JPH09302553A - Pile fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pile fabric composed of a pile yarn, etc., containing a prescribed amount of a hygroscopic crosslinked acrylate-based fiber, capable of readily drying, excellent in pH buffering property, antimicrobial property, deodorizing property, pilling resistance, water absorbing property and stretchability and useful for bath towel, etc. SOLUTION: In this pile fabric, a pile yarn is the one containing >=20wt.% hygroscopic crosslinked acrylate-based fiber, and further in details, containing an acrylic fiber and a cellulosic fiber, and its ground structure is constituted of a conjugated yarn having 50-150% degree of shrinkage, and an ether-based polyurethane filament is used as the core part and cellulosic fiber as its sheath part. Furthermore, >=70% of the surface of the core part is covered with the sheath part and elongation in warp and/or weft directions is preferably >=50% under 1.5kg load and elongation recovery is preferably >=70%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile cloth, and more particularly to a pile cloth which has many functions and can be used in various fields.

[0002]

2. Description of the Related Art Pile cloth represented by towel cloth is
It is mainly used for the purpose of wiping off moisture from the wet body and hair, as well as sweat, etc. From such a viewpoint, conventionally, 100% cotton with good water absorption and hygroscopicity was often used as the material ( Conventional example). However, 100% cotton, as in the above-mentioned conventional example, was inferior in elasticity, and thus was inconvenient to use.

Therefore, a towel fabric having improved stretchability is proposed in Japanese Utility Model Laid-Open No. 62-166282 (conventional example). The conventional example uses a yarn having moisture absorption and water absorption for the pile yarn,
And weaving using elastic yarns such as elastic synthetic fiber filament yarns as warp and / or weft yarns,
Alternatively, it has an extension ratio of 10% or more in the lateral direction.

In addition, JP-A-3-249246 proposes a loop-shaped towel which is excellent in texture as a towel, easily absorbs water when wrapped around hair or the like, and is hard to slip off. Yes (conventional example). In the conventional example, 70% or more consists of a false twisted yarn of acrylic long fibers and a water absorbent fiber (of which 50 to 90% is a false twisted yarn of acrylic long fibers), and the others are polyamide or It consists of filament twisted yarn consisting of polyester and polyurethane, and has a elongation of 50% or more of the original length when a load of 5 kg is applied to this towel, and within 5 seconds when the load is removed. In addition, it has a degree of recovery that returns to an elongation of 10% or less.

[0005]

As described above, pile fabrics have been proposed that retain water absorption and hygroscopicity, and have stretchability and good texture. However, due to the current diversified uses of pile fabrics, Looking at it, there is a problem that needs further improvement.

That is, for example, in the above conventional example, water absorption
Although it has moisture absorption performance, it has not been examined for water absorption / moisture absorption rate, easiness of drying and the like. Further, in the above-mentioned conventional example, the recoverability upon repeated use greatly changes depending on the type of synthetic fiber filament having stretchability or the yarn form, so this point also needs to be examined. Further, when the elastic yarn is exposed, there is a problem that not only the texture is bad, but also the elastic yarn gradually deteriorates after a long period of time and the stretchability deteriorates.

The characteristics such as water absorption and moisture absorption rate as described above are important and should be examined. In addition, recently, pile fabrics having various functions are desired due to the diversification of applications. ing.

Therefore, the present invention has investigated the problems left over from the above-mentioned conventional examples in terms of stretchability and water absorption / moisture absorption characteristics, and, in addition, various other functions such as antibacterial property, deodorant property and antipilling property. The purpose of the present invention is to provide a pile fabric having properties such as anti-static property, antistatic property and pH buffering property. The pile cloth having the pH buffering property is kind to the skin, and the above-exemplified functions are highly demanded by users.

[0009]

In the pile fabric according to the present invention, the pile yarn has a hygroscopic crosslinked acrylate fiber.
It is a yarn containing 0% by weight or more and has a ground structure of 50 to 15
The gist is that the yarn is composed of a composite yarn having a stretch ratio of 0%.

The hygroscopic crosslinked acrylate fiber is 2
It has a saturated moisture absorption of 15 to 35% by weight at 0 ° C and a humidity of 65%, and it has good water absorption and is easy to dry. In addition, it has antibacterial, deodorant, pilling, and antistatic properties. , P
It also has H-buffering as a harmony function.

The pile fabric of the present invention reflects the above-mentioned various functions in the product by including the hygroscopic crosslinked acrylate fiber in the pile yarn. Thus, in order to exhibit the above-mentioned function in the pile fabric, it is necessary to contain 20% by weight or more, and preferably 30% by weight or more, of the hygroscopic crosslinked acrylate fiber. The upper limit of the content is not particularly limited, but it is recommended to reduce the content of the hygroscopic cross-linked acrylate fiber as much as possible because it increases the cost. Further, by using a stretchable yarn for the ground structure, stretchability is imparted to the pile fabric.

The hygroscopic crosslinked acrylate fiber is preferably spun as a single fiber into a yarn. This is because the moisture absorption and water absorption are improved and the feeling of sliminess is eliminated as compared with the case of using filaments as filaments.

In addition, in the pile fabric according to the present invention, it is preferable that the pile yarn contains a cellulosic fiber in addition to the hygroscopic crosslinked acrylate fiber. This is because the cellulosic fibers have water absorption. Further, from the viewpoint that many users prefer cotton texture, it is recommended to mix cotton among cellulose fibers, and in order to develop the cotton texture, the content of the hygroscopic crosslinked acrylate fiber is It is desired that the amount is 70% by weight or less and the content of cotton is 30% by weight or more. In the pile fabric according to the present invention, it is preferable that the pile yarn is mixed with acrylic fiber in addition to the hygroscopic crosslinked acrylate fiber because the spinnability is improved.

Further, it is preferable that the ground structure is a composite yarn having an ether type polyurethane filament in the core and a cellulosic fiber in the sheath. By doing so, the texture and moisture absorption / water absorption preferred by the user can be exhibited in the sheath while ensuring elasticity in the core.

The above-mentioned ether-based polyurethane fiber has less creep development that occurs when it is repeatedly stretched and contracted,
In addition, it is preferable as a stretchable fiber because it is resistant to hydrolysis by moisture, water, alkaline soap and the like.

In addition, the sheath portion of the ground tissue contains hygroscopic crosslinked acrylate fibers in addition to the cellulose fibers.
More preferably, the content is at least wt%. This is because the above-mentioned various functions can be expressed from the ground tissue. Further, it is more preferable that the sheath portion contains an acrylic fiber for the same reason as described above.

Further, 70% or more of the surface of the core portion is preferably covered with the sheath portion, and more preferably 80% or more. In this way, the ether-based polyurethane filaments arranged in the core are covered with the fibers of the sheath and the exposed portion is reduced, so that the ether-based polyurethane filaments are prevented from being deteriorated by ultraviolet rays of sunlight. be able to.

Further, the pile fabric according to the present invention has a stretch rate in the warp and / or weft direction of 50% or more (1.
It is preferable that the elongation recovery rate be 70% or more. At this time, the yarn is 1.
It is necessary to have an elongation rate of 5 to 2.5 times, that is, 50 to 150%, and an elongation recovery rate of 70% or more. When the elongation rate is less than 50%, sufficient elongation cannot be obtained when the fabric is formed, while when it is higher than 150%, the elongation recovery rate is poor, and the elongation recovery rate of the yarn is also low. 70
If it does not exceed 50%, the instantaneous recovery rate when made into a fabric is 70%.
Because we cannot expect the above.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION As a method for obtaining the hygroscopic crosslinked acrylate fiber, acrylic fiber is used as a raw material fiber,
First, a crosslinked structure is introduced by hydrazine treatment to adjust the increase in nitrogen content within the range of 1.0 to 8.0% by weight.
Next, hydrolysis is carried out to introduce a carboxyl group into 1.0 to 5.0 meq / g of the amount of the remaining nitrile group and an amide group into the rest. Then, 50 to 90 mol% of the above-mentioned carboxyl group is added to Mg, Ca, Cu, Z
A metal salt of one or more metals selected from n, Al, Ag, and Fe, and then a dry heat temperature of 100 to
By performing a final heat treatment at 230 ° C., a hygroscopic crosslinked acrylate fiber is obtained.

When making a pile fabric, a yarn containing 20% by weight or more of the hygroscopic crosslinked acrylate fiber is used as a pile yarn, and a composite yarn having a stretch ratio of 50 to 150% is used as a ground structure. . A pile fabric of a woven fabric or a knitted fabric is manufactured by a pile woven method including warp threads, weft threads, and pile threads forming a ground structure, a circular knitting sinker pile method, or the like. Acrylic fibers and cellulose fibers are appropriately mixed and spun into the pile yarn as described above.

When the above ground structure is a composite yarn having a core-sheath structure, an ether polyurethane filament is used for the core, a cellulose fiber is used for the sheath, and a core yarn method or a spinning twisting method using a spinning machine is used. To make a composite yarn. Since these methods have a high degree of covering the core yarn, as described above, 70% or more of the surface of the core portion, or even 80%
The above can be covered by the sheath. Moreover, these above methods
It is possible to manufacture a composite yarn that is extremely exposed even during stretching.
The core yarn method is the most preferable in terms of high coverage. As described above, when the stretchable yarn is covered with other fibers and the exposed portion is as small as possible in the form of the composite yarn, deterioration of the stretchable yarn due to sunlight or the like is reduced. In addition, as for the above-mentioned coating ratio, the coating area ratio is obtained by using a 50 times micrograph.

In addition, as a method for producing a composite yarn having a core-sheath structure, a covering method was examined, and in the method, even when the covering twist number was considerably increased, when the composite yarn was stretched, The elastic yarn of the core was exposed, and it was a composite yarn that did not meet the purpose.

[0023]

EXAMPLES << 1 >> First, a hygroscopic crosslinked acrylate fiber will be described. Acrylonitrile 90% and Methyl Acrylate 1
0% acrylonitrile polymer was dissolved in 48% rhodanesoda aqueous solution, and the dissolved spinning dope was spun according to a conventional method, followed by washing with water, stretching, crimping, and heat treatment.
A raw material fiber (acrylic fiber) of 0.8 denier × 70 mm was obtained.

5 kg of 30% by weight of hydrous hydrazine was added to 1 kg of the raw material fiber, and cross-linked at 98 ° C. for 3 hours. The amount of increase in nitrogen was 5.0%. After washing the crosslinked fiber with water, 3
5 kg of weight% sodium hydroxide was added and hydrolysis was carried out at 90 ° C. for 2 hours. Then, it is treated with a 1N HNO ₃ aqueous solution to convert the carboxyl groups to H-form, followed by washing with water, then the pH is adjusted to 6.5 with 1N NaOH, and 50 g of calcium chloride is added, A metal salt treatment was applied at 2 ° C. for 2 hours.

After thoroughly washing this fiber with water, dehydration, oil treatment, and heat treatment (150 ° C.) were performed to obtain a hygroscopic crosslinked acrylate fiber. The characteristics of the obtained fiber are shown in Table 1 below. For comparison, the characteristics of cotton, wool, acrylic and polyester fibers are also shown in Table 1 below.

[0026]

[Table 1]

As can be seen from Table 1, the hygroscopic crosslinked acrylate fiber has a moisture absorption rate of 27%, which is about 3.
It is 8 times as high and has excellent hygroscopicity. Also with respect to water retention, the hygroscopic crosslinked acrylate fiber shows a water retention as high as that of cotton, and is a preferable fiber. In addition, it can be seen that the moisture absorption rate constant and the moisture release rate constant are small, the moisture absorption and water absorption rates are fast, and the material is easy to dry. Furthermore, the hygroscopic crosslinked acrylate fiber has an ammonia deodorizing rate of 99%.
It is clear that it has a high deodorizing function against ammonia, which is high as above.

The measuring method of each of the above characteristics is as follows. <Moisture absorption rate (%)> About 5.0 g of sample fiber is dried with a hot air dryer at 105 ° C for 16 hours, and the weight is measured (this is W
₁ g). Next, the dried sample fiber is placed in a thermo-hygrostat controlled at a temperature of 20 ° C. and a relative humidity of 65% for 24 hours, and the weight of the sample fiber thus absorbed is measured (this is W ₂ g). From these measurement results,
Calculate the moisture absorption rate using (1). Moisture absorption rate _{(%) = {(W 2} -W 1) / W 1} × 100 ... (1)

<PH buffering property (μeq / g)> About 0.4 g of sufficiently dried sample fiber was precisely weighed (this is defined as Xg), 200 ml of water was added thereto, and then 0.1N hydrochloric acid aqueous solution or Consumed hydrochloric acid aqueous solution or caustic soda aqueous solution until the pH reaches 5.0 when the 0.1N caustic soda aqueous solution is dropped and the above hydrochloric acid aqueous solution is dropped, and when the above caustic soda aqueous solution is dropped. Then, the amount of consumption of the above (assumed to be Ycc) is obtained, and the buffering capacity for acid or alkali is calculated using the following equation (2). pH buffering property (μeq / g) = 1000Y / X (2)

<Water retention rate (%)> 5 g of the sample knitted fabric is immersed in pure water, left at 30 ± 5 ° C. for 3 hours, and then dehydrated by a centrifugal dehydrator at 1000 G for 3 minutes. The weight of the dehydrated sample knitted fabric is measured (this is designated as W ₃ g). Next, the sample knitted fabric was dried in a hot air drier at 90 ° C. until absolutely dried, and the weight of the dried sample was determined (this is W ₄ g).
Calculate the water retention rate (%) using the following formula (3). Water retention rate _{(%) = {(W 3} -W 4) / W 4} × 100 ... (3)

<Moisture absorption rate constant: k ₁ (mm ⁻¹ )> 5 × 20
The sample knitted fabric having a size of cm is dried in a hot air dryer at 105 ° C and then cooled to 20 ° C in a desiccator. The sample knitted fabric is placed in a thermo-hygrostat adjusted to 20 ° C. and a humidity of 65% RH, and the moisture absorption rate (W _d ) from absolute drying is continuously measured every 120 minutes. The sample knitted fabric is further placed in a thermo-hygrostat for 24 hours,
The saturated moisture absorption rate (W _e ) is measured. The moisture absorption rate constant (k ₁ ) is calculated using the following rate equation (4).

[0032]

[Equation 1]

[0033] t: elapsed time from oven dry (min) W _d: moisture absorption rate at time t from the absolute dry _{(%) W e: 20 ℃} , 65% RH saturated moisture absorption rate (%) k _1: hygroscopic rate constant e : Natural logarithm

<Moisture release rate constant: k ₂ (mm ⁻¹ )> 5 × 20
The sample knitted fabric of cm is put in a thermo-hygrostat adjusted to 20 ° C and 80% RH for 24 hours, and saturated moisture absorption rate (W
_b ) is measured. Next, the sample knitted fabric is subjected to 20 ° C. and 30% R
It is put in a thermo-hygrostat adjusted to H and the moisture absorption rate (W _c ) is measured every 120 minutes. Furthermore, the sample knitted fabric was
Put it in a thermo-hygrostat adjusted to 0% RH for 24 hours, and
A saturated moisture absorption rate (W _e ) at 30 ° C. and 30% RH is measured. The moisture release rate constant (k ₂ ) is calculated using the following rate equation (5).

[0035]

[Equation 2]

[0036] W _c: W moisture absorptivity in _b from the time _{t (%) W a: 20} ℃, saturated moisture absorption rate at _{30% RH (%) W b} : 20 ℃, saturated moisture absorption rate at 80% RH (%) k ₂ : Moisture release rate constant t: up to 30 minutes (when continuously measured for 120 minutes, linearity was found up to 30 minutes, so a coefficient was calculated for 0 to 30 minutes.)

<Ammonia deodorization rate (%)> 2 g of sample fiber
In a Tedlar bag, sealed and infused with 3 liters of air. Next, 400 ppm of ammonia is injected into the Tedlar bag, left at room temperature for 120 minutes, and then the ammonia concentration (W ₆ : ppm) in the Tedlar bag is measured using a Kitagawa type detector tube. In addition, 400ppm of ammonia was injected into a Tedlar bag containing no sample fiber, and 1
After 20 minutes, the ammonia concentration (W ₇ : ppm) is measured, and this is used as a blank test. From the above results, the ammonia deodorizing rate is calculated using the following equation (6). Ammonia deodorizing rate (%) = {(W ₅ −W ₆ ) / W ₇ } × 100 (6) W ₅ : Ammonia concentration injected into the Tedlar bag (4
00ppm)

<< 2 >> Next, knitted fabric samples are manufactured using various fibers, and experiments relating to these are described. As shown in Table 2 below, the hygroscopic crosslinked acrylate fiber (1.8d × 38 mm) alone, or the fiber obtained by mixing the hygroscopic crosslinked acrylate fiber and the combed cotton at the blending ratio shown in Table 2 was used. According to a conventional method, card, kneading, spinning, and spinning were performed to spun a single yarn of 20th count. The twist coefficient was 3.5.

For comparison, a single yarn was similarly prepared from acrylic fiber, wool (using cut wool), cotton (using combed cotton), and polyester fiber (1.5d × 38 mm). These single yarns were knitted into a smooth knitted fabric using a 20-gauge double-sided knitting machine, and then dyed and finished by a conventional method. The characteristic values of these knitted fabric samples are shown in Table 2.

[0040]

[Table 2]

As can be seen from Table 2, the knitted fabric using 100% hygroscopic crosslinked acrylate fiber (knitted fabric No. 1) exhibits the same level of characteristics as the fibrils shown in Table 1 above. . In particular, the water absorption length is about 1.2 times that of a cotton knitted fabric, and the moisture absorption rate is about 3.8 times greater than that of a cotton knitted fabric. Nevertheless, the drying time is three times faster than that of cotton knitted fabric. In addition, the knitted fabrics Nos. 2 and 3 in which other fibers are mixed-spun exhibit the characteristics of the hygroscopic crosslinked acrylate fiber,
It can be seen that the performance equivalent to or higher than that expected from the blended spinning rate is exhibited. Therefore, knitted fabric Nos. 1-3 are
It can be seen that it is hydrophilic, dries quickly, and has little wet feeling.

The measuring methods of the above respective characteristics are as follows. <Water Suction Length (mm)> The suction length after 30 minutes from the start of measurement was determined based on the water absorption rate B method (Bayrec method) of JIS L 1018 knitted fabric test method.

<Drying time (minutes)> Sample knitted fabric 10 × 10 cm
After immersing it in pure water for 1 hour, use a centrifugal dehydrator for 30
Perform dehydration for 2 minutes at 0G rotation, 20 ℃, 65% R
Tensilon / UTM-11-20 type installed in the atmosphere of H,
The sample knitted fabric after the dehydration was attached, the weight change and time of the sample knitted fabric were measured, and the drying time in touch was obtained.

<Antibacterial properties> Sanitary processing council of textile products (SE
According to the method specified in K), a sterilized sample cloth was poured with a broth suspension of the test bacteria, and after culturing at 37 ° C for 18 hours in a closed container, the viable cell count was measured to obtain the following formula (7). , (8)
It is determined by the difference between the increase / decrease in the number B of the standard cloth and the number C of the sample in relation to the number A of inoculation. The test strain was Staphylococcus aureus (Stap
ylococcus aureus IFO 12732). Increase / decrease value = log C-log A (7) Difference in increase / decrease value = (log B-log A)-(log C-log A) (8)

<Anti-pilling property> The pilling test method A of JIS L 1076 woven and knitted products was carried out according to the method using an ICI type tester. <Antistatic property> The antistatic property was measured according to the JIS L 1094 woven fabric and knitting test method for static electricity.

<Elongation rate (%) and elastic extension rate (%) of stretchable composite yarn> It was measured according to the synthetic fiber filament bulky finished yarn test method shown in JIS L 1090. However, taking into account the characteristics of the core yarn, etc., the method of measuring the expansion and recovery rate of the same method was applied, and the first sample length was measured under standard temperature and humidity conditions, and the subsequent measurements were performed on the sample after boiling water treatment for 2 minutes. Carried out.

<< 3 >> Next, an example of manufacturing a pile fabric will be described. In consideration of the above results and the spinnability and operability in the spinning process, a yarn for pile fabric (20th single yarn) is used as a mixed spinning rate of 30% hygroscopic crosslinked acrylate fiber, 5% acrylic fiber and 65% cotton fiber. Made a thread). The 20th single yarn has the same count as the conventional cotton pile fabric.

As a yarn for the base fiber, a roving is produced at the same blending ratio as that of the pile yarn, and the roving is used as a sheath yarn in the spinning process, and the ether polyurethane filament 70 is used.
d (draft 4.0) was combined as a core yarn to form a core yarn. The twist coefficient was 4.5. As a result of measuring the elongation rate of the core yarn before and after the boiling water treatment, it was found to be 85%, which had the characteristics suitable for the purpose of the present invention. The method for measuring the elongation rate is as described below.

45 yarns of the above core yarn in the warp of the ground structure /
Pile fabrics for towels were produced by using inches, and by using 40 yarns / inch as a substitute for the pile yarn yarns as the weft of the ground structure and using 45 pile yarn yarns as pile yarns (pile fabric). No. 1). The obtained pile fabric N
o.1 has a longitudinal elongation of 65% and an elongation recovery of 85
%Met.

Next, a comparative pile fabric will be described.
In the pile fabric No. 1, an ether polyurethane filament was used for the core of the ground structure, but instead of this, an ester polyurethane filament 70d (draft 4.
0) was used as a core yarn, and a pile woven fabric for towels was manufactured by the same method and conditions as those of the pile fabric No. 1 (Pile fabric No. 2).

The pile fabric obtained as shown in Table 3 below.
The initial elongation rate and elongation recovery rate of No. 2 were almost the same as those of the pile fabric No. 1, but the elongation rate and elongation recovery rate after washing increased as the number of times of washing increased. The pile fabric No. 2 was inferior to No. 1.

[0052]

[Table 3]

The method for measuring the elongation rate and elongation recovery rate is as described below. <Textile elongation (%), elongation recovery (%)> JIS L 1096
According to the general woven fabric test method shown in B, the test was performed with a weight of 1.5 kg.

[0054]

The pile fabric according to the present invention has a pH buffering property, an antibacterial property, a deodorizing property, an antipilling property, an antistatic property, a water absorbing property,
A bath towel that satisfactorily expresses each function of easiness of drying and has elasticity and is used for temporarily wrapping up the body such as when using after bathing or after swimming. It can be used in various fields such as a towel for wiping off water after washing hair, a sports towel for wiping off a large amount of perspiration, a supporter, and a stretching exercise device.

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Claims (8)

[Claims] 1. A composite yarn in which the pile yarn in the pile fabric contains 20% by weight or more of a hygroscopic crosslinked acrylate fiber, and the ground structure of the pile fabric has a stretch ratio of 50 to 150%. A pile fabric characterized in that it is composed of 2. The pile yarn contains an acrylic fiber in addition to the hygroscopic crosslinked acrylate fiber.
The pile fabric according to item 1. 3. The pile fabric according to claim 1, wherein the pile yarn contains a cellulosic fiber in addition to the hygroscopic crosslinked acrylate fiber. 4. The pile fabric according to claim 1, wherein the ground structure is a composite yarn having an ether polyurethane filament in a core portion and a cellulose fiber in a sheath portion. 5. The pile cloth according to claim 4, wherein the sheath portion contains 20% by weight or more of a hygroscopic crosslinked acrylate fiber in addition to the cellulose fiber. 6. The pile fabric according to claim 4, wherein the sheath portion further contains an acrylic fiber. 7. The pile fabric according to claim 4, wherein 70% or more of the surface of the core portion is covered with the sheath portion. 8. The elongation rate in the warp and / or weft direction is 1.5.
It is 50% or more when weighted with kg, and the elongation recovery rate is 70%
It is above, The pile cloth in any one of Claims 1-7.