and the yarns are integrated by heat-adhesion. The yarns are preferably deposited by a spun-bond method. The yarns are twisted. Alternatively, the filaments constituting the yarn are preferably fusion-bonded to each other by melting or softening part of the surface of the thermoplastic polymer of the filaments to be converged. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a differentiating sheet.

[0002]

2. Description of the Related Art Conventionally, a nonwoven fabric obtained by a spun bond method, that is, a thermoplastic polymer is melted, and a spun yarn group is taken by a high-speed air stream, drawn, opened, and captured on a net conveyor. Collect and deposit to form a non-woven web,
It is well known that a non-woven fabric composed of long fibers in which fibers are integrated by thermal bonding or the like has higher productivity than dry non-woven fabric or wet non-woven fabric and has excellent mechanical properties such as tensile strength. .

The spunbonded nonwoven fabric is preferably used in various fields such as industrial and industrial materials such as construction, civil engineering and vehicles, medical materials, sanitary materials, daily life materials, agriculture, gardening and forestry materials. In addition, they are used for various applications in these fields, and as the applications are expanded, the required performances required for spunbonded nonwoven fabrics are also diversified. In recent years, such a wide range of applications and fine performance requirements have been demanded, and differentiated products that can be used specifically for specific applications have been desired.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a differentiating sheet having performance and surface appearance that have never been seen in the past under the above circumstances.

[0005]

Means for Solving the Problems The present inventor has made diligent studies in view of the above situation, and as a result, in the spunbond method, after introducing the melt-spun yarn into an air sucker and drawing and stretching at high speed. It was common knowledge that individual monofilaments should be spread apart and piled up using an opener, but this common sense was broken, and individual monofilaments were not intentionally separated by an opener and intentionally multi-plied. The present invention has been accomplished by finding that a sheet having a performance and surface appearance that cannot be obtained in the past can be obtained by forming a filament yarn.

That is, according to the present invention, a multifilament yarn made of a thermoplastic polymer is deposited in a random direction on a sheet made of a thermoplastic polymer, and the sheet and the multifilament yarn are integrated by thermal bonding. The main point is a differentiation sheet that is characterized by

In the present invention, a thermoplastic polymer is melt-spun, and a spun yarn is introduced into air sucker and pulled / stretched. The multifilament yarn is discharged and deposited on a sheet made of a thermoplastic polymer placed on the movable collection surface, and then the sheet and the multifilament yarn are heat-bonded by heat treatment to be integrated as a whole. The gist is a method for producing a differentiating sheet, which is characterized in that

In the present invention, a thermoplastic polymer is melt-spun, and a spun yarn is introduced into air sucker and towed / stretched. The multifilament yarn is discharged and deposited on the movable collecting surface to form a web made of the multifilament yarn, while the monofilament made of the opened thermoplastic polymer is made into a web made of the multifilament yarn. A web of multifilament yarns and a web of monofilaments are stacked on top of each other to obtain a laminate, and then the web of multifilament yarns and the webs of monofilaments are heat-bonded by heat treatment to form an integral body as a whole. It is a gist of the manufacturing method of the differentiating sheet characterized by making it different.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the differentiated sheet of the present invention, a multifilament yarn made of a thermoplastic polymer is deposited in random directions on a sheet made of a thermoplastic polymer.
The multifilament yarns are preferably spunbonded and deposited in random directions.

The multifilament yarn according to the present invention is
The plurality of single fibers constituting the multifilament yarn are bundled so as not to be separated, but the multifilament yarn may be bundled by having a twist, and the single filaments constituting the multifilament yarn may be formed. The fibers may be fused by melting or softening a part of the surface of the thermoplastic polymer forming the single fibers, so that the single fibers forming the multifilament yarn may be converged. . Furthermore, in the twisted state of the multifilament yarn, the single fibers are fused by melting or softening a part of the surface of the thermoplastic polymer constituting the single fibers. May be.

When the multifilament yarn has a twist, the number of twists is 1 T / 10 cm or more, preferably 5
It may be T / 10 cm or more. Number of twists is 1T / 10c
When it is less than m, a plurality of single fibers are not converged but are scattered and easily dispersed, which is not the object of the present invention. The upper limit of the number of twists is not particularly limited.

In the case where the multifilament yarn is obtained by fusing the monofilaments together, the degree of the fusion is such that they do not easily come apart, and the individual monofilaments have a fiber form. Even if it ’s well maintained,
Further, not only a part of the surface of the thermoplastic polymer constituting the single fiber, but also melted or softened to the inside, so that the boundary surface between the single fibers is not so clear that it is firmly fused. You may

The sheet made of the thermoplastic polymer in the present invention is not particularly limited as long as it is made of the thermoplastic polymer, and spunbonded nonwoven fabric, flash spun nonwoven fabric,
Melt blown non-woven fabric, synthetic short fiber non-woven fabric, synthetic paper, film and the like can be mentioned. In the present invention, a spunbonded nonwoven fabric is preferred from the viewpoint of mechanical strength and productivity.

The multifilament yarn and sheet in the present invention are made of a thermoplastic polymer. As the thermoplastic polymer, generally used thermoplastic polymers may be used, polyester-based polymer,
A biodegradable polyester polymer, polyamide polymer, polyolefin polymer or the like can be preferably used. Further, it may be a copolymer, for example, when using a polyester-based copolymer, alkylene terephthalate as a main component, acid components such as isophthalic acid and adipic acid, tetramethylene glycol, neopentyl glycol and the like. The thing which copolymerized the diol component is mentioned.

Further, to these polymers, various additives such as matting agents, pigments, flameproofing agents, light stabilizers, heat stabilizers, antioxidants, flame retardants, etc. may be added to these polymers depending on the use and the like. You may add. By appropriately selecting and adding a pigment or a fluorescent agent, the multifilament yarn has a pattern in which it is raised from the sheet, and a product excellent in aesthetics and design can be obtained.

Although the polymer constituting the multifilament yarn and the polymer constituting the sheet were the same,
Although different polymers may be used, it is preferable that they are the same polymer or the same kind of polymer in consideration of the integrity of the both due to heat adhesion.

The form of the single fiber constituting the multifilament yarn may be a single-phase form composed of one kind of polymer or a composite form composed of two or more kinds of polymers.

In the present invention, as the multifilament yarn, when the single fibers are fused together, or in consideration of the adhesiveness between the sheet and the multifilament yarn and the thermal adhesiveness between the multifilament yarns, The form of monofilament is
A core-sheath composite type in which a high melting point polymer is arranged in the core component and a low melting point polymer is arranged in the sheath component is preferable. When the form of the single fiber is the core-sheath composite type, the multifilament yarn in which the single fibers are fused to each other can be efficiently produced by the production method described later. Further, in the core component, the molecules are sufficiently oriented, so the strength of the fiber is high,
On the other hand, the sheath component is preferable because it can function as a binder for fusing the single fibers together, and can also function as a binder responsible for the adhesion between the sheet and the multifilament yarns and the adhesion between the multifilament yarns.

The cross-sectional shape of the single fiber is not particularly limited and can be appropriately selected from a general circular cross section, a flat cross section, a polygonal cross section, a hollow cross section having a hollow portion, and the like.

The total fineness of the multifilament yarn in the present invention is not particularly limited, and may be appropriately selected according to the required performance such as application. In the differentiated sheet of the present invention, it is preferably 15 decitex or more, and further preferably 30 decitex or more in order to exert a superior effect. By setting the total fineness of the multifilament yarn to 15 decitex or more, it is possible to visually feel the aesthetics, and the design is excellent.
It has excellent mechanical strength such as rigidity and tear strength. The upper limit of the total fineness of the multifilament yarn is not particularly limited,
It may be appropriately selected according to the purpose of use.

The monofilament fineness of the monofilaments constituting the multifilament yarn and the number of monofilaments constituting the multifilament yarn may be appropriately selected according to the total fineness of the multifilament yarn and the use of the differentiated sheet. It is not particularly limited. The single yarn fineness of the single fiber is about 5 to 15 decitex. When it is attempted to obtain a multifilament yarn by fusing single fibers together, it is difficult for the single fibers to converge and to be fused because the fibers are easily cooled in the spinning step when the number is less than 5 decitex. Become. On the other hand, if it exceeds 15 decitex, the fibers are difficult to cool, so that the fusion of the single fibers becomes excessive, and it is not realistic to obtain the intended multifilament yarn, because it is difficult to produce it with ordinary equipment.

The sheet made of the thermoplastic polymer in the present invention and the multifilament yarn are integrated by thermal bonding. Here, the thermal bonding means that the thermoplastic polymer constituting the multifilament yarn is bonded by being melted or softened by heat. In particular,
It may be heat-bonded by being partially thermocompression-bonded by hot embossing, may be heat-bonded by heat treatment by thermal calendaring, or may be heat-bonded by hot air treatment. . Also, a combination of these methods may be used. In the present invention, from the viewpoint of the integrity of the multifilament yarn and the sheet and the morphological stability of the layer composed of the multifilament yarn, those that are thermally bonded by applying heat and pressure, that is, heat embossing or It is preferable that the thermal calendering is performed.

In the present invention, the basis weight of the layer composed of the multifilament yarn is not particularly limited and may be appropriately selected depending on the application and required performance. For example, if it is desired to emphasize the appearance of a multifilament yarn deposited in a random direction as a pattern raised on a sheet, it may be 250 g / m ² or less, depending on the total fineness of the multifilament yarn. preferable. Further, the total fineness of the multifilament yarn at this time is preferably 15 decitex or more. When used for applications requiring tear strength and rigidity, the basis weight is preferably 15 g / m ² or more. In any case, it may be appropriately selected depending on the application, cost and the like.

As described above, the differentiated sheet of the present invention is one in which multifilament yarns are deposited in random directions on the sheet, and the sheet and the multifilament yarns are integrated by thermal bonding. It is also possible to combine this differentiating sheet with other materials. That is,
Other ordinary spunbonded non-woven fabric, short fiber non-woven fabric, melt blown non-woven fabric, paper, woven / knitted fabric, film and the like may be bonded to the multifilament yarn side or the sheet side made of a thermoplastic polymer to form a composite.

Next, a preferred method for producing the differentiated sheet of the present invention will be described.

First, a laminate having multifilament yarns deposited in random directions on (or under) a sheet made of a thermoplastic polymer is obtained. The following two modes are mentioned as a method of obtaining such a laminated body. The multifilament yarn deposited (hereinafter, also referred to as a multifilament yarn web) may be randomly deposited by a spunbond method on (or below) a sheet made of a thermoplastic polymer. It is preferable from the viewpoint of sex.

The thermoplastic polymer is melt-spun and the spun yarn (a plurality of single fiber groups) is introduced into an air sucker to pull it.
The multifilament yarn in the stretched state in which a plurality of single fibers are converged is discharged from the air sucker, and the multifilament yarn is deposited on the sheet made of the thermoplastic polymer placed on the movable collecting surface. Thereby, a laminated body can be obtained (Aspect 1).

Further, the thermoplastic polymer is melt-spun, the spun yarn (a group of a plurality of single fibers) is introduced into an air sucker, towed and drawn, and a multifilament in which a plurality of single fibers are converged The yarn can be discharged from the air sucker, the multifilament yarn can be deposited on the movable collecting surface, and a sheet made of a thermoplastic polymer can be laminated thereon to obtain a laminate. (Aspect 2) In order to discharge the multi-filament yarn in a state in which a plurality of spun single fibers are converged from the air sucker, it is preferable to twist it in the air sucker. As a method of applying twist in the air sucker, it is preferable to make the flow of the pulling air in the air sucker a spiral flow. Specifically, there is a method of making a swirl flow by attaching a blade to the entrance or the inside of the air sucker and moving the blade, and a method of blowing air to the entrance or the inside of the air sucker to make a swirl flow. Can be mentioned.

Further, it is preferable to fuse a plurality of single fibers to each other before or into the air sucker to form a multifilament yarn. Specifically, in the spun yarn that is melt-spun from the spinneret, when individual single fibers are not completely cooled (single fibers can be fused), a plurality of A method may be mentioned in which single fibers are adhered to each other to be fused and then introduced into an air sucker. In addition, the air sucker inlet is designed to be small so that the individual single fibers are not completely cooled (the single fibers can be fused together) and introduced into the air sucker. In addition, there is a method in which single fibers are closely adhered to each other and fused. In order to discharge the multifilament yarn in which the single fibers are fused to each other from the air sucker, it is necessary that the single fibers are in a state in which they can be fused. The distance to the (position of the guide or the inlet of the air sucker), the pulling speed, etc. are appropriately set depending on the thermoplastic polymer to be used, the single hole projection amount, and the like. Further, when the single fibers are fused together, the fusion state of the single fibers (fusion that does not easily come apart, strong fusion, etc.) is determined by the state of the thermoplastic polymer that constitutes the single fibers. can do.

Next, the multifilament yarn discharged from the air sucker is deposited to form a web made of the multifilament yarn. At this time, in the case of the first aspect, a sheet made of a thermoplastic polymer is placed on the movable collection surface, and the multifilament yarn is deposited on the sheet. On the other hand, in the case of the second aspect, the multifilament yarn is deposited on the movable collecting surface.

When depositing the multifilament yarn, it is preferable to shake the multifilament yarn in the width direction by blowing air or the like onto the multifilament yarn immediately after discharged from the air sucker. As air is blown alternately from the left and right, the multifilament yarn draws a gentle spiral and can be deposited in a loop on the sheet or on the movable collection surface, so a random loop It is preferable that it can be deposited on

In the case of the second aspect, a sheet made of a thermoplastic polymer is deposited on a web made of multifilament yarn deposited on the movable collection surface.

The use of a spunbond web as the thermoplastic polymer sheet is preferable because of its good productivity in obtaining the laminate of the present invention. That is, it is a method of performing two-step deposition by the spunbond method.

The method of performing the two-stage deposition by the spunbond method means that, by the spunbond method, the fibers are melt-spun, drawn and drawn by air-sucker, and then opened so that the single fibers are separated. A single fiber made of a thermoplastic polymer is deposited on the movable collecting surface, and a multifilament yarn is deposited on the movable collecting surface to obtain a laminated body (Aspect 1 '). A web consisting of multifilament yarns is formed by depositing on the surface, and then a spunbond method is used to melt-spin and draw / stretch with air-sucker, so that the single fibers are separated. This is to deposit monofilaments made of the opened thermoplastic polymer to obtain a laminate (Aspect 2 ′).

Next, the obtained laminate is heat-treated to heat-bond the web made of the multifilament yarn and the sheet made of the thermoplastic polymer to be integrated as a whole to obtain the differentiated sheet of the present invention. .

As the heat treatment, hot embossing using an embossing device consisting of a pair of embossing rolls or an embossing device consisting of an embossing roll and a flat roll, thermal calendering using a calendering device consisting of a pair of flat rolls, hot air dryer, etc. A hot air treatment in which heat treatment is performed through the resin is included, and it is preferable to perform hot embossing or thermal calendering from the viewpoint of morphological stability.

Regarding the heat embossing, the individual size of the partial thermocompression bonding parts of the obtained differentiation sheet, the disposition density of the partial thermocompression bonding parts, and the pressure contact area depend on the area of the convex parts of the embossing roll and the disposition density. The rate is determined. The area of the convex portions of the embossing roll and the pressure contact area ratio (ratio of the area of the total convex portions to the total surface area of the roll) are easily separated from the sheet in which the multifilament yarn is made of the thermoplastic polymer in the obtained differentiated sheet. It is not particularly limited as long as it does not peel off and can maintain the shape as a differentiated sheet, but the area of the convex portion is about 0.1 to ⁵ mm ² , and the pressure contact area ratio is 1
It may be about 0 to 60%, and may be appropriately selected depending on the application and required performance. In the differentiated sheet of the present invention, in the case where the total fineness of the multifilament yarn is 15 decitex or more, for example, in the case of a low basis weight of 5 g / m ² or less, the multifilament yarn occupies a unit area. Since the number of multifilament yarns is small, the web made of multifilament yarn has a large number of large voids (openings) when viewed two-dimensionally (planarly). Therefore, in consideration of shape retention, it is preferable that the area of the convex portion is large and the press contact area ratio is large. When using an embossing device composed of an embossing roll and a flat roll, it is preferable to perform heat treatment so that the flat roll side is in contact with the web side made of multifilament yarn. It is also preferable to perform heat treatment with a calendar device.

[0038]

EXAMPLES The present invention will now be described in detail with reference to examples, but the present invention is not limited to these examples. In addition, each characteristic value in the examples was obtained as follows.

(1) Intrinsic viscosity of polyester [η];
Equal mass ratio mixed solvent of phenol and ethane tetrachloride 10
A 0.5 g sample was dissolved in 0 cc and measured.

(2) Melting point (° C.); using a differential scanning calorimeter DSC-7 type manufactured by Perkin Elmer Co., Ltd., a heating rate of 20
It was measured at ° C / min.

Example 1 Using a chip made of polyethylene terephthalate (melting point of 260 ° C., intrinsic viscosity of 0.70) as a raw material and using a known melt spinning apparatus, a spinneret with 200 holes having a round cross section was used. Melt spinning was performed at a spinning temperature of 280 ° C. The distance between the spinneret and air sucker was set to 120 cm, and the spun yarn was introduced into the air sucker. Then, in air sucker, the filament is drawn, stretched and thinned at a pulling speed of 5000 m / min so that the fineness of the single fiber becomes 3.3 decitex, discharged from the air sucker to open the yarn group, and then moved. Was collected and deposited on the collecting surface to obtain a web (unit weight: 45 g / m ² ) composed of continuous single fibers.

Then, multifilament yarns were deposited in random directions on the web made of the single fibers. That is, polyethylene terephthalate containing 0.6% by mass of a red pigment (melting point 260 ° C., intrinsic viscosity 0.70)
Using the above-mentioned chips as a raw material, a known melt-spinning apparatus was used to perform melt-spinning at a spinning temperature of 280 ° C. from a spinneret having 28 holes with a round cross section. The distance between the spinneret and air sucker was set to 100 cm, and the spun yarn was introduced into an air sucker with a stationary blade attached to the inlet. At this time, 14 single fibers were introduced into one air soccer. Then, in air soccer, pulling speed 3 so that the fineness of the single fiber becomes 10 decitex.
At the same time as it was pulled at 200 m / min, the monofilaments were converged by twisting in the air sucker, and a multifilament yarn having a total fineness of 140 decitex in which 14 monofilaments were converged by twisting was discharged from the air sucker.

The multifilament yarn discharged from the air sucker is swung by the air blower from the left and right,
While being spirally rotated, it is collected and deposited on a web made of continuous single fibers on the collecting surface (the weight of the web made of multifilament yarn is set to 15 g / m ² ), and the laminate is obtained. Obtained.

Next, the laminated body was introduced into a hot embossing device consisting of an embossing roll (the area of the embossing convex portion was 0.9 mm ² and the area ratio was 21%) and the surface temperature of both rolls was 230 ° C. and the linear pressure was 294 N. / Cm, a web made of multifilament yarn was passed through so as to contact the flat roll, and was partially subjected to heat-pressing treatment to obtain a differentiated sheet having a basis weight of 60 g / m ² .

Example 2 Using a chip made of polyethylene terephthalate (melting point 260 ° C., intrinsic viscosity 0.70) as a raw material, a known melt spinning apparatus was used, and a spinning spinneret with 28 holes having a round cross section was used. Melt spinning was performed at a spinning temperature of 280 ° C. The distance between the spinneret and air soccer is set to 60 cm,
The spun yarn was introduced into an air sucker having a small air sucker inlet (diameter: 5 mm). At this time, 14 single fibers were introduced into one air soccer. And, in air soccer, the fineness of single fiber is 12
A multifilament yarn with a total fineness of 168 decitex, which was drawn at a drawing speed of 4000 m / min so that it became a decitex, and at the same time, the single fibers were brought into close contact with each other and fused in an air sucker, and 14 monofilaments were converged by the fusion. Was discharged from the air soccer.

The multifilament yarn discharged from the air sucker is swung by the air blower from the left and right,
While rotating spirally, it was collected and deposited on the movable collection surface.

Next, continuous monofilaments were deposited on the web of the obtained multifilament yarn. That is, using a chip made of polyethylene terephthalate (melting point 260 ° C., intrinsic viscosity 0.70) containing 0.1% by mass of a fluorescent material as a raw material, and using a known melt spinning device, the number of holes where the fiber cross section is round From the 200-hole spinneret,
Melt spinning was performed at a spinning temperature of 280 ° C. The distance between the spinneret and air sucker was set to 140 cm, and the spun yarn was introduced into the air sucker. Then, in air sucker, the filament is drawn, stretched and thinned at a pulling speed of 5000 m / min so that the fineness of the single fiber becomes 3.3 decitex, discharged from the air sucker to open the yarn group, and then moved. It is collected and deposited on a web made of multifilament yarn on the collecting surface, and a laminated body (weight of web made of multifilament yarn of 17.3 g / m ² , weight of web made of monofilament 42.7 g / m ^{2 2} ) got

Next, the laminated body was introduced into a hot embossing device consisting of an embossing roll (the area of the embossing convex portion was 0.9 mm ² , and the area ratio was 21%) and the surface temperature of both rolls was 230 ° C. and the linear pressure was 294 N. / Cm, a web made of multifilament yarn was passed through so as to contact the flat roll, and was partially subjected to heat-pressing treatment to obtain a differentiated sheet having a basis weight of 60 g / m ² .

Example 3 A web made of multifilament yarn was obtained as described below, and the heat treatment was carried out in the same manner as in Example 2 except that the treatment temperature was 215 ° C. for the flat roll and 230 ° C. for the embossing roll. The differentiation sheet was obtained in the same manner.

Polyethylene terephthalate (melting point 260
Copolymerized polyester (melting point 235) having ethylene terephthalate as a repeating unit and 8 mol% of isophthalic acid as a repeating unit.
C.) as a raw material, and using a known core-sheath type composite melt spinning apparatus, polyethylene terephthalate is sheathed in the core portion from a composite spinneret having 28 holes with a fiber cross section of a core-sheath type. So that the copolymerized polyester is placed in each part, and the spinning temperature is 2 at a mass ratio (1/1).
It was melt spun at 80 ° C. The distance between the spinneret and air sucker was set to 60 cm, and the spun yarn was introduced into an air sucker having a small air sucker inlet (diameter 5 mm). At this time, 14 single fibers were introduced into one air soccer. Then, in the air sucker, the single fibers were pulled at a pulling speed of 4000 m / min so that the fineness of the single fibers was 10 decitex, and at the same time, the single fibers were closely adhered and fused in the air sucker, and the 14 single fibers were fused. The multifilament yarn having a total fineness of 140 decitex which was converged by the wearing was discharged from the air sucker.

The multi-filament yarn discharged from the air sucker is swung by the air blower from the left and right,
While rotating spirally, it was collected and deposited on a web composed of continuous filaments on the collecting surface to obtain a laminate.

The differentiated sheets of Examples 1 to 3 are those in which multifilament yarns are randomly deposited on the sheet and have an embossed pattern, which is aesthetically excellent.
In particular, Examples 1 and 2 in which a fluorescent agent and a pigment were added to the constituent polymer of the multifilament yarn had particularly excellent aesthetics.

[0053]

According to the present invention, multifilament yarns are deposited in random directions on a sheet made of a thermoplastic polymer, and the sheet and the multifilament yarns are integrated by thermal bonding. Since the total fineness of the multifilament yarn can be determined by appropriately selecting the fineness and the number of constituent fibers of the multifilament yarn, the spunbonded non-woven fabric in which the conventional single fibers are deposited in pieces It is possible to expect a wide variety of performance requirements that could not be met. For example, since the total fineness of the multifilament yarn can be appropriately selected, it is possible to make the total fineness extremely large, and it is possible to impart excellent rigidity to the differentiated sheet. Further, since it is composed of a multifilament yarn which is an aggregate of a plurality of single fibers, it is also particularly excellent in tear strength.

Furthermore, by adding a pigment, a fluorescent agent or the like to the multifilament yarn to reduce the basis weight of the web made of the multifilament yarn, a multifilament yarn deposited on a sheet made of a thermoplastic polymer is obtained. ,
It looks like an embossed pattern on the seat, has an aesthetically pleasing appearance, and has excellent design characteristics, and can be expected to be used as wallpaper or interior goods for interior.

In the differentiated sheet of the present invention, the fineness of the single fibers constituting the multifilament yarn, the number of constituent fibers, and the total fineness of the multifilament yarn can be appropriately selected in a wide range, and can also be appropriately selected together with the basis weight. By
By appropriately selecting the material of the sheet made of a thermoplastic polymer, it can be expected to meet various required performances according to various uses, and industrial / industrial materials such as construction, civil engineering, and vehicles, and medical materials. It can be preferably used for various purposes in various fields such as sanitary materials, daily life materials, and agricultural / horticultural / forestry materials.

Claims (12)

[Claims] 1. A multifilament yarn made of a thermoplastic polymer is randomly deposited on a sheet made of a thermoplastic polymer, and the sheet and the multifilament yarn are integrated by thermal bonding. A differentiating sheet that features. 2. The differentiated sheet according to claim 1, wherein the multifilament yarn made of a thermoplastic polymer is deposited by a spunbond method. 3. The differentiated sheet according to claim 1 or 2, wherein the sheet made of a thermoplastic polymer is a spunbonded nonwoven fabric. 4. The differentiating sheet according to claim 1, wherein the multifilament yarn has a twist. 5. The multifilament yarn is such that the single fibers constituting the multifilament yarn are fused by melting or softening part of the surface of the thermoplastic polymer constituting the single fiber. The differentiation sheet according to any one of claims 1 to 4. 6. The differentiated sheet according to claim 1, wherein the multifilament yarn has a total fineness of 15 decitex or more. 7. The monofilament constituting the multifilament yarn is a core-sheath type composite fiber in which a high melting point polymer is arranged in a core component and a low melting point polymer is arranged in a sheath component. The differentiation sheet according to any one of claims 1 to 6. 8. A thermoplastic polymer is melt-spun, a spun yarn is introduced into an air sucker, towed and drawn, and a multifilament yarn in which single fibers are bundled is discharged from the air sucker and moved. The multifilament yarn is deposited on a sheet made of a thermoplastic polymer placed on the collecting surface, and then the sheet and the multifilament yarn are heat-bonded by heat treatment to be integrated as a whole. Differentiating sheet manufacturing method. 9. The method for producing a differentiated sheet according to claim 8, wherein the sheet made of a thermoplastic polymer is a spunbond nonwoven fabric or a spunbond web. 10. A thermoplastic polymer is melt-spun, a spun yarn is introduced into an air sucker, towed and drawn, and a multifilament yarn in a state in which single fibers are bundled is discharged from the air sucker. A multifilament yarn is deposited on the movable collecting surface to form a web made of the multifilament yarn, while monofilaments made of the opened thermoplastic polymer are deposited on the web made of the multifilament yarn. To obtain a laminate of a web made of multifilament yarns and a web made of monofilaments, and then heat-bonding the web made of multifilament yarns and the web made of monofilaments to be integrated as a whole. A method for manufacturing a differentiating sheet which is a feature. 11. The multifilament yarn according to claim 8, which is a multifilament yarn in which single fibers are converged by being twisted in an air sucker. A method for manufacturing a spunbond nonwoven fabric. 12. The multifilament yarn according to any one of claims 8 to 11, wherein single fibers are fused to each other before being introduced into the air sucker or in the air sucker to form a multifilament yarn. For producing a spunbond nonwoven fabric.