JPH09105055A - Production of polyester-based elastic hard fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain polyester-based elastic hard fibers suitable as a sanitary material, etc., excellent in blowing workability, moldability and uniformity, having elastic performance by development of spiral crimp, by heat-treating specific thermally bondable fibers and prescribed main fibers under a specific condition. SOLUTION: Thermally bondable fibers which are obtained by eccentrically arranging a polyalkylene terephthalate having >=220 deg.C melting point as a core component 2 and a copolyester copolymerized with isophthalic acid as a sheath component 1 and subjecting the components to sheath-core conjugate spinning and are provided with 5-10 crimps/25 mm and main fibers which are obtained by subjecting a copolyester 3 consisting essentially of a polyethylene terephthalate unit prepared by copolymerizing isophthalic acid with an adduct of ethylene oxide to bisphenol A and a polyalkylene terephthalate 4 having >=220 deg.C melting point and develop spiral crimp are used in the ratio of 60/40-90/10 and formed into ball-like fibers, which are blown into a side part and heat-treated at a temperature equal to or higher than the softening temperature of the copolyester arranged at the sheath of the thermally bondable fibers to give the objective polyester-based elastic hard fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cotton, bedding,
The present invention relates to a method for producing an elastic cotton containing a polyester-based composite fiber having excellent moldability, which is used in the fields of sofas, cushions, automobile interior materials and the like.

[0002]

2. Description of the Related Art Conventionally, short polyester fibers have been widely used as stuffed cotton for sanitary materials such as cotton, bedding, sofas, cushions and interior materials for automobiles by utilizing their excellent characteristics. A well-known method is to mix cotton and open it once with a card machine, and then heat-bond the main cotton with a heat treatment machine to put it on the side fabric and commercialize it. This method is suitable for mats composed of simple laterals, and complicated laterals are difficult to insert or use a card machine, resulting in cost savings in terms of labor saving. There was a problem.

As a method of solving such a problem, a method of using beaded cotton in place of the opened short fibers has been proposed. For example, Japanese Patent Laid-Open No. 61-12537 discloses a method of containing binder fibers. A method is disclosed in which the ball-shaped cotton is blown into the side material and then heat-treated to be integrated. However, this method has a problem in durability because the entanglement of fibers between the cotton balls is weak.

Polyester fibers, which are relatively inexpensive and have excellent physical properties, are most often used as the main cotton. However, these main cotton are bedding, sofa,
As a stuffed cotton for cushions, automobile interior materials, etc., it is inferior in elasticity as compared with urethane foam, and it has not been possible to obtain a soft cotton having sufficient soft performance for use in cotton as a sanitary material.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems and provides a method for producing cotton wool which has good blowing workability, excellent uniformity and moldability, and excellent elasticity. It is a specific subject.

[0006]

Means for Solving the Problems As a result of intensive research to solve the above problems, the inventors have arranged a polyester having a low softening point component as a sheath component and a polyalkylene terephthalate as a core component, and have a core component. The eccentric composite fiber that has a high spiral crimp expression ability by eccentrically arranging the sheath component and the sheath component is used as a heat-bonding cotton, and a specific copolyester and polyalkylene terephthalate are spun to produce a high spiral crimp expression ability. After forming beaded cotton with the composite fiber as the main cotton, this beaded cotton is blown to the lateral side,
We have found that this problem can be achieved by heat treatment and have reached the present invention.

That is, according to the present invention, when a solid cotton consisting of heat-bonded cotton and main cotton is produced, the core component has a melting point of 2
A polyalkylene terephthalate having a temperature of 20 ° C. or higher is placed, and the molar ratio of terephthalic acid to isophthalic acid as a sheath component is 8
5:15 to 60:40, a copolymerized polyester copolymerized with ethylene glycol and having a softening point of 110 to 215 ° C. is arranged, the core component and the sheath component are eccentric, and the core-sheath ratio is 40:60 to 80: An eccentric core having a latent crimping capacity of generating spiral crimps of 30 pieces / 25 mm or more when freely shrunk at 90 ° C. for 10 minutes and having a mechanical crimp number of 5 to 10 pieces / 25 mm. Polyester terephthalate having a melting point of 220 ° C. or higher and a polyethylene terephthalate unit-based copolymerized polyester obtained by copolymerizing 2 to 10 mol% of isophthalic acid and 1 to 10 mol% of an ethylene oxide adduct of bisphenol A with a sheath composite fiber as a heat-bonded cotton. And a latent crimping ability to develop a spiral crimp of 30 pieces / 25 mm or more when freely shrinking at 160 ° C. for 10 minutes. Pieces / as 25mm mainly cotton composite fiber mechanical crimping is granted, thermal bonding cotton and the principal cotton 10: 90-40: diameter 3~20mm using 60 ratio of
The method for producing a polyester-based elastic cotton, which is characterized in that after the beaded cotton is blown into the side fabric by air blowing and heat-treated at a temperature equal to or higher than the softening temperature of the sheath component of the heat-bonded cotton. It is a summary.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
First, the number of fibers used as the heat-bonded cotton in the present invention is 2
It is an eccentric core-sheath composite fiber obtained by composite spinning of various types of polyester as an eccentric core-sheath structure. The core component has a melting point of 220.
C. or higher polyethylene terephthalate (hereinafter abbreviated as PET), polybutylene terephthalate (hereinafter P
Abbreviated as BT. ) And other polyalkylene terephthalates are used. The intrinsic viscosity [η] of PET is 0.45 to 0.
It is preferably 75. A small amount (about 10 mol% or less) of a copolymerization component such as adipic acid, sebacic acid, 1,4-butanediol, 1,6-hexanediol, diethylene glycol or polyethylene glycol is contained within a range not impairing the object of the present invention. Alternatively, it may be one to which an additive such as a matting agent or a lubricant is added. The melting point of the core component is set to 220 ° C. or higher in order to stabilize the spinnability and prevent thermal contraction during the fusion heat treatment.

The sheath component of the heat-bonded cotton has a softening point of 110-2 when it is copolymerized with ethylene glycol with a molar ratio of terephthalic acid and isophthalic acid of 85: 15-60: 40.
A copolyester having a temperature of 15 ° C. is used. [Η] of this copolyester is preferably 0.45 to 0.60. If the copolymerization ratio of isophthalic acid is less than 15 mol%, the adhesive strength will be insufficient and the softening temperature will be high, so it is necessary to increase the heat treatment. On the other hand, if it exceeds 40 mol%, the softening temperature becomes too low, and there is a risk that the shape may change due to re-adhesion during the use of cotton, and the spinnability is extremely poor in fiber production and it is suitable for production. It's gone. In the production of heat-bonded cotton, since the sheath component is composed of a polymer with a low softening temperature, the single yarns may fuse together during heat treatment, so heat setting or heat treatment is not performed after stretching the undrawn yarn. Is preferred.

The composite form of the heat-bonded cotton is not particularly limited as long as the core component and the sheath component are eccentrically arranged in a form having a latent crimping ability and spun, but a part of the core component is exposed on the surface. 1A, the sheath component 1 covers the entire surface of the core component 2 as shown in FIG.

The core-sheath composite ratio of the heat-bonded cotton is 40:60 to.
The ratio should be 80:20. Ratio of core component is 8
If it exceeds 0%, the adhesive component decreases and the adhesive strength decreases, and even if it is eccentric, the latent crimping ability is not sufficiently obtained. On the other hand, when the proportion of the sheath component exceeds 60%, yarn breakage frequently occurs during spinning, resulting in extremely poor operability, and the obtained cotton also has a hard texture because the movement of the main cotton is suppressed.

Further, the heat-bonded cotton develops crimps when it is heat-treated, and when it is subjected to free-shrink heat treatment at 90 ° C. for 10 minutes so that the cotton has excellent elastic recovery and sag resistance,
It is necessary to have a latent crimping ability capable of expressing 0 or 25 mm or more of fuperal crimps.

Further, the application of mechanical crimp to the heat-bonded cotton is
For example, a stuffing box or a heating gear is used, and the number of mechanical crimps needs to be 5 to 10/25 mm. If the number of crimps is less than 5 pieces / 25 mm, the entanglement with the main cotton is not sufficiently performed, and it becomes difficult to obtain ball-shaped cotton.
Further, if the number exceeds 10/25 mm, the entanglement between the fibers becomes too strong and the fibers become rod-shaped and the cotton ball cannot be obtained.

The single yarn fineness of the heat-bonded cotton is preferably 1.5 to 10 denier. If it is less than 1.5 denier,
Since the absolute amount of sheath component necessary for bonding cotton is insufficient, the fibers do not bond well and cotton cannot be obtained. On the other hand, when it exceeds 10 denier, the single yarn denier is too thick and the entanglement of the fibers is bad, so that it becomes difficult to obtain a ball-shaped cotton, and there is a possibility that the moldability and the uniformity after blowing into the side fabric are deteriorated. .

The fiber used as the main cotton in the present invention is a polyethylene terephthalate unit-based copolymerized polyester obtained by copolymerizing 2 to 10 mol% of isophthalic acid and 1 to 10 mol% of an ethylene oxide adduct of bisphenol A, and a melting point of 220 ° C. or higher. When the polyalkylene terephthalate of (1) is subjected to composite spinning and free shrinkage is performed at 160 ° C. for 10 minutes, it has a latent crimping ability to develop a spiral crimp of 30 pieces / 25 mm or more, and a mechanical crimp of 8 to 20 pieces / 25 mm is obtained. It is the added composite fiber. The polyalkylene terephthalate having a melting point of 220 ° C. or higher, which is one component of the composite fiber, is the same as that used for the heat-bonding fiber, and may be the same or different. As this component, one having an intrinsic viscosity of 0.45 to 0.70 is suitable.

The other component, the copolyester, is composed mainly of ethylene terephthalate units, 2 to 10 mol% of isophthalic acid and an ethylene oxide adduct of bisphenol A (hereinafter abbreviated as BAEO) 1 to 10.
It is a copolymer of mol%. If the isophthalic acid content is less than 2 mol% or the BAEO content is less than 1 mol%, the crimping ability is insufficient, and if either of them exceeds 10 mol%, the melting point is too low, and the useful fiber strength is high. May not be obtained, or the elastic recovery of cotton may be insufficient.
The copolymerized polyester as this component has an intrinsic viscosity of 0.
50 to 0.75 is suitable, and BAEO is preferably bisphenol A to which 2 to 10 mol of ethylene oxide is added.

The composite form of the main cotton is not particularly limited as long as it is spun into a form having latent crimps, but it is a side-by-side type, an eccentric sheath type, or the like. The side-by-side type as in B) is preferable because the crimp developing ability is excellent.

The composite ratio of the main cotton is 40:60 to 60:
The ratio is preferably 40, and is preferably 50:50 because the crimp-developing ability is excellent.

The main cotton develops crimps when heat treated,
3 when subjected to free shrink heat treatment at 160 ° C for 10 minutes so as to bring excellent elasticity recovery and sag resistance to cotton.
It is necessary to have a latent crimping ability capable of expressing spiral crimps of 0 pieces / 25 mm or more, preferably 40 pieces / 25 mm or more.

At the time of manufacture, for example, 5 to 20 pieces / 25 using a stuffing box or a heating gear.
It is necessary to add a mechanical crimp of mm. By matching the crimp number and the level of the heat-bonded cotton,
This is to obtain beaded cotton that is a uniform blend of heat-bonded cotton. If the number of crimps is too small, the fibers are not easily entangled with each other, making it difficult to form beaded cotton. Since the amount of cotton becomes small and heat treatment is repeated after heat treatment, it causes fatigue. If the number of crimps is too large, the fibers are strongly entangled with each other, the blending with the heat-bonded cotton is poor, and the ball-shaped cotton is not obtained and it becomes a rod-shaped cotton that is not even when blown to the side. Will end up.

The single yarn fineness of the main cotton is preferably 3 denier or more, more preferably 6 to 20 denier. If the fineness is too small, the cotton will not have hardness, and will have a feeling of bottoming, and will easily get flattened. On the other hand, if it is too large, the crimp expression ability will be poor and the entanglement with the heat-bonded cotton will be bad, resulting in a ball It hardly becomes cotton, the moldability and uniformity after blown into the side are deteriorated, and the elasticity of the solid cotton becomes poor.

The main cotton is a matting agent, a gloss improving agent, an antistatic agent,
A flame retardant, a softening / smoothing agent, etc. may be contained, and the cross-sectional shape is not limited to a circular shape, and may be a triangular cross-section or another irregular cross-section. Further, a smooth oil agent is preferable as a finishing oil agent to be given to the main cotton, and a silicone oil agent having water repellency is preferable as a padding material for bedding, sofa, cushion, automobile interior material, etc. In the above, a water-absorbing nonionic water-soluble oil agent (for example, polyalkylene glycol-modified polyester) is preferable.

The fiber length of the heat-bonded cotton and the main cotton in the present invention is preferably 15 to 60 mm. This length is 60
If it exceeds mm, it tends to be wrinkled in the lengthwise direction when trying to obtain a cotton ball, and the formability and uniformity after blowing into the side fabric may be deteriorated. Also, if it is less than 15 mm, the fiber length is too short and the entanglement with the main cotton becomes poor, and it becomes difficult to form ball-shaped cotton, the formability and uniformity of the hard cotton after heat treatment are poor, and when the hard cotton is repeatedly used. It may become hard cotton that is easy to set.

In the present invention, a rear beaded cotton is formed by using the above-mentioned heat-bonded cotton and main cotton, and the beaded cotton is blown into the side material formed into the shape of the product by air blowing, and thereafter, It is heat-treated to obtain a product, cotton wool.

The use ratio of the heat-bonded cotton and the main cotton is 10: 9.
It is necessary to set the ratio in the range of 0 to 40:60, and if the use ratio of the heat-bonded cotton is less than 10%, the amount of adhesive for molding the hard cotton will be insufficient and hard cotton cannot be obtained. Use ratio of heat-bonded cotton is 40%
If it exceeds, the heat shrinkage rate of heat treated cotton will be high, and it will not be possible to obtain cotton of the size according to the pattern of the side fabric, or it will become cotton with no elasticity.

The ball-shaped cotton can be obtained by stirring the heat-bonded cotton and the main cotton under a high-speed air stream. And its size is required to have a diameter of 3 to 20 mm. If the size of the ball-shaped cotton is too small, it becomes a nep shape and the cushioning property becomes poor, and if it is too large, the workability of blowing into the side fabric and the formability and uniformity after blowing deteriorate. The size of the ball-shaped cotton can be adjusted by adjusting the strength of the air flow and the treatment time, and by stirring under a high-speed air flow with a wind speed of 10 to 50 m / sec for 2 to 20 minutes, the size of the desired size can be adjusted. You can get things.

Heat treatment is performed to temporarily bond the constituent fibers so that the fibers do not separate during the process of making the cotton wool such as during blowing of the beaded cotton to the side, and the fibers are fused to each other. You can leave it.

The heat treatment temperature after the beaded cotton is sucked into the side fabric by air blowing is required to be a temperature higher than the melting point of the sheath component of the heat-bonded cotton. If the heat treatment is performed at a temperature lower than the melting point of the sheath component of the heat-bonded cotton, the adhesive force of the heat-bonded cotton cannot be sufficiently exhibited. The softening temperature of the sheath component of the heat-bonded cotton having a copolymerization ratio of isophthalic acid used in the present invention of 15 to 40 mol% is about 110 to 215 ° C., and it depends on the copolymerization ratio of isophthalic acid used for the sheath component. Heat bonding should be set.

[0029]

According to the present invention, an eccentric core-sheath composite fiber having a sheath component having excellent adhesiveness and having a latent crimping ability is used as a heat-bonding cotton, and a composite having a latent crimping ability exhibiting excellent crimping characteristics is obtained. Using the fiber as the main cotton, both of the same number of crimps are disturbed in a high-speed air current to form ball-shaped cotton, which is blown into a side material having a desired shape, and the temperature is higher than the melting point of the sheath component of the heat-bonded cotton. The heat-bonded cotton and the main cotton are evenly mixed and molded into the desired shape, and the constituent cotton develops spiral crimp to exhibit excellent cushioning properties and elastic elastic with excellent durability. It can be cotton.

[0030]

Next, the present invention will be described in detail with reference to examples. The method of measuring the characteristic values and the like in the examples is as follows.

(1) Intrinsic viscosity [η] 20 ° C. in a mixed solvent of equal weight of phenol and ethane tetrachloride
Measured with

(2) Melting point: Measured at a temperature rising rate of 20 ° C./min using a differential scanning calorimeter DSC-7 type manufactured by Perkin Elmer.

(3) Softening temperature Measured using an automatic softening point measuring device AMP-2 type manufactured by Yanagimoto Seisakusho Co., Ltd. at a heating rate of 1 ° C./min.

(4) Fineness Measured by the method of JIS L-105-7-5-1A.

(5) Number of crimps Measured by the method of JIS L-105-12-1.

(6) Repeated compressive residual strain rate Cotton wool is cut into a size of 300 × 300 × 50 mm and JIS K-64
Measured by the method of 01-5-3.

(7) Diameter of ball-shaped cotton Measured with calipers (8) Formability of ball-shaped cotton Observing the state of ball-shaped cotton formation during ball-shaped cotton production, ○: Stable ball-shaped formation △: The bead formation is unstable.
X: No bead is formed. Was evaluated in three steps.

(9) Block-shaped The obtained 200 g cotton wool was pulled up and down from the middle, and the block-shaped lumps having a size of 5 mm or more were counted. Δ: 2 to 5 pieces. X: 6
The evaluation was made in three grades of one or more.

Example 1 Polyethylene terephthalate-based copolyester having an intrinsic viscosity of 0.53 copolymerized with PET having a core component of [η] = 0.68 and a melting point of 256 ° C. and 20 mol% of isophthalic acid (IPA) as a sheath component (softening temperature 200 ℃) in a composite spinning machine with a core-sheath composite ratio of 50:50, and spinning temperature of an eccentric core-sheath structure type composite fiber in which core components are eccentrically present as shown in FIG. 1 (A).
℃, spinneret hole number 139 holes, take-up speed 1000m / min, discharge rate 216g / min, spun into a bundle and stretched 3.5 times between the 50 ° C feeding roller and the 60 ° C stretching roller, A drawn bundle of 400,000 denier was introduced, and subsequently introduced into a stuffing box to be mechanically crimped, and then an aqueous emulsion containing a nonionic water-soluble finishing oil at a concentration of 1% was applied,
After drying at 60 ° C for 10 minutes, it was cut into 32 mm by a cutter to obtain a heat-bonded cotton having a crimp number of 6/25 mm and a fineness of 4 denier. When this heat-bonded cotton was subjected to free heat treatment at 90 ° C. for 10 minutes, the number of crimps was 41.7 / 25 mm, and the crimped form was a neat spiral shape.

On the other hand, a polyethylene terephthalate-based copolyester of [η] = 0.72 and a polyethylene terephthalate of [η] = 0.69 obtained by copolymerizing 5.0 mol% of isophthalic acid and 3 mol% of BAEO added with 2 mol of ethylene oxide were used. Figure 1 with a spinning machine composite ratio of 50:50
Spinning temperature of side-by-side type composite fiber such as (B)
290 ℃, 139 spinneret holes, take-up speed 1000m / min,
It was spun at a discharge rate of 386 g / min, bundled into a bundle, and stretched 2.5 times on an intermittent basis between a feeding roll at 50 ° C and a stretching roll at 90 ° C.
After heat-treating through a heat-treating roll at 40 ° C to form a 600,000 denier stretched bundle, which is then introduced into a stuffing box to impart mechanical crimping, and then a nonionic water-soluble finishing oil (polyalkylene glycol-modified polyester) Then, an aqueous emulsion having a concentration of 1% was applied, dried at 60 ° C. for 10 minutes, and cut into 32 mm with a cutter to obtain a main cotton having a crimp number of 11 pieces / 25 mm and a fineness of 10 denier. This main cotton is 160 ℃
Number of crimps after free shrink heat treatment for 10 minutes at 42.7 / 25
In mm, the crimped form had a clean spiral shape.

400 g of the obtained heat-bonded cotton and 600 g of the main cotton (the ratio of the heat-bonded cotton and the main cotton is 40:60) are put into a cotton processing machine, and the mixture is stirred for 10 minutes under a high-speed air stream with an air pressure of 250 mmAq and a wind speed of 40 / sec. A ball-shaped cotton with a diameter of 10 mm was obtained.

The ball-shaped cotton obtained was 400 × at a wind speed of 20 m / sec.
After blowing on the side of the rectangular body of the stainless steel wire mesh of 400 × 50 mm and made of Teflon, 220
Heat treatment was performed at 30 ° C. for 30 minutes to obtain a cotton wool according to the present invention.

Example 2 In Example 1, the number of mechanical crimps was changed to 11/25 mm to 9
The number of mechanical crimps is 6/25 by using the main cotton of the number of 25 / mm and the copolyester of which the ratio of the IPA copolymer is 40 mol% instead of 20 mol% (softening temperature 110 ° C).
3 pieces / 25 mm of heat-bonded cotton was used instead of mm, and the processing time was changed from 10 minutes to 7 minutes and the heat treatment temperature was set to 220
Cotton wool according to the present invention was obtained in the same manner as in Example 1 except that the temperature was changed to 150 ° C.

Example 3 In Example 1, the number of mechanical crimps was changed to 11/25 mm to 15
The number of mechanical crimps is 6 pieces / 25 using the main cotton of 20 pieces / 25 mm and the copolymerized polyester (softening temperature 215 ° C.) in which the proportion of IPA is changed from 20 mole% to 15 mole% as the sheath component.
10 pieces / 25 mm of heat-adhesive cotton was used instead of mm, and the cotton processing time was changed to 10 minutes to 3 minutes and the heat treatment temperature was set to 220
Cotton wool according to the present invention was obtained in the same manner as in Example 1 except that the temperature was changed to 235 ° C.

Example 4 Copolymerized polyester obtained in Example 1 except that the proportion of IPA copolymerized as a sheath component was changed to 20 mol% to 40 mol%.
A cotton wool according to the present invention was obtained in the same manner as in Example 1 except that a heat-bonding cotton having a softening temperature of 110 ° C. was used and the heat treatment temperature was changed to 220 ° C. to 150 ° C.

Example 5 In Example 1, the ratio of the heat-bonded cotton to the main cotton was changed to 40:60 to 10:90, and the fiber lengths of the heat-bonded cotton and the main cotton were changed.
A cotton wool according to the present invention was obtained in the same manner as in Example 1 except that the length was changed from 32 mm to 15 mm, and the cotton wool processing time was changed from 10 minutes to 3 minutes.

Example 6 In Example 1, the core-sheath composite ratio was changed from 50:50 to 40:40.
The heat-bonded cotton used as 60 was used, the fiber length of the heat-bonded cotton and the main cotton was changed from 32 mm to 60 mm and
A cotton wool according to the present invention was obtained in the same manner as in Example 1 except that the time was changed from 10 minutes to 7 minutes.

Example 7 In Example 1, the core-sheath composite ratio was changed from 50:50 to 80:
A cotton wool according to the present invention was obtained in the same manner as in Example 1 except that the heat-bonded cotton of 20 was used and the cotton ball processing time was changed from 10 minutes to 7 minutes.

Example 8 A cotton wool according to the present invention was obtained in the same manner as in Example 1 except that the copolymerization ratio of the isophthalic acid component of the main cotton was changed to 5.0 mol%. It was

Comparative Example 1 Copolymerized polyester obtained in Example 1 except that the copolymerization ratio of IPA as the sheath component was changed to 20 mol% and changed to 10 mol%.
(Softening temperature 225 ° C.), using heat-bonding cotton with 10/25 mm instead of 6/25 mm mechanical crimps, and except that the heat treatment temperature was changed to 220 ° C. to 245 ° C. A cotton wool as a comparative example was obtained in the same manner as in 1.

Comparative Example 2 Copolymerized polyester obtained in Example 1 except that the copolymerization ratio of IPA as the sheath component was changed to 20 mol% to 50 mol%.
An attempt was made to spin a heat-bonded cotton using (softening temperature 95 ° C), but the yarn breakage occurred frequently, so the subsequent work was stopped.

Comparative Example 3 A hard cotton as a comparative example was obtained in the same manner as in Example 1 except that the heat-bonded cotton having a core-sheath ratio of 90:10 instead of 50:50 was used. .

Comparative Example 4 In Example 1, an attempt was made to spin a heat-bonded cotton in which the core-sheath ratio was changed to 50:50 and set to 30:70, but yarn breakage occurred frequently, and the subsequent work was stopped.

Comparative Example 5 In Example 1, the number of mechanical crimps was changed to 6/25 mm to 2
Stirring was performed using a ball-shaped cotton processing machine in the same manner as in Example 1 except that heat-bonded cotton having a size of 25 mm was used. However, since ball-shaped cotton was not formed, the production of hard cotton was stopped.

Comparative Example 6 In Example 1, the number of crimps was changed to 6/25 mm and 15 /
A hard cotton as a comparative example was obtained in the same manner as in Example 1 except that heat-bonded cotton having a thickness of 25 mm was used.

Comparative Example 7 In Example 1, the number of mechanical crimps was changed to 6/25 mm to 3
Stirring was performed using a beaded cotton processing machine in the same manner as in Example 1 except that the main cotton having a size of 25 mm was used. However, since beaded cotton was not formed, the production of hard cotton was stopped.

Comparative Example 8 In Example 1, the number of mechanical crimps was changed to 6/25 mm and 23
Stirring was performed using a beaded cotton processing machine in the same manner as in Example 1 except that the main cotton having a size of 25 mm was used. However, since beaded cotton was not formed, the production of hard cotton was stopped.

Comparative Example 9 A hard cotton as a comparative example was obtained in the same manner as in Example 1 except that the ratio of the heat-bonded cotton and the main cotton was changed to 40:60 and mixed at 5:95. .

Comparative Example 10 A hard cotton as a comparative example was obtained in the same manner as in Example 1 except that the ratio of the heat-bonded cotton and the main cotton was changed to 40:60 and mixed at 50:50. .

Comparative Example 11 In Example 1, the heat treatment temperature was changed to 220 ° C. and 190 ° C.
A cotton wool as a comparative example was obtained in the same manner as in Example 1 except for the above.

Comparative Example 12 A hard cotton as a comparative example was obtained in the same manner as in Example 1 except that the copolymerization ratio of the isophthalic acid component of the main cotton was changed from 5.0 mol% to 1.0 mol%. It was

Table 1 shows the characteristics of the heat-bonded cotton of Examples 1 to 8 and Comparative Examples 1 to 12, the characteristics of the main cotton, the blending ratio and the heat treatment temperature during the manufacture of the cotton, and the evaluation results of the cotton. .

[0063]

[Table 1]

As is clear from Table 1, in Examples 1 to 8 according to the present invention, ball-shaped cotton is stably formed, blown workability is good, and uniform cotton is obtained. The fiber exhibited crimp of the fiber and the settling due to repeated compression was small, and the fiber had an excellent cushioning property. On the other hand, Comparative Example 1 using heat-bonded cotton having a sheath component of polyester having a low IPA copolymerization ratio has insufficient adhesive strength, and the sample after the measurement of the repeated compression residual strain rate is The free part of the main cotton was seen. Also,
Since the sheath component has a high softening temperature, it is necessary to raise the heat treatment temperature, which is difficult to carry out industrially. In Comparative Example 3 using the heat-bonded cotton having a small ratio of the sheath portion, the adhesive force was insufficient, and in the sample after the measurement of the repeated compression residual strain rate, the free part of the main cotton was observed. . Comparative Example 6 using heat-bonded cotton with a large number of mechanical crimps has unstable ball-shaped cotton formability,
Since the heat-bonded cotton and the main cotton were not uniformly dispersed, the adhesiveness and durability were also poor. In Comparative Example 9 in which the mixing ratio of the heat-bonded cotton was small, the adhesion was insufficient, and in the sample after the measurement of the repeated compression residual strain rate, the free part of the main cotton was observed. Comparative Example 10 with a large blended ratio of heat-bonded cotton,
The texture was hard and the cyclic compressive strain rate was low. The hard cotton of Comparative Example 11 obtained by heat treatment at a temperature lower than the melting point of the sheath component of the heat-bonded cotton did not have sufficient adhesion between the main cotton and had deformation due to movement of the cotton. Comparative Example 12, which uses as the main cotton the conjugate fiber spun with the copolyester having a small proportion of the copolymerization of the isophthalic acid component as the main cotton, exhibits insufficient elasticity due to insufficient expression of the spiral crimp of the main cotton. It was poor and had a low cyclic compression strain rate.

[0065]

EFFECTS OF THE INVENTION According to the present invention, the blowing workability is excellent, the moldability is excellent, uniform cotton can be obtained, and the spiral crimping of the main cotton and the heat-bonded cotton by heat treatment is exhibited. By this, it is possible to obtain cotton wool having excellent elastic performance. These cotton wool can be suitably used for a wide range of applications such as sanitary materials, bedding, sofas and cushions.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a cross section (A) of an eccentric core-sheath composite fiber that can be used for the heat-bonded cotton of the present invention and a cross section (B) of a side-by-side type composite fiber that can be used for the main cotton.

[Explanation of symbols]

 1 sheath component 2 core component 3 copolyester 4 polyalkylene terephthalate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location D04H 1/54 D04H 1/54 A

Claims (1)

[Claims] 1. When producing a solid cotton consisting of heat-bonded cotton and main cotton, polyalkylene terephthalate having a melting point of 220 ° C. or higher is arranged as a core component, and a molar ratio of terephthalic acid to isophthalic acid is 85 as a sheath component. : 15-60: 40
Has a softening point of 110 as a result of copolymerization with ethylene glycol.
˜215 ° C. copolyester is arranged, the core component and the sheath component are eccentric, and the core-sheath ratio is 40:60 to 8
It has a latent crimping ability to develop a spiral crimp of 30 pieces / 25 mm or more when freely shrunk at 0:20 at 90 ° C. for 10 minutes, and has a mechanical crimp number of 5 to 10 pieces / 25 mm. Eccentric core-sheath composite fiber is used as heat-bonded cotton, isophthalic acid 2
1 mol of polyalkylene terephthalate having a melting point of 220 [deg.] C. or higher is co-spun with a copolyester having a polyethylene terephthalate unit as a main component, which is obtained by copolymerizing 10 mol% of ethylene oxide adduct of bisphenol A with 1 to 10 mol%.
It has a latent crimping ability to develop a spiral crimp of 30 pieces / 25 mm or more when freely shrinking at 60 ° C for 10 minutes,
The composite fiber with 0 / 25mm mechanical crimp is used as the main cotton, and the heat-bonded cotton and the main cotton are 10:90 to 40: 6.
A ball-shaped cotton having a diameter of 3 to 20 mm is used at a ratio of 0, and the ball-shaped cotton is blown into the side fabric by air blowing and heat-treated at a temperature equal to or higher than the softening temperature of the sheath component of the heat-bonded cotton. A method for producing polyester-based elastic cotton.