JP4967422B2 - Polyamide multifilament for covering yarn and covering yarn and stockings using the same - Google Patents

Description

  The present invention relates to a polyamide filament for covering yarn effective for making a stocking having a glossy feeling like bare skin, and a covering yarn and stocking using the same.

  In stockings for women who place importance on transparency and fit, covering yarns in which elastic yarns are used as core yarns and polyamide filaments are used as sheath yarns are widely used. Polyamide filaments are widely used as materials for stockings because of their strength, abrasion resistance, dyeing properties of dyeing at normal pressure using acid dyes or reactive dyes, soft texture, and moisture absorption properties.

  As a required characteristic of stockings, it is required that the legs look more beautiful due to visual effects. For example, in Patent Document 1, excellent transparency and flatness are obtained by using a covering yarn composed of long fibers having a flat fiber cross-sectional shape with a flatness of 2.0 to 6.0. It has been proposed that the stockings have glossiness and durability. By making the cross-sectional shape a flat cross-section in a specific range, it is effective for uniformly covering elastic fibers, can improve wear durability, and the diameter of the covering yarn (refers to the elastic yarn and the entire covering yarn) Since the thickness of the knitted fabric is reduced, the gap of the knitted fabric is increased, which greatly contributes to improvement of transparency. However, as described later, although the intensity of the reflected light is reduced as compared with the round cross section, the reflected light on the side of the foot is still strong, and it is strongly felt that stockings are worn.

  On the other hand, Patent Document 2 proposes a multi-leaf cross-sectional shape of 3 to 8 having an irregularity of 1.03 to 1.15 as a covering yarn. However, when such a multi-leaf cross section is used as a covering yarn, irregular reflection occurs on the surface of the polyamide multifilament, so that the entire stocking looks whitish and transparency is lowered, which is not preferable.

  Further, Patent Document 3 proposes a special cross-sectional fiber having a “K” -shaped protrusion of katakana, and an application to a covering yarn is also presented. However, since protrusions are provided to increase sweat absorption, when used as a covering thread as in Patent Document 2, irregular reflection occurs on the surface of the polyamide filament, so that the entire stocking looks whitish and transparency is lowered. Therefore, it was not preferable.

Further, Patent Document 4 proposes an “W” -shaped cross section of the alphabet, and also proposes application to stockings as a covering thread. It is said that the water-absorbing and quick-drying and fine gloss and moderate sharpness due to the W-shaped groove structure and soft texture due to flattening are obtained. However, because the W type is not a line-symmetric structure with respect to the axis in the flat direction, it has the problem that the bending rigidity varies depending on the bending direction. Sex worsens. Further, since there are many irregularities as in Patent Documents 2 and 3, when used as a covering yarn, irregular reflection occurs on the surface of the polyamide filament, so that the entire stocking looks whitish and transparency may be lowered.
JP 7-157902 A (paragraph numbers [0001] to [0012]) JP-A-2-80635 (first page, lower right column, second line to second page, upper right column, eighth line) JP-A-6-81207 (paragraph numbers [0002] to [0011]) JP 2002-146626 A (paragraph numbers [0002] to [0012])

  When using stockings, polyamide multifilament for covering yarn that improves transparency at the front and suppresses reflected light from the side and produces glossy feeling close to the skin without being aware of wearing stockings. It is an object of the present invention to provide a covering yarn and stockings.

In order to solve this problem, the present invention employs the following configuration.
(1) When the total fineness is 7 to 15 dtex and the cross-sectional shape is the long side length L and the short side length S of the rectangle circumscribing the cross section, the flatness = L / S is 1.5 to 4.0 , S / BS, which is the ratio of the short side length S to the recess bottom length BS , has a flat cross section of 1.05 to 2.50 , and is symmetrical with respect to the long axis of the flat cross section A polyamide multifilament for covering yarn, characterized in that it has one or two recesses on its long axis surface, and has no inflection points at both ends of a flat cross section other than the recesses.
(2) elastic as multifilament for covering yarn on a core yarn consisting of fibers (1) Symbol placement covering yarn using the covering yarn for polyamide multifilament.
( 3 ) A stocking characterized in that the covering yarn according to ( 2 ) is used for at least one part of a leg part.

  In the present invention, when the yarn adopting the above configuration is used as a covering yarn and applied to a stocking, the front surface of the curved surface of the foot is improved in view of the observer and the reflected light on the side surface is suppressed. It is not conscious of wearing, and glossiness like bare feet is obtained. Moreover, since it has a flat cross-sectional structure, it is excellent in coverage and can be a product with high friction durability required as a stocking.

  As a configuration of the present invention, when a long side length L and a short side length S of a rectangle circumscribing the cross section are taken as a cross sectional shape, the flat cross section having a flatness = L / S of 1.5 to 4.0 And has a shape that is line symmetric with respect to the major axis of the flat cross section, has one or two concave portions on the major axis surface, and has no inflection points at both ends of the flat cross section constituting other than the concave portions. Polyamide multifilament for covering yarn.

  That is, the above configuration is adopted in order to obtain a glossy feeling like a bare foot that does not make you aware of wearing stockings by improving the transparency in front of the observer on the curved surface of the foot and suppressing the reflected light on the side. ing. Specifically, the shape when two round cross-section single yarns are arranged has, for example, one concave portion on the long axis surface as shown in FIGS. 1 and 2, and the three round cross-section single yarns are in a straight line. For example, as shown in FIG. 3, the shape of the side by side has two concave portions on the long axis surface.

  When the polyamide multifilament for covering yarn of the present invention has a cross-sectional shape cut perpendicularly to the fiber axis and has a long side length L and a short side length S circumscribing the cross section, the flatness = L / S has a flat cross section of 1.5 to 4.0. By setting it as such a flat cross section, the bending stress of a flat cross section short-axis direction falls, and when it winds around an elastic yarn, coverage is improved. As the covering property is improved, the diameter of the covering yarn is reduced as described in the background art, and the gap of the knitted fabric is increased, which greatly contributes to the improvement of transparency. That is, transparency is improved when viewed from the front of the leg. Furthermore, by winding elastic yarns that are inferior in strength and wear resistance with polyamide multifilaments with good covering properties, it is possible to improve wear resistance of stockings by suppressing the breakage of the elastic yarn being worn, so-called core breakage. .

  Here, when the flatness = L / S is less than 1.5, the effect of the flat cross section cannot be exhibited sufficiently, which is not preferable. On the other hand, if it exceeds 4.0, the flatness is high, so that the effect of the concave portion of the long axis surface is not sufficiently exhibited, and the intended effect of the present invention is hardly obtained, which is not preferable.

  Moreover, the polyamide multifilament for covering yarn of the present invention has a shape that is line-symmetric with respect to the major axis of the flat cross section as a cross-sectional shape. This is because, when wound around the elastic yarn, the bending stress is equal regardless of which surface the single yarn is wound on either side of the long axis of the flat cross section by making it a line symmetrical shape with respect to the long axis of the flat cross section Therefore, stable covering is performed. On the other hand, a shape that is asymmetric with respect to the long axis of the flat cross section is not preferable because it tends to reverse to a surface with a lower bending stress during covering, and the covering is not stable. Here, the line symmetry does not need to be strictly line symmetry, and some shape variation generated during melt spinning is allowed. In addition, it is not line-symmetrical, but the shape that is point-symmetric about the center of gravity (the shape that overlaps even if it is rotated 180 ° around a certain point, for example, N-shaped or S-shaped) is a form in which light is diffusely reflected. It is not preferable. When spinning a flat section, if the cooling air is applied perpendicularly to the long axis of the flat section, the flat section may be bent in a crescent shape and have a slightly asymmetric shape with respect to the long axis. Since the angle formed by the line connecting the center of the cross section and both ends of the long axis of the flat cross section is not substantially affected up to 160 degrees, it is within the scope of the present invention.

  Furthermore, the polyamide multifilament for covering yarn of the present invention has one or two concave portions on the long axis surface of the flat cross section as a cross-sectional shape. By providing one or two recesses on the long axis surface, when wearing stockings, luster such as bare feet that does not make the viewer aware of wearing stockings by suppressing the reflected light on the side of the foot as seen from the observer A feeling is obtained. In the present invention, the long axis of the flat cross section means a central axis parallel to the long side of the circumscribed rectangle, and the long axis surface means a portion facing the long side of the circumscribed rectangle. . For example, in FIG. 1, the major axis surface means two parts facing the long side of the circumscribed rectangle (the two parts on the upper long side and the lower long side), A portion facing the lower long side of the circumscribed rectangle is shown surrounded by an ellipse LP. Furthermore, having one concave portion on the long axis surface means that when the long axis surface of the upper surface is traced from left to right, it becomes a negative inclination from the long side of the circumscribed rectangle and the horizontal surface, and the inclination is once zero. After that, it means a positive inclination until it returns to the horizontal, and two recesses mean that there are two.

  FIG. 12 shows the measurement results of the angle dependence of the knitted fabric reflected light intensity of stockings using a polyamide multifilament for covering yarn having a round cross section. When the angle of the incident light with respect to the knitted fabric is 45 °, a peak of reflected light intensity is seen at an angle of 45 °, which is regular reflection, and around 90 ° horizontal to the surface of the knitted fabric. Of these, the 45 ° peak is regular reflection, and therefore, when a stocking knitted fabric is used, the peak inevitably appears even if the peak is large or small. That is, when assuming the case where a stocking is worn, light hardly hits from one direction and hits a foot having a cylindrical curved surface from various directions. Since the reflected light from the front of the foot is small when viewed from the observer, the foot can be seen relatively transparently. On the other hand, since a peak of reflected light intensity is observed near 90 ° parallel to the surface of the knitted fabric, it means that strong reflected light is generated on the side of the foot as viewed from the observer. It shows that it looks whitish by strong reflected light from both sides. The reflected light from the side makes the observer strongly aware of wearing stockings, which is one of the reasons why they do not look like bare feet. This appears remarkably in colors close to skin color such as beige and brown, and on the contrary, it is relatively small in dark colors such as black and dark blue with relatively little reflected light.

  In addition, a shadow effect is known as an effect in which stockings make a leg look beautiful. That is, when observing the foot wearing a stocking, the density of the knitted fabric is low (the gap is small) on the front side of the foot, while the density of the knitted fabric is high (the gap is small) toward the side. It looks darker and the effect of shading makes the feet appear thinner than bare feet. This is the reason why the shadow effect of the conventional product is not as good as that of dark colors such as black.

  FIG. 13 shows the measurement results of the angle dependence of the knitted fabric reflected light intensity of the stockings using the polyamide multifilament for oval covering yarn. When compared with the circular cross section, the reflected light is greatly reduced from the incident light direction to the normal direction (0 °) with respect to the knitted ground, and as described above, coupled with the effect of increasing the gap of the knitted fabric, Transparency is improved. However, a peak of reflected light intensity is observed at an angle of 45 °, which is regular reflection, and around 90 °, which is horizontal with the surface of the knitted fabric, both of which are higher than in the case of a round cross section. Therefore, both sides of the foot appear whitish due to the reflected light.

  FIG. 14 shows the measurement results of the angle dependence of the knitted fabric reflected light intensity of stockings using Y-shaped polyamide multifilament for covering yarn. Compared with the round cross section, the peak from the incident light direction (-45 °) to specular reflection (45 °) is high as a whole, while the peak of specular reflection (45 °) is low, and the surface of the knitted fabric A characteristic is that no peak of reflected light intensity is observed in the vicinity of horizontal 90 °. Since there are three protrusions in the cross section, the protrusions are arranged in a random direction on the wound covering. Therefore, it is estimated that the light is reflected in various directions. As a stocking, the entire foot becomes whitish, so it cannot be used as a stocking that aims for a transparent feeling.

  On the other hand, FIG. 11 shows the angle dependence measurement result of the knitted fabric reflected light intensity of the stockings using the polyamide multifilament for covering yarn of the present invention having the cross-sectional shape of FIG. From the incident light direction (-45 °) to the specular reflection direction (45 °), the cross-sectional shape is the same as that of the oval type, but no peak of reflected light intensity is observed in the vicinity of 90 ° parallel to the surface of the knitted fabric. It is a feature.

  Therefore, as described in the oval type, the transparency when viewed from the front of the foot is increased, and the reflected light on the side of the foot is suppressed, so that it looks like a bare foot and the shadow effect when wearing stockings is effective It works, and the legs are thin and look beautiful.

  The reason why the peak of reflected light intensity is not observed near 90 ° parallel to the surface of the knitted fabric is that the surface of the knitted fabric has one or two recesses on the long axis surface of the flat cross section. It is presumed that this is because light reflection is suppressed in the horizontal direction, and the cross-sectional shape of the present invention can improve the transparency of the stocking and the shadow effect.

  If there are three or more recesses on the long axis surface of the flat cross section, the flatness becomes too high and the strength decreases, and the discharge hole shape of the die becomes complicated, so that the discharge hole area becomes larger. It is easy to lead to a decrease in operability.

  Furthermore, the polyamide multifilament for covering yarn of the present invention does not have an inflection point at both ends of the flat cross section constituting other than the recess. Here, the inflection point is the boundary where the unevenness of the function changes, and the inflection point other than the recess is the vertex of the convex part that is in contact with the long side of the circumscribed rectangle as described in the cross section of FIG. Points to the inflection point that exists from the short side of the circumscribed rectangle to the apex of the convex part. This is because when a convex portion is formed at the end of the long axis of the flat cross section, irregular reflection occurs in the same manner as the multi-leaf cross section, which decreases the transparency of the stockings, which is not preferable. Specifically, since the flat cross section of the present invention has one or two concave portions on the long axis surface, it has a vertex on the long axis surface. Transparency of stockings due to surface irregular reflection by not having an inflection point from the vertex at the end in the major axis direction to the next vertex on the opposite surface through the end of the flat cross section constituting the major axis in the major axis direction Can be suppressed. As an example of a preferable aspect, a form in which two or three round cross-sections are arranged on a straight line, or a form in which one or two concave portions are provided on a long side of a rectangle can be given.

  Moreover, when using it for the leg part of a stocking, it is preferable that a total fineness shall be 7-15 dtex, and it is preferable to set it as 2-8 filaments. This is because it is preferable to design the total fineness and the number of filaments within the above ranges from the practical durability as stockings in order to develop transparency and natural surface reflected light characteristics when used as stockings. When the total fineness is less than 7 decitex, the bursting strength and friction durability as stockings are not sufficient. On the other hand, when it exceeds 15 decitex, the transparency is lowered, so that the characteristics aimed by the present invention are not sufficiently exhibited. On the other hand, monofilaments do not have sufficient coverage as the number of filaments, so it is difficult to maintain friction durability. For 9 filaments or more, the transparency of stockings tends to decrease due to an increase in surface area due to an increase in the number of filaments. Above all, by setting the single yarn fineness to 1.3 to 2.5 dtex, it becomes possible to express transparency and natural surface reflected light characteristics, which is more preferable.

  Moreover, as a preferable aspect of the present invention, S / BS = 1.05 to 2.5, which is a ratio of the short side length S to the recess bottom portion length BS. That is, by defining the shape of the recess, the above-described surface reflection characteristics can be sufficiently exhibited. That is, when the S / BS is less than 1.05, it becomes difficult to express the difference from the oblate flat cross section, and conversely, when the S / BS exceeds 2.5, the irregular reflection is dominant like the projection and the stocking It tends to cause a decrease in transparency. Among these, S / BS of 1.05 to 1.5 is preferable because it allows more natural surface reflection characteristics to be expressed and suppresses a decrease in strength due to the flat cross section. Here, BS means the distance between two lines parallel to the long side of the circumscribed rectangle of the cross section and inscribed in the bottom of the recess.

  The polyamide filament for covering yarn of the present invention is preferably used as a flat yarn. This means a long fiber that has not been crimped, such as false twisting. If false twisted yarn is used, the cross-section becomes irregular, and further, irregularities occur in the fiber axis direction, resulting in a decrease in transparency.

  In the present invention, the elongation of the flat yarn is preferably 20 to 60%. This is because, by setting the elongation to the above range, the strength can be designed to be higher, and for example, the total fineness can be made finer and the transparency can be further improved. Among these, by setting the elongation to a range of 30 to 50%, both strength and high-order passability can be improved.

Since the polyamide filament for covering yarn of the present invention has a flat cross-sectional shape, the package foam (bulge, saddle) is also good, and it is very tough against yarn dropping. A good package foam provides unwinding stability from the package and contributes to high-order passage and product quality stability.
The polyamide as used in the present invention is a high molecular weight product in which a so-called hydrocarbon group is connected to the main chain through an amide bond, and is preferably a polycaproate mainly from the viewpoint of excellent dyeability, fastness to washing and mechanical properties. An amide or a polyamide such as polyhexamethylene adipamide is preferred. The term “mainly” as used herein refers to 80 mol% as ε-caproamide units in all amide units constituting polycaproamide and as hexamethylene adipamide units in all amide units constituting polyhexamethylene adipamide. It is said above, More preferably, it is 90 mol% or more. Other components are not particularly limited, but in the case of polycaproamide, hexamethylene adipamide units, in the case of polyhexamethylene adipamide, in addition to caproamide units, for example, polydodecanoamide, polyhexaamide. Aminocarboxylic acid, which is a monomer constituting methylene azeramide, polyhexamethylene sebacamide, polyhexamethylene dodecanoamide, polymetaxylylene adipamide, polyhexamethylene terephthalamide, polyhexamethylene isophthalamide, Units such as dicarboxylic acid and diamine may be mentioned.

  The degree of polymerization of the polyamide referred to in the present invention may be appropriately selected in consideration of the necessary yarn strength, initial tensile resistance, etc., but is preferably in the range of 2.0 to 3.3 with 98% sulfuric acid relative viscosity.

  Furthermore, a light stabilizer, a heat stabilizer, an antioxidant, an antistatic agent, a terminal group modifier, a dyeability improver, and the like may be added as necessary. In addition, inorganic particles and organic functional agents can be added to impart ultraviolet absorption, contact cooling, antibacterial properties, and the like. However, addition of inorganic particles exceeding 1 μm is not preferable because it causes a decrease in transparency, and the addition of inorganic particles including white pigments is more preferably less than 0.3%.

  The polyamide filament for covering yarn as described above can be produced, for example, as follows, but is not limited to this.

  As a melt spinning method, for example, a die having round holes at both ends of a slit can be used as a flat cross section having one concave portion on the major axis as an example of a die to be used. In this case, as a ratio of the slit width H of the discharge hole, the discharge hole length N in the slit direction, and the diameter D of the round hole, when the slit width H is 1, the discharge hole length N in the slit direction is 4-20. The diameter D of the round hole is 1.5-4. Similarly, a flat cross section having two recesses can be obtained by using a die having round holes at both ends and the center of the slit. The molten polymer is discharged from the die, and after cooling and refueling, it is taken up at about 1500 to 4000 m / min (first godet roller) and stretched about 1.0 to 3.0 times with the next second godie roller. After performing, it can wind up at 3000 m / min or more. At this time, the aim is to appropriately design the draw ratio between the first and second godet rollers (the higher the draw ratio, the lower the elongation) and the take-up speed (lower the take-up speed). It is possible to obtain the strength and elongation. In addition, it is preferable to perform the heat treatment by using the second godie roll as a heating roll at 150 to 170 ° C. There is no problem with each godie roll, either a Nelson roller, a drive roller with a driven separation roller, or a one-sided roller. In order to suppress slippage between the roller and the filament, it is preferable to smooth the surface state of the roller, or to make the second godet groove with a groove to improve yarn separation, or to make it satin.

  The oil agent is applied to the multifilament by roller oiling, guide oiling, etc., and the amount of active ingredient adhering during winding is preferably about 0.4 to 1.5% by weight per multifilament weight. The application of the oil agent is not a problem even if it is performed once or a plurality of times during the spinning process. When performing by dividing into multiple times, it is preferable to apply an oil agent having a high active ingredient amount after applying an oil agent having a low active ingredient amount.

  The type of oil agent is not particularly limited, and fatty acid esters, nonionic emulsifiers, antistatic agents and the like can be mixed and used.

  The polyamide multifilament for covering yarn of the present invention is used when an elastic yarn is used as a core yarn and wound as a sheath yarn.

  As elastic yarn, polyurethane elastic fiber, polyamide elastomer elastic fiber, polyester elastomer elastic fiber, natural rubber fiber, synthetic rubber fiber, butadiene fiber, etc. are used. Elastic properties, heat setting property, durability, etc. May be selected as appropriate. Among these, polyurethane-based elastic fibers and polyamide-based elastomer elastic fibers are preferable from the above characteristics. The thickness of the elastic yarn varies depending on the use of the socks and the setting of the tightening pressure, but in general, it may be about 8 to 40 dtex in order to achieve both durability and transparency. Among these, 14 to 25 dtex is preferable. If it is less than 8 dtex, the yarn strength is insufficient, so that troubles such as core yarn breakage are liable to occur during covering and knitting, and the stretchability and durability as socks are likely to be insufficient. On the other hand, if it exceeds 40 dtex, the tightening force becomes too strong and the coarseness becomes strong, which is preferable, and the transparency tends to decrease.

  The covering twist number may be designed in consideration of the fineness, shrinkage, product texture, transparency, and durability of the coated yarn. Increasing the number of covering twists reduces the apparent thickness, which tends to improve transparency, but if it is increased too much, it is preferable because the elastic yarn is tightened too much and the durability decreases or the productivity of the covering process decreases. Absent. On the other hand, if the covering twist number is too low, the covering property is lowered and the durability and transparency are lowered. Therefore, for example, when single-covering 11 decitex coated yarn, it is preferable to design 1800-2400 T / m as a guide. Furthermore, when double-covering, 0.7 to 0.9 times the number of lower twists should be set as a guideline, and the twisting direction can be set either in the same direction or in the opposite direction. However, it is preferable to cover in the reverse direction in order to suppress the torque. Moreover, what is necessary is just to design according to the landing pressure which aims at draft magnification, for example, it is preferable to set to 2.5 to 3.5 times.

  In addition, what is necessary is just to implement a usual covering process when manufacturing a covering thread | yarn. For example, the processing described in the encyclopedia of fibers (Maruzen Co., Ltd., issued on March 25, 2002, p439) may be performed. That is, for example, the elastic yarn is pulled out at a constant speed, and the coated yarn previously wound around the H bobbin is wound around the elastic yarn at a constant covering twist number with a constant draft applied between the two rollers. The covering yarn is wound around cheese.

  The polyamide filament for covering yarn of the present invention is preferably used for stockings. Among them, as a stocking, it is preferably used for a leg part by making use of a glossiness excellent in transparency, bare foot feeling and shadow effect. Here, stockings include stockings products represented by pantyhose, long stockings, and short stockings, and the leg portion refers to a range from a garter portion to a toe in the case of pantyhose, for example.

  Further, a normal sock knitting machine can be used as a knitting machine for stockings, and there is no limitation. A normal method of knitting by supplying a covering yarn of the present invention using a knitting machine having two or four necks. You can organize with. In the case of a single covering yarn, a method of alternately knitting a single covering yarn of S direction covering and a single covering yarn of Z direction covering is preferable. Other examples include single covering yarn and raw yarn knitting, double covering yarn and raw yarn knitting. Furthermore, the number of needles of the knitting machine is generally 360 to 474. The smaller the number of needles, the higher the transparency, but the lower the bursting strength. The larger the number of needles, the higher the bursting strength. Sex tends to decline. Therefore, it can be selected in accordance with the fineness of the coated yarn and elastic yarn to be used, the intended durability, and transparency. As an example, it is preferable to set the number of needles to 360 to 400 with a coated yarn of 13 dtex, and similarly to 400 to 440 with an hour of 11 dtex and 440 to 474 at the time of 8 dtex.

  Furthermore, dyeing after knitting, subsequent post-processing, and final set conditions may be performed according to known methods, and the use of acid dyes and reactive dyes as dyes and of course colors are not limited.

  The covering yarn is excellent in color developability, covering property and touch, and is preferably used for circular knitting for skin wear. When used as an underwear, a part or all of the circular knitted supply yarn is used as a covering yarn, so that it is possible to obtain an underwear having a thin texture while having a natural glossiness.

  Hereinafter, the present invention will be described more specifically with reference to examples.

  In addition, each measured value in an Example and a comparative example was obtained with the following method.

A. Cross-sectional shape Cut a thin slice in the cross-sectional direction at an arbitrary position of the fiber used for the coated yarn, photograph 100 cross-sections of the fiber cross-section with a transmission microscope as the number of single yarns, and print out at a magnification of 1000 times (SCT manufactured by Mitsubishi Electric Corporation) -P66), then using a scanner (Epson GT-5500WINS) to capture (black and white photo, 400 dpi), magnified 1500 times on the display, and using image processing software (WINROOF), the long axis length The ratio of L to the short axis length S = L / S and the ratio of the short side length S to the recess bottom length BS = S / BS, and the number average of the values obtained from 100 Flatness = L / S and S / BS were determined from the values.

B. Measurement of angle dependency of reflected light intensity of knitted fabric GONIO PHOTOMETER (GP-200 manufactured by Murakami Color Research Laboratory) was used as a measuring device. The measurement conditions are as follows: light beam stop = 3.0, light receiving stop = 2.0, incident angle = 45 °, tilt angle = 0 °, reflection angle = −45 ° to 90 °, SENSITIVITY = 940, and attached standard white Using a plate (STD4010A), HIGH VOLT = 628 was set so that the maximum glossiness was 100. Moreover, the positional relationship regarding the sample position at the time of a measurement, incident light direction, and the measurement angle of reflected light was shown in FIG.

  The stocking product used for measurement is subjected to a scouring process (90 ° C x 30 min) to remove the oil and dirt to remove the influence of the color of the dyeing. Only a heat treatment is performed in the state of a white fabric without applying an agent and a softening agent, and a final set (steam set 110 ° C. × 60 sec) is used.

Wear a stocking product in a foot shape, align the garter at a position of 65 cm from the heel to the thigh, and wear it with an embroidery frame with a diameter of 10 cm, centering on a position of 57.5 cm from the heel to the thigh The state extension state was fixed. Then, the stocking product at the center of the embroidery frame was fixed to a fixed frame having inner windows of 3 cm in the vertical direction and 2 cm in the horizontal direction when worn. Thus, the angle dependency of the reflected light intensity is measured in the same state as the wearing state of the thigh. The fixed frame was installed in the measuring device with the front surface of the stocking product (the side not in contact with the skin) as the measurement surface. Note that nothing is placed on the back of the knitted fabric in the light receiving portion.
The foot shape was created to resemble a human foot, the length from the toes to the heel is 23.5 cm, the circumference of the arch part 13.5 cm away from the toes to the sole of the foot is 22.5 cm, The circumference of the ankle 8cm from the heel to the thigh is 22cm, the circumference of the calf 25cm from the heel to the thigh is 34.5cm, and the circumference of the back of the knee 43cm from the heel to the thigh 37 cm, the circumference of the thigh of 50 cm from the heel to the thigh is 39.5 cm, and the circumference of the thigh of 60 cm from the heel to the thigh is 48 cm.

C. 98% sulfuric acid relative viscosity (ηr)
(A) A sample is weighed and dissolved in 98% by weight concentrated sulfuric acid so that the sample concentration (C) is 1 g / 100 ml.
(B) The solution (a) is measured for the number of seconds (T1) dropped at 25 ° C. using an Ostwald viscometer.
(C) The falling seconds (T2) at 25 ° C. of 98 wt% concentrated sulfuric acid in which the sample is not dissolved are measured in the same manner as in the item (2).
(D) The 98% sulfuric acid relative viscosity (ηr) of the sample is calculated by the following equation. The measurement temperature is 25 ° C.
(Ηr) = (T1 / T2) + {1.891 × (1.000−C)}.

D. Measurement of elongation Measured according to JIS L1013-1992 7.5 tensile strength and elongation. As the test conditions, the type of the tester was a constant speed tension type with a grip interval of 50 cm.

Example 1
A polycaproamide (hereinafter nylon 6) chip having a 98% sulfuric acid relative viscosity of 2.7 and not containing inorganic particles such as titanium oxide is melted at 275 ° C. (spinning temperature is 270 ° C.), and discharges have round holes at both ends of the slit. Slit that becomes a hole (when the slit width H of the discharge hole is 1, as shown in FIG. 15, the discharge hole length N / H = 4.4 in the slit direction, the diameter D / H = 2.0 of the round hole) It is discharged from a spinneret having a discharge hole in the shape, and after applying oil agent (including fatty acid ester, nonionic emulsifier and antistatic agent as oil agent active ingredients) by cooling and guide oiling, it is entangled at a confounding pressure of 0.2 MPa The first godet roll is then taken up and taken up. The second godie roll is stretched between the first and second godie rolls and heated by the second godie roll without being wound up. After setting With Les Engineering Co., Ltd. TW-716 winder wound up speed at 11 decitex 5 The filament filaments winding speed 4000 m / min at 3kg per package winding tension 1.3CN. In the operability evaluation using 100 kg of raw material, the yarn was not broken and the fluctuation of the winding tension was small and stable.

  The cross-sectional shape is a cross-sectional shape in which one concave portion is present on the long axis surface, flatness = L / S is 1.8, S / BS = 1.07, and two circular cross-sections are arranged in an overlapping manner ( Figure 1). The elongation was 44%. Further, after extracting the oil with trichlorethylene, it was confirmed by evaporating the trichlorethylene at 100 ° C. and measuring the weight of the residue, and the oil content was 1.0% by weight. The wound package was free of yarn dropping, had a good foam, smooth unwinding, and was an excellent package.

Example 2
Unless otherwise specified, spinning was carried out in the same manner as in Example 1 as follows. The shape of the discharge hole is a discharge hole having round holes at both ends and the center of the slit (when the slit width H of the discharge hole is 1, the discharge hole length N / H = 10.6 in the slit direction, the round holes at both ends Diameter D / H = 2.5, diameter D / H = 2.0 in the center of the circular hole), and the first and second so that the elongation is 44% and the winding tension is 1.3 cN. Adjusted the speed of 2 Godey rolls In the operability evaluation using 100 kg of raw material, the yarn was not broken and the fluctuation of the winding tension was small and stable.

  The cross-sectional shape is a cross-sectional shape in which two concave portions are present on the major axis surface, flatness = L / S is 3.0, S / BS = 1.20, and three circular cross-sections are arranged in an overlapping manner ( Fig. 4). After extracting the oil agent with trichlorethylene, it was confirmed by evaporating trichlorethylene at 100 ° C. and measuring the weight of the residue. The oil content was 1.0% by weight. The wound package was free of yarn dropping, had a good foam, smooth unwinding, and was an excellent package.

Example 3
Unless otherwise specified, spinning was carried out in the same manner as in Example 1 as follows. As for the shape of the discharge hole, a total of four short slits are arranged at both ends of the long central slit at an angle of 135 ° with respect to the central slit (slit width 0.1 mm, slit length 0. Using 2 discharge holes with a slit width of 0.07 mm and slit length of 0.1 mm at a 135 ° angle with respect to the central slit at both ends, and the elongation becomes 44%. The speeds of the first and second godet rolls were adjusted so that the tension was 1.3 cN. In the operability evaluation using 100 kg of raw material, the yarn was not broken and the fluctuation of the winding tension was small and stable.

  The cross-sectional shape is a cross-sectional shape in which one concave portion exists on the long axis surface, flatness = L / S is 2.0, S / BS = 1.20, and two rectangles are arranged while being connected by the concave portion. (Fig. 5). After extracting the oil agent with trichlorethylene, it was confirmed by evaporating trichlorethylene at 100 ° C. and measuring the weight of the residue. The oil content was 1.0% by weight. The wound package was free of yarn dropping, had a good foam, smooth unwinding, and was an excellent package.

Example 4
Unless otherwise specified, spinning was carried out in the same manner as in Example 1 as follows. As the shape of the discharge hole, a discharge hole having round holes at both ends of the slit (when the slit width H of the discharge hole is 1, as shown in FIG. 15, the discharge hole length N / H = 4.1 in the slit direction, The diameter of the round hole D / H = 2.2) was used, and the speeds of the first and second godet rolls were adjusted so that the elongation was 44% and the winding tension was 1.3 cN. In the operability evaluation using 100 kg of raw material, the yarn was not broken and the fluctuation of the winding tension was small and stable.

  The cross-sectional shape has one concave portion on the long axis surface, flatness = L / S is 1.6, S / BS = 1.20, and two circular cross-sections are arranged side by side as shown in FIG. It had a cross-sectional shape. After extracting the oil agent with trichlorethylene, it was confirmed by evaporating trichlorethylene at 100 ° C. and measuring the weight of the residue. The oil content was 1.0% by weight. The wound package was free of yarn dropping, had a good foam, smooth unwinding, and was an excellent package.

Example 5
Unless otherwise specified, spinning was carried out in the same manner as in Example 1 as follows. As the discharge hole shape, a discharge hole having round holes at both ends of the slit (when the slit width H of the discharge hole is 1 as shown in FIG. 15, the discharge hole length N / H = 18.5 in the slit direction, The diameter of the round hole D / H = 2.1) was used, and the speeds of the first and second godet rolls were adjusted so that the elongation was 44% and the winding tension was 1.3 cN. In the operability evaluation using 100 kg of raw material, the yarn was not broken and the fluctuation of the winding tension was small and stable.

  The cross-sectional shape had one concave portion on the long axis surface, flatness = L / S = 3.8, S / BS = 1.20, and was a cross-sectional shape like a dock bone. After extracting the oil agent with trichlorethylene, it was confirmed by evaporating trichlorethylene at 100 ° C. and measuring the weight of the residue. The oil content was 1.0% by weight. The wound package was free of yarn dropping, had a good foam, smooth unwinding, and was an excellent package.

Example 6
Unless otherwise specified, spinning was carried out in the same manner as in Example 1 as follows. As the shape of the discharge hole, a discharge hole having round holes at both ends of the slit (when the slit width H of the discharge hole is 1, as shown in FIG. 15, the discharge hole length N / H = 6.1 in the slit direction, The diameter of the round hole D / H = 2.0) was used, and the speeds of the first and second godet rolls were adjusted so that the elongation was 44% and the winding tension was 1.3 cN. In the operability evaluation using 100 kg of raw material, the yarn was not broken and the fluctuation of the winding tension was small and stable.

  The cross-sectional shape has one recess on the long axis surface, flatness = L / S is 2.0, S / BS = 1.13, and two round cross-sections are arranged side by side as shown in FIG. It had a cross-sectional shape. After extracting the oil agent with trichlorethylene, it was confirmed by evaporating trichlorethylene at 100 ° C. and measuring the weight of the residue. The oil content was 1.0% by weight. The wound package was free of yarn dropping, had a good foam, smooth unwinding, and was an excellent package.

Comparative Example 7
Unless otherwise specified, spinning was carried out in the same manner as in Example 1 as follows. As the shape of the discharge hole, a discharge hole having round holes at both ends of the slit (when the slit width H of the discharge hole is 1, as shown in FIG. 15, the discharge hole length N / H = 6.1 in the slit direction, The diameter of the round hole D / H = 3.0) was used, and the speeds of the first and second godet rolls were adjusted so that the elongation was 44% and the winding tension was 1.3 cN. In the operability evaluation using 100 kg of raw material, the yarn was not broken and the fluctuation of the winding tension was small and stable.

  The cross-sectional shape has one concave portion on the long axis surface, flatness = L / S is 2.0, S / BS = 2.80, and two circular cross-sections are arranged side by side as shown in FIG. It had a cross-sectional shape. After extracting the oil agent with trichlorethylene, it was confirmed by evaporating trichlorethylene at 100 ° C. and measuring the weight of the residue. The oil content was 1.0% by weight. The wound package was free of yarn dropping, had a good foam, smooth unwinding, and was an excellent package.

Example 8
Unless otherwise specified, spinning was carried out in the same manner as in Example 1 as follows. As the shape of the discharge hole, a discharge hole having round holes at both ends of the slit (when the slit width H of the discharge hole is 1, as shown in FIG. 15, the discharge hole length N / H = 6.1 in the slit direction, Using the diameter D / H of the round hole D / H = 2.3), the discharge amount of the polymer and the number of discharge holes are changed, the elongation becomes 44%, and the winding tension becomes 1.3 cN. The speed of the godet roll was adjusted and a 9 dtex 3-filament polyamide filament was wound up. In the operability evaluation using 100 kg of raw material, the yarn was not broken and the fluctuation of the winding tension was small and stable.

  The cross-sectional shape has one concave portion on the long axis surface, flatness = L / S is 2.0, S / BS = 1.20, and two circular cross-sections are overlapped and arranged as shown in FIG. It had a cross-sectional shape. After extracting the oil agent with trichlorethylene, it was confirmed by evaporating trichlorethylene at 100 ° C. and measuring the weight of the residue. The oil content was 1.0% by weight. The wound package was free of yarn dropping, had a good foam, smooth unwinding, and was an excellent package.

Example 9
Unless otherwise specified, spinning was carried out in the same manner as in Example 1 as follows. As the shape of the discharge hole, a discharge hole having round holes at both ends of the slit (when the slit width H of the discharge hole is 1, as shown in FIG. 15, the discharge hole length N / H = 7.8 in the slit direction, Using the diameter D / H of the round hole D / H = 2.3), the discharge amount of the polymer and the number of discharge holes are changed, the elongation becomes 44%, and the winding tension becomes 1.3 cN. The speed of the godet roll was adjusted to take up 13 decitex 7 filament polyamide filaments. In the operability evaluation using 100 kg of raw material, the yarn was not broken and the fluctuation of the winding tension was small and stable.

  The cross-sectional shape has one recess on the long axis surface, flatness = L / S = 2.2, S / BS = 1.36, and two round cross-sections are arranged side by side as shown in FIG. It had a cross-sectional shape. After extracting the oil agent with trichlorethylene, it was confirmed by evaporating trichlorethylene at 100 ° C. and measuring the weight of the residue. The oil content was 1.0% by weight. The wound package was free of yarn dropping, had a good foam, smooth unwinding, and was an excellent package.

Comparative Example 1
Unless otherwise specified, spinning was carried out in the same manner as in Example 1 as follows. As the discharge hole shape, using a discharge hole having a 0.2 mm round hole, adjusting the speed of the first and second godet rolls so that the elongation is 44% and the winding tension is 1.3 cN, A 11-decitex 5-filament polyamide filament was wound up. In the operability evaluation using 100 kg of raw material, the yarn was not broken and the fluctuation of the winding tension was small and stable.

  After extracting the oil agent with trichlorethylene, it was confirmed by evaporating trichlorethylene at 100 ° C. and measuring the weight of the residue. The oil content was 1.0% by weight. The wound package was free of yarn dropping, had a good foam, smooth unwinding, and was an excellent package.

Comparative Example 2
Unless otherwise specified, spinning was carried out in the same manner as in Example 1 as follows. As the shape of the discharge hole, a discharge hole having round holes at both ends of the slit (when the slit width H of the discharge hole is 1, as shown in FIG. 15, the discharge hole length N / H = 4.4 in the slit direction, The diameter of the round hole D / H = 1.3), the elongation of 44%, and the speed of the first and second godet rolls are adjusted so that the winding tension is 1.3 cN. The polyamide filament was wound up. In the operability evaluation using 100 kg of raw material, the yarn was not broken and the fluctuation of the winding tension was small and stable.

  The cross-sectional shape was an oval shape in which no concave portion was present on the long axis surface, and the cross-sectional shape was a cross-sectional shape (FIG. 7) where L = S was 2.0. After extracting the oil agent with trichlorethylene, it was confirmed by evaporating trichlorethylene at 100 ° C. and measuring the weight of the residue. The oil content was 1.0% by weight. The wound package was free of yarn dropping, had a good foam, smooth unwinding, and was an excellent package.

Comparative Example 3
Unless otherwise specified, spinning was carried out in the same manner as in Example 1 as follows. As the shape of the discharge hole, three Y-shaped slits from the center are maintained while maintaining an angle of 120 ° (a slit having a slit width of 0.07 mm and a slit length of 1.0 is 120 ° from the center) 11 decitex 5-filament by adjusting the speed of the first and second godet rolls so that the elongation is 44% and the winding tension is 1.3 cN. The polyamide filament was wound up. In the operability evaluation using 100 kg of raw material, the yarn was not broken and the fluctuation of the winding tension was small and stable.

  The cross-sectional shape was Y-shaped, and the cross-sectional shape (FIG. 8) was M value = 2.4 obtained by dividing the circumscribed circle diameter (OC) of the cross section by the inscribed circle diameter (IC). After extracting the oil agent with trichlorethylene, it was confirmed by evaporating trichlorethylene at 100 ° C. and measuring the weight of the residue. The oil content was 1.2% by weight. The wound package had no yarn dropping, but the drum end face swelled greatly.

Comparative Example 4
Unless otherwise specified, spinning was carried out in the same manner as in Example 1 as follows. The shape of the discharge hole is a discharge hole in which two short slits are parallel and orthogonal to a long slit in a square shape (slit width of 0.07 mm, slit width of 3.0 mm and a slit width of 0 .07mm, slit length 1.0mm slits are arranged horizontally and symmetrically in the shape of a key) so that the elongation is 44% and the winding tension is 1.3 cN. The first and second godet rolls were adjusted to take up 11 decitex 5-filament polyamide filaments. In the operability evaluation using the raw material of 100 kg, there were many yarn breaks due to the complexity of the thread breakage twice and the nozzle discharge hole. Moreover, the fluctuation of the winding tension was small and stable.

  The cross-sectional shape was K-shaped, and an inflection point existed between the apex of the long axis surface and the end of the flat cross section constituting the long axis (FIG. 9). That is, it has a shape in which two convex portions are projected from the long axis surface of the oval flat cross section. Flatness = L / S was 2.5 and S / BS = 2.0. After extracting the oil agent with trichlorethylene, it was confirmed by evaporating trichlorethylene at 100 ° C. and measuring the weight of the residue. The oil content was 1.2% by weight. The wound package had no yarn dropping, but the drum end face swelled greatly.

Comparative Example 5
Unless otherwise specified, spinning was carried out in the same manner as in Example 1 as follows. As the shape of the discharge hole, a discharge hole having round holes at both ends of the slit (as shown in FIG. 15, a 0.15 mm round hole per single yarn is arranged with a center distance of 0.2 mm) is used. Was 44%, and the speeds of the first and second godet rolls were adjusted so that the winding tension was 1.3 cN. In the operability evaluation using 100 kg of raw material, the yarn was not broken and the fluctuation of the winding tension was small and stable.

  The cross-sectional shape is such that there is one concave portion on the long axis surface, flatness = L / S is 1.3, S / BS = 1.20, and there is a concave portion in the center of the oval cross section. It was. After extracting the oil agent with trichlorethylene, it was confirmed by evaporating trichlorethylene at 100 ° C. and measuring the weight of the residue. The oil content was 1.0% by weight. The wound package was free of yarn dropping, had a good foam, smooth unwinding, and was an excellent package.

Comparative Example 6
Unless otherwise specified, spinning was carried out in the same manner as in Example 1 as follows. As the shape of the discharge hole, a discharge hole having round holes at both ends of the slit (when the slit width H of the discharge hole is 1, as shown in FIG. 15, the discharge hole length N / H = 24.0 in the slit direction, The diameter of the round hole D / H = 2.1) was used, and the speeds of the first and second godet rolls were adjusted so that the elongation was 44% and the winding tension was 1.3 cN. In the operability evaluation using 100 kg of raw material, there was a little yarn breakage after one yarn breakage, and the variation in winding tension was slightly large.

  The cross-sectional shape has one concave portion on the long axis surface, flatness = L / S is 4.5, and S / BS = 1.20, which is a cross-sectional shape like a dogbone. After extracting the oil agent with trichlorethylene, it was confirmed by evaporating trichlorethylene at 100 ° C. and measuring the weight of the residue. The oil content was 1.0% by weight. The wound package was free of yarn dropping, had a good foam, smooth unwinding, and was an excellent package.

  Using the obtained polyamide filaments of Examples and Comparative Examples as sheath yarn and polyurethane elastic yarn (Mobilon K type fineness 19 dtex manufactured by Nisshinbo Co., Ltd.) as the core yarn, draft ratio 2.6 times, covering twist number 11 dtex , 2200 T / m, 9 decitex, 2400 T / m, 13 decitex, 2000 T / m, and S twist covering and Z twist covering, respectively, to obtain two types of covering yarns.

  Using the above-mentioned covering yarn, the S-direction single covering yarn and the Z-direction single covering yarn are alternately supplied to the yarn feeder of the knitting machine with a super 4 knitting machine (400 stitches) manufactured by Nagata Seiki Co., Ltd. Part knitted fabric was knitted only with covering yarn. After scouring, it was dyed pale brown (98 ° C. × 20 min), finished and a template set (steam set, 110 ° C. × 60 sec) to obtain a pantyhose product.

  The angle dependence of the knitted fabric reflected light intensity was measured, and the results of Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3 are shown in FIGS. FIG. 12 shows the circular cross section of Comparative Example 1, and FIG. 13 shows the measurement results of the angle dependence of the knitted fabric reflected light intensity of stockings using the oval type covering multifilament polyamide filament of Comparative Example 2. In both cases, when the angle of the incident light with respect to the knitted fabric is 45 °, a peak of reflected light intensity is seen at an angle of 45 °, which is regular reflection, and around 90 ° horizontal to the surface of the knitted fabric. That is, when assuming the case where stockings are worn, a peak of reflected light intensity is seen near 90 ° parallel to the surface of the knitted fabric, and thus strong reflected light is generated on the side of the foot as viewed from the observer. That is, it shows that it looks whitish by strong reflected light from both sides of the foot.

  On the other hand, FIG. 11 shows the measurement results of the angle dependency of the knitted fabric reflected light intensity of the stockings using the polyamide multifilament for covering yarn of Example 1. From the incident light direction (-45 °) to the regular reflection direction (45 °), it was the same as the round cross-section or oval cross-sectional shape, but the reflected light intensity peaked around 90 ° parallel to the surface of the knitted fabric. Was not seen. This was the same peak shape in the stockings of the stockings using other examples.

  Further, FIG. 14 shows the measurement results of the angle dependence of the knitted fabric reflected light intensity of stockings using the Y-shaped polyamide multifilament for covering yarn of Comparative Example 3. When compared with FIGS. 11 to 13, the peak of regular reflection (45 °) is low as compared to the incident light direction (−45 °) to specular reflection (45 °), but the peak of regular reflection (45 °) is low. The feature is that no peak of reflected light intensity is observed near 90 ° parallel to the surface. That is, when the case where a stocking is worn is assumed, the whole leg | gear is shining whitish and it means lacking in transparency. Similarly, the stockings using Comparative Example 4 had the same angle dependency of the reflected light intensity as Comparative Example 3. Further, Comparative Examples 5 and 6 had the same angle dependency of the reflected light intensity as Comparative Examples 1 and 2.

  The stockings using the polyamide multifilaments for the covering yarns of Comparative Examples 1 to 3 and Example 1 were actually put on the foot used for measuring the angle dependency of the reflected light intensity of the knitted fabric, and placed vertically facing the north window. The observer observed toward the window. In addition, the sample dyed light brown was used. In Comparative Example 3, the entire image was whitish and clear. In Comparative Examples 1 and 2, although excellent in transparency as compared with Comparative Example 3, it was a level that strongly felt that wearing the stockings because the side portion of the foot looks whitish when viewed from the observer . On the other hand, in Example 1, whitish light on the side surface portion of the foot was suppressed while having transparency at the same level as or higher than that in Comparative Examples 1 and 2, and the bare foot feeling was excellent.

  Also in the stockings using the polyamide multifilament for covering yarns of other examples, whitish light on the side surface of the foot was suppressed as in Example 1, and the bare foot feeling was excellent. On the other hand, Comparative Example 4 shines whitish as in Comparative Example 3 and does not feel transparent, and Comparative Examples 5 and 6 have a side portion of the foot that looks whitish as in Comparative Examples 1 and 2. It was a level that felt strongly that I was wearing.

  In Table 1, pantyhose dyed in light brown is placed on the foot used to measure the angle dependence of the reflected light intensity of the knitted fabric and placed vertically facing the north window. The evaluation result by three product development experts of pantyhose was described about transparency and shadow effect. The transparency was classified into three stages: ◎: excellent transparency, ◯: general product level, x: poor transparency. The shadow effect was evaluated in three stages: ◎: excellent, ○: general merchandise level, x: inferior.

  The pantyhose of the example was excellent in the leg effect because of its high transparency and high shadow effect. On the other hand, Comparative Examples 3 and 4 were generally whitish and clearly inferior in transparency. Moreover, Comparative Examples 1 and 5 were transparency and a shadow effect at a general commodity level. Further, in Comparative Examples 2 and 6, although the transparency was excellent, the shadow effect was inferior to that of the Examples.

Moreover, when comparison of tactile sensation was carried out by three product development experts of pantyhose, comparative example 2 was soft based on comparative example 1, while comparative examples 3 and 4 were coarse. It was. On the other hand, in the examples, the whole skin was smooth and had a good tactile sensation, and the tendency was particularly strong in Comparative Example 7 and Example 9.

  Moreover, the covering state of the covering yarn was observed in a state where the finished pantyhose was put in a foot shape and extended. In the product using the polyamide filament for the covering yarn of the example, the periphery of the spandex was coated in a ribbon shape, the exposed portion of the spandex was small, and the covering property was good. Moreover, it was excellent as a product quality of pantyhose.

  On the other hand, in Comparative Examples 3 and 4, the number of twists of covering was not stable, and a portion running together with a twisted pile and elastic yarn was also observed. In Comparative Examples 1 and 5, an elastic yarn that was relatively well coated but not partially coated was observed. Moreover, Comparative Example 2 and Comparative Example 6 had good coverage as in the Examples.

An example of a flat cross section having one recess on the long axis surface of the present invention Another example of a flat cross section having one recess on the long axis surface of the present invention An example of a flat cross section having two concave portions on the long axis surface of the present invention Another example of a flat cross section having two concave portions on the long axis surface of the present invention Another example of a flat cross section having one recess on the long axis surface of the present invention Another example of a flat cross section having one recess on the long axis surface of the present invention Example of a cross-section of a comparative example Example of Y-shaped cross section of comparative example Example of cross section of comparative example Explanatory diagram of positional relationship in angle dependence measurement of knitted fabric reflected light intensity Example of angular dependence measurement result of knitted fabric reflected light intensity of stockings using polyamide multifilament for covering yarn shown in Example 1 of the present invention Example of measurement results of angle dependence of knitted fabric reflected light intensity of stockings using round cross section polyamide multifilament (Comparative Example 1) Example of measurement results of angle dependence of knitted fabric reflected light intensity of stockings using oval cross section polyamide multifilament (Comparative Example 2) Example of measurement results of angle dependence of knitted fabric reflected light intensity of stockings using Y-shaped polyamide multifilament (Comparative Example 3) Example of discharge hole shape

Explanation of symbols

L: length of the long side, S: length of the short side, BS: length of the bottom of the concave portion, LP: an ellipse surrounding a portion facing the lower long side of the circumscribed rectangle, OC: circumscribed circle, IC : Inscribed circle, H: slit width, N: discharge hole length, D: diameter of round hole

Claims (3)

When the total fineness is 7 to 15 dtex, and the cross-sectional shape is the long side length L and the short side length S of the rectangle circumscribing the cross section, the flatness = L / S is 1.5 to 4.0. The S / BS, which is the ratio of the short side length S to the recess bottom portion length BS , has a flat cross section of 1.05 to 2.50 , and is symmetrical with respect to the long axis of the flat cross section, A polyamide multifilament for covering yarn having one or two concave portions on a major axis surface and having no inflection points at both ends of a flat cross section other than the concave portions. Covering yarn using the covering yarn for polyamide multifilament of Claim 1, wherein the multifilament for covering yarn to the core yarn made of elastic fibers. 3. A stocking using the covering yarn according to claim 2 as at least one part of a leg part.

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