JP2009209488A - Composite spun yarn, and woven or knitted fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new composite spun yarn capable of imparting not only functional characteristics such as strength and flame retardance but also sensibility characteristics such as aesthetic properties and touch feeling to a woven or a knitted fabric, and to provide the woven or the knitted fabric using the composite spun yarn. <P>SOLUTION: The composite spun yarn includes a core component composed of para-based aramid fibers and meta-based aramid fibers and a sheath component composed of cellulose fibers in a composite ratio of the core component/sheath component within the range of (25/75) to (55/45). Furthermore, the woven or the knitted fabric is obtained by using the composite spun yarn. The new composite spun yarn capable of improving not only the functional characteristics such as the strength and the flame retardance but also the sensibility characteristics such as the aesthetic properties and the touch feeling to the woven or the knitted fabric can be provided. The woven or the knitted fabric using the composite spun yarn can also be provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a composite spun yarn excellent in strength and flame retardancy, and a woven or knitted fabric using the same.

  Conventionally, aromatic polyamide fibers have been widely used for functional woven and knitted fabrics. Aromatic polyamide fibers are roughly classified into para-aramid fibers and meta-aramid fibers, and are widely distributed under various trade names. Aromatic polyamide fibers are generally used as filament yarns for industrial materials because of their excellent strength, flame retardancy, heat resistance, and chemical resistance. Many examples have been applied to clothing mainly intended to protect the fabric, and at that time, use as a spun yarn has been proposed as a means for improving wearing comfort.

  For example, Patent Document 1 discloses a blended yarn containing a para-aramid fiber, a meta-aramid fiber, and a flame-retardant polyethylene terephthalate short fiber in a specific ratio.

  Para-aramid fibers generally have a drawback that they are difficult to dye due to their molecular structure. The difficulty of dyeing is a major factor that hinders application to clothing applications. However, in the blended yarn, a buckled portion is formed in the para-aramid fiber by means such as indentation crimping, and this buckled portion is dyed with a non-carrier, so the entire blended yarn is dyed with good color development. be able to.

Patent Document 2 discloses a core-sheath type composite spun yarn in which polyester fiber is disposed as a core component and para-aramid fiber is disposed as a sheath component. In this spun yarn, the polyester fiber is arranged in the core component to complement the defects of the aramid fiber, which is inferior in shape retention, and the para-aramid fiber is arranged in the sheath component, so that cut resistance and heat resistance are achieved. Complements the disadvantages of inferior polyester fibers. As a result, if this spun yarn is used, it is possible to provide a woven or knitted fabric suitable for use in protective clothing or outdoor clothing that requires high performance characteristics.
Japanese Patent Laying-Open No. 2003-201643 (Example 1, paragraph [0024]) Japanese Patent No. 3954231 (Example 1, paragraphs [0017] and [0048])

  Since aromatic polyamide fibers have various functionalities, it was mentioned earlier that they are now being applied not only to industrial materials but also to clothing applications such as protective clothing. In addition to functional properties such as flame retardancy, improvements in sensibility properties such as aesthetics and texture are also required.

  As one means of improving aesthetics, it is known to make the color emitted by the woven or knitted fabric vivid, and if the blended yarn according to Patent Document 1 is used, a woven or knitted fabric having excellent color developability is surely obtained. I can. However, such a woven or knitted fabric is limited to a single color because it is intended to provide a vivid color by dyeing. However, it is not possible to further improve the aesthetics of the woven or knitted fabric by adding a printed pattern or the like, for example, and a drastic improvement is desired.

  Further, the composite spun yarn according to Patent Document 2 can impart various functional properties to the woven or knitted fabric due to its unique structure. However, since the spun yarn has aramid fibers arranged on its surface, it tends to strongly reflect the rigidity of the fibers in the woven or knitted fabric, and as a result, the texture of the woven or knitted fabric is significantly impaired. There's a problem.

  The present invention eliminates the disadvantages of the prior art as described above, and is a novel composite that can impart not only functional properties such as strength and flame retardancy but also sensibility properties such as aesthetics and texture to the woven or knitted fabric. It is a technical problem to provide a spun yarn and a woven or knitted fabric using the spun yarn.

  As a result of intensive studies to solve the above problems, the present inventors can impart excellent functions and sensitivities to the woven or knitted fabric by arranging an aramid fiber as the core component and a cellulose fiber as the sheath component. Knowing that a spun yarn can be obtained, the present invention has been achieved.

  That is, the present invention is a composite spun yarn in which the core component is composed of para-aramid fiber and meta-aramid fiber, and the sheath component is composed of cellulose fiber, and the composite ratio of the core component / sheath component is 25/75 to 55. The subject matter is a composite spun yarn characterized by being in the range of / 45, and the subject matter is a woven or knitted fabric using the composite spun yarn.

  According to the present invention, a novel composite spun yarn capable of imparting not only functional characteristics such as strength and flame retardancy but also sensibility characteristics such as aesthetics and texture to the woven or knitted fabric, and a woven or knitted fabric using the same. Can be provided.

  Hereinafter, the present invention will be described in detail.

  In the present invention, para-aramid fibers and meta-aramid fibers are used as aramid fibers. Both fibers are commercially available. For example, as para-aramid fibers, “Technora (trade name)”, “Twaron (trade name)” manufactured by Teijin Techno Products Co., Ltd., “Toray DuPont” “Kevlar (trade name)”, etc. As meta-based aramid fibers, “Conex (trade name)” manufactured by Teijin Techno Products Ltd., “Nomex (trade name)” manufactured by DuPont, etc. can be used.

  When para-aramid fibers and meta-aramid fibers are compared, both have many common characteristics, but generally the former is excellent in strength and elastic modulus, and the latter is excellent in flame retardancy and heat resistance. Considering this point, in the present invention, it is necessary to use both aramid fibers in order to make maximum use of the properties of aramid fibers. Specifically, the range of 25/75 to 55/45 is preferable as the composite ratio of para-aramid fiber / meta-aramid fiber. In the use of aramid fibers, if the composite ratio is not satisfied, the characteristics of only one aramid fiber are strongly reflected in the woven or knitted fabric, which is not preferable.

  The mixed form of both aramid fibers is not particularly limited, but in consideration of the flame retardancy of the spun yarn, it is mixed, or a para-aramid fiber on the inside and a meta-aramid fiber on the outside to form a two-layer structure. The above-mentioned form can be preferably adopted.

  Furthermore, in this invention, a cellulose fiber is used with an aramid fiber. As the cellulose fibers, for example, natural cellulose fibers such as cotton and hemp, and regenerated cellulose fibers such as viscose rayon and solvent-spun cellulose fibers can be used. Of these, cellulose fibers having flame retardancy can be preferably used in consideration of the use of spun yarn. Examples of the cellulose fiber having flame retardancy include regenerated cellulose fiber containing a flame retardant containing a phosphorus compound as a main component inside the fiber. This regenerated cellulose fiber can be easily obtained by applying the existing viscose method. For example, if a known wet spinning is performed by adding a flame retardant for the spinning solution, a desired fiber can be easily obtained.

  The spun yarn of the present invention comprises the aramid fiber and cellulose fiber described above.

  As a result of various investigations on the arrangement of the fibers in the spun yarn, the present inventors have found that the aramid fibers are arranged in the core component and the cellulose fibers are arranged in the sheath component. It has been found that the excellent sensitivity characteristics of the fibers can be easily reflected in the woven or knitted fabric. This is because the fiber arranged on the surface of the spun yarn (sheath component) has many opportunities to come into contact with the outside, and the fiber arranged in the center portion (core component) of the spun yarn is deeply related to the yarn quality. In particular, it has also been found that this effect can be drastically improved by setting the composite ratio of the core component / sheath component within a specific range.

  That is, in the spun yarn of the present invention, the composite ratio of the core component / sheath component needs to be in the range of 25/75 to 55/45. When the amount of aramid fibers to be distributed to the core component is less than this range, the functional properties such as the strength and flame retardancy of the spun yarn and the woven / knitted fabric are reduced, while the cellulose fiber to be distributed to the sheath component is reduced. When the amount is less than the range, the dyeability is reduced in addition to the sensibility characteristics such as aesthetics and texture of the woven or knitted fabric.

  Since the spun yarn of the present invention has the above-described configuration, not only functional characteristics such as strength and flame retardancy but also sensibility characteristics such as aesthetics and texture can be imparted to the woven or knitted fabric. In this regard, with respect to functional characteristics, it is preferable that the spun yarn itself has appropriate characteristics in order to impart desired characteristics to the woven or knitted fabric. Accordingly, the strength of the spun yarn is preferably 11000 cN or more, and the flame retardance is preferably LOI value of 28 or more. On the other hand, as for the sensibility characteristics, from the viewpoint of improving aesthetics, it is preferable that the woven or knitted fabric can be dyed as well as printed. Printing may not only improve the aesthetics of the woven or knitted fabric, but may also impart new characteristics other than aesthetics. For example, if an IR camouflage print is attached to a woven or knitted fabric, the woven or knitted fabric can be applied to fake clothing. As for the texture of the woven or knitted fabric, the soft and stretchy texture produced by cellulose fibers is basically preferable, but if the characteristics of the rigid aramid fibers are utilized, the texture is full of a refreshing and refreshing feeling. It is also a preferable texture when used as summer clothing.

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

  The spun yarn of the present invention can be produced by applying a known composite spinning method. For example, a sliver made of aramid fiber and a sliver made of cellulose fiber are prepared, and the former is roasted so that the latter is placed on the core side and the latter is placed on the sheath side, and then finely spun, or the sliver made of aramid fiber is used. A target spun yarn can be obtained by preparing a yarn and a roasted yarn made of cellulose fiber and finely spinning the former so that the former is arranged on the core side and the latter on the sheath side.

  The twisting factor at the time of fine spinning is preferably 2.5 to 5.5. If the twisting factor is out of this range, the strength of the spun yarn tends to be reduced.

  The spun yarn of the present invention can be used not only as a single yarn but also as a combined yarn. Specifically, the yarn can be used as a twisted yarn, a finely spun yarn, or a covering yarn, and the number of yarns to be combined is not particularly limited, but practically 2 or 3 is preferable. Moreover, as long as the effect of the present invention is not impaired, a yarn other than the spun yarn of the present invention may be employed as the yarn to be combined.

  The number of twists in the case of combined yarns may be set basically arbitrarily as long as the form of the combined yarns can be maintained, but preferably the upper twist number is 0.65 to 1.15 of the lower twist number. Set to about double. When the number of upper twists is less than 0.65 times the number of lower twists, it tends to be difficult to realize a fresh and refreshing texture per texture of the woven or knitted fabric, which is not preferable. On the other hand, if it exceeds 1.15 times, not only does the strength of the spun yarn tend to decrease, but the cellulose fiber contained in the spun yarn will turn yellow as the temperature of the twist set is set higher. This is not preferable.

  Hereinafter, the present invention will be specifically described by way of examples. Each measurement was according to the following method.

1. Strength of spun yarn The strength of spun yarn was evaluated by calculating the product of positive count and single yarn tensile strength (single yarn count strength product). The positive count was measured according to JIS L1095 9.4.1, and the single yarn tensile strength was measured according to JIS L1095 9.5.1 (constant speed extension type, gripping interval 50 cm).

2. Flame retardancy of spun yarn The flame retardancy of spun yarn was evaluated by measuring the limiting oxygen index (LOI value) according to JIS L1091 8.5E method (oxygen index method test).

Example 1
Sliver A made of para-aramid fiber (“Technola FRL (trade name)” manufactured by Teijin Techno Products Co., Ltd.) with a single yarn fineness of 1.7 dtex and a fiber length of 51 mm, and a meta with a single yarn fineness of 1.7 dtex and a fiber length of 51 mm Sliver B made of aramid fiber (“Conex T330 (trade name)” manufactured by Teijin Techno Products Co., Ltd.), and regenerated cellulose fiber (manufactured by Lenzing Co., Ltd., “MATT (trade name) ) ") And sliver C. The sliver mass ratio (A: B: C) was 20:30:50.

  Next, sliver B is wound around sliver A and sliver C is wound around sliver B by simultaneously introducing the above three slivers into the roving machine and adjusting the amount of sliver spun from the front roller. A roving yarn having a thickness of 16.23 gr / 30 yd and a twist number of 0.9 times / 2.54 cm was obtained.

  Subsequently, the obtained roving yarn was introduced into a spinning machine and drafted at 28.6 times. The thickness was 27 (English cotton count), the twist coefficient was 4.3 (twist direction Z-twist, twist number 22.3). Times / 2.54 cm) composite spun yarn was obtained.

(Example 2)
A blended sliver D obtained by mixing equal amounts of para-aramid fibers and meta-aramid fibers used in Example 1 and sliver E composed of regenerated cellulose fibers used in Example 1 were prepared. The sliver mass ratio (D: E) was 30:70.

  Next, the above two slivers are simultaneously introduced into the roving machine, and the sliver E is wound around the sliver D by adjusting the amount of sliver spun from the front roller, and the thickness is 16.23 gr / 30 yd, A roving with a twist number of 0.9 times / 2.54 cm was obtained.

  Subsequently, the obtained roving was spun under the same conditions as in Example 1, and had a thickness of 27 (English cotton count) and a twist coefficient of 4.3 (twist direction Z twist, twist number 22.3 times / 2). .54 cm) composite spun yarn was obtained.

(Comparative Example 1)
A sliver obtained by sequentially mixing the para-aramid fiber, meta-aramid fiber and regenerated cellulose fiber used in Example 1 at a mass ratio of 20:30:50 was introduced into a roving machine, and the thickness was 16.23 gr / 30 yd. A roving with a twist number of 0.9 times / 2.54 cm was obtained.

  Subsequently, the obtained roving was spun under the same conditions as in Example 1, and had a thickness of 27 (English cotton count) and a twist coefficient of 4.3 (twist direction Z twist, twist number 22.3 times / 2). .54 cm) spun yarn was obtained.

(Comparative Example 2)
A blended sliver F formed by mixing equal amounts of para-aramid fibers and meta-aramid fibers used in Example 1 and sliver G composed of regenerated cellulose fibers used in Example 1 were prepared. The sliver mass ratio (F: G) was 20:80.

  Next, the above two slivers are simultaneously introduced into the roving machine, and the sliver G is wound around the sliver F by adjusting the amount of sliver spun from the front roller, and the thickness is 16.23 gr / 30 yd, twisted A roving of several 0.9 times / 2.54 cm was obtained.

  Subsequently, the obtained roving was spun under the same conditions as in Example 1, and had a thickness of 27 (English cotton count) and a twist coefficient of 4.3 (twist direction Z twist, twist number 22.3 times / 2). .54 cm) composite spun yarn was obtained.

(Comparative Example 3)
A blended sliver H formed by mixing equal amounts of para-aramid fibers and meta-aramid fibers used in Example 1 and Sliver I composed of regenerated cellulose fibers used in Example 1 were prepared. The sliver mass ratio (H: I) was 60:40.

  Next, the above two slivers are simultaneously introduced into the roving machine, and the sliver I is wound around the sliver H by adjusting the amount of sliver spun from the front roller, and the thickness is 16.23 gr / 30 yd, twisted A roving of several 0.9 times / 2.54 cm was obtained.

  Subsequently, the obtained roving was spun under the same conditions as in Example 1, and had a thickness of 27 (English cotton count) and a twist coefficient of 4.3 (twist direction Z twist, twist number 22.3 times / 2). .54 cm) composite spun yarn was obtained.

  The composite spun yarn and the blended yarn obtained above were each used alone as a warp and weft to produce a twill fabric, and a camouflage print was applied to one side of the twill fabric using a dye. The camouflage print processing conditions were the same for each twill fabric.

  In addition to the evaluation of the spun yarn, Table 1 shows the evaluation results for the aesthetics and texture of the twill fabric. The aesthetics of the twill fabric was visually evaluated in three stages from ○ (excellent) to x (inferior) based on the clearness of the camouflage print, and the texture was also sensorially evaluated in three stages based on the touch feeling. .

  As is apparent from Table 1, the spun yarns obtained in Examples 1 and 2 were excellent in strength and flame retardancy, and the fabric using these yarns was also excellent in aesthetics and texture.

  On the other hand, since the spun yarn obtained in Comparative Example 1 was obtained by blending, aramid fibers were observed all over the surface of the yarn, although not all. As a result, the printed pattern could not be sufficiently fixed to the twill fabric, and the twill fabric was inferior in aesthetics. Moreover, as for the texture of the twill fabric, a lot of aramid fibers were similarly arranged on the surface of the spun yarn, resulting in a lack of softness.

In the spun yarn obtained in Comparative Example 2, the amount of aramid fibers contained in the spun yarn was small, so that the strength and flame retardancy were inferior. The aesthetics and texture were good. Furthermore, in the twill woven fabric obtained in Comparative Example 3, the amount of cellulose fibers contained in the spun yarn is small, and as a result, the printed pattern is slightly insufficiently fixed to the twill woven fabric surface. Slightly lacking. Regarding the texture, similarly, the amount of cellulose fiber used was small, resulting in lack of softness.

Claims (2)

  A composite spun yarn in which the core component is composed of para-aramid fiber and meta-aramid fiber, and the sheath component is composed of cellulose fiber, and the composite ratio of the core component / sheath component is in the range of 25/75 to 55/45. Composite spun yarn characterized by that. A woven or knitted fabric using the composite spun yarn according to claim 1.