JP3219992B2 - Water-repellent knitted fabric with excellent mobility when wet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knitted fabric suitable for outdoor clothing such as sportswear and work clothes, which has a low exercise restraint property when wet due to sweating or rainfall from the human body, has a good water repellency. It is about.

[0002]

2. Description of the Related Art Conventionally, waterproof / water-repellent fabrics obtained by coating or laminating cotton or synthetic fiber fabrics with various waterproof / water-repellent agents have been widely used mainly for rain gear and the like.

[0003] However, the conventional waterproof / water-repellent fabrics described above have a particularly poor air permeability, resulting in 1 cc / cm ² · sec.
There is a problem that there is no air permeability higher than the above, and since the feel when touching the skin is cold and the skin feels sticky when sweating, the wearing comfort is poor.

[0004] In order to solve this problem, there is also known a device provided with a mesh lining, but it has not been possible to solve the problem caused by low air permeability even if the texture is slightly improved. .

On the other hand, as a method for solving the above problem,
For example, a high-density water-repellent fabric whose surface is covered with a loop of fine fibers is known (JP-B-63-36381).
No.).

[0006] These fabrics are characterized by having waterproofness and water repellency, as well as moisture permeability that cannot be obtained with rubberized fabrics, and have significantly improved wearing comfort during rainfall.

However, regarding the low air permeability,
The high-density type moisture-permeable waterproof / water-repellent cloths are similar to some extent, and those having a permeability of 10 cc / cm ² · sec or more have not been known.

[0008] Accordingly, even in a garment using a high-density type moisture-permeable waterproof / water-repellent cloth having relatively high moisture permeability and air permeability, when sweating, the user feels stuffy or hot, and has a sticky feeling, resulting in poor comfort. I used to do it.

[0009] In particular, sportswear worn in sports such as soccer, rugby, marathon, triathlon, baseball, golf, mountain climbing, cycling, and the like, in which the game continues even if it rains, and also stops work during rain. The following problems occur in the work clothes worn when it is not possible.

(1) The clothes that have absorbed the rain take away the heat of the body and cool the human body more than necessary. (2) Clothes absorb not only sweat but also rain and become heavier, and at the same time adhere to the skin and increase the sticky feeling (wet friction force). .

However, the conventional moisture-permeable waterproof / water-repellent fabrics could not solve these problems.

[0012]

SUMMARY OF THE INVENTION The present invention solves the problems of the conventional moisture-permeable waterproof / water-repellent cloth, and has high waterproofness and water-repellency, high air permeability, and high rainfall. It is an object of the present invention to provide a fabric with low movement restriction, that is, a water-repellent fabric excellent in motility when wet, without causing stuffiness or stickiness even when wet with sweat.

[0013]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have used a knitted fabric having good breathability and stretchability, and have also made it possible to use a waterproof garment or a thatched roof. Inspired by the combination of water, water repellency and air permeability, and the fact that the legs of Amembou with extremely fine hair do not get wet with water, the surface of the knitted fabric is cut with water-repellent fiber With the idea of increasing waterproofness and water repellency by covering, the present invention was completed.

That is, according to the present invention, (1) a knitted fabric composed of water-repellent fibers, the stretch ratio of which is at least 15% in at least one of the course direction and the wale direction. And the surface is covered with the cut fluff of the water-repellent fiber, and further, the wet friction of the knitted fabric.
A water-repellent knitted fabric excellent in moistness when wet, characterized in that the force is 80 g or less ; (2) air permeability of the knitted fabric is 10 to 34
(1) The water-repellent knitted fabric excellent in wet mobility described in (1) above, which has an initial water pressure of 100 mm or more, water repellency of 80 or more, and WIRA of 0 cc / cm ² · sec.
Excellent water repellency knitted product when wet motility water absorption above 20% or less (1) or (2) wherein there is provided by law.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The water-repellent fibers used in the present invention are fibers made of a hydrophobic synthetic polymer such as polyester, polyamide, polyolefin and polyacrylonitrile, and those fibers treated with a waterproofing agent and a water-repelling agent. The fibers themselves are hydrophilic, such as cotton, hemp, rayon and the like, but also include fibers which have been given water repellency by treatment with a waterproofing agent and a water repellent.

The fineness, cross-sectional shape and the like of these fibers can be arbitrarily used, and false twisted crimped yarn, fluid bulky textured yarn, composite crimped yarn and the like may be used.

Further, in the present invention, in order to reduce the exercise restraint when wet with rain or sweat, that is, to improve the wet exercise, it is necessary that the fabric has stretchability. Therefore, it needs to be knitted. The knitting structure may be any structure such as circular knitting and warp knitting.

Further, the knitted fabric of the present invention has an air permeability of 10 to 3
It is preferably 40 cc / cm ² · sec, more preferably 100 to 320 cc / cm ² · sec.

If the air permeability is less than 10 cc / cm ² · sec, the sudden increase in humidity inside the clothes cannot be suppressed when wet with rain or sweat, resulting in stuffiness and stickiness, resulting in poor mobility. May worsen.

Further, the air permeability is preferably as high as possible in order to lower the humidity inside the clothes, but is preferably 340 cc.
/ Cm ² · sec, sufficient waterproofness (for example,
(Initial water pressure of 100 mm or more) is not obtained, and it is not preferable because rain may penetrate into clothes even if it is slightly wet.

Here, the air permeability refers to JIS L1079.
Refers to the value measured by the Frazier-type air permeability tester described in (1).

In order to obtain such air permeability, the density of the knitted fabric used in the present invention should be 36 / inch to 55 in at least one of the wale direction and the course direction.
Suitably, books / inch.

If the density of the knit is too high, 10 cc / cm
^It becomes difficult to obtain an air permeability of ² · sec or more, and furthermore, the stretchability is reduced, and the restraint of movement when wet is increased.
On the other hand, if the density of the knit is too low, the initial water resistance decreases,
Rain easily permeates the cloth and penetrates into clothes.

Further, the thickness of the knitted fabric needs to be a certain thickness in order to secure a predetermined initial water resistance (preferably 100 mm or more), and the thickness is suitably 100 g / m ² or more.

Further, the surface of the knitted fabric of the present invention needs to be covered with cut fluff of water-repellent fibers. here,
The cutting fluff is different from the above-mentioned loop, and refers to a state in which the fluff has a free end by cutting the fiber.

In order to cover the surface of the knitted fabric with the cutting fluff, the surface of the knitted fabric may be raised with a needle cloth or the like.

The reason why the surface of the knitted fabric is covered with the cutting fluff is to enhance the water repellency and waterproofness of the highly permeable knitted fabric.

That is, in the present invention, the air permeability is 10 c
A knitted fabric having a relatively low density and a large inter-filament void is used so as to have a c / cm ² · sec or more. However, as it is, water resistance is low, rainwater easily penetrates into the knitted fabric, and sufficient water repellency is obtained. Water resistance cannot be obtained.

Therefore, the surface of the knitted fabric is covered with fluff to close the gap between the yarns, thereby improving water repellency and waterproofness.

In this case, the fluff acts like a kind of valve, and when the humidity inside the knit increases, the fluff is pushed up to open the yarn gap, and the moisture inside the knit is discharged. With respect to rainwater from the outside of the knitted fabric, the fluff falls down and closes the gap between the yarns, thereby preventing rainwater from entering.

Further, if there is fluff, a large amount of air is contained in the minute gaps between the fluff, and this air has a function of repelling water, so that the water repellency and waterproofness are further enhanced.

At this time, when the fluff on the surface of the knitted fabric is a loop having both ends fixed as described in JP-B-63-36381, it is difficult to form minute voids between the fluffs. Since the amount of air contained is reduced, water repellency and waterproofness are reduced.

When hydrophilic fibers such as cotton, hemp, rayon and the like are used in the knitted fabric of the present invention, the fibers must be made water-repellent by a water-repellent treatment, and fibers made of a hydrophobic synthetic polymer such as polyester and polyamide are used. When used, it is preferable to perform a water-repellent treatment.

The water repellent treatment can be performed by any conventionally known method. As the water repellent, a fluorine resin water repellent, a silicone resin water repellent, or the like is used.

Further, the knitted fabric of the present invention can improve the mobility when wet, and can be used in the course direction and the well direction.
It is necessary that the stretch ratio in at least one direction is at least 15%, preferably at least 30%, more preferably at least 50%.

Here, the stretch ratio is defined by JIS L1
080 means the elongation at 1.5 kg load.

Further, the knitted fabric of the present invention has an initial water pressure of at least 100 mm, a water repellency of at least 80 points, and a WIRA in order to prevent rainwater and the like from penetrating into the knitted fabric and obtain sufficient water repellency and waterproofness. The water absorption by the method is preferably 20% or less.

Here, the initial water pressure and water repellency are measured according to JIS.
L1079 is a value measured by the method described in
The water absorption by the IRA method is measured by the method described in JIS L1092.

In the case of clothing used in the outdoor field, in particular, a cloth used for sportswear, when it rains a little, it is necessary to prevent the clothes from getting wet in the rain and invading into the clothes to take away the body heat. It is required to prevent raindrops from being flipped on the surface and penetrating into the fabric to prevent the wearing comfort from being significantly reduced. However, the initial water pressure, water repellency and WI are required.
By setting the water absorption according to the RA method as described above, it is possible to satisfy such a requirement.

Next , the knitted fabric of the present invention has a wet friction force of 80.
g there is a need to be following.

As is generally known, when the cloth of clothes absorbs a large amount of moisture due to being wet by rain or sweating from the human body, a sticky phenomenon occurs.

The following two causes are considered. One is that water enters into the gap between the skin and the clothing material, and the surface tension of the water causes the two to adhere to each other. In addition, as in the case where two wet glasses are overlapped, It is considered that a pseudo-vacuum state was formed by water.

The other is an increase in the frictional force (F) with clothes when the human body moves. It is known that the friction force (F) satisfies the relationship of F = μN between the normal resistance (N) and the friction coefficient (μ) between two substances.

If the garment material absorbs a large amount of water as much as 50% or more of its own weight, the weight of the garment increases and the normal force (F) on the friction surface increases. In particular, since most of the weight of the garment is shared by the shoulder and the shoulder yoke portion, for example, the movement of raising the shoulder causes the movement of the wet fabric material to be restricted.

Therefore, in order to minimize the movement constraint due to these wet fabrics, it is important to increase the water repellency of the fibers and reduce the water absorption so that the weight of clothes does not increase.

Here, as means for evaluating the exercise restriction,
Wet friction was defined. That is, as shown in FIG.
A metal roller 1 of 8 cm in diameter with a polished surface, a length of 15 cm
A cloth (sample) 2 to be measured having a width of 6 cm and a width of 6 cm is placed thereon, and one end thereof is a stress strain gauge (U gauge).
3 attached to the lower end, 1 to tighten the fabric 2
Attach 0 g of clip 4.

Next, while rotating the metal roller 1 in the direction opposite to the U gauge 3 at a surface speed of 7 cm / sec, exactly 1 cc of water is gently injected between the metal roller 1 and the cloth 2 with a syringe. . At this time, the tension applied to the cloth 2 was measured via the U gauge 3 and recorded by the recorder 5, and the maximum value was defined as the wet friction force, and was used as an objective measurement value of the sticking force.

Actually, when a similar simulation test was performed using the inside of a human forearm, a good match was obtained with this wet friction force, and when the wet friction force was 80 g or less, the sticky feeling was suppressed. It has been found that this is preferable in reducing the motion constraint.

[0049]

The present invention will be described below in more detail with reference to Examples and Comparative Examples.

[Examples 1 to 3, Comparative Examples 1 to 4] Knit a tricot knitted fabric by using a 50 denier / 36 filament polyester filament yarn and changing the density and the basis weight of the knitted product as shown in Table 1. After brushing by the usual method,
After padding with the following fluororesin water-repellent treatment solution (all compositions are expressed in weight%), after drying at 100 ° C,
Heat treatment was performed at 180 ° C. for 30 seconds to obtain knitted fabrics having different stretch ratios in the course direction as shown in Table 1.

(Fluorine resin water-repellent treatment solution) Asahigard AG710 (trade name, Meisei Chemical) 5.0% Unicale Resin 380K (trade name, Union Chemical) 0.3% Sumitex Aliseleta ACX (trade name, Sumitomo Chemical ) 0.1% water 93.6%

The resulting knit was measured for thickness, air permeability, initial water resistance, water repellency, water absorption by WIRA method, and wet frictional force. Table 1 shows the results.

Further, a sportswear is sewn on the knitted fabric and a wearing test is performed. When the sportswear does not have any stuffiness or stickiness even when it is wet with rain or sweat, the mobility when wet is not restricted. ◎, when there is almost no stuffiness or sticky feeling and there is no problem in motility when wet, ○ when there is stuffy or sticky feeling, or when water enters the inside of the clothes, the motility when wet is restricted. The case was indicated by x.

Further, for comparison, the knitted fabric which was not raised in Example 2 (Comparative Example 2), the knitted material which was not raised and water-repellent (Comparative Example 3), and the same basis weight and ventilation as in Example 3 were used. A test was similarly performed on a plain woven fabric having a degree (Comparative Example 4). Table 1 shows the results.

[0055]

[Table 1]

As is evident from Table 1, the knitted fabrics of the present invention (Examples 1 to 3) had extremely good mobility when wet. On the other hand, the stretch rate in the course direction is 15
% (Comparative Example 1), stuffiness and stickiness were generated, and the mobility was deteriorated.

In the case of no raising (Comparative Example 2) or no water-repellent treatment (Comparative Example 3),
When the woven fabric was used without using the knitted fabric (Comparative Example 4), the stretchability was low, and the motility when wet was inferior.

[Examples 4 and 6, Comparative Examples 5 and 7] Using a 100 denier / 48 filament polyester filament yarn, the density and basis weight of the knitted product were changed as shown in Table 2 to produce a honeycomb mesh knitted fabric. After knitting and raising by a conventional method, padding treatment with the above fluororesin water-repellent treatment liquid, drying at 100 ° C., and heat treatment at 180 ° C. for 30 seconds, stretch ratio in the course direction as shown in Table 2 Different knits.

The obtained knitted fabric was measured for thickness, air permeability, initial water pressure resistance, water repellency, water absorption by WIRA method, and wet frictional force, and further subjected to a wear test. Table 2 shows the results.

Further, for comparison, a test was similarly performed on the knitted fabric which was not raised in Example 5 (Comparative Example 6) and the knitted product which was not raised and did not undergo water-repellent treatment (Comparative Example 7). Table 2 shows the results.

[0061]

[Table 2]

As is clear from Table 2, the knitted fabrics of the present invention (Examples 4 to 6) had very good motility when wet. On the other hand, the stretch rate in the course direction is 15
% (Comparative Example 5), stuffiness and stickiness were generated, and the mobility was deteriorated.

In the case of no raising (Comparative Example 6) or no water-repellent treatment (Comparative Example 7),
Water resistance (initial water pressure resistance) was inferior, and mobility in wet conditions was inferior.

[0064]

The knitted fabric of the present invention has a high air permeability while maintaining sufficient waterproofness and water repellency, and does not generate stuffiness or stickiness even when wet with rain or sweat. It has excellent properties and is suitably used as clothing worn in the outdoor field, particularly as clothing for sportswear.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an apparatus for measuring a wet friction force.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal roller 2 Fabric (sample) 3 Stress strain gauge (U gauge) 4 Clip 5 Recorder

──────────────────────────────────────────────────続 き Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) D06M 15/00-15/715 D04B 21/00 D06C 11/00

Claims (3)

(57) [Claims] 1. A knitted fabric composed of water-repellent fibers, wherein the stretch ratio in at least one of the course direction and the wealth direction of the knitted fabric is 15% or more, and the surface thereof is A water-repellent knitted fabric excellent in mobility when wet, characterized in that the knitted fabric is covered with cut fuzz of water-repellent fibers and has a wet frictional force of 80 g or less . 2. The air permeability of a knitted fabric is 10 to 340 cc / cm.
^{2. The} water-repellent knitted fabric according to claim 1, which is ² · sec. 3. The knitted fabric has an initial water resistance of 100 mm or more, a water repellency of 80 points or more, and a water absorption of 20 by the WIRA method.
%. The water-repellent knitted fabric according to claim 1 or 2 having excellent mobility when wet.