JP2001064825A - Elastic yarn for sanitary product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously raise the adhesion of an elastic yarn to a substrate while maintaining unwinding properties of the elastic yarn. SOLUTION: This multifilament elastic yarn is obtained by dry spinning an elastic polymer and has a flat cross section of >=2 ratio (Ll/Ls) of the long side (Ll) to the short side (Ls) of a rectangle circumscribed with the filament cross section of the elastic yarn. Furthermore, unevennesses are preferably formed by an outer shape of the single filaments on the surface of the elastic yarn and the length ratio (L1/L2) of the perimeter (L1) of the rectangle circumscribed with the filament cross section of the elastic yarn to the perimeter (L2) of the filament cross section of the elastic yarn has <=0.9 degree of the unevennesses.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to elastic yarns for sanitary products such as disposable diapers and sanitary napkins, and more particularly, to elastic yarns for maintaining good adhesiveness to base materials via an adhesive in sanitary products. Regarding yarn.

[0002]

2. Description of the Related Art In recent years, a wide variety of products for sanitary use (hereinafter referred to as sanitary wares) such as disposable diapers and sanitary napkins have been developed in a wide variety of products, and the quality requirements for them have become more stringent. In such a sanitary ware product, in order to improve the fit to a mounting site, elasticity is imparted by using an elastic yarn obtained by spinning an elastic polymer in combination. Such an elastic yarn is usually bonded via an adhesive to a portion of a base material of a sanitary ware made of a cloth, a nonwoven fabric, a sheet, or the like, to which elasticity is to be imparted.

When an elastic yarn is used in a sanitary ware product, the elastic yarn is usually supplied to the sanitary ware from a wound body wound in a cheese-like form, unwound while being stretched, and coated with an adhesive. It is guided to a nonwoven fabric or a sheet, etc., and is bonded to a cloth, a nonwoven fabric, a sheet, or the like by applying pressure to the bonding surface.

[0004]

The elastic yarn used for the use of a sanitary ware product is stretched in order to impart a stretch property to the sanitary ware product, and is applied to a base material made of a cloth, a nonwoven fabric or a sheet via an adhesive. Glued. Therefore, if the adhesive force between the stretched and bonded elastic yarn and the base material is insufficient, the elastic yarn peels off and shrinks from the base material, and the drawn elastic yarn occurs in the manufactured safety material product. , The quality of the product will deteriorate.

[0005] Further, since the elastic yarn wound in the cheese form is wrapped around the inner layer of the cheese, there arises a problem that the elastic yarn breaks or the supply tension fluctuates in the process of manufacturing the safety material product. . Therefore, the surface is usually treated with an oil agent for the purpose of preventing the unwinding property from being deteriorated and the tension from fluctuating. When such an elastic yarn is adhered to a base material such as a fabric or a non-woven fabric of a sanitary ware, the adhesion to the base material becomes insufficient, and the above-described problem occurs. If the amount of oil agent attached is reduced to avoid a decrease in the adhesiveness of the elastic yarn, the unwinding property of the elastic yarn cheese will deteriorate, and the yarn breakage and supply tension of the elastic yarn will fluctuate in the manufacturing process of the sanitary products. Cause problems. Further, if the amount of the adhesive applied is increased in order to improve the adhesiveness of the elastic yarn, the cost of the product is increased and the feeling and the air permeability of the sanitary ware are impaired.

The present invention has been made in view of the above circumstances, and has as its object to improve the adhesiveness to a base material while maintaining the unwinding property of an elastic yarn.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to solve the above-mentioned problems, and as a result, the problem of poor adhesion between the base material and the elastic yarn in the sanitary ware product has been reported. The present inventors have found that by devising the shape of the elastic yarn, it is possible to increase the adhesiveness while maintaining the unwinding property, and based on this finding, completed the present invention. That is, the present invention is as follows.

(1) A multifilament elastic yarn obtained by dry-spinning an elastic polymer, wherein a long side (L _l ) and a short side (L _s ) of a rectangular shape circumscribed around the yarn cross section of the elastic yarn. An elastic yarn for a sanitary ware product having a flat section having a length ratio (L ₁ / L _s ) of 2 or more.

(2) On the surface of the elastic yarn, irregularities due to the cross-sectional shape of a single yarn constituting the elastic yarn are formed, and the rectangular circumference (L1) circumscribed around the yarn cross-section of the elastic yarn and the elasticity The elastic yarn for a sanitary ware product according to the above (1), wherein a length ratio (L1 / L2) of the yarn cross section to the circumferential length (L2) is 0.9 or less.

(3) The sanitary ware product according to (1) or (2), wherein an oil agent is applied to the surface of the elastic yarn, and the applied amount of the oil agent is 0.01 to 5% by weight based on the weight of the yarn. For elastic yarn.

(4) The elastic yarn for a sanitary ware product according to any one of (1) to (3), wherein the fineness is in the range of 155 to 2490 dtex.

(5) The elastic yarn for a sanitary ware product according to any one of the above (1) to (4), wherein the elastic polymer is polyurethane.

In the present invention, the long side (L _l ) and the short side (L _s ) of the rectangular shape circumscribed on the thread cross section of the elastic yarn are determined by fixing the elastic yarn on a work table with a double-sided tape, Using a blade, cut with a load of 490 cN or more perpendicular to the length direction of the elastic yarn, magnify the cross section with a magnifying glass, take a picture, and make the long side of the rectangle circumscribed to the elastic yarn cross section shown in the photograph. The short side was measured.

The perimeter (L1) of the rectangle circumscribed on the cross section of the elastic yarn and the perimeter (L2) of the cross section of the elastic yarn are defined as the perimeter of the rectangle circumscribed on the cross section of the elastic yarn in the above photograph. And the circumference of the cross section of the elastic yarn shown in the photograph. When there are a plurality of rectangles that can be circumscribed on the elastic yarn cross section shown in the photograph, the rectangle that maximizes L ₁ / L _s is adopted.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The elastic yarn for sanitary ware of the present invention has a length ratio (L _l ) of a long side (L _l ) and a short side (L _s ) of a rectangle circumscribed on the cross section of the elastic yarn. / L _s ) is a multifilament elastic yarn having a flat cross section of 2 or more.

The elastic yarn for sanitary products obtained by conventional dry spinning is generally obtained by extruding a solution of an elastic polymer into the spinning cylinder through the pores of a spinneret, and interlacing a plurality of single yarns with a false twisting machine. The target denier yarn is manufactured by fusing in the fiber length direction. Even if the elastic yarn obtained by such a manufacturing method is a flattened one, the ratio of the length of the long side to the short side of the rectangle circumscribed on the yarn cross section of the elastic yarn was less than 2. The elastic yarn for a sanitary ware of the present invention has a high flatness in which the length ratio (long side / short side) of a long side and a short side (long side / short side) circumscribed to the thread cross section of the elastic yarn is 2 or more. This allows the contact area (compared with the same fineness) to the base material of the safety material to be larger than that of the conventional elastic yarn.
Increases adhesive strength. Further, when the elastic yarn for sanitary products of the present invention is used for diapers and the like, the thread has a high flatness, so that the area of close contact of the sanitary products with the body is increased, and the ability to prevent excrement leakage is improved. In addition, there is an advantage that the feeling of oppression is reduced due to the dispersion of the tightening force.

In the elastic yarn of the present invention, the longer the length ratio (L ₁ / L _s ) of the long side (L _l ) and the short side (L _s ) of the rectangle circumscribed on the yarn cross section, the larger the ratio to the substrate. However, if it is too large, the unwinding property from cheese tends to decrease. Therefore, it is preferable to be in the range of 2 to 8.

The method for producing the elastic yarn of the present invention is not particularly limited, and examples thereof include the following method. In other words, the work of entangling all the single yarns extruded from the spinneret collectively by the false twisting machine, which was performed in the conventional dry spinning, is not performed, and the single yarn extruded from the spinneret is wound up with a spinning cylinder. Between the machines, they are rubbed against the guide, focused on the guide and fused. Thereby, a high flatness yarn can be obtained. Here, the shape and material of the yarn convergence guide for bundling the single yarn are not particularly limited. For example, a member having a U-shaped guide groove or a round hole guide hole is used. When the single yarn is rubbed on the inner surface, a flat cross section is stably formed in the yarn length direction, which is preferable. The material of the guide is preferably made of ceramics in that the contact friction with the yarn is reduced. In the case of a member that guides the yarn on the inner surface of the guide hole of the round hole, the diameter of the round hole is 1 to
A range of 15 mm is preferred, and a range of 2 to 5 mm is particularly preferred. Depending on the fineness of the elastic yarn and the number of single yarns, etc., if the diameter of the round hole is less than 1 mm, the yarn friction on the inner surface of the round hole will increase, and if the spinning is performed for a long time, the single yarn will break. When the diameter of the round hole is larger than 15 mm, the contact between the single yarns becomes insufficient, and the single yarns may not be stably fused in the yarn length direction.

Another method for obtaining the elastic yarn of the present invention is as follows.
The plurality of single yarns extruded from the spinneret are divided into two or more groups, and in each group, the single yarns are entangled with a false twisting machine to form two or more yarns, and the two or more yarns are used as guides. A method of forming a yarn having a desired fineness by rubbing and combining (fusing) on a guide.

When these exemplified methods are used, all the spun single yarns are not entangled at once, and the fusion and unification of all the single yarns are performed.
Since the yarn is bundled on the guide, the length ratio (L ₁ / L _s ) of the long side (L ₁ ) and the short side (L _s ) of the rectangle circumscribed on the yarn cross section is 2 or more. A highly flat yarn having a flat cross section can be easily obtained, and the yarn surface has irregularities due to the surface of the single yarn. In particular, in the yarn obtained by the former method, since the single yarns are not entangled at all, irregularities due to the surface of the single yarns are remarkably shown on the yarn surface. That is, due to the flattening of the cross section and the increase in the yarn surface area due to the surface unevenness, the contact area (comparison with the same fineness) with the adhesive is dramatically increased as compared with the conventional elastic yarn. In addition, the surface area of the yarn increases as the degree of unevenness of the yarn surface increases, and an improvement in the adhesive strength can be expected. Therefore, the circumference (L1) of the rectangle circumscribing the yarn cross section and the circumference (L1) of the yarn cross section
The degree of unevenness represented by the length ratio (L1 / L2) to 2) is preferably 0.9 or less, more preferably 0.85 or less, and particularly preferably 0.80 or less. However, the higher the degree of unevenness of the yarn surface, the weaker the fusion between the single yarns and the easier the single yarns are to be separated, so that the length ratio (L1 / L2) is preferably 0.4 or more.

When the elastic yarn of the present invention is obtained by the above-described method, the distance between the furthest pores of the spinneret (A) and the distance from the spinneret to the yarn collecting guide (B)
The ratio (B / A) is preferably larger than 10. If (B / A) is 10 or less, the angle of the single yarn entering the guide is large, and there is a risk that the yarn may break due to friction with the guide.

Although the fineness of the elastic yarn of the present invention is not particularly limited, it is generally 155 to 2490 dtex (140 to 2).
240 denier), preferably 470-940 dtex (420-840 denier). The fineness of the single yarn is generally 9 to 22 dtex (8 to 20 denier), preferably 11 to 17 dtex (10 to 15 denier).
Denier). The single yarn may have a round cross section or an irregular cross section.

The elastic yarn of the present invention is wound up by a winder and finally made into cheese. Before the yarn is wound up by the winder so that the yarn can be easily unwound from the cheese. An oil agent is applied. The amount of the oil agent attached is preferably 0.01 to 5% by weight based on the weight of the yarn. When the content is in the above range, the adhesiveness and the unwinding property are both good.

The adhesion amount of the oil agent is determined by the weight of the wound body X obtained by winding the elastic yarn (yarn) exactly 20,000 m by the winding roller without applying the oil agent, and the elastic yarn (yarn). The weight of the wound body Y obtained by applying an oil agent to the sample and winding it up by 20,000 m with a winding roller is measured, and these values are obtained by applying the following formulas. Oil adhesion (%) = ｛(weight of wound body Y) − (winded body X
Weight)｝ / (weight of wound body X) × 100

As the elastic polymer used as a raw material of the multifilament elastic yarn of the present invention, polyurethane, polyolefin elastomer, polyester elastomer, synthetic rubber and the like can be used.
Polyurethane is preferred in terms of physical and chemical durability. Needless to say, these elastic polymers can be used as a mixture of two or more kinds.

When a polyurethane is used, a copolymer of a polyol and a diisocyanate or a copolymer obtained by extending the chain of the copolymer with an amine compound is used.

Examples of the polyol include a polyether polyol represented by polytetramethylene glycol; a polyester polyol represented by polyethylene adipate; a polycaprolactone polyol, and a reaction product of a polyester glycol such as polycaprolactone with an alkylene carbonate. Polyester polycarbonate polyol; ethylene carbonate is reacted with a polyhydric alcohol such as ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, and the like, and the resulting reaction mixture is reacted with an organic dicarboxylic acid such as adipic acid, azelaic acid, sebacic acid, and the like. Reaction products are exemplified. Among these, it is preferable to use a polyether polyol from the viewpoint of excellent physical properties such as high elongation and recoverability, physical and chemical durability, and particularly excellent water resistance. These polyols may be used alone or in combination of two or more. The polyol has a molecular weight of 1000 to 400 from the viewpoint of the durability of elastic yarn.
0, preferably in the range of 1500-2300.

Examples of the diisocyanate include aromatic diisocyanates such as 4,4'-diphenylmethane diisocyanate, 1,5-naphthalene diisocyanate, 1,4-phenylene diisocyanate, 2,4-tolylene diisocyanate, and 2,6-tolylene diisocyanate; Aliphatic diisocyanates such as hexamethylene diisocyanate, 1,4-cyclohexane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, and isophorone diisocyanate. Of these,
It is preferable to use 4,4'-diphenylmethane diisocyanate in that the strength of the elastic yarn is increased. These diisocyanates may be used alone or in combination of two or more.

As the amine compound, an aliphatic, alicyclic or aromatic diamine is usually used. Specifically, ethylenediamine, 1,2-propylenediamine, 1,3
-Propylene diamine, 1,4-butylenediamine,
2,3-butylenediamine, 1,3-butylenediamine, hexamethylenediamine, cyclohexanediamine, phenylenediamine, tolylenediamine, xylenediamine, 3,3′-dichloro-4,4-biphenylamine, 2,6-diamino Pyridine, 4,4′-diaminodiphenylmethane and the like can be mentioned. These amine compounds may be used alone or in combination of two or more.

Examples of the terminal blocking agent used for terminal blocking include dimethylamine, monoethanolamine, n-
Propylamine, n-butylamine, diethylamine,
Examples thereof include ethanol, propanol (1-propanol, 2-propanol), and butanol (1-butanol, 2-butanol). The terminal blocking agent may be added after the chain extension, but may be added at the time of the prepolymer reaction (for example, at the time of the reaction between the polyol and the diisocyanate).
You may add at the time of chain extension.

As the oil agent to be applied to the elastic yarn, dimethyl silicone, a silicone oil such as a modified silicone in which a part of the methyl group of the dimethyl silicone is substituted with another alkyl group, a phenyl group, an amino group, or the like, a mineral oil, or the like is used. Is done.

The adhesive used for bonding the multifilament elastic yarn of the present invention to the base material of a sanitary product is used in this type of field for bonding the elastic yarn to the base material of the sanitary product. Known adhesives can be used and are not particularly limited,
A vinyl polymer-based, saturated polyester-based, or polyamide-based hot melt adhesive is preferred.

[0033]

The present invention will be described below in more detail with reference to examples and comparative examples.

The evaluation of the adhesiveness of the elastic yarns in the examples and comparative examples was performed by the following method. (1) A polyester nonwoven fabric manufactured by Toyobo Co., Ltd. for use as a thin material for sanitary materials is prepared and cut into a length of 12 cm and a width of 3 cm. Since the fluff surface and elasticity of the nonwoven fabric cause variations in the adhesiveness, the surface to be adhered is unified and evaluated. (2) Five elastic yarns are arranged on a cardboard without being relaxed under no tension, and attached with a cellophane tape. (3) A hot melt adhesive composed of an ethylene, propylene, butadiene, and styrene copolymer is melted at 170 ° and set so as to have a discharge rate of 5 g / min from a discharge machine.
In the vertical direction, the elastic yarn with the thick paper with the elastic yarn attached
The hot melt adhesive is applied linearly while moving at a speed of 30 m / min. Immediately after that, the nonwoven fabric shown in (1) was
The sample is pressure-bonded at a pressure of g / cm ² for 10 seconds to obtain a sample for measuring adhesiveness. The above sample was created by JT Toshi Corporation
The test was performed using an ASM-15 adhesive strength evaluation machine manufactured by Asahi Kasei. (4) The sample obtained as described in (3) above was stored in a room kept at 20 ° C. for 24 hours, and the nonwoven fabric and the elastic yarn were firmly fixed.
At 1573, the nonwoven fabric and the elastic yarn are pulled up and down and peeled off while being recorded on the chart paper. At this time, the strength required for the separation of the elastic yarn and the nonwoven fabric is read from the chart paper, and the value is defined as the adhesive strength (cN). (5) As a check of the change over time in the adhesiveness, the two are bonded and then stored in a room kept at 20 ° C. for 100 hours, and peeled off in the same manner as in (4). * Adhesive strength at which pull-in, which is a problem of elastic yarns in disposable diaper products, hardly occurs is 150 cN.
The above was regarded as a pass level.

Example 1 975 parts of polytetramethylene ether glycol having a molecular weight of 1,950 was added with 4,4 ′
-250 parts of diphenylmethane diisocyanate was added, stirred and reacted to obtain a prepolymer, and then the prepolymer was dissolved in dimethylacetamide.
1,2-propylenediamine was added to extend the chain, and the terminal was blocked with diethylamine to obtain a polyurethane solution.

Using a spinneret 1 in which four 7-hole round nozzles 1b are arranged in four rows in upper and lower rows on a nozzle holder 1a having a long side length of 25 cm and a short side length of 10 cm shown in FIG. The base 1 has a long axis whose godet rollers 5a, 5a
b was set so as to be parallel to the long axis direction (FIG. 1). The polyurethane solution is extruded through a spinneret 1 into a spinning tube 2 in which hot air of 240 ° C. flows, and the obtained 56 single yarns are rounded in a round hole of a ceramic yarn collecting guide 3 installed below the spinning tube 2. The single agent yarns are fused while being bunched in a flat shape by rubbing against the inner surface of the guide hole 3a, and the oil agent applying equipment 4 installed between the yarn collecting guide 3 and the godet roller 5a.
The godet rollers 5a, 5a
The resultant was wound at 300 m / min at b to obtain a polyurethane elastic yarn cheese 6A to which an oil agent was attached at 0.05% by weight.

The round guide hole of the yarn collecting guide 3 has a hole diameter of 3 mm and a hole length of 3 mm. The relationship between the dimension (A) between the furthest pores of the spinneret 1 and the distance (B) from the spinneret 1 to the yarn focusing guide 3 is such that B / A is 31.6.
It is. Dimethyl silicone was used as the oil agent. The fineness of the obtained polyurethane elastic yarn is 940 dtex,
The long side (L _l ) and short side (L _l ) of the rectangle circumscribed on the yarn section
_s ) has a length ratio (L ₁ / L _s ) of 6.4, and the rectangular circumference (L1) circumscribed around the yarn cross section and the circumference (L 1) of the yarn cross section
The length ratio (L1 / L2) to 2) was 0.75. The adhesion evaluation test described above was performed using the polyurethane elastic yarn thus obtained. Table 1 shows the results.

(Example 2) In the same manner as in Example 1 except that the amount of the oil agent was changed to 3% by weight, the fineness was 940 dtex, and the long side (L _l ) of the rectangle circumscribed around the yarn cross section was short. side length ratio _{(L s) (L l /} L s) is 6.2, the peripheral length of the rectangle is circumscribing the yarn cross-section (L1) and the yarn length ratio of the circumferential length (L2) of the section A polyurethane elastic yarn having (L1 / L2) of 0.76 was obtained. Using the polyurethane elastic yarn, the above-mentioned adhesion evaluation test was performed. The results are shown in Table 1 below.

Example 3 Using the apparatus shown in FIG. 3, an elastic yarn was produced using the same polyurethane solution as in Example 1 above. The spinneret 1 and the spinning cylinder 2 are the same as those in FIG.
The yarn collecting guide 3 ′ is a ceramic U-shaped guide (FIG. 4), in which the width (x) of the U-shaped groove is 5 mm and the length (y) of the U-shaped groove is 3 mm. Single yarns extruded from the four nozzles on the right side and the four nozzles on the left side of the round nozzle 1b of the spinneret 1 (see FIG. 2) are passed through two false twisting machines 7a and 7b respectively arranged below the spinning tube 2. The two cross-sections form a substantially circular yarn, and then the false twisting machine 7
15 cm below a and 7b, these two yarns are bundled by a yarn gathering guide 3 'made of a U-shaped member to form one yarn, and the yarn is formed into a yarn gathering guide 3'. And Godet Roller 5
While the oil agent is being applied by the oil agent application equipment 4 installed between the two, the godet rollers 5a and 5b wind up the wound at 300 m / min with the godet rollers 5a and 5b, and the polyurethane elastic yarn cheese 6B having a fineness of 940 dtex with the oil agent adhered to 0.05% by weight. Obtained.
B / A was set to 31.6 as in Example 1. The length ratio (L ₁ / L _s ) of the long side (L ₁ ) and the short side (L _s ) of the rectangle circumscribed on the yarn cross section of the obtained polyurethane elastic yarn is 2.
In 2, the length ratio (L1 / L2) of the circumference (L1) of the rectangle circumscribed to the yarn cross section and the circumference (L2) of the yarn cross section is 0.
70. Using the polyurethane elastic yarn, the above-mentioned adhesion evaluation test was performed. The results are shown in Table 1 below.

Comparative Example 1 Using the apparatus shown in FIG. 5, an elastic yarn was produced using the same polyurethane solution as in Example 1 above. In FIG. 5, a spinneret 1 and a spinning cylinder 2 are the same as those in FIG. False twisting machine 7 installed below spinning cylinder 2
Then, 56 single yarns extruded from the spinneret 1 are entangled and fused to form a yarn, and the godet roller 5 is applied while applying an oil agent by an oil application facility installed below the false twisting machine 7.
a, 5b, wound up at 300m / min.
A 6% polyurethane elastic yarn cheese 6C having a fineness of 940 decitex adhered by weight% was obtained. The length ratio (L ₁ / L _s ) of the long side (L _l ) and the short side (L _s ) of the rectangle circumscribed to the cross section of the obtained polyurethane elastic yarn is 1.1, and The length ratio (L1 / L2) of the circumference (L1) of the circumscribed rectangle to the circumference (L2) of the yarn cross section was 0.61. Using the polyurethane elastic yarn, the above-mentioned adhesion evaluation test was performed. The results are shown in Table 1 below.

[0041]

[Table 1]

As can be seen from Table 1, the elastic yarn of the embodiment adheres to the non-woven fabric coated with the adhesive with a high adhesive strength.
Even after a lapse of time, the high adhesive strength was maintained. On the other hand, in the comparative example, the adhesive strength after 24 hours was a pass level (150 cN).
, But after 100 hours, the adhesive strength was lower than 150 cN.

[0043]

As is apparent from the above description, the elastic yarn for a sanitary ware of the present invention has improved adhesion to a substrate to which an adhesive has been applied as compared with conventional elastic yarns, and unwinds from cheese. The properties are also good. Therefore, it is possible to stably manufacture a highly reliable sanitary ware product without drawing in the elastic yarn.

[Brief description of the drawings]

FIG. 1 is a schematic view of an example of an apparatus for producing an elastic yarn of the present invention.

FIG. 2 is a detailed view of a spinneret of the apparatus of FIG.

FIG. 3 is a schematic view of another example of an apparatus for producing an elastic yarn of the present invention.

FIG. 4 is a detailed view of a U-shaped guide of the apparatus of FIG. 3;

FIG. 5 is a schematic view of a conventional elastic yarn manufacturing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spinneret 1a Nozzle holder 2 Spinning cylinder 3, 3 'Guide for yarn bundling 4 Oil supply equipment 5a, 5b Godet roller 6A, 6B, 6C Elastic yarn cheese 7, 7a, 7b False twisting machine

Claims (5)

[Claims] 1. A polymer obtained by dry spinning an elastic polymer.
Multifilament elastic yarns
The long side of the circumscribed rectangle (L_l) And short side (L _s) Length
Ratio (L_l/ L_s) Has two or more flat sections.
Elastic yarn for sanitary products. 2. The elastic yarn has surface irregularities due to the cross-sectional shape of a single yarn constituting the elastic yarn formed on the surface of the elastic yarn, and has a rectangular circumference (L1) circumscribed around the yarn cross-section of the elastic yarn and an elastic yarn. The ratio of length (L1 / L2) to the circumference (L2) of the yarn cross section is 0.
The elastic yarn for a sanitary ware product according to claim 1, wherein the number is 9 or less. 3. The elastic yarn for a sanitary ware product according to claim 1, wherein an oil agent is applied to the surface of the elastic yarn, and the applied amount of the oil agent is 0.01 to 5% by weight based on the weight of the yarn. 4. The elastic yarn for a sanitary ware product according to claim 1, wherein the fineness is in a range of 155 to 2490 dtex. 5. The elastic yarn for a sanitary ware product according to claim 1, wherein the elastic polymer is polyurethane.