JPH0949161A - Production of heat-resistant elastic polyester hard wool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat-resistant elastic polyester hard wool having excellent formability by blending a thermally weldable wool and a main wool, opening the blended product, sending to a prescribed ticking and heat-treating the wool. SOLUTION: A core-sheath conjugate fiber having a core-sheath ratio of 40:60-80:20 and a mechanical crimp number of 3-10/25mm is produced by using a polyalkylene terephthalate having a melting point of >=220 deg.C as the core component and a copolyester having a softening point of 110-215 deg.C and produced by the copolymerization of glycol with a mixture of terephthalic acid and isophthalic acid at a molar ratio of 85:15 to 60:40 as the sheath component and the conjugate fiber is used as a thermally weldable wool. The main wool is produced by carrying out the conjugate spinning of a copolymerized polyester composed mainly of a polyethylene terephthalate copolymerized with 2-10mol% of isophthalic acid and 1-10 mol% of an ethylene oxide adduct of bisphenol A and a polyalkylene terephthalate having a melting point of >=220 deg.C to give a conjugate fiber having a latent crimping property to develop >=30 spiral crimps per 25mm in the free shrinkage at 160 deg.C for 10min and applying 8-20 crimps per 25mm to the obtained latent crimping conjugated fiber by mechanical crimping. The main wool is blended with the thermally weldable wool and the blended wool is opened and heat-treated to obtain the objective hard wool.

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 cotton, bedding, sofas, cushions, interior materials for automobiles, etc. 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 there is a problem in that complicated laterals are difficult to insert.

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 present inventors have arranged a polyester having a low softening point component as a sheath component and a polyalkylene terephthalate as a core component for composite spinning. By blowing air to the lateral side of the main cotton obtained by composite-spinning the heat-bonded cotton with the crimp number within a specific range and the specific copolymerized polyester, and subjecting to heat treatment,
We have found that this problem is achieved and have arrived at 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
A core-sheath ratio of 40:60 to 80:20 and a number of mechanical crimps of 3 to 10 in which a copolymerized polyester having a softening point of 110 to 215 ° C. copolymerized with ethylene glycol as 5:15 to 60:40 is arranged / 25 mm core-sheath composite fiber is used as a heat-bonded cotton, and a melting point of 220 with a copolymerized polyester mainly composed of polyethylene terephthalate units obtained by copolymerizing 2 to 10 mol% of isophthalic acid and 1 to 10 mol% of an ethylene oxide adduct of bisphenol A. A composite crimping of polyalkylene terephthalate at a temperature of ℃ or more and a latent crimping ability to develop a spiral crimp of 30 pcs / 25 mm or more when freely shrinking at 160 ℃ for 10 minutes, and a mechanical crimp of 8 to 20 pcs / 25 mm Using the composite fiber with shrinkage as the main cotton, heat-bonding cotton and main cotton are mixed at a ratio of 10:90 to 40:60 and opened for air blowing. Blowing the side ground Ri is for summarized as method for producing a polyester-based elastic heat resistant solid cotton, characterized in that the heat treatment at a temperature above the softening temperature of the sheath component of the thermoadhesive cotton.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
First, the number of fibers used as the heat-bonded cotton in the present invention is 2
It is a core-sheath composite fiber obtained by composite-spinning various types of polyester as a core-sheath structure. As the core component, polyalkylene terephthalate having a melting point of 220 ° C. or higher, such as polyethylene terephthalate (hereinafter abbreviated as PET) and polybutylene terephthalate (hereinafter abbreviated as PBT), is used. The intrinsic viscosity [η] of PET is preferably 0.45 to 0.75. Adipic acid, sebacic acid, 1,4-butanediol, 1, within a range that does not impair the object of the present invention.
A small amount (10 mol%) of copolymerization components such as 6-hexanediol, diethylene glycol and polyethylene glycol.
It may be contained, or may be added with an additive such as a matting agent or a lubricant. The melting point of the core component is 2
The reason why the temperature is 20 ° C. or higher is to stabilize the spinnability and prevent heat shrinkage 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 re-adhesion may occur during use of cotton and the shape may be changed. It's gone. In the production of heat-bonded cotton, since the sheath component is composed of a polymer having a low softening temperature, the single yarns adhere to each other during the heat treatment to form a fused yarn, so heat setting or heat treatment is not performed after stretching the undrawn yarn. Preferably not.

The core-sheath composite ratio of heat-bonded cotton is from 40:60.
The ratio should be 80:20. Ratio of core component is 8
If it exceeds 0%, the adhesive component will decrease and the adhesive force will decrease. Conversely, if the ratio of the sheath component exceeds 60%, yarn breakage will occur frequently during spinning, resulting in extremely poor operability. The movement of the main cotton is suppressed and the texture becomes harder.

The crimping of the heat-bonded cotton is carried out by using, for example, a stuffing box or a heating gear, and the number of mechanical crimps needs to be 3 to 10/25 mm. If the number of crimps is less than 3/25 mm, the entanglement with the main cotton is not sufficiently performed, and the dispersibility is deteriorated. Further, when the number exceeds 10/25 mm, the fibers are too entangled with each other and the cotton blending with the main cotton is bad, and the cotton wool after heat treatment becomes a block shape, which easily causes fatigue when the cotton wool is repeatedly used.

The crimp rate of the heat-bonded cotton is preferably 3 to 12%. If the crimp ratio is less than 3%, the bulkiness is inferior, and 12%
If it exceeds, the blending with the main cotton that has been opened when blown into the side fabric is poor, and the solid cotton after heat treatment may not be uniform and may become a block.

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, if it exceeds 10 denier, the single yarn denier may be too thick to be entangled with the main cotton, resulting in poor moldability and uniformity after blowing into the side fabric.

The fiber used as the main cotton in the present invention has a melting point of 220 ° C. or higher with a copolyester mainly composed of a polyethylene terephthalate unit obtained by copolymerizing 2 to 10 mol% of isophthalic acid and 1 to 10 mol% of an ethylene oxide adduct of bisphenol A. 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 or an eccentric sheath type, and is a side-by-side type in order to sufficiently develop the crimps by heat treatment. It is preferable that it is excellent in crimp expression ability.

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 manufacturing, for example, 8 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 make the blended cotton with the heat-bonded cotton uniform, and if the number of crimps is too small, the entanglement of the fibers will be weak and the appearance is bulky, but the amount of cotton blown into the side fabric will be small and after the heat treatment it will be a solid cotton. When used repeatedly, it causes fatigue. If there are too many crimps, the entanglement of the fibers will be strong, and the mixture with the heat-bonded cotton will be bad,
After the heat treatment, the cotton is not uniform and becomes block-shaped.

The single yarn fineness of the main cotton is preferably 6 denier or more, more preferably 8 to 20 denier. If the fineness is too small, the cotton will not have hardness, and will have a feeling of bottoming, and it will easily get flattened. Moldability and uniformity after blowing will be poor, and the elasticity of the cotton will be 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.

The fiber length of the heat-bonded cotton and the main cotton in the present invention is preferably 30 to 50 mm. This length is 50
If it exceeds mm, the fibers are entangled in the lengthwise direction and the dispersibility is deteriorated, and when the fibers are blown to the side, the opened main cotton for blowing and the mixed cotton are likely to be deteriorated. Therefore, the formation of the cotton wool after the heat treatment becomes uneven, and the compressive residual strain rate is repeatedly reduced. Further, when the length is less than 30 mm, the fiber length becomes too short and the entanglement with the opened main cotton becomes poor, the formability and the uniformity of the hard cotton after heat treatment are poor, and the cotton easily sags during repeated use. Could be.

In the present invention, the above heat-bonded cotton and the main cotton are mixed and opened, and blown into the side fabric formed into the shape of the product by air blowing, and then heat treated to obtain the solid cotton product. obtain.

The mixing ratio of the heat-bonded cotton and the main cotton is 10: 9.
It is necessary to set the ratio to 0 to 40:60, and if the mixing ratio of the heat-bonded cotton is less than 10%, the amount of adhesive for molding the hard cotton is insufficient and hard cotton cannot be obtained. 40% heat-bonded cotton blend
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.

[0025] It is preferable that the opening is carried out by using an opening machine or a card, and the opening rate is preferably 60% or more.

The wind velocity blown into the side ground is preferably 10 to 50 m / sec. When the air is blown into the side ground, the opening effect still works, but when the wind speed becomes slower than 10 m / sec, the opening effect does not work and the production efficiency of cotton becomes poor, and the formation and uniformity of cotton become poor. However, even if the wind speed is 50 m / sec or more, the power cost for producing a high-speed air flow is increased despite the fact that the opening effect does not change, resulting in an increase in cost.

It is necessary that the temperature of the heat treatment after being sucked into the side fabric is a temperature equal to or 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 copolymerization ratio of isophthalic acid used in the present invention is 15 to 40.
The softening temperature of the sheath component of the heat-bonded cotton which is mol% is about 11
The temperature is 0 to 215 ° C., and the thermal adhesion may be set depending on the copolymerization ratio of isophthalic acid used as the sheath component.

[0028]

According to the present invention, the core-sheath composite fiber having the sheath component having excellent adhesiveness is used as the heat-bonded cotton, and the composite fiber having the latent crimping ability to exhibit the excellent crimping property is used as the main cotton. The cotton with the number of crimps is mixed, blown into the side fabric with the desired shape, and heat-treated at a temperature above the melting point of the sheath component of the heat-bonded cotton, so the heat-bonded cotton and the main cotton are mixed evenly. It is possible to obtain elastic cotton that is molded into a desired shape, and the main cotton exhibits spiral crimp to exhibit excellent cushioning properties and has excellent durability.

[0029]

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

(1) Intrinsic viscosity [η] at 20 ° C. in an equal weight mixed solvent 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 with 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) Repeated compressive residual strain rate under high temperature atmosphere Cotton wool was cut into a size of 300 × 300 × 50 mm and subjected to a method of JIS K-6401 5-3 in a high temperature atmosphere of 90 ° C. Measurement.

(7) Block-shaped 200 g of the obtained cotton wool was pulled up and down from the middle of the thickness, and the number of block-shaped lumps having a size of 5 mm or more was counted. Things, △: 2-5 things,
X: 6 or more were evaluated in 3 grades.

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 at a core-sheath composite ratio of 50:50 and spinning temperature of the core-sheath structure type composite fiber 2
Spin at 70 ° C, 139 holes on spinneret, take-up speed 1000m / min, discharge rate 222g / min, bundled into a bundle and stretched 3.5 times between 50 ° C feeding roller and 60 ° C stretching roller. , A drawn bundle of 400,000 denier, and subsequently introduced into a stuffing box to be mechanically crimped, then an aqueous emulsion containing a nonionic water-soluble finishing oil at a concentration of 1% was applied, and after drying at 60 ° C for 10 minutes, It was cut into 32 mm with a cutter, and heat-bonded cotton with a crimp count of 6/25 mm and a fineness of 4.1 denier was obtained.

On the other hand, a polyethylene terephthalate copolymer polyester [η] = 0.72 and a polyethylene terephthalate [η] = 0.69 obtained by copolymerizing 5.0 mol% of isophthalic acid and 3.0 mol% of BAEO added with 2 mol of ethylene oxide were used. In a composite spinning machine, a side-by-side type composite fiber with a composite ratio of 50:50 was spun at a spinning temperature of 290 ° C., a spinneret hole number of 139 holes, a take-up speed of 1000 m / min and a discharge rate of 386 g / min, and was bundled into a bundle. It is stretched 2.5 times intermittently between a 50 ° C supply roll and a 90 ° C stretch roll, and then heat treated through a 140 ° C heat treatment roll to form a 600,000 denier stretch bundle, which is then introduced into a stuffing box and machined. After crimping, apply a non-aqueous water-based finishing oil solution with a concentration of 1%, dry at 60 ° C for 10 minutes, cut with a cutter to 32 mm, and crimp at 11/25 mm. There were obtained mainly cotton of 10 denier. When this main cotton was subjected to free shrink heat treatment at 160 ° C for 10 minutes, the number of crimps was 42.7 pieces / 25 mm, and the crimp form was a clean spiral shape.

80 g of the obtained heat-bonded cotton and 120 g of the main cotton (ratio of the heat-bonded cotton and the main cotton of 40:60) were mixed and opened, and the size of 400 × 400 × 50 mm was obtained at a wind speed of 40 m / sec. After being blown into the side surface of a rectangular body of a Teflon-processed stainless steel wire net, heat treatment was performed at 220 ° C. for 30 minutes with a hot air dryer to obtain cotton wool according to the present invention.

Example 2 In Example 1, the number of mechanical crimps was changed to 11/25 mm and 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).
A cotton wool according to the present invention was obtained in the same manner as in Example 1 except that the heat treatment temperature was changed from 220 ° C to 220 ° C and the heat treatment temperature was changed from 220 ° C to 150 ° C.

Example 3 In Example 1, the number of mechanical crimps was changed to 11/25 mm and 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.
A cotton wool according to the present invention was obtained in the same manner as in Example 1 except that 10 pieces / 25 mm of heat-bonded cotton was used instead of mm and the heat treatment temperature was changed to 220 ° C. to 235 ° C.

Example 4 Copolymerized polyester obtained in Example 1 except that the copolymerization ratio of IPA as a sheath component was changed to 20 mol% and was changed 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 A hard cotton according to the present invention 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 changed to 10:90.

Example 6 In Example 1, the core-sheath composite ratio was changed from 50:50 to 40:
A hard cotton according to the present invention was obtained in the same manner as in Example 1 except that the heat-bonded cotton of 60 was used.

Example 7 In Example 1, the core-sheath composite ratio was changed from 50:50 to 80:
A hard cotton 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.

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

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 many yarn breakages occurred, and the subsequent work was stopped.

Comparative Example 5 In Example 1, the number of mechanical crimps was changed to 6/25 mm and 2
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 size of 25 mm was used.

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 and 3
A hard cotton as a comparative example was obtained in the same manner as in Example 1 except that the main cotton having a size of 25 mm was used.

Comparative Example 8 In Example 1, the number of mechanical crimps was changed to 6/25 mm and 23
A hard cotton as a comparative example was obtained in the same manner as in Example 1 except that the main cotton having a size of 25 mm was used.

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.
Comparative example was obtained in the same manner as in Example 1 except that

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 to 5.0 mol% in Example 1. It was

Table 1 also 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 heat treatment temperature during the production of cotton, and the evaluation results of cotton. .

[0061]

[Table 1]

As is clear from Table 1, in the hard cottons of Examples 1 to 8 according to the present invention, the heat-bonded cotton and the main cotton are uniformly mixed, and the settleability due to repeated compression is small and the cushioning property is excellent. It was something that had. 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. Further, since the softening temperature of the sheath component is high, 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 5 using heat-bonded cotton with a small number of mechanical crimps and Comparative Example 7 using a main cotton with a small number of crimps
Since the fibers were weakly entangled with each other and uniform cotton was not formed, and the fibers were adhered in a block shape, the releasability and durability were poor. Comparative Example 6 using heat-bonded cotton with many mechanical crimps
In Comparative Example 8 in which the main cotton having a large number of crimps was used, the fibers were too entangled with each other, and the fibers were not evenly mixed and adhered in a block shape. Therefore, the peelability 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. In Comparative Example 10 in which the blended ratio of the heat-bonded cotton was large, the texture was hard and the cyclic compression 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.

[0063]

EFFECTS OF THE INVENTION According to the present invention, the blowing workability is good, the moldability is excellent, uniform cotton can be obtained, and the elasticity of the main cotton due to the spiral crimping is excellent. It is possible to obtain cotton wool having performance.
These cotton wool can be suitably used for a wide range of applications such as sanitary materials, bedding, sofas and cushions.

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.
The core-sheath ratio of the copolyester having a temperature of ˜215 ° C. is 40:60 to 80:20, and the number of mechanical crimps is 3 to 10
Using a core-sheath composite fiber of 25 mm as a heat-bonding cotton, a copolymerized polyester mainly composed of polyethylene terephthalate units 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. A composite crimp of the above polyalkylene terephthalate, which has a latent crimping ability to develop a spiral crimp of 30 pieces / 25 mm or more when freely shrunk at 160 ° C. for 10 minutes, and a mechanical crimp of 8 to 20 pieces / 25 mm. Using the composite fiber to which is added as the main cotton, the heat-bonded cotton and the main cotton are 1
A polyester-based elastic heat-resistant solid characterized by being mixed and opened at a ratio of 0:90 to 40:60, blown into a side fabric by blowing, and heat-treated at a temperature equal to or higher than the softening temperature of the sheath component of the heat-bonded cotton. Method of manufacturing cotton.