JP2001020159A - Refreshing knit fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refreshing knit fabric having functions such as moisture absorbing properties suitable to the Japanese summer with high temperatures and humidity, sweat treating functions, refreshing properties and the likes and capable of maintaining the functions even through repeatedly worn and washed. SOLUTION: This refreshing knit fabric consists of cellulose multifilaments and synthetic fiber multifilaments having a modification degree of 1.2-2.2. In the refreshing knit fabric, the ratio of the denier (D1) of the aforesaid cellulose multifilaments over the denier (D2) of the synthetic fiber multifilaments is brought to be 2-7, the denier of a single filament constituting the cellulose multifilaments is brought to be 7-30 Dtex and the surface share of the cellulose multifilaments on the surface of the aforesaid knit fabric is brought to be 70-100%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a cool knitted fabric,
More specifically, it contains cellulose multifilaments and synthetic fiber multifilaments, and has a high cellulose surface occupancy, excellent moisture absorption and sweat treatment function, has a unique crispness and feel, and is especially suitable for men's underwear. Regarding excellent cool knitted fabric.

[0002]

2. Description of the Related Art Knitted fabrics pursuing coolness have been proposed in various ways reflecting the characteristic of high temperature and humidity in summer in Japan, and various exercise clothes and women's underwear using the knitted fabrics have also been proposed. . However, there have not been many proposals regarding men's underwear knitted fabrics that are excellent in coolness. As a material for knitted fabrics worn under men's clothing, cotton has been mainly used. Cotton is light, excellent in swelling and flexibility, has heat retention, and has a moisture absorbing property and a sweat absorbing property. However, when worn in the summer of Japan, which is hot and humid, there is often a case where a large amount of sweat is absorbed.In that case, cotton underwear absorbs a large amount of sweat due to its excellent sweat absorption, but it is sticky to the skin, There was a defect that the sticking and sweat treatment functions were not sufficient. Furthermore, cotton, which is a natural fiber, is a short fiber, and its length and diameter vary, so the yarn itself has excessive swelling, and when knitted,
The air permeability and the heat transfer property were easily hindered, and sufficient refreshability was not obtained.

In order to improve such disadvantages, underwear using strong twisted cotton yarn has been proposed. If you twist the cotton,
Excessive swelling of the yarn itself is reduced, breathability, heat transferability, etc. are increased, cooling is improved, and convergence is increased,
The rigidity as a yarn is increased, and the disadvantage of sticking to the skin is reduced. However, when wearing and washing are repeated, the convergence of the twisted yarn is reduced, the cooling property is reduced, and the effect of preventing sticking is also reduced. In addition, there is a disadvantage that the texture and the touch are changed to a hard and stiff one. Further, since cotton alone does not provide sufficient cooling properties, it has been proposed to use it in combination with other natural fibers such as hemp, and synthetic fibers such as polyester. It is difficult to improve the reduction of stickiness due to diffusion, and there is a limit to the suppression of performance deterioration due to repeated wearing and washing.

On the other hand, JP-A-3-27148 discloses that
A woven or knitted fabric excellent in cool feeling has been proposed in which the single fiber fineness of the rayon filament is 7 to 20 denier (7.8 to 22 Dtex) and the ratio of the rayon filament to the yarn constituting the back surface is 50% by weight or more. . In the above woven or knitted fabric, rayon filaments are used on the back side (skin side), so that vapor-phase sweating can be treated and the stuffiness is reduced, but after heavy sweating, rayon retains excess sweat You may feel cold. In particular, when a person walks outside in the middle of summer and sweats a lot, and then enters a cooling environment, he or she feels a remarkable feeling of cooling. Therefore, a further improvement in the sweat treatment function is required.

Japanese Patent Application Laid-Open No. Hei 10-131000 discloses that the knitted portion on the back surface has an uneven portion having a height difference of 0.2 to 2 mm, and the concave portion in the uneven portion has a single fiber fineness of 1 denier (1 denier). .1Dtex) to 5 denier (5.6Dtex), composed of rayon multifilament yarn or mixed yarn of polyester multifilament and rayon multifilament, and the convex portion of the uneven portion and the knitted portion of the surface are composed of polyester multifilament yarn. A knitted fabric and athletic clothing using the knitted fabric have been proposed.

According to the knitted fabric, the surface directly in contact with the skin has irregularities, and the convex portion is made of a polyester multifilament yarn or a mixed yarn of polyester multifilament and rayon multifilament. Although improved, the knitted fabric with unevenness inevitably increased the thickness and the basis weight, and was not suitable as a knitted fabric worn under daily life for a long time. in this way,
A cool knitted fabric that has a refreshing property and a sweat-treating function suitable for a hot and humid Japanese summer and can maintain various functions even after repeated washing, particularly a cool knitted fabric suitable for men's underwear has not been obtained.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide functionalities such as hygroscopicity, sweat treatment function, and coolness which are suitable for the high temperature and high humidity summer in Japan. An object of the present invention is to provide a cool knitted fabric that can maintain its functionality and is particularly suitable as men's underwear.

[0008]

The invention claimed in the present application is as follows. (1) Cellulose multifilament and irregularity 1.2 ~
2. A knitted fabric comprising the synthetic fiber multifilament of 2.2, wherein the cellulose multifilament fineness (D
₁ ) and the ratio (D ₁ / D ₂ ) of the synthetic fiber multifilament fineness (D ₂ ) is 2 to 7, and the single yarn fineness of the filaments constituting the cellulose multifilament is 7 to 30
A cool knitted fabric, which is Dtex, and has a surface occupancy of 70 to 100% of the cellulose multifilament on the surface of the knitted fabric.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The cool knitted fabric of the present invention comprises cellulose multifilaments and synthetic fiber multifilaments. As the cellulose multifilament used in the present invention, viscose rayon,
Copper ammonia method rayon (cupra), polynosic rayon, and the like. Of these, viscose rayon, which is less likely to be fibrillated by washing, has good washing durability, and can relatively easily increase the single-fiber fineness, is preferred.

The filament size of the filaments constituting the cellulose multifilament is 7 to 30 Dtex, preferably 10 to 25 Dtex. This single yarn fineness is 7Dte
If it is less than x, the single-strength bristles are insufficient, and the crispness is reduced, so that sufficient refreshing properties cannot be obtained, and the coefficient of friction when wet increases. Sticking occurs. On the other hand, if the single-fiber fineness exceeds 30 Dtex, the bristles become too large, the skin feels hard, and an unpleasant texture is obtained. The number of filaments constituting the cellulose multifilament is not particularly limited, and the single yarn fineness used,
It is appropriately determined according to the set fineness ratio between the cellulose multifilament and the synthetic fiber multifilament.
~ 30.

The cellulose multifilament can contain ceramic fine powder. Known compounds such as oxides such as titanium oxide, silicon oxide and zirconium oxide, carbides such as silicon carbide, and metal compounds such as potassium titanate and sodium titanate can be used as the ceramic fine powder. The 50% average particle size of the ceramic fine powder to be contained is preferably 0.01 to 10 μm. If the average particle size is less than 0.01 μm, the cohesive force of the powder becomes too large and uniform dispersion in the filament may become difficult. If it exceeds 10 μm, the ceramic fine powder is exposed on the filament surface, and The apparatus may be worn in a process such as standing. The preferred content of the ceramic fine powder is in the range of 0.1 to 5% by weight, and the more preferred content is 0.5 to 4% by weight. When the content of the ceramic fine powder is less than 0.1% by weight, the matting effect of the filament is not sufficient, and the see-through prevention effect when knitted fabric may be insufficient, and 5% by weight.
If the number exceeds the limit, the apparatus may be worn in steps such as knitting.

The method for incorporating the ceramic fine powder into the cellulose multifilament is not particularly limited, and includes, for example, a method in which the ceramic fine powder is dispersed in a spinning solution and then spun by a known method. Various known additives other than the ceramic fine powder may be contained according to the purpose. The method for producing the cellulose multifilament is not limited, and the Hank method, the cake method, the spool method,
It can be manufactured by a known spinning method such as a net process method and a continuous method. Of these, the Hank method and the cake method, in which the control of single yarn fineness can be relatively easily performed, are preferred.

The synthetic fiber multifilaments used in the present invention include polyester multifilaments such as polyethylene terephthalate and polybutylene terephthalate, polyamide multifilaments such as nylon 6 and nylon 66, polyacryl multifilaments such as polyacrylonitrile, polyethylene and polypropylene. And known synthetic fibers such as polyolefin multifilaments. Of these, polyester, polyacryl, and polyolefin, which have no hygroscopicity in the polymer itself, are preferable in consideration of the sweat-treating function, especially quick-drying property, and are more easily deformed, and have processability including washing durability and dyeing. Considering the cost, polyester, especially polyethylene terephthalate multifilament is more preferred.

In the present invention, as the synthetic fiber multifilament, a filament having an irregular cross section having an irregularity of 1.2 to 2.2, preferably 1.3 to 2 is used. When the degree of irregularity of the filament is less than 1.2, the sweat-treating function decreases, and when the degree of irregularity exceeds 2.2, production stability such as spinnability decreases. Here, the irregularity of the filament can be calculated by the following method. First, the filament is cut using a safety razor, the obtained cross-sectional shape is imaged with an optical microscope or a scanning electron microscope, and the image is analyzed with image analysis software (for example, "IP-1000P" manufactured by Asahi Kasei Corporation).
C ”), and measures the cross-sectional area S and the circumferential length L.
Using the values of L and L, the degree of irregularity is calculated by equation (1) L / (4 · π · S) ^0.5 (1).

The larger the degree of irregularity of the filament, the larger the specific surface area of the filament at the same single-filament fineness, and the more efficient the sweat treatment such as perspiration and perspiration transfer. Examples of the irregular cross-sectional shape include a polygonal shape such as a triangular shape, a square shape, a rectangular shape such as a rectangular shape, an L type, a T type, a Y type, a W type, an eight leaf type, a flat type, a dog bone type, a UFO type, etc., and a multi leaf type. The shape is not particularly limited as long as the degree of irregularity is satisfied, but it is excellent in sweat treatment function, and in terms of realizing a soft texture required for underwear, a rectangle, W
Mold and flat type are preferable, and W type and flat type are more preferable.
In a rectangular, W-shaped or flat cross-sectional shape, the ratio of width to thickness (aspect ratio) obtained by image analysis is preferably 2 or more from the viewpoint of obtaining a soft texture.

The fineness of single filament of the synthetic fiber multifilament is preferably 0.1 to 10 Dtex from the viewpoint of obtaining a knitted fabric having a soft texture.
0.5 to 5 Dtex is more preferred. The number of filaments of the synthetic fiber multifilament is preferably 5 to 100, more preferably 8 to 90. Further, the synthetic fiber multifilament may contain a matting agent such as titanium oxide and various known additives according to the purpose.

The cool knitted fabric of the present invention has a ratio (D ₁ / D ₂ ) of the cellulose multifilament fineness D ₁ to the synthetic fiber multifilament fineness D ₁ of ₂ to 7, preferably 3 to 6. When the fineness ratio is less than 2, the mixing ratio of the cellulose multifilament in the knitted fabric decreases, or the number of the cellulose multifilaments decreases, and in any case, the hygroscopicity and the sweat-treating function decrease. On the other hand, if the fineness ratio exceeds 7, the mixing ratio of the synthetic fiber multifilaments decreases, and the properties after washing deteriorate. Further, by using the multifilament, the opening area in the thickness direction of the knitted fabric can be substantially increased even under the same structure and the same knitting condition as compared with the case where the short fiber is used, so that the ventilation resistance can be reduced. . Here, the multifilament means a plurality of substantially continuous fibers (filaments) assembled into a yarn.

[0018] In the cool knitted fabric of the present invention, the surface occupancy of the cellulose multifilament on the surface (at least the surface on the skin side) is 70 to 100%, preferably 80 to 100%, more preferably 85 to 100%. is there. The surface occupancy is determined by measuring the image of the knitted fabric obtained by dyeing the cellulose multifilament in a single dye or a synthetic fiber multifilament in a different color at a resolution of 600 dpi in a range of 30 mm × 30 mm with a resolution of 600 dpi “IP-1”.
000PC ", binarized and analyzed for the area ratio. If the surface occupancy of the cellulose multifilament on the surface of the knitted fabric is less than 70%, the amount of heat radiation, unique crispness, and touch are reduced, and the cooling property is reduced.

The mixing ratio of the cellulose multifilament in the knitted fabric is preferably 60 to 90% by weight, more preferably 70 to 80% by weight. If the mixing ratio of the cellulose multifilament is less than 60% by weight, the hygroscopicity is insufficient,
The texture and feel of the cellulose may decrease, and the cooling property may decrease. On the other hand, if it exceeds 90% by weight, the properties may deteriorate after washing, the wet strength and the dimensional stability may be lacking.

The knitted fabric of the present invention has a cooling index (SB) in a sweaty environment represented by the following equation (2) and a cooling index (SB) in an environment where sweat flows according to the following equation (3): S
Both N) are preferably 1 or more, and more preferably 1.5 or more. SB = 1.08 (heat dissipation) + 1.98 x surface irregularity) + 6.25 (surface friction coefficient)-13.92 (2) SN = -0.03 (water transfer) + 1.42 (humidity transition) + 0.17 (heat dissipation) ) +0.76 (surface irregularity) + 12.1 (surface friction coefficient) -16.6 (3)

Here, the cooling index is a measure of the cooling property of clothing materials clarified by Asahi Kasei Kogyo Co., Ltd. through its own research, and is described in detail in Japanese Patent Application Laid-Open No. Hei 10-53941. A material having a higher cooling index has more refreshing comfort and has a better wearing feeling. A knitted fabric in which both SB and SN are 1 or more provides excellent refreshment and excellent comfort in both sweaty and sweaty environments. In the above formulas (2) and (3), the amount of heat radiation (W / m ² · ° C.) refers to the ability to release the heat inside the clothes to the outside, and the degree of surface unevenness refers to the unevenness of the fabric in contact with the skin surface. The degree of surface friction refers to the difficulty of sliding on the fabric in contact with the skin, and the amount of water (%) refers to the difficulty of returning the sweat absorbed by the fabric to the skin.
The degree of humidity transfer refers to the ability to release moisture in clothes to the outside, and these can be measured by the method described below.

The amount of heat radiation is preferably at least 10.8 W / m ² · ° C. from the viewpoint of sufficiently discharging the heat on the human body side to the outside. 8. from the point that the perspiration is sufficiently discharged to the outside.
It is preferably 0% or more, and the amount of water infusion is preferably 30% or less from the viewpoint of preventing liquid sweat once absorbed from re-migrating to the skin side of the human body and impairing the refreshing property. Further, the degree of surface unevenness is preferably 0.6 or more from the viewpoint of having a unique sharp feeling and touch, and the surface friction coefficient is preferably 0.25 or more.

In the knitted fabric of the present invention, since the surface occupation ratio and the mixing ratio of the cellulose multifilament are high, the amount of heat radiation and the degree of humidity transfer are large, and the heterogeneous synthetic fiber multifilament and the cellulose multifilament having a single yarn fineness are large. Due to the inclusion, the deformed synthetic fiber multifilaments quickly and efficiently transfer the sweat absorbed by the cellulose to the outside, reducing the amount of water that indicates the return of sweat to the skin, and further increasing the cellulose size of the single yarn. Since the surface occupancy of the multifilament is high, the degree of surface unevenness and the surface friction coefficient increase, so that the cooling index SB and SB can be easily set to 1 or more.

The wet friction coefficient of the cool knitted fabric in the present invention is preferably 0.8 or less, more preferably 0.5 or less. If the coefficient of friction when wet exceeds 0.8, a large amount of sweat is permeated and sticks to the skin when absorbed by the knitted fabric, making the wearing feeling uncomfortable. In the knitted fabric of the present invention, since the cellulose multifilament having a large single-filament fineness is used, the rigidity and softness when wet are large, and furthermore, since a modified synthetic fiber multifilament is used,
By having excellent transferability of the absorbed sweat to the outside, the wet friction coefficient can be reduced.

The basis weight of the cool knitted fabric in the present invention is 200
g / m ² or less, more preferably 170 g / m ^2
2 or less. If the basis weight is more than 200 g / m ² , it is easy to feel the weight when holding or wearing the knitted fabric by hand. In addition, the thickness of the knitted fabric is preferably 1 mm or less, more preferably 0.8 mm or less, from the viewpoint of wearing feeling. In the knitted fabric in the present invention, the airflow resistance measured under standard conditions using a KES-F8-AP1 airflow resistance measuring device (manufactured by Kato Tech) is preferably 30 Pa · s / m or less, more preferably 20 Pa · s / m. s / m or less. When the airflow resistance exceeds 30 Pa · s / m, the air permeability decreases,
Mobility of heat and water vapor may decrease. In the knitted fabric of the present invention, substantially continuous filaments are
Since 0% is used, the opening area in the thickness direction of the knitted fabric is substantially increased, and the airflow resistance is reduced. On the other hand, when natural fibers such as cotton are used, the airflow resistance is increased due to short fibers, variations in thickness and length, and easy generation of fluff.

The cool knitted fabric in the present invention is JIS-L
The change in the above properties after washing five times with the washing method specified in the Household Washing Machine Method 103 method is preferably 30% or less, more preferably 20% or less. Among the above-mentioned properties, especially the coefficient of friction when wet, the basis weight,
Changes in thickness and airflow resistance are large in a knitted fabric using natural fibers such as cotton. Therefore, it is preferable to suppress changes in the above-mentioned characteristics when wearing-washing or dry cleaning is repeated. When the change in these characteristics is large, the cooling property and the feeling of wearing are likely to deteriorate.

In the knitted fabric of the present invention, the change in the above characteristics is small even after repeated wearing and washing. This is because the knitted fabric contains a multifilament synthetic fiber which is stable in an organic solvent used for dry cleaning. It is presumed that the cellulose multifilament that swells greatly when wet is used, but its single-fiber fineness is large and its bristles are large, and it is difficult for the filaments to move mutually due to external force during wet-drying and washing. You. As a cellulose multifilament, if a viscose rayon that is difficult to fibrillate by washing or the like is used, the change in characteristics is further reduced,
preferable.

The knitting structure of the cool knitted fabric in the present invention is not particularly limited. For example, milling, smoothing, sheeting,
Examples include a round knitting structure such as bare sheeting and reversible, a warp knitting structure such as half tricot and Russell, and it is preferable to appropriately select according to the use of the knitted fabric. For example, for men's underwear, a circular knitting structure such as milling, smooth, sheeting, reversible is preferable, and for women's underwear, a milling, smooth, sheeting, bare sheeting, reversible circular knitting structure, tricot, half tricot. And the like. The gauge is preferably 14 to 40 GG for circular knitting and 14 to 40 GG for warp knitting.

The method of mixing the cellulose multifilament and the synthetic fiber multifilament is not particularly limited, as long as the cellulose multifilament is unevenly distributed on the knitted fabric surface so as to have the above-mentioned surface occupancy. For example, a method of knitting using a composite yarn obtained by a publicly-known composite yarn manufacturing method such as an on-machine knitting method in which both filaments are aligned or supplied to a knitting machine from another mouth, a twine, a twine, and a mixed fiber entanglement Are used. Considering the productivity and the degree of freedom of production, the method using on-machine knitting is preferred.

The knitting conditions for cross knitting on a machine are not particularly limited. However, in order to disperse the cellulose multifilaments at a certain occupancy on the surface of the knitted fabric, the knitting machine supply tension T ₁ of the cellulose multifilament and the synthetic fiber multifilament are adjusted. Filament knitting machine supply tension T ₂ ratio (T ₂ / T ₁ )
Is preferably 1 or more. By increasing the supply tension of the synthetic fiber multifilament, the synthetic fiber is likely to shrink in a process after knitting, and the synthetic fiber multifilament is unevenly distributed inside the knitted fabric. A method in which both filaments are aligned and supplied to the knitting machine is preferable because the uneven distribution effect becomes remarkable.

Although there is no particular limitation on the method of producing the composite yarn,
A method and a composite condition in which the cellulose multifilament is unevenly distributed in the sheath and the synthetic fiber multifilament is unevenly distributed in the core are preferable. For example, a method of false-twisting before or after intermingling with air-mixed fiber, which is called an interlace, is preferable, and a method of false-twisting after intermingling with air-mixed fiber is more preferable. As the false twisting device, any device capable of performing false twisting and capable of heating in the false twisting zone and the set zone after untwisting may be used, and generally used pin type, friction type, belt nip type, air twisting, etc. A type or the like can be used. In addition, an apparatus capable of continuously performing mixed fiber entanglement and false twisting is preferable because of good productivity. The composite yarn is knitted by a known device and conditions. The composite knitting and other filaments may be used to perform on-machine knitting.

The knitted fabric in the present invention may be subjected to known processing such as functional processing by a conventional resin processing or tumbler processing or texture processing within a range that does not impair the object of the present invention. The use of the cool knitted fabric in the present invention is not particularly limited, but is suitable for use in direct contact with the skin such as innerwear, intimate, nighty, and polo shirts. Suitable for.

[0033]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited to the examples. The knitted fabric characteristics in the examples were measured by the following methods. (1) Surface occupancy of cellulose multifilament (%): The cellulose multifilament is dyed with the following blue direct dye, and the obtained fabric is 30 mm × with image analysis software “IP-1000PC” manufactured by Asahi Kasei Corporation.
The image is captured in an image at a resolution of 600 dpi within a range of 30 mm, binarized, and analyzed for an area ratio. Dyeing recipe Sirius Supra Blue G 1% owf boil 30 minutes

(2) Heat release amount (W / m ² · ° C.): Using a Thermolab II manufactured by Kato Tech Co., Ltd., at a temperature of 20 ° C. and 65% RH, a 15 cm square sample was placed on the back side of a hot plate (clothing was turned on). (The surface that will become the skin side at the time), and then put a Styrofoam frame (thickness: 3 mm), fix it with drafting tape (manufactured by Nichiban) from above, and wind velocity 0.2 m
The amount of heat required to maintain the hotplate at 30 ° C./s is measured. (3) Surface roughness: KES manufactured by Kato Tech Co., Ltd.
The sample set load was set to 200 g for the back side of the sample of 20 cm square (the surface that becomes the skin side when it became clothes), and the contact was set to a contact load of 10 using a 0.5 mm x 5 mm steel wire.
The surface unevenness value (SMD) in each of the vertical and horizontal directions of the sample is measured at a moving speed of 1 mm / s with gf. Obtained S
Of the MDs, the one with the larger value in the vertical and horizontal directions is selected and divided by the number of protrusions between the measurement distances of 2 cm read from the corresponding measurement chart to obtain the degree of surface unevenness.

(4) Coefficient of surface friction: K manufactured by Kato Tech
Using the ES, set the sample load on the back side of the 20 cm square sample (the side that becomes the skin side when it becomes clothes) by 200
g, and the contact is made of 0.5φ × 5 mm steel wire.
The friction coefficient (MIU) in each of the longitudinal and lateral directions of the sample is measured at a moving speed of 1 mm / s at a contact load of 50 gf, and the average value in the longitudinal and lateral directions is used as a target surface friction coefficient. (5) Water infusion (%): A 7 cm square sample is placed on a 10 cm square glass plate so that the back side (the side that becomes the skin side when it becomes clothes) faces up, and 0.8 ml of water is dripped gently. Then, after standing for 10 minutes, a weight-measured 10 cm square filter paper, a 10 cm square glass plate, and a load of 500 g are placed on the filter paper. After standing for 10 seconds, the weight increase of the filter paper is weighed. Weight increase of filter paper (g) /0.8
(G) × 100 is set as the target amount of water supply.

(6) Degree of humidity transfer: using Thermolab II manufactured by Kato Tech Co., Ltd. at 20 ° C. and 65% RH environment
A Saran wrap (registered trademark, manufactured by Asahi Kasei Kogyo Co., Ltd.) is stuck on a hot plate at 30 ° C. so that air does not enter, and an acrylic resin frame (15 cm square, 5 mm thick, a 10 cm square hole in the center, and 15 polyester monofilament yarns
and placed on the back side of the 15 cm square sample (the side that becomes the skin side when it becomes clothes) facing the hot plate side, and further on the top. An acrylic resin frame (15 cm square, 5 mm thick, with a 10 cm square hole in the center) is placed. After standing for 15 minutes, the amount of heat W ₁ (W) required to keep the hot plate at 30 ° C. is measured. Then the W _1, except that placed a filter paper of 9cm angle impregnated throughout the water 2.5ml installed in the same manner as when measured on Saran wrap, keep 20 minutes standing, a hot plate to 30 ° C. The amount of heat W ₂ (W) required for the measurement is measured. The humidity transfer degree T is calculated by the following equation (4). T = {(W ₂ −W ₁ ) /6.08} × 46.944-1.022 (4)

(7) Wet friction coefficient: 15 cm using a KES-SE cloth friction tester (manufactured by Kato Tech Co., Ltd.)
^The coefficient of kinetic friction when the test cloth impregnated with 0.3 g of water per ² and the acrylic plate are rubbed under KES standard conditions is measured. (8) Cooling index (SB, SN): Calculate by substituting the measured values of the heat release, the surface irregularity, the surface friction coefficient, the amount of water transferred, and the degree of humidity transfer into the above-described equations (2) and (3). I do. (9) Weight (g / m ² ): Measured according to JIS-L-1096 weight test method. (10) Thickness (mm): Measured according to JIS-L-1096 thickness test method. (11) Airflow resistance (Pa · s / m): KES-F8-AP
1 Measured under standard conditions using an airflow resistance measuring device (manufactured by Kato Tech).

(12) Wearing test: Five men of M size who sewed the produced knitted fabric to a men's undergarment of U-neck short sleeve M size were used as monitors, and rested in an environment of 30 ° C. and 80% RH for 15 days.
A wearing test was performed using a profile of walking exercise of 4 km / h for 15 minutes and resting for 15 minutes. After resting and walking, the sensory evaluation of the refreshing feeling, the sticky feeling, and the overall wearing feeling was performed on a scale of 0 to 5 grades. In this sensory evaluation, a wearing test was performed twice before and after washing, and the average was used as the evaluation result of each knitted fabric. In addition, the evaluation of 6 grades is excellent in cool feeling, without stickiness, and when it is excellent in overall wearing feeling, it is grade 5;
When each item was extremely uncomfortable, it was classified as 0 grade, and this was classified into 6 levels.

Examples 1 to 7 and Comparative Examples 1 to 4 Knitted fabrics were produced under the conditions shown in Tables 1 and 2. In addition,
Viscose method rayon (manufactured by Asahi Chemical Industry Co., Ltd.) containing 0.8% by weight of titanium oxide having a 50% average particle diameter of 0.7 μm (excluding Example 7) as a cellulose multifilament.
And a polyethylene terephthalate multifilament (trade name: Technofine, manufactured by Asahi Kasei Kogyo Co., Ltd.) having a degree of irregularity of 1.55 and a W-shaped cross section as a synthetic fiber multifilament.
An 8GG circular knitting mill was produced. After smelting and relaxing these knitted fabrics at 80 to 90 ° C. using a liquid jet dyeing machine, they were lightly exposed to a hydrogen peroxide solution, and the characteristic results measured for the obtained knitted fabrics are shown in Tables 1 and 2. Was.

The knitted fabric of the present invention (Examples 1 to 7) has a cooling index of 1 or more in both a sweaty environment (SB) and a sweaty flow environment (SN), indicating that the fabric has excellent cooling properties. Is shown. In addition, the coefficient of friction when wet is small,
The feeling of stickiness is small even after absorbing sweat, the ventilation resistance is small and the wind easily passes. Also, there is little change in physical properties before and after washing,
Its excellent features can be maintained even after washing. Furthermore, since each of the physical properties is extremely excellent, it is possible to realize that it is excellent in a cooling feeling and a sticky feeling even in a wearing test, and the overall wearing feeling is also very good. In addition, the knitted fabric obtained in Example 7 was excellent in the refreshing feeling and sticky feeling in the wearing test, but was transparent because of not containing titanium oxide, and the overall evaluation was lowered.

On the other hand, in Comparative Example 1, the single-filament fineness of the cellulose multifilament was less than 7 Dtex, the surface unevenness, the surface friction coefficient, the friction coefficient when wet were poor, the refreshability was poor, and the change in physical properties after washing was poor. It was remarkable. In Comparative Example 2, the cooling index was excellent, but since the single-fiber fineness of the cellulose multifilament exceeded 30 Dtex, the feel was poor and rough, and the overall wearing feeling was reduced. In Comparative Example 3, the filament fineness ratio was less than 2, the heat radiation amount, the humidity transferability, and the like were poor, and the cooling index was less than 1.
In Comparative Example 4, since the filament fineness ratio exceeded 7, the physical property change after washing was remarkable. From the above results, by optimizing the single-filament fineness of the cellulose multifilament, the filament fineness ratio, and the surface occupancy of the cellulose multifilament to satisfy the requirements of the present invention, it is excellent in refreshability and excellent in wearing feeling. It can be seen that a knitted fabric is obtained.

[0042]

[Table 1]

[0043]

[Table 2]

Comparative Example 5 In Example 4, the knitting machine supply tension ratio of the cellulose multifilament and the synthetic fiber multifilament was 0.5.
And the surface occupancy of the cellulose multifilament is 7
A knitted fabric was obtained in the same manner as in Example 4 except that the content was less than 0%. The characteristics of the obtained knitted fabric were measured, and the results are shown in Table 2. However, since the feeding tension ratio of the knitting machine was not appropriate, the surface occupancy of the cellulose multifilament was less than 70%, and the heat release amount and the degree of surface unevenness were reduced. Inferior, the cooling index was less than 1. Therefore, the refreshing feeling and the overall wearing feeling when worn are reduced.

Comparative Examples 6 and 7 In Example 2, the synthetic fiber multifilament was a circular cross section having a degree of irregularity of 1 (Comparative Example 6) and a degree of irregularity of 1.13.
(Comparative Example 7), and a knitted fabric was obtained in the same manner as in Example 2 except that polyethylene terephthalate multifilaments having 33Dtex18 filaments were used. The characteristics of the obtained knitted fabric were measured, and the results are shown in Table 3. As shown in FIG.
Since it was less than 2, it was found that both the water volume and the coefficient of friction when wet were inferior, a sticky feeling was felt, and the sweat treatment function was inferior.

Comparative Example 8 In Example 1, 110 Dtex 15 filaments (single yarn fineness 7.
A knitted fabric was prepared in the same manner as in Example 1 except that polyethylene terephthalate multifilament (3Dtex) was used, and the characteristics of the obtained knitted fabric were measured. The results are shown in Table 3. Since the obtained knitted fabric was 100% of synthetic fiber multifilaments and had no hygroscopicity, the heat release amount, the humidity transferability were poor, and the cooling index was also poor.

Comparative Example 9 A knitted fabric was prepared in the same manner as in Example 1 except that a cotton yarn having a count of 120 was used instead of the cellulose multifilament, and the characteristics of the obtained knitted fabric were measured. The results are shown in Table 3, but because of the short fibers,
The yarn itself had excessive swelling, high airflow resistance, poor air permeability, poor heat dissipation, and poor cooling. Further, the coefficient of friction when wet after washing was increased, and a sticky feeling was felt. Example 8 and Comparative Example 10 In Example 2 or Comparative Example 1, each knitted fabric was produced in the same manner as in Example 2 or Comparative Example 1 except that the knitted fabric structure was smooth circular knitting, and the obtained knitted fabric was obtained. The characteristics of the ground were measured, and the results are shown in Table 3. It was found that a knitted fabric excellent in refreshing property and wearing feeling can be obtained regardless of the knitting structure, if the requirements of the present invention are satisfied.

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[Table 3]

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According to the knitted fabric of the present invention, the knitted fabric has functional properties such as moisture absorption, sweat treatment function, and coolness suitable for high temperature and humidity in Japan in a summer environment or in an environment where sweat is flowing. In this case, it has excellent cooling properties, has less sticky feeling due to sweat, and has an excellent wearing feeling. In addition, even after repeated wearing and washing, there is little change in physical properties, and the above excellent properties can be maintained. Therefore, the cool knitted fabric of the present invention has innerwear,
It is suitable for use in direct contact with skin such as Intimate, Nighty and Polo shirts, and is particularly useful as a gentleman's underwear for which no satisfactory product has been obtained.

Claims (1)

[Claims] 1. A knitted fabric comprising cellulose multifilaments and synthetic fiber multifilaments having irregularities of 1.2 to 2.2, wherein said cellulose multifilament fineness (D ₁ ) and synthetic fiber multifilament fineness (D ₂₎ ratio) (D ₁ / D ₂₎ is at 2-7, and fineness of the filaments constituting the cellulose multifilament is 7～30Dtex, surface coverage of the cellulose multifilament in the knitted fabric surface 70 1
Cool knitted fabric characterized by being 00%.