JPH10131021A - Composite nonwoven fabric and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a composite nonwoven fabric that has high ply separation strength and excellent flexibility, filter performance and water absorptivity, and is useful as a medical and hygienic material by laminating specific long-fiber webs with specific short-fiber webs to be three-dimensionally integrated into a confounding condition. SOLUTION: This composite nonwoven fabric is produced by fusion-spinning a separate-type two-component composite continuous-yarn aggregate composed of a fiber-forming polymer of lower melting point and a fiber-forming polymer of higher melting point which is incompatible with the polymer of low melting point and has a melting point of 30-180 deg.C higher than that of the polymer of low melting point, taking up the spun yarns with an air sucker, accumulating the yarns on a traveling collector surface in opening condition to form webs, heat-compressing partly the composite single yarn aggregates of the webs to obtain a long-fiber web, laminating a short-fiber web composed of short fibers, such as cotton, wool and rayon, on the long-fiber web, then treating the web laminate with a high-pressure fluid, thereby integrating the long-fiber webs mutually, the long-fiber web with the short-fiber web, and the short-fiber webs mutually three-dimensionally in confounding condition, thus forming the objective composite nonwoven fabric.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a laminate of a nonwoven fabric layer composed of ultrafine split filaments composed of two types of fiber-forming polymers and a nonwoven fabric layer mainly composed of natural fibers and / or regenerated fibers. A composite nonwoven fabric that is integrated, has high delamination strength, excellent flexibility, and has excellent filter performance and water absorption.
The present invention relates to a composite nonwoven fabric applicable to a wide range of uses including sanitary materials, clothing, living-related materials, industrial materials, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, various composite nonwoven fabrics in which short fiber webs are laminated on a base fabric have been disclosed. For example, JP-A-53-114975 and JP-A-53-12460
No. 1 discloses a composite nonwoven fabric in which a woven or knitted fabric is used as a base fabric and a nonwoven web made of split type bicomponent conjugate short fibers or an ultrafine fiber web obtained by a melt blown method is laminated thereon. However, the use of these composite nonwoven fabrics is limited to synthetic leather, and is extremely cost-effective and economically inferior. Further, JP-A-63-21354 discloses that a long fiber nonwoven fabric obtained by a spunbond method is used as a base fabric, and a long fiber present on one side or both sides is partially cut to form a fiber end. A composite nonwoven fabric is disclosed in which an end and a fiber obtained by laminating a short fiber web on a base fabric are entangled. However, this composite nonwoven fabric has a problem that the mechanical properties are deteriorated because the long fibers are partially cut, and the surface smoothness peculiar to the long fiber nonwoven fabric is impaired. Japanese Patent Publication No. 54-24506 discloses that a gas-permeable heat-sealing layer made of a thermoplastic fiber non-woven fabric and a gas-permeable non-heat-welding layer made of natural fibers and the like are laminated, and a heat-welding material is formed on the non-heat-welding layer. Are disposed intermittently, and a fused portion of the heat-welding substance and the heat-welding layer penetrates from both sides of the non-heat-welding layer, and has a structure in which the non-heat-welding layer is adhered and sandwiched. Has been proposed. However, although this laminated nonwoven structure has excellent water absorbability because natural fibers are laminated, it does not have a filter performance as is apparent from the purpose of improving the air permeability. In addition, the laminated nonwoven structure is manufactured by laminating a gas-permeable heat-sealing layer and a gas-permeable non-heat-welding layer when manufacturing the same, and polymerizing a heat-sealing sheet layer for impregnation on the non-heat-sealing layer. A step in which a fused portion of the heat-weldable substance and the heat-weldable layer penetrates from both surfaces of the non-heat-weldable layer by ultrasonic welding to develop a structure in which the non-heat-welded layer is adhered and sandwiched; From the viewpoint of the production technology, it is complicated and economically inferior from the viewpoint of the production technique, for example, requiring a step of peeling off the weldable sheet while leaving the fused portion.

[0003]

Therefore, the present invention provides a
A composite nonwoven fabric comprising a nonwoven fabric layer composed of an ultrafine split filament group composed of various types of fiber-forming polymers and a nonwoven fabric layer mainly composed of natural fibers and / or regenerated fibers. High delamination strength,
An object of the present invention is to provide a composite nonwoven fabric which is excellent in flexibility and has good filter characteristics and water absorption, and a method for efficiently producing the same.

[0004]

Means for Solving the Problems The present inventors have made intensive studies to achieve the above object, and as a result, have reached the present invention. That is, the present invention has the following configuration as its gist.

The fiber-forming low-melting polymer is incompatible with the low-melting polymer and has a melting point lower than the melting point of the low-melting polymer by 3%.
An ultrafine splitting fiber composed of the low-melting polymer and the high-melting polymer developed by dividing a split type two-component composite continuous single yarn comprising a fiber-forming high-melting polymer having a high melting point of 0 to 180 ° C. A long fiber web consisting of a group of filaments,
A short fiber web mainly composed of natural fibers and / or regenerated fibers is laminated, and the constituent fibers of the long fiber web, the constituent fibers of the long fiber web and the short fiber web, and the constituent fibers of the short fiber web are tertiary. A composite nonwoven fabric characterized by being integrated by original confounding.

The fiber-forming low-melting polymer is incompatible with the low-melting polymer and has a melting point lower than the melting point of the low-melting polymer by 3%.
A split type two-component composite continuous single yarn group consisting of a fiber-forming high melting point polymer having a high melting point of 0 to 180 ° C. is melt-spun, and the composite continuous single yarn group is taken up using an air sucker. Spreading and depositing on a movable collecting surface such as a conveyor to form a web, and performing a partial thermocompression treatment on the composite continuous single yarn group of the web using a partial thermocompression device,
The composite continuous single yarn group is partially thermocompression-bonded to obtain a long fiber web, and a short fiber web mainly composed of natural fibers and / or regenerated fibers is laminated on at least one surface of the long fiber web. Is subjected to high-pressure liquid flow treatment, and the constituent fibers of the long fiber web and the constituent fibers of the long fiber web and the short fiber web and the constituent fibers of the short fiber web are three-dimensionally entangled and integrated. A method for producing a composite nonwoven fabric.

In the method for producing a composite nonwoven fabric, as the long fiber web for laminating the short fiber webs, the long continuous fiber web which is partially thermocompression-bonded is present at the portion which is not thermocompression-bonded by buckling treatment. By splitting the yarn, at least a part of the ultrafine splitting filament group composed of a low-melting polymer or a high melting polymer is expressed, and the ultrafine splitting filament group uses a long fiber web in an unentangled state. A method for producing a composite nonwoven fabric, comprising:

In the method for producing a composite nonwoven fabric, as the long fiber web for laminating the short fiber web, a high-pressure liquid flow is applied to the partially thermocompressed long fiber web to thereby form a long fiber web which is not thermocompressed. By splitting the composite continuous single yarn, at least partially expressing a group of ultrafine split filaments composed of a low-melting polymer or a high-melting polymer, and three-dimensionally entangled the ultrafine split filament groups. A method for producing a composite nonwoven fabric, comprising using a fiber web.

[0009]

Next, the present invention will be described in detail.
First, a long fiber web composed of a split type two-component composite continuous single yarn used in the present invention will be described. The split type two-component composite continuous single yarn, a fiber-forming low-melting polymer,
A fiber-forming high-melting polymer that is incompatible with the low-melting polymer. The reason that the low-melting polymer and the high-melting polymer are incompatible with each other is that the single yarn is easily split when subjected to impact.

The melting point of the fiber-forming high melting point polymer of the split type two-component composite continuous single yarn must be 30 to 180 ° C. higher than the melting point of the fiber-forming low melting point polymer. If the difference in melting point between the two is less than 30 ° C, not only the low-melting polymer but also the high-melting polymer will be softened and melted during thermocompression bonding using a partial thermocompression bonding apparatus, and the composite nonwoven fabric having flexibility Is not obtained, and in the subsequent split splitting step, both components are hardly split and split, and a target composite nonwoven fabric cannot be obtained. Conversely, if the difference in melting point exceeds 180 ° C., the low-melting-point polymer tends to undergo thermal deterioration when melt-spinning both polymers, which makes it difficult to produce a composite continuous single yarn, which is not preferable.

As a specific example of the split type two-component composite continuous single yarn, one having a cross section as shown in FIGS. 1 to 4 is preferable. In these, both components of the fiber-forming low-melting polymer and the fiber-forming high-melting polymer are both exposed on the surface of the fiber, and within the cross section of the fiber, one component is split by the other component. It is divided into possible forms.

The fineness of the split type two-component composite continuous single yarn is preferably 1 to 12 denier. When the single-fiber fineness is less than 1 denier, the discharge amount per single hole of the spinneret during melt spinning decreases, and the production amount tends to decrease. Increasing the number of holes makes the spinning process unstable. on the other hand,
If the single yarn fineness exceeds 12 denier, it tends to be difficult to cool the melt-spun yarn or take it off by air soccer, and to reduce the number of holes in the spinneret to promote cooling of the yarn. , The production volume decreases.

The split type two-component composite continuous single yarn is split at the boundary between the low-melting polymer and the high-melting polymer by the split splitting process, and the split filament made of the low-melting polymer and the high-melting polymer. The split filament composed of a polymer is at least partially expressed. In the present invention, the single fiber fineness of the split filament that is expressed at least partially is preferably 0.8 denier or less, more preferably 0.05 to 0.8 denier, and still more preferably 0.1 to 0.5 denier. is there.
When the single yarn fineness is less than 0.05 denier, spinning is difficult in practice, and it is difficult to obtain a split type two-component composite continuous single yarn at low cost and rationally. In addition, there is a tendency that it is difficult to sufficiently perform split splitting. On the other hand, if it exceeds 0.8 denier, the obtained composite nonwoven fabric is inferior in flexibility and tends to have a rough and hard feeling, and the entanglement with the short fiber web is weakened, so that the delamination strength of the composite nonwoven fabric is increased. It tends to be inferior.

In the present invention, examples of the combination of the low-melting polymer and the high-melting polymer constituting the split type two-component composite continuous single yarn include polyolefin / polyamide, polyolefin / polyester, and polyamide / polyester. These are representative examples, and other various combinations may be arbitrarily adopted.

Examples of the fiber-forming polyolefin polymer which can be used in the present invention include aliphatic α-monoolefins having 2 to 16 carbon atoms, for example, ethylene, propylene, 1-butene, 1-pentene, 3 -Methyl 1-butene, 1-hexene, 1-octene, 1-dodecene, 1-
There is a homopolyolefin or a copolymerized polyolefin of octadecene. Aliphatic α-monoolefins may contain other olefins and / or small amounts (up to about 10% by weight of polymer weight)
Other ethylenically unsaturated monomers such as butadiene,
It may be copolymerized with similar ethylenically unsaturated monomers such as isoprene, pentadiene-1,3, styrene and α-methylstyrene. Especially in the case of polyethylene, up to about 10% by weight of the polymer weight of propylene, butene-
Those copolymerized with 1, hexene-1, octene-1 or a similar higher α-olefin are preferred because of improved spinning properties.

Examples of the fiber-forming polyamide polymer usable in the present invention include nylon-4 and nylon-4.
6, Nylon-6, Nylon-66, Nylon-61
0, nylon-11, nylon-12, polymetaxylene adipamide (MXD-6), polyparaxylenedecaneamide (PXD-12), polybiscyclohexylmethanedecaneamide (PCM-12) or a monomer of these There is a copolyamide as a unit. Examples of the fiber-forming polyester-based polymer that can be used in the present invention include, as an acid component, terephthalic acid, isophthalic acid, phthalic acid, aromatic dicarboxylic acids such as naphthalene-2.6 dicarboxylic acid or adipic acid, sebacic acid, etc. Aliphatic dicarboxylic acids or esters thereof, and alcohol components as ethylene glycol, diethylene glycol,
A homopolyester or a copolyester synthesized from a diol compound such as 1,4-butanediol, neopentylglycol, cyclohexane-1,4-dimethanol, etc., wherein paraoxybenzoic acid, 5-sodium sulfo Isophthalic acid, polyalkylene glycol, pentaerythritol, bisphenol A and the like may be added or copolymerized.

Examples of other fiber-forming polymers include:
For example, a vinyl polymer is used, and specifically, polyvinyl alcohol, polyvinyl acetate, polyacrylate, ethylene vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride, or a copolymer thereof is used. . Further, a polyphenylene-based polymer or a copolymer thereof can also be used.

The fiber-forming low-melting polymer and the fiber-forming high-melting polymer include matting agents, pigments, flame retardants, deodorants, antistatic agents as long as the object of the present invention is not impaired. Optional additives such as antioxidants, ultraviolet absorbers, and antibacterial agents may be added.

The long fiber web composed of the split type bicomponent composite continuous single yarn used in the present invention is generally produced by the following method. That is, spun by a conventionally known melt composite spinning method, using a conventionally known cooling device such as horizontal spraying or annular spraying, and cooled by spraying wind, and then generally using air soccer to reach a target fineness. As if towed and taken off. The towing speed is over 3000 m / min, especially 40
More than 00 m / min is more preferable because the dimensional stability of the nonwoven fabric is improved. The split-type two-component composite continuous single yarn discharged from air soccer generally consists of a screen after passing through a corona discharge area in a high-voltage field or through a frictional collision zone to be charged and spread. It is possible to obtain a long fiber web by spreading and accumulating on a moving deposition device such as a conveyor.

Next, the long fiber web is processed using a partial thermocompression bonding apparatus and partially thermocompression bonded. Partial thermocompression bonding means, for example, between a metal roll or embossing roll heated at a temperature equal to or lower than the melting point of the fiber-forming low-melting polymer and having an engraved pattern engraved on the surface, and a heated metal roll having a smooth surface. Means that the long fiber webs that are in contact with the engraved pattern are thermally pressed by using a so-called hot embossing roll or by using an ultrasonic fusing machine.

Each thermocompression bonding shape does not need to be circular, and any shape such as a rhombus, a triangle, and a T shape may be appropriately selected. The area of each thermocompression bonding part is 0.1 to 1.0 mm ²
In the range of 4 to 80 points /
cm ² is good. Further, the ratio of the area of the entire press contact area to the total surface area of the long fiber web, that is, the press contact area ratio is preferably 5 to 30%, and more preferably 5 to 20%. If the pressed area ratio is less than 5%, the mechanical properties and dimensional stability of the composite nonwoven fabric tend to be poor. 30% conversely
When it exceeds, when laminating short fiber webs and performing entanglement treatment by liquid flow treatment, the delamination strength of both web layers tends to decrease due to a decrease in entangled portions.

The thermocompression bonding temperature (embossing roll temperature) in the thermocompression bonding treatment is lower than the melting point of the fiber-forming low-melting polymer, preferably 5 to the melting point of the fiber-forming low-melting polymer.
-30 ° C lower temperature. For example, if the processing is performed at a temperature higher than the melting point, the long fiber web sticks to the thermocompression bonding apparatus and the operability is remarkably deteriorated. When the thermocompression bonding temperature is a temperature close to the melting point of the fiber-forming low-melting polymer, thermocompression bonding becomes strong, so that the dimensional stability of the long fiber web is excellent, and in the subsequent high-pressure liquid flow treatment, At the time of split splitting and entanglement integration of the composite continuous single yarn, the partial thermocompression bonding portion remains, and the split filament groups existing in the non-thermocompression bonding portion are three-dimensionally entangled. Therefore, the obtained composite nonwoven fabric is
High lateral elongation at break, excellent dimensional stability, and high mechanical strength. On the other hand, if the thermocompression bonding temperature is a temperature far from the melting point of the fiber-forming low-melting polymer, the partial thermocompression bonding section will be in a state of temporary thermocompression bonding in which the fiber form is left. During split splitting and entanglement integration of single yarn, the partial thermocompression bonding part is peeled off and becomes fibrous, and the composite continuous single yarn group and split filament group can move freely, and more randomly three-dimensionally. Confoundingly. Therefore,
The resulting composite nonwoven fabric has excellent flexibility and high delamination strength.

The basis weight of the long fiber web is preferably about 100 g / m ² or less. If the basis weight exceeds 100 g / m ² , in the subsequent split splitting treatment, the split type two-component composite continuous single yarn tends to not be split sufficiently throughout the entire thickness of the long fiber web. That is, the split-type two-component composite continuous single yarn of the undivided fiber tends to remain at the center of the thickness of the long fiber web. However, even in such a case, it is still one of the embodiments of the present invention. Although the lower limit of the basis weight of the long fiber web is not particularly limited, it is 10 g / m ^{2 in} consideration of the formation of the obtained composite nonwoven fabric.
Up to a degree is preferred.

In the present invention, the short fiber web is laminated on at least one surface of the long fiber web, and the constituent fibers are entangled and integrated. The long fiber web for laminating the short fiber web is a split-type web. Even in the case of a long fiber web which is partially thermocompressed and made of a component-based composite continuous single yarn, a length in which the two components forming the single yarn are split in advance and at least a part of the ultrafine split filament group is developed. It may be a fiber web.

[0025] As a method of splitting the two components forming a single yarn in advance from a partially fibrous web that has been partially thermocompression-bonded to at least partially express a group of ultrafine split filaments, the long fiber web is placed in a liquid or mechanically. A method of splitting by splitting by rubbing (buckling), or a method of splitting the web by applying a high-pressure liquid flow to a long fiber web and giving an impact thereto is applied.

As a method of splitting splitting in a liquid or by mechanical kneading (buckling), for example, a long fiber web is pushed into a push-type crimper through a buckling machine, that is, a pair of rolls, and kneading is performed. Splitting by buckling the long fiber web through a pair of gear rolls, splitting by passing the long fiber web through a plurality of guides, bending and bending, long fiber A method of immersing a web in a liquid and splitting the web by a liquid flow may be used.

The method of splitting by splitting by applying a high-pressure liquid stream and applying an impact is the same as the water stream used when the long-fiber web and short-fiber web of the present invention are entangled and integrated with each other. Refers to splitting and splitting the long fiber web by a water stream (high-pressure liquid stream) obtained by jetting the web at a high pressure.

By preliminarily performing the split splitting treatment, in the subsequent lamination and integration entanglement with the short fiber web, entanglement and integration of the constituent fibers can be performed with the energy of the low-pressure liquid flow. Therefore, the higher the splitting rate in the split splitting process to be performed in advance, the lower the energy of the high-pressure liquid flow can be to perform the confounding integration of the constituent fibers. Here, the splitting rate means that any ten places of the long fiber web are selected, and the cross section is magnified 100 times and a cross-sectional photograph is taken. Thirty filaments are randomly selected from one cross-sectional photograph, and the splitting rate is determined by the following equation. The same operation is performed for ten cross-sectional photographs, and the average value of the obtained values is defined as the splitting rate of the long fiber web. Splitting rate (%) = (30 / X) × 100
In the above formula, X represents the total number of split filaments made of a low-melting polymer and split filaments made of a high-melting polymer, assuming that the splitting is complete.

In particular, in the present invention, the splitting rate is preferably 60% or more in order to efficiently perform the subsequent entanglement and integration processing of the constituent fibers and obtain a composite nonwoven fabric having excellent delamination strength. It is more preferably at least 80%, further preferably at least 90%.

In the present invention, the long fiber web on which the short fiber web is laminated is preliminarily subjected to splitting processing in accordance with the specification of the high-pressure liquid flow energy in the subsequent lamination integrated entanglement processing and the required performance of the composite nonwoven fabric. It is only necessary to appropriately select a long fiber web that has not been split or a long fiber web that has been split in advance by the above various methods.

In-liquid or mechanical kneading (buckling)
By the method of splitting at, the long fiber web in which the ultrafine splitting filament group is expressed in advance has a high degree of freedom of the filament because the ultrafine splitting filament group is in an unentangled state, and the gap between the filaments is large. Therefore, in the subsequent lamination and integration entanglement treatment with the short fiber web, the constituent fibers of the short fiber web easily enter and entangle between the ultrafine split filament groups without restriction. Therefore, the entanglement and integration of the laminate can be performed with low liquid flow energy, and the resulting composite nonwoven fabric has excellent flexibility and excellent delamination strength.

A long fiber web in which a group of ultrafine splitting filaments is developed in advance by a method of splitting splitting by applying a high-pressure liquid flow and giving an impact is obtained by splitting almost all split-type bicomponent composite continuous single yarns. An ultra-fine split filament group in a confounding state is exhibited. Therefore, in the subsequent lamination and integration entanglement with the short fiber web, the high-pressure liquid flow treatment may be performed only for the purpose of entanglement and integration of the constituent fibers.

In the case of the long fiber web which has not been subjected to the splitting treatment in advance, in the subsequent lamination and integration entanglement treatment with the short fiber web, the action of splitting and splitting the split type two-component composite continuous single yarn has been demonstrated. This is performed simultaneously with the action of three-dimensionally confounding and integrating the fine filament groups or the split filament group with the short fibers or short fibers. Therefore, the energy of the high-pressure liquid flow in the confounding integration process is higher than the method using a long fiber web in which a group of ultrafine splitting filaments is expressed in advance, and the obtained composite nonwoven fabric is slightly inflexible. The process is simplified. In addition, the obtained composite nonwoven fabric has excellent filter performance that is densely entangled and integrated.

In the composite nonwoven fabric of the present invention, short fiber webs are laminated on at least one surface of the long fiber web, and the constituent fibers are entangled and integrated. The short fiber web is mainly made of at least one kind of natural fiber such as cotton, wool, linen and silk or regenerated fiber such as rayon, and may contain other fibers as long as the object of the present invention is not impaired. Good. In the present invention, by using natural fibers and / or regenerated fibers as constituent fibers of the short fiber web, it is possible to impart excellent water absorption to the obtained conjugate fibers.

In addition, a bristles made of the above fibers may be used. In this case, examples of the bristles that can be effectively used include a rat machine, a knot breaker, a garnet machine, and a turning machine. The anti-hair machine to be used and the type and combination
Depending on the shape of the fabric, such as woven or knitted fabric, and the thickness or twist strength of the constituent yarns, the same anti-hair machines can be connected in series, or two or more anti-hair machines can be combined. It is more effective when used. It is preferable that the defibration rate by this anti-hair machine is in the range of 30 to 95%. If the defibration rate is less than 30%, not only the unwoven fibers are present in the card web, but also the surface of the nonwoven fabric becomes rough. The high pressure liquid flow does not sufficiently penetrate the portion, which is not preferable. Here, the defibration rate is obtained by the following equation.

Fibrillation ratio (%) = (weight of bristles-weight of yarn) × 100 / weight of bristles Also, for example, higher mechanical properties or bulkiness are imparted to the short fiber web. Depending on the required performance, short fibers made of a thermoplastic polymer may be mixed in less than 30% by weight. Representative examples of the thermoplastic polymer include a polyolefin-based polymer, a polyamide-based polymer, and a polyester-based polymer, and may be a copolymer of these polymers and other components. Further, the cross-sectional shape of the yarn is not limited to a round cross-section, and may be appropriately selected, such as a hollow cross-section, a flat cross-section, a modified cross-section, or a multi-leaf cross-section.

The basis weight of the short fiber web is preferably about 100 g / m ² or less. When the basis weight exceeds 100 g / m ² , a large high-pressure liquid flow energy is required in the entanglement treatment of the long fiber web and the short fiber web, and the application is limited. The lower limit of the basis weight is not particularly limited, but may be about 10 g / m ² .

The short fiber web can be obtained with a predetermined weight using a carding machine, and the degree of arrangement of the constituent fibers can be selected variously according to the use of the composite nonwoven fabric. For example, as the arrangement pattern of the constituent fibers of the short fiber web, a parallel web in which the constituent fibers are arranged in one direction, a web in which the parallel webs are cross-laid, a random web in which the constituent fibers are randomly arranged, or a medium arrangement of both. Semi-random webs and the like.

The present invention relates to an ultrafine splitting method comprising splitting the above-mentioned long fiber web (partially thermocompressed long fiber web made of a split type two-component composite continuous single yarn or a two-component forming fiber in advance) into an ultrafine splitting fiber. A high-pressure liquid flow treatment is applied to a laminate obtained by laminating a short fiber web on at least one surface of a long fiber web in which at least a part of a filament group is expressed, and the constituent fibers of the long fiber web and the long fiber web and the short fiber web are formed. It is a composite nonwoven fabric in which constituent fibers and short fiber webs are three-dimensionally entangled and integrated. Here, the constituent fibers of the long fiber web refer to a split type two-component composite continuous single yarn and a group of ultrafine split filaments developed from it.

This laminate is obtained by laminating a short fiber web on at least one surface of a long fiber web. Even when a short fiber web is laminated on both surfaces of a long fiber web,
A long fiber web may be laminated on both sides of a short fiber web, and may be appropriately selected in accordance with the use and performance of the composite nonwoven fabric.

Next, the high-pressure liquid flow processing method will be described in detail. As the high-pressure liquid flow device, for example, a hole diameter of 0.05 to 1.
Injection holes of 5 mm, especially 0.1 to 0.4 mm, having a hole interval of 0.
A large number of devices arranged in a single row or a plurality of rows with a size of 05 to 5 mm are used. A water stream, ie, a high-pressure liquid stream, obtained by jetting at a high pressure from the jet holes is jetted, and collides with the laminate placed on the porous support member. The undivided split-type bicomponent composite continuous yarn develops an ultrafine split filament by the impact of the high-pressure liquid flow, and the ultrafine split filaments group generated by the splitting is an ultrafine split filament group or ultrafine split filaments. The filament group and the short fibers or short fibers are three-dimensionally entangled and integrated.

The arrangement of the injection holes is arranged in a row in a direction perpendicular to the traveling direction of the laminate. As a high pressure liquid flow,
Room temperature or hot water can be used. The distance between the injection hole and the laminate is preferably 10 to 150 mm. If this distance is less than 10 mm, the formation of the composite nonwoven fabric obtained by this treatment is disturbed, while the distance is 1 mm.
If it exceeds 50 mm, the impact force when the liquid stream collides with the laminate tends to be low, so that split splitting and entanglement integration tend not to be sufficiently performed.

The processing pressure of the high-pressure liquid flow is controlled by the production method and the required performance of the nonwoven fabric, but generally, a high-pressure liquid flow of 20 to 200 kg / cm ² G is preferably ejected. In addition, depending on the basis weight of the web to be processed, etc., within the range of the above-mentioned processing pressure, if the processing pressure is low, a composite nonwoven fabric which is bulky and excellent in flexibility can be obtained. It is possible to obtain a composite nonwoven fabric which is densely entangled and has excellent filter performance without delamination. When the pressure of the high-pressure liquid flow is less than 20 kg / cm ² G, split splitting and entanglement unification are not sufficiently performed, and the obtained composite nonwoven fabric has poor delamination strength, and an intended composite nonwoven fabric is obtained. Can not. On the other hand, if the pressure of the high-pressure liquid flow exceeds 200 kg / cm ² G, the nonwoven fabric obtained by cutting the constituent fibers tends to have fluff on the surface, which is unfavorable in severe cases due to the impact by water pressure. .

The porous support member for supporting the laminate used for performing the high-pressure liquid flow treatment includes, for example, 2
There is no particular limitation as long as the high-pressure liquid flow penetrates the laminate, such as a mesh screen or a perforated plate made of a wire mesh or synthetic resin of 0 to 200 mesh.

After the high-pressure liquid flow treatment is performed from one side of the laminate, the entangled laminate is reversed and subjected to the high-pressure liquid flow treatment, so that the front and back surfaces of the composite nonwoven fabric are densely entangled and integrated. Can be obtained depending on the use of the composite nonwoven fabric, and may be applied to those having a large number of laminations and those having a large basis weight of the laminate.

After the high-pressure liquid flow treatment, excess moisture is removed from the laminated body after the treatment. When removing the excess moisture, 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 then the remaining moisture is removed using a drying device such as a suction band type hot-air circulation dryer to obtain the composite of the present invention. A non-woven fabric can be obtained.

As described in detail above, the composite nonwoven fabric of the present invention is obtained by laminating a long-fiber web composed of a two-component composite continuous single yarn and a short-fiber web composed of natural fibers and / or regenerated fibers. This is a composite nonwoven fabric in which both webs are densely entangled and integrated using a processing apparatus. The two-component composite continuous single yarn is
Since it divides and expresses a split split fine filament group,
The long-fiber web has a fiber having an irregular cross-section, such as a wedge or a flake, or a fiber with an extremely small fineness. Due to the presence of the split fine fiber group, the entanglement in a high-pressure liquid flow is excellent, the entanglement becomes a stable nonwoven fabric that is difficult to unwind, and the delamination strength with the short fiber web is excellent.

In the composite nonwoven fabric of the present invention, the higher the splitting ratio, the more excellent the flexibility and the entanglement of the composite nonwoven fabric,
It tends to have excellent delamination strength. The splitting rate in the composite nonwoven fabric may be appropriately selected according to the use of the composite nonwoven fabric. For example, when used as an industrial wiper or the like, the splitting rate is about 30%. When used as a household wiper for wiping glasses or mirrors, the splitting rate is about 50%. When used as a filter cloth, the splitting rate is about 70%. % Or more.

The composite nonwoven fabric of the present invention is used for medical and hygiene materials,
It is suitable for various fields such as clothing, living related materials, industrial materials and the like. For example, as an example, it is suitable to be used for wiping with a wiper or the like. That is, wiping is performed on the surface of the long fiber web of the composite nonwoven fabric, dirt and the like are wiped off at the sharp edge portion in the irregular cross section of the group of split fine filaments, and moisture and the like are contained between the constituent fibers of the long fiber web by capillary action. And
The water impregnated between the constituent fibers of the long fiber web can be transferred to the short fiber web having water absorbency, where the water is retained.

In the high-pressure liquid flow treatment, the pressure of the liquid flow is appropriately selected, and the composite nonwoven fabric of the present invention in which the constituent fibers are tightly and tightly entangled has excellent filter performance. It is suitable for use as a filter for diatomaceous earth filtration, for removing particles from well water, and for filtering cloth for iron removal.

[0051]

Next, the present invention will be described more specifically based on examples, but the present invention is not limited to these examples. In the examples, the measurement of each characteristic value was performed by the following method. (1) Melting point (° C.) of polymer: DS manufactured by PerkinElmer
Using a C-2 type differential scanning calorimeter, the heating rate was 20 ° C. /
The temperature giving the maximum value of the melting endothermic peak measured in minutes was defined as the melting point.

(2) Relative viscosity of polyethylene terephthalate (a): A mixture of equal weights of phenol and tetrachloroethane was used as a solvent, and 0.5 g of a sample was added to 100 cc of the solvent.
Was dissolved and determined by a conventional method at a temperature of 20 ° C.

(3) Relative viscosity of nylon 6 (b): 96
% Sulfuric acid was used as a solvent, and 1 g of a sample was dissolved in 100 cc of the solvent.

(4) Fineness (denier) after splitting the fibers constituting the long fiber web: The cross-sectional area was calculated from the shape and dimensions of the electron micrograph, and the density was corrected.

(5) Tensile strength of nonwoven fabric (kg / 5cm
Width): The maximum tensile strength was measured from a test piece having a width of 5 cm and a length of 10 cm according to the stripping method described in JIS L 1096.

(6) Softness (g) of nonwoven fabric: width 5 cm,
A test piece with a length of 10 cm is bent laterally into a cylindrical object,
Each of the joined ends was used as a bending resistance measurement sample.
The sample was compressed in the transverse direction at a compression rate of 5 cm / min using a constant-speed extension-type tensile tester, and the average of the obtained maximum load values was defined as the softness of the nonwoven fabric.

(7) Delamination strength of nonwoven fabric (g / 5 cm)
Width): A test piece having a width of 5 cm and a length of 10 cm was applied to the longitudinal direction of the composite nonwoven fabric by using a constant-speed extension-type tensile testing machine, and the ends of the long fiber web layer and the short fiber web layer were applied to the check of the testing machine. The average value of the load values when sandwiched and peeled at a pulling rate of 10 cm / min was defined as the delamination strength of the nonwoven fabric.

(8) Water absorption (mm / 10 minutes) of nonwoven fabric:
It was measured according to the birec method described in JIS L 1096.

Example 1 As a fiber-forming low-melting polymer, the melting point was 128 ° C., AS
Using polyethylene having a melt index value of 25 g / 10 min measured by the method of TM-D-1238 (E), and having a melting point of 258 as a fiber-forming high melting polymer.
A polyethylene terephthalate having a relative viscosity (a) of 1.38 ° C. was used. Using a composite spinneret in which the cross section of the yarn is a composite form shown in FIG. 1 and the polyethylene forms a core and the total number of divisions is 7, the composite ratio of the polyethylene polymer and the polyethylene terephthalate polymer is 1: 1: The melt spinning was performed at a discharge rate of single holes of 1.2 g / min. After cooling the spun yarn, the yarn is taken out at a speed of 4500 m / min by an air sacker, spread by a known spreader, collected and deposited on a moving collecting surface to form a long fiber web, The fiber web was subjected to partial thermocompression bonding using a hot emboss roller under the conditions of a point pattern, a processing temperature of 120 ° C., and a pressing area ratio of 10%, to obtain a long fiber web having a basis weight of 30 g / m ² . The fineness of the split type two-component composite continuous single yarn collected from the fiber assembly was 2.4 denier.

The obtained long fiber web was subjected to splitting treatment of a polyethylene polymer and a polyethylene terephthalate polymer by using a buckling machine (Microcreper, manufactured by Microtex). Observation of the long fiber web after the splitting processing with a microscope revealed that the splitting filament made of a polyethylene polymer and the splitting filament made of a polyethylene terephthalate polymer were each in an unentangled state, and the splitting rate was 92%. . The fineness of the split filament made of a polyethylene polymer was 1.2 denier, and the fineness of the split filament made of a polyethylene terephthalate polymer was 0.2 denier.

On the other hand, as a short fiber web, cotton fiber having an average single fiber fineness of 1.5 denier and an average fiber length of 25 mm was used, and the basis weight was 20 g / cm by a random card machine.
to obtain a short fiber web m ^2.

Next, a short fiber web was laminated on one surface of the long fiber web which had been subjected to the split splitting treatment in advance, and was loaded on a 50-mesh wire net and subjected to a high-pressure liquid flow treatment. The high-pressure liquid flow treatment uses a high-pressure liquid flow treatment device in which injection holes having a hole diameter of 0.12 are arranged with a hole area of 0.62 mm, and a liquid flow pressure of 100 kg / cm ² from a position 50 mm above the laminate.
Under the condition of G, the treatment was performed from the short fiber web side. The obtained composite was subjected to removal of excess moisture and drying treatment to obtain a composite nonwoven fabric having a basis weight of 50 g / m ² .

Example 2 Example 1 was the same as Example 1 except that the lyocell fiber obtained by melt spinning (trade name: Soryu Jyon, 1.3 dtex × 38 mm, manufactured by Lenting Co.) was used as the short fiber web. Under the condition, the basis weight is 50g /
to obtain a composite nonwoven m ^2.

Example 3 In Example 1, 80% by weight of cotton fiber and 20% by weight of polyethylene terephthalate short fiber (2 denier × 38 mm) were used as the short fiber web to obtain a basis weight of 2%.
A composite nonwoven fabric having a basis weight of 50 g / m ² was obtained under the same conditions as in Example 1 except that a short fiber web of 0 g / m ² was used.

Example 4 The same polyethylene polymer and polyethylene terephthalate polymer as in Example 1 were used, and a composite spinneret having a yarn cross section as shown in FIG. 2 and a total division number of 12 was used.
The composite ratio of the polyethylene polymer and the polyethylene terephthalate polymer was set to 1: 1 by weight, and the single hole discharge amount was 1.1.
It was melt spun at 2 g / min. After cooling the spun yarn, the yarn is taken out at a speed of 4200 m / min by an air sacker, opened by a known opening device, collected and deposited on a moving collecting surface to form a long fiber web, Partial thermocompression bonding was performed on the long fiber web using a hot embossing roller under the conditions of a point pattern, a processing temperature of 120 ° C., and a press contact area ratio of 10%.
A long fiber web of 0 g / m ² was obtained. The fineness of the split type bicomponent composite continuous single yarn collected from the fiber assembly was about 2.4 denier.

The obtained long fiber web was subjected to splitting treatment of a polyethylene polymer and a polyethylene terephthalate polymer using a buckling machine (Microcreper, manufactured by Microtex Co., Ltd.). When the long fiber web after the split splitting treatment was observed with a microscope, the split filament made of a polyethylene polymer and the split filament made of a polyethylene terephthalate polymer were each in an unentangled state, and the split rate was 85%. Was. The fineness of the splitting filament made of a polyethylene polymer and that of the splitting filament made of a polyethylene terephthalate polymer are each 0.1.
It was 2 denier. A composite nonwoven fabric with a basis weight of 50 g / m ² was obtained under the same high-pressure liquid flow treatment conditions as in Example 1 for the short fiber web and the lamination and entanglement integration treatment.

Example 5 The long fiber web obtained in Example 1 was subjected to a high-pressure liquid flow treatment in advance to perform a splitting treatment of a polyethylene polymer and a polyethylene terephthalate polymer. That is, 10
A long-fiber web is loaded on a 0-mesh wire mesh, and a high-pressure liquid flow treatment device in which injection holes having a hole diameter of 0.12 are arranged with a hole area of 0.62 mm is used. The treatment was performed under a pressure of 50 kg / cm ² G. When the long fiber web after the splitting treatment was observed with a microscope, splitting filaments made of a polyethylene polymer and splitting filaments made of a polyethylene polymer and a splitting filament made of a polyethylene terephthalate polymer and made of a polyethylene terephthalate polymer The split filaments were in an entangled state, and the split rate was 85%. A composite nonwoven fabric with a basis weight of 50 g / m ² was obtained under the same high-pressure liquid flow treatment conditions as in Example 1 for the short fiber web and the lamination and entanglement integration treatment.

Example 6 A short fiber web similar to that of Example 1 was laminated on one side of the long fiber web obtained in Example 1 and subjected to the partial thermocompression treatment but not splitting, and a high-pressure liquid Using a flow treatment device,
The splitting and entanglement treatment was performed under the same conditions as in Example 1 to obtain a composite nonwoven fabric having a basis weight of 50 g / m ² . When the composite nonwoven fabric after splitting was observed with a microscope, the splitting rate was 72%.

Example 7 Nylon 6 having a melting point of 210 ° C. and a relative viscosity of 2.6 was used as the fiber-forming low-melting polymer, and the same polyethylene terephthalate as in Example 1 was used as the fiber-forming high-melting polymer. It was used. The cross section of the yarn is a composite form as shown in FIG. 1. Using a composite spinneret in which nylon 6 forms a core and the total number of divisions is 7, the composite ratio of nylon 6 polymer and polyethylene terephthalate polymer is expressed by weight. The ratio was 1: 1 and the melt was spun at a single hole discharge rate of 1.28 g / min. After cooling the spun yarn, it was taken out at a speed of 4800 m / min by an air sacker, opened by a known opening device, and collected and deposited on a moving collecting surface to obtain a long fiber web. The long fiber web was subjected to partial thermocompression bonding under the conditions of a point pattern, a processing temperature of 205 ° C., and a press contact area ratio of 10% using a hot emboss roller to obtain a long fiber web with a basis weight of 30 g / m ² .
The fineness of the split type two-component composite continuous single yarn collected from the fiber assembly was about 2.4 denier.

The obtained long fiber web was treated with nylon 6 using a buckling machine (Microcreper, manufactured by Microtex).
The splitting treatment of the polymer and the polyethylene terephthalate polymer was performed. When the long fiber web after the splitting treatment was observed with a microscope, the splitting filament made of a nylon 6 polymer and the splitting filament made of a polyethylene terephthalate polymer were each in an unentangled state, and the splitting rate was 95%. The fineness of the split filament made of nylon 6 polymer was 1.2 denier, and the fineness of the split filament made of polyethylene terephthalate polymer was 0.2 denier. On the other hand, a cotton fiber having an average single fiber fineness of 1.5 denier and an average fiber length of 25 mm was used as a short fiber web, and a short fiber web having a basis weight of 20 g / m ² was obtained using a random card machine. Then
The laminate was entangled under the same conditions as in Example 1 to obtain a composite nonwoven fabric having a basis weight of 50 g / m ² .

Example 8 Using the same polyethylene polymer and polyethylene terephthalate polymer as in Example 1, a composite spinneret having a yarn cross-section as shown in FIG. 2 and a total division number of 24 was used.
The composite ratio of the polyethylene polymer and the polyethylene terephthalate polymer was set to 3: 1 by weight ratio, and the single hole discharge amount was 0.9.
It was melt spun at 6 g / min. After cooling the spun yarn, the yarn is taken up by air soccer at a speed of 3600 m / min, spread by a known spreader, collected and deposited on a moving collecting surface to form a long fiber web, Partial thermocompression bonding was performed on the long fiber web using a hot embossing roller under the conditions of a point pattern, a processing temperature of 120 ° C., and a press contact area ratio of 10%.
A long fiber web of 0 g / m ² was obtained. The fineness of the split type two-component composite continuous single yarn collected from the fiber assembly was about 2.4 denier.

The obtained long fiber web was subjected to a splitting treatment of a polyethylene polymer and a polyethylene terephthalate polymer by a buckling machine (Microcreper, manufactured by Microx Corporation). When the long fiber web after the split splitting treatment was observed with a microscope, the split filament made of a polyethylene polymer and the split filament made of a polyethylene terephthalate polymer were each in an unentangled state, and the split rate was 82%. Was. The fineness of the split filament made of polyethylene polymer is 0.15 denier,
The fineness of the split filament made of the polyethylene terephthalate polymer was 0.05 denier. A composite nonwoven fabric with a basis weight of 50 g / m ² was obtained under the same high-pressure liquid flow treatment conditions as in Example 1 for the short fiber web and the lamination and entanglement integration treatment.

Example 9 In Example 1, the basis weight of the long fiber web was 20 g /
m ² , the basis weight of the short fiber web was 15 g / m ^2, and the basis weight was 50 g in the same manner as in Example 1 except that the short fiber web was laminated on both sides of the long fiber web during the lamination and entanglement integration treatment.
/ M ² was obtained.

Comparative Example 1 The same polyethylene terephthalate as in Example 1 was melt-spun at a single hole discharge rate of 1.33 g / min using a single-phase spinneret having a round yarn cross section. After cooling the spun yarn, it is taken out at a speed of 5000 m / min by an air sacker, opened by a known opening device, collected and deposited on a moving collecting surface to form a long fiber web, Long fiber web with hot emboss roller, point pattern, processing temperature 240
Perform partial thermocompression bonding under the condition of ℃, pressure contact area ratio 10%,
A long fiber web having a basis weight of 30 g / m ² was obtained. The fineness of the single-phase continuous single yarn collected from the fiber assembly was about 2.4 denier.

On the other hand, as a short fiber web, cotton fiber having an average monofilament fineness of 1.5 denier and an average fiber length of 25 mm was used, and a basis weight of 20 g / cm2 was obtained with a random card machine.
to obtain a short fiber web m ^2. Next, the laminate was entangled under the same conditions as in Example 1 to obtain a composite nonwoven fabric having a basis weight of 50 g / m ² .

Comparative Example 2 A short fiber web having a basis weight of 50 g / m ^{2 made} of the same cotton as in Example 1 was subjected to entanglement treatment under the same conditions as in Example 1 using a liquid flow treatment device, and the constituent fibers were A short-fiber nonwoven fabric three-dimensionally entangled and integrated was obtained.

The physical properties and the like of the composite nonwoven fabrics and nonwoven fabrics obtained in Examples 1 to 9 and Comparative Examples 1 and 2 were measured and are shown in Table 1.

[0078]

[Table 1]

As is clear from Table 1, the composite nonwoven fabric of Example 1 is a long fiber web obtained by splitting a two-component composite continuous single yarn composed of a polyethylene polymer and a polyethylene terephthalate polymer in advance by buckling treatment. This was a composite nonwoven fabric obtained by laminating and a short fiber web made of Kotton and subjected to entanglement treatment using a liquid flow treatment device, and was excellent in all of tensile strength, peeling strength, flexibility and water absorption.

In Example 2, a long-fiber web obtained by splitting and splitting a two-component composite continuous single yarn of a polyethylene polymer and a polyethylene terephthalate polymer in advance by buckling and a short fiber web of lyocell were laminated. Example 1 is a composite nonwoven fabric subjected to entanglement treatment using a liquid flow treatment device.
Similarly to the above, it was excellent in all of tensile strength, peeling strength, flexibility and water absorption.

In Example 3, a two-component composite continuous single yarn composed of a polyethylene polymer and a polyethylene terephthalate polymer was split and split by buckling in advance, and a short fiber web composed of cotton mixed with cottone and polyethylene terephthalate. And a composite nonwoven fabric which was subjected to entanglement treatment using a liquid flow treatment device, and was slightly inferior in water absorption, but excellent in flexibility, tensile strength and peel strength.

In Example 4, a long fiber web in which the fineness of a splitting filament made of a polyethylene polymer was made smaller than that in Example 1 and a long fiber web was split in advance by buckling treatment and a short fiber web made of cotton were used. The composite nonwoven fabric was laminated and entangled using a liquid flow treatment device, and was excellent in all of tensile strength, peeling strength, flexibility, and water absorption.

In Example 5, a long fiber web obtained by splitting a bicomponent continuous fiber composed of a polyethylene polymer and a polyethylene terephthalate polymer in advance by liquid flow treatment and a short fiber web made of Kotton were laminated. The composite nonwoven fabric was subjected to liquid flow entanglement using a high-pressure liquid flow treatment device, and was excellent in all of tensile strength, peel strength, flexibility, and water absorption.

In Example 6, a long fiber web made of a bicomponent continuous fiber composed of a polyethylene polymer and a polyethylene terephthalate polymer and a short fiber web made of Kotton were laminated and split using a liquid flow treatment device. Since the composite nonwoven fabric was subjected to the treatment and the entanglement treatment at the same time, it was somewhat excellent in peel strength and flexibility, excellent in tensile strength, and excellent in water absorption.

In Example 7, a long fiber web obtained by splitting a bicomponent continuous fiber composed of a nylon 6 polymer and a polyethylene terephthalate polymer in advance by a buckling treatment and a short fiber web made of Kotton were laminated. Since it was a composite nonwoven fabric subjected to splitting and entanglement treatment using a liquid flow treatment device, it was somewhat excellent in flexibility, excellent in peeling strength and water absorption, and particularly excellent in tensile strength.

In Example 8, the fineness of the splitting filament made of a polyethylene polymer was made extremely smaller than that in Example 1, and the long fiber web was split and split in advance by buckling treatment, and the short fiber web made of cotton was used. And a composite nonwoven fabric which was subjected to entanglement treatment using a liquid flow treatment device. The composite nonwoven fabric was excellent in tensile strength, water absorption, flexibility and peeling strength.

Example 9 is a short fiber web made of cotton on both sides of a long fiber web obtained by splitting a two-component composite continuous single yarn consisting of a polyethylene polymer and a polyethylene terephthalate polymer in advance by buckling. This was a composite non-woven fabric obtained by laminating and a entanglement treatment using a liquid flow treatment device, and was slightly superior in tensile strength, flexibility, superior in peel strength, and particularly excellent in water absorption.

On the other hand, Comparative Example 1 is a composite nonwoven fabric obtained by performing an entanglement treatment using a long-fiber web composed of a single-phase continuous fiber as the long-fiber web. The peeling strength was remarkably inferior to the use at all.

Comparative Example 2 was a single-layer nonwoven fabric obtained by performing entanglement treatment on a short fiber web made of cotton, so that the tensile strength was remarkably inferior, and the use was limited.

Example 10 Example 1 was repeated except that the liquid flow pressure was set to 30 kg / cm ² G by the high-pressure liquid flow treatment device.
Under the same conditions as above, a composite nonwoven fabric having a basis weight of 50 g / m ² was obtained. The physical properties of the obtained composite nonwoven fabric are as follows: tensile strength: 21 kg /
The width was 5 cm, the compression hardness was 26 g, the peel strength was 380 g, and the water absorption was 120 mm / 10 minutes.

The long fiber web in which the group of ultra-fine splitting filaments is developed in advance by the buckling treatment has a high degree of freedom of the filament and a large gap between the filaments because the group of ultra-fine splitting filaments is in an unentangled state. In addition, the constituent fibers of the short fiber web easily enter and become entangled. Therefore, although the water pressure of the high-pressure liquid flow treatment in the lamination integration was set to a low water pressure, the obtained composite nonwoven fabric of Example 10 was excellent in peeling strength and particularly excellent in flexibility.

[0092]

The composite nonwoven fabric of the present invention is obtained by laminating a long fiber web composed of a two-component composite continuous single yarn with a short fiber web composed of natural fibers and / or regenerated fibers, and using a high-pressure liquid flow treatment apparatus. Because it is a composite nonwoven fabric in which the web is densely entangled and integrated, it has high mechanical properties and peel strength, excellent flexibility, good filter performance and water absorption, and is used for medical and hygiene materials, clothing, It is suitably used in various fields such as for living related materials and industrial materials.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of a cross section of a two-component composite continuous single yarn used in the present invention.

FIG. 2 is a schematic diagram of one embodiment of a cross section of a two-component composite continuous single yarn used in the present invention.

FIG. 3 is a schematic diagram showing one embodiment of a cross section of a two-component composite continuous single yarn used in the present invention.

FIG. 4 is a schematic diagram of one embodiment of a cross section of a two-component composite continuous single yarn used in the present invention.

Continuing from the front page (72) Inventor Katsunobu Suzuki 4-1 Hina-Kitamachi, Okazaki-shi, Aichi Prefecture Unitika Corporation Inside the Okazaki Plant (72) Inventor Yasuhiro Yonezawa 4-1 Hina-Kitamachi, Okazaki-shi, Aichi Prefecture Unitika Corporation Inside the Okazaki Plant (72) Inventor Nobuo Mimasa 4-1 Unita Kitamachi, Okazaki City, Aichi Prefecture Inside the Unitika Okazaki Plant

Claims (5)

[Claims] 1. A fiber-forming low-melting polymer and a fiber-forming high-melting polymer incompatible with the low-melting polymer and having a melting point 30 to 180 ° C. higher than the melting point of the low-melting polymer. A long-fiber web composed of a group of ultrafine splitting filaments composed of the low-melting polymer and the high-melting polymer, which is developed by dividing a split type two-component composite continuous single yarn, and short fibers mainly composed of the following short fibers The web is laminated, and the constituent fibers of the long fiber web and the constituent fibers of the long fiber web and the short fiber web and the constituent fibers of the short fiber web are integrated by three-dimensional confounding. Composite nonwoven. Short fiber: at least one of natural fibers such as cotton, wool, linen, and silk and regenerated fibers such as rayon. 2. The composite nonwoven fabric according to claim 1, wherein a short fiber made of a thermoplastic polymer is mixed with the short fiber web in an amount of less than 30% by weight. 3. A fiber-forming low-melting polymer and a fiber-forming high-melting polymer incompatible with the low-melting polymer and having a melting point 30 to 180 ° C. higher than the melting point of the low-melting polymer. The split continuous two-component composite continuous single yarn group is melt-spun, and the composite continuous single yarn group is taken up using an air sacker, spread and deposited on a movable collecting surface such as a screen conveyor to form a web. The composite continuous single yarn group is subjected to a partial thermocompression treatment using a partial thermocompression device,
Obtain a long fiber web, laminating a short fiber web mainly composed of the following short fibers on at least one surface of the long fiber web,
Subsequently, the laminate is subjected to a high-pressure liquid flow treatment to three-dimensionally entangle and integrate the constituent fibers of the long fiber web, the constituent fibers of the long fiber web and the short fiber web, and the constituent fibers of the short fiber web. A method for producing a composite nonwoven fabric, comprising: Short fiber: at least one of natural fibers such as cotton, wool, linen, and silk and regenerated fibers such as rayon. 4. As a long fiber web for laminating short fiber webs, the composite continuous single yarn present in a portion which is not thermocompression-bonded by partially buckling a partially thermocompressed long fiber web is split. The ultrafine splitting filament group composed of a low-melting-point polymer or a high-melting-point polymer is expressed at least in part, and the ultrafine splitting filament group uses a non-entangled long fiber web. Item 4. The method for producing a composite nonwoven fabric according to Item 3. 5. A continuous fiber which is present in a part which is not thermocompression-bonded by applying a high-pressure liquid flow to a partly thermocompression-bonded long fiber web as a long fiber web for laminating short fiber webs. By causing at least a part of the ultrafine splitting filament group composed of the low melting point polymer or the high melting point polymer, and using a long fiber web in which the ultrafine splitting filament groups are three-dimensionally entangled. The method for producing a composite nonwoven fabric according to claim 3, characterized in that: