JP2005154949A - Functional knitted fabric and knitted fabric product using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a functional knitted fabric excellent in properties such as touch feeling and a drying property and a knitted fabric product using the functional knitted fabric. <P>SOLUTION: A part or all of the functional knitted fabric is formed of a yarn P consisting mainly of a weakly acidic fiber having a low hygroscopic property. In the stitch composed of the yarn P, the height (H) of each loop and the length (L) of the yarn P ranging from the top of adjacent loop to the top thereof are set so as to satisfy formula (1) and formula (2). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a functional knitted fabric having an excellent water absorption / diverging action and a knitted fabric product using the functional knitted fabric.

  Conventionally, as fiber materials used for underwear, natural fibers such as cotton and wool, which are excellent in touch and water absorbency, have been widely used, but these fibers stick to the skin when sweating and are dry. There is a problem that it is not good.

Therefore, a hygroscopic fiber yarn is used on the front side of the fabric, a non-hygroscopic multifilament yarn is used on the back side of the fabric, and there is a knitted product (see Patent Document 1) that has a certain texture and drying property. A special double-structure quick-drying knitted fabric using hydrophobic fibers for the lining (see Patent Document 2) has been proposed. In addition, in consideration of the environment, as a biodegradable skin-wearing knitted fabric that is gentle on the skin, a fabric using 50% or more of polylactic acid fibers (see Patent Document 3) has been proposed.
JP 2001-288650 A JP 2003-13344 A JP 2001-234454 A

  However, these knitted products and knitted fabrics are both pros and cons and do not satisfy all the characteristics such as texture and dryness. Therefore, further improvements are required.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a functional knitted fabric excellent in various characteristics such as texture and dryness and a knitted fabric product using the same.

In order to achieve the above object, the present invention provides a knitted fabric part or all of which is formed of a yarn P mainly composed of low moisture absorption and weakly acidic fibers. A functional knitted fabric in which the height (H) of the yarn and the length (L) of the yarn P from the apex of the adjacent loop to the apex are set to satisfy the following expressions (1) and (2) This is the first gist.

  In addition, the present invention has, in particular, a functional knitted fabric in which the yarn P is mainly composed of polylactic acid-based fibers, and, together with the yarn P, cotton, hemp, silk A third aspect is a functional knitted fabric in which a yarn A mainly composed of at least one fiber selected from the group consisting of wool, rayon and nylon is combined.

  Furthermore, the present invention is a knitted fabric product using the functional knitted fabric according to any one of the first to third aspects, and is set so that a lot of stitches made of the yarn P appear on at least one side. The fourth aspect is a knitted fabric product that is to be worn or used with the surface on which a large amount of the yarn P appears on the skin, and in particular, the knitted fabric product includes an inner, underwear, T A knitted fabric product that is one of a shirt, sportswear, homewear, and socks is a fifth gist.

  That is, the functional knitted fabric of the present invention is partly or entirely formed of a yarn P mainly composed of low moisture absorption weakly acidic fibers, and each loop height (H) of the stitch formed of the yarn P Since the predetermined length (L) of the yarn P constituting the loop is set to have a specific relationship, the stitch formed by the yarn P forms a specific recess gap. . Therefore, when used for applications in which the stitch portion formed with the yarn P hits the skin, in the summer, sweat moves from the concave space to the outside (front side), so the skin is not sticky and is comfortable to wear. A feeling is obtained. Moreover, in winter, since air accumulates in the above-mentioned recess gap and exhibits a heat insulating effect, the heat retaining effect is high. And since the main component of the thread | yarn P is weakly acidic, there exists an advantage that it can be used favorably with respect to sensitive skin. In particular, when a yarn mainly composed of a polylactic acid-based fiber that is a biodegradable fiber is used as the yarn P, the burden of disposal processing is reduced, which is more effective.

  Further, the knitted fabric product of the present invention uses the functional knitted fabric described above, and is set so that a large number of stitches made of the yarn P appear on at least one surface, which is worn or used by placing the surface on the skin. Therefore, it is possible to obtain an excellent wearing feeling.

  Next, an embodiment of the present invention will be described.

  First, the functional knitted fabric of the present invention is a knitted fabric formed partially or entirely using a yarn P mainly composed of a low moisture absorption weakly acidic fiber.

  The above-mentioned “low hygroscopic weakly acidic fiber” is a fiber having low hygroscopicity in comparison with natural fibers such as cotton and hemp, which are generally known as high hygroscopic fibers, and has a pH of 5.5 to 5.5. 6.9 refers to a weakly acidic fiber having a pH of 6.0 to 6.5. However, the above “hygroscopicity” and “pH” are measured by the following methods.

[Measurement method of moisture absorption rate]
After measuring the weight (W) of a sample piece that was left in an atmosphere of 25 ° C. and 35% RH for 2 hours, the sample was left to stand in an atmosphere of 35 ° C. and 85% RH for 20 minutes to absorb moisture. ′) Is measured. Then, the difference between W ′ and W is divided by W, and a value (%) obtained by multiplying the value by 100 is defined as the moisture absorption rate of the sample piece.

[Measurement method of pH]
After measuring the weight of the sample piece cut to a size of 1.6 cm × 1 cm with an electronic balance, the sample piece is placed on the electrode of a simple pH meter (TWIN pH, manufactured by Horiba, Ltd.). Then, distilled water 5 times the weight of the sample piece was dropped onto the sample piece on the electrode using a pipette (one drop of the pipette was about 0.05 g), and the stability mark was lit on the monitor of the simple pH meter. And read the pH value at that time.

  As the low moisture absorption weakly acidic fiber, a polylactic acid fiber excellent in biodegradability is suitable.

  The polylactic acid fiber is made of a resin composition containing polylactic acid as a main component, and uses polylactic acid containing L-lactic acid units of 80 mol% or more, preferably 95 mol% or more, more preferably 98 mol% or more. Is preferred. This is because the higher the ratio of the L-lactic acid unit, the better the fiber properties such as heat resistance. The polylactic acid is a compound having a polyfunctional group such as an aliphatic polyhydric alcohol, an alicyclic polyhydric alcohol, an aliphatic hydroxycarboxylic acid, an alicyclic hydroxycarboxylic acid, or a cyclic compound such as a lactone or a cyclic ether. A compound obtained by copolymerizing the compound preferably in an amount of 0.1 to 15% by weight, more preferably 0.1 to 10% by weight, and still more preferably 0.5 to 7% by weight can also be used.

  In addition, the yarn P used in the present invention may be blended with a limited proportion of other fibers having different physical properties in addition to the low moisture absorption weakly acidic fibers such as the polylactic acid fibers. The mixed form with other fibers may be a blended yarn or a blended yarn. However, the blend of the low moisture absorption weakly acidic fiber is preferably set to 50% by weight or more, more preferably 80% by weight or more based on the whole. And when it considers environment especially, it is more preferable to set to 95 weight% or more.

  Furthermore, in the functional knitted fabric of the present invention, together with the above-described yarn P, other types of different yarns A can be used in combination. The yarn A is not particularly limited, and in particular, a highly hygroscopic fiber, such as natural fibers such as cotton, hemp, silk, and wool, recycled fibers such as rayon, and yarns made of synthetic fibers such as nylon are used. Is preferred. The rayon also includes rayon made of cellulose obtained from bamboo. Of these, cotton is particularly optimal. The yarn A may also be a blended yarn or a blended yarn obtained by combining two or more types of fiber materials. Further, two or more different types of yarns A, A ′... May be knitted and knitted or knitted.

  In the functional knitted fabric of the present invention, the stitch formed of the yarn P may be set so as to appear on both the front and back surfaces, but if the stitch is configured to appear on at least a part of one side, it is constant. The effect is obtained. For example, even if one surface is composed of a stitch made of another yarn such as cotton, 50% or more, preferably 80% or more, more preferably 95% or more of the total area of the other surface is the yarn P. If it is comprised by the stitch which consists of, the feeling of favorable wear with respect to skin, such as non-stickiness, is obtained. Of course, a structure that is knitted so that only the stitches made of other yarns such as cotton appear on one side and only the stitches made of the yarn P appear on the other side has a very excellent effect.

  An example of such a knitted fabric is shown in FIG. This knitted fabric is a two-layer milled knitted fabric knitted by a milling knitting machine, and is displayed on the back surface (front side in the figure) with a yarn P mainly composed of low moisture-absorbing weakly acidic fibers (in the figure, white). Only the stitches made of other yarns A (shown in black in the drawing) appear on the surface (the back side in the drawing).

  Other suitable knitted fabrics for the functional knitted fabric of the present invention include circular knitted fabrics using circular knitting machines (including double knitted fabrics such as Kanoko knitting and honeycomb knitting), flat knitted fabrics using flat knitting machines, Examples include tricot knitted fabrics and Russell knitted fabrics using a warp knitting machine.

  The functional knitted fabric of the present invention has a loop height (indicated by H in FIG. 1) of the stitches composed of the yarn P and a length (L) of the yarn P from the apex of the adjacent loop to the apex. (The length of the portion of the yarn P sandwiched between two straight lines X in FIG. 1) must be set so as to satisfy the following expressions (1) and (2).

  That is, if H is smaller than 0.05 mm, the loop portion is too small to form a concave gap for holding water, so that a dull feel cannot be obtained. Conversely, if H is larger than 3 mm, sweat or moisture is not obtained. Accumulates in the loop and does not dry, creating stuffiness and causing problems. Further, when L / H is less than 2.1, the stitches of the yarns P are too close to each other, and the concave gap formed in the portion facing the skin is too small, and a smooth feel is obtained. There is no problem.

  Therefore, the functional knitted fabric of the present invention set so as to satisfy the above two formulas (1) and (2) is suitable for transferring sweat and water vapor to the front side and diverging by each loop of the stitch. A concave cavity having a size is formed.

  The functional knitted fabric of the present invention configured as described above is partly or entirely formed of a yarn P mainly composed of low moisture absorption and weak acid fibers, and each loop height of the stitch formed of the yarn P is high. Since the length (H) and the predetermined length (L) of the yarn P constituting the loop are set to have a specific relationship, the stitch formed by the yarn P forms a specific recess gap. It is like that. Therefore, when used in applications such as underwear that uses the surface on which the stitches formed with the yarn P appear on the skin, the sweat does not become sticky in the summer, since sweat moves from the concave space to the outside (front side). A smooth and comfortable wearing feeling can be obtained. Moreover, in winter, since air accumulates in the above-mentioned recess gap and exhibits a heat insulating effect, the heat retaining effect is high. Furthermore, since the main component of the thread P is weakly acidic, there is an advantage that it can be used well for sensitive skin. In particular, when a yarn mainly composed of a polylactic acid-based fiber that is a biodegradable fiber is used as the yarn P, the burden of disposal processing is reduced, which is more effective.

  Therefore, the knitted fabric product using the functional knitted fabric of the present invention can be worn or worn with the surface made of the yarn B applied to the skin, thereby obtaining an excellent wearing feeling and wearing feeling. Examples of such knitted fabric products include innerwear, underwear, and T-shirts that are directly worn on the skin. It can also be used as sportswear, homewear, socks and the like.

  Next, examples of the present invention will be described together with comparative examples.

[Example 1]
A cotton yarn (30th) was prepared as the yarn A made of high hygroscopic fiber, and a multifilament yarn (56 dtex / 48f) made of polylactic acid fiber was prepared as the yarn P made of low hygroscopic weakly acidic fiber. Then, using a circular knitting machine, knitting to become a honeycomb knitting of the structure shown in FIG. 2, the front side is formed with a stitch made of cotton yarn, the back side is formed with a stitch made of multifilament yarn of polylactic acid fiber, A double knitted fabric was obtained. In this, the unevenness derived from the honeycomb knitting is formed on the entire knitted fabric. The height H of each loop of the stitches made of the yarn B was 1.2 mm, and the length L of the yarn P from the apex of the adjacent loop to the apex was 3.4 mm. Therefore, the value of L / H is about 2.83.

[Example 2]
A knitted fabric similar to that of Example 1 was obtained using only the multifilament yarn of polylactic acid fiber used in Example 1.

[Comparative Example 1]
A knitted fabric similar to that in Example 1 was obtained using only the cotton yarn used in Example 1.

  About the said Example 1, 2 products and the comparative example 1 product, while measuring the pH and water absorption diffusibility of the back surface side, the moisture absorption rate and drying property were measured and evaluated. The methods for measuring the above “pH” and “moisture absorption rate” are as described above, and the evaluation of “moisture absorption rate” is as follows. What exceeded% was set as x. Moreover, the measurement / evaluation methods of the above “water absorption diffusibility” and “dryability” are as follows.

[Water absorption diffusivity]
Place 1 ml of water on a glass plate, place the knitted fabric so that the back is in contact with water, photograph the surface of the fabric after 1 minute with a digital camera, and measure the area of water diffused on the surface side. It was measured.

[Drying]
Take 3g of knitted fabric, drop about 30% of its own weight of water near its center and measure its weight, then leave it in the standard state (20 ° C, 65RH%). Was measured to calculate the drying rate. Then, when 75 minutes passed, the sample was completely dried, or the sample with a drying rate of 90% or more was marked with ◯, and the sample with less than 90% was marked with ×.

  Furthermore, female underwear was produced using the knitted fabrics of Examples 1 and 2 and Comparative Example 1 and was actually worn by 10 monitors, and the comfort was evaluated. The comfort was evaluated as a three-step evaluation: ◎… good, ○… normal ×… bad. These results are summarized in Table 1 below.

  From the above results, it can be seen that the products of Examples 1 and 2 are superior to the whole.

[Examples 3-6, Comparative Examples 2-5]
The stitches of yarn A and yarn P were changed as shown in Table 2 below. Otherwise, in the same manner as in Example 1 above, eight types of knitted fabrics were obtained. These were also evaluated in the same manner as described above for three items of hygroscopicity, drying property, and comfort. These results are also shown in Tables 2 and 3 below.

  From the above results, it can be seen that good results were obtained for all of the examples. On the other hand, it can be seen that the comparative product has a bad result in any item and is not practical.

It is explanatory drawing of the functional knitted fabric which is one Example of this invention. It is explanatory drawing which shows the knitting structure of one Example of this invention.

Explanation of symbols

  P Yarn mainly composed of low moisture absorption and weak acid fiber

Claims (5)

Part or all of the knitted fabric is formed of a yarn P mainly composed of low moisture absorption weakly acidic fibers, and in the stitch formed of the yarn P, the height (H) of each loop and the adjacent loop A functional knitted fabric characterized in that the length (L) of the yarn P from the apex to the apex is set to satisfy the following formulas (1) and (2).
  The functional knitted fabric according to claim 1, wherein the yarn P is mainly composed of polylactic acid fiber.   The functional knitted fabric according to claim 1 or 2, wherein a yarn A containing at least one fiber selected from the group consisting of cotton, hemp, silk, wool, rayon and nylon is combined with the yarn P. .   A knitted fabric product using the functional knitted fabric according to any one of claims 1 to 3, wherein the knitted fabric made of the yarn P is set so as to appear at least on one side, and the yarn P is A knitted fabric product that is designed to be worn or used with the face that appears most often on the skin.   The knitted fabric product according to claim 4, wherein the knitted fabric product is any one of innerwear, underwear, T-shirts, sportswear, homewear, and socks.