JP3418607B2 - Covering yarn - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polyamide fiber suitable for a knitted fabric material such as stockings, and a covering yarn and a stocking using the fiber.

[0002]

2. Description of the Related Art In recent years, support type stockings made of elastic yarn as a core yarn and covering yarn around which non-elastic thermoplastic synthetic filament yarn such as polyamide or polyester is wound are used as knitting yarns. Stocking has become the mainstream because of its high strength and good fit.

[0003] However, recent demands from consumers include high elasticity and fit, as well as sweat absorption and quick-drying performance, and a comfortable feeling when worn such as a proper crispness (dry texture). There is. In addition, stockings are becoming established as fashion clothing that makes legs look beautiful and slender, and fashionability such as fine gloss is demanded.

In order to satisfy such comfort and fashionability, it has been studied so far to make the cross section of the fiber to be coated different in shape. For example, Japanese Patent Publication No. 1-3965 discloses 1.20 to 1 as a covered elastic yarn (covering yarn) for socks formed by winding a covering yarn made of polyamide long fibers around a core yarn made of elastic fiber. A sock-coated elastic yarn using long fibers having a non-circular cross section having a cross-sectional shape factor of .60 is disclosed. In this publication, long fibers having a non-circular cross-section having a cross-sectional shape factor as described above are used as coated elastic yarns in comparison with long fibers having a normal circular cross-section, despite having low mechanical strength. In this case, conversely, the strength is greatly improved, and a coated elastic yarn excellent in mechanical strength and coatability is described.

However, among the modified cross-sectional shapes which have been studied so far, the multi-lobed cross section including the triangular cross section has a sharp feeling but has a sharp feeling, and when it is used as stockings, it cannot be said that it is comfortable when worn. However, the present situation is that stockings that have a glaring (glossy) appearance and have a favorable appearance have not been obtained. Further, there is a drawback that a knitted fabric such as a stocking having a beautiful knitting surface cannot be obtained because the bending stress of the fiber used for coating is large.

Further, as a fiber used for coating, as compared with the case where a fiber having a circular cross section is used, when a long fiber having a non-circular shape, particularly a triangular cross section is used, in a specific case, As described in the above-mentioned publication, the possibility of improving the mechanical strength of the covering yarn cannot always be denied, but generally, the mechanical strength of the covering yarn is lowered by using the fiber having a modified cross section. To do.

On the other hand, by using long fibers having a flat cross section as the covering yarn, a stocking having a soft texture can be obtained, but since it has no stiffness and no unevenness on the surface, it has a slimy feel and further has a gloss. It has the drawback that you can only get things that have a low feeling and low fashion. When used as stockings, it must have some luster in appearance to make the legs look neat and durable when worn, and also to differentiate from stockings that use long fibers with a normal circular cross section. It is useful as a means to make the cross section of the long fiber to be used irregular. Therefore, the present situation is to study and search for the optimum cross-sectional shape for stocking applications.

Recently, in the field of stockings as well, methods for imparting various functions in addition to gloss on appearance have been studied. However, the fact is that there is almost no functional covering yarn that gives unprecedented luster, wear durability, and comfort to the wearer.

[0009]

DISCLOSURE OF THE INVENTION The present invention has optimum functions for stocking use, in particular, water absorption / quick-drying performance and soft texture, and further, comfort such as fine glossy feeling and moderate sharpness. In addition, it is an object of the present invention to provide a polyamide fiber having a modified cross section that enables good covering, a covering yarn using the fiber, and a stocking using the covering yarn.

[0010]

Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the present inventors have made the cross-sectional shape of polyamide fibers into a specific shape, and as a polyamide,
By using polyhexamethylene adipamide and other thermoplastic polyamide together, it has excellent water absorption / quick drying performance, soft texture, fine gloss, moderate sharpness, and high toughness, stockings, etc. The inventors have found that a beautiful knitted surface can be obtained even when the knitted fabric is used, and that the stocking can be held without breaking through and the strength is extremely reduced, and the present invention has been completed.

That is, the present invention is as follows. 1. A covering yarn in which a core yarn made of elastic yarn is coated with a polyamide fiber having a W-shaped cross-sectional shape, a flatness of 2.0 to 5.0, and a toughness of 35 to 50 . 2. Polyamide fiber is hexamethylene adipamide 95
The covering yarn according to the above item 1, characterized in that the covering yarn comprises -60 wt% and a thermoplastic polyamide other than hexamethylene adipamide 5-40 wt% .

3. The covering jar according to 1 or 2 above.
Stockings using the Here, the toughness is a value calculated by the following equation (1).

Toughness = {strength (cN / dtex)} × {elongation (%)} ^1/2 (1) The present invention will be described in detail below. Since the polyamide fiber of the present invention has a W-shaped single yarn cross-sectional shape, when it is used for a covering yarn, an uneven portion is present in the cross section of the coated fiber, and when the unevenness of the single yarns overlaps each other, the groove portion thereof is formed. It has excellent water absorption and quick-drying performance due to capillary action. Further, compared with the conventional circular cross-section fiber, there is no extreme decrease in toughness, and when used in a covering yarn, the coverage of the core yarn is good due to the flatness that is a characteristic of the W-shape. Therefore, even after knitting in stockings or the like, even if the force is applied to the yarn evenly against the force perpendicular to the knitted fabric, irregularly-shaped cross-section fibers such as trilobes, tetralobes, or multilobes with poor coverage are formed. It is possible to provide a stocking with a higher breaking strength than that of.

Further, since the polyamide fiber of the present invention has a flat cross section having irregularities as described above, the bendability of the cross section in the minor axis direction is improved, and the soft texture, moderate crispness, and smoothness are obtained. You can get the texture. Moreover, since it has more reflective surfaces than three and four leaves, the reflected light is diffused at a wide angle, so there is no strong reflected light and it is reflected uniformly, giving a fine glossy feeling when knitted. It has characteristics.

In the polyamide fiber of the present invention, the polyamide is preferably formed from polyhexamethylene adipamide containing 5 to 40 wt% of a thermoplastic polyamide other than polyhexamethylene adipamide (nylon 66). . As a method of incorporating a thermoplastic polyamide other than polyhexamethylene adipamide,
A monomer or polymer may be added before or during the polymerization of polyhexamethylene adipamide to form a copolymer, or a mixture of other polyamides added to polyhexamethylene adipamide before or during spinning. It may be used as a body (blend). A method combining them may also be used.

Other thermoplastic polyamides include monomers and / or polymers such as polycaprolactam (nylon 6), polyhexamethylene sebacamide (nylon 6/10), polytetramethylene adipamide (nylon 46), and the like. Is a copolymer of these polyamides,
Any polymer such as a blended polymer may be used. If the content of the other thermoplastic polyamide is less than 5 wt%, spherulites are likely to occur in melt spinning, and thus high toughness is difficult to achieve and a desired degree of irregularity tends to be difficult to obtain. Further, the Young's modulus of the yarn tends to be high, the covering state of the covering yarn tends to be insufficient, and the knitting surface of the product tends to deteriorate. On the other hand, the content of the other thermoplastic polyamide is 4
If it exceeds 0 wt%, it is difficult to obtain a product that also satisfies high toughness, and the texture tends to be too soft and the feeling of sagging tends to be strong. In addition, the dyeing fastness tends to decrease.

If necessary, the polyamide fiber of the present invention may contain a matting agent, a pigment, a light stabilizer, a heat stabilizer, an antioxidant, an antistatic agent, a dyeability improver or an adhesion improver. can do. The addition amount thereof can be selected within a range that does not impair the properties and spinnability of the polyamide fiber of the present invention. The polyamide fiber of the present invention has a W-shaped irregular cross-sectional shape as shown in FIG. 1 and has a flatness of 2.0 to 5.0. The flatness here means the length (L ₁ ) of the long side of the circumscribed rectangle of the single yarn cross section is W
A value (L ₁ / L ₀ ) divided by the thickness (L ₀ ) of the central portion of the letter.

The flatness must be 2.0 or more in order to obtain an appropriate sharpness, a delicate glossy feeling, and sufficient sweat absorption and quick drying performance. On the other hand, when the flatness exceeds 5.0, the difficulty of the manufacturing technique becomes high, the spinnability is deteriorated, and the toughness of the raw yarn is significantly reduced. Also, when it is made into a knitted fabric such as stockings, at the same time the gloss becomes stronger,
It is not preferable because the durability in use is poor. The flatness here is the average value of the values calculated from the individual fiber cross sections of the multifilament that is a fiber assembly.

The polyamide fiber of the present invention has the above formula (1).
The toughness calculated by is 35 to 50. When the toughness is less than 35, the stocking has low durability itself and is not practical. Furthermore, the strength of the knitted fabric is poor and it cannot be used for nude tows. The toughness is preferably 40 or more. If the toughness exceeds 50, the number of fluffs increases and the manufacturing becomes difficult.

The high toughness polyamide fiber of the present invention comprises:
For example, it is manufactured by the following method. When aiming at high toughness, a polymer having an increased molecular weight is generally used. The polyamide used in the present invention preferably has a molecular weight of 40 to 80 in relative viscosity (VR) of formic acid. When the VR is less than 40, not only the target toughness is difficult to be obtained, but also the degree of irregularity tends to be low. On the other hand, if the VR exceeds 80, it is advantageous for achieving high toughness and high degree of irregularity, but the terminal amino group concentration decreases, and in some cases, it may fall below the practicable range in terms of dyeability.

A known method may be used as the melt spinning method,
After spinning, the yarn may be wound once, and then the undrawn yarn may be drawn in a separate step, or a direct spinning and drawing method in which the yarn is continuously drawn after spinning. The single yarn fineness of the polyamide fiber is preferably 1 to 6 dtex. The covering yarn referred to in the present invention is generally made of polyurethane synthetic fiber, polyester elastic yarn, rubber yarn or the like as elastic yarn for the core yarn, and the core yarn (elastic yarn) is stretched, and the covering yarn is polyamide. It refers to a single wound fiber (single covering yarn), a double wound fiber (double covering yarn), or a core yarn and a covering yarn that are entangled by fluid jet processing with air. The core yarn is usually stretched about 3 times and coated, but it can be changed according to the physical properties of the core yarn and is not particularly limited. The covering yarn may be crimped yarn.

The stockings referred to in the present invention include pantyhose, thin socks, etc., and the covering yarn and / or polyamide fiber of the present invention may be used. Specifically, not only those covering only the covering yarn of the present invention and the polyamide fiber of the present invention, but also, for example, those in which the polyamide fiber of the present invention and the conventional covering yarn are knitted, the covering yarn of the present invention And a mixture of conventional polyamide fibers,
The thing knitted with the polyamide fiber of this invention and the conventional polyamide fiber etc. are also contained.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be further described below based on Examples. The definitions of various terms, measurement methods, evaluation methods, etc. are as follows. (1) Relative viscosity of formic acid 90 wt% Polymer concentration in aqueous formic acid solution 8.4 wt%
Dissolve so that the solution becomes 25 ° C using a viscous tube.
The relative viscosity was calculated with respect to the viscosity of the 90 wt% formic acid aqueous solution when measured by.

(2) A flatness profile cross-section photograph of the fiber was taken, and the length (L ₁ ) of the long side of the W-shaped circumscribing rectangle was divided by the thickness (L ₀ ) of the central portion of the W-shape from the photograph. The value (L ₁ / L ₀ ) was calculated. (3) Strength of raw yarn (A) and strength of covering yarn (B) After leaving the sample in a measuring room at a temperature of 20 ° C. and a relative humidity of 65% for a whole day and night, a sample length of 20 cm and an elongation rate of 20 cm / Tensile test was conducted in minutes to determine the tenacity (cN) of the raw yarn and the covering yarn.

(4) Covering State of Covering Yarn The covering state is visually checked with a magnifying glass by the following criteria:
Graded. ◎: Excellent, ○: Good, △: Slightly bad, ×: Bad (5) Breakthrough strength (plunger method) Breakthrough strength (N) of stockings is JIS-L-101
8 8.17.2 Measured by the B method (constant speed extension type method). However, the plunger speed is 300 mm / m
I went in.

(6) Water Absorption of Stocking (100% Stretching Bayrec Method) A test piece of size 25 mm × 100 mm was cut out from the stocking, fixed to a metal frame, and stretched 100% in the longitudinal direction. Adjust so that the lower end is horizontally immersed in water to a depth of 20 mm, and leave it as it is for 10 minutes. 1
The water absorption height (mm) after 0 minutes was taken as the water absorption of the stocking.

(7) With the quick-drying stockings of the stockings worn on the mannequin, 100 mm × 100 mm test pieces are cut from the thighs and the size is fixed. 0.1 g of water was added dropwise to the test piece, the mass of the test piece was measured after 10 minutes, the residual rate (%) of water was obtained, and the value (%) was taken as the quick-drying property. The smaller the value is, the less residual water is, which means that the sample is dry.

(8) Gloss of stocking The stocking was put on a panelist and evaluated by a sensory test on a scale of five. 5: Too glossy, 4: Slightly glossy 3: Moderately glossy, 2: Slightly dull, 1: Glossy (9) Texture of stockings Have panelists wear stockings for sensory inspection It was evaluated by 5 levels.

5: Too much sharpness, 4: Strong sharpness, 3: Moderate sharpness, 2: Little sharpness, 1: Slimy feel (10) Knitted surface of stocking Was visually evaluated using a magnifying glass on a scale of 4 according to the following criteria. ⊚: Excellent, ◯: Good, Δ: Slightly poor, ×: Poor [Examples 1 to 4, Comparative Examples 1 and 2] Nylon 66 polymer (formic acid relative viscosity: 45) and nylon 6 polymer (formic acid relative viscosity: 80) Using a polymer in which and were blended at a ratio of 80/20 (wt ratio), a winding speed of 4000 m /
While winding in minutes, 13 decitex / 5 filament polyamide fibers having W-shaped cross sections with different flatness as shown in Table 1 were produced. The flatness was adjusted mainly by the discharge shape of the spinneret, the spinning temperature, or the cooling conditions.

Next, each polyamide fiber obtained above was wound once while stretching a 17-decitex polyurethane elastic yarn three times to obtain a single covering yarn (twist number = 1800 T / m). Using only the obtained single covering yarn, knitting with a pantyhose knitting machine with 360 needles and a diameter of 3.4 inches (8.6 cm), dyeing, softening, and final setting to obtain stocking products (Zoki type) It was

[Comparative Examples 3 and 4] Polyamide fibers were produced in the same manner as in Example 1 except that the cross-sectional shape was round (comparative example 3) and trilobal (comparative example 4). Then, in the same manner as in Example 1, a single covering yarn and a stocking product were obtained. [Examples 5 and 6, Comparative Examples 5 and 6] As shown in Table 2, the nylon 66 polymer and nylon 6 used in Example 1 were 95/5, 60/40, 100/0, 30/70.
13 decitex / 5 having a W-shaped cross section with a flatness of about 3.0 while being wound at a winding speed of 4000 m / min using a polymer blended at a ratio (wt ratio) of
A filament of polyamide fiber was produced.

Then, using these, in the same manner as in Example 1, single covering yarn and stocking products were obtained. The above Examples, Comparative Examples, and measurement results and evaluation results are shown in Table 1 and Table 2 together.

[0033]

[Table 1]

[0034]

[Table 2]

As is apparent from Tables 1 and 2, when the flatness is within the range of the present invention (Examples 1 to 4), the covering yarn is covered, the breaking strength when used as stockings, the water absorption and the speed. The dry performance, appropriate luster, appropriate crispness, and beautifulness of the knitted surface were all satisfactory. When the tenacity of the raw yarn is A and the breakthrough tense of the stocking is C, the value of tenacity retention (C / A) and the tenacity retention (C / A) in the case of a round cross section are used as standards. C / A
Comparing the relative values of the above for each example, it can be seen that if the flatness is within the range of the present invention, the raw yarn tenacity is effectively exerted on the performance of the stocking. That is, in the case of Comparative Examples 1 and 2 and the trilobal modified cross section (Comparative Example 4), a large decrease in strength was observed, but in the case of the present invention, a large decrease in strength was not observed, and a circular cross section (Comparative Example Even in comparison with the case of 3), the use durability of the stocking was sufficiently excellent.

Further, as seen in Comparative Example 2, when the flatness is less than 2.0, which is outside the range of the present invention, only the groove depth of the recess in the W-shaped cross section is insufficient. No satisfactory water absorption / quick drying properties, moderate luster, sharpness, knitted surface of stockings, etc. were obtained. Further, as in Comparative Example 1, in the case of a modified cross-section yarn having a W-shaped cross-section having a flatness of more than 5.0, a glossy feeling becomes strong and only a low favorable sensitivity is obtained, and the breaking strength of the stocking is low. , It became inferior in use durability.

Further, as in Comparative Example 4, the trilobal modified cross-section yarn had sufficient performance as toughness, but the toughness is higher than that of the W-shaped cross-section of the present invention. The covering yarn did not contribute much to the strength of the covering yarn and the breaking strength of the stocking, which was insufficient. In addition, the trilobal cross-sectional shape was inferior in terms of sufficient water absorption and quick-drying performance, appropriate gloss and texture, and knitting surface.

In Comparative Examples 5 and 6, the toughness of the raw yarn is low,
Moreover, the breakthrough strength of the stockings is low and the durability of use is poor.

[0039]

EFFECTS OF THE INVENTION The polyamide fiber of the present invention has a W-shaped flat cross section having irregularities in its cross section, and therefore has excellent water absorption and
It has fast toughness, fine gloss, and moderate crispness, while having high toughness. In addition, the covering yarn using the polyamide fiber of the present invention shows a better covering state than the conventional one, and the stocking using the covering yarn shows a beautiful knitted surface state and is excellent in breakthrough strength. Therefore, as compared with the conventional stocking using the polyamide fiber having another modified cross-section, it is possible to give the wearing woman a comfortable feeling and satisfy both fashionability and use durability at the same time.

[Brief description of drawings]

FIG. 1 is a schematic view showing a cross-sectional shape of a single yarn of polyamide fiber of the present invention.

[Explanation of symbols]

L ₀ ... thickness of W-shaped central portion L ₁ ... length of long side of W-shaped circumscribed rectangle

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-6-57532 (JP, A) JP-A-11-269718 (JP, A) JP-A-11-279884 (JP, A) JP-A-60- 9942 (JP, A) International publication 99/047734 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) D01F 1/00-6/94 D02G 3/32, 3/38

Claims (3)

(57) [Claims] 1. A core yarn made of an elastic yarn , having a W-shaped cross-sectional shape, having a flatness of 2.0 to 5.0 and a toughness of 35 to 5.
A covering yarn coated with a polyamide fiber of 0 . 2. The covering yarn according to claim 1, wherein the polyamide fiber comprises 95 to 60 wt% of hexamethylene adipamide and 5 to 40 wt% of a thermoplastic polyamide other than hexamethylene adipamide . 3. The covering jar according to claim 1 or 2.
Stockings using the