JPWO2013168543A1 - Atypical cross-section fiber with excellent cooling feeling - Google Patents

Abstract

A fiber having polyethylene as a main constituent, the cross-section perpendicular to the fiber axis of the fiber is a flat shape, and the ratio A between the long axis width A of the flat cross section and the shortest axis maximum width B1 perpendicular thereto By setting / B1 to be 2 to 10, an atypical cross-section fiber that exhibits excellent contact cooling feeling and texture when made into a fabric and is excellent in workability is provided.

Description

  The present invention relates to a modified cross-section fiber excellent in cooling feeling. More specifically, the present invention relates to an atypical cross-section fiber excellent in cooling feeling that can be suitably used for apparel use, 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, those using a hygroscopic polymer as a polymer constituting the fiber (Patent Document 1), those 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 chance that the core holding moisture transferred through the gaps in the fibers of the flat cross section reduces contact with the skin. This method is not different from the method using the hygroscopic polymer in that processing is employed.

  Furthermore, fabrics that use highly oriented polyethylene fibers or highly oriented polybenzoxazole fibers to increase the thermal conductivity of the fabric have also been proposed, but the fabric imparts a cool feeling to the thermal conductivity of the constituent fibers themselves. Because it depends, it is possible to obtain a certain degree of coolness, but it has not yet been reduced to the feeling of stickiness when sweating. Therefore, the conventional method has not obtained an atypical cross-section fiber that sufficiently achieves a feeling of cooling, workability, and durability, and an improvement thereof is desired.

JP 2003-293223 A JP 2004-270075 A JP 2007-224429 A JP 2006-161226 A JP 2004-11069 A JP 2010-236130 A

  An object of the present invention is made in the background of the above-described conventional technology, and an object of the present invention is to provide an atypical cross-section fiber that exhibits excellent contact cooling feeling and texture when used as a fabric and is excellent in workability. .

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the above object can be achieved by specifying a polymer for forming a fiber in an irregular cross-section fiber, and reached the present invention.

  That is, according to the present invention, a fiber having polyethylene as a main component, the cross-section perpendicular to the fiber axis of the fiber is a flat shape, and the width A of the long axis of the flat cross-section and a short width perpendicular thereto. An atypical cross-section fiber excellent in cooling sensation characterized in that the ratio A / B1 of the maximum shaft width B1 is 2 to 10.

  ADVANTAGE OF THE INVENTION According to this invention, the unusual cross-section fiber excellent in workability which can express the cool feeling of contact and the texture when it was set as the fabric can be provided.

It is a schematic diagram which shows an example of the cross section orthogonal to the fiber axis of the atypical cross-section fiber of this invention. It is a schematic diagram which shows the other example of the cross section orthogonal to the fiber axis of the atypical cross-section fiber of this invention.

Drawing reference

    In FIG. 1, A represents the width of the major axis in the fiber cross section, and B1 represents the maximum width of the minor axis perpendicular thereto.

    In FIG. 2, A represents the width of the long axis in the fiber cross section, B1 represents the maximum width of the short axis perpendicular to the cross section, and B2 represents the minimum width of the short axis corresponding to the constricted portion.

  Hereinafter, embodiments of the present invention will be described in detail.

  The atypical cross-section fiber of the present invention needs to have polyethylene as a main constituent. 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 polymer used for the fiber of the present invention may contain conventionally known antioxidants, light-proofing agents, flame retardants, pigments and the like as long as the object of the present invention is not impaired.

  The atypical cross-section fiber of the present invention has a flat cross-sectional shape so that the contact area with the skin can be effectively increased and a cool feeling of contact can be sufficiently felt when the cloth for clothing is used. It is necessary.

  The ratio A / B1 between the width A of the long axis of the flat shape and the maximum width B1 of the short axis perpendicular thereto needs to be 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 modified cross-section fiber of the present invention is a shape in which round cross-section single yarns are linearly connected in the major axis 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 fiber is not a mere flat shape, but has a constricted portion, for example, without excessively relying on the reflection of inorganic compound particles, thereby improving the irregular reflection on the fiber surface and the light refraction effect, thereby preventing permeation. It is possible to impart a certain degree of property. 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 in the case of a fabric such as a woven or knitted fabric, the long axis is difficult to be arranged parallel to the fabric surface, and the heat shielding property may be 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 may be reduced, and when B1 / B2 exceeds 1.6, the thickness of the connecting portion (constriction portion) becomes thin, The cooling effect may be reduced. A preferred range is 1.1 to 1.4.

  The single yarn fineness of the modified cross-section fiber 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.

  Further, the strength of the modified cross-section fiber of the present invention is preferably 1.5 cN / dt or more. If the strength is less than 1.5 cN / dt, the durability is poor.

  As a method for spinning the modified cross-section fiber 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. In addition, a known antistatic agent, fiber finishing agent, or the like can be used as necessary in the process of spinning and stretching the fiber.

  When the atypical cross-section fiber of the present invention is used as a fabric, it may be used for all the 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, place it on a stainless steel plate with a thickness of 10 cm x 10 cm and heated to 40 ° C in advance, measure the temperature at the center of the stainless steel plate with a thermocouple, measure the maximum temperature drop, The temperature difference was evaluated.

(4) Stability of yarn making In the spinning and drawing processes, the number of times of yarn breakage per day, the number of windings of a single yarn is 0-1 times, ◎ 2-4 times are ◯, 5-8 times are △, 9 times or more are did.

Reference Examples 1-2
In Examples 1 and 2, similar fibers were obtained using polyethylene terephthalate (inherent viscosity 0.63). Tube knitting was made in the same manner as in Examples 1 and 2 and used as a criterion for evaluation of cooling feeling.

  In addition, the temperature difference of cooling sensation evaluation is the temperature difference from the maximum drop temperature of Reference Example 1 for Examples 1 and 3 and Comparative Example 1, and the maximum drop of Reference Example 2 for Examples 2 and 4 to 5. Indicates the temperature difference from the temperature.

Example 1
High-density polyethylene (melt flow rate according to JIS K-7210; 19) is melted with an extruder set at 230 ° C., and discharged at a temperature of 240 ° C. from a die having 12 discharge holes having the cross-sectional shape shown in FIG. And wound 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 to obtain a polyethylene flat cross-section fiber of 84 dtex / 12 filaments.

  Two pieces of the obtained fibers were combined to create a tubular knitting, and the cool feeling was evaluated. Table 1 shows the physical properties and evaluation results of the obtained fibers.

Example 2
84 dtex / 36 filaments of a polyethylene flat cross-section fiber was obtained in the same manner as in Example 1 except that a nozzle having 36 discharge holes and having a cross-sectional shape shown in FIG. 2 was used. Table 1 shows the physical properties of the obtained fibers and the evaluation results of the tubular knitting made using the fibers.

Comparative Examples 1-2
In Example 1, it implemented like Example 1 except having changed the cross-sectional shape of the fiber. Table 1 shows the physical properties and evaluation results of the obtained fibers.

Examples 3-4
In Example 2, it implemented like Example 2 except having changed the cross-sectional shape of the fiber. Table 1 shows the physical properties and evaluation results of the obtained fibers.

  As shown in Table 1, Examples 1 and 2, which are within the scope of the present invention, are excellent in yarn-making property and physical properties and excellent in cooling feeling when used as a fabric. When a plain woven fabric was woven without twisting at a weaving density of 110 / 2.54 cm to create a shirt and evaluated for wearing, it was excellent in a refreshing feeling.

  The comparative example 1 whose cross-sectional shape is a round cross-section became inferior in cooling feeling. Further, in Comparative Example 2 where the flatness ratio was larger than the range of the present invention, although a cooling sensation was obtained, the spinning performance was poor and the process stability was poor.

  On the other hand, in the cross-sectional shape, Example 3 with a high number of constrictions and high flatness results in slightly inferior process stability and physical properties at the time of spinning, and in Example 4 in which the thickness of the constricted portion is reduced, the cooling sensation is slightly reduced. It became.

  The atypical cross-section fiber of the present invention has an excellent cooling feeling and a good texture, has a refreshing feeling when used as a fabric, and can be used for many applications such as sports and outer clothing and industrial materials. The industrial value is extremely large.

Claims (3)

  A fiber having polyethylene as a main constituent, the cross-section perpendicular to the fiber axis of the fiber is a flat shape, and the ratio A between the long axis width A of the flat cross section and the shortest axis maximum width B1 perpendicular thereto / B1 is 2 to 10, an atypical cross-section fiber excellent in cooling feeling. The atypical cross-section fiber excellent in cooling feeling according to claim 1, wherein the fiber satisfies the following requirements (1) to (3) simultaneously.
(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.   The modified cross-section fiber excellent in cooling feeling according to claim 1 or 2, wherein the single yarn fineness is 0.1 to 10 dtex and the strength is 1.5 cN / dt or more.

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