JPH10310965A - Polyester short fiber nonwoven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a nonwoven fabric excellent in forming processability, suitable as a stretchable nonwoven fabric or a cushioning material having urethane-like soft touch, and resistant to deformation and yielding when used for a long time or under high temperature atmosphere. SOLUTION: This nonwoven fabric is produced by bonding, with a binder fiber, a conjugated fiber having fine crimps prepared by eccentrically bonding a polyethylene terephthalate or a polyester mainly composed of polyethylene terephthalate and a polyethylene terephthalate-based copolymer polyester which is prepared by copolymerizing isophthalic acid and ethylene oxide adduct of bisphenol A. The above binder fiber is composed of a core (polyethylene terephthalate)-sheath (a copolymer polyester having crystal melting point of >=100 deg.C, made of polyethylene terephthalate and/or polybutylene terephthalate and poly ε-caprolactone) conjugated polyester fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester short-fiber nonwoven fabric which has elasticity and urethane-like cushioning property and does not deform when used in a high-temperature atmosphere. The short fiber nonwoven fabric is suitably used for bedding, furniture cushion materials, seat cushion materials and the like.

[0002]

2. Description of the Related Art Conventionally, there has been known a technique in which short fibers having latent crimping ability are laminated and heated to develop a crimp to produce a stretchable nonwoven fabric (see, for example, JP-A-59-16).
8159, JP-A-3-269147). JP-A-4-100961 discloses a composite fiber of a copolymerized polyester mainly composed of ethylene terephthalate units obtained by copolymerizing a structural unit having a metal sulfonate group and polyethylene terephthalate, and has a spiral winding of 50 pieces / 25 mm or more. Urethane-like polyester solid cotton in which fibers exhibiting shrinkage are point-joined with binder fibers is disclosed.

[0003] Further, conventionally, mainly used polyester binder fibers are polyethylene terephthalate / polyester terephthalate.
An isophthalate copolymerized polyester is used as a binder component. This polyester is an amorphous polymer, does not show a clear crystalline melting point, and has a glass transition point (about 65 ° C).
Then, softening starts. Therefore, there is a disadvantage that when used in a high-temperature atmosphere, the adhesive strength is reduced and deformation occurs. The present inventors have proposed a polyester binder fiber which does not deform due to a decrease in adhesive strength when used in a high-temperature atmosphere. (PCT / JP
93/01890; Japanese Patent Application No. 515882/1994)

[0004]

SUMMARY OF THE INVENTION The present invention solves such a disadvantage that the conventional nonwoven fabric using a binder fiber is easily deformed when used in a high-temperature atmosphere. Excellent in heat-sealed elasticity, suitable for use as padding for furniture, beds, mattresses, cushions, mats, cushioning materials such as car / vehicle seat cushions, car flooring materials or trunk room interior materials. It is an object of the present invention to provide a nonwoven fabric or a nonwoven fabric having a urethane-like cushioning property.

[0005]

Means for Solving the Problems The present inventors have made intensive studies to develop such a new nonwoven fabric, and as a result, have reached the present invention. That is, the present invention provides 50 pieces / 2.5 cm
A polyester short fiber nonwoven fabric characterized in that the polyester fiber having the fine spiral crimp is point-joined with an aliphatic lactone copolymerized polyester binder fiber having a crystal melting point of 100 ° C. or higher. .

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
First, it is necessary that the polyester fiber as the main fiber constituting the nonwoven fabric of the present invention has a spiral crimp of 50 / 2.5 cm or more. This value is more than several times as large as the normal number of crimps, and many very fine crimps are expressed, which is called a fine crimped fiber. If this value is less than 50 / 2.5 cm, a nonwoven fabric with insufficient crimping and excellent stretchability or a nonwoven fabric having a urethane-like cushioning property cannot be obtained.

[0007] The polyester fiber having a spiral crimp constituting the nonwoven fabric of the present invention can be obtained by subjecting a conjugate fiber obtained by eccentrically joining two polyester components to heat treatment or the like. It is important to appropriately select the combination of the type of polyester component and the degree of polymerization. For example, polyethylene terephthalate is preferably used as polyester A constituting one of the composite fibers. On the other hand, the polyester B constituting the other of the conjugate fibers is mainly composed of an ethylene terephthalate unit, and a copolymer component such as isophthalic acid, 5-sulfoisophthalic acid, bisphenol A, diethylene glycol and polyethylene glycol is used alone or in combination of two or more. Those copolymerized at 2 to 20 mol% are preferably used. Fibers that have developed fine crimps at the stage of raw cotton have poor passability through a carding machine, so to obtain conjugate fibers suitable for the present invention, heat setting in a dryer after mechanical crimping with a crimper It is preferable to obtain fine crimped fibers by producing raw cotton by setting the temperature condition to less than 100 ° C., forming a web with a carding machine, and then heat-treating at 100 ° C. or more to make latent fine crimps visible. . The latent crimpability of the fiber can also be controlled by the heat setting conditions in the drawing step.

The polyester fiber having a spiral crimp may have a round or irregular cross section, or may be hollow or non-hollow. Further, the fineness is not particularly limited and may be determined according to the required characteristics depending on the application.
A denier of 00 is used. This fiber may be provided with a conventional oil agent for nonwoven fabrics or a particularly lubricious silicone or non-silicone oil. The proportion of the spirally crimped fiber in the nonwoven fabric of the present invention is suitably from 20 to 90% by weight, but can be changed according to the required characteristics depending on the application.

The polyester binder fiber, which is another component of the nonwoven fabric of the present invention, has, as a binder component, a copolymerized polyester obtained by copolymerizing an aromatic polyester and an aliphatic lactone and having a crystal melting point of 100 ° C. or higher. . As the aromatic polyester, a polymer of an ethylene terephthalate unit and / or a butylene terephthalate unit or isophthalic acid, 2,6
-Naphthalenedicarboxylic acid, adipic acid, sebacic acid,
It is obtained by copolymerizing diethylene glycol, 1,6-hexanediol, or the like, and the total amount of components to be copolymerized is preferably about 20 mol% or less based on the number of moles of the polyester component. Aliphatic lactones include carbon 4-1
There is a homopolymer or a copolymer of two or more lactones, and particularly preferred lactones include ε-caprolactone and δ-valerolactone. The copolymerization ratio of the aliphatic lactone is preferably about 3 mol% or more and less than 80 mol% in the case of ε-caprolactone. Also,
The ε-caprolactone unit in the polyester may be a random copolymer or a block copolymer with other constituent units. 3 mol% of ε-caprolactone units
If it is less than, the adhesive strength is insufficient and the nonwoven fabric is likely to be deformed when a load is applied. When the ε-caprolactone unit is at least 40 mol%, the obtained polyester will have elastomeric elasticity, and the surface of the obtained nonwoven fabric will have a unique and extremely soft texture. If the ε-caprolactone unit exceeds 80 mol%, the melting point of the obtained polyester becomes too low, which causes problems in the processing step and easily deforms when used in a high-temperature atmosphere.

The melting point of the polyester binder fiber is 10
The temperature is 0 ° C or higher, preferably 130 ° C or higher. Melting point is 10
If the temperature is lower than 0 ° C., it is not preferable because the film is easily deformed when used under a high-temperature atmosphere, for example, under a hot sun. The upper limit of the melting point is preferably lower than the melting point or decomposition point of the main fiber by 20 ° C. or more.

Further, the binder fiber used in the present invention comprises:
The shrinkage at 100 ° C. is preferably 3% or less.
When the shrinkage ratio at 100 ° C. exceeds 3%, particularly when the use ratio of the binder fiber is high, the nonwoven fabric after heat bonding may shrink when exposed to a high-temperature atmosphere, resulting in poor dimensional stability. In order to lower the shrinkage of the binder fiber, it is necessary to heat set the binder fiber in the drawing step at a temperature as low as possible below the crystal melting point of the binder fiber in the drawing step of the binder fiber. This is possible only when the melting component of the binder fiber shows a definite crystal melting point, and is not possible with a binder fiber that begins to soften at 65 ° C. or higher as in a conventional polyester binder fiber. Was.

As the polyester-based binder fiber,
Monocomponent fibers consisting only of a polyester binder component, and a core-sheath type, side-by-side type, sea-island type, split fiber type, or other composite fibers in which the polyester binder component forms all or part of the surface of the single fiber. Can be
Among them, the core-sheath type composite fiber having a core of polyethylene terephthalate and a sheath of a polyester binder component is preferable from the viewpoint of high adhesive strength, that is, shape retention when a nonwoven fabric is used and stiffness of the nonwoven fabric.

The fineness of the polyester binder fiber is not particularly limited, but 2 to 100 denier is suitable. The use ratio of the polyester-based binder fiber in the present invention is suitably 5 to 70% by weight of the whole,
It can be changed according to the required characteristics depending on the application.

The nonwoven fabric of the present invention may be not only a nonwoven fabric consisting of a fiber having a spiral crimp and a binder fiber but also a nonwoven fabric combining other fibers having a higher melting point or decomposition point than the binder fiber. Other fibers include
Synthetic fibers such as polyester fibers, nylon fibers, acrylic fibers, and polypropylene fibers; recycled fibers such as rayon fibers; and natural fibers such as wool, cotton, and hemp can be used. Among them, polyester fibers such as ethylene terephthalate unit, butylene butylene terephthalate unit or ethylene naphthalate, particularly ethylene-2,6-naphthalate unit, which is a main component, are preferable, but physical properties such as difficulty in deformation thereof and economical efficiency are preferable. In particular, polyethylene terephthalate fiber is preferable from the viewpoint of the above. It should be noted that a polyester obtained by copolymerizing other components such as isophthalic acid, 5-sulfoisophthalic acid, and diethylene glycol may be used as long as the properties are not impaired. The polyester fiber may have a round or irregular cross-section, and may be hollow or non-hollow. Further, the fineness is not particularly limited, and may be determined according to the required characteristics depending on the application. Generally, a fineness of 2 to 200 denier is used.
The form of crimping is not particularly limited, but when a nonwoven fabric is used as the cushioning material, a conjugate-type three-dimensional crimp is more preferable because a cushioning property can be obtained. The polyester fiber may be provided with a usual oiling agent for cotton filling or a particularly lubricating silicone-based or non-silicone-based oily lubricant.

The fibers are applied with an oil agent, mechanically crimped with a crimper or the like, and then drawn to tens of thousands to millions of deniers and cut to a predetermined length with a cutter such as an EC cutter or a glue cutter.

The nonwoven fabric of the present invention is obtained by crimping each fiber as a raw material to a thickness of 5 to 100 mm, preferably 20 to 8 mm.
After cutting to 0 mm, the cotton is mixed at a ratio determined by the application or the required characteristics, and a web is formed with a carding machine or the like. It can be obtained by manifesting the crimp. In this case, needling may be performed before the heat treatment.
As the heat treatment apparatus, a hot air circulation dryer, a hot air once-through dryer, a suction drum dryer, a Yankee drum dryer, or the like is used, and the processing may be performed by selecting a processing temperature and a processing time according to the melting point of the binder component.

Further, as a method for producing a cushion material having a certain thickness, there is a method in which a mixture of fibers as a raw material is blown into a predetermined side ground or a form by a blow molding machine to form the cushion material. The form of the side land and the form are appropriately selected depending on the use of the obtained molded product. In other words, heat treatment after blowing a mixture of fibers as a raw material into the side ground and the mold,
It is also possible to produce by crimping the latent crimped cotton contained in the mixture, and at the same time, fuse the binder fibers and perform point joining. When heating in a mold, it is efficient to use a so-called cushion type heat treatment machine in which hot air is blown in from one side and sucked in from the other side, since the heating time is reduced. Alternatively, the material may be heated in a mold and then formed into a predetermined shape by hot pressing or cold pressing.

When the nonwoven fabric of the present invention is used as a cushion material, the thickness is preferably 5 mm or more. Such a thick nonwoven fabric is usually referred to as solid cotton. The upper limit of the thickness is not particularly limited, but is preferably about 150 mm in terms of manufacturing equipment, manufacturing cost, and ease of use. The density of the cushion material is preferably 0.010 g / cm ³ or more.

In order to regulate the thickness and density of the nonwoven fabric of the present invention, the basis weight of the web before the heat treatment is appropriately selected in consideration of the area shrinkage of the web due to the heat treatment, and a thickness regulating roll is incorporated in the heat treatment apparatus. The web may be heat-treated by sandwiching a web between a plate or a wire mesh having a spacer of a predetermined thickness.

The heat treatment for imparting elasticity or urethane-like cushioning property to the nonwoven fabric of the present invention and integrating the same may be appropriately performed at a temperature of 100 ° C. or more and 230 ° C. or less. In these cases, other heat-fusible polyester binder fibers (for example, manufactured by Unitika, Melty <40
When 80>) is used in combination, a nonwoven fabric having strong tensile strength and peeling strength can be obtained.

[0021]

The fiber constituting the nonwoven fabric of the present invention has a fine spiral crimp and therefore has a soft feel. In addition, the nonwoven fabric obtained is point-joined by a polyester binder that is relatively soft, hard to thermally decompose, and is easy to heat weld. It is difficult to peel off the joint part probably because it is high. Therefore, the shape of the non-woven fabric is favorably maintained, and it is difficult to set. Further, since this binder component is a polymer having a melting point of 100 ° C. or higher, it is difficult to be deformed even when compressed under a high temperature atmosphere of, for example, about 70 to 80 ° C., and is hard to set when used.

[0022]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples. The methods for evaluating various physical properties described in the examples are as follows. (1) Relative viscosity Equal weight mixture of phenol and ethane tetrachloride as solvent,
The measurement was performed at a sample concentration of 0.5 g / dl and a temperature of 20 ° C. (2) Melting point The melting point was measured at a heating rate of 20 ° C./min using a differential scanning calorimeter DSC-2 manufactured by PerkinElmer. (3) Number of fine crimps Fine crimped fibers are extracted from the non-woven fabric (or solid cotton) after the heat treatment, and JIS L-1015 7.12.1
The number of crimps was measured by the method described above.

(4) Set resistance during repeated compression After measuring the thickness of the nonwoven fabric, a test piece (10 cm × 10 cm)
Was sandwiched between parallel plane plates, and a total of 50,000 repetitive compression tests were conducted at a load of 15 kg at 60 times per minute. The thickness of the test piece after the test was measured, and the bulkiness retention C (%) was calculated by the following equation.
Was calculated and used as a measure of difficulty in setting. The larger the value of C, the more difficult it is to set.

[0024]

(Equation 1)

(5) Set resistance under high-temperature atmosphere After measuring the thickness of the nonwoven fabric, a test piece (10 cm × 10 cm)
Is placed in a parallel flat plate, compressed and fixed to 50% of the original thickness, placed in a constant temperature bath at a temperature of 70 ° C., left for 6 hours, taken out, removed from the parallel flat plate and left at room temperature for 30 minutes, Measure its thickness. The bulk retention Cp (%) under a high-temperature atmosphere was calculated by the following equation and used as a measure of sag resistance.

[0026]

(Equation 2)

(6) Hand The hand of the heat-treated nonwoven fabric was evaluated in the following three stages by a sensory test by 10 panelists. 1: Soft 2: Normal 3: Hard

Example 1 A polyethylene terephthalate copolymer polyester having a relative viscosity of 1.45 and a copolymer of 4 mol% of polyethylene terephthalate and isophthalic acid having a relative viscosity of 1.38 and 3 mol% of an adduct of ethylene oxide of bisphenol A with 2 mol was used. After drying the two kinds of chips under reduced pressure, they are melted using an ordinary compound melt spinning apparatus, and the two kinds of components are compounded side by side (weight ratio: 1: 1). The composite melt spinning was performed at an amount of 920 g / min. After cooling the spun yarn, the yarn was drawn at a take-up speed of 1000 m / min to obtain an undrawn yarn. The obtained yarn was converged to a 100,000 denier tow, and the draw ratio was 3.4 times.
The film was stretched at a stretching temperature of 75 ° C., heat-treated with a heat drum at 140 ° C., mechanically crimped with a crimper, dried at 70 ° C., and cut into 51 mm. The resulting fiber was a latently crimpable fiber having a single yarn fineness of 10.3 denier and a mechanical crimp number of 9/25 mm. In addition, ethylene terephthalate units /
Random copolymerization as a binder component obtained by blending 20 mol% of butylene terephthalate unit (molar ratio 1/1) and ε-CL with respect to the total number of moles of this alkylene terephthalate unit and ε-caprolactone (ε-CL). Polyester chip (relative viscosity 1.34, melting point 144 ° C)
And polyethylene terephthalate having a relative viscosity of 1.38 (P
After the chip of ET) was dried under reduced pressure, it was melted using a conventional composite melt spinning apparatus, and a random copolymerized polyester was disposed on a sheath and PET was disposed on a core.
The composite melt spinning was performed at a spinning temperature of 280 ° C. and a total discharge amount of 313 g / min. After cooling the spun yarn, it was drawn at a take-up speed of 1000 m / min to obtain an undrawn fiber yarn.
The obtained yarn is bundled and made into a 100,000 denier tow.
The film is stretched at a stretching ratio of 2.9 and a stretching temperature of 60 ° C., heat-treated with a heat drum at 120 ° C., crimped using a push-in type crimper, and cut into a length of 51 mm. A 4-denier core-sheath composite polyester binder fiber was obtained. The above-mentioned polyester-based binder fiber is mixed with a weight ratio of 20% to 80% of the latent crimpable fiber, passed through a carding machine, and then laminated with a cross wrapper to obtain a web having a basis weight of 600 g / m ² , and a barb. Needling was performed at a needle density of 240 needles / cm ² through a needle locker room having a needle with a needle. . In addition, put this web between the wire mesh with a spacer of 20mm thickness,
While regulating the thickness, a heat treatment was performed for 10 minutes in a hot air circulating dryer at 180 ° C. to obtain a nonwoven fabric (solid cotton) of Example 1 having a thickness of 20 mm. The number of crimps of the fine crimped fibers constituting the hard cotton was 68/25 mm. As a result of evaluating the cushioning property by stacking three pieces of this cotton, C = 96%, Cp =
It was 93%, which proved that the sag resistance during repeated compression and in a high-temperature atmosphere was good. In addition, the evaluation of the hand was 1, which was soft and good.

Example 2 After drying two kinds of chips of polyethylene terephthalate having a relative viscosity of 1.38 and polyethylene terephthalate having a relative viscosity of 1.29 under reduced pressure, the chips were melted using an ordinary hollow composite melt spinning apparatus, and the two chips were melted. The components are compounded side by side (weight ratio 1: 1) so that the spinning temperature is 285 ° C.
Composite melt spinning was performed at a total discharge rate of 1200 g / min. After cooling the spun yarn, the yarn was drawn at a take-up speed of 1000 m / min to obtain an undrawn yarn. The obtained yarn was converged to a 100,000-denier tow, and a draw ratio of 3.4 times and a draw temperature of 7 were obtained.
The film was stretched at 5 ° C., dried at 170 ° C., and cut into 51 mm. The obtained fiber was a bulky hollow composite fiber having a single yarn fineness of 13.5 denier and a number of crimps of 10/25 mm. Solid cotton was obtained in the same manner as in Example 1 except that the cotton was mixed in a weight ratio of 50% of the latently crimpable fiber obtained in Example 1, 15% of the polyester-based binder fiber, and 35% of the hollow composite fiber. .

Example 3 In Example 2, the copolyester chips used for the latently crimpable fibers had a relative viscosity of 1.46 obtained by copolymerizing 5 mol% of isophthalic acid and 5 mol% of an ethylene oxide adduct of bisphenol A. Was carried out in the same manner as in Example 2 except that

Example 4 In Example 2, a copolyester chip used for latently crimpable fibers having a relative viscosity of 1.28 obtained by copolymerizing 5-sulfoisophthalic acid at 5 mol% was used.
The procedure was performed in the same manner as in Example 1 except that the stretching ratio was 85 g and the stretching ratio was 2.9 times. The resulting latently crimpable fiber had a mechanical crimp count of 11 pieces / 25 mm. The obtained solid cotton had a soft texture.

Comparative Example 1 In Example 2, the copolymerized polyester chips used for the latently crimpable fibers had a relative viscosity of 1.33 obtained by copolymerizing 1 mol% each of ethylene oxide 2 mol adduct of isophthalic acid and bisphenol A. Was carried out in the same manner as in Example 2 except that The resulting latently crimpable fiber had a mechanical crimp count of 10/25 mm, and the fine crimped fiber constituting the obtained solid cotton had a crimp count of 33/25 mm. The hard cotton did not have the urethane-like texture peculiar to fine crimped cotton, and had almost the same texture as ordinary cotton.

Example 5 In Example 2, ε-CL was blended in an amount of 20 mol% based on the total number of moles of polybutylene terephthalate (PBT) and ε-CL as a random copolymerized polyester chip used for the polyester-based binder fiber. Example 2 was repeated except that the obtained random copolymerized polyester chip (relative viscosity 1.34, melting point 182 ° C) was used as the binder component, the heat drum heat treatment was 130 ° C, and the temperature during the heat treatment of the solid cotton was 190 ° C. In the same manner as in the above, solid cotton of Example 5 was obtained. The obtained solid cotton had a soft texture.

Example 6 In Example 2, PET was used as the random copolymerized polyester chip used for the polyester-based binder fiber.
And a random copolymerized polyester chip obtained by blending 28 mol% of ε-CL with respect to the total number of moles of ε-CL (relative viscosity
(1.42, melting point: 196 ° C.), and a solid cotton of Example 6 was obtained in the same manner as in Example 2 except that the heat drum heat treatment was 150 ° C. and the mini-futon heat treatment temperature was 210 ° C. Despite the high heat treatment temperature, no thermal decomposition of the polyester binder component was observed. The obtained solid cotton had a soft texture.

Example 7 In Example 2, the random copolymerized polyester chip used for the polyester-based binder fiber was PET.
And a random copolymerized polyester elastomer chip (relative viscosity 1.82, melting point 183 ° C) obtained by blending 60 mol% of ε-CL with respect to the total number of moles of ε-CL. A solid cotton of Example 7 was obtained in the same manner as in Example 2, except that the heat treatment temperature of the cotton was 190 ° C. Despite the high heat treatment temperature, no thermal decomposition of the polyester elastomer component was observed. The obtained solid cotton had a soft texture.

Example 8 In Example 2, PBT was used as the random copolymerized polyester chip used for the polyester binder fiber.
And a random copolymerized polyester elastomer chip (relative viscosity: 1.95, melting point: 160 ° C.) obtained by blending 62 mol% of ε-CL with respect to the total number of moles of ε-CL. Solid cotton of Example 8 was obtained in the same manner as in Example 2, except that the heat treatment temperature of the cotton was set to 180 ° C. The obtained solid cotton had a soft texture.

Example 9 In Example 2, PBT was used as the random copolymerized polyester chip used for the polyester binder fiber.
To a random copolymerized polyester elastomer chip (relative viscosity of 2.05,
(Melting point: 133 ° C.)
Except that the heat treatment temperature of the mini-futon was set to 150 ° C., a ball-shaped cotton aggregate of Example 9 was obtained in the same manner as in Example 2. The obtained ball-shaped cotton aggregate had a soft texture.

Example 10 In Example 2, PBT was used as the random copolymerized polyester chip used for the polyester-based binder fiber.
To a random copolymerized polyester elastomer chip (relative viscosity of 2.08,
(Melting point 180 ° C) and heat drum heat treatment for 120
C., and a solid cotton of Example 10 was obtained in the same manner as in Example 2, except that the heat treatment temperature of the solid cotton was set to 200.degree. The obtained solid cotton had a soft texture.

Example 11 In Example 2, an aromatic polyester 90 copolymerized with terephthalic acid / ethylene glycol / 1,4-butanediol = 100/50/50 was used as the random copolymerized polyester chip used for the polyester-based binder fiber. Random copolymerized polyester chips obtained by copolymerizing mol% and 10 mol% of δ-valerolactone (melting point: 160 ° C.)
The solid cotton of Example 11 was obtained in the same manner as in Example 2 except for using. The obtained solid cotton had a soft texture.

Comparative Example 2 In Example 2, 28 mol% of ethylene terephthalate unit / butylene terephthalate unit (molar ratio 6/4) and 72 mol% of ε-CL were blended as random copolymerized polyester chips used for polyester-based binder fibers. (Relative viscosity)
1.92, melting point 94 ° C.), and the heat treatment was carried out with a heat drum at 60 ° C. instead of the heat treatment with a heat drum at 140 ° C. after stretching. Although a considerable amount of adhesion between the drawing roller and the fibers was observed, a small amount of the sample was obtained. Example 2 except that this was used as a binder fiber and the heat treatment temperature of the solid cotton was changed to 180 ° C. and set to 120 ° C.
In the same manner as in Example 1, solid cotton of Comparative Example 2 was obtained.

Comparative Example 3 In Example 2, as a random copolymerized polyester chip used for the polyester-based binder fiber, a polyester chip composed of ethylene terephthalate units / ethylene isophthalate units (molar ratio: 6/4) (relative viscosity: 1.37; Melting point by DSC was not recognized and visual softening point of 110 ° C) was used, and the heat treatment was carried out without heat treatment in place of heat treatment at 140 ° C after stretching. Example 2 was repeated except that this was used as a binder fiber and the heat treatment temperature of the solid cotton was changed to 180 ° C and set to 150 ° C.
In the same manner as in Example 1, solid cotton of Comparative Example 3 was obtained. Table 1 shows the evaluation results of the feeling and sag resistance of the solid cotton of Examples 2 to 10 and Comparative Examples 1 to 3.

[0042]

[Table 1]

As is clear from Table 1, Examples 2 to 11
Each of the solid cottons had good feeling and sag resistance, but the solid cotton of Comparative Example 2 was easily sagged in a high-temperature atmosphere because the melting point of the polyester elastomer as an adhesive component was low. Was. In addition, the solid cotton of Comparative Example 3 had a firm feel and was easy to be sagged under a high-temperature atmosphere.

[0044]

As described above, the nonwoven fabric of the present invention can be made into a nonwoven fabric having a soft feel and elasticity, or a hard cotton which provides a cushioning property of urethane-like. In addition, it is hard to set against repeated compression or compression in a high temperature atmosphere. Therefore, the nonwoven fabric of the present invention is suitable for furniture cushion materials and seat cushion materials.

Claims (2)

[Claims] 1. A polyester, wherein polyester fibers having a fine spiral crimp of 50 / 2.5 cm or more are point-joined with an aliphatic lactone copolymerized polyester-based binder fiber having a crystal melting point of 100 ° C. or more. Short fiber non-woven fabric. 2. A polyester fiber having a fine spiral crimp of 50 cm / 2.5 cm or more, wherein a polyethylene terephthalate or a polyethylene terephthalate-based copolymer obtained by copolymerizing a polyester based on the same with an ethylene oxide adduct of isophthalic acid and bisphenol A is used. The polyester short fiber nonwoven fabric according to claim 1, wherein the nonwoven fabric is a composite fiber eccentrically bonded to the polymerized polyester.