KR20230054744A - Long-fiber non-woven fabric and manufacturing method of long-fiber non-woven fabric - Google Patents

Abstract

It is composed of long fibers of a bicomponent conjugated yarn containing polyethylene terephthalate and copolyester, and has an apparent density of 0.1 g/cc or more and 0.25 g/cc or less, and an elongation recovery rate at 50% elongation of 55% or more. Long fiber non-woven fabric.

Description

Long-fiber non-woven fabric and manufacturing method of long-fiber non-woven fabric

The present invention (the first invention and the second invention) relates to a long fiber nonwoven fabric and a method for producing the long fiber nonwoven fabric.

BACKGROUND ART Patches, bandages, and the like used in medical applications and the like need to follow movements of the skin caused by moving joints and the like. In addition, in order to prevent curling from occurring at the end during use or to obtain sufficient medicinal effects, a high bulk density is required.

As a nonwoven fabric that can be used for such a purpose, Patent Document 1 contains a two-component polymer of polybutylene terephthalate and polyethylene terephthalate, and long fibers having crimp are fused and fixed in an intermittent region by a low melting point component. Disclosed is a long fiber nonwoven fabric having an apparent density of 0.10 g/cm or more, strength at 50% elongation in the longitudinal and transverse directions of 150 g/cm or less, and elongation recovery rates at 50% elongation of 50% or more in both directions. .

Further, in Patent Literature 2, single fibers including composite fibers in which specific co-polymerization polyethylene terephthalate (A) and polyethylene terephthalate (B) are bonded side by side have an elongation rate of 60% or more and an elongation recovery rate. A nonwoven fabric with 55% or more is disclosed.

Japanese Unexamined Patent Publication No. Hei 07-042061 Japanese Unexamined Patent Publication No. 2013-044070

As described above, conventional long-fiber nonwoven fabrics containing two-component polymers of polybutylene terephthalate and polyethylene terephthalate and non-woven fabrics containing short fibers containing two components of polyethylene terephthalate and copolymerized polyethylene terephthalate It is known. On the other hand, a long-fiber nonwoven fabric containing two components of polyethylene terephthalate and copolymerized polyethylene terephthalate has not been conventionally known.

Conventionally, as a method for producing a long fiber nonwoven fabric, as disclosed in Patent Document 1, a long fiber web collected on a net is crimped and developed, and then the crimped and developed long fiber web is embossed with an emboss roll A method of performing a thermal compression bonding treatment using , and fusion-fixing with a low-melting component in an intermittent region is known.

However, a long-fiber web containing copolymerized polyethylene terephthalate tends to undergo crimping and contraction due to heat. Therefore, in the conventional manufacturing method in which embossing or the like is performed at a high temperature, wrinkles are generated due to rapid shrinkage, and a long fiber nonwoven fabric having a high bulk density and excellent elasticity cannot be obtained.

The present invention (the first invention and the second invention) has been made in view of the above-mentioned problems, and its object is a long-fiber nonwoven fabric containing polyethylene terephthalate and co-polyester, having a high bulk density and excellent It is to provide a long fiber nonwoven fabric having elasticity. Moreover, it is to provide the manufacturing method of the said long-fiber nonwoven fabric.

The inventors of the present invention conducted intensive research on a long-fiber nonwoven fabric containing polyethylene terephthalate and co-polyester. As a result, it was found that a long-fiber nonwoven fabric having a high bulk density and excellent elasticity can be obtained by adopting a novel manufacturing method, and the present invention (first present invention and second present invention) was completed.

That is, the first present invention provides the following.

(1) It is composed of long fibers of a two-component conjugated yarn containing polyethylene terephthalate and co-polyester,

an apparent density of 0.1 g/cc or more and 0.25 g/cc or less;

A long fiber nonwoven fabric characterized by an elongation recovery rate of 55% or more at 50% elongation.

As described above, since the long-fiber web containing co-polyester tends to be crimped and contracted by heat, a long-fiber nonwoven fabric having a high bulk density and excellent elasticity can be obtained in a conventional method for producing a long-fiber nonwoven fabric. couldn't For example, in Patent Document 1, embossing is performed at 185°C or higher, but when embossing at such a high temperature is applied to a long fiber web containing copolymerized polyethylene terephthalate, wrinkles occur due to rapid shrinkage. will do On the other hand, in the first aspect of the present invention, as will be described in detail later, the bulk density is high and It has become possible to obtain a long fiber nonwoven fabric having excellent elasticity.

Thus, according to the first aspect of the present invention, long fibers containing polyethylene terephthalate and co-polyester, having an apparent density of 0.1 g/cc or more and 0.25 g/cc or less, and an elongation recovery rate at 50% elongation of 55% or more A nonwoven fabric may be provided. Since it has an apparent density of 0.1 g/cc or more, when used as a patch or bandage, even if friction occurs with clothing or the like, it is unlikely to be subjected to friction, and curling during use can be prevented. In addition, since the elongation recovery rate at 50% elongation is 55% or more, elasticity is excellent, and the usability is good when used as a patch or bandage.

(2) In the configuration of (1) above, it is preferable that the 5% extension load is 1.0 N/25 mm or less.

When the 5% stretch load is 1.0 N/25 mm or less, when used as a patch or a bandage, it is possible to easily flex the joints such as the elbow.

(3) In the structure of (1) or (2) above, it is preferable that the long fiber is a crimped yarn.

If the long fiber is a crimped yarn, more excellent elasticity is obtained.

(4) In the structures (1) to (3) above, it is preferable that the long fibers have a core-sheath structure.

If the long fiber is a core-sheath structure, it becomes possible to suitably perform crimping processing at the time of manufacture.

(5) In the configuration of (4) above, it is preferable that the center of the core component in the core-sheath structure is eccentric by 2% or more.

In the above core-sheath structure, when the center of the core component is eccentric by 2% or more, crimping can be performed more suitably during production.

(6) In the configurations (1) to (3) above, it is preferable that the long fibers have a side-by-side structure.

If the filament is a side-by-side structure, it becomes possible to appropriately crimp it during production.

(7) In the configurations (1) to (6) above, it is preferable that no mechanical entanglement processing is performed.

As described later in detail, the filament nonwoven fabric according to the first aspect of the present invention is obtained by press-bonding a co-polyester-containing filament web and then subjecting the pre-bonded filament web to a crimping process. Amorphous polyester has a characteristic of being difficult to adhere to at around 130°C, and since restraint due to adhesion points is difficult to occur, in the process of crimping, expansion and contraction are first expressed. And, it can be brought into close contact in a state in which expansion and contraction are expressed. Therefore, no mechanical bridging process is required. In the case of a configuration in which mechanical entanglement treatment is not performed, it can be manufactured at low cost. In addition, compared to the case of employing a needle punch as a mechanical entanglement treatment, the risk of mixing of needles can be avoided.

(8) In the configurations (1) to (7), the dicarboxylic acid component of the copolyester is terephthalic acid, and the glycol component is 50 to 85 mol% of ethylene glycol and 15 to 50 mol% of neopentyl glycol. It is desirable to be

When the dicarboxylic acid component of the copolymerized polyester is terephthalic acid and the glycol component is 50 to 85 mol% of ethylene glycol and 15 to 50 mol% of neopentyl glycol, crystallinity is appropriately lowered, and crimping suitable for long fiber nonwoven fabrics can manifest.

(9) In the structures of (1) to (8) above, it is preferable to use as a base fabric for a patch. That is, the long-fiber nonwoven fabric can be suitably used as a base fabric for a patch.

Moreover, the 2nd present invention provides the following.

(10) It is composed of long fibers of a two-component conjugated yarn containing polyethylene terephthalate and co-polyester,

an apparent density of 0.1 g/cc or more;

A long fiber nonwoven fabric characterized by a 10% elongation recovery rate of 65% or more.

As described above, since the long-fiber web containing co-polyester tends to be crimped and contracted by heat, a long-fiber nonwoven fabric having a high bulk density and excellent elasticity can be obtained in a conventional method for producing a long-fiber nonwoven fabric. couldn't On the other hand, in the second aspect of the present invention, as will be described in detail later, the bulk density is high and It has become possible to obtain a long fiber nonwoven fabric having excellent elasticity.

Thus, according to the second aspect of the present invention, a long fiber nonwoven fabric comprising polyethylene terephthalate and copolyester, having an apparent density of 0.1 g/cc or more and a 10% elongation recovery of 65% or more can be provided. Since it has an apparent density of 0.1 g/cc or more, when used as a patch or bandage, even if friction occurs with clothing or the like, it is unlikely to be subjected to friction, and curling during use can be prevented. In addition, since the 10% elongation recovery rate is 65% or more, the elasticity is excellent, and the usability is good when used as a patch or bandage.

(11) In the structure of (10) above, it is preferable that the long fiber is a crimped yarn.

If the long fiber is a crimped yarn, more excellent elasticity is obtained.

(12) In the structure of (10) or (11) above, it is preferable that the long fiber has a core-sheath structure.

If the long fiber is a core-sheath structure, it becomes possible to suitably perform crimping processing at the time of manufacture.

(13) In the structure of (12) above, it is preferable that the center of the core component in the core-sheath structure is eccentric by 2% or more.

In the above core-sheath structure, when the center of the core component is eccentric by 2% or more, crimping can be performed more suitably during production.

(14) In the structure of (10) or (11) above, it is preferable that the long fiber has a side-by-side structure.

If the filament is a side-by-side structure, it becomes possible to appropriately crimp it during production.

(15) In the configurations (10) to (14) above, it is preferable that no mechanical bridging treatment is performed.

As described in detail later, the filament nonwoven fabric according to the second aspect of the present invention is obtained by press-bonding a co-polyester-containing filament web and then subjecting the pre-bonded filament web to a crimping process. Amorphous polyester has a property of being difficult to adhere to at around 130°C, and since restraint due to adhesion points is difficult to occur, in the process of crimping, expansion and contraction are first expressed. And, it can be brought into close contact in a state in which expansion and contraction are expressed. Therefore, no mechanical bridging process is required. In the case of a configuration in which mechanical entanglement treatment is not performed, it can be manufactured at low cost. In addition, compared to the case of employing a needle punch as a mechanical entanglement treatment, the risk of mixing of needles can be avoided.

(16) In the configurations (10) to (15), the dicarboxylic acid component of the copolyester is terephthalic acid, and the glycol component contains 50 to 85 mol% of ethylene glycol and 15 to 50 mol% of neopentyl glycol. It is desirable to be

When the dicarboxylic acid component of the copolymerized polyester is terephthalic acid and the glycol component is 50 to 85 mol% of ethylene glycol and 15 to 50 mol% of neopentyl glycol, crystallinity is appropriately lowered, and crimping suitable for long fiber nonwoven fabrics can manifest.

In addition, the present invention (first present invention and second present invention) provides the following.

(17) A method for producing the long fiber nonwoven fabric according to (1) to (16) above,

Step A of discharging melted polyethylene terephthalate and co-polyester from a spinneret, cooling and solidifying them, and then pulling and drawing with an ejector to form long fibers of two-component conjugate spinning;

Step B of collecting the long fibers obtained in Step A to form a long fiber web;

Step C of pre-pressing the long fiber web;

Step D of subjecting the precompressed filament web to a crimping process

A method for producing a long fiber nonwoven fabric comprising a.

Since the long-fiber web containing co-polyester tends to undergo crimping and shrinkage due to heat, a long-fiber nonwoven fabric having a high bulk density and excellent stretchability could not be obtained in a conventional method for producing a long-fiber nonwoven fabric. On the other hand, in the present invention (first present invention and second present invention), after press-bonding a long-fiber web containing co-polyester, the pre-bonded long-fiber web is subjected to crimping, so that the bulk density is high, In addition, it has become possible to obtain a long fiber nonwoven fabric having excellent elasticity.

(18) In the configuration of (17) above, it is preferable that the step D is a step of immersing the filament web in boiling water at 80°C or higher.

When the long fiber web is immersed in boiling water of 80° C. or higher, a crimping process can be performed suitable for the long fiber web.

(19) In the configuration of (18) above, it is preferable to include a step E of transversely stretching the filament web after the step D.

After step D, if the filament web is stretched in the transverse direction, a filament nonwoven fabric having a thickness corresponding to the stretching ratio is obtained. That is, the thickness of the obtained long-fiber nonwoven fabric can be adjusted by the draw ratio in the transverse direction.

(20) In the configuration of the above (19), it is preferable to include a step F of calendering the filament web after the step E.

If calendering is performed on the long-fiber web after the step E, the thickness of the obtained long-fiber nonwoven fabric can be more appropriately adjusted by the distance between the rolls in the calendering process. In addition, uniformity of the thickness is achieved.

(21) In the structure of the above (20), it is preferable that the distance between the rolls of the calendering in the step F is 0.1 mm or more.

When the distance between the rolls in the calendering in the step F is 0.1 mm or more, the decrease in the stretching function and the improvement in the initial tensile stress due to the excessive compression of the fibers are suppressed.

(22) In the configuration of (17) above, in step D, the filament web is subjected to crimping while gradually decreasing the speed ratio using two or more heating rollers capable of temperature modulation and changeable speed ratio. It is preferable that it is a process of doing.

When crimping is performed on the long fiber web using two or more heating rollers whose temperature modulation and speed ratio can be changed while gradually decreasing the speed ratio, the crimping process can be suitably performed for long fibers.

(23) In the configurations of (17) to (22) above, the step A uses an eccentric core-sheath nozzle as the spinneret, and the polyethylene terephthalate as a core component and the co-polyester as a sheath component It is preferable to include step A-1 of discharging from the eccentric core-sheath nozzle.

When the eccentric core-sheath nozzle is used as the spinneret, and the polyethylene terephthalate as the core component and the co-polyester as the sheath component are discharged from the eccentric core-sheath nozzle, the subsequent crimping process (step D) In this, it becomes possible to suitably perform the crimping process.

(24) In the configurations of (17) to (23) above, in the step A, the polyethylene terephthalate and the copolyester are side-by-side in the fiber length direction using a side-by-side nozzle as the spinneret. It is preferable to include step A-2 of discharging from the side-by-side nozzle so as to join the mold.

Using a side-by-side nozzle as the spinneret, discharging from the side-by-side nozzle so as to bond the polyethylene terephthalate and the co-polyester side-by-side in the fiber length direction, the subsequent crimping process (step D) ), it becomes possible to perform crimping processing suitably.

(25) In the configurations (17) to (24), the dicarboxylic acid component of the copolyester is terephthalic acid, and the glycol component contains 50 to 85 mol% of ethylene glycol and 15 to 50 mol% of neopentyl glycol. It is desirable to be

When the dicarboxylic acid component of the copolymerized polyester is terephthalic acid and the glycol component is 50 to 85 mol% of ethylene glycol and 15 to 50 mol% of neopentyl glycol, crystallinity is appropriately lowered, and crimping suitable for long fiber nonwoven fabrics can manifest.

According to the present invention (the first invention and the second invention), it is possible to provide a long fiber nonwoven fabric containing polyethylene terephthalate and co-polyester, having a high bulk density and excellent stretchability. In addition, a method for producing the long-fiber nonwoven fabric can be provided.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention (1st invention and 2nd invention) is described.

[Long fiber non-woven fabric]

<Embodiment concerning the 1st present invention>

The long fiber nonwoven fabric according to the first embodiment of the present invention (hereinafter also referred to as "first embodiment"),

It is composed of long fibers of two-component conjugated yarn containing polyethylene terephthalate and co-polyester,

an apparent density of 0.1 g/cc or more and 0.25 g/cc or less;

The elongation recovery rate at 50% elongation is 55% or more.

The long fibers constituting the long fiber nonwoven fabric are composed of a two-component conjugated yarn containing polyethylene terephthalate and co-polyester.

In this specification, a long fiber refers to a fiber whose length during spinning is endless (endless continuous fiber). However, when the finally obtained long-fiber nonwoven fabric is cut to a predetermined length, the length of the long-fiber nonwoven fabric is equal to the length of the long-fiber nonwoven fabric. On the other hand, short fiber means that the length of the fiber contained in the nonwoven fabric is less than the length of the nonwoven fabric. That is, the long fiber nonwoven fabric is a nonwoven fabric composed of fibers (long fibers) having the same length as the length of the nonwoven fabric, and the short fiber nonwoven fabric is a nonwoven fabric composed of fibers (short fibers) less than the length of the short fiber nonwoven fabric.

Since the long fibers contain polyethylene terephthalate, they are excellent in mechanical strength, heat resistance, shape retention, and the like, compared to cases where resins such as polyethylene and polypropylene are used. The content of the polyethylene terephthalate in the long fibers is preferably 20% by mass or more and 80% by mass or less, more preferably 30% by mass or more and 70% by mass or less, still more preferably 40% by mass or more and 60% by mass. less than %. When the content ratio of the polyethylene terephthalate is within the above numerical range, mechanical strength, heat resistance, shape retention, and the like are further excellent. Further, polyethylene terephthalate is a polyester showing an exothermic peak derived from crystallization and/or an endothermic peak derived from crystal melting in measurement by a differential scanning calorimeter (DSC).

The amorphous polyester is a resin that does not have a clear crystallization exothermic peak and crystal melting peak in measurement by differential scanning calorimetry (DSC). Further, the amorphous polyester has a glass transition temperature (Tg) of 50°C or higher. The glass transition temperature (Tg) is a value determined by DSC from the transition point of latent heat at the time of temperature increase at a temperature increase rate of 20°C/min. As said amorphous polyester, heat resistance becomes favorable by employ|adopting what has a glass transition temperature (Tg) of 50 degreeC or more. That is, in the long-fiber nonwoven fabric, in order to improve heat resistance and impact resistance, the amorphous and high Tg co-polyester is employed.

In addition, the crystallinity of the copolyester is lower than that of polyethylene terephthalate (homopolymer). Since the long fiber nonwoven fabric (the long fiber) is a two-component conjugated yarn containing polyethylene terephthalate and co-polyester, when heat-treated, a difference in shrinkage occurs due to a difference in crystallinity, resulting in crimping.

As a copolymerization component of the said copolyester, As a dicarboxylic acid component, Aromatic dicarboxylic acid, such as terephthalic acid and 2, 6 naphthalene dicarboxylic acid; aliphatic dicarboxylic acids such as oxalic acid, succinic acid, adipic acid, sebacic acid, and undecadicarboxylic acid; alicyclic dicarboxylic acids such as hexahydroterephthalic acid; examples of the glycol component include aliphatic glycols such as ethylene glycol, propylene glycol, 1,4-butanediol, neopentyl glycol, and hexamethylene glycol; and aromatic glycols such as bisphenol, 1,3-bis(2-hydroxyethoxy)benzene, and 1,4-(hydroxyethoxy)benzene. These can use 1 type or 2 or more types. The copolymerization component is preferably selected from a range in which the Tg of the copolymerization polyester can be maintained at 50°C or higher.

Among these co-polyesters, the following (a) to (d) are preferable, and (a) is more preferable.

(a) A co-polyester in which the dicarboxylic acid component is terephthalic acid and the glycol component is 50 to 85 mol% of ethylene glycol and 15 to 50 mol% of neopentyl glycol.

(b) A co-polyester in which the dicarboxylic acid component is terephthalic acid and the glycol component is 50 to 85 mol% of ethylene glycol and 15 to 50 mol% of 1,4-cyclohexanedimethanol.

(c) Co-polyester in which the dicarboxylic acid component is terephthalic acid and the glycol component is 50 to 85 mol% of 1,4-butanediol and 15 to 50 mol% of neopentyl glycol.

(d) Co-polyester in which the dicarboxylic acid component is terephthalic acid and the glycol component is 50 to 85 mol% of 1,4-butanediol and 15 to 50 mol% of 1,4-cyclohexanedimethanol.

In the case of the above (a) and the above (b), the content of ethylene glycol is more preferably 50 to 85 mol%, and still more preferably 65 to 75 mol%.

In the case of the above (c) and the above (d), the content of 1,4-butanediol is more preferably 50 to 85 mol%, and still more preferably 65 to 75 mol%.

In the case of the above (a) and the above (c), the content of neopentyl glycol is more preferably 15 to 50 mol%, and more preferably 25 to 35 mol%.

In the case of the above (b) and the above (d), the content of 1,4-cyclohexanedimethanol is more preferably 15 to 50 mol%, and still more preferably 25 to 35 mol%.

The copolyesters (a) to (d) above have moderately reduced crystallinity, and can develop crimping suitable for long-fiber nonwoven fabrics. Further, properties such as thermal stability are suitable.

The content ratio of the co-polyester in the long fibers is preferably 20% by mass or more and 80% by mass or less, more preferably 30% by mass or more and 70% by mass or less, still more preferably 40% by mass or more and 60% by mass. less than %. When the content ratio of the co-polyester is within the above numerical range, crimp can be suitably developed.

It does not specifically limit as a copolymerization method for manufacturing the said copolyester, A conventionally well-known method is employable.

It is preferable that the said long fiber has a core-sheath structure. If the long fiber is a core-sheath structure, it becomes possible to suitably perform crimping processing at the time of manufacture.

In the core-sheath structure, it is preferable that the fiber cross section is eccentric. Specifically, it is preferable that the center of the core component is eccentric by 2% or more, and it is more preferable that it is eccentric by 3% or more. That is, the eccentricity measured by the method described in Examples is preferably 2% or more, and more preferably 3% or more. The central eccentricity of the core component is preferably as large as possible, but can be, for example, 80% or less, 60% or less, and the like.

The core-sheath structure is preferably made of co-polyester on the sheath side and polyethylene terephthalate on the core side, from the viewpoint of obtaining suitable crimping.

It is also preferable that the long fiber has a side-by-side structure in which co-polyester and polyethylene terephthalate are bonded. If the filament is a side-by-side structure, it becomes possible to appropriately crimp it during production.

The fiber diameter of the long fibers is preferably 5 to 60 μm, more preferably 10 μm to 50 μm, still more preferably 12 μm to 40 μm. When the fiber diameter is 5 µm or more, the spinning property by the spunbond method becomes better, and stable production becomes possible. In addition, if the fiber diameter is 60 μm or less, unevenness of the nonwoven fabric is difficult to deepen, and when used as a patch, exudation of the active ingredient can be suppressed.

It is preferable that the long-fiber nonwoven fabric is not subjected to mechanical entanglement treatment. As the mechanical entanglement treatment, for example, entanglement treatment by a needle punch method or a water punch method, and the like are exemplified. When the above mechanical entanglement treatment is not performed, it is preferable in that it can be manufactured at low cost. In addition, it is preferable in that the risk of mixing of needles that may occur when the needle punch method is employed can be avoided. In addition, the water punch method uses a large amount of water and requires enormous energy. Therefore, from the viewpoints of environmental preservation and energy saving, it is preferable that the mechanical entanglement processing is not performed.

The long-fiber nonwoven fabric has an apparent density of 0.1 g/cc or more, preferably 0.11 g/cc or more, and more preferably 0.13 g/cc or more. In addition, the apparent density is 0.25 g/cc or less. The apparent density is preferably as high as possible, but can be, for example, 0.23 g/cc or less, or 0.20 g/cc or less. Since the apparent density is 0.1 g/cc or more, when used as a patch or bandage, even if friction occurs with clothing or the like, friction is less likely to occur, and curling during use can be prevented.

The long-fiber nonwoven fabric has an elongation recovery rate of 55% or more at 50% elongation, preferably 57% or more, and more preferably 60% or more. In addition, the elongation recovery rate at the time of 50% elongation is preferably as large as possible, but it can be, for example, 95% or less, 90% or less, and the like. Since the elongation recovery rate at 50% elongation is 55% or more, elasticity is excellent, and the usability is good when used as a patch or bandage. For example, when applied to a joint such as an elbow, it can follow the movement of the skin of the bent portion and suppress the occurrence of wrinkles. As a result, peeling caused by wrinkles can be prevented.

In addition, in this specification, "the elongation recovery rate at 50% elongation is 55% or more" means the elongation recovery rate at 50% elongation in the MD (machine direction) direction is 55% or more, and CD (cross direction) It means that the elongation recovery rate at the time of 50% elongation in the direction is 55% or more.

The long-fiber nonwoven fabric preferably has a 5% stretch load of 1.0 N/25 mm or less, more preferably 0.8 N/25 mm or less, still more preferably 0.6 N/25 mm or less. Although the 5% elongation load is preferably smaller, it can be, for example, 0.01 N/25 mm or more, 0.05 N/25 mm or more, and the like. When the 5% extension load is 1.0 N/25 mm or less, when used as a patch or a bandage, it is possible to easily flex the joints such as the elbow.

In addition, in this specification, “5% elongation load is 1.0 N/25 mm or less” means that the 5% elongation load in the MD (machine direction) direction is 1.0 N/25 mm or less, and CD (cross direction) It means that the 5% extension load in the direction is 1.0 N/25 mm or less.

Conventionally, although long-fiber nonwoven fabrics made of polyethylene terephthalate and copolymerized polyester have been unable to obtain long-fiber nonwoven fabrics having an apparent density of 0.1 g/cc or more and an elongation recovery rate of 55% or more at 50% elongation. On the other hand, in the first embodiment, a novel manufacturing method, that is, after press-compression of a long-fiber web containing co-polyester, is followed by immersing the long-fiber web in boiling water at 80 ° C. or higher. By performing the crimping process, it became possible to achieve an apparent density of 0.1 g/cc or more and an elongation recovery rate of 55% or more at 50% elongation.

The long-fiber nonwoven fabric is preferably used as a base fabric for a patch. That is, the long-fiber nonwoven fabric can be suitably used as a base fabric for a patch. Since the long-fiber nonwoven fabric has an apparent density of 0.1 g / cc or more, when used as a patch or a bandage, even if friction occurs on clothes or the like, it is difficult to receive friction, and curling during use can be prevented. because there is In addition, since the elongation recovery rate at 50% elongation is 55% or more, it is excellent in elasticity and provides a good feeling when used as a patch or bandage.

In the above, the long fiber nonwoven fabric according to the first embodiment (the first embodiment according to the present invention) has been described.

<Embodiment concerning the second present invention>

Hereinafter, the long fiber nonwoven fabric according to the second embodiment of the present invention will be described. In addition, the long fiber nonwoven fabric according to the second embodiment of the present invention does not have to have an elongation recovery rate of 55% or higher at 50% elongation, as in the first embodiment of the present invention. Further, the long fiber nonwoven fabric according to the second embodiment of the present invention may have an apparent density of 0.1 g/cc or more, and, like the first embodiment of the present invention, an apparent density of 0.1 g/cc or more and 0.25 g/cc or less. There is no need.

[Long fiber non-woven fabric]

The long fiber nonwoven fabric according to the second embodiment of the present invention (hereinafter also referred to as "second embodiment"),

It is composed of long fibers of two-component conjugated yarn containing polyethylene terephthalate and co-polyester,

an apparent density of 0.1 g/cc or more;

The 10% elongation recovery rate is 65% or more.

The long-fiber nonwoven fabric has an apparent density of 0.1 g/cc or more, preferably 0.11 g/cc or more, and more preferably 0.13 g/cc or more. The apparent density is preferably as high as possible, but can be, for example, 0.3 g/cc or less, or 0.28 g/cc or less. Since the apparent density is 0.1 g/cc or more, when used as a patch or bandage, even if friction occurs with clothing or the like, friction is less likely to occur, and curling during use can be prevented.

The long-fiber nonwoven fabric has a 10% elongation recovery rate of 65% or more, preferably 70% or more, and more preferably 80% or more. The 10% elongation recovery rate is preferably as large as possible, but can be, for example, 99.5% or less, 99.0% or less, and the like. Since the 10% elongation recovery rate is 65% or more, the stretchability is excellent, and the usability is good when used as a patch or bandage. For example, when applied to a joint such as an elbow, it can follow the movement of the skin of the bent portion and suppress the occurrence of wrinkles. As a result, peeling caused by wrinkles can be prevented.

In addition, in this specification, "10% elongation recovery rate is 65% or more" means that the 10% elongation recovery rate in the MD (machine direction) direction is 65% or more, and also in the CD (cross direction) direction It means that the 10% elongation recovery rate is 65% or more.

The long fiber nonwoven fabric according to the second embodiment can adopt the same configuration as the long fiber nonwoven fabric according to the first embodiment with respect to the configuration other than the apparent density and 10% elongation recovery rate described above.

However, as described above, the long fiber nonwoven fabric according to the second embodiment does not have to have an elongation recovery rate of 55% or higher at 50% elongation, as in the first embodiment. Further, the long fiber nonwoven fabric according to the second embodiment only needs to have an apparent density of 0.1 g/cc or more, and, like the first embodiment, the apparent density need not be 0.1 g/cc or more and 0.25 g/cc or less.

Conventionally, although long-fiber nonwoven fabrics made of polyethylene terephthalate and copolymerized polyester have been unable to obtain long-fiber nonwoven fabrics having an apparent density of 0.1 g/cc or more and a 10% elongation recovery of 65% or more. On the other hand, in the second embodiment, a novel manufacturing method, that is, by press-compressing a long-fiber web containing co-polyester, and then crimping the pre-bonded long-fiber web to obtain an apparent density of 0.1 g/cc. In addition to the above, it became possible to achieve an elongation recovery rate of 65% or more of 10%.

In the above, the long-fiber nonwoven fabric according to the second embodiment (embodiment concerning the second present invention) has been described.

Next, the method for producing the long-fiber nonwoven fabric according to the present embodiment (first embodiment and second embodiment) will be described.

[Method for producing long-fiber nonwoven fabric]

The method for producing the long fiber nonwoven fabric according to the present embodiment,

Step A of discharging melted polyethylene terephthalate and co-polyester from a spinneret, cooling and solidifying them, and then pulling and drawing with an ejector to form long fibers of two-component conjugate spinning;

Step B of collecting the long fibers obtained in Step A to form a long fiber web;

Step C of pre-pressing the long fiber web;

A step D of subjecting the precompressed filament web to a crimping process is provided.

<Process A>

In the method for producing the long-fiber nonwoven fabric according to the present embodiment, first, melted polyethylene terephthalate and co-polyester are discharged from a spinneret, cooled and solidified, and then drawn and drawn by an ejector to make long fibers of bicomponent conjugate spinning. form

This step A can be performed using a conventionally known two-component spunbond spinning machine. That is, the long fibers can be produced by the spunbond method, which is a direct spinning type manufacturing method in which a nonwoven fabric is produced as it is from a fiber making process (spinning process).

As the polyethylene terephthalate and the co-polyester, those described in the section of the long-fiber nonwoven fabric can be employed.

In the step A, it is preferable to spin at a spinning speed of 3500 m/min or more. That is, it is preferable to discharge melted polyethylene terephthalate and co-polyester from a spinneret, cool and solidify, and then pull and draw with an ejector at a spinning speed of 3500 m/min or more to form long fibers of two-component conjugate spinning. . By making the said spinning speed into 3500 m/min or more, the orientation crystallinity of polyester terephthalate becomes high. When the said spinning speed is 3500 m/min or more, orientation advances also in co-polyester. However, co-polyester has low crystallinity, so in the subsequent crimping process (heating step in step D), shrinkage of the components on the co-polyester side occurs, and crimping is favorably expressed. do. The spinning speed is more preferably 3800 m/min or more, and still more preferably 4200 m/min or more. In addition, the said spinning speed is preferably 5500 m/min or less, and more preferably 5000 m/min or less, from a viewpoint of spinning property.

In this specification, the said spinning speed says the value obtained by following formula (1).

Here, V is the spinning speed (m/min), T is the fineness of the single fiber (dtex), and Q is the single hole discharge amount (g/min).

The single hole discharge amount Q is the total of the two components, and is preferably 0.2 to 5 g/min. By controlling the single hole discharge amount Q to 0.2 to 5 g/min, it becomes easy to control the spinning speed V within a desired range. More preferably, it is 0.3-4 g/min, More preferably, it is 0.5-3 g/min. In addition, the fineness T (dtex) of single fibers is a value showing the mass of 10000 meters of single fibers in grams.

In the step A, an eccentric core-sheath nozzle is used as the spinneret, and the polyethylene terephthalate as a core component and the copolyester as a sheath component are discharged from the eccentric core-sheath nozzle Step A-1 It is preferable to include As the eccentric core-sheath nozzle, conventionally known ones can be employed. When the eccentric core-sheath nozzle is used as the spinneret, and the polyethylene terephthalate as the core component and the co-polyester as the sheath component are discharged from the eccentric core-sheath nozzle, the subsequent crimping process (step D) In this, it becomes possible to suitably perform the crimping process.

In the step A, step A- of discharging from the side-by-side nozzle so as to bond the polyethylene terephthalate and the copolymerized polyester side-by-side in the fiber length direction using a side-by-side nozzle as the spinneret. It is also preferable to include 2. As the side-by-side nozzle, a conventionally known nozzle can be employed. Using a side-by-side nozzle as the spinneret, discharging from the side-by-side nozzle so as to bond the polyethylene terephthalate and the co-polyester side-by-side in the fiber length direction, the subsequent crimping process (step D) ), it becomes possible to perform crimping processing suitably.

In the said process A, it is preferable to employ|adopt either the said process A-1 or the said process A-2.

Even in the case of employing either the above process A-1 or the above process A-2, discharge is performed from a spinneret having an orifice diameter of 0.1 to 0.5 mm, and dry air is blown into the ejector at a pressure (jet pressure) of 1.5 to 4.0 kg/cm 2 . It is preferable to supply and stretch. The orifice diameter of the spinneret is more preferably 0.15 to 0.45 mm, and more preferably 0.18 to 0.45 mm. As for the said jet pressure, 2.0-4.0 kg/cm<2> is more preferable, and 2.5-3.8 kg/cm<2> is still more preferable. By controlling the orifice diameter within the above range, it is easy to obtain a desired fiber diameter. In addition, by controlling the supply pressure (jet pressure) of dry air within the above range, the spinning speed can be easily controlled within a desired range, and drying can be appropriately performed.

<Process B>

Then, the long fibers obtained in step A are collected to form a long fiber web (step B). For example, the filament web may be formed by collecting the filaments while opening them on a conveyor below.

<Process C>

Next, the filament web obtained in step B is pre-compressed (step C). The temporary compression is performed within a temperature range in which the long fiber web does not shrink. Thereby, it becomes possible to convey suitably. The temperature during the temporary compression is preferably 50°C to 80°C, more preferably 55°C to 75°C, still more preferably 60°C to 70°C. The pressure bonding may use a flat roll. The linear pressure at the time of temporary bonding is preferably 1 to 10 kg/cm, more preferably 3 to 7 kg/cm. When the line pressure is within the above numerical range, it is possible to pass through the process without causing breakage due to conveyance.

<Process D>

Next, a crimping process is applied to the precompressed filament web (Step D). The long fibers subjected to the crimping process become crimped yarns.

Step D is preferably a step of immersing the long fiber web in boiling water at 80°C or higher. It is also preferable that the step D is a step of crimping the filament web using two or more heating rollers capable of changing temperature and speed ratio while gradually decreasing the speed ratio.

Below, first, the case where the said process D is a process of immersing the said long-fiber web in boiling water of 80 degreeC or more is demonstrated.

When the step of performing the crimping process (step D) is a step of immersing the filament web in boiling water of 80 ° C. or higher, the temperature of the boiling water is not particularly limited as long as it is 80 ° C. or higher, but 85 ° C. Above is preferable, and 90 degreeC or more is more preferable. The temperature of the boiling water is preferably 99°C or lower, and more preferably 97°C or lower, from the viewpoint of suppressing the occurrence of wrinkles due to rapid shrinkage. Since the temperature of the boiling water is 80° C. or higher, crimping can be performed suitably for long fibers.

The immersion time in the boiling water is not particularly limited, but is preferably 2 seconds or longer, more preferably 3 seconds or longer. If the immersion time in the said boiling water is 5 seconds or more, crimping process can fully be performed. The immersion time in the boiling water can be, for example, 20 seconds or less, 10 seconds or less, etc. from the viewpoint of productivity.

The amount of water used in the boiling water is not particularly limited, but a liquid imparting hydrophilicity may be mixed in order to increase the impregnation rate, or an appropriate amount of neutral detergent or the like may be added in consideration of the environmental aspect.

In the step D, while the long fiber web is immersed in the boiling water, it is preferable not to apply tension in the transverse direction. By not applying tension in the transverse direction, the bulk density can be further increased.

The manufacturing method of the filament nonwoven fabric according to the present embodiment preferably includes a step E of stretching the filament web in the transverse direction after the step D. After step D, if the filament web is stretched in the transverse direction, a filament nonwoven fabric having a thickness corresponding to the stretching ratio is obtained. That is, the thickness of the obtained long-fiber nonwoven fabric can be adjusted by the draw ratio in the transverse direction.

As the stretching method in the step E, stretching using a conventionally known tenter is preferable.

As a draw ratio of the transverse direction in the said process E, 2 % or more is preferable and 5 % or more is more preferable. Moreover, as said draw ratio, 20 % or less is preferable and 15 % or less is more preferable.

In addition, in this specification, the draw ratio in the transverse direction means the draw ratio with respect to the lateral width before extending|stretching. That is, the lateral width after stretching is the width obtained by adding the stretching ratio to 100% of the lateral width before stretching. For example, when the draw ratio is 10%, the lateral width after stretching is 110% with respect to the lateral width before stretching.

The manufacturing method of the long-fiber nonwoven fabric according to the present embodiment preferably includes a step F of subjecting the long-fiber web to a calendering process after the step E. If calendering is performed on the long-fiber web after the step E, the thickness of the obtained long-fiber nonwoven fabric can be more appropriately adjusted by the distance between the rolls in the calendering process. In addition, uniformity of the thickness is achieved.

It is preferable that the distance between the rolls of the calendering process in the said process F is 0.1 mm or more, More preferably, it is 0.2 mm or more. When the distance between the rolls in the calendering in the step F is 0.1 mm or more, the decrease in the stretching function and the improvement in the initial tensile stress due to the excessive compression of the fibers are suppressed. The distance between the rolls is preferably 0.7 mm or less, more preferably 0.5 mm or less, from the viewpoint of suitably adjusting the thickness of the obtained long fiber nonwoven fabric.

The calender temperature (roll temperature) in the step F is preferably 40°C or higher, more preferably 50°C or higher. By setting the calender temperature to 40° C. or higher, the thickness of the fiber nonwoven fabric can be more appropriately adjusted. In addition, uniformity of the thickness is further achieved.

The method for producing the filament nonwoven fabric according to the present embodiment preferably includes a step G of drying the filament web after the step F.

The drying temperature in the step G is preferably 80°C or higher, and more preferably 90°C or higher, from the viewpoint of water removal. Further, the drying temperature is preferably 150°C or lower, and more preferably 130°C or lower, from the viewpoint of suppressing fusion between the fibers.

As drying time in the said process G, from a viewpoint of water removal, 10 second or more is preferable, More preferably, it is 20 second or more. Further, the drying temperature is preferably 100 seconds or less, more preferably 60 seconds or less, from the viewpoint of suppressing fusion between fibers.

In the above, the case where the step D is a step of immersing the long fiber web in boiling water of 80°C or higher has been described.

Next, the case where the step D is a step of crimping the filament web while gradually decreasing the speed ratio using two or more heating rollers whose temperature modulation and speed ratio can be changed will be described.

When the step D is a step of crimping the long fiber web using two or more heating rollers whose temperature modulation and speed ratio are changeable, while gradually decreasing the speed ratio, the heating rollers are It is set to the temperature at which it develops or higher, and shrinkage also occurs, but in this embodiment, in order to perform the crimping process while gradually dropping the speed ratio, the speed ratio of conveyance is lowered by the amount of shrinkage accompanying crimping. , and the occurrence of wrinkles due to rapid contraction can be suppressed.

Two or more are preferable, and, as for the number of objects of the said heating roller, four or more are preferable. By using a plurality of heating rollers and gradually reducing the speed ratio, the area of the long fiber web can be reduced according to the amount of shrinkage, and the occurrence of wrinkles and the like can be suppressed. The upper limit of the number of the heating rollers is not particularly limited, but may be, for example, 12 or less, or 10 or less, from the viewpoint of equipment cost.

The heating temperature (temperature of the heating roller) during crimping is preferably 60 to 150°C, more preferably 70 to 140°C, still more preferably 80 to 130°C. When the heating temperature is within the above numerical range, crimping can be appropriately developed. The conveying speed may be lowered according to the amount of shrinkage of the filament web during crimping.

At the time of crimping, you may perform a nip as needed. It is preferable to perform the nip at the time of the crimping process by the heating roller with the highest temperature. If nip is performed during the crimping process by the heating roller having the highest temperature, adhesion can be improved.

In step D described above, crimping is carried out in a state where the heating roller is brought into contact with it. As a result, it is smooth, has a high apparent density, and can be finished thinly.

In the above, the case where the step D is a step of crimping the long fiber web while gradually decreasing the speed ratio using two or more heating rollers whose temperature modulation and speed ratio can be changed has been described.

In the above, the method for producing the long fiber nonwoven fabric according to the present embodiment has been described.

Example

Hereinafter, the present invention (first present invention and second present invention) will be described in detail using examples, but the present invention (first present invention and second present invention) will be described below without departing from the gist thereof. It is not limited to the examples.

In addition, Examples 1 to 8 below are examples related to the first present invention, and Examples 9 to 14 are examples related to the second present invention.

(Intrinsic Viscosity)

0.1 g of resin (polyethylene terephthalate or copolymerized polyester) was weighed, dissolved in 25 ml of a mixed solvent of phenol/tetrachloroethane (60/40 (weight ratio)), and 3 times at 30° C. using an Ostwald viscometer. It was measured and the average value was calculated|required.

(glass transition temperature)

According to JIS K7122 (1987), the glass transition temperature of co-polyester was determined at a heating rate of 20°C/min.

(importance)

A density gradient solution made of calcium nitrate tetrahydrate is prepared as a density gradient tube, and a specific gravity float range in the range of 1.29 to 1.5 g/cm is used. The memory at the position was read and the specific gravity was determined from the calibration curve of the float.

(weight per unit area)

The mass per unit area was measured according to JIS L1913 (2000) 5.2.

(apparent density (bulk density))

It was converted into the weight per cm<3> from the said weight per unit area and thickness calculated|required based on JIS-L1913 (2010) 5.2, and it was set as the bulk density. Specifically, the thickness was measured using a 0.5 g/cm 2 terminal with a thickness measuring instrument, and the bulk density was determined by dividing the weight per unit area by the thickness.

(fiber diameter)

Five random locations of the sample (long fiber web before pressure bonding) were selected, and the diameters of single fibers were measured at n = 20 using an optical microscope, and the average value was obtained.

(fineness (dtex))

Five random locations of the sample (long fiber fleece before pressure bonding) were selected, and the single fiber diameter was measured at n = 20 using an optical microscope to determine the average single fiber diameter. Five fibers were taken out in the same place, and the specific gravity of the fibers was measured at n = 5 using a density gradient tube to determine the average specific gravity. Subsequently, the fineness [dtex], which is the fiber weight per 10000 m, was determined from the single fiber cross-sectional area and average specific gravity determined from the average single fiber diameter.

(eccentricity)

A metal plate in which a hole of 0.5 to 2 mm was opened was prepared. Further, fibers made of nonwoven fabric were cut out and embedded with black fibers. Fibers made of nonwoven fabric embedded in black fibers were filled in the holes of the metal plate, and both ends were cut with a razor blade. The radius R of the outer circle on the sheath side was measured with an optical microscope connected to a computer in which software capable of measuring distance was introduced. The distance between the central part on the core side and the central part on the sheath side was measured, and this was referred to as the eccentricity distance (L). Then, the eccentricity (%) was obtained by the following formula.

(Eccentricity)=(L/R)×100

(Spinning speed (m/min))

The spinning speed V (m/min) was obtained based on the following formula from the fineness T (dtex) and the single hole discharge amount Q (g/min) of the setting.

V=(10000×Q)/T

(Elongation recovery rate at 50% elongation)

A sample of 25 × 150 mm was prepared. Using a constant rate extension type tensile tester equipped with a magnetic recording device, it was installed at a gripping interval of 50 mm in a state of tension to the extent that it could not be loosened by hand, and the initial load was set to 0.02 N/25 mm. "(gripping interval) + (length elongated when initial load was applied)" at this time was set as L0. After that, it was stretched to 50% (25 mm elongation) of the gripping interval at a tensile speed of 25 mm/min. The length at this time was referred to as L1. Immediately thereafter, the length of the sample weighed down to the initial load at the same speed was defined as L2. The elongation recovery rate at 50% elongation was determined by the following formula. Measurements were made at n = 5 in the vertical and horizontal directions, respectively, and the average value was rounded to one decimal place.

Elongation recovery rate at 50% elongation (%)=[(L1-L2)/(L1-L0]×100

(5% elongation load)

A sample of 25 × 150 mm was prepared. Using a constant rate extension type tensile tester with a magnetic recording device, it was installed at a gripping interval of 50 mm in a state in which it was tensioned so as not to loosen by hand, and stretched to 5% of the gripping interval at a tensile speed of 25 mm / min. . The initial load was 0.02 N/25 mm, and the value obtained by correcting "(initial gripping distance 50 mm) + (length elongated when initial load was applied)" at this time was defined as the gripping distance. The load when stretched to 5% was defined as a 5% elongation load.

(10% elongation recovery rate)

A sample of 25 × 150 mm was prepared. Using a constant rate extension type tensile tester equipped with a magnetic recording device, it was installed at a gripping interval of 50 mm in a state of tension to the extent that it could not be loosened by hand, and the initial load was set to 0.02 N/25 mm. "(gripping interval) + (length elongated when initial load was applied)" at this time was set as L0. After that, it was stretched to 10% (5 mm elongation) of the gripping interval at a tensile speed of 25 mm/min. The length at this time was referred to as L1. Immediately thereafter, the length of the sample weighed to the initial load at the same speed was defined as L2. The 10% elongation recovery rate was determined by the following formula. Measurements were made at n = 5 in the vertical and horizontal directions, respectively, and the average value was rounded to one decimal place.

10% elongation recovery rate (%)=[(L1-L2)/(L1-L0]×100

(Evaluation of peelability)

A medical adhesive applied to a nonwoven fabric of 140 mm × 100 mm was applied to the elbows of five subjects, and a long-sleeved shirt was worn, and the condition was judged after 8 hours. In the case of grades 2 to 5, it was judged that peeling was suppressed.

Level 0: Dropped

Grade 1: More than half delamination

Grade 2: 1/3 exfoliation

Class 3: 1/5 exfoliation

Grade 4: Slight delamination at the end

Grade 5: no peeling

(Example 1)

Using a side-by-side nozzle in a two-component spunbond spinning facility, polyethylene terephthalate (intrinsic viscosity (iv value): 0.63) and copolymerized polyester (dicarboxylic acid component is terephthalic acid and glycol component is ethylene glycol 70 mol%) and a copolymer of 30 mol % of neopentyl glycol, intrinsic viscosity (iv value): 0.75, Tg: 75° C.) at a mass ratio of 5.5 (polyethylene terephthalate): 4.5 (copolymerized polyester). The discharge was performed at a single hole discharge rate of 1.0 g/min from a spinneret having an orifice diameter of 0.36 mm. After that, dry air was further supplied to the ejector at a pressure (jet pressure) of 3.5 kg/cm 2 , drawing was performed in one step, and the fibers were collected while being opened onto a conveyor below to obtain a long fiber web. Next, the obtained long fiber web was pre-bonded. The conditions for the pre-bonding were a pre-bonding roll temperature of 60°C and a linear pressure of 5 kg/cm.

The filament web thus obtained had a fiber diameter of 14.5 μm, a spinning speed of 4500 m/min, and a weight per unit area of 25 g/m 2 .

Then, the obtained long fiber web was immersed in boiling water. The temperature of boiling water and the immersion time in boiling water were as shown in Table 1. In addition, when immersed in boiling water, tension is not applied in the transverse direction.

After immersing the long fiber web in boiling water, the long fiber web was stretched in the transverse direction. The draw ratio was as described in Table 1.

After stretching the filament web in the transverse direction, calendering was performed on the filament web.

The calender temperature (roll temperature) and the distance between the rolls (calender clearance) in calendering were as described in Table 1.

After subjecting the long fiber web to calendering, the long fiber web was dried. The drying temperature was as described in Table 1. As a result, the nonwoven fabric according to Example 1 was obtained.

(Example 2)

Using a core-sheath nozzle with an eccentricity of 0.1 mm, a co-polyester (dicarboxylic acid component is terephthalic acid, and a glycol component is a copolymer of 70 mol% ethylene glycol and 30 mol% neopentyl glycol) is applied to the sheath side. A nonwoven fabric was obtained under the same conditions as in Example 1 except that the viscosity (iv value): 0.75, Tg: 75°C) and the transverse stretch ratio changed to 8%.

(Example 3)

Polyethylene terephthalate and copolymerized polyester (a copolymer in which the dicarboxylic acid component is terephthalic acid and the glycol component is 70 mol% of ethylene glycol and 30 mol% of neopentyl glycol, intrinsic viscosity (iv value): 0.75, Tg: 75 ° C.) A nonwoven fabric was obtained under the same conditions as in Example 2 except that the ratio was 6.5:3.5 and the transverse stretch ratio was changed to 5%.

(Example 4)

As a cis-side co-polyester, the dicarboxylic acid component is terephthalic acid, and the glycol component is a copolymer containing 85 mol% of ethylene glycol and 15 mol% of neopentyl glycol (intrinsic viscosity (iv value): 0.75, Tg: 75°C) A nonwoven fabric was obtained under the same conditions as in Example 2 except for using and changing the transverse stretch ratio to 3%.

(Comparative Example 1)

A nonwoven fabric was obtained under the same conditions as in Example 3, except that the boiling water temperature was changed as shown in Table 1 and transverse stretching was not performed. In addition, the reason why transverse stretching was not performed is that in Comparative Example 1, the weight per unit area before transverse stretching was small. That is, in each Example and Comparative Example, transverse stretching was performed to make the obtained nonwoven fabric have the same weight per unit area (about 100 g / m 2 ), but in Comparative Example 1, the unit area weight before transverse stretching is small, and transverse stretching This was not done because the weight per unit area would be smaller.

(Comparative Example 2)

A nonwoven fabric was obtained under the same conditions as in Example 3, except that the calender clearance was changed as shown in Table 1.

(Comparative Example 3)

A nonwoven fabric was obtained under the same conditions as in Example 3, except that the calender clearance was changed as shown in Table 1.

(Comparative Example 4)

As a copolymerized polyester, a copolymer (intrinsic viscosity (iv value): 0.75, Tg: 75°C) in which the dicarboxylic acid component is terephthalic acid and the glycol component is 95 mol% of ethylene glycol and 5 mol% of neopentyl glycol is used. And a nonwoven fabric was obtained under the same conditions as in Example 3 except that transverse stretching was not performed. The reason why transverse stretching was not performed is that in Comparative Example 4, the weight per unit area before transverse stretching was small. That is, in each Example and Comparative Example, the unit area weight of the nonwoven fabric obtained is transversely stretched to the same extent (about 100 g / m 2), but in Comparative Example 4, the unit area weight before transverse stretching is small, and transverse stretching This was not done because the weight per unit area would be smaller.

Weight per unit area of the obtained nonwoven fabric, thickness, apparent density, 5% elongation load in MD direction, 5% elongation load in CD direction, elongation recovery rate at 50% elongation in MD direction, elongation recovery rate at 50% elongation in CD direction, and The peelability evaluation grades were as shown in Table 1.

(Example 5)

Using a side-by-side nozzle in a two-component spunbond spinning facility, polyethylene terephthalate (intrinsic viscosity (iv value): 0.63) and copolymerized polyester (dicarboxylic acid component is terephthalic acid and glycol component is ethylene glycol 70 mol%) and a copolymer of 30 mol% of neopentyl glycol, intrinsic viscosity (iv value): 0.75, Tg: 75°C) at a mass ratio of 5.5 (polyethylene terephthalate): 4.5 (copolymerized polyester). The discharge was performed at a single hole discharge rate of 1.0 g/min from a spinneret having an orifice diameter of 0.36 mm. After that, dry air was further supplied to the ejector at a pressure (jet pressure) of 3.5 kg/cm 2 , drawing was performed in one step, and the fibers were collected while being opened onto a conveyor below to obtain a long fiber web. Next, the obtained long fiber web was pre-bonded. The conditions for the pre-bonding were a pre-bonding roll temperature of 60°C and a linear pressure of 5 kg/cm.

The filament web thus obtained had a fiber diameter of 14.5 μm, a spinning speed of 4500 m/min, and a weight per unit area of 25 g/m 2 .

Next, the filament web thus obtained was subjected to crimping while conveying with six heating rolls. Specifically, the temperature of each heating roll and the speed ratio of each heating roll were premised as shown in Table 2. In addition, a speed ratio means the speed carried out from the exit of each roll with respect to the speed conveyed by a 1st roll from the entrance of a 1st roll. In the case of crimping with the fourth roll, pressurization was performed with a rubber nip roll. As a result, the nonwoven fabric according to Example 5 was obtained.

(Example 6)

Using a core-sheath nozzle with an eccentricity of 0.1 mm, a co-polyester (dicarboxylic acid component is terephthalic acid, and a glycol component is a copolymer of 70 mol% ethylene glycol and 30 mol% neopentyl glycol) is applied to the sheath side. Viscosity (iv value): 0.75, Tg: 75 ° C.) was obtained in the same conditions as in Example 5, except for disposing.

(Example 7)

Polyethylene terephthalate and copolymerized polyester (a copolymer in which the dicarboxylic acid component is terephthalic acid and the glycol component is 70 mol% of ethylene glycol and 30 mol% of neopentyl glycol, intrinsic viscosity (iv value): 0.75, Tg: 75 ° C.) A nonwoven fabric was obtained under the same conditions as in Example 5, except that the ratio was 6.5: 3.5.

(Example 8)

Polyethylene terephthalate and copolymerized polyester (a copolymer in which the dicarboxylic acid component is terephthalic acid and the glycol component is 70 mol% of ethylene glycol and 30 mol% of neopentyl glycol, intrinsic viscosity (iv value): 0.75, Tg: 75 ° C.) A nonwoven fabric was obtained under the same conditions as in Example 6, except that the ratio was 6.5: 3.5.

Weight per unit area of the obtained nonwoven fabric, thickness, apparent density, 5% elongation load in MD direction, 5% elongation load in CD direction, elongation recovery rate at 50% elongation in MD direction, elongation recovery rate at 50% elongation in CD direction, and The peelability evaluation grades were as shown in Table 2.

(Example 9)

Using a side-by-side nozzle in a two-component spunbond spinning facility, polyethylene terephthalate (intrinsic viscosity (iv value): 0.63) and copolymerized polyester (dicarboxylic acid component is terephthalic acid and glycol component is ethylene glycol 70 mol%) and a copolymer of 30 mol % of neopentyl glycol, intrinsic viscosity (iv value): 0.75, Tg: 75° C.) at a mass ratio of 5.5 (polyethylene terephthalate): 4.5 (copolymerized polyester). The discharge was performed at a single hole discharge rate of 1.0 g/min from a spinneret having an orifice diameter of 0.36 mm. After that, dry air was further supplied to the ejector at a pressure (jet pressure) of 3.5 kg/cm 2 , drawing was performed in one step, and the fibers were collected while being opened onto a conveyor below to obtain a long fiber web. Next, the obtained long fiber web was pre-bonded. The conditions for the pre-bonding were a pre-bonding roll temperature of 60°C and a linear pressure of 5 kg/cm.

The filament web thus obtained had a fiber diameter of 14.5 μm, a spinning speed of 4500 m/min, and a weight per unit area of 25 g/m 2 .

Next, the filament web thus obtained was subjected to crimping while conveying with six heating rolls. Specifically, the temperature of each heating roll and the speed ratio of each heating roll were premised as shown in Table 1. In addition, a speed ratio means the speed carried out from the exit of each roll with respect to the speed conveyed by a 1st roll from the entrance of a 1st roll. In the case of crimping with the fourth roll, pressurization was performed with a rubber nip roll.

The obtained nonwoven fabric had a weight per unit area of 100 g/m2, a thickness of 0.8 mm, an apparent density of 0.13 g/cc, a 10% elongation recovery rate of 84% in the MD direction, a 10% elongation recovery rate of 87% in the CD direction, and a peelability evaluation grade of 5. .

(Example 10)

Using a core-sheath nozzle with an eccentricity of 0.1 mm, a co-polyester (dicarboxylic acid component is terephthalic acid, and a glycol component is a copolymer of 70 mol% ethylene glycol and 30 mol% neopentyl glycol) is applied to the sheath side. Viscosity (iv value): 0.75, Tg: 75 ° C.) was obtained in the same conditions as in Example 9 except for disposing.

The obtained nonwoven fabric had a weight per unit area of 98 g/m2, a thickness of 0.75 mm, an apparent density of 0.13 g/cc, a 10% elongation recovery rate of 78% in the MD direction, a 10% elongation recovery rate of 83% in the CD direction, and a peelability evaluation grade of 4. .

(Example 11)

Polyethylene terephthalate and copolymerized polyester (a copolymer in which the dicarboxylic acid component is terephthalic acid and the glycol component is 70 mol% of ethylene glycol and 30 mol% of neopentyl glycol, intrinsic viscosity (iv value): 0.75, Tg: 75 ° C.) A nonwoven fabric was obtained under the same conditions as in Example 9 except that the ratio was 6.5: 3.5.

The obtained nonwoven fabric had a weight per unit area of 95 g/m2, a thickness of 0.9 mm, an apparent density of 0.11 g/cc, a 10% elongation recovery rate of 71% in the MD direction, a 10% elongation recovery rate of 72% in the CD direction, and a peelability evaluation grade of 3. .

(Example 12)

Polyethylene terephthalate and copolymerized polyester (a copolymer in which the dicarboxylic acid component is terephthalic acid and the glycol component is 70 mol% of ethylene glycol and 30 mol% of neopentyl glycol, intrinsic viscosity (iv value): 0.75, Tg: 75 ° C.) A nonwoven fabric was obtained under the same conditions as in Example 10 except that the ratio was 6.5: 3.5.

The obtained nonwoven fabric had a weight per unit area of 97 g/m2, a thickness of 0.92 mm, an apparent density of 0.11 g/cc, a 10% elongation recovery rate of 67% in the MD direction, a 10% elongation recovery rate of 70% in the CD direction, and a peelability evaluation grade of 3. .

(Example 13)

As a cis-side co-polyester, the dicarboxylic acid component is terephthalic acid, and the glycol component is a copolymer containing 85 mol% of ethylene glycol and 15 mol% of neopentyl glycol (intrinsic viscosity (iv value): 0.75, Tg: 75°C) A nonwoven fabric was obtained under the same conditions as in Example 10 except for using.

The obtained nonwoven fabric had a weight per unit area of 97 g/m2, a thickness of 0.85 mm, an apparent density of 0.11 g/cc, a 10% elongation recovery rate of 65% in the MD direction, a 10% elongation recovery rate of 67% in the CD direction, and a peelability evaluation grade of 3. .

(Example 14)

As copolyester, a copolymer (intrinsic viscosity (iv value): 0.75, Tg: 75°C) in which the dicarboxylic acid component is terephthalic acid and the glycol component is 50 mol% ethylene glycol and 50 mol% neopentyl glycol is used. A nonwoven fabric was obtained under the same conditions as in Example 9 except for this.

The obtained nonwoven fabric had a thickness of 110 g/m 2 , a thickness of 0.8 mm, an apparent density of 0.14 g/cc, a 10% elongation recovery rate of 86% in the MD direction, a 10% elongation recovery rate of 88% in the CD direction, and a peelability evaluation grade of 5.

(Comparative Example 5)

A spunbonded nonwoven fabric was obtained under the same conditions as in Example 9, except that crimping was performed by hot air passing at 130°C instead of using a heating roll.

The obtained nonwoven fabric had a thickness of 101 g/m 2 , a thickness of 1.3 mm, an apparent density of 0.08 g/cc, a 10% elongation recovery rate of 88% in the MD direction and a 10% elongation recovery rate of 89% in the CD direction, and a peelability evaluation grade of 1 grade.

(Comparative Example 6)

Polyethylene terephthalate and copolymerized polyester (a copolymer in which the dicarboxylic acid component is terephthalic acid and the glycol component is 70 mol% of ethylene glycol and 30 mol% of neopentyl glycol, intrinsic viscosity (iv value): 0.75, Tg: 75 ° C.) An attempt was made to obtain a nonwoven fabric under the same conditions as in Example 9 except that the weight ratio of 8.5: 1.5, but shrinkage due to crimping hardly occurred.

(Comparative Example 7)

As a copolymerized polyester, a copolymer (intrinsic viscosity (iv value): 0.75, Tg: 75°C) in which the dicarboxylic acid component is terephthalic acid and the glycol component is 95 mol% of ethylene glycol and 5 mol% of neopentyl glycol is used. Other than that, an attempt was made to obtain a nonwoven fabric under the same conditions as in Example 9, but almost no shrinkage due to crimping occurred.

Claims (25)

It is composed of long fibers of two-component conjugated yarn containing polyethylene terephthalate and co-polyester,
an apparent density of 0.1 g/cc or more and 0.25 g/cc or less;
A long fiber nonwoven fabric characterized by an elongation recovery rate of 55% or more at 50% elongation. The long fiber nonwoven fabric according to claim 1, wherein the 5% elongation load is 1.0 N/25 mm or less. The long fiber nonwoven fabric according to claim 1 or 2, wherein the long fibers are crimped yarns. The long fiber nonwoven fabric according to any one of claims 1 to 3, wherein the long fibers have a core-sheath structure. The long fiber nonwoven fabric according to claim 4, wherein the core-sheath structure has a center of the core component eccentric by 2% or more. The long fiber nonwoven fabric according to any one of claims 1 to 3, wherein the long fibers have a side-by-side structure. The long fiber nonwoven fabric according to any one of claims 1 to 6, characterized in that it is not subjected to mechanical entanglement treatment. The copolyester according to any one of claims 1 to 7, wherein the dicarboxylic acid component is terephthalic acid and the glycol component is 50 to 85 mol% of ethylene glycol and 15 to 50 mol% of neopentyl glycol. Characterized by a long fiber nonwoven fabric. The long-fiber nonwoven fabric according to any one of claims 1 to 8, which is used as a base fabric for a patch. It is composed of long fibers of two-component conjugated yarn containing polyethylene terephthalate and co-polyester,
an apparent density of 0.1 g/cc or more;
A long fiber nonwoven fabric characterized by a 10% elongation recovery rate of 65% or more. The long fiber nonwoven fabric according to claim 10, wherein the long fibers are crimped yarns. The long fiber nonwoven fabric according to claim 10 or 11, wherein the long fiber has a core-sheath structure. The long fiber nonwoven fabric according to claim 12, wherein the core-sheath structure has a center of the core component eccentric by 2% or more. The long fiber nonwoven fabric according to claim 10 or 11, wherein the long fibers have a side-by-side structure. The long fiber nonwoven fabric according to any one of claims 10 to 14, which is not subjected to mechanical entanglement treatment. The copolyester according to any one of claims 10 to 15, wherein the dicarboxylic acid component is terephthalic acid and the glycol component is 50 to 85 mol% of ethylene glycol and 15 to 50 mol% of neopentyl glycol. Characterized by a long fiber nonwoven fabric. A method for producing the long fiber nonwoven fabric according to any one of claims 1 to 16,
Step A of discharging melted polyethylene terephthalate and co-polyester from a spinneret, cooling and solidifying them, and then pulling and drawing with an ejector to form long fibers of two-component conjugate spinning;
Step B of collecting the long fibers obtained in Step A to form a long fiber web;
Step C of pre-pressing the long fiber web;
Step D of subjecting the precompressed filament web to a crimping process
A method for producing a long fiber nonwoven fabric comprising a. The method for producing a long-fiber nonwoven fabric according to claim 17, wherein the step D is a step of immersing the long-fiber web in boiling water at 80°C or higher. The method for producing a filament nonwoven fabric according to claim 18, further comprising step E of transversely stretching the filament web after step D. The method for producing a filament nonwoven fabric according to claim 19, further comprising step F of calendering the filament web after step E. The method for producing a long-fiber nonwoven fabric according to claim 20, wherein the distance between the rolls in the calendering in step F is 0.1 mm or more. The method according to claim 17, wherein the step D is a step of crimping the filament web while gradually decreasing the speed ratio using two or more heating rollers whose temperature modulation and speed ratio can be changed. A method for producing a long fiber nonwoven fabric. The method according to any one of claims 17 to 22, wherein the step A uses an eccentric core-sheath nozzle as the spinneret to mix the polyethylene terephthalate as a core component and the co-polyester as a sheath component, A method for producing a long fiber nonwoven fabric characterized by comprising step A-1 of discharging from an eccentric core-sheath nozzle. The method according to any one of claims 17 to 23, wherein in the step A, the polyethylene terephthalate and the copolyester are side-by-side in the fiber length direction using a side-by-side nozzle as the spinneret. A method for producing a long-fiber nonwoven fabric comprising step A-2 of discharging from the side-by-side nozzle for bonding. The copolyester according to any one of claims 17 to 24, wherein the dicarboxylic acid component is terephthalic acid and the glycol component is 50 to 85 mol% of ethylene glycol and 15 to 50 mol% of neopentyl glycol. A method for producing a long fiber nonwoven fabric characterized by