JPS59211666A - Interlaced nonwoven fabric good in extensibility and production thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an entangled nonwoven fabric with excellent elasticity. More specifically, the present invention relates to an entangled nonwoven fabric that does not substantially undergo structural deformation even when subjected to repeated elongation deformation, that is, has excellent elasticity and fiber entanglement properties, and has a substantial feel. It is something.

Conventionally, entangled nonwoven fabrics with excellent elasticity have been produced by depositing short fibers obtained by spinning polyurethane in 7 lashes and bonding the fiber intersections by a method such as self-adhesion, or by Japanese Patent Application Laid-Open No. 52-81177. As described in , polyurethane long fiber nonwoven fabrics obtained by the spunpond method are known. However, in these polyurethane m-fiber nonwoven fabrics, the fibers themselves have strong elasticity and are too soft, so it is difficult to form sufficient fiber entanglement using conventionally known entanglement methods such as needle punching and fluid jetting methods. Therefore, these methods cannot produce a nonwoven fabric with good fiber entanglement properties.

In addition, as a nonwoven fabric with elasticity and strength, for example, Japanese Patent Application Laid-Open No. 413-18579 discloses an elastic fiber 5
A nonwoven fabric obtained by blending ~80% by weight with inelastic fibers has been proposed. However, since elastic fibers have incomparably different stiffness and elongation elastic behavior than inelastic fibers, it is necessary to sufficiently blend these fibers and run them on a carding machine to obtain a good web and also to obtain good entanglement. This is extremely difficult. Also, JP-A-52-855
Publication No. 7j describes a method of making an entangled nonwoven fabric using composite fibers consisting of a non-elastic polymer and a monoelastic polymer, and then peeling each component polymer. Because the elastic polymer is constrained in the same state, it is impossible to create a product with sufficient structural elasticity. Mixed spun fibers made of a non-elastic polymer are made into a brittle non-woven fabric, and after dissolving at least one type of non-elastic 1/V polymer in the fibers constituting the obtained non-woven fabric, this non-elastic polymer is A method of re-coagulating within a nonwoven fabric has been proposed. When this method is used, a nonwoven fabric with good entanglement properties can be obtained, but on the other hand, the stretchability of this nonwoven fabric is dominated by fibers made of inelastic polymers, so this nonwoven fabric has sufficient elasticity. It does not have a sexual nature. That is, if this nonwoven fabric is stretched unnecessarily, the nonwoven fabric will become unentangled, resulting in structural destruction.

Therefore, by any of the conventionally known methods, it has not been possible to obtain an entangled nonwoven fabric that has both entanglement and stretchability.

The purpose of the present invention is to have a sufficient blend of elastic fibers and inelastic fibers, to have strength as an entangled nonwoven fabric, uniform elasticity,
The purpose is to obtain an entangled nonwoven fabric having a feeling of fullness.

In other words, the dud is an entangled nonwoven fabric mainly composed of fibers mainly made of an elastic polymer (hereinafter referred to as fibers A) and fibers mainly made of an inelastic polymer (hereinafter referred to as fibers B), and the fibers A are made of non-elastic polymers. The fibers A are formed by removing the inelastic polymer from fibers made of an elastic polymer and the elastic polymer and leaving the elastic polymer, and the fibers A are in a taut state within the entangled nonwoven fabric. On the other hand, B is an entangled nonwoven fabric characterized by being in a loose state.

Such entangled nonwoven fabrics are produced by mixing fibers made of an elastic polymer and an inelastic polymer (hereinafter referred to as fibers C) and fibers made of an inelastic polymer (hereinafter referred to as fibers) to form a web, and then subjected to an entanglement treatment. to produce a nonwoven fabric, and then the following steps (1) and (2): (1) A step of shrinking the nonwoven fabric under conditions in which fibers containing an elastic polymer shrink more than fibers not containing an elastic polymer. , (2) removing the inelastic polymer from the fibers C can be performed in any order.

Next, the above-described manufacturing method for the entangled non-woven fabric of the present invention will be explained in detail.

First, as raw materials constituting the entangled nonwoven fabric with good stretchability of the present invention, a fiber C consisting of an elastic polymer (-), a fiber C consisting of an inelastic polymer, and a fiber C consisting of an inelastic polymer is used. By using a fiber C in which an elastic polymer and an inelastic polymer exist without compatibility, the elongation behavior, stiffness, etc. of the fiber C are extremely similar to those of a fiber made of an inelastic polymer. It becomes what it is.

Therefore, it has good cotton blending properties, and a good entangled state can be obtained by needle punching or fluid jetting.

In the present invention, the term "elastic polymer" refers to a polymer that has an elongation elastic recovery rate of 90% or more after 1 minute when the polymer is formed into a fiber and the fiber is stretched by 50% at room temperature. In addition, the term "inelastic polymer" refers to a polymer whose elongation elastic recovery rate measured in the same manner is 50% or less, or whose limit elongation rate does not reach 50% at room temperature.

Examples of the elastic polymer constituting the fiber C used in the method of the present invention include polyester diol, polyether diol, polyester ether diol,
Average molecular weight of polycarbonate diol, etc. 500-3
Conjugated diene polymer or conjugated diene polymer block such as polyurethanes, polyisoprene, polybutadiene, etc., obtained by reacting at least one selected from 50o polymer diols, an organic diisocyanate, and a chain extender having two active hydrogen atoms. Examples include polymers having in the molecule, and polymers exhibiting the above-mentioned rubber elastic behavior that can be spun.

On the other hand, the inelastic polymer constituting the fiber Cfc exhibits the elongation behavior described above and is soluble in solvents.
Examples include polyolefins and olefin copolymers such as polyethylene, polypropylene, and polybutylene, polystyrene or styrene copolymers, polyvinyl chloride or vinyl chloride copolymers, polyester/L/s, polycarbonates, and the like.

The nine combinations of elastic polymers and inelastic polymers are selected from combinations of elastic polymers and inelastic polymers that have different solubility in specific solvents, those that have overlapping thermoforming temperature ranges, or those that have a common solvent or are compatible. A polymer is used that can be dissolved in a certain solvent and that does not cause any reaction or interaction between these polymers that would impede spinning within the time required for spinning in a dissolved state. As an example of a combination,
For example, polyurethane-polyolefin, polyurethane-polystyrene, polyurethane-polyolefin/
Examples include polystyrene, conjugated diene polymer-polystyrene, and conjugated diene polymer-polyester. The proportion of the elastic polymer in the fibers C is 30 to 80% by weight, preferably 40=70% by weight.

To obtain fibers C from these polymers, wet spinning, dry spinning, or melt spinning can be applied, but melt spinning is preferable. Fiber C can be produced by melting or melting an elastic polymer and an inelastic polymer in the same melting system or the same melting system and spinning, or by melting or dissolving the elastic polymer and an inelastic polymer in different melting systems or melting systems, respectively. It can be obtained by a method of spinning the mixed flows by combining them at a spinning head or a spinneret to form a mixed flow. The fibers C are drawn under conditions such as dry heat, wet heat, or hot water, as required. It may also be subjected to treatments such as compressing it as necessary or cutting it to an appropriate length, preferably 20 to 100 nlC. The fibers obtained in this way have elastic polymers and inelastic polymers coexisting and integrated within the fibers, so their behavior as elastic fibers is suppressed. It has no gender.

In addition, the inelastic polymer and materials constituting the fiber made of the inelastic polymer used in the method of the present invention, for example, polyethylene terephthalate or a copolymer mainly composed of it, polybutylene terephthalate or a copolymer mainly composed thereof Combined.

Spinnable polyester/L/ such as aliphatic polyester/I/or its copolymer, nylon-6, nylon-66
, nylons represented by nylon-6101 and nylon-12, their candy-spun polyamides, polyolefins such as polyethylene, polypropylene, and polybutylene,
Acrylic copolymer, polyvinyl alcohol7, recycled fibers such as rayon, or c)v
Semi-synthetic a-fibers such as o-acetate, cotton, hemp,
Natural fibers such as wool can also be used.

In the present invention, fibers made of at least two types of non-elastic polymers are used as the fibers, and at least one type of non-elastic polymer is removed from the fibers during the process of manufacturing the entangled nonwoven fabric. If the treatment is performed to leave the elastic polymer, the resulting entangled nonwoven fabric will have even better stretchability and flexibility.

Inelastic polymers constituting such fibers include polystyrene or styrene copolymers, polyvinyl chloride, and polymers that have spinnability in coexistence with spinnable polymers in addition to the synthetic inelastic polymers described above. can be mentioned. Fibers made of at least two types of inelastic polymers are produced by selecting a combination of two or more polymers that have different solubility in a specific solvent from among these inelastic polymers, and then thermoforming them. It is possible to select combinations with overlapping temperatures or combinations that can be dissolved in a common solvent or compatible solvents, and perform wet spinning, dry spinning, or melt-spinning of polymers of these combinations. Examples of combinations of bombers suitable for type A include polyethylene terecrate-polyethylene,
Nylon-6-polyethylene, nylon-6-polyethylene, styrene, polyethylene terephthalate-polystyrene,
Examples include polypropylene-polystyrene and nylon-6-polyvinyl alcohol. In addition, in step (1), which will be explained in detail later, the fibers B or D made of an inelastic polymer have a much smaller shrinkage than the fibers Bl or D containing an elastic polymer (i.e., the fibers A or C). If the amount is small, it may contain an elastic polymer or the like.

When using fibers made of two or more types of polymers as fibers, specific spinning methods for these fibers include spinning by melting or melting in the same melting system or the same melting system, spinning by melting or melting in the same melting system, or spinning using different melting systems or melting systems. Examples include a method of melting or dissolving the mixture in a spinning system and merging it in a spinneret or spinneret to form a mixed system for spinning. The fibers are drawn using a normal drawing method, and then crimped and cut into short fibers.

Next, fibers C and D are blended. The preferred blend ratio depends on whether or not the fiber is later removed of at least one of its constituent polymers.

That is, when at least one type of bomber constituting fiber D-q is later removed, the blend ratio of fiber C and fiber lily is 15 to 85% by weight of H&fiber C, especially 25 to 70% by weight. If the fiber C is not subjected to such treatment, the proportion is preferably 20 to 20% by weight, particularly 65 to 85% by weight. Note that two or more types of fibers made of an elastic polymer and an inelastic polymer may be mixed as the fiber C, and two or more types of fibers made of a type of inelastic polymer or fibers made of a type of inelastic polymer may be mixed as the fiber C. Fibers made of two or more types of inelastic polymers may be used in combination.

After the fibers C and fibers aD are mixed in a predetermined ratio, they are defibrated with a card and formed into a random quep or cross-rag web with a Univer. The web is laminated as necessary and given the desired weight. It is also possible to laminate webs with different cotton blend ratios.

Web weight varies depending on the intended use button, but is generally 10
A range of 0 to 3 DDOg/d is preferred.

Next, a fiber entanglement treatment is performed using a known method to form an entangled nonwoven fabric. The preferred entanglement process is needle punching. The number of needle punches and conditions vary depending on the shape of the needle used and the thickness of the web, but generally 200 to 2500.
It is set in the punch/cd range. If the needle punching conditions are too strong, the fiber entanglement effect will increase, rather than the fiber breakage, which will cause structural destruction and increase the web area, leading to unfavorable results in elasticity. becomes. Furthermore, if there is little entanglement, sufficient stretchability cannot be imparted.

In order to impart sufficient stretch behavior to the entangled nonwoven fabric in the present invention, the entangled nonwoven fabric must be shrunk. The degree of shrinkage is 10 to 8 with respect to the area of the entangled nonwoven fabric before shrinkage treatment.
This is the extent of causing 0% area shrinkage. Moreover, such shrinkage treatment must be carried out such that the fibers containing the elastic polymer shrink more than the fibers that do not contain the elastic polymer. Generally, elastic polymers have a tendency to shrink at lower temperatures than non-elastic polymers.

Therefore, in the present invention, the specific conditions for performing the shrinkage treatment are that fibers containing an elastic polymer shrink, but fibers that do not contain an elastic polymer do not substantially shrink, or even if they shrink, they do not. Preferably, it is carried out under temperature conditions such that the degree of shrinkage is much less than that of fibers containing elastomeric polymers.

By performing such a shrinkage treatment, in the finally obtained entangled nonwoven fabric, the fibers A made of an elastic polymer are shrunk, while the fibers B made of an inelastic polymer (single fibers) are shrunk. If a fiber made of one polymer is used, or if a fiber made of two or more polymers is used without any treatment to remove one of the polymers, fiber B is the same as the fiber. .)
The fiber A has almost no shrinkage or has a much smaller shrinkage than the fiber A, and as a result, the fiber A has a taut state within the entangled nonwoven fabric, whereas the fiber B comes to have a relaxed state. By having such a fiber state in the entangled nonwoven fabric, when an elongation force is applied to the entangled nonwoven fabric, the elongation of the entangled nonwoven fabric is achieved exclusively by the elongation of the fibers A, and the degree of elongation is Within the range in which the fibers B change from a relaxed state to a tensile state, there is virtually no structural destruction of the entangled nonwoven fabric, that is, a state where the fixation by the entangled button or the fixation between the fibers due to the adhesion of elastic fibers comes off. This will not occur. Therefore, the entangled nonwoven fabric does not substantially undergo structural deformation even when repeatedly stretched.

As is clear from the above explanation, there is a very close relationship between the elasticity of the entangled nonwoven fabric of the present invention and the shrinkage rate of the entangled nonwoven fabric in the shrinking process. That is, when a large shrinkage rate is applied, the elastic elongation range of the entangled nonwoven fabric is expanded.

The IFa absorption rate of the entangled nonwoven fabric can be adjusted by the collection processing conditions (temperature, time, tension, etc.), but the potential shrinkage ability (maximum shrinkage rate) of the entangled nonwoven fabric depends on the type of elastic polymer, composition ratio, It is mainly determined by the fiber bendability and cotton blend ratio, which are determined by the latent shrinkage rate of the fiber C, the type of inelastic polymer, the fineness, etc., based on the spinning conditions, drawing ratio, etc. Therefore, by changing these conditions, the shrinkage rate of the entangled nonwoven fabric can be changed arbitrarily.

The step of applying shrinkage to the entangled nonwoven fabric includes (1) a method in which it is carried out in the state of the entangled nonwoven fabric, and (2) a method in which it is carried out simultaneously with or after the step of removing at least one type of polymer from the fibers C or D. Any method may be used, or a combination of these methods may be used to finally obtain the desired area acid i. The shrinkage treatment is carried out by wet heat treatment or dry heat treatment, but it may also be treated in combination with chemicals that do not damage the remaining fiber components. By applying the shrinkage treatment, in addition to the rubber-like elasticity inherent to the fibers of Fiber A, the structural elasticity and compression repulsion of the entangled nonwoven fabric are increased, and the simple comb-like elastic behavior is suppressed. This gives it flexibility with a nice texture.

In the present invention, it is necessary to remove the inelastic polymer from the fibers C constituting the entangled nonwoven fabric. In addition, as mentioned above, when the fiber is made of two or more types of non-elastic polymers, it is necessary to remove at least one type of non-elastic polymer and leave at least one type of non-elastic polymer. and flexibility. The removal method may be any method such as dissolving the polymer to be removed in a solvent or decomposing it with a decomposing agent.

Fibers A and B obtained by removing at least one kind of polymer and leaving at least one kind of polymer are:
A form in which pongee denier fibers are bundled.

It has a form in which a large number of fine holes are arranged in the direction of the fiber axis, or a form in which these are mixed.

However, in the case of fibers made of elastic polymers, the spaces between the fine Denny/l' fibers and the holes arranged in the fiber axis direction disappear due to the agglutination of the elastic polymers, resulting in the formation of the above-mentioned clear shape. However, in any case, the object of the present invention can be fully achieved. In addition, fiber A or B
If the above-mentioned Tsumugi Denier/L/fibers have a bundled form, the fine denier fibers may be continuous and have sufficient length to satisfy the required product strength. It may be discontinuous. Further, it may have a circular cross section or an irregularly shaped cross section.

The step of removing at least one component from each of the fibers C and D and leaving at least one component remains.

It is not necessary to carry out the fiber C and the fibrillation at the same time; it is also possible to remove at least one component from the fibrillation after removing the inelastic polymer from the fiber C, or in the reverse order. However, due to the simplicity of the process, it is preferable to use a method in which the inelastic polymer is removed from the fibers C and at least one component is removed from the fibers at the same time by using a common solvent or a common decomposing agent. preferable.

When the fibers constituting the entangled nonwoven fabric of the present invention include not only fibers A made of an elastic polymer but also fibers B made of an inelastic polymer, which are so-called modified fibers in which at least one component has been removed, the entangled The nonwoven fabric is extremely flexible and has excellent elasticity.

The entangled nonwoven fabric obtained according to the present invention is nullified to a desired thickness to obtain a constant thickness. Or it may be divided into multiple sheets. Since the entangled nonwoven fabric of the present invention has modified fibers made of an elastic polymer mixed relatively uniformly, the surface can be smoothed by ironing or other treatments.

In addition, a softening agent treatment, a dyeing treatment, a water repellent/waterproofing treatment, a flame retardant treatment, etc. may be performed as necessary.

The entangled nonwoven fabric of the present invention is a nonwoven fabric with little unevenness in elongation since the fibers made of elastic polymer are mixed relatively well or are formed as a uniform layer. Furthermore, modified fibers made of elastic polymers adhere to fiber contact areas during shrinkage treatment and modification treatment, resulting in contact points in some areas. Therefore, the structure of the entangled nonwoven fabric obtained in the present invention is that the modified fibers made of elastic polymer have glued contacts and fiber entanglement nodes that occur at the contact parts, and the tension state of each fiber is different from the modified fiber made of elastic polymer. It has a structure in which the legs are almost under tension, and the fibers made of inelastic polymer are loose.

One way to confirm this structural state is to check the shape of the entangled nonwoven fabric after removing one of the fibers from the entangled nonwoven fabric. That is, modified a consisting of an elastic polymer
When i4 is removed by treatment with a solvent, etc., the area of an entangled nonwoven fabric made of non-modified fibers made of an inelastic polymer increases to nearly the area before shrinkage treatment, whereas when fibers made of an inelastic polymer are removed with a solvent, etc. This can be seen from the fact that when removed by treatment, the entangled nonwoven fabric made of modified fibers made of elastic polymer causes almost no change in area or only a small change in area.

This state will be explained using a diagram. FIG. 1 is a structural model diagram of the entangled nonwoven fabric of the present invention. In the figure, 1 is an elastic polymer 5
It is a modified fiber consisting of , which is in a state of tension. 2 is a fiber made of an inelastic polymer and has slack. 3
is the glued part and 4 is the knotted part. Because of this structure, the elongation behavior first involves structural elongation deformation of the inelastic fibers and elongation deformation of the elastic fibers themselves.
Next, elongation deformation by the elastic fibers and elongation deformation by the inelastic fibers are added, so that the stress suddenly increases. In the elongation range where inelastic fibers do not substantially undergo elongation deformation (usually about 15 to 50%), the stress is extremely low and the elasticity is extremely good, whereas inelastic fibers exhibit elongation deformation beyond this range. In this case, a large stress is required for elongation deformation due to the entanglement effect of inelastic fibers. Therefore, the entangled nonwoven fabric of the present invention does not undergo repeated elongation deformation within the elongation range in which the inelastic fibers do not substantially undergo elongation deformation (for example, to the extent that elongation deformation of about 60% occurs). Also, groove ring fracture hardly occurs, and it has good elasticity.

Since the entangled nonwoven fabric of the present invention has excellent elasticity and flexibility, it has many uses such as supports, bands, medical supplies, clothing parts, and its oil.

Next, the present invention will be explained using specific examples, but the present invention is not limited to these examples.

In the examples, parts and percentages refer to weight. In addition, the elongation elastic recovery rate of the polymer used for the fibers in the Examples is the value obtained by the above-mentioned measuring method.

Examples 1 to 4, Comparative Examples 1 and 2 Polyester polyurethane (elongation elastic recovery rate 10Ω) 60 parts and low density polyethylene (5 parts % non-elongation) 4 [
A bicomponent fiber containing polyethylene as a sea component was produced from 7 parts using a melt spinning method, stretched 2.8 times, crimped, and cut into a fiber length of 51 m to form a staple with a fineness of 6 denier (hereinafter referred to as fiber C1). (referred to as ) fc obtained. On the other hand, 50 parts of nylon-6 (elongation elastic recovery rate less than 50) and 50 parts of low-density polyethylene
A bicomponent fiber with polyethylene as the sea component is made by melt spinning, drawn, heat treated, and crimped to obtain a fiber length of 5.
The fibers were cut into 1 mg to obtain stable fibers having a fineness of 4 denier (hereinafter referred to as fiber D1).

Next, fiber C1 and fiber D1 were mixed in the ratio shown in Table 1, and after being carded and defibrated, a random web was formed using a random univer, and the web was alternately woven from both sides with a #40 needle to create a total of 560 fibers. Punch/cd needle punching was performed to produce an entangled nonwoven fabric weighing approximately 400 Q/d. This entangled nonwoven fabric was placed on a Teflon coated sheet and treated in hot air at 135°C in a non-tensioned state to give shrinkage to the entangled nonwoven fabric.

The shrink-treated entangled nonwoven fabric was dipped in hot perchlorethylene at about 80°C and squeezed repeatedly to dissolve and remove the polyethylene, then air-dried to remove the solvent, and then dried in hot air at about 130°C. Heat treatment was applied to form adhesion points where the polyurethane fibers were in contact with each other. The obtained entangled nonwoven fabric contains polyurethane fibers and nylon-6 fibers in a good mixed state, and the polyethylene dissolved fibers have many supple entangled knots and have good elasticity. No structural deformation occurred even after 60% elongation. Table 1 shows the state of the obtained entangled nonwoven fabric.

The entangled nonwoven fabric of the present invention was flexible and had little or no 1R fiber texture peculiar to entangled nonwoven fabrics. The surfaces of the thick samples of Examples 1 and 2 were ironed to make them smooth, and the colored samples were materials that could be used for casual shoes. It is also a thin material that can be used as a supporter.

The samples of Examples 3 and 4 were subjected to a surface napping treatment to obtain suede-like materials.

Table 1 When the entangled nonwoven fabric obtained in the above example was observed under magnification, it was found that the polyurethane fibers were in a taut state, whereas the nylon-6 fibers were in a relaxed state. On the other hand, such a state was not observed in the entangled nonwoven fabric of the comparative example.

Examples 5 to 7, Comparative Example 3 Polyester polyurethane (elongation elastic recovery rate 100%
) and 40 parts of modified polystyrene (50% unstretched) were produced using a melt-spinning method, stretched 2.5 times, crimped, and cut into fibers with a length of 51 and a fineness of 6 denier. (hereinafter referred to as fiber C2 t)i was obtained. On the other hand, a bicomponent fiber made of polyethylene terephcrate (50 parts with an elongation elastic recovery rate of 50 parts and 50 parts of low-density polyethylene) was produced using a melt-spinning method, with polyethylene as the sea component.
Stretching, heat treatment, crimping, cutting into fiber length 5177M, non-shrinkable staple with fineness 4 denier) Lt (hereinafter referred to as fiber D)
2) was obtained.

Next, fiber C2 and fiber D2 were mixed in the ratio shown in Table 2, carded and defibrated to form a cross-woven web, and the web was alternately punched from both sides with a #40 needle for a total of 700 punches. Needle punching (d) was performed to produce an entangled nonwoven fabric weighing approximately 7501/m'. This entangled nonwoven fabric was introduced into perchlorethylene at about 85°C under no tension, and the polystyrene and polyethylene in the fibers were dissolved and removed, and the fabric was shrunk. After squeezing out the solvent, it was pressed and dried in hot air at about 80°C. The resulting entangled nonwoven fabric forms adhesion points due to adhesion in the areas where the polyurethane fibers are in contact with each other, and furthermore, since the polyurethane fibers and polyethylene terephthalate fibers are in a good blended state and are flexible and loose, fiber entanglement nodes are formed. The material had a large amount of .

Table 2 shows the state of the obtained entangled nonwoven fabric.

Table 2 When the state of the fibers of the entangled nonwoven fabrics obtained in these Examples was observed under magnification, it was the same as in Examples 1 to 4.

Examples 8 to 11 Two-component fibers made of 55 parts of polyester polyurethane and 45 parts of low-density polyethylene were produced using a melt spinning method.
．． Stretched 15 times, cut the scratched line, and cut the fineness to 6 denier.
'A staple of fiber (hereinafter referred to as fiber C5) having a fiber length of 51 d and containing low density polyethylene as a sea component was made.

On the other hand, nylon-6 was melt-spun, stretched, and heat-set.
It was crimped and cut to make a fiber stable with a fineness of 2 denier and a fiber length of 51 mm. Next, the fiber C3 and this nylon fiber were mixed with Ml at a certain ratio shown in Table 6, and after being defibrated, a web was formed using a random Univer, and the web was formed using a needle with a needle size of #40. Needle punching is performed alternately from both sides with a total of 700 punches/d, approximately 4 oop
/*I made the final entangled nonwoven fabric. The entangled nonwoven fabric was placed on a Teflon coated sheet and treated in hot air at 165°C in a substantially tension-free state to give shrinkage to the entangled nonwoven fabric.

Next, the shrink entangled nonwoven fabric was repeatedly immersed and squeezed in a hot tor x7 at about 80°C to dissolve and remove the polyethylene, and then the solvent was squeezed out, dried in hot air at about 80°C, and heated. The polyurethane fibers and nylon-6 fibers of the entangled nonwoven fabric are pressed while they are still in the room, and the polyurethane fibers and nylon-6 fibers are in a good blended state. It had elasticity and did not undergo structural deformation even after being stretched beyond 30 degrees. In addition, as a result of enlarging and observing the fiber shape M inside the entangled nonwoven fabrics obtained in these Examples and Comparative Examples, Examples 1 to 4, Comparative Example 1,
It was the same as in case 2.

Table 3 shows the state of the obtained entangled nonwoven fabric.

Table 6 The entangled nonwoven fabric of the present invention is flexible, has little or no fiber texture peculiar to entangled nonwoven fabrics, and is stretchable. However, the entangled nonwoven fabric of the comparative example had a large fiber texture, and when stretched by 30 inches, structural deformation occurred and the recovery rate was low.

Examples 12 to 14, Comparative Examples 6 and 7 Polyester polyurethane 50 parts Tofolystyrene (5
A three-component fiber consisting of 65 parts (0% non-elongated) and 15 parts low-density polyethylene was produced by melt spinning, stretched 6 times, crimped and cut to give a fineness of 6 denier and a fiber length of 511.
A 1 m long staple (referred to as F fiber C4) was made.

On the other hand, non-shrinkable polyethylene terephthalate'lJ&m
(P E TXRK6) T, Aff 1 degree, 1.5 denier stable was used. Next, fiber C4 and this polyethylene terephthalate fiber were mixed at a certain ratio shown in Table 4, hung on a card and defibrated to form a cross-woven web, and the web was cut from both sides with a #40 needle. Needle punching was performed with a total of 560 punches/d of alternating buttons to produce an entangled nonwoven fabric weighing approximately 650 g/d. This entangled nonwoven fabric was immersed in perchlorethylene of about an''C.
The fibers were squeezed to dissolve and remove polystyrene and polyethylene, and then dried in hot air at about 80°C. In addition, in the early stage of drying, the entangled nonwoven fabric was pressed after extraction to form adhesive contact points in the areas where the polyurethane fibers were in contact with each other. In addition, the entangled nonwoven fabric experienced shrinkage during the solvent treatment and drying steps. The polyurethane fibers were in a good blended state and did not undergo structural deformation even after being stretched beyond 30 degrees. Further, when the state of the fibers of the entangled nonwoven fabrics obtained in these Examples and Comparative Examples was observed under magnification, it was found to be the same as in the aforementioned Examples and Comparative Examples, respectively.

Table 4 shows the state of the obtained entangled nonwoven fabric.

Table 4 The entangled nonwoven fabrics of the present invention were flexible, had little or no fiber texture peculiar to entangled nonwoven fabrics, and were stretchable.

[Brief explanation of the drawing]

Figure 1 is an enlarged model of the entangled nonwoven fabric of the present invention, and in the figure, 1 is a fiber made of an elastic polymer, 2
is a fiber made of an inelastic polymer. Patent Applicant Rira Co., Ltd. Agent No patent attorney required Figure 1

Claims (1)

[Claims] 1. An entangled nonwoven fabric mainly composed of fibers A mainly made of an elastic polymer and fibers B mainly made of an inelastic polymer, wherein the fibers A are made of fibers made of an inelastic polymer and an elastic polymer. The fibers are formed by removing the inelastic polymer and leaving the elastic polymer, and the fibers A are in a taut state within the entangled nonwoven fabric, while the fibers B are in a relaxed state. An entangled nonwoven fabric with excellent elasticity. 2. The entangled nonwoven fabric according to claim 1, wherein the fiber B is formed by removing at least one kind of polymer from a fiber made of two or more kinds of inelastic polymers and leaving at least one kind of polymer. . 3. The entangled nonwoven fabric according to claim 1 or 2, wherein the elastic polymer is a polyurethane elastomer. 4. The entangled nonwoven fabric according to claim 1, wherein the inelastic polymer is at least one kind of polymer selected from the group consisting of polyester, polyamide, and polyolefin. 5. Fiber C consisting of an elastic polymer and inelastic polymer and fiber D consisting of an inelastic polymer are mixed to form a web, subjected to an entanglement treatment to produce a nonwoven fabric, and then the following steps (1) and (2) (1) shrinking the nonwoven fabric under conditions in which the fibers containing the elastic polymer shrink more than the fibers that do not substantially contain the elastic polymer; (2) removing the inelastic polymer from the fibers C; A method for producing an entangled nonwoven fabric with excellent elasticity, characterized in that the steps of: are performed in any order. 6. When the fiber is a fiber made of two or more types of inelastic polymers, step (3) of removing at least one type of polymer from the fiber (1) and leaving at least one type of polymer is combined with steps (1) and (3). The manufacturing method according to claim 5, which is carried out in any order in combination with 2). B. The manufacturing method according to claim 6, in which step (2) and step (6) are performed simultaneously.