JPH09228216A - Fiber formed product and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a fiber formed product, having excellent hygroscopicity, excellent in air and moisture permeabilities and having characteristics of hardly causing the permanently set in fatigue in spite of the whole softness and provide a method for producing the fiber formed product. SOLUTION: This fiber formed product is formed by mixing conjugated fibers A with B at (80/20) to (40/60) weight ratio of the fibers A/B and partially bonding the mutual fibers. The conjugated fibers A are prepared by copolymerizing a hydrophilic compound I with other components and compounding the resultant copolymer with a copolyester comprising a polar group-containing compound II and/or a cross-linking agent III. The conjugated fibers B are obtained by compounding a polyester X with a polyester Y having a lower melting point than those of all the polyester X and compounded components of the conjugated fibers A so as to expose the polyester Y to the surfaces thereof. Mixed fibers of the conjugated fibers A with B are blown into an air-permeable frame mold, filled in a state of 0.02-0.1g/cm<3> density therein and heated to partially bond interstices among the mutual conjugated fibers A and B and the interstices among the mutual conjugated fibers B. Thereby, the fiber formed product is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a fiber molded body preferably used as a cushioning material and a method for producing the same.

[0002]

2. Description of the Related Art Cushion materials are used for seats, pad materials, door trims, sun visors for vehicles such as trains and automobiles, bed materials for bedding, mattresses, sofas for furniture, etc.
Widely used for cushions and other applications such as filters and clothing pads. Conventionally, as such a cushion material, in addition to a molded product of a foamed resin such as polyurethane, one using a fiber molded product in which synthetic fibers made of a low-melting polymer are mutually heat-sealed has been generally proposed. .

However, since the cushion material made of a foamed resin molding has low air permeability and moisture permeability and has no hygroscopicity, it easily gets damp, and when used for a seat installed in a place where it is exposed to rain or water splash, the cushioning material is used. Water collects inside the material,
There were problems such as the corrosion of the seat and the exudation of water when seated. Further, the cushioning material of the fiber molded body obtained by heat-sealing the low melting point polymer fibers has drawbacks such as poor hygroscopicity and easy settling because the fibers are hydrophobic.

[0004]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a fiber molded article having excellent hygroscopicity, excellent breathability and moisture permeability, and softness as a whole, which is hard to set, and a method for producing the same. To provide.

[0005]

The fiber molded body of the present invention for solving the above-mentioned problems has at least two types of composite fibers A and B.
Are mixed in a weight ratio of A / B = 80/20 to 40/60 and are formed by partially adhering to each other, and the composite fiber A contains the hydrophilic compound (a). Along with copolymerization, a copolymerized polyester containing a polar group-containing compound (b) and / or a cross-linking agent (c) is composited,
Further, the composite fiber B is formed by combining polyester X and polyester Y having a melting point lower than that of any of the composite components of the polyester X and the composite fiber A so as to expose the polyester Y on the surface. It is characterized by that.

The method for producing a fiber molding of the present invention is
A composite fiber A in which a hydrophilic compound (a) is copolymerized and a copolymerized polyester containing a polar group-containing compound (b) and / or a cross-linking agent (c) is composited, a polyester X, the polyester X and the composite. A composite fiber B in which a polyester Y having a lower melting point than any of the composite components of the fiber A is composited so that the polyester Y is exposed on the surface.
And at least two kinds of the above are mixed and opened, and blown into a breathable mold together with a pressurized gas to have a density of 0.02 in the breathable mold.
To 0.1 g / cm ³ and then heat-treated at 80 to 200 ° C. in this filled state to obtain the composite fibers A and B.
And the composite fibers B are partially adhered to each other.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The fiber molded article of the present invention is configured so that at least two types of composite fibers A and B are mixed, and the composite fibers A and B and the composite fibers B are partially separated. Is configured to be fused. Of the two types of conjugate fibers A and B, the conjugate fiber A is mainly provided with hygroscopicity, and the conjugate fiber B is provided with shape fixing property to the fiber molded body by mutual fusion of the fibers.

First, the composite fiber A for imparting hygroscopicity to the fiber molding of the present invention will be described. The composite fiber A that imparts hygroscopicity has, as its composite component, a copolymerized polyester obtained by copolymerizing a hydrophilic compound (a), and the polar polyester containing compound (b) and a crosslinking agent ( At least one of the above (c) is contained.

Since this copolymerized polyester imparts hygroscopicity to the composite fiber A, it is preferable that the hygroscopicity is 12% or more in terms of the moisture absorption / release parameter ΔMR. The higher the moisture absorption / release parameter ΔMR of this copolyester, the higher the moisture absorption / release properties of the composite fiber A, and therefore, more preferably 15% or more, particularly preferably 1% or more.
8% or more is recommended. The upper limit of the moisture absorption / release parameter ΔMR is preferably up to 30%.

Since the composite fiber A has the above-mentioned copolymerized polyester as a composite component, the moisture absorption / release parameter ΔMR of the fiber itself is 1% or more, more preferably 1.2%.
The moisture absorption / release parameter ΔMR of the fiber molded body can be 1% or more, more preferably 1.2%.
Or more. Where moisture absorption and desorption parameter Δ
MR means the moisture absorption rate MR ₂ at 30 ° C. × 90% RH,
It is a value obtained by subtracting the moisture absorption rate MR ₁ at 20 ° C. × 65% RH, and is represented by the following formula ΔMR (%) = MR ₂ −MR ₁ .

This moisture absorption / release parameter ΔMR is, for example, when a fiber molding is used as a middle material of a bed mat,
This is a parameter for obtaining comfort by absorbing the sweat of the human body in the bed mat material and further releasing it to the outside air. The larger the moisture absorption / release parameter ΔMR, the higher the moisture absorption / release capacity. Corresponding to the good comfort of.

In the present invention, the acid component of the copolyester used in the composite fiber A is terephthalic acid,
Examples thereof include aromatic dicarboxylic acids such as isophthalic acid and naphthalene-2,6-dicarboxylic acid, and aliphatic dicarboxylic acids such as adipic acid and sebacic acid. Particularly preferred is terephthalic acid. Examples of the glycol component include ethylene glycol, propylene glycol, tetramethylene glycol, diethylene glycol, neopentyl glycol and the like. Particularly preferred is ethylene glycol.

In the present invention, the hydrophilic compound (a) is essential for imparting hygroscopicity to the copolyester, and the polar group-containing compound (b) and / or the cross-linking agent (c) are hygroscopic. As an auxiliary ingredient to further improve,
It is also necessary as a component that stabilizes the fiber physical properties. It is preferable that at least one of the polar group-containing compound (b) and the cross-linking agent (c) is contained in the copolyester, and it is particularly preferable that both are contained.

The copolymerization amount of the hydrophilic compound (a) in the copolyester is 4 from the viewpoint of hygroscopicity and spinnability.
0 to 99% by weight is preferred. More preferably 55-9
0% by weight. Further, the molecular weight of the hydrophilic compound (a) is preferably 600 to 20,000, more preferably 1,000 to 10,000, and particularly preferably 2 in terms of compatibility with polyester and dispersibility in polyester.
000-6000.

The hydrophilic compound (a) is not particularly limited as long as it is a compound containing at least one ester-forming group, but typical compounds are polyoxyalkylene compounds, polyoxazolines, polyacrylamide and its derivatives. , Polysulfoethyl methacrylate, poly (meth) acrylic acid and salts thereof, polyhydroxyethyl (meth) acrylate, polyvinyl alcohol, and polyvinylpyrrolidone. Among them, polyoxyalkylene compounds are preferable.

As the polyoxyalkylene compound, there are polyoxyethylene compounds, polyoxypropylene compounds, polyoxytetramethylene compounds and the like. Among them, polyoxyethylene compounds are preferable, and polyethylene glycol is particularly preferable. Among polyethylene glycols, polyethylene glycol containing a crystallization inhibitor component is preferable.

Here, the crystallization inhibitor component means an organic residue existing in the molecular chain or at the terminal and disturbing the symmetry of the repeating unit of polyethylene glycol. Crystallization suppression is defined as differential scanning calorimetry (DSC, heating condition 16 ° C /
Min) is lower than the melting point of polyethylene glycol having the same molecular weight. Specific compounds include the following general formula (I)

[0018]

Embedded image (In the formula, X is —CR ₅ R ₆ — (R ₅ and R ₆ represent hydrogen or an alkyl group), —SO ₂ —, —O.
-, -S-, -C (O)-, etc., and 10≤n + m≤4.
An integer of 50 is shown. ), And a compound obtained by adding ethylene oxide (EO) to bisphenol A, bisphenol S, or the like is particularly preferable.

Most of these compounds need to be copolymerized in the polyester, but some of them may be present in a state of being dispersed in the polymer. Further, the polar group-containing compound (b) contained in the copolyester
Is not particularly limited, but is represented by the following general formula (II) Y _i —R ₁ —X _n (II) (wherein, R ₁ is an organic residue, X is an ester-forming group, and n is 1 or more positive The number Y _i represents one or more polar groups selected from derivatives such as an amino group, a sulfonic acid group, a carboxyl group, a hydroxyl group, an amide group, and a phosphonic acid group (an integer of i ≧ 1). Compounds having the polar groups represented are preferred.

The term "containing" as used herein means a state of being dispersed or copolymerized in the polyester, but it is particularly preferable that the polyester is copolymerized. As the compound, a compound having a sulfonate group is particularly preferable. The inclusion of a polar group-containing compound not only increases the hygroscopicity of the polymer, but also has the effect of causing hydrogen bonds and ionic interactions in the polymer, making it difficult for the fiber to change its physical properties over time. .

The content of the polar group-containing compound (b) in the copolyester is preferably 0 to 50 mol%, more preferably 2 to 30 mol% with respect to the acid component constituting the whole polymer.
Mol%, particularly preferably 2 to 15 mol%.
Further, a cross-linking agent (c) contained in the copolyester
Is not particularly limited as long as it is a compound that reacts with the polyester to form a crosslinked structure, but in general, the following general formula (III) (R ₃ O) _n R ₂ (COOR ₄ ) _m (III) (however, In the formula, R ₂ is an organic residue of 3 to 6, R ₃ is hydrogen or an acetyl group, R ₄ is hydrogen or an alkyl group, 3
≦ m + n ≦ 6. It is preferable to use the polyfunctional compound represented by the formula (1).

The term "containing" as used herein includes being dispersed in polyester, but preferably having a crosslinked structure by copolymerization. The compound is preferably a polyfunctional carboxylic acid such as trimellitic acid or pyromellitic acid, or a polyol such as glycerin, trimethylolpropane or pentaerythritol, with trimellitic acid being particularly preferred.

The inclusion of the cross-linking agent (C) not only further increases the hygroscopicity of the polymer, but also has the effect that a cross-linking structure is formed in the polymer and the physical properties of the fiber hardly change with time. To have. The proportion of the cross-linking agent (C) in the copolyester is preferably 0 to 30 mol%, more preferably 1 to 1 with respect to the acid component constituting the entire polymer.
It is 5 mol%, particularly preferably 2 to 10 mol%.

In the copolyester to be composited with the composite fiber A, pigments such as titanium oxide and carbon black, surfactants such as alkylbenzene sulfonates, and conventionally known antioxidants are included within the range not impairing the object of the present invention. Of course, an agent, a coloring preventing agent, a light resistance agent, an antistatic agent, etc. may be added.
In the composite fiber A used in the present invention, other composite components (fiber-forming polymer) to be composited with the copolyester include polyolefins such as polyethylene and polypropylene, polyamides such as nylon 6 and nylon 66, and polyethylene terephthalate. However, polyesters such as polybutylene terephthalate are not limited to these. The most versatile polyester having polyethylene terephthalate as a main component is preferable.

As the composite form of the composite fiber A, a core-sheath type composite fiber comprising a core portion 1 and a sheath portion 2 as shown in FIG. 1, and a core portion 1 and a sheath portion 2 as shown in FIG. Core-sheath type composite hollow fiber composed of hollow part 3, sea-island type composite fiber composed of island part 1a and sea part 2a as shown in FIG. 3, and bonded type composite fiber composed of bonded parts 1b and 2b as shown in FIG. There is a line. Preferably, the copolymerized polyester,
It is used for the core portion 1, the island portion 1a, and the bonding portion 1b of these fibers.

The composite fiber A also includes a blend fiber in which a copolyester is randomly dispersed in a fiber moldable polymer. As the composite ratio of the copolymerized polyester in these composite fibers, for example, in the case of the core-sheath composite fiber (FIG. 1) and the core-sheath composite hollow fiber (FIG. 2), the above-mentioned copolymer polyester is arranged in the core part. , The fiber-forming polymer is placed in the sheath, and the core / sheath =
It is preferably 5/95 to 90/10 (% by weight). It is more preferably 7/93 to 50/50, and particularly preferably 10/90 to 30/70. The lower limit of the composite ratio may be determined from the purpose of imparting sufficient hygroscopicity,
The upper limit of the composite ratio may be determined from the viewpoint of preventing the spinnability from decreasing.

Further, in the case of the sea-island type composite fiber (FIG. 3) and the laminated type composite fiber (FIG. 4), the above-mentioned copolymerized polyester is added to the island portion or one of the laminated portions in a composite ratio of 5 to 90% by weight. It is preferable. It is more preferably from 7 to 50% by weight, particularly preferably from 10 to 30% by weight. The lower limit of the composite ratio may be determined from the purpose of imparting sufficient hygroscopicity, and the upper limit may be determined from the viewpoint of preventing a decrease in spinnability.

In the case of blended fibers, the blending ratio of the above copolymerized polyester to the fiber-forming polymer is 5 to 80% by weight based on the total amount of polymer. Preferably 5
35% by weight, more preferably 7 to 30% by weight.
The lower limit of the compounding ratio may be determined from the purpose of imparting sufficient hygroscopicity, and the upper limit may be determined from the viewpoint of preventing a decrease in spinnability.

Further, the cross-sectional shape of the composite fiber A is not limited to the round shape, but may be a polygonal shape, a flat shape, a multi-lobed shape or the like. The composite fiber A is preferably crimped by mechanical crimping or the like in order to impart bulkiness and a soft feeling to the fiber molded product of the present invention and to improve recovery property against compression. The number of crimps may be appropriately selected depending on the intended use of the fiber molding, but it is preferable that the number of crimps is at least 3 peaks / 25 mm and the crimping degree is at least 5%. In addition, the composite fiber A has a fineness of 0.5 from the viewpoint of imparting compression resistance and softness to the fiber molded body.
It is preferable to use short fibers having a denier of ˜30 and a fiber length of 10 to 100 mm.

Next, the other conjugate fiber B, which mainly contributes to the shape fixing property in constructing the fiber molding of the present invention, will be described. The composite fiber B is formed by using at least two types of polyesters X and Y having different melting points as a composite component. Among them, the polyester Y has a lower melting point than the polyester X and has the above-mentioned composite fiber A.
It is a polyester lower than the composite component of.

The polyester X is not particularly limited as long as it has a fiber-forming property. For example, terephthalic acid, 2,
Polyesters such as polyethylene terephthalate, polybutylene terephthalate, or polyethylene 2,6-naphthalate containing 6-naphthalenedicarboxylic acid or an ester thereof as a main dicarboxylic acid component and ethylene glycol or tetramethylene glycol as a main glycol component can be used.

Examples of the polyester Y include copolymerized polyesters such as polyhexamethylene terephthalate, polyhexamethylene butylene terephthalate and polyhexamethylene terephthalate isophthalate. However, one having a melting point lower than that of either the polyester X selected as the composite partner or the composite component of the composite fiber A must be selected. From the viewpoint of thermal adhesiveness, the melting point difference is preferably 20 ° C. or more, more preferably 25 ° C. or more lower than the melting point of the lower one of the composite components of the polyester X and the composite fiber A.

From the viewpoint of the effect of adhesion and prevention of thermal deterioration, the melting point of polyester Y is preferably in the range of 80 to 170 ° C., more preferably 100 to 1
It is better to be included in the range of 70 ° C. The composite ratio of the polyesters X and Y in the composite fiber B is X / Y = 4 by weight ratio.
0/60 to 80/20 is preferable. More preferably, 5
It is 0/50 to 80/20. When the weight ratio of the polyester Y is less than 20%, the thermal adhesiveness between the fibers may not be sufficiently obtained, and the morphological fixability of the fiber molded product may deteriorate. On the other hand, if the weight ratio of the polyester Y exceeds 60%, the soft feeling of the fiber molded body may be impaired and the compression residual strain may increase.

In addition to the pigments such as titanium oxide other than polyesters X and Y, carbon black and the like, the composite fiber B may further contain an antioxidant, a coloring preventing agent, a lightproofing agent, an antistatic agent and the like. Of course it is okay. As the composite form of the composite fiber B, the core-sheath type composite fiber, the core-sheath type hollow composite fiber, the sea-island type composite fiber, which are exemplified for the above-mentioned composite fiber A,
Both laminated composite fibers and blended fibers can be applied. However, in these composite fibers, it is necessary to arrange so that the low melting point polyester Y is always exposed on the fiber surface.

Further, like the conjugate fiber A, the conjugate fiber B is preferably mechanically crimped in order to impart bulkiness and a soft feeling to the fiber molded body and to improve the recovery property against compression. The number of crimps may be appropriately selected depending on the use of the fiber molding, but the number of crimps is at least 5 peaks / 25 mm.
It is preferable that the crimping degree is at least 5%. In addition, the composite fiber B has a fineness of 0.5 to 30 denier and a fiber length of 10 to 10 in order to improve the shape fixability of the fiber molded body.
It is preferable to use short fibers having a length of 0 mm.

The fiber molded article of the present invention has a weight ratio of the composite fibers A and B constructed as described above, A / B = 4
Mix to be 0/60 to 80/20. If the mixed amount of the composite fibers B is less than 20% by weight, the fusion points between the composite fibers B are reduced, so that the morphological fixability of the fiber molded body is deteriorated. On the other hand, if the mixed amount of the composite fiber B exceeds 60% by weight, the softness of the fiber molded product is deteriorated and the feel becomes rough and hard.

The fiber molding of the present invention can be produced by using the above-mentioned composite fibers A and B by the following manufacturing method. As the raw material fiber, at least two kinds of the composite fibers A and B are used, but other fibers, for example, ordinary polyester fibers may be mixed within a range not impairing the object of the present invention.

The raw cotton of the composite fibers A and B is a breathable formwork (metal mold) formed into a shape after being sufficiently mixed and opened by a cotton feeding machine, a cotton mixing machine and a fiber opening machine used in a usual spinning process. The mold is blown with the air flow (pressurized gas) by a blower fan to fill the mold. In order to blow and fill the raw cotton of the composite fibers A and B into the breathable mold, a mold having a proper breathability is used. For example, JIS
The air permeability measured by a Frazier type air permeability tester of L 1079-1966 is 5 to 200 cc / cm ² · se.
It is preferable to use the one set in the range of c.

Examples of such breathable molds include:
As shown in FIGS. 5 and 6, it is preferable to use a combination of a lower mold 4 and an upper mold 5 which are made of a metal plate punched with a large number of holes. The lower mold 4 has a blow tube 6 on its side surface, and the fibers 7 (that is, the raw cotton of the composite fibers A and B) are blown into the lower mold 4 together with the pressurized gas from the blow tube 6. Fibers 7 blown into the lower mold 4
Are laminated in a state of being arranged randomly in the vertical direction, the horizontal direction, and the thickness direction, so when a certain amount is laminated, the upper mold 5 is lowered and compressed so that the laminated body of the fibers 7 is packed at a constant density. Pressurize.

The density is appropriately determined according to the intended use of the fiber molded product to be obtained, but is preferably 0.02 to 0.
It is set to 10 g / cm ³ . More preferably, 0.025
g to 0.095 g / cm ³ . Density is 0.02g /
If it is less than cm ³ , the fiber molded product becomes too soft and good shape fixability cannot be obtained, and it is cut into a desired shape,
Difficult to mold. On the other hand, if the density exceeds 0.1 g / cm ³ , the softness of the fiber molded product will be deteriorated.

After the density is set as described above, the fiber laminate (mixture of composite fibers A and B) filled in the breathable mold is then kept in the filled state at 80 to 200.
Heat treatment at ℃. By this heat treatment, at least a part of the contact points between the composite fibers B and between the composite fibers A and B are
The low melting point polyester Y of the composite fiber B can be adhered by melting. It is preferable to appropriately select the heat treatment time depending on the density of the fiber mixture and the like.

In the above heat treatment, the heat treatment temperature is 80 ° C.
If it does not satisfy the above condition, sufficient thermal adhesiveness cannot be obtained, and if it exceeds 200 ° C., the fibers constituting the fiber molded product are thermally deteriorated, which is not preferable. After the heat treatment, it is fixed by natural cooling or by forced cooling with cold air. Next, by demolding and taking out the fiber molded body, the target fiber molded body can be obtained.

[0043]

EXAMPLES The methods for measuring various properties used in the examples described below were carried out by the methods described below. (1) Number of crimps and degree of crimp The number of crimps and degree of crimp are JIS L 1015-7-1.
2-1 and JISL1015-7-12-2 were measured according to the method. (2) Fineness It was measured according to the method of JIS L 1015-7-51A. (3) Average fiber length (cut length) Measured according to JIS L 1015A method (staple diagram method). (4) Shrinkage rate Measured according to the method of JIS L 1015-7-12-2. (5) Moisture absorption and desorption parameter ΔMR About 10 g of a fiber molding was prepared, and was dried with a hot air dryer at 60 ° C.
After measuring the weight W ₀ after drying for 20 hours,
The weight W ₁ after being left for 24 hours in a thermo-hygrostat of H and the weight W ₂ after being left for 24 hours in a thermo-hygrostat of 30 ° C. × 90% RH were measured. 20 according to the formula
Moisture absorption rate MR ₁ at 30 ℃ × 65% RH and 30 ℃ × 90% RH
Calculate the moisture absorption rate MR ₂ at.

MR ₁ (%) = {(W ₁ −W ₀ ) / W ₀ } × 100 MR ₂ (%) = {(W ₂ −W ₀ ) / W ₀ } × 100 The above moisture absorption rate MR ₁ and moisture absorption From the rate MR ₂ , the moisture absorption / release parameter ΔMR is calculated by the following formula. ΔMR (%) = MR ₂ −MR ₁ (6) Density of fiber molded body Test piece (vertical; 20 cm, horizontal; 20 cm, thickness; 20
(cm) was allowed to stand in an atmosphere of 20 ° C. × 65% for 24 hours, and then the weight (w) was measured and determined by the following formula.

Density (g / cm ³ ) = w / 8000 Example 1 Production of composite fiber A 194 parts of dimethyl terephthalic acid, 1 ethylene glycol
35 parts, 26.6 parts of dimethyl 5-sodium sulfoisophthalate (SSIA), 7.5 parts of trimethyl trimellitate (TMTM) and 0.1 part of tetrabutylticonate are added, and methanol is distilled off at 140 to 230 ° C. While carrying out the transesterification reaction, 0.08 part of trimethyl phosphate in ethylene glycol and a molecular weight of 4
328 parts of polyethylene glycol, Irganox 1010 (manufactured by Ciba Geigy) as an antioxidant.
2 parts, 0.2 part of silicon as a defoaming agent, and 0.1 part of tetrabutyl titanate were added, and polymerization was carried out under reduced pressure of 1.0 mmHg at 250 ° C. for 4 hours to produce a copolyester.

The proportion of polyethylene glycol copolymerized with this copolymer polyester was 60% by weight. The moisture absorption / release parameter ΔMR of the obtained copolyester was 28.0% (MR ₁ = 1.5%, MR ₂ = 2.
9.5%). This copolymerized polyester is used as a core component, and polyethylene terephthalate having an intrinsic viscosity of 0.70 is separately melted as a sheath component so that the composite ratio (weight ratio) of the concentric core / sheath composite spinneret is 20/80. The fiber was spun to obtain a concentric core-sheath type composite fiber (undrawn yarn).

Then, this undrawn yarn is drawn at a draw ratio of 3.0.
Double stretching was performed at a stretching bath temperature of 80 ° C., and mechanical crimping was applied with a crimper. Furthermore, after drying with a heat setter at 70 ° C,
A finishing oil was added and cut into a cut length of 32 mm to obtain short fibers of a composite fiber A having a fineness of 6.1 denier, a crimp number of 5.6 crests / 25 mm, and a crimp degree of 6.2%. Production of Composite Fiber B Separately from the above, polyethylene terephthalate (X) having a melting point of 255 ° C. and polyethylene terephthalate-based polyester (Y) having a melting point of 110 ° C. copolymerized with 40 mol% of isophthalic acid are used, and X is a core component. , Y as a sheath component and spun at a composite ratio Y / X (weight ratio) = 50/50 to obtain a concentric core-sheath composite fiber (undrawn yarn).

Then, this undrawn yarn is drawn at a draw ratio of 3.0.
Double stretching was performed at a stretching bath temperature of 80 ° C., and mechanical crimping was applied with a crimper. Furthermore, after drying with a heat setter at 70 ° C,
Apply finishing oil and cut to 64 mm cut length.
A short fiber of a conjugate fiber B having a fineness of about 4.2 denier was obtained. Production of Fiber Molded Body 80% of the composite fiber A obtained as described above, the composite fiber B
Is mixed in a ratio of 20%, and further mixed with a roller card.
The fibers were opened to obtain a fiber mixture.

This fiber mixture was blown into a lower die (size 500 × 500 × 500 mm) as shown in FIGS. 5 and 6 together with an air flow, and the packing density was 0.042 g / c.
In a compressed state with m ³ and a thickness of 100 mm, steam setting was performed at 130 ° C. for 30 minutes to set a fiber molded body. This fiber molded article had a moisture absorption / release parameter ΔMR of 4.6%, and had good moisture absorption / release properties. Also, it was hard to get tired, light and soft.

Table 1 shows the characteristics of the composite fibers A and B of the obtained fiber molding and the characteristics of the fiber molding. Example 2 The same composite fibers A and B as in Example 1 were mixed so that the weight ratio of the composite fiber A was 60% and the content of the composite fiber B was 40%.
A fiber molded body having a packing density of 0.041 g / cm ³ was obtained by compression and heat treatment in the same manner as in Example 1.

This fiber molding has a moisture absorption / release parameter ΔM.
When R was 3.4%, the moisture absorption / release property was good. Also,
Hard to get tired, light and soft. The properties of the composite fibers A and B and the properties of the fiber molded body of the obtained fiber molded body are also shown in Table 1. Example 3 The same composite fibers A and B as in Example 1 were mixed so that the composite fiber A was 40% and the composite fiber B was 60% by weight.
A fiber molded body having a packing density of 0.041 g / cm ³ was obtained by compression and heat treatment in the same manner as in Example 1.

This fiber molding has a moisture absorption / release parameter ΔM.
When R was 2.2%, it had good moisture absorption and desorption. Also,
Hard to get tired, light and soft. The properties of the composite fibers A and B of the obtained fiber molded product and the properties of the fiber molded product are also shown in Table 1. Comparative Example 1 The same composite fibers A and B as in Example 1 were mixed so that the composite fiber A was 82% and the composite fiber B was 18% by weight.
A fiber molded body having a packing density of 0.041 g / cm ³ was obtained by compression and heat treatment in the same manner as in Example 1.

Since the mixing ratio of the composite fiber B was less than 20% by weight, this fiber molded product was inferior in shape fixing property and multidirectional cutting property. The properties of the composite fibers A and B and the properties of the fiber molded body of the obtained fiber molded body are also shown in Table 1. Comparative Example 2 The same composite fibers A and B as in Example 1 were mixed so that the composite fiber A was 38% by weight and the composite fiber B was 68% by weight,
A fiber molded body having a packing density of 0.042 g / cm ³ was obtained by compression and heat treatment in the same manner as in Example 1.

This fiber molded product was inferior in softness because the mixing ratio of the composite fiber B exceeded 60% by weight. The properties of the composite fibers A and B and the properties of the fiber molded body of the obtained fiber molded body are also shown in Table 1. Comparative Example 3 The core / sheath ratio (weight ratio) of the composite fiber A was set to 0/100,
The same composite fiber B as in Example 1 was used, and the mixed fiber was mixed so that the composite fiber A was 60% and the composite fiber B was 40% by weight, and the packing density was 0 in the same manner as in Example 1. .041
A fiber molded body having a g / cm ³ was obtained.

However, since the composite fiber A does not have a copolyester which copolymerizes a hydrophilic compound, this fiber molded product has a poor moisture absorption / release property. The properties of the composite fibers A and B and the properties of the fiber molded body of the obtained fiber molded body are also shown in Table 1.

[0056]

[Table 1]

[0057]

As described above, according to the present invention, a fiber molding having excellent moisture absorption and desorption, large breathability and moisture permeability, and stable morphology, is light, soft and hard to set You can get the body.

[Brief description of drawings]

FIG. 1 is a model diagram showing an example of a cross section of a core-sheath type composite fiber used in the present invention.

FIG. 2 is a model diagram showing an example of a cross section of a core-sheath hollow composite fiber A used in the present invention.

FIG. 3 is a model diagram showing an example of a cross section of a sea-island type composite fiber used in the present invention.

FIG. 4 is a model diagram showing an example of a cross section of a laminated composite fiber used in the present invention.

FIG. 5 is a schematic perspective view showing an example of a breathable mold used for producing the fiber molded article of the present invention.

FIG. 6 is a schematic vertical cross-sectional view of the breathable mold of FIG.

[Explanation of symbols]

 1 core part 2 sheath part 1a island part 2a sea part 1b, 2b laminating part 3 hollow part 4 lower mold 5 upper mold 6 blow-in pipe

Claims (6)

[Claims] 1. At least two types of composite fibers A and B are A
/ B = 80/20 to 40/60 in a weight ratio, and is a fiber molded body formed by partially adhering to each other, wherein the composite fiber A is obtained by copolymerizing a hydrophilic compound (a). In addition, the copolymerized polyester containing the polar group-containing compound (b) and / or the cross-linking agent (c) is composited, and the composite fiber B is the polyester X and the polyester X.
And a polyester Y having a melting point lower than that of any of the composite components of the composite fiber A so as to expose the polyester Y on the surface. 2. The fiber molded product according to claim 1, wherein the copolymerization amount of the hydrophilic compound (a) with respect to the copolymerized polyester is 40 to 99% by weight. 3. The fiber molding according to claim 1, wherein the moisture absorption / release parameter ΔMR is 1% or more. 4. The composite ratio of polyester X / polyester Y of the composite fiber B is 40/60 to 80/20 in weight ratio.
The fiber molding according to any one of claims 1 to 3. 5. The fiber molding according to claim 1, which has a density of 0.02 to 0.1 g / cm ³ . 6. A composite fiber A obtained by copolymerizing a hydrophilic compound (a) and a copolymerized polyester containing a polar group-containing compound (b) and / or a crosslinking agent (c), a polyester X, and At least two kinds of polyester X and polyester Y having a melting point lower than that of any of the composite components of the composite fiber A and a composite fiber B composited so that the polyester Y is exposed on the surface are mixed, opened, and added. It is blown into a breathable mold together with a pressurized gas to fill the breathable mold with a density of 0.02 to 0.1 g / cm ³ , and then heat treated at 80 to 200 ° C. in this filled state to obtain the composite fiber. A method for producing a fiber molded body, in which A and B and composite fibers B are partially bonded to each other and then fixed by cooling.