JPH10110312A - Pad material having improved organic solvent resistance and method for producing the same - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To provide a pad material having good elasticity and texture and improved organic solvent resistance, and a method of manufacturing the same. SOLUTION: The aggregate of short fibers A occupies 40 to 80% by weight based on the weight of the pad material, and at least two of the following heat-adhesive conjugate short fibers B and heat-adhesive conjugate short fibers C are used. A pad material which is dispersed and mixed as a fusion component in a fiber structure, and in which thermal fixation points as shown in (a) to (e) are scattered in the pad material. (B) Short fiber A and short fiber B
(B) Short fiber A and short fiber C (c) Short fiber B and short fiber C (d) Short fibers B (e) Short fibers (C).
B: Short fiber in which a thermoplastic elastomer as a fusion component having a melting point lower by 40 to 150 ° C. than the melting point of the inelastic polyester polymer constituting the short fiber A is exposed at least on the surface. C: Short fiber in which a crystalline polyolefin polymer as a fusion component having a melting point lower by 25 to 130 ° C. than the melting point of the polymer constituting the short fiber B is exposed at least on the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pad material, and more particularly to a shoulder pad material for adjusting the outer shape of products such as men's clothes and women's clothes, or a brassiere pad used for protecting a local part of a human body. And a pad material that can be usefully used as a clothing material.

[0002]

2. Description of the Related Art Conventionally, as pad materials for clothing materials,
Various proposals have been made, most commonly polyurethane is used because of its elasticity. In this case, a curved pad material is produced as an integral structure through processes such as slicing and shaving from a large urethane block.

[0003] However, as is well known, there are many problems such as a problem of yellowing peculiar to urethane, a problem of light resistance deterioration, and lack of air permeability, and it is easy to be stuffy.

[0004] Further, as a pat material for clothing material using fibers, a plurality of sheets having different sizes and previously punched out in a predetermined size from a thin non-woven fabric sheet are prepared. Eight layers are laminated to form a curved shape,
A method of obtaining a pat material by bonding them to each other with an adhesive and simultaneously performing thermoforming has also been proposed.

However, in this method, the production process becomes extremely complicated, the production efficiency is low, and the shape of the obtained pulp material tends to be large due to the adhesive falling off due to washing or the like.

Further, a method has been proposed in which a card web obtained by mixing thermo-adhesive conjugate short fibers having a low-melting polymer disposed in a sheath component is laminated, and the adhesive component is melted during thermoforming to obtain a pad material. ing.

However, according to this method, the outer peripheral portion of the curved structure is extremely compressed compared to the central portion, so that the hardness of the outer peripheral portion is increased, and the outer peripheral portion becomes unusable. The properties are also extremely poor.

In order to solve these problems, the applicant of the present invention has disclosed in Japanese Patent Application Laid-Open No. 5-195397 that an inelastic polyester short fiber aggregate is used as a matrix and the melting point of the inelastic polyester polymer is 40 ° C. or more. A pat material made of a thermoplastic elastomer having a low melting point and an inelastic polyester, in which the former is mixed with at least an elastic composite short fiber exposed on the fiber surface, and thermoformed, has been proposed.

The pat material obtained by the method disclosed in the above publication has a good texture and extremely good durability by washing with water.

However, it has been found that when dry cleaning is performed, especially when dry cleaning is performed using perclene as a solvent, there is a problem that the shape retention as a pad material is extremely deteriorated.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned prior art and to provide a pad material having good elasticity and texture, and improved organic solvent resistance, and a method for producing the same. It is in.

[0012]

In order to solve the above-mentioned problems, the present inventors have made the above-mentioned prior art, especially the above-mentioned Japanese Patent Application Laid-Open No. Hei 5-
In the invention described in Japanese Patent No. 195397, the inventors have intensively studied the thermal fixation point in the pad material, and when dry cleaning, particularly dry cleaning using perclene as a solvent, the shape retention as a pad material is extremely deteriorated. The problem is that the thermoplastic elastomer in the pad material expands due to the looseness of its polymer structure, and the physical load during washing exerts on it, destroying the thermal fixation points contributed by the elastomer. I determined that.

Based on the above phenomena, further investigations were conducted. As a result, a heat-adhesive conjugate short fiber containing a polymer having high durability against organic solvents as an adhesive component and a heat-adhesive conjugate short fiber containing a thermoplastic elastomer as an adhesive component were used. It has been surprisingly found that the use of the fibers suppresses the above-mentioned destruction of the heat fixing point by the organic solvent while maintaining the performance as a pad material.

That is, according to the present invention, in a pad material comprising a fibrous structure having an inelastic polyester-based crimped short fiber (A) aggregate as a matrix, the short fiber (A) aggregate reduces the weight of the pad material. At least two of the heat-adhesive conjugate short fibers (B) and the heat-adhesive conjugate short fibers (C), respectively, which occupy 40 to 80% by weight as a basis, are fused into the fibrous structure. The components are dispersed and mixed, and in this case, the pad material is characterized in that thermal fixation points as shown in the following (a) to (e) are scattered.
Pad material with improved organic solvent resistance.

(B): Short fibers in which a thermoplastic elastomer as a fusion component having a melting point lower by 40 to 150 ° C. than the melting point of the inelastic polyester polymer constituting the short fibers (A) is exposed at least on the surface. (C): 2 from the melting point of the polymer constituting the short fiber (B)
A short fiber in which a crystalline polyolefin polymer as a fusion component having a melting point lower by 5 to 130 ° C is exposed at least on the surface. (A) Thermal fixation point between short fiber (A) and short fiber (B). (B) The heat fixation point between the short fiber (A) and the short fiber (C). (C) Thermal fixation point between short fiber (B) and short fiber (C). (D) Thermal fixation point between short fibers (B). (E) Thermal fixation point between short fibers (C).

According to the present invention, there is further provided a method for producing a pad material comprising an aggregate of non-elastic polyester crimped short fibers (A) as a matrix, wherein the non-elastic polyester crimped short fibers (A) are used to reduce the weight of the pad material. After mixing at least three of 40 to 80% by weight of a heat-bondable conjugate short fiber (B) and a heat-bondable conjugate short fiber (C) shown below, and forming a web, a plurality of the sheets are mixed. Are laminated and entangled to give a density of the web of 0.009 to 0.009.
After adjusting the thickness to within the range of 0.045 g / cm ^3, the temperature of the web is higher than the melting point of the elastomer in the short fiber (B) and the melting point of the elastomer in the short fiber (B). Preliminary heat treatment is performed at a temperature of 30 ° C. or more, and the mat-like molded body obtained by forming the thermal fixation points shown in (B), (C) and (E) below is cut and packed in a mold. 5 ° C. or more higher than the melting point of the elastomer in the fiber (B) and the elastomer in the short fiber (C),
The heat treatment is performed at a temperature lower than the melting point of the polymer constituting the short fiber (A) by 20 ° C. or more, and the following (A) and (D)
A method for producing a pad material having improved organic solvent resistance, characterized by forming the thermal fixation point described in (1).

(B): Short fibers in which a thermoplastic elastomer as a fusion component having a melting point lower by 40 to 150 ° C. than the melting point of the inelastic polyester polymer constituting the short fibers (A) is exposed at least on the surface. (C): 2 from the melting point of the polymer constituting the short fiber (B)
A short fiber in which a crystalline polyolefin polymer as a fusion component having a melting point lower by 5 to 130 ° C is exposed at least on the surface. (A) Thermal fixation point between short fiber (A) and short fiber (B). (B) The heat fixation point between the short fiber (A) and the short fiber (C). (C) Thermal fixation point between short fiber (B) and short fiber (C). (D) Thermal fixation point between short fibers (B). (E) Thermal fixation point between short fibers (C).

That is, the most important feature of the present invention is to provide a pad material having a single structure, which has been impossible with a pad material consisting only of a fiber material. A fiber using a thermoplastic elastomer as a fusion component of the heat-bondable fiber for heat-fixing the crossing point between the adhesive fibers, and a crystalline polyolefin polymer having good organic solvent resistance as the fusion component. Fibers, and the composite short fibers (B) on which the elastomer is disposed and the composite short fibers (C) on which the polyolefin polymer is disposed are uniformly dispersed in a fiber structure,
A crossing point where the inelastic polyester-based crimped short fibers (A) and / or the heat-adhesive conjugate short fibers serving as a matrix are in contact with each other is formed, and the crossing point is heated to form a heat fixing point.

At this time, the thermal fixation point formed by the elastomer is extremely strong and rich in elasticity, and gives the pad material a good texture and a good durability against a physical load. The thermal fixation point to be formed is, for example, not affected by the cleaning solvent when the pad material is used for clothing and subjected to a dry cleaning treatment or the like. The formed heat fixation point prevents physical deformation due to the above-mentioned cleaning treatment or the like, and prevents physical deformation until the elastomer swelled and brittle by the solvent shows elastic recovery ability. It has the effect of preventing it from being destroyed.

The pad material of the present invention includes the following (a)
It is necessary that the thermal fixation points as shown in (e) are scattered. (A) Thermal fixation point between short fiber (A) and short fiber (B). (B) The heat fixation point between the short fiber (A) and the short fiber (C). (C) Thermal fixation point between short fiber (B) and short fiber (C). (D) Thermal fixation point between short fibers (B). (E) Thermal fixation point between short fibers (C).

Here, due to the presence of the heat fixation points (a), (c) and (d), which involve the heat-bonding conjugate short fibers (B), the effect of improving the durability of the pad material against the physical load is obtained. can get. In addition, the presence of the heat fixing points (b) and (e) involving the heat-adhesive conjugate short fibers (C) has the effect of improving the solvent resistance of the heat fixing points in the pad material. In particular, the heat fixation points (b) and (e) need to be uniformly dispersed in the pad material in order to prevent the above-mentioned elastomer destruction after the treatment.

In the present invention, the aggregate of the inelastic polyester crimped short fibers (A) is 4% based on the weight of the pad material.
It must account for 0-80% by weight. When the content is less than 40% by weight, the pad material obtained is too hard and the feeling is poor. Conversely, if it exceeds 80% by weight, the hardness will decrease and the elasticity will decrease.

In the present invention, the inelastic polyester crimped short fibers (A) include polyethylene terephthalate,
Short fibers consisting of polybutylene terephthalate, polyhexamethylene terephthalate, polytetramethylene terephthalate, poly-1,4-dimethylcyclohexane terephthalate, polypivalolactone, or a copolymer thereof, or a blend of these short fibers, or the above polymer A conjugate short fiber composed of two or more of the components can be used. Preferred among these short fibers are short fibers made of polyethylene terephthalate or polybutylene terephthalate.

The cross-section of the short fiber may be any of circular, flat, irregular or hollow, but the fineness of the short fiber is preferably in the range of 1 to 500 denier, especially 6 to 300 denier. When it is within the above range, the density of the structure can be easily set to an appropriate value, and the elasticity of the structure itself can be further improved. In addition, since the number of components is moderate, elasticity as a cushioning material is more easily developed, and at the same time, durability is improved.

The crimping of the inelastic polyester crimped staple fibers (A) of the present invention is performed by spiral crimping using a composite fiber in which polymers having different heat shrinkages are bonded side by side, or spiral crimping by anisotropic cooling. Alternatively, zigzag crimping by an indentation crimping method may be used, but spiral crimping by anisotropic cooling is most suitable from the viewpoint of bulkiness and production cost.

The heat-adhesive conjugate short fibers (B) of the present invention are formed from a thermoplastic elastomer and an inelastic polyester. In this case, it is preferable that the former is exposed so as to occupy at least half of the fiber surface. In terms of weight ratio, the former and the latter are suitably in a composite ratio of 30/70 to 70/30, and the composite form is any of a side-by-side or a sheath-core sheath-core type. However, the latter is preferred. In this sheath-core type, inelastic polyester is the core, but this core may be concentric or eccentric. In particular, the eccentric type is more preferable since a spiral crimp is developed.

In the present invention, the thermoplastic elastomer is preferably a polyurethane elastomer or a polyester elastomer. As the polyurethane elastomer, a low melting point polyol having a molecular weight of about 500 to 6000, for example, dihydroxy polyether, dihydroxy polyester, dihydroxy polycarbonate, Dihydroxy polyesteramide and the like, and an organic diisocyanate having a molecular weight of 500 or less, for example, p, p'-diphenylmethane diisocyanate, tolylene diisocyanate, isophorone diisocyanate hydrogenated diphenyl methane isocyanate, xylylene isocyanate, 2,6-diisocyanate methyl caproate , Hexamethylene diisocyanate, etc., and a chain extender having a molecular weight of 500 or less, for example, glycolamid. It is a polymer obtained by reaction with alcohol or triol. Among these polymers, a particularly preferable polyol is polyurethane using polytetramethylene glycol, poly-ε-caprolactam or polybutylene adipate. In this case, as the organic diisocyanate, p,
p'-bishydroxyethoxybenzene and 1,4-
Butanediol can be mentioned.

As the polyester-based elastomer, a polyetherester copolymer obtained by copolymerizing a thermoplastic polyester as a hard segment and a poly (alkylene oxide) glycol as a soft segment,
More specifically, terephthalic acid, isophthalic acid, phthalic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-
Alicyclic dicarboxylic acids such as 2,7-dicarboxylic acid, diphenyl-4,4′-dicarboxylic acid and 1,4-cyclohexanedicarboxylic acid, succinic acid, oxalic acid, adipic acid, sebacic acid, dodecanediic acid, dimer acid; At least one dicarboxylic acid selected from the group consisting of aliphatic dicarboxylic acids or ester derivatives thereof, and 1,4-butanediol, ethylene glycol trimethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol neopentyl Glycols, aliphatic diols such as decamethylene glycol, or alicyclic diols such as 1,1-cyclohexane dimethanol, 1,4-cyclohexane dimethanol, tricyclodecane methanol, or ester molded derivatives thereof. At least one of all components and polyethylene glycol, poly (1,2- and 1,3-polypropylene oxide) glycol, poly (tetramethylene oxide) glycol having an average molecular weight of about 400 to 5000, and ethylene oxide and propylene oxide; Poly (alkylene oxides) such as copolymers and copolymers of ethylene oxide and tetrahydrofuran
Ternary copolymers composed of at least one of crycols can be mentioned.

In particular, in terms of adhesiveness, temperature characteristics and strength, polybutylene terephthalate is used as a hard component,
A block copolymerized polyetherester having polyoxybutylene glycol as a soft segment is preferred. In this case, the polyester portion constituting the hard segment is polybutylene terephthalate in which the main acid component is terephthalic acid and the main diol component is a butylene glycol component. Of course, a part (usually 30 mol% or less) of this acid component may be substituted with another dicarboxylic acid component or oxycarboxylic acid component, and similarly, a part of the glycol component (usually 30 mol% or less) is butylene. It may be substituted with a dioxy component other than the glycol component.

The polyether moiety constituting the soft segment may be a polyether substituted with a dioxy component other than butylene glycol. In addition, various stabilizers, ultraviolet absorbers, thickening and branching agents, matting agents, coloring agents, other various improvers, and the like may be incorporated in the polymer as necessary.

The degree of polymerization of the polyester elastomer is preferably in the range of 0.8 to 1.7, particularly 0.9 to 1.5 in intrinsic viscosity. If this intrinsic viscosity is too low,
The heat fixation point formed by the heat treatment is easily broken. On the other hand, if the viscosity is too high, the elastomer becomes less likely to flow at the time of heat fusion, and it is difficult to form a heat fixing point at the intersection of the composite fibers.

These thermoplastic elastomers have a lower melting point than the polymer constituting the inelastic polyester fiber, and thermally reduce the crimp of the crimped synthetic fiber staple during heat treatment for forming a heat fixing point. And the melting point thereof is 40 to 150 higher than the melting point of the polymer constituting the inelastic polyester-based crimped short fiber (A).
It is necessary to be lower by ° C. The melting point of such a thermoplastic elastomer is, for example, in the range of 130 to 220 ° C.

If the melting point difference is less than 40 ° C., the heat treatment temperature during the fusion processing becomes too high, and the crimped short fibers (A)
, Crimping occurs, and the mechanical properties are further reduced. Conversely, if the above melting point difference is larger than 150 ° C., the heat resistance becomes low, and the material is not suitable as a pad material.

When the melting point of the thermoplastic elastomer was not clearly observed, the melting point was replaced with the softening point.

On the other hand, in the composite staple fiber (B), the inelastic polyester used as a partner component of the thermoplastic elastomer is polyethylene terephthalate, polybutylene terephthalate, polytetramethylene terephthalate, poly-1,4-dimethylcyclohexane. Terephthalate, polypivalolactam or copolymer esters thereof, and the like.
Polybutylene terephthalate is preferred.

In the present invention, the thermoadhesive conjugate staple fiber (C) comprises at least a crystalline polyolefin polymer having a melting point 25 to 130 ° C. lower than the melting point of the polymer constituting the thermoadhesive conjugate staple fiber (B). It must be exposed on the fiber surface. If the melting point difference is less than 25 ° C., the heat treatment temperature during the fusion processing becomes too high, causing crimping of the crimped staple fiber (A) and deteriorating the mechanical properties. On the other hand, if the melting point difference exceeds 130 ° C., the heat resistance of the pad material is low, and the pad material is unsuitable.

As the crystalline polyolefin polymer, low density polyethylene, high density polyethylene, polypropylene and the like are preferable. On the other hand, the other component of the crystalline polyolefin is preferably the same as the inelastic polyester used for the elastic conjugate fiber, and in terms of weight ratio, the former and the latter have a composite ratio of 30/70 to 70/3.
Suitably, there is a range of zero. The cross-sectional shape is not limited to the core-sheath type, but may be of a side-by-side or eccentric type. There is no problem as long as the crystalline polyolefin is exposed on the fiber surface.

In the present invention, the composite short fiber (B)
It is preferable that the composite short fiber (B) is used in an amount of 10 to 50% by weight and the composite short fiber (C) is used in an amount of 10 to 50% by weight as the cotton mixing ratio of each of the composite short fibers (C). That is, the conjugate short fiber (B) has a function of improving the durability against a physical load in the pad material, and when the mixing ratio is within the above range, the durability of the obtained pad material is remarkably improved. In addition, the composite short fiber (C) has a function of improving the organic solvent resistance in the pad material, and the dry cleaning resistance of the obtained pad material is remarkably improved when it is within the range of the cotton mixing ratio.

The pad material of the present invention has a curved shape,
It is preferable that the density of the maximum thickness portion is 0.01 to 0.05 g / cm ³ . The maximum thickness portion refers to a portion having the maximum thickness in the pad material. This curved shape is preferable from the viewpoint of conformability with clothes when used for applications such as shoulder pads.

When the density of the maximum thickness portion is within the above range, a pad material having an appropriate hardness that is neither too hard nor too soft can be obtained.

In the production method of the present invention, the inelastic polyester-based crimped staple fiber (A) is added in an amount of 40 to 80% by weight based on the weight of the pad material, and the heat-inhibited polyester fiber (A) shown in (1) and (2) above, respectively. At least three of the adhesive conjugate short fiber (B) and the heat-adhesive conjugate short fiber (C) are mixed and webbed, and a plurality of the webs are laminated and entangled to reduce the density of the web to 0. It is necessary to be in the range of 0.009 to 0.045 g / cm ³ . As described above, first performing the entanglement treatment increases the three-dimensional entanglement of the short fibers in the structure and at the same time leaves as much voids in the structure as possible.
Preliminary heat treatment by heat treatment fixes many entangled points formed by mechanical entanglement with a heat fusion component, and almost completes the network structure formed by heat fixing of short fibers. Finally, by performing final shaping by thermoforming, the purpose of the final heat treatment is substantially limited to imparting shaping properties. Therefore, unnecessary heating is not required, and the surface layer of the pad material is not unnecessarily hardened. That is, a pad material having not only a soft texture as a whole but also a large difference in elastic repulsion between the central portion of the pad material and the outer peripheral portion of the pad material does not occur, and the form retention of the structure is stable. be able to. Further, when the density of the web is less than 0.009 g / cm ³ ,
The compression hardness of the obtained pad material becomes small, and it is difficult to sufficiently express the form of the pad material. On the other hand, 0.04
If it exceeds 5 g / cm ³ , the resulting pad material will have a hard texture.

In the present invention, the temperature of the web is higher than the melting point of the elastomer in the short fiber (B) and the polyolefin polymer in the short fiber (C) by 30 ° C. from the melting point of the polyester constituting the short fiber (A). It is necessary to perform the preliminary heat treatment at a lower temperature. By performing the above preliminary heat treatment, a thermal fixation point is also formed inside the obtained pad material, so that a pad material having good durability can be obtained.

Here, if the temperature range of the preliminary heat treatment is lower than the melting points of the elastomer in the short fiber (B) and the polyolefin polymer in the short fiber (C), a heat-fixing point is not formed, so that the pad material is used. There is a problem in that the handleability of the sheet until molding is deteriorated, and further, since there is almost no heat fixing point inside the pad material after molding, the durability is reduced.

On the other hand, if the temperature exceeds 30 ° C. or lower than the melting point of the polyester constituting the short fiber (A), the heat treatment temperature at the time of fusion processing becomes too high, and the crimped short fiber (A)
In this case, there is a problem that the set of the crimp occurs and the mechanical properties are further deteriorated.

Further, in the manufacturing method of the present invention, the above-mentioned (b) formed by performing the above preliminary heat treatment,
After cutting the mat-shaped molded body having the heat fixation points shown in (c) and (e) and packing it in a mold, the short fiber (B)
It is necessary to perform heat treatment at a temperature higher than the melting point of the elastomer in the short fiber (C) by 5 ° C. or more and lower than the melting point of the polymer constituting the short fiber (A) by 20 ° C. or more. By heat-treating at a temperature in the above range, the thermal fixation points shown in the above (a) and (d) are formed. As compared with a pad material molded into a nonwoven fabric, the surface layer portion and the inside uniformly form a heat-fixed point and have a soft texture, and an unbonded structure does not remain in the inner layer portion.

Here, if the heat treatment temperature is lower than the melting point of the elastomer in the short fiber (B) and the melting point of the elastomer in the short fiber (C) by 5 ° C. or more, a sufficient pad material shape is provided. I can't do that. On the other hand, if the temperature exceeds at least 20 ° C. lower than the melting point of the polymer constituting the short fiber (A), the heat treatment temperature is too high, and the crimped short fiber (A) undergoes crimp sag. There is a problem that the characteristics are deteriorated.

According to the production method of the present invention, the thickness is 10
When filling a 50 mm mat-shaped molded body into a mold, the end of the mat-shaped molded body is chamfered or shaved according to the shape of the final pad material. It is preferable to pack it into
By performing such an operation, the pad material obtained has a uniform hardness, so that the feeling is good.

[0048]

The pad material of the present invention has better elasticity and texture compared to conventional pad materials, and has improved organic solvent resistance, and is useful for shoulder pads, bra pads, etc. Can be.

[0049]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited thereto. In addition, each value in an Example was measured by the following method. (1) Air permeability: Measured using a Frazier-type tester according to the method described in JIS L-1079. (2) Water washability: in conformity with JIS L-0217 104 method described, after measuring the thickness of a domestic washing machine and h _a and h ₀ shown in FIG. 3 in the pad material after water washing 10 times , When the value calculated by the following formula (I) is 70 or more, 場合 when the value is 40 or more and less than 70,
When it was less than 40, it was judged as x.

[0050]

[Number 1] _{100 × h a / h 0 ···} (I)

(3) Dry cleaning resistance: JIS
In accordance with the method described in L-0217 401, the pad material after five times of commercial dry cleaning was used, as shown in FIG.
After measuring the thickness of _a and h ₀ , when the value calculated by the following formula (I) is 70 or more, ○, 40 or more 70
When it was less than △, it was determined as x, and when it was less than 40, it was determined as x.

[0052]

[Number 2] _{100 × h a / h 0 ···} (I)

Example 1 A non-elastic polyester crimped short fiber (A) having a hollow circular cross section and having a denier of 6 denier, having a fiber length of 64 mm, a number of crimps of 10 / inch, and a crimp rate of 13%, comprising polyethylene terephthalate as a main component. ) And a fineness of 9 denier with a polyetherester elastomer having a melting point of 173 ° C as a sheath component and polybutyleneflate as a core component.
A heat-adhesive conjugate staple fiber (B) of 4 mm and a heat-adhesive conjugate staple fiber (C) having a denier of 6 denier and a length of 51 mm in which polyethylene terephthalate is disposed in a core component and polyethylene terephthalate in a core component. 60: 20: 2 by weight ratio
Blended so as to have a ratio of 0, opened with a hopper feeder, and opened with a roller card.
It was of m ² web. Then the web is 20mm thick
A preliminary heat treatment was performed at a temperature of 200 ° C. and a processing time of 2 minutes to produce a nonwoven pat material sheet having a thickness of 20 mm and a density of 0.0175 g / cm ³ , and the shape shown in FIG. The cut-out piece was subjected to thermoforming by a press machine at 200 ° C. for 20 seconds to obtain a pad material. Table 1 shows the results.

[Comparative Example 1] In the same manner as in Example 1, the inelastic fiber having a hollow circular cross-section having a fineness of 6 denier fiber length of 64 mm and a number of crimps of 10 / inch and a crimp rate of 13% containing polyethylene terephthalate as a main component and a melting point of A 173 ° C. polyetherester elastomer is disposed in a sheath component, and polybutylene terephthalate is disposed in a core component.
A pad material was obtained by performing the same operation except that 70 mm of the core-sheath type elastic composite fiber was mixed at 70:30. Table 1 shows the results.

[Comparative Example 2] In Example 1, the foam thickness was 20 mm and the density was 0.02 without using the constituent fibers.
A pad material having the same shape as the pad material of Example 1 was obtained by performing the same operation except that g / cm ³ of urethane foam was used. Table 1 shows the results.

[0056]

[Table 1]

[Brief description of the drawings]

FIG. 1 is a schematic view showing a cross section of a shoulder pad material which is an embodiment of the pad material of the present invention.

FIG. 2 is a schematic diagram showing a cross section of a bra pad material which is one embodiment of the pad material of the present invention.

FIG. 3 is a schematic diagram showing a cross section of a pad material for describing evaluation criteria for water-washing resistance and dry-cleaning resistance of the present invention, and is a grid-filled portion in FIG. D) shows the cross-sectional shape of the pad material after the washing process,
A portion (N in FIG. 3) obtained by combining the lattice portion and the oblique stripe portion in FIG. 3 represents the cross-sectional shape of the pad material before the washing process.

[Explanation of symbols]

N: Cross section of pad material before washing processing. D: Cross section of the pad material after the washing process. h ₀ ··· The thickness of the pad material before the washing process. ha _: The thickness of the pad material after the washing process.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI D04H 1/46 D04H 1/46 Z 1/60 1/60

Claims (4)

[Claims] 1. Inelastic polyester crimped short fibers (A)
A pad material comprising a fibrous structure having an aggregate as a matrix, wherein the short fiber (A) aggregate has a thickness of 4% based on the weight of the pad material.
0-80% by weight, and shown below,
At least two of the heat-adhesive conjugate short fibers (B) and the heat-adhesive conjugate short fibers (C) are dispersed and mixed as a fusion component into the fibrous structure. A pad material having improved organic solvent resistance, characterized by scattered thermal fixation points as shown in the following (a) to (e). (B): Short fibers in which a thermoplastic elastomer as a fusion component having a melting point lower by 40 to 150 ° C. than the melting point of the inelastic polyester polymer constituting the short fibers (A) is exposed at least on the surface. (C): 2 from the melting point of the polymer constituting the short fiber (B)
A short fiber in which a crystalline polyolefin polymer as a fusion component having a melting point lower by 5 to 130 ° C is exposed at least on the surface. (A) Thermal fixation point between short fiber (A) and short fiber (B). (B) The heat fixation point between the short fiber (A) and the short fiber (C). (C) Thermal fixation point between short fiber (B) and short fiber (C). (D) Thermal fixation point between short fibers (B). (E) Thermal fixation point between short fibers (C). 2. The pad material has a curved shape, and the density of the maximum thickness portion is 0.01 to 0.05 g / cm.
The pad material according to claim 1, which is ³ . 3. Inelastic polyester crimped short fibers (A)
In the method for producing a pad material using an aggregate as a matrix, the heat-adhesive conjugate short fibers (A) are each provided with 40 to 80% by weight of the inelastic polyester-based crimped short fibers (A) based on the weight of the pad material. B) and at least three of the heat-adhesive conjugate staple fibers (C) are mixed and webbed, and a plurality of the webs are laminated and entangled to give a web density of 0.009 to 0.045 g. / Cm ³ , and the web is at least 30 ° C. higher than the melting point of the elastomer in the short fiber (B) and the elastomer in the short fiber (B) and the melting point of the polyester constituting the short fiber (A). Preliminary heat treatment is performed at a low temperature, and the mat-like molded body obtained by forming the heat fixation points shown in (B), (C) and (E) below is cut and packed in a mold. ) And a heat treatment at a temperature higher than the melting point of the elastomer in the short fiber (C) by 5 ° C. or more and lower than the melting point of the polymer constituting the short fiber (A) by 20 ° C. or more. A method for producing a pad material having improved organic solvent resistance, characterized by forming the thermal fixation point described in (1). (B): Short fibers in which a thermoplastic elastomer as a fusion component having a melting point lower by 40 to 150 ° C. than the melting point of the inelastic polyester polymer constituting the short fibers (A) is exposed at least on the surface. (C): 2 from the melting point of the polymer constituting the short fiber (B)
A short fiber in which a crystalline polyolefin polymer as a fusion component having a melting point lower by 5 to 130 ° C is exposed at least on the surface. (A) Thermal fixation point between short fiber (A) and short fiber (B). (B) The heat fixation point between the short fiber (A) and the short fiber (C). (C) Thermal fixation point between short fiber (B) and short fiber (C). (D) Thermal fixation point between short fibers (B). (E) Thermal fixation point between short fibers (C). 4. When filling a mat-shaped molded body having a thickness of 10 to 50 mm into a mold, an end of the mat-shaped molded body is chamfered or cut in advance according to the final shape of the pad material. 4. The method for producing a pad material according to claim 3, wherein the material is packed in a mold after the thickness is reduced.