JP2000328384A - Composite spun yarn and cloth by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sheath-core type composite spun yarn, capable of exhibiting its function such as heat resistance and cut resistance in a fireman's suit or high heat working suit exposed to a flame or a high temperature, excellent in shape holding properties such as a finished appearance, pleats-holding property, wrinkle proof property, etc., being dyed in a dark color and capable of supplying a material for an outdoor sporting cloth or a protective suit also equipped with esthetic properties such as a dyeability for a colorful and vivid color, and a cloth. SOLUTION: This sheath-core type composite spun yarn is constituted by at least 50-70 wt.% sheath component containing dyed totally aromatic polyamide short fiber and at least 30-50 wt.% core component containing a polyester short fiber, and also the ratio of dyed totally aromatic polyamide short fiber occupying in the spun yarn is 50-90 wt.% and the ratio of polyester short fiber occupying the spun yarn is 10-35 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core-sheath composite spun yarn having excellent dyeing properties, cut resistance and heat resistance, and excellent pleating properties and wrinkle-preventing properties of the spun yarn. And a fabric with good tailoring. More specifically, the present invention relates to a core-sheath type composite spun yarn and fabric suitable as a protective garment used in workplaces where there is a high risk of cuts, abrasion, and burns, or a protective garment material that can be worn under severe environments such as outdoor sports.

[0002]

2. Description of the Related Art In recent years, work efficiency, speeding up, and labor saving have been progressing, and the danger of labor and traffic accidents has increased. Therefore, there is a strong demand for safety improvement from the viewpoint of respect for human life. On the other hand, in sports as well, the number of participants increased and became active,
The participation in outdoor sports such as snowboarding, fishing and mountain climbing has been remarkably growing, and as a result sports clothing materials have become more demanding in durability and functionality than ever, especially in cut resistance, heat resistance, etc. What has excellent esthetics, such as pleating property, wrinkle resistance, form retention, and colorful color, is desired. Also,
High heat resistance is also required for heat-resistant work clothes, fire and fire protection clothes, and the like used in welding and steel mills.

[0003] On the other hand, wholly aromatic polyamide fibers having excellent cut resistance, high heat resistance, high chemical resistance and high yarn strength are widely used. For example, those obtained by partially weaving partially using filament yarn or spun yarn of 100% para-aramid fiber are disclosed in Japanese Utility Model Publication No. 1-36006, Japanese Patent Publication No. 62-26900, and Japanese Patent Application Laid-Open No. 2-292,036. Proposed.

[0004] All of these improve tear resistance and cut resistance, but para-aramid fibers are inherently heat-resistant fibers and thus have poor heat-setting properties. There is a disadvantage in that the shape retention is poor, such as the elimination of pleats and the generation of wrinkles. In general, high-strength fibers such as para-aramid fibers are excellent in cut resistance and heat resistance, but have high crystallinity, strong intermolecular bonding force and a dense molecular structure, Is poor, and it is difficult to dye by the dyeing technology applied to other general-purpose fibers.Therefore, at present, dyeing of para-aramid fibers is hardly carried out. It has been done.

Japanese Patent Application Laid-Open No. Hei 3-830 discloses a core-sheath type composite spun yarn in which para-aramid fibers are disposed in a core portion and polyester fibers in a sheath portion, and a uniform blend of polyester short fibers and para-aramid fibers. Japanese Patent Application Laid-Open No. 4-50340 proposes a uniform blend of polyester short fiber, aromatic polyamide fiber and cellulosic fiber. However, para-aramid fibers, which have been difficult to dye with the proposed prior art, have appeared on the fabric surface, and there is a problem in the dyeability of deep dyeing and colorful hues, and conventional dyeing equipment cannot be used. Had such a problem.

On the other hand, there is a means for coloring a stock solution in which a pigment or dye is added to a stock solution for coloring, but the number of colors is limited, and it is difficult to deal with the hue of each customer.

[0007] Uniform blending of aramid fiber with polyester fiber or cellulosic fiber has a problem in uniformity of hue since fibers of different dye types appear on the blended yarn surface. In addition, since polyester fibers and cellulosic fibers having low cut resistance also appear on the surface of the cloth, cut resistance and heat resistance are currently inferior to those of 100% para-aramid fiber cloth.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and is intended to provide functions such as heat resistance and cut wounds in fire-fighting clothes and high-heat work clothes which are to be exposed to flames and high temperatures. It has excellent shape retention such as tailoring, pleat retention, and wrinkle resistance, and is dyed dark.
An object of the present invention is to provide a core-sheath type composite spun yarn and a fabric capable of stably supplying materials for outdoor sports clothing and protective clothing, which also have an aesthetic property capable of being dyed in colorful and vivid colors.

[0009]

The core-sheath composite spun yarn of the present invention that achieves the above object has the following constitution. That is, (1) a core-sheath type composite spun yarn in which a sheath component containing at least a dyed wholly aromatic polyamide short fiber is 50 to 70.
% Of the core component containing at least polyester short fiber is 30 to 50% by weight, and the ratio of the dyed wholly aromatic polyamide short fiber to the spun yarn is 50 to 90% by weight. A core-sheath type composite spun yarn, characterized in that the ratio of the polyester short fiber to the spun yarn is 10 to 35% by weight.

(2) The core-sheath type composite spun yarn according to the above (1), wherein the wholly aromatic polyamide short fiber dyed in the sheath component is a para-aramid short fiber.

(3) The above-mentioned (1), wherein the wholly aromatic polyamide staple fiber of the sheath component is a blend of a dyed para-aramid staple fiber and a meta-aramid staple fiber. Core-sheath composite spun yarn.

(4) The para-aramid short fibers dyed in the sheath component are polyparaphenylene terephthalamide (PPT).
A) The core-sheath composite spun yarn according to any one of the above (2) or (3), which is a short fiber.

(5) The ratio of the dyed para-aramid short fibers to the spun yarn is 25 to 90% by weight, and the ratio of the meta-aramid short fibers to the spun yarn is 60% by weight or less. The core-sheath composite spun yarn according to (3).

(6) The above-mentioned (1) to (1) to (2), characterized in that the core component is blended with not more than 20% by weight of a wholly aromatic polyamide short fiber dyed in the core component and 25 to 50% by weight of a meta-aramid short fiber in the sheath component. The core-sheath composite spun yarn according to any one of (5).

(7) The core component is polyester short fiber 100
(1) to (1) to (1) to (1) to (1), wherein the blended yarn is a blended fiber of at least one selected from the group consisting of a polyester staple fiber, a dyed wholly aromatic polyamide staple fiber, a natural fiber and a cellulosic fiber. (6) The core-sheath composite spun yarn according to any of (6).

(8) A para-aramid staple fiber is made into a dope for spinning from PPTA having an intrinsic viscosity IV (ηinh) of 5 or more and concentrated sulfuric acid, and the dope is once spun into the air through pores of a spinneret. Immediately leading to water and solidifying to form a filament of high strength and high elastic modulus, a step of crimping the filament to form a staple by cutting, and a step of dyeing the filament without being continuous The tensile strength of the para-aramid fiber before dyeing is 15 g / d or more, and the crystal size (110 direction) is 30 to 55 angstroms;
The core-sheath composite spun yarn according to any one of the above (2) to (7), wherein the core-sheath type yarn is formed by always maintaining the water content before dyeing at 8% or more.

(9) dyed para-aramid short fibers,
Alternatively, the dyed para-aramid short fibers and meta-aramid short fibers have a single fiber fineness of 0.5 to 4.5 denier and a twist coefficient K of 2.8 to 6.0.
(8) The core-sheath composite spun yarn according to any of (8).

(10) A fabric comprising the core-sheath composite spun yarn according to any one of the above (1) to (9) in an amount of 30 to 100% by weight of the fabric.

(11) The fabric according to the above (10), which is used for outdoor sports clothing or protective clothing.

[0020]

As described above, according to the present invention, a polyester staple fiber or a blended staple fiber of a polyester staple fiber and a wholly aromatic polyamide staple fiber or a natural fiber is provided on the core of the core-sheath composite spun yarn. And the sheath is covered with 100% of dyed para-aramid staple fiber or 25-50% of meta-aramid staple fiber mixed with the above-mentioned dyed para-aramid staple fiber by a short fiber yarn. Improve the properties, cover the cut resistance of polyester fiber, low heat resistance, put out the whole aromatic polyamide fiber on the spun yarn surface,
The function of the wholly aromatic polyamide fiber is fully exerted, and the polyester short fiber and the polyester short fiber blended yarn of the core impart a tailored prosperity, pleat retention, wrinkle resistance and form retention.

Hereinafter, the present invention will be described in detail.

The core-sheath type composite spun yarn of the present invention has aesthetic properties such as dyeing properties and tailoring, pleat properties, anti-wrinkling properties, and shape retention, which are the major drawbacks of the use of wholly aromatic polyamide fibers in sports clothing and clothing. We have studied diligently for imparting the property without impairing the functional properties of the wholly aromatic polyamide fiber, and the dyeable para-aramid staple fiber is made from PPTA with an intrinsic viscosity (ηinh) of 5 or more and concentrated sulfuric acid for spinning. A dope is made, the dope is once spun into the air through the pores of a spinneret, immediately led into water and solidified to form a high-strength, high-modulus filament, and a step of dyeing the filament is continued. Without dyeing, the para-aramid short fibers before dyeing have a tensile strength of 15 g / d or more and a crystal size (110 direction) of 30. A 55 angstrom,
It can be produced by always keeping the water content before dyeing at 8% or more.

In the present invention, the intrinsic viscosity IV (ηinh)
Is measured by the following method.

Intrinsic viscosity IV (η inh) = (In · η rel) / c where c is the concentration of the polymer solution (0.5 g of polymer in 100 ml of solvent) and η rel (relative viscosity) is the capillary viscosity Is the ratio between the flow time of a polymer solution and its solvent when measured at 30 ° C. using a meter] and the intrinsic viscosity (IV) is defined. In the present invention, the intrinsic viscosity (IV) value is determined by using concentrated sulfuric acid (96% H
₂ SO ₄ ).

In view of required strength characteristics, such a fiber preferably has a tensile strength of 15 g / d or more and an elongation at break of 2 to 5%.

The use of the dyed para-aramid short fibers makes it possible to dye various colors with vivid colors. As a result of various investigations, it was found that spun yarn and para-aramid short dyed on the surface of the fabric were used to sufficiently exhibit the functional properties of cut wound resistance and heat resistance, which are the characteristics of para-aramid fibers and meta-aramid fibers. It has been found that arranging fibers or dyed para-aramid short fibers and meta-aramid short fibers is highly effective and optimal. In addition, the use of the excellent heat-setting properties of polyester fibers is highly effective and optimal for obtaining shape protection such as tailoring of protective clothing, pleat retention, and wrinkle resistance. As a result of various examinations whether or not to combine with a meta-aramid short fiber, a polyester short fiber is arranged at the center of the spun yarn, and a para-aramid short fiber dyed on the outer periphery or a para-aramid short fiber dyed. By covering with a meta-aramid short fiber, they have found that the polyester fiber can protect the cut resistance and the low heat resistance and can sufficiently exhibit the heat setting property of the polyester fiber.

[0027] The core-sheath type composite spun yarn of the present invention is composed of short fibers in both the core and sheath components, and the ratio of the core component to the spun yarn is in the range of 30 to 50% by weight. Is composed of 100% polyester staple fiber or polyester staple fiber blended yarn, and the proportion of polyester staple fiber in the spun yarn is in the range of 10 to 35% by weight. If the proportion of the spun yarn is less than 10% by weight, it is difficult to impart satisfactory heat setting property and shape retention to protective clothing. On the other hand, if the amount of the polyester short fiber exceeds 35% by weight, the heat resistance and the cut resistance, which are the weak points of the polyester fiber, appear, and the excellent functional properties of the para-aramid fiber and the meta-aramid fiber are impaired. More preferably, the ratio of the short fiber bundle to the spun yarn is 40 to 50% by weight, and the ratio of the polyester fiber to the spun yarn is 15 to 30% by weight.

On the other hand, the sheath component is composed of dyed para-aramid short fibers, or dyed para-aramid short fibers and meta-aramid short fibers of 100% by weight. 1
If it is less than 00% by weight, the excellent functional properties of the dyed para-aramid short fibers and meta-aramid short fibers cannot be sufficiently exhibited, which is not preferable. Also, the ratio of the sheath component to the spun yarn is 50 to 50%. When the content is less than 50% by weight, it is difficult to sufficiently cover the polyester short fibers of the core component with the dyed para-aramid short fibers and meta-short fibers of the sheath component. In addition, the excellent functional properties of the meta-aramid fiber cannot be sufficiently exhibited, which is not preferable. On the other hand, if the content exceeds 70% by weight, not only is the blending ratio of the polyester fiber in the core part too low to obtain a sufficient heat setting property, but it is not preferable.
It is not preferable because composite workability deteriorates. Preferably, the ratio of the sheath component to the spun yarn is in the range of 50 to 60% by weight.

Examples of the para-aramid fiber in the present invention include polyparaphenylene terephthalamide fiber and copolyparaphenylene-3,4, oxydiphenylene terephthalamide fiber. Examples of the meta-aramid fiber include polymetaphenylene isophthalamide fiber.

The proportion of the dyed para-aramid short fiber of the present invention in the spun yarn is in the range of 25 to 90% by weight, and when the dyed para-aramid short fiber is mixed with the meta-aramid short fiber, the spun yarn is used. It is preferable that the blend ratio of the meta-aramid staple fiber to the spun yarn is 60% by weight or less, and the blend is preferably selected according to the required sports clothing and protective clothing characteristics.

Next, the short fiber bundle A constituting the sheath component of the core-sheath composite spun yarn will be described. The short fiber bundle A of the present invention is a dyed para-aramid staple fiber, or a dyed para-aramid staple fiber and a meta-aramid staple fiber, and is subjected to a usual short fiber spinning process of batting, carding, Draw,
A sliver or a roving produced by passing through each of the roving and spinning processes. Further, a sliver or a roving through general wool spinning with a longer fiber length (76 to 160 mm) may be used. The single-fiber fineness of the dyed para-aramid staple fiber or the dyed para-aramid staple fiber, meta-aramid staple fiber and staple fiber is 0.5 to 4.5.
Denier is preferred, and 0.8 to 2.
The fiber length is more preferably 5 deniers. The fiber length is not particularly limited, but it is preferable to select the optimum fiber length according to the spinning method.

The para-aramid fiber in the present invention is:
Although it is a polymer obtained by polycondensing terephthalic acid and paraphenylenediamine, a polymer obtained by copolymerizing a small amount of dicarboxylic acid and diamine can also be used. The para-aramid fiber of the present invention is a PP having an intrinsic viscosity (ηinh) of 5 or more.
An optically anisotropic dope is made from TA and concentrated sulfuric acid, and the dope is once spun into the air through the pores of a spinneret, immediately introduced into water and solidified, guided to a Nelson roller and neutralized with an aqueous sodium hydroxide solution. After the washing step, it is slightly dried by a hot roll, and is passed through a step of winding it as a filament into a tube without interruption. The wound para-aramid fiber is packaged with a polyethylene film or the like so as not to dry before the dyeing step. At this stage, the tensile modulus of the fiber is 400
g / D, and has the performance as a high elastic modulus yarn.
When heat treated at 0 to 400 ° C. for 5 to 10 seconds, the crystallinity becomes 50
Usually it exceeds%.

Intrinsic viscosity IV of PPTA used in the present invention
(Ηinh) is desirably 5 or more. Intrinsic viscosity IV (ηinh
) Is less than 5, it is difficult to obtain fiber properties with high strength and high elastic modulus.

The para-aramid fiber of the present invention must have a crystal size (110 directions) of 30 to 55 angstroms and a water content of at least 8% at all times. If the crystal size is less than 30 angstroms, the fibers are insufficiently densified to obtain high-strength and high-modulus fiber properties. If the crystal size is more than 55 angstroms, dyeing becomes difficult.

Here, the condition that the water content is always 8% or more is defined as 8%
What follows is that it has no dry history. When the moisture content is dried to 8% or less, the structure becomes dense and dyeing becomes difficult. Even if water is added again, the dyeability does not recover.
Preferably, the water content of the para-aramid fiber is 15 to 48.
% Is desirable. In order to achieve such a water content, it is desirable to dry the spun para-aramid fiber at a low temperature of 100 to 150 ° C. for 5 to 20 seconds. If the drying temperature is lower than 100 ° C., it is difficult to remove water, which causes a problem in handling after winding the tube. If the temperature exceeds 150 ° C., crystallization proceeds and dyeing becomes difficult. When the water content exceeds 50%, the resistance of the yarn guide increases and it becomes difficult to wind up the filament. In the present invention, the dyeing method for dyeing para-aramid fibers having such physical properties requires special equipment. No special method is required, and existing dyeing equipment for synthetic fibers can be used. The pH was adjusted by adding an appropriate amount of dye, auxiliary and acid, and dyeing was started at 60 ° C.
This can be achieved by raising the temperature to 30 ° C. and dyeing for 30 minutes. As the dye, a cationic dye, a disperse dye, or the like can be used, but a cationic dye that easily penetrates into a dense structure is preferable.

The dyed para-aramid fiber filaments are crimpered and crimped (6 crimps / inch).
To obtain a colored para-aramid fiber staple which is cut into 1.5 to 6 inches by a length suitable for spinning, for example, usually a square cut.

Further, stapling is also performed by variable cutting having an average fiber length of ± 2 inches, and may be performed by a stapling method in which the long fibers are cut by a speed difference between at least one pair of rollers holding the long fibers.
The dyeing process may be performed on filaments or subtows before stapling or after stapling.

Next, an example of a dyeing method for dyeing the dyeable para-aramid short fibers in dark blue will be described.

Owf indicates the weight% of the dye based on the weight of the dried fiber. g / l indicates the weight ratio of the assistant to 1 liter of the prepared dyeing bath.

Dyes: Astrazon Golden Yellow GL (CI Yellow 28) (manufactured by Dyster) 0.1% owf Kayacryl Red GL (CI Red 29) (manufactured by Nippon Kayaku) 2.0% owf Aizen Catilon Blue 8.0% owf Auxiliary agent: "Neodespon AC" (Morin Chemical Co., Ltd.) 2 g / 1 Acetic acid 1 g / 1 Sodium nitrate 20 g / 1 "Teryl Carrier A111" (Meisei Chemical Co., Ltd.) 20 g / 1 [CI of the dye name indicates the color number in the meaning of the color index] Dyeing was started at a bath ratio of 1:15, 60 ° C, and 13 minutes in 60 minutes.
The temperature was raised to 0 ° C., and staining was performed for 30 minutes. After dyeing, the resultant was subjected to reduction washing at 80 ° C. for 20 minutes in a bath composed of a nonionic activator and a reducing agent. JIS L 0
The color fastness to 842 was tertiary and extremely high as a para-aramid fiber.

The short fiber bundle B constituting the core component is 100% by weight of polyester short fibers or a blend of polyester short fibers and other fibers. The ratio of para-aramid short fibers and meta-aramid short fibers dyed in the short fiber bundle B constituting the core component to the short fiber bundle B is 2%.
It may be blended within 0% by weight, thereby enhancing the functional properties of para-aramid fibers and meta-aramid fibers. If it exceeds 20% by weight, the functional properties of para-aramid fibers and meta-aramid fibers Is improved, but the blending ratio of the polyester fiber is decreased, and it is difficult to impart satisfactory shape retention to the protective garment, which is not preferable. Preferably it is within 15% by weight.

Further, the blended fiber may be a flame retarded cotton fiber or a cellulosic fiber, or a blended yarn of these.

The twist direction of the core-sheath composite spun yarn of the present invention is S,
It is preferable that the twist coefficient K (twist number = K · count ^1/2 ) be slightly higher than that of a general spun yarn because the core is covered with para-aramid short fibers and meta-aramid short fibers. , K = 2.8-6.0 is desirable, K = 2.8
If K is lower, the composite workability of the core and the sheath deteriorates, which is not preferable. If K is higher than 6.0, the twist becomes too strong and the occurrence of double twist becomes strong, and the workability deteriorates.
A range of 4.5 is more preferred.

Next, a method for producing the core-sheath composite spun yarn of the present invention will be described. When the short fiber bundle A of the sheath component is a sliver or a roving, the method for producing a composite spun yarn according to the present invention uses a ring spinning machine having a front top roller and a front bottom roller including a pair of tapered rollers via a guide. Short fiber bundle A after aprondraft passed to the side where the front roller has a high feed amount
And the short fiber bundle B after the aprondraft passed through to the side where the amount of feed is low is simultaneously spun, and the short fiber bundle A is wound around the short fiber bundle B at the time of actual twisting, so that the core is What is necessary is just to make it the thread | yarn in the state which wrapped the short fiber bundle B of a component part in a twist shape.

FIG. 1 shows an outline of draft twisting in a spinning machine for producing a core-sheath composite spun yarn of the present invention.

The short fiber bundle A and the short fiber bundle B set in the spinning machine are supplied to the back roller 2 via the trumpets 1a and 1b, respectively, and after passing through the apron draft 3 to the pair of tapered front rollers 4a and 4b. Be gripped.

This pair of tapered front rollers 4
In a and 4b, the short fiber bundle A is supplied via the trumpet 1a to the side where the delivery amount is large (the side with a large diameter), and to the side where the delivery amount is small (the side with a small diameter) via the trumpet 1b. The short fiber bundle B is supplied. Next, the short fiber bundles A and B, which come out while being gripped by the tapered front rollers 4a and 4b, are united in a range of 3 to 10 mm, and the short fiber bundle B is coated with the short fiber bundle A as a core-sheath type. The composite spun yarn 5 is formed and wound around a yarn tube 8 while giving a real twist thereto by a ring 6 and a traveler 7.

In the present invention, the short fiber bundle B constituting the core may be formed in a spun yarn state in advance. In this case, as a spun yarn of a continuous yarn constituting a core component, a spun polyester short fiber yarn 100
% Or polyester short fiber blend spun yarn.

The method for producing the core-sheath type composite spun yarn having the above-mentioned spun yarn as a core is not particularly limited, but when the short fiber bundle of the sheath component is a sliver or a roving, for example, a pair of tapered rollers A ring spinning machine having a front top roller and a front bottom roller consisting of: a trumpet, a back roller, an apron roller, and a front roller. After passing through the guide to the lower side of the short fiber bundle, it is spun from the front roller at the same time as the short fiber bundle, and the short fiber bundle is wound around the continuous spun yarn at the time of actual twisting, and the spun yarn of the core forming part It can be obtained by forming a yarn in a state of being wrapped in a twisted shape.

In the core-sheath composite spun yarn of the present invention, the ratio of the wholly aromatic short polyamide fibers of the sheath component in the spun yarn is 5%.
0 to 70% by weight, containing 25 to 90% by weight of the dyed para-aramid short fiber of the present invention, and a blend of a polyester short fiber and a polyester short fiber of a wholly aromatic polyamide short fiber bundle A and a short fiber bundle B. By appropriately setting the composition ratio of the yarn, the core-sheath composite spun yarn of the present invention can be obtained.

The interval at which the core and sheath fiber bundles are united changes the difference in the amount of feed of both components, that is, the winding state of the short fiber bundle A, and is determined by considering the overlapping state and the physical properties of the spun yarn. Good.

Next, the core-sheath composite spun yarn of the present invention may be woven or knitted as a single yarn or a double yarn.
0% may be used, but the knitting and weaving with filaments, processed yarns, elastic fibers, etc., and the spun yarn of the present invention are used in specific parts where heat resistance and cut resistance are required. Can be obtained, but it is used in the range of 30 to 100% of the total weight of woven or knitted products. If the spun yarn of the present invention is less than 30% of the total weight of the woven or knitted product, even if the yarn of the present invention is used in a specific portion, it becomes difficult to obtain sufficient heat resistance, cut resistance, and dyeability,
Not preferred. Preferably it is in the range of 50 to 100%.

[0053]

The present invention will be described below by way of examples. The physical properties in the examples were determined by the following measurements. <Crystal size> Wide angle X-ray analysis was used.

X-ray analyzer: 40 manufactured by Rigaku Denki Co., Ltd.
36A2 type X-ray source: CuKα ray Curved crystal monochromator (using graphite) <Intrinsic viscosity> Intrinsic viscosity IV = (ηinh) is a polymer at a concentration (C) of 0.5 g / dl in 98.5% by weight of concentrated sulfuric acid. Is measured at 30 ° C. by a conventional method.

(Ηinh) = (ln · ηrel) / C (where ln is a natural logarithm) <Strength and elongation characteristics of fiber> Tensile strength and tensile elastic modulus (initial tensile resistance) of the yarn are determined according to JIS L1013. Was. <Moisture content> The moisture content was measured according to JIS L1013.

Adhered moisture percentage (%) = (W−W1) × 100
/ W1 Here, W: mass at the time of sample collection W1: mass at the time of sample drying <cut resistance> Two sample sheets are gripped at an interval of about 3 mm at the center of the frame, and slits of the sample sheet are formed. The maximum load at which the sample sheet is cut when a ceramic blade with a blade on two sides is set upright at an angle of 60 degrees and the edge is applied at a speed of 500 mm / min. Is measured. <Pleatability> Cut a 25 cm long sample in the vertical direction of the woven or knitted fabric, mark it at 5 cm intervals in the length direction (4 places), fold 15 cm at the center, and triple the sample at 5 cm length Then, the sample is pressed with a normal press at a press surface temperature of 140 ° C. and a press pressure of 0.5 kg / cm ² for 10 seconds, and then subjected to vacuum treatment for 10 minutes to cool the sample. The pleating property (how to make pleats) was judged with the naked eye.

The criteria are as follows.

Grade 5: Very sharp pleats Grade 4: Sharp pleats Grade 5: There are pleats Grade 5: There are some pleats Grade 5: There is almost no pleats <Pleat retention> Using a sample for which pleating properties were evaluated J
The pleating property of the sample after washing was evaluated based on the IS L 0217-103 method. The results were graded as pleated retention. <Poor melting (tobacco heat melting)> The degree of piercing when the sample is brought into contact with the tip of a metal rod (about 0.6 cm in diameter) heated to 500 ° C for 5 seconds is class 5 (no piercing). Classification was made in five grades of 級 grade 1 (holes were completely opened). <L value (degree of dyeing)> L value is measured according to JIS Z 8729.
Followed. The measuring instrument is Macb manufactured by Sumika Chemical Analysis Service, Ltd.
eth Color 3000 was used.

In the case of the same hue, the smaller the numerical value, the better the dyeing. [Example 1, Comparative Example 1] PPTA obtained by a usual method
(Ηinh = 6.5) was dissolved in 99.9% concentrated sulfuric acid to obtain a spin dope having a polymer concentration of 19.0% and a temperature of 80 ° C.
After spinning into the air for a short time from a die having a pore size of 0.06 mm and a number of 1000 pores, it is introduced into water at 4 ° C., solidified, guided to a Nelson roller, and neutralized with an 8% aqueous sodium hydroxide solution. After processing and washing with water, use a hot roller for 110
At 15 ° C. for 15 seconds and winding it into a plastic tube without interruption, and the number of filaments is 1
Thus, a para-aramid fiber filament yarn (Example 1) having a total fineness of 1500 denier (equivalent to absolute dryness) consisting of 2,000 was obtained. Without winding the para-aramid fiber of Example 1 into a tube, the para-aramid fiber filament yarn was guided to a hot roller installed thereon, further subjected to a heat treatment at 350 ° C. for 10 seconds, and then wound and dried. (Comparative Example 1) was obtained.

These para-aramid fiber filament yarns are pressed and crimped at a rate of 6 ridges / inch by a crimper, and 1500 denier (single fiber fineness: 1.5 denier) is cut into 1.5 inches and 2 inches. Staples of 38 mm and 51 mm were used.

Table 1 shows the physical properties of these para-aramid fibers.
Shown in

[0062]

[Table 1]

An example of a method for dyeing para-aramid fiber staples will be described. The para-aramid short fibers of the present invention were dyed dark blue under the following conditions. owf indicates the weight% of the dye based on the weight of the dried fiber. g / l indicates the weight ratio of the assistant to 1 liter of the prepared dyeing bath.

Dye: Astrazon Golden Yellow GL (CI Yellow 28) (manufactured by Dyster) 0.1% owf Kayacryl Red GL (CI Red 29) (manufactured by Nippon Kayaku) 2.0% owf Aizen Cathilon Blue 8.0% owf Auxiliary agent: "Neodespon AC" (Morin Chemical Co., Ltd.) 2 g / 1 Acetic acid 1 g / 1 Sodium nitrate 20 g / 1 "Teryl Carrier A111" (Meisei Chemical Co., Ltd.) 20 g / 1 [CI of the dye name indicates the color number in the meaning of the color index] Dyeing was started at a bath ratio of 1:15, 60 ° C, and 13 minutes in 60 minutes.
The temperature was raised to 0 ° C., and staining was performed for 30 minutes. After dyeing, the substrate was washed by reduction in a bath containing a nonionic activator and a reducing agent at 80 ° C. for 20 minutes, dehydrated and dried, and the L value was measured. In the case of the same color, a smaller numerical value indicates better dyeing. In the dyeing method using the dyeing bath according to the above case, the L value is 50.
The following levels were judged to be dyed.

The para-aramid fiber of Example 1 adsorbed the dye well, but the para-aramid fiber of Comparative Example 1 was hardly dyed. [Examples 2 to 4, Comparative Examples 2 to 4] A surfactant was applied to the para-aramid fiber staple obtained in Example 1 by a dipping method for the purpose of preventing static electricity and improving spinnability.

These staples were kept sealed in a plastic bag until the dyeing step to prevent moisture from drying out, and were dyed dark blue by cotton dyeing according to the above-mentioned dyeing recipe.
The physical properties of the staple are fineness 1.5d, fiber length 51mm
Tensile strength 23 g / d, elongation at break 3%, thermal decomposition temperature 50
It was 0 ° C.

Using these dyed para-aramid short fibers 100% as the short fiber bundle A of the sheath component, a roving yarn having a thickness of 0.6 g / m was prepared by a usual 2-inch spinning method.

As a core component, a short fiber bundle B, a polyester short fiber having a fineness of 1.5 d and a fiber length of 51 mm, was roasted at 0.7, 0.3, 0.2 g / m by a usual 2-inch spinning method. Created. Using each roving, it is set on a 2 inch ring spinning machine having a pair of front taper rollers, and the roving of the short fiber bundle A of the sheath component is supplied from the back roller to the higher side of the front roller sending amount through the trumpet, The polyester short fiber bundle B of the core component was supplied to the back roller and the front roller through the trumpet to the supply side of the front roller where the feed amount was low. The spinning total draft is 33.0 to 20.4 times, the core-sheath type composite spun yarn count is 15 ^S (cotton count), and the twist coefficient is K = 3.0.
5 (13.6 T / in). 5 spaces between both fleece
After adjusting the distance between the trumpet and the guide and the collector so as to obtain a diameter of 0.6 mm, the mixture is drafted and united, wound into a yarn tube by a usual method, and the ratio of the para-aramid short fibers dyed in the sheath component to the spun yarn is 46. 2,66.7,7
5.0% of three types (Comparative Example 2, Example 2, and Example 3) The ratio of polyester staple fiber to spun yarn is 53.8, 3
3.3 and 25.0%.

As Comparative Example 3, para-aramid staple fiber 10 which was difficult to be dyed was obtained in Comparative Example 1 in both core and sheath components.
Spun yarn 15 ^S with 0% core and 50% / 50% sheath ratio,
K = 3.5 was obtained by composite processing using a spinning machine having a front taper roller in the same manner as in Example 2.

Further, as Example 4 and Comparative Example 4, the short fiber bundle B of the core component was prepared by mixing 0.4 g / m and 0.3 g / m roving of 50% polyester / 50% cotton (combed cotton). A 1.4 g / m roving of 100% dyed para-aramid short fiber of the present invention was prepared as a sheath component, and subjected to composite processing using a spinning machine having a front taper roller in the same manner as in Example 2. ^15S , K = 3.5 The ratio of para-aramid short fibers dyed with a sheath component in the spun yarn is 77.8%.
And 82.4% of a core-sheath composite spun yarn. Polyester short fiber accounts for 11.1%, 8.8% of spun yarn
(Example 4, Comparative Example 4).

These seven types of spun yarns were twisted and set at 90 ° C. for 20 minutes to prepare plain woven fabrics using 100% of each yarn. A sizing agent was applied to the warp during weaving, and the weaving density was 78 warp yarns. / In, 65 wefts / in, 98 cm weave width, and then the appearance of para-aramid fiber on the fabric surface (covering state), the degree of dyeing (L value), cut resistance, heat resistance and pleating property evaluated.

As shown in Table 2, in Comparative Example 2 in which the proportion of the polyester fiber in the spun yarn was 53.8%,
Although the shape retention properties such as wrinkle resistance are good, the blending ratio of the polyester fiber of the core component in the spun yarn is high and the coating properties of the para-aramid fiber are insufficient, so that the functional properties of the para-aramid fiber cannot be fully exhibited. The dyeing degree L value is also 52.8.
Comparative Example 4, in which the ratio of dyed para-aramid fiber to the spun yarn was 82.4%, which was inferior in functional properties such as cut resistance and heat resistance, and the conventional para-aramid fiber 100% of the spun yarn of Comparative Example 3 exhibits the functional properties of para-aramid fiber, that is, cut resistance and heat resistance, but the proportion of the polyester fiber in the spun yarn is 5.6.
% And as low as 0%, the form retention such as pleating property was inferior, and the L value was as high as 65.5, and the dyeability was inferior.

In Examples 2 to 4 of the present invention, the blended ratio of the dyed para-aramid fiber in the spun yarn was high, the coatability of the polyester fiber was good, and the para-aramid fiber dyed on the surface of the yarn or woven fabric was used. It exhibited the functional characteristics of the covering para-aramid fiber and was good in that it also had shape retention properties such as pleating properties.

[0074]

[Table 2]

[Examples 5 and 6] As a short fiber bundle of a sheath component, a para-aramid short fiber dyed in dark blue having a fineness of 1.5 d and a fiber length of 38 mm according to the present invention and a fineness of 1.5 d were used. A blend of 50-50% (Example 5) blend of original meta-aramid staple fibers [DuPont "Nomex" (registered trademark of DuPont)] colored 38 mm dark blue of cotton spinning method, to create a roving of thickness 0.3 g / m, likewise polyester staple fiber 100% example 2 were combined machining as a core component rovings 0.3 g / m 15 ^S, A spun yarn with K = 3.5 was obtained.
Further, the dyed para-aramid short fibers of Example 5 were
Change the fineness of 5d, the fiber length to 89mm, and the original meta-aramid short fiber to 1.5d and the fiber length to 76mm, and blend each with a ratio of 50/50% (Example 6). Composite processing was performed using 100% short fibers and a roving of 0.3 g / m as a core component to obtain a spun yarn of 15 ^S , K = 3.5. A plain woven fabric was prepared in the same manner as in Example 2, and the cloth was evaluated. The results are shown in Table 2.

In Example 6 in which the single fiber denier of the dyed para-aramid fiber was set to 5 denier, the dyeing degree L value was 4
It has good dyeing properties as low as 7.6, and has good heat resistance, functional properties such as cut resistance, and good shape retention such as pleating properties. However, poor weaving due to poor warp shedding makes the fabric rough and hard, making it a protective clothing. Was somewhat inferior. "Kevlar" and "Nomex" fineness 1.5d, fiber length 38 as sheath component
Example 5 in which each fiber was blended at a ratio of 50/50%.
Is fully aromatic polyamide fiber, exhibiting high-performance properties such as cut resistance and heat resistance, and has good L value of 48.5, good dyeability, rich color and colorfulness, and pleated properties. The fabric was also excellent in holding properties, and was soft and flexible, and was suitable for sports clothing and protective clothing. [Examples 7 to 8] The core, the sheath component fiber, the blending ratio, and the compounding method were the same as those in Example 2, and the twist coefficient was K = 2.5 (9.
7T / in), K = 6.2 (24.0 T)
/ In), a twist coefficient K =
In Example 7 of 2.5, in the composite processing of the core and the sheath, the cohesion of the core and the sheath was poor and the operability was reduced due to separation. K =
In Example 6.2 of 6.2, the occurrence of double twist sometimes occurred in the composite processing in the spinning process. [Example 9-10, Comparative Example 5] 15 ^S composite yarn 25% of the total weight fabric of Example 2 (Comparative Example 5), of 30% (Example 9), 100% (Example 10) Like warp,
A plain weave was prepared by uniformly using the weft. T65% cotton 35% dyed in dark blue as base yarn, 1
Silospan yarn having 5 ^S and K = 3.4 was twisted at 90 ° C. for 20 minutes and used. A sizing agent was applied to the warp during weaving. The weaving density is 78 warps / in and 65 wefts / in.
With a woven width of 98 cm. Table 3 shows the evaluation results of the cloth.

Comparative Example 5 using 25% of the yarn of the present invention had good shape retention properties such as pleating properties, but was inferior in high-performance properties of wholly aromatic polyamide fibers such as heat resistance and cut resistance. . Example 9 and Example 10 are excellent fabrics which fully exhibit the high-performance properties of the wholly aromatic polyamide fiber, have an L value of 46.8, have good dyeing properties, and also have form retention properties such as pleating properties. there were.

Further, the fabrics of Example 9 and Example 10 were tailored into slacks, and the tailoring prosperity was evaluated by visual inspection. As a result of the wearing evaluation performed by 10 persons, the pleat retention as well as the heat resistance and the cut resistance were good, and the evaluation was favorable.

[0079]

[Table 3]

[0080]

As described above, the core-sheath type composite spun yarn and fabric of the present invention comprise a polyester short fiber constituting a core portion or a short fiber bundle comprising a polyester short fiber blended yarn, and a yarn forming a sheath portion. By coating with the dyed para-aramid fiber of the present invention, or a wholly aromatic polyamide short fiber bundle containing the dyed para-aramid fiber and meta-aramid fiber, the cut resistance and heat resistance of the wholly aromatic polyamide fiber Protective clothing that requires highly functional properties by greatly improving the dyeing properties, pleating properties, wrinkle resistance, and form retention that are the drawbacks of wholly aromatic polyamide fibers without compromising excellent high-performance properties such as properties. The present invention can provide a colorful and suitable fabric for use fields and sports clothing.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a spinning machine for producing a core-sheath composite spun yarn of the present invention.

[Explanation of symbols]

 A, B: short fiber bundle 1a, 1b: trumpet 2: back roller 3: apron raft 4a, 4b: tapered front roller 5: core-sheath composite spun yarn 6: ring 7: traveler 8: yarn tube

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D04B 1/16 D04B 1/16 (72) Inventor Takeshi Hatano 3-4-1-18 Nakanoshima, Kita-ku, Osaka-Toray・ DuPont Co., Ltd. Osaka Head Office (72) Inventor Yuriko Toyomura 1-1-1, Oe, Otsu City, Shiga Prefecture F-term in Toray Industries, Inc. Seta Plant (Reference) 4L002 AA06 AB01 AC06 DA04 FA01 4L036 MA05 MA06 MA08 MA35 PA31 PA33 RA25 UA16 UA25 4L048 AA25 AA48 AA53 AB00 AB05 AC07 AC09 BA01 BA02 CA01 CA06 CA14 DA01 DA03

Claims (11)

[Claims] 1. A core / sheath type composite spun yarn, wherein a sheath component containing at least a dyed wholly aromatic polyamide short fiber is 50%.
And at least 30 to 50% by weight of a core component containing polyester short fibers, and the ratio of the dyed wholly aromatic polyamide short fibers to the spun yarn is 50 to 90% by weight. %, And the ratio of the polyester short fiber to the spun yarn is 10 to 35% by weight. 2. The core-sheath composite spun yarn according to claim 1, wherein the wholly aromatic polyamide short fiber dyed in the sheath component is a para-aramid short fiber. 3. The core / sheath according to claim 1, wherein the wholly aromatic polyamide short fibers of the sheath component are a blend of dyed para-aramid short fibers and meta-aramid short fibers. Type composite spun yarn. 4. The core-sheath composite spinning according to claim 2, wherein the para-aramid short fibers dyed in the sheath component are polyparaphenylene terephthalamide (PPTA) short fibers. yarn. 5. The dyed para-aramid short fiber accounts for 25 to 90% by weight of the spun yarn, and the meta-aramid short fiber accounts for 60% by weight or less of the spun yarn. Item 4. A core-sheath composite spun yarn according to item 3. 6. A fiber according to claim 1, characterized in that the core component is a blend of less than 20% by weight of a wholly aromatic polyamide short fiber dyed and a sheath component of 25 to 50% by weight of a meta-aramid short fiber.
6. The core-sheath composite spun yarn according to any one of items 5 to 5. 7. A mixed yarn comprising 100% by weight of a polyester short fiber or a polyester short fiber and a fiber selected from at least one of a dyed wholly aromatic polyamide short fiber, a natural fiber and a cellulosic fiber. The core-sheath composite spun yarn according to any one of claims 1 to 6, characterized in that: 8. A para-aramid staple fiber is prepared by spinning dope from PPTA having an intrinsic viscosity IV (ηinh) of 5 or more and concentrated sulfuric acid, and the dope is once spun into the air through pores of a spinneret. Immediately lead to water and solidify, high strength,
A step of forming a filament having a high elastic modulus, a step of forming a staple by cutting the filament by crimping the filament,
In a method in which the step of dyeing the filament is performed in a separate step without being continuous, the tensile strength of the para-aramid fiber before dyeing is 15 g / d or more and the crystal size (11
The core-sheath type according to any one of claims 2 to 7, wherein (0 direction) is 30 to 55 angstroms and the water content before dyeing is always maintained at 8% or more. Composite spun yarn. 9. A dyed para-aramid short fiber or a dyed para-aramid short fiber and a meta-aramid short fiber having a single fiber fineness of 0.5 to 4.5 denier and a twist coefficient K of 2 The core-sheath composite spun yarn according to any one of claims 2 to 8, which has a viscosity of from 0.8 to 6.0. 10. A fabric comprising the core-sheath composite spun yarn according to claim 1 in an amount of 30 to 100% by weight of the fabric. 11. The fabric according to claim 10, which is used for clothing for outdoor sports or protective clothing.