JPH07292534A - Spun yarn and woven or knit fabric using the same - Google Patents

Abstract

PURPOSE:To obtain a spun yarn suitable as a material for woven or knit fabric excellent in stretchability, elongation recovery and resistances to wounds and heat by blend spinning latently crimpable polyester conjugate fibers with aromatic polyamide fibers. CONSTITUTION:This spun yarn is obtained by arranging a copolymer consisting essentially of polyethylene terephthalate copolymerized with 2-7mol% 2,2-bis[4-(2- hydroxyethoxy)phenyl]propane and 5-13mol% isophthalic acid and a polymer substantially comprising polyethylene terephthalate in the side-by-side type, forming latently crimpable polyester conjugate fibers having >=50 peaks/25mm number of developed crimps in heat treatment at 180 deg.C under no load and blend spinning the resultant conjugated fibers with poly-p-phenylene terephthalamide fibers at (95:5) to (70030) mixing ratio. The spun yarn has >=20% dry heat shrinkage factor at 180 deg.C. Furthermore, this woven or knit fabric is produced by using 20-100wt.% resultant spun yarn based on the whole woven fabric. The obtained woven or knit fabric has >=4 to <=20% elongation percentage, >=75 to <=100% elongation recovery ratio, >=50 to <=900g/m<2> basis weight and >=0.2 to <=2.2mm thickness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spun yarn and a woven or knitted fabric using the spun yarn. More specifically, the present invention relates to a spun yarn composed of a polyester composite fiber having latent crimpability and an aromatic polyamide fiber, and a woven or knitted product using the spun yarn.

[0002]

2. Description of the Related Art Polyester fibers are excellent in mechanical properties, thermal stability, washability, etc., so that they are now widely used for clothing, industrial materials, interiors and the like.

[0003] Among them, for clothing applications, in particular, sports clothing and the like, there is a demand for a cloth having excellent stretchability and elongation recovery from the demands of functionality and fit.

Conventionally, as a method of imparting elasticity,
A polyester composite fiber having a latent crimping function is known. For example, in JP-A-3-161519, the copolymerization rate with isophthalic acid is 7 mol% or more.
Composite fibers using up to mol% copolyester are disclosed.

However, in such a composite fiber obtained by copolymerizing only one component of isophthalic acid, crimp expression is not sufficient as a constrained yarn or in a fabric, and a satisfactory elongation ratio and recoverability cannot be obtained. It had drawbacks.

Further, Japanese Patent Application Laid-Open No. 58-109648 proposes a composite yarn using a stretchable long fiber yarn and a fabric using the same, but the core of the spun yarn is stretchable. It has a drawback that the long fiber yarn cannot be uniformly compounded and if the long fiber is arranged outside the spun yarn, the stretchability cannot be obtained at all.

Furthermore, in recent years, the number of people participating in outdoor sports, fishing and snowboarding has increased remarkably,
Along with that, materials for clothing are required to have further improved functionality such as cut resistance and abrasion resistance against sharper blades and ski edges than ever before and heat resistance against cigarette fire and sparks. .

On the other hand, a filament yarn or a spun yarn of 100% by weight of an aromatic polyamide fiber having a high abrasion resistance and a high yarn strength is partially woven, which is actually fair.
Although proposed in Japanese Patent No. 36600 and Japanese Examined Patent Publication No. 62-26900, in both cases, only improvement in tear strength is obtained, heat resistance and cut resistance are not improved, and stretchability is poor, Further, there is a drawback that the interwoven portion of the yarn is not dyed and looks like a streak.

Further, a waterproof sheet or rain implement constituted by using at least 80% by weight of aromatic polyamide fiber in a knitted fabric has been proposed in Japanese Patent Laid-Open No. 292036/1990. In this case, tear resistance is suggested. Although the cut resistance is significantly improved, it has the drawback that it has no elasticity and cannot be dyed.

[0010]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned drawbacks, and is composed of a polyester composite fiber having an excellent latent crimping function and an aromatic polyamide fiber, and has excellent stretchability, The present invention provides a stable supply of spun yarns and woven and knitted fabrics having elongation recovery, cut resistance, abrasion resistance, heat resistance, and relatively clear color development.

[0011]

The spun yarn of the present invention has the following constitution.

That is, in the spun yarn composed of polyester conjugate fiber and aromatic polyamide fiber, the polyester conjugate fiber is 2,2-bis [4- (2-hydroxyethoxy) phenyl] propane in an amount of 2 to 7 mol%. A copolymerized polyester (A) mainly composed of ethylene terephthalate units copolymerized with 5 to 13 mol% of isophthalic acid, and a polyester (B) substantially composed of ethylene terephthalate units are used. A polyester composite fiber having an expression crimp number of 50/25 mm or more, and a mixing ratio of the polyester composite fiber and the aromatic polyamide fiber is 95: 5 to 70:30.
And has a dry heat shrinkage of 20% at 180 ° C.
It is a spun yarn characterized by the above.

The woven or knitted fabric of the present invention has the following constitution.

That is, the spun yarn is used for 20 parts of the entire woven or knitted fabric.
It is a woven or knitted product using 100 to 100% by weight.

The present invention will be described in detail below.

First, the polyester conjugate fiber which is one of the main components constituting the spun yarn of the present invention will be described.

The polyester composite fiber in the present invention is
Copolymerized polyester (A) mainly composed of ethylene terephthalate units, which is obtained by copolymerizing 2 to 7 mol% of 2,2-bis [4- (2-hydroxyethoxy) phenyl] propane and 5 to 13 mol% of isophthalic acid, and It is a latent polyester fiber having a latent crimping property, which is composed of a polyester (B) composed of ethylene terephthalate units, and which develops a spiral crimping by relaxation heat treatment.

The composite form of the composite fiber is preferably a composite fiber bonded side by side from the viewpoint that latent crimping property is easily exhibited.

2,2-bis [4- (2-hydroxyethoxy) phenyl] propane (hereinafter sometimes abbreviated as "BHPP") which is a copolymerization component of the polyester (A) in the present invention has the following structure. It has a formula.

[0020]

[Chemical 1] The BHPP copolymerization ratio of the polyester (A) in the present invention is 2 to 7 mol%. If the copolymerization ratio of BHPP is less than 2 mol%, the shrinkage property becomes insufficient. On the other hand, if it exceeds 7 mol%, the melting point of the polymer decreases,
The strength of the fiber is significantly reduced.

The polyester (A) may be copolymerized with an ester-forming derivative of BHPP. In that case, the total of BHPP and the ester-forming derivative of BHPP may be in the range of 2 to 7 mol% as a copolymerization ratio as described above.

Further, in the present invention, in the polyester (A), the copolymerization ratio of isophthalic acid (hereinafter sometimes abbreviated as "IPA") as another copolymerization component in addition to BHPP is 5 to 13 mol. %.
When the copolymerization ratio of IPA is less than 5 mol%, a substantially large crimp cannot be obtained. On the other hand, when it exceeds 13 mol%, the melting point of the polymer is lowered and the thermal stability is impaired.

The intrinsic viscosities of the polyester (A) and the polyester (B) are from 0.45 to 0.6 from the viewpoint of smoothly performing melt spinning.
0, the intrinsic viscosity of polyester (B) is 0.55 to 0.7
It is preferably 0. Sufficient crimp expression,
Moreover, from the viewpoint of not impairing spinning stability,
The difference in intrinsic viscosity between the two polymers is preferably 0.25 or less.

The polyester (A) and the polyester (B) may be added within a range not impairing the effects of the present invention.
Other copolymerization components may be included. Further, in the composite fiber of the present invention, a flame retardant, an antibacterial agent, an aromatic agent, a pigment,
Various property-imparting agents and additives such as ceramics can be arbitrarily mixed. As the other spinning conditions, conventional spinning conditions for polyester conjugate fiber can be adopted.

The above-mentioned polyester conjugate fiber can be obtained by a usual method of conjugate spinning by melt spinning using the above-mentioned specific polyester.

Further, it is important that the polyester conjugate fiber used in the present invention has an expression crimp number of 50 co / 25 mm or more when heat-treated at 180 ° C. under no load. From the viewpoint of obtaining a woven fabric that is particularly excellent in stretchability and elongation recovery, 60/25 mm is more preferable. 50 crimps / 25mm
When it is less than 1, the stretchability is remarkably lowered and the elongation recovery rate becomes low, which is not preferable. There is no particular upper limit on the number of crimps,
When it is made into a woven fabric, from the viewpoint of obtaining a good texture, it is preferably 70 pcs / 25 mm or less.

Next, the aromatic polyamide fiber which is another one of the main components constituting the spun yarn of the present invention will be described.

Generally, aromatic polyamide fibers have much higher strength and heat resistance than other general synthetic fibers, and have almost no elongation. Therefore, it is often used mainly in the field of industrial materials. In the garment field, the drawback that the fibers cannot be dyed has become a problem.

However, in the present invention, when the aromatic polyamide fiber is mixed with other general synthetic fiber staples in a staple state, the cut resistance, abrasion resistance and heat resistance are greatly improved, and further, dyeing is performed. It also does not interfere with sex.

In the spun yarn of the present invention, the mixing ratio of the polyester composite fiber and the aromatic polyamide fiber is 95: 5-7.
It is important that the range is 0:30.

It is important that the spun yarn of the present invention contains 70% by weight or more of the polyester conjugate fiber in order to sufficiently exert the stretchability. If the amount of the polyester conjugate fiber is less than 70% by weight, the crimp will not be developed in the spun yarn under the restrained state by twisting. On the other hand,
When the polyester fiber content exceeds 95% by weight, the mixing ratio of the aromatic polyamide fiber becomes extremely small, so that the cut resistance, abrasion resistance and heat resistance become poor.

The spun yarn of the present invention mainly comprises the above polyester composite fiber and the above aromatic polyamide fiber. Other general synthetic fibers, semi-synthetic fibers, and natural fibers may be mixed as long as the effects of the present invention are not impaired. Specifically, depending on the desired characteristics, texture, etc., it is preferable that the polyester composite fiber and the aromatic polyamide fiber are combined in an amount of 60% by weight or more, more preferably 80% by weight or more. , And more preferably 90% by weight or more.

It is important that the spun yarn of the present invention has a dry heat shrinkage ratio of 20% or more at 180 ° C. When the dry heat shrinkage is less than 20%, when a woven fabric is formed, a sufficient shrinking force exceeding the binding force of the woven fabric cannot be obtained, and the woven fabric cannot exhibit excellent stretchability.

Next, the method for producing the spun yarn of the present invention will be described.

The above-mentioned polyester conjugate fiber can be obtained by an ordinary method, but mechanical crimping 8 is carried out by an ordinary push-type crimping machine to the extent that neps and unopened troubles do not occur during the carding process. ~ 20 / 25mm
It is preferable to use latent type crimpable raw cotton to which is added.

The above-mentioned aromatic polyamide fiber preferably has a tensile strength of 15 to 30 g / d, a breaking elongation of 2 to 5%, and a thermal decomposition starting temperature of 500 ° C.
Specific examples thereof include poly (p-phenylene terephthalamide), poly (m-phenylene isophthalamide), and aromatic copolyamide.

In the spun yarn of the present invention, the mixing ratio of the polyester composite fiber and the aromatic polyamide fiber is 95: 5-7.
The range is 0:30. It is important for the spun yarn of the present invention to contain 70% by weight or more of the polyester composite fiber from the viewpoint of sufficiently exerting stretchability. If the polyester composite fiber content is less than 70% by weight, crimping will not occur in the spun yarn under the restrained state due to twisting. On the other hand, when the content of the aromatic polyamide fiber is less than 5% by weight, the heat resistance against the fire and abrasion heat of the cigarette and the cut resistance cannot be obtained.

The single fiber fineness of the polyester composite fiber and the aromatic polyamide fiber is not particularly limited, but if the fineness is large, the number of constituent fibers of the spun yarn will be small, and it will be difficult to produce fine counts. A fiber fineness of 3 denier or less is preferable. The fiber length of the polyester conjugate fiber and the aromatic polyamide fiber and the method for producing the spun yarn are not particularly limited, and an ordinary short spinning method or a worsted method can be appropriately used according to the use of the woven or knitted material.

The twisting coefficient (K) of spun yarn is usually 2.5 to
The range of 4.0 is preferable, but a higher setting of 3.5 to 4.5 is preferable because the cut resistance and abrasion resistance are significantly improved and the quality is further improved.

Here, the twisting coefficient K is K = twisting number [times /
in] / (cotton count) ^1/2 .

Next, the woven fabric of the present invention will be described.

The woven fabric of the present invention comprises the spun yarn of the present invention described above in the range of 20 to 100% by weight based on the weight of the entire woven fabric. The spun yarn of the present invention is 2 times the weight of the entire fabric.
If it is less than 0%, sufficient stretchability cannot be obtained. 40
-100% by weight is a preferred range.

The elongation of the woven fabric of the present invention is preferably 4% or more from the viewpoint of fitting property, and is preferably 20% or less from the viewpoint of texture of the woven fabric. When the elongation rate of the woven fabric exceeds 20%, the number of crimp occurrences of the polyester composite fiber of the spun yarn constituting the woven fabric is considerably increased, and thus the woven fabric texture tends to be coarse and hard. The elongation rate of the woven fabric is more preferably 7% to 15%.

From the viewpoint of shape retention, the elongation recovery rate of the woven fabric is preferably 75% or more. 80% or more 1
00% or less is a more preferable range.

On the other hand, in the woven fabric of the present invention, the number of vertical and horizontal woven fabrics is extremely reduced, and even when the spun yarn of the present invention is used, it becomes gauze-like and the crossing points of the yarns become loose and the elongation recovery property is increased. The weight is preferably 50 g / m ² or more from the viewpoint of insufficient, and the weight per unit area is 900 g / m from the viewpoint that the number of cross points of the yarns is extremely increased and it becomes difficult to obtain the stretching ratio.
It is preferably m ² or less.

Further, as the thickness of the woven fabric becomes thinner, a fine count spun yarn is used. However, from the viewpoint of imparting the shrinkage rate as the woven fabric, the woven fabric thickness is preferably 0.2 mm or more. As the thickness becomes thicker, a thicker spun yarn is used to form a woven fabric, which makes it easier to obtain stretchability, but the thickness of the woven fabric is preferably 2.2 mm or less from the viewpoint of rough texture.

The elongation rate and elongation recovery rate are preferably adjusted by appropriately controlling the tension in the textile design and dyeing and finishing.

As a method for designing a woven fabric from the spun yarn of the present invention, the spun yarn of the present invention may be used for both warp and weft, used only for warp, or used only for weft.
In the knitted fabric, 100% by weight of the spun yarn of the present invention is used, and the spun yarn of the present invention can be used in the range of 40 to 100% by weight in the whole woven or knitted fabric by knitting with other spun yarns and filaments.

The spun yarn of the present invention can be used to obtain the woven or knitted fabric of the present invention by an ordinary weaving / knitting method by designing the warp / weft density and texture according to the use of the woven or knitted fabric.

[0050]

EXAMPLES The present invention will be described in detail below with reference to examples.

The method of measuring the characteristic values and the like in the examples is as follows.

<Evaluation of Raw Cotton> (1) Intrinsic Viscosity Measured in an o-chlorophenol solution at 25 ° C. according to a conventional method.

(2) Fineness It was measured by the method of JIS-L1015-7-5-1A.

(3) Number of crimps It was measured by the method of JIS-L1015-7-12-1.

(4) Free Shrinkage Rate According to the method of JIS-L1015-7-15, a load of 300 mg per denier was applied for measurement.

<Evaluation of Woven Fabric> (1) Unit Weight It was measured by the method of JIS-L1096.

(2) Thickness Measured by the method of JIS-L1096.

(3) Elongation rate Measured by the method of JIS-L1096.

(4) Elongation recovery rate It was measured by the method of JIS-L1096.

(5) Resistance to cut wound Two sample sheets were held in the center of the frame body at intervals of about 3 mm, and the slit portion of this sample sheet was made of a rope with two edges at an angle of 60 degrees. Stand the blade vertically and hit it with 50
The maximum load at which the sample sheet is cut when the load is applied at a speed of 0 mm / min is measured.

(6) Hard-melting property (heat-melting property of tobacco) When the sample was brought into contact with the tip of a metal rod (diameter of about 0.6 cm) heated to 360 ° C. for 5 seconds, the degree of perforation was grade 5 ( The grade is judged in 5 grades (no holes are drilled) to grade 1 (holes are completely drilled).

(7) L value The brightness L value is measured using an SM color computer (manufactured by Suga Test Instruments Co., Ltd.).

Examples 1 and 2, Comparative Examples 1 and 2 Ethylene terephthalate as the main component as the polyester component (A), IPA 7.1 mol% and BHPP 4.4 mol%
And a polyester having substantially only ethylene terephthalate as the polyester component (B), and a composite ratio of 50:50 at 290 ° C. from a round cross section spinneret using a composite melt spinning device,
It was wound at a discharge rate of 275 g / min and a speed of 1200 m / min to obtain a side-by-side type undrawn yarn.

After converging these undrawn yarns, a draw ratio of 3.
Stretching at 0 times and stretching temperature 90 ° C, tension heat treatment temperature 140
Heat treatment was carried out at 0 ° C., mechanical crimping was applied with a push-type crimping machine, and then cut to obtain short fibers having a denier of 2 × 51 mm and a crimp number of 14/25 mm. The number of crimps developed during heat treatment under no load at 180 ° C. was 57 cores / 25 mm.

90% by weight of the above polyester conjugate fiber (PE), poly (p-phenylene terephthalamide) fiber ("Kevlar 29" (registered Trademark)) 1
A blended yarn count of 30S (twisting factor K = 3.2) was obtained by blending 0% by weight of the blended yarn by an ordinary short spinning method (Example 1). Further, a mixture of 70% by weight of the above polyester composite fiber and 30% by weight of “Kevlar 29” (registered trademark) (1.5 d × 51 mm) is mixed and spun with a normal short spinning method, and has a yarn count of 30S (twist coefficient K = 3. 2) (Example 2), and 100% by weight of the above polyester composite fiber were spun by a similar short spinning method with a count of 30S (twist coefficient K = 3.2) (Comparative Example 1). 60% by weight of polyester composite fiber and "Kevlar 29" (registered trademark) (1.5d x 51m
m) 40% by weight of the mixed spinning was spun by the normal short spinning method with the mixed spinning yarn count 30S (twist coefficient K = 3.2) (Comparative Example 2).

Table 1 shows the dry heat shrinkage ratios of these spun yarns at 180 ° C.

Further, as a warp yarn, a polyethylene terephthalate filament having a denier of 150 denier (woven density: warp 95 yarns / in) was weft-dried with each spun yarn (woven fabric density: 65 yarns / in) at 130 ° C. Stained with. Table 1 shows the results of examining the weft-direction stretch properties and the difficult-to-melt property of these woven fabrics.

From the results shown in Table 1, the woven fabrics obtained by using the spun yarn according to the present invention (Examples 1 and 2) have excellent stretchability and elongation recovery rate and excellent meltability. Met.

On the other hand, in Comparative Example 2 in which the mixing ratio of the composite fibers constituting the spun yarn is 60% by weight, the spun yarn has a good dry heat shrinkage, but the spun yarn has a dry heat shrinkage ratio of less than 20% and an elongation ratio of 6.4. %, The elongation recovery rate was 67%, and the stretchability was poor.

Further, with 100% by weight of the composite fiber of Comparative Example 1, excellent stretchability was obtained, but the melting resistance was extremely poor.

[0071]

[Table 1] [Examples 3 to 4 and Comparative Examples 3 to 4] The spun yarns obtained in Examples 1 and 2 and Comparative Examples 1 and 2 were woven using warp yarns and weft yarns,
The properties of the woven fabrics (Examples 3, 4 and Comparative Examples 3, 4) obtained by dyeing in the same bath at 130 ° C. and finishing were examined. The results are shown in Table 2.

As is clear from the results shown in Table 2, the woven fabric of Comparative Example 3 made of 100% by weight polyester composite fiber spun yarn has good stretchability in both length and width, but wear strength, wear heat melting, and difficulty. The meltability and cuttability were very poor. Further, Comparative Example 4 was excellent in wear strength, heat-melted by wear, difficult to melt, cuttability, etc., but lacked in stretchability.

In Examples 3 and 4, the stretchability was excellent, and the dyeability was not significantly lowered, and the abrasion strength, the heat-melting abrasion, the difficult melting, and the cuttability were excellent.

[0074]

[Table 2]

[0075]

EFFECTS OF THE INVENTION The spun yarn of the present invention is required not only to have excellent stretchability and elongation recovery property, but also to have excellent cut resistance and heat resistance, and to have functionality such as sports and working clothes, and performance of fit. It is a spun yarn that can provide a cloth suitable for a field of application.

Further, the woven and knitted fabric of the present invention, like the spun yarn, is not only rich in high stretchability, but also excellent in cut resistance and heat resistance. It also has the characteristic that it does not inhibit.

Claims (6)

[Claims] 1. A spun yarn mainly composed of polyester composite fibers and aromatic polyamide fibers, wherein the polyester composite fibers are 2,2-bis [4- (2-hydroxyethoxy) phenyl] propane in an amount of 2 to 7 mol%. A copolymerized polyester (A) mainly composed of ethylene terephthalate units copolymerized with 5 to 13 mol% of isophthalic acid, and a polyester (B) substantially composed of ethylene terephthalate units are used. A polyester composite fiber having an expression crimp number of 50/25 mm or more, and a mixing ratio of the polyester composite fiber and the aromatic polyamide fiber is 95: 5 to 70:30.
And has a dry heat shrinkage of 20% at 180 ° C.
The spun yarn characterized by the above. 2. The spun yarn according to claim 1 in the woven or knitted fabric as a whole.
A woven or knitted fabric containing 0 to 100% by weight. 3. The woven or knitted fabric according to claim 2, wherein the elongation is 4% or more and 20% or less. 4. The woven or knitted fabric according to claim 2, wherein the elongation recovery rate is 75% or more and 100% or less. 5. The woven or knitted fabric according to claim 2, wherein the basis weight is 50 g / m ² or more and 900 g / m ² or less. 6. The woven or knitted fabric according to claim 2, which has a thickness of 0.2 mm or more and 2.2 mm or less.