JP5819735B2 - Mixed yarn excellent in cool feeling - Google Patents

Description

  The present invention relates to a mixed fiber excellent in cooling feeling. More specifically, the present invention relates to a blended yarn having an atypical cross-section fiber excellent in cooling feeling that can be suitably used for clothing as a sheath yarn, which is excellent in comfort and texture when worn in summer. .

Along with the recent increase in comfort orientation, textile products have been developed that, when worn as clothes, can feel a moderate cool feeling, especially when the ambient environmental temperature is relatively high, such as in summer.
For example, a polymer using a hygroscopic polymer (Patent Document 1), a polymer using a thermoplastic elastomer (Patent Document 2), and inorganic particles having excellent thermal conductivity are kneaded. Something has been proposed.

However, hygroscopic polymers cause stickiness during sweating and cause discomfort, and elastomers have inferior processing characteristics such as low dyeing fastness in addition to their own tackiness.
Moreover, although the technique which adheres the substance which has a cool feeling by post-processing after forming a fabric is also disclosed (patent documents 3 and 4), the adhesion by post-processing is the deterioration of the texture by the binder used as an adhesive agent. There was a problem of washing durability.

On the other hand, a water-absorbent mixed fiber using a fiber having a flat cross section as a sheath thread has been proposed (Patent Document 5). The mixed yarn is intended to reduce the feeling of stickiness by reducing the chance that the core that retains the moisture transferred through the gaps in the fibers of the flat cross section will come into contact with the skin. This method is not different from the method using the hygroscopic polymer in that processing is employed.
As described above, in the conventional method, a mixed yarn having sufficient cooling feeling, workability, and durability is not obtained, and improvement thereof is desired.

JP 2003-293223 A JP 2004-270075 A JP 2007-224429 A JP 2006-161226 A JP 2004-11069 A

  An object of the present invention is made in the background of the above-described conventional technology, and the object is to provide a mixed yarn having excellent contact cooling feeling and texture when made into a fabric and excellent in workability. .

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have determined that the above object can be achieved by specifying the fibers constituting the core and the sheath in the core-sheath blended yarn. And the present invention has been reached.

That is, according to the present invention, a blended yarn having a core-sheath structure, comprising high-density polyethylene as a main constituent, and fibers satisfying the following requirements (1) to (4) at the same time: sheath yarn, polyester, polyamide A blended yarn excellent in cooling sensation is provided, wherein a core yarn is a fiber mainly composed of at least one fiber-forming polymer selected from polyolefins.
(1) The shape of the cross-section perpendicular to the fiber axis of the fiber is a flat shape, and the cross-section single yarns are linearly connected in the longitudinal direction of the cross-section, and have 2 to 5 constricted portions.
(2) The ratio A / B1 between the long axis width A of the flat cross section and the short axis maximum width B1 perpendicular thereto is 2-6.
(3) The ratio B1 / B2 between the short axis maximum width B1 of the flat cross section and the short axis minimum width B2 corresponding to the constriction is 1.05 or more and 1.6 or less.
(4) The single yarn fineness is 0.1 to 10 dtex and the strength is 1.5 cN / dt or more.

  ADVANTAGE OF THE INVENTION According to this invention, when it is set as a fabric, the mixed fiber yarn excellent in workability which can express the feeling of contact cooling and the texture which are excellent can be provided.

(A) It is a schematic diagram which shows an example of the cross section orthogonal to the fiber axis of the single fiber which comprises a sheath yarn of the mixed fiber of this invention. (B) It is a schematic diagram which shows the other example of the cross section orthogonal to the fiber axis of the single fiber which comprises a sheath yarn of the mixed fiber of this invention.

Hereinafter, embodiments of the present invention will be described in detail.
The blended yarn of the present invention needs to use what has polyethylene as a main constituent as a sheath yarn. The polyethylene is large and is classified into high-density polyethylene, linear low-density polyethylene, and low-density polyethylene, and among these, high-density polyethylene is preferable because it has good yarn production and high thermal conductivity.

The polyethylene preferably comprises a single component, but C3-C12 higher alkenes may be included as a copolymer in a proportion of less than 5% by weight.
The shape of the cross-section orthogonal to the fiber axis of the single fiber of the sheath yarn is not particularly limited, but when the cross-sectional shape is a flat shape, the contact area with the skin is effectively increased when the cloth for clothing is used. It is preferable because it is possible to feel a feeling of cool contact.

  The ratio A / B1 between the long axis width A of the flat cross section and the short axis maximum width B1 perpendicular thereto is preferably 2 to 10. If the ratio A / B1 of the width A of the major axis and the maximum width B1 of the minor axis perpendicular to it is less than 2, it becomes close to a round cross section and the effect of the flat shape is reduced, while if it exceeds 10, the effect of the flatness is reduced. In addition to the above, the process stability during yarn production may be reduced. A particularly preferred range is 3-8.

  Furthermore, the cross-sectional shape of the single fiber of the fiber that becomes the sheath yarn is a shape in which round cross-section single yarns are linearly connected in the longitudinal direction of the cross section, and a shape having 2 to 5 constricted portions is more preferable. The circular cross-section single yarns are linearly connected and the overall flat cross-sectional shape reduces the space between the single yarns compared to the case where the single round cross-section yarns exist alone, effectively expressing the cooling effect. In addition, the bending properties of the fibers are improved, and the fabric is rich in flexibility.

  Furthermore, the cross-sectional shape of the single fiber of the fiber that becomes the sheath yarn is not a mere flat shape, but has a constricted part, for example, irregular reflection on the fiber surface and light refraction without excessively relying on the reflection of inorganic compound particles. It is possible to enhance the effect and impart a certain degree of permeation resistance. If the number of constricted portions is less than 2, the above effect is difficult to obtain, and conversely if the number of constricted portions exceeds 5, it is not preferable in terms of process stability.

  In the case where the round cross-section single yarns are linearly connected, the ratio A / B1 between the long axis width A of the flat cross section and the short axis maximum width B1 perpendicular thereto is preferably 2-6. When the flatness ratio is less than 2, the effect of the flat cross section is difficult to obtain, and when a fabric such as a woven or knitted fabric is used, the long axes are difficult to be arranged parallel to the fabric surface, and the heat shielding property is lowered. On the other hand, if the flatness exceeds 6, the spinning stability is lowered, so a more preferable range is 3-5.

  Further, in the case where the round cross-section single yarns are linearly connected, the ratio B1 / B2 between the shortest maximum width B1 of the flat cross section and the shortest axis minimum width B2 corresponding to the constricted portion is 1.05 or more and 1 .6 or less is preferable. When B1 / B2 is less than 1.05, the effect of connecting the above-described round cross-sections decreases, and when B1 / B2 exceeds 1.6, the thickness of the connecting portion (necked portion) becomes thin, and the cooling sensation effect. Decreases. A preferred range is 1.1 to 1.4.

The single yarn fineness of the sheath yarn used for the blended yarn of the present invention is preferably 1 to 10 dtex. When the single yarn fineness is less than 0.1 dtex, the spinning stability is lowered, and the fine voids between the fibers are increased, the heat insulation between the fibers is increased, and the cooling effect may be reduced. On the other hand, when the single yarn fineness exceeds 10 dtex, when the knitted fabric is used, the inter-fiber distance is increased, the contact area is decreased, the contact cooling effect is lowered, and the texture may be hardened. The single yarn fineness is more preferably 0.5 to 8 dtex.
The strength of the sheath yarn is preferably 1.5 cN / dt or more. If the strength is less than 1.5 cN / dt, the durability is poor.

  The fiber used as the core yarn in the blended yarn of the present invention must contain at least one fiber-forming polymer selected from polyester, polyamide, and polyolefin as a main constituent, and any of these If it is, there will be no limitation in particular.

  Among polyesters, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, or the like, or a main repeating unit thereof, aromatic dicarboxylic acid such as isophthalic acid or 5-sulfoisophthalic acid metal salt, adipic acid or A copolymer with an aliphatic dicarboxylic acid such as sebacic acid, a hydroxycarboxylic acid condensate such as ε-caprolactone, or a glycol component such as diethylene glycol, trimethylene glycol, tetramethylene glycol or hexamethylene glycol is preferred.

Moreover, among polyamides, aliphatic polyamides such as nylon 6 and nylon 66 can be cited as preferred examples. On the other hand, among polyolefins, high-density polyethylene, medium-density polyethylene, high-pressure low-density polyethylene, linear low-density polyethylene, isotactic polypropylene, ethylene-propylene copolymer, ethylene copolymer of vinyl monomers such as maleic anhydride Etc. can be mentioned as a preferable example.
The cross-sectional shape of the core yarn can be any shape depending on the application and the like. For example, other than a circular shape, a modified cross-section such as a triangle, a flat shape, a star shape, and a V shape can be exemplified.

  Both the sheath yarn and the core yarn constituting the blended yarn of the present invention are optional additives as long as they do not impair the purpose of the present invention, such as catalysts, anti-coloring agents, heat-resistant agents, flame retardants, fluorescent enhancements. Whitening agents, matting agents, coloring agents and the like may be included.

  As a method for spinning the sheath yarn and the core yarn constituting the blended yarn of the present invention, a known method may be used, but the melt spinning method is preferable in terms of cost and preferable. As the stretching method, known hot roll stretching or warm water stretching can be used. For the sheath yarn and the core yarn, known antistatic agents, fiber finishing agents, and the like can be appropriately used as necessary in the process of spinning and stretching the fibers.

  The blended yarn of the present invention can be obtained by blending fibers containing polyethylene as a main component and fibers serving as a core yarn by a conventionally known method. For example, the core yarn and the sheath yarn can be drawn together and air-entangled to give a mixed yarn. In this case, it is preferable that the usage ratio of both is core yarn: sheath yarn = 25: 75 to 75:25 in weight ratio.

As a method of air entanglement processing, either interlace or taslan processing may be used. Moreover, it does not need to perform heat processing at the time of blended yarn preparation.
When the fiber of the present invention is used as a fabric, it may be used for all fabrics or partially. The structure is not particularly limited, and may be a woven fabric, a knitted fabric, or a non-woven fabric.

  Next, the present invention will be described more specifically with reference to examples. The evaluation and measurement in the examples were performed as follows.

(1) Fiber cross-sectional shape From the cross-sectional photograph of the fiber with a magnification of 500 times, the values of A, B1, and B2 are measured for 20 single yarns serving as sheath yarns, and the flatness is calculated from the average value. The values of A / B1 and B1 / B2 were calculated.

(2) Tensile strength of fiber Measurement was performed in accordance with the method described in JIS L1070.

(3) Evaluation of cooling feeling of contact Using the obtained mixed yarn, a cylindrical knitting with a basis weight of 150 g / m ² was made, and the presence or absence of cooling feeling at the moment when 10 subjects touched the fabric was evaluated according to the following criteria. The average score of 10 people was obtained and evaluated.
3 points: 2 points that felt a cool feeling clearly felt 1 point that felt a little cold feeling 0 points that felt a slight cooling feeling 0: no feeling of cooling at all Also, the fabric was 8cm x 8cm in size Then, it was placed on a stainless steel plate having a size of 10 cm × 10 cm and heated to 40 ° C. and having a thickness of 0.5 mm, the temperature at the center of the stainless steel plate was measured with a thermocouple, and the maximum temperature drop was measured and evaluated.

Example 1
High-density polyethylene (melt flow rate according to JIS K-7210; 19) was melted with an extruder set at 230 ° C., and discharged from a die having a 36-hole round cross section at a temperature of 240 ° C. at a spinning speed of 1500 m / min. Winded up. The wound undrawn yarn was drawn under the conditions of a preheating temperature of 90 ° C., a heat setting temperature of 120 ° C. and a draw ratio of 4.0 times, and 44 dtex / 36 fils. The drawn yarn (a) was obtained without problems in the process.
On the other hand, polyethylene terephthalate having an intrinsic viscosity of 0.64 (35 ° C. in orthochlorophenol) copolymerized with 10 mol% of isophthalic acid was dried to a moisture content of 70 ppm or less and then melted in an extruder at a melting temperature of 285 ° C. Then, it was discharged from a die having 12 circular discharge holes and taken up at a spinning speed of 1100 m / min to obtain an undrawn yarn.
This undrawn yarn was drawn at a preheating temperature of 90 ° C. and a draw ratio of 3.25 times, and was not heat-set. The drawn yarn (A) obtained above was used as the drawn yarn (A). ) Was entangled with a known interlace nozzle at a pneumatic pressure of 0.15 MPa so as to obtain a core yarn, and a mixed yarn consisting of 48 yarns of 78 dtex was obtained.
The obtained blended yarn had a strength of 2.9 cN / dtex, and two obtained blended yarns were combined to create a tubular knitting, and the cooling feeling was evaluated. The maximum temperature drop was −2 ° C. compared to Comparative Example 1, and a sufficient cooling sensation could be felt.

Comparative Example 1
In Example 1, instead of the drawn yarn (a), polyethylene terephthalate having an intrinsic viscosity of 0.64 was melted by an extruder at a melting temperature of 285 ° C., and discharged from a die having 36 circular discharge holes. The yarn was taken up at a speed of 1100 m / min to obtain an undrawn yarn.
A blended yarn was obtained in the same manner as in Example 1 except that this undrawn yarn was drawn at a preheating temperature of 90 ° C. and a draw ratio of 3.25 times, was not heat-set, and was used as a drawn yarn (A). The obtained mixed fiber had a strength of 3.5 cN / dt, and even in sensory evaluation, it was 0.2 points, and a feeling of cooling was hardly felt.

Comparative Example 2
In Example 1, instead of the drawn yarn (a) of the sheath yarn, polypropylene (melt flow rate according to JIS K-7210; 60) was used and discharged from a die having 36 round cross-sections at a temperature condition of 225 ° C. Winding was performed at a spinning speed of 1000 m / min. The wound undrawn yarn was drawn under the conditions of a preheating temperature of 70 ° C., a heat setting temperature of 120 ° C. and a draw ratio of 3.3 times, and used in the same manner as in Example 1 except that it was used as the drawn yarn (a). I got a thread. The obtained mixed yarn had a strength of 3.3 cN / dt, the maximum temperature drop was the same as that of Comparative Example 1, and even in sensory evaluation, the feeling of cooling was hardly felt at 0.1 points.

Comparative Example 3
Using the high-density polyethylene used in Example 1, a drawn yarn (I) was obtained in the same manner as in Example 1 to obtain a core yarn, and using the high-density polyethylene used in Example 1, a comparative example A blended yarn obtained by obtaining 1 drawn yarn (a) as a sheath yarn was prepared in the same manner as in Example 1. The obtained mixed yarn had a strength of 2.2 cN / dt. When a tubular knitting was made in the same manner as in Example 1, the sensory evaluation of cooling sensation was 3.0 points, and the maximum temperature drop was -1.9 ° C compared to Comparative Example 1, but the sensation of cold was felt. When it exceeded 120 ° C., it shrunk excessively and the dimensional stability was not good.

Comparative Example 4
Using the drawn yarn (a) used in Comparative Example 1 as the sheath yarn and using the high-density polyethylene used in Example 1, the drawn yarn (I) is obtained in the same manner as in Example 1 and used as the core yarn. Then, a mixed yarn was prepared by the same method as in Example 1. The obtained mixed yarn had a strength of 2.6 cN / dt. When the cylindrical knitting was made and evaluated in the same manner as in Example 1, the sensory evaluation of cooling sensation was 0.5 point, and the maximum temperature drop was -0.3 ° C. with respect to Comparative Example 1 and the cooling sensation was not obtained. became.

Example 2
A high-temperature polyethylene (melt flow rate according to JIS K-7210; 19) is melted with an extruder set at 230 ° C., and a temperature of 240 ° C. from a die having 12 discharge holes having a cross-sectional shape shown in FIG. The ink was discharged under conditions and wound up at a spinning speed of 1500 m / min. The wound undrawn yarn was drawn under the conditions of a preheating temperature of 90 ° C., a heat setting temperature of 120 ° C. and a draw ratio of 4.0 times, and 84 dtex / 12 fils. Polyethylene flat cross section fiber was obtained as a drawn yarn (a).
Using this drawn yarn (a) as a sheath yarn and the drawn yarn (a) of Example 1 as a core yarn, a blended yarn was obtained in the same manner as in Example 1. The strength of the obtained blended yarn was 2.7 cN / dt, the cold feeling evaluation of the tubular knitting produced by the same method as in Example 1 was 3.0 points in sensory evaluation, and the maximum temperature drop was in Comparative Example 1. On the other hand, a sufficiently cool feeling of 2.1 ° C. was felt.

Example 3
In Example 1, except that the base having the cross-sectional shape shown in FIG. Polyethylene flat cross section fiber was obtained as a drawn yarn (a).
Using this drawn yarn (a) as a sheath yarn and the drawn yarn (a) of Example 1 as a core yarn, a blended yarn was obtained in the same manner as in Example 1. The strength of the obtained blended yarn was 2.8 cN / dt, the cold feeling evaluation of the tubular knitting produced by the same method as in Example 1 was 3.0 points in sensory evaluation, and the maximum temperature drop was in Comparative Example 1. On the other hand, a cool feeling of 1.9 ° C. was felt.

  According to the present invention, it is possible to obtain a mixed yarn having excellent contact cooling feeling and texture when made into a fabric and having excellent workability. A useful fiber product can be provided.

A: Width of long axis of flat cross section B1: Maximum width of short axis perpendicular to long axis of flat cross section B2: Minimum width of short axis corresponding to constricted portion

Claims (1)

A blended yarn having a core-sheath structure, comprising at least one fiber selected from sheath yarn, polyester, polyamide, and polyolefin, wherein high-density polyethylene is the main constituent and the following requirements (1) to (4) are simultaneously satisfied. A mixed yarn excellent in cooling sensation, characterized in that a core yarn is a fiber mainly composed of at least a fiber-forming polymer.
(1) The shape of the cross-section perpendicular to the fiber axis of the fiber is a flat shape, and the cross-section single yarns are linearly connected in the longitudinal direction of the cross-section, and have 2 to 5 constricted portions.
(2) The ratio A / B1 between the long axis width A of the flat cross section and the short axis maximum width B1 perpendicular thereto is 2-6.
(3) The ratio B1 / B2 between the short axis maximum width B1 of the flat cross section and the short axis minimum width B2 corresponding to the constriction is 1.05 or more and 1.6 or less.
(4) The single yarn fineness is 0.1 to 10 dtex and the strength is 1.5 cN / dt or more.

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