JP2001214350A - Compilation - Google Patents

Abstract

(57) [Summary] Abstract [Problem] When used for pantyhose applications, it is possible to obtain a product having a uniform knitted surface and excellent quality. Kind Code: A1 A knitting machine comprising two or more yarns composed of one or more single yarns, wherein the yarns include a multifilament elastic yarn which is converged without adhering or sticking. Earth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a knitted fabric. More specifically, the present invention relates to a knitted fabric capable of obtaining a product excellent in uniform quality of a knitted surface when used for pantyhose use or the like.

[0002]

2. Description of the Related Art Conventionally, knitted fabrics using elastic yarn have been used for pantyhose and the like. Such elastic yarns have been single- or double-covered by inelastic yarns such as polyamide fibers, and have been used as single-coated elastic yarns (SCY) or double-coated elastic yarns (DCY).
Conventional coated elastic yarns are disclosed, for example, in Japanese Unexamined Patent Publication No. 9-217227.
As disclosed in US Pat. No. 6,086,086, it has been common to use multifilament elastic yarns in which the filaments are joined together in a tacky state during the spinning stage.

[0003]

However, in the prior art, the unevenness of fineness in the longitudinal direction of the yarn is large, and when used for pantyhose, etc., the surface knitted surface is not uniform, and a streak-like "hikemura" However, there is a problem that a drawback called a problem occurs.

[0004] An object of the present invention is to solve the above-mentioned conventional problems, and when used for pantyhose applications, a knitted fabric capable of obtaining a product having a uniform knitted surface and excellent quality. To provide.

[0005]

The knitted fabric of the present invention has the following structure to solve the above-mentioned problems.

That is, a knitting characterized by comprising a multifilament elastic yarn composed of two or more yarns composed of one or more single yarns, wherein the yarns are converged without adhesion or sticking. Earth.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.

The multifilament elastic yarn used in the present invention will be described.

The multifilament used in the present invention refers to a multifilament composed of two or more yarns.
It is composed of a single or more elastic yarn.

[0010] In the present invention, the elastic yarn means a yarn formed from an elastic polymer.
For example, at least one selected from synthetic rubber, polyolefin elastomer, polyester elastomer, polyurethane and the like can be used.

In the present invention, a polyurethane polymer is particularly preferably used. The polyurethane polymer may be a polyurethane-urea copolymer, or a mixture or a copolymer of polyurethane and polyurethane-urea.

More specifically, the polyurethane polymer used in the present invention comprises two types of segments: (a) a long-chain polyether, a soft segment which is a polyester segment, and (b) an organic isocyanate and a diamine chain extension. A hard segment, which is a relatively short chain segment derived by reaction with an agent or a diol chain extender.

Usually, such a polyurethane polymer may be obtained by a prepolymer method in which a prepolymer product obtained by capping a hydroxyl-terminated soft segment precursor with an organic diisocyanate is chain-extended with a diamine or a diol, or May be obtained by a one-shot method in which all the raw materials are put in the same bath and polymerized,
Also, it may be obtained by other methods.

A typical polyether soft segment is polytetramethylene ether glycol (hereinafter referred to as P
TMG), those derived from 3-methyl-1,5-pentanediol, tetrahydrofuran, 3-methyltetrahydrofuran, and the like, and copolymers thereof. Among them, a polyether derived from polytetramethylene ether glycol is preferred. Typical polyester soft segments include (a) ethylene glycol, polytetramethylene ether glycol, 2,2-dimethyl-1,3-propanediol, and (b) dibasic acids such as adipic acid and succinic acid. And the like.

The soft segment may be from typical polyethers and polyesters, or from polycarbonate diols such as poly- (pentane-1,5-carbonate) diol and poly- (hexane-1,6-carbonate) diol. It may be a copolymer such as a formed polyetherester.

Typical examples of the organic diisocyanate used in the present invention are bis- (p-isocyanatophenyl) -methane (hereinafter abbreviated as MDI), tolylene diisocyanate (hereinafter abbreviated as TDI), bis- (4-isocyanate). Cyclohexyl) -methane (hereinafter abbreviated as PICM),
Hexamethylene diisocyanate, 3,3,5-trimethyl-5-methylenecyclohexyl diisocyanate and the like. Among them, MDI is particularly preferred.

Various diamines, for example, ethylenediamine, 1,3-cyclohexanediamine, 1,4-cyclohexanediamine, and the like are suitable as chain extenders for forming polyurethaneurea. Chain terminators can be included in the reaction mixture to help control the final molecular weight of the polyurethaneurea. Usually, it is preferable to use a monofunctional compound having an active hydrogen as the chain terminator, for example, diethylamine.

Further, the chain extender is not limited to the above-mentioned amine, and a diol may be used. For example, ethylene glycol, 1,3-propanediol, 4-butanediol, neopentyl glycol,
1,2-propylene glycol, 1,4-cyclohexanedimethanol, 1,4-cyclohexanediol,
1,4-bis (β-hydroxyethoxy) benzene, bis (β-hydroxyethyl) terephthalate and paraxylylene diol. The diol chain extender is 1
The diol is not limited to only one kind of diol, and may be composed of plural kinds of diols. Further, it may be used in combination with a compound containing one hydroxyl group that reacts with an isocyanate group. In this case, as a method for obtaining such a polyurethane, various methods such as a melt polymerization method and a solution polymerization method can be adopted. The method of polymerization is not particularly limited, and examples thereof include a method of synthesizing a polyurethane by simultaneously reacting a polyol, a diisocyanate, and a chain extender composed of a diol, and the like. Good.

In the present invention, the polyurethane polymer is a benzotriazole-based ultraviolet absorber, a hindered amine-based weathering agent, a hindered phenol-based antioxidant, various pigments such as titanium oxide and iron oxide, and barium sulfate. , A functional additive containing zinc oxide, cesium oxide, silver ions and the like.

In the present invention, the polyurethane polymer is preferably used as a polyurethane solution using a solvent, is preferably used as a polyurethane dispersion using a dispersion medium, and further, a mixture thereof may be used. preferable.

In the present invention, these solutions, dispersions and mixtures thereof are collectively referred to as stock solutions. Also,
In the present invention, a solvent, a dispersion medium, and a mixture thereof are collectively referred to as a medium.

A medium such as a solvent or a dispersion medium used for dissolving or dispersing the polyurethane polymer includes:
Any material may be used as long as it is inert to the polyurethane, but N, N-
It is preferable to use dimethylacetamide (hereinafter abbreviated as DMAc), dimethylformamide, dimethylsulfoxide, vinylpyrrolidone, or the like.

Although the concentration of the stock solution is not particularly limited, it is usually preferably in the range of 25% by weight to 80% by weight.

More preferably, 30% by weight or more and 60% by weight or more.
The range is as follows, and more preferably 35% by weight or more.
The range is 5% by weight or less.

If the content is less than 25% by weight, the amount of heat required for evaporation of a solvent or the like during dry spinning increases, and spinning tends to be difficult.

On the other hand, when the content exceeds 80% by weight, the stability of the stock solution deteriorates, as a result, the spinnability deteriorates, and when the degree of polymerization of the polymer is lowered to improve the stability of the stock solution, the yarn quality tends to deteriorate. There is.

The viscosity of the stock solution is 2500 poise or more and 5500
It is preferably equal to or less than poise. If the viscosity is 2500 poise or more, the yarn breakage due to the decrease in the viscosity during dry spinning is small, and the spinnability is good. If the viscosity is 5500 poise or less, the pressure loss at the die portion can be suppressed to some extent. Yarn quality can be improved.

The value of the viscosity is based on a steel ball drop type viscosity measurement method at 40 ° C.

The multifilament elastic yarn used in the present invention can be obtained by spinning the above polyurethane polymer. As a spinning method that can be adopted, any method such as a dry spinning method, a melt spinning method, and a wet spinning method may be used.

In the present invention, a dry spinning method can be particularly preferably employed. Spinning conditions such as the temperature of the stock solution, the ambient temperature, the discharge speed, the shape of the die, and the yarn take-up speed during dry spinning can be appropriately selected. The number of holes in the die is one or more to form one or more single yarns.

The multifilament elastic yarn used in the present invention is one in which two or more yarns composed of one or more single yarns are converged without bonding or sticking.

The yarn in the present invention is composed of one or more single yarns. When there are two or more such single yarns,
There may be a portion to be joined between the single yarns.

The number of single yarns is not particularly limited.
About 0 or less is preferable.

In the present invention, the number of yarns is two or more. In particular, the number of yarns is preferably in a range of 2 or more and 20 or less.

The fineness of the multifilament elastic yarn used in the present invention is preferably 5.6 to 344 dtex.

Specific examples of the multifilament elastic yarn used in the present invention are as follows.
When three yarns of 1 dtex converge to a joined state without bonding or sticking to form a multifilament elastic yarn having a total fineness of 33 dtex, the number of single yarns constituting the yarn is one or three. Any of the cases may be used.

The multifilament elastic yarn used in the present invention is one in which the yarn is converged without adhesion or sticking. In the present invention, a state in which the yarns converge without bonding or sticking is a state in which the yarns softened or melted in the spinning step are bonded or sticked together to form an apparently single yarn. Rather, it refers to a state in which the yarns converge without adhering or sticking, and in the converged state, there may be portions where the yarns are entangled with each other.

The converged state may be a state in which the yarn and another yarn are joined, but the yarn and the yarn are not adhered or adhered to each other, and each of the yarns is caused by a slight external force. The strips are easily separated. Alternatively, the yarn may not be in a state where the yarn and another yarn are joined, but may be in a slightly separated state. In the longitudinal direction of the yarn, the yarn may alternately have a state in which the yarn and another yarn are joined and a state in which the yarn is slightly separated. Further, there may be portions where the yarns are entangled with each other. The state in which the yarns are entangled with each other means that the yarns are in a state of being entangled with each other in a partially twisted or crossed state.

An example of a multifilament elastic yarn used in the present invention will be described with reference to the drawings. FIG. 1 shows a state in which the total fineness is 33 dtex, and three yarns 22 composed of one single yarn 21 and having a fineness of 11 dtex are converged without bonding or sticking.

FIG. 2 shows a state in which the total fineness is 33 dtex and three single yarns 21 having a fineness of 11 dtex are converged without bonding or sticking. Is shown.

FIGS. 1 and 2 show a portion where the yarns are slightly separated from each other.

In order to obtain such a yarn, it is preferable that, when producing the multifilament elastic yarn, the yarn is converged after substantially completely removing the medium on the surface of the yarn.

If the yarns are allowed to converge before the media on the yarn surface is substantially completely removed, the yarns will tend to adhere or stick together.

Hereinafter, a method for producing a multifilament elastic yarn used in the present invention will be described with reference to the drawings in the case of dry spinning.

FIG. 3 is a schematic view showing an example of a process for producing a multifilament elastic yarn used in the present invention.

The elastic polymer solution is discharged from the spinneret 11 into the yarn F, and then heated to substantially completely remove the medium on the yarn surface. The heating may be performed from a spinning cylinder or using a heating gas. Further, these may be used in combination. In the present invention, from the viewpoint of thermal efficiency, a method performed from a heating gas and a spinning cylinder is preferable.

In the present invention, substantially completely removing the medium on the yarn surface refers to evaporating the liquid medium by heating the medium to a temperature higher than the boiling point of the medium.

The shape of the spinning tube may be circular, rectangular, polygonal, or any other shape.

It is preferable that the heating gas is appropriately selected depending on the type of the volatile component of the medium. When the volatile component is a volatile organic solvent, it is preferable to use mainly an inert gas.

Each of the thus heated yarns passes through the first feed roll 12, the oil applying roll 14, and the second feed roll 15 without being adhered or adhered.
6 can be derived.

In the present invention, the yarn is converged after the medium existing on the yarn surface is substantially completely removed. In the present invention, it is preferable to use a guide to converge the yarn, but it may be converged by another method.

Such a guide may be provided at any position after the medium existing on the yarn surface has been substantially completely removed. Usually, however, the first feed roll 12 is provided as shown in FIG. And the second feed roll 15.

In the present invention, the intertwining of the yarn is
It is also preferable to carry out the method by the interaction between the guide and the winder, or to carry out by the guide.

The material of the guide is preferably titanium, ceramic or the like from the viewpoint of preventing yarn breakage due to frictional resistance.

In the present invention, it is also preferable that the multifilament elastic yarn is used as a core yarn and the core yarn is coated with a non-elastic yarn to be used as a coated elastic yarn.

The inelastic yarn used in the present invention will be described.

The inelastic yarn used in the present invention may be either a filament yarn or a spun yarn.

Specifically, the filament yarn is a single or composite synthetic fiber or silk (raw yarn) such as rayon, acetate, polyamide, polyester, acrylonitrile, polypropylene, vinyl chloride, etc. It may be any of a processed yarn or a yarn-dyed yarn, or may be a composite yarn of these filament yarns. All of these are preferably stable yarns that are easily twisted or covered.

The spun yarn is a staple made of natural fibers such as cotton, wool, hemp and silk, and synthetic fibers such as rayon, polyamide, polyester, acrylonitrile, polypropylene, and vinyl chloride. Any spun yarn may be used.

In the case of a filament yarn, the range is preferably from 6 to 333 dtex, more preferably from 6 to 22 dtex.

In the case of a spun yarn, the cotton count is 100 s to 1
A range of 0 s is preferred.

Next, a method for producing the coated elastic yarn used in the present invention will be described in detail with reference to FIG.

FIG. 4 is a schematic view showing an example of a covering machine used in the present invention.

When the coated elastic yarn used in the present invention is a filament yarn as the inelastic yarn, a commercially available covering machine is used to draft the multifilament elastic yarn serving as the core yarn, and the surrounding of the multifilament elastic yarn is drafted. It can be obtained by winding and covering with an inelastic yarn.

For example, it can be obtained by extracting an elastic yarn from the elastic yarn winding body 31 and winding it with an inelastic yarn unwound by the spindles 34 and 35.

In the present invention, a single coating may be used, or a double coating further coated with a further inelastic yarn may be used.

In the present invention, the number of twists is the fineness of the mating material,
Depending on the number of filaments, it can be selected appropriately,
It is preferably in the range of 3500 t / m, and in the case of double coating, the ply twist is preferably in the range of 400 to 3500 t / m.

In the twisting, the twisting direction is preferably opposite to the twisting direction from the viewpoint of counteracting the twisting torque, and the twisting number of the twisting is preferably selected appropriately so as to achieve a torque balance.

In the present invention, the draft is preferably in the range of 2 times or more and 6 times or less from the viewpoint of improving the processability.

Next, the knitted fabric of the present invention will be described.

The knitted fabric of the present invention can be obtained by using the above-mentioned multifilament yarn and appropriately selecting conditions using a commercially available knitting machine such as a circular knitting machine and a stocking knitting machine according to each application.

The knitted structure may be any of a basic structure such as a flat knit, a rubber knit, and a pearl knit, or a variable structure such as a tuck knit, a floating knit, a single-row knit, a double-sided knit, and a lace knit.

[0073]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The knitted fabric of the present invention will be described below in detail with reference to embodiments.

Example 1 2000 g of polytetramethylene ether glycol having a molecular weight of 2,000 and 400 g of diphenylmethane diisocyanate were charged into a stirred vessel sealed with nitrogen and reacted at 90 ° C. to obtain a prepolymer. Next, 699 g of this prepolymer was dissolved in 1288 g of dimethylacetamide, and 11 g of ethylenediamine as a chain extender and 1.6 g of diethylamine as a terminal blocking agent were added so that the molar ratio to the prepolymer was 1.05. The mixture was stirred and reacted at ℃ to obtain a polyurethane solution.

A stabilizer prepared by adjusting a modifier such as titanium oxide to a weight ratio of 6% was added to this polyurethane solution.
Added and stirred.

When the number average molecular weight of the polyurethane contained in the obtained polyurethane solution was measured by GPC method,
It was about 38,000 in terms of polystyrene.

The polyurethane solution is extruded from a spinneret and heated in a spinning cylinder so that the residual solvent on the surface becomes substantially 0% by the time the formed yarn reaches the first feed roll. The temperature of the gas, the air volume, and the temperature of the spinning cylinder were adjusted, and the film was wound at a winding speed of 1150 m / min. The convergence of the single yarn was performed by a guide provided between the first feed roll and the second feed roll. The obtained multifilament elastic yarn had a total fineness of 33 dtex, and three yarns each having one single yarn were converged. The obtained yarn was of excellent quality with small yarn spots.

Around the obtained multifilament elastic yarn, using a commercially available covering machine, nylon 6 (8 dtex-5f) was used as an inelastic yarn, and a 3.2-fold draft was applied. Twisting number (horizontal winding number) 2900T
/ M, and the number of twists of the upper thread (the number of weft turns) was 2465 T / M, and double winding was performed to obtain a double-coated elastic yarn.

Using the obtained double-coated elastic yarn, a knitted circular knitted fabric was knitted using a commercially available stocking knitting machine. The obtained knitted fabric has a uniform surface knitting surface,
It was of excellent quality without the drawbacks called so-called.

Example 2 1386 g of polytetramethylene ether glycol having a molecular weight of 2200, 472 g of diphenylmethane diisocyanate and 78 g of ethylene glycol were charged into 3064 g of dimethylacetamide.
Nitrogen was reacted in a stirred vessel at 85 ° C., and 20 g of butanol was added to obtain a polyurethane solution.

A stabilizer prepared by adjusting a modifier such as titanium oxide to a weight ratio of 6% was added to this polyurethane solution.
Added and stirred.

When the number average molecular weight of the polyurethane contained in the obtained polyurethane solution was measured by GPC method,
It was about 90,000 in terms of polystyrene.

The polyurethane solution is extruded from a spinneret and heated in a spinning cylinder so that the residual solvent on the surface becomes substantially 0% by the time the formed yarn reaches the first feed roll. The temperature of the gas, the air volume, and the temperature of the spinning cylinder were adjusted, and the film was wound at a winding speed of 1150 m / min. The convergence of the yarn was performed by a guide provided between the first feed roll and the second feed roll. The obtained multifilament elastic yarn had a total fineness of 33 dtex, and three yarns each having one single yarn were converged. The obtained yarn was of excellent quality with small yarn spots.

Using a commercially available covering machine, nylon 6 (11 decitex-5f) was used as a non-elastic yarn, and a 3.2-fold draft was applied around the obtained multifilament elastic yarn. The number of twists was 2400 T / M, and the number of twists of the upper thread was 2040 T / M, and double winding was performed to obtain a double-coated elastic yarn.

Using the obtained double-coated elastic yarn, a circular knitted fabric was knitted using a commercially available stocking knitting machine. The obtained knitted fabric has a uniform surface knitting surface,
It was of excellent quality without the drawbacks called so-called.

Example 3 2000 g of polytetramethylene ether glycol having a molecular weight of 2000 and 400 g of diphenylmethane diisocyanate were charged into a stirring vessel sealed with nitrogen and reacted at 90 ° C. to obtain a prepolymer. Next, 699 g of this prepolymer was dissolved in 1288 g of dimethylacetamide, and 11 g of ethylenediamine as a chain extender and 1.6 g of diethylamine as a terminal blocking agent were added so that the molar ratio to the prepolymer was 1.05. The mixture was stirred and reacted at ℃ to obtain a polyurethane solution.

When the number average molecular weight of the polyurethane contained in the obtained polyurethane solution was measured by GPC method,
It was about 38,000 in terms of polystyrene.

The polyurethane solution is extruded from a spinneret and heated in a spinning cylinder so that the residual solvent on the surface becomes substantially 0% by the time the formed yarn reaches the first feed roll. Gas temperature (360 ° C), air volume,
The spinning cylinder temperature (205 ° C) is adjusted and the winding speed is 661m
/ Min. The convergence of the yarn was performed by a guide provided between the first feed roll and the second feed roll. The obtained multifilament has a fineness of 33 dtex (3
0 denier), and four monofilament yarns were converged. The obtained yarn was of excellent quality with small yarn spots.

Around the obtained multifilament elastic yarn, a commercially available covering machine was used, and nylon 6 (11 decitex-5f) was used as an inelastic yarn. Single winding was performed at 1900 T / M to obtain a single coated elastic yarn.

Using the obtained single-coated elastic yarn, a circular knitted fabric was knitted using a commercially available circular knitting machine. The obtained knitted fabric had a uniform surface knitted surface and was of excellent quality without a defect called "Hikemura".

Example 4 Around the same multifilament elastic yarn used in Example 3, a commercially available covering machine was used, and nylon 6 (8 dtex-5f) was used as an inelastic yarn. Double drafting was performed, and the number of twists of the lower thread was set to 2400 T / M and the number of twists of the upper thread was set to 2040 T / M.

Using the obtained double-coated elastic yarn, a circular knitted fabric was knitted with a commercially available circular knitting machine. The obtained knitted fabric had a uniform surface knitted surface and was of excellent quality without a defect called "Hikemura".

Example 5 2000 g of polytetramethylene ether glycol having a molecular weight of 2,000 and 400 g of diphenylmethane diisocyanate were charged into a nitrogen-sealed stirring vessel and reacted at 90 ° C. to obtain a prepolymer. Next, 699 g of this prepolymer was dissolved in 1288 g of dimethylacetamide, and 11 g of ethylenediamine as a chain extender and 1.6 g of diethylamine as a terminal blocking agent were added so that the molar ratio to the prepolymer was 1.05. The mixture was stirred and reacted at ℃ to obtain a polyurethane solution.

When the number average molecular weight of the polyurethane contained in the obtained polyurethane solution was measured by GPC method,
It was about 38,000 in terms of polystyrene.

The polyurethane solution is extruded from the spinneret and heated in a spinning cylinder so that the residual solvent on the surface becomes substantially 0% by the time the formed yarn reaches the first feed roll. Gas temperature (350 ° C), air volume,
The spinning cylinder temperature (205 ° C) is adjusted and the winding speed is 567m
/ Min. The convergence of the yarn was performed by a guide provided between the first feed roll and the second feed roll. The obtained multifilament has a fineness of 44 dtex (4
0 denier), and four monofilament yarns were converged. The obtained yarn was of excellent quality with small yarn spots.

Around the obtained multifilament elastic yarn, using a commercially available covering machine, nylon 6 (11 decitex-5f) was used as an inelastic yarn, and a 3.2-fold draft was applied. Single winding was performed at 1900 T / M to obtain a single coated elastic yarn.

Using the obtained single-coated elastic yarn, a circular knitted fabric was knitted using a commercially available circular knitting machine. The obtained knitted fabric had a uniform surface knitted surface and was of excellent quality without a defect called "Hikemura".

Example 6 Around the same multifilament elastic yarn used in Example 5, a commercially available covering machine was used, and nylon 6 (8 dtex-5f) was used as an inelastic yarn. Double drafting was performed, and the number of twists of the lower thread was set to 2400 T / M and the number of twists of the upper thread was set to 2040 T / M.

Using the obtained double-coated elastic yarn, a circular knitted fabric was knitted using a commercially available circular knitting machine. The obtained knitted fabric had a uniform surface knitted surface and was of excellent quality without a defect called "Hikemura".

Example 7 2000 g of polytetramethylene ether glycol having a molecular weight of 2,000 and 400 g of diphenylmethane diisocyanate were charged into a stirred vessel sealed with nitrogen and reacted at 90 ° C. to obtain a prepolymer. Next, 699 g of this prepolymer was dissolved in 1288 g of dimethylacetamide, and 11 g of ethylenediamine as a chain extender and 1.6 g of diethylamine as a terminal blocking agent were added so that the molar ratio to the prepolymer was 1.05. The mixture was stirred and reacted at ℃ to obtain a polyurethane solution.

When the number average molecular weight of the polyurethane contained in the obtained polyurethane solution was measured by GPC method,
It was about 38,000 in terms of polystyrene.

The polyurethane solution is extruded from the spinneret and heated in a spinning cylinder so that the residual solvent on the surface becomes substantially 0% by the time the formed yarn reaches the first feed roll. Gas temperature (440 ° C), air volume,
The temperature of the spinning cylinder (230 ° C) is adjusted and the winding speed is 651m
/ Min. The convergence of the yarn was performed by a guide provided between the first feed roll and the second feed roll. The resulting multifilament has a fineness of 156 dtex,
Three yarns having five single yarns were converged. The obtained yarn was of excellent quality with small yarn spots.

Around the obtained multifilament elastic yarn, using a commercially available covering machine, nylon 6 (13 decitex-7f) was used as an inelastic yarn, and a 3.5-fold draft was applied. Single winding was performed at 2000 T / M to obtain a single coated elastic yarn.

Using the obtained single-coated elastic yarn, a circular knitted fabric was knitted by using a commercially available circular knitting machine. The obtained knitted fabric had a uniform surface knitted surface and was of excellent quality without a defect called "Hikemura".

Example 8 Around the same multifilament elastic yarn used in Example 7, a commercially available covering machine was used, and nylon 6 (13 decitex-7f) was used as an inelastic yarn. , And the number of twists of the lower thread was set to 2000 T / M, and the number of twists of the upper thread was set to 1700 T / M, and double wound to obtain a double-coated elastic yarn.

Using the obtained double-coated elastic yarn, a circular knitted fabric was knitted using a commercially available circular knitting machine. The obtained knitted fabric had a uniform surface knitted surface and was of excellent quality without a defect called "Hikemura".

Example 9 2000 g of polytetramethylene ether glycol having a molecular weight of 2,000 and 400 g of diphenylmethane diisocyanate were charged into a nitrogen-sealed stirring vessel and reacted at 90 ° C. to obtain a prepolymer. Next, 699 g of this prepolymer was dissolved in 1288 g of dimethylacetamide, and 11 g of ethylenediamine as a chain extender and 1.6 g of diethylamine as a terminal blocking agent were added so that the molar ratio to the prepolymer was 1.05. The mixture was stirred and reacted at ℃ to obtain a polyurethane solution.

When the number average molecular weight of the polyurethane contained in the obtained polyurethane solution was measured by GPC method,
It was about 38,000 in terms of polystyrene.

The polyurethane solution is extruded from a spinneret and heated in a spinning cylinder so that the residual solvent on the surface becomes substantially 0% by the time the formed yarn reaches the first feed roll. Gas temperature (360 ° C), air volume,
The spinning cylinder temperature (205 ° C) is adjusted and the winding speed is 661m
/ Min. The convergence of the yarn was performed by a guide provided between the first feed roll and the second feed roll. The obtained multifilament has a fineness of 33 dtex (3
0 denier), and four monofilament yarns were converged. The obtained yarn was of excellent quality with small yarn spots.

Using a commercially available covering machine, wooly nylon 6 (56 dtex-40f) was used as a non-elastic yarn, and the multifilament elastic yarn was drafted 3.5 times. At 500 T / M to obtain a single-coated elastic yarn.

Using the obtained single-coated elastic yarn, a circular knitted fabric was knitted using a commercially available circular knitting machine. The obtained knitted fabric had a uniform surface knitted surface and was of excellent quality without a defect called "Hikemura".

Example 10 2000 g of polytetramethylene ether glycol having a molecular weight of 2,000 and 400 g of diphenylmethane diisocyanate were placed in a nitrogen-sealed stirring vessel and reacted at 90 ° C. to obtain a prepolymer. Next, 699 g of this prepolymer was dissolved in 1288 g of dimethylacetamide, and 11 g of ethylenediamine as a chain extender and 1.6 g of diethylamine as a terminal blocking agent were added so that the molar ratio to the prepolymer was 1.05. The mixture was stirred and reacted at ℃ to obtain a polyurethane solution.

When the number average molecular weight of the polyurethane contained in the obtained polyurethane solution was measured by GPC method,
It was about 38,000 in terms of polystyrene.

The polyurethane solution is extruded from the spinneret and heated in a spinning cylinder so that the residual solvent on the surface becomes substantially 0% by the time the formed yarn reaches the first feed roll. Gas temperature (350 ° C), air volume,
The spinning cylinder temperature (205 ° C) is adjusted and the winding speed is 567m
/ Min. The convergence of the yarn was performed by a guide provided between the first feed roll and the second feed roll. The obtained multifilament has a fineness of 44 dtex (4
0 denier), and four monofilament yarns were converged. The obtained yarn was of excellent quality with small yarn spots.

Around the obtained multifilament elastic yarn, using a commercially available covering machine, using Woolly Nylon 6 (78 decitex-24f) as non-elastic yarn, a draft 3.5 times was applied, and the number of twists was increased. At 400 T / M to obtain a single-coated elastic yarn.

Using the obtained single-coated elastic yarn, a circular knitted fabric was knitted using a commercially available circular knitting machine. The obtained knitted fabric had a uniform surface knitted surface and was of excellent quality without a defect called "Hikemura".

Example 11 2000 g of polytetramethylene ether glycol having a molecular weight of 2,000 and 400 g of diphenylmethane diisocyanate were placed in a stirred vessel sealed with nitrogen and reacted at 90 ° C. to obtain a prepolymer. Next, 699 g of this prepolymer was dissolved in 1288 g of dimethylacetamide, and 11 g of ethylenediamine as a chain extender and 1.6 g of diethylamine as a terminal blocking agent were added so that the molar ratio to the prepolymer was 1.05. The mixture was stirred and reacted at ℃ to obtain a polyurethane solution.

When the number average molecular weight of the polyurethane contained in the obtained polyurethane solution was measured by GPC method,
It was about 38,000 in terms of polystyrene.

The polyurethane solution is extruded from a spinneret and heated in a spinning cylinder so that the residual solvent on the surface becomes substantially 0% by the time the formed yarn reaches the first feed roll. Gas temperature (440 ° C), air volume,
The temperature of the spinning cylinder (230 ° C) is adjusted and the winding speed is 651m
/ Min. The convergence of the yarn was performed by a guide provided between the first feed roll and the second feed roll. The resulting multifilament has a fineness of 156 dtex,
Three yarns having five single yarns were converged. The obtained yarn was of excellent quality with small yarn spots.

Around the obtained multifilament elastic yarn, using a commercially available covering machine, using a wooly nylon 6 (78 decitex-24f) as an inelastic yarn, a draft of 3.5 times was applied. At 500 T / M to obtain a single-coated elastic yarn.

Using the obtained single-coated elastic yarn, a circular knitted fabric was knitted using a commercially available circular knitting machine. The obtained knitted fabric had a uniform surface knitted surface and was of excellent quality without a defect called "Hikemura".

Comparative Example 1 Example 1 was repeated except that a convergence guide was provided between the exit of the spinning cylinder and the first feed roll to converge the yarn before the solvent on the yarn surface was substantially completely removed. The same conditions were used.

Using a commercially available covering machine, nylon 6 (8 dtex-5f) was used as a non-elastic yarn, and a 3.2-fold draft was drawn around the obtained multifilament elastic yarn. The number of twists was 2900 T / M, and the number of twists of the upper yarn was 2465 T / M, and double winding was performed to obtain a double-coated elastic yarn.

Using the obtained double-coated elastic yarn, a circular knitted fabric was knitted using a commercially available stocking knitting machine. The obtained knitted fabric had a non-uniform surface knitted surface, and was of poor quality having many defects called "hikemura".

[0125]

According to the present invention, when used in pantyhose applications, it is possible to obtain a product having a uniform knitted surface and excellent quality.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view schematically showing one example of a multifilament elastic yarn used in the present invention.

FIG. 2 is a schematic sectional view schematically showing another example of the multifilament elastic yarn used in the present invention.

FIG. 3 is a schematic view showing an example of a process for producing a multifilament elastic yarn used in the present invention.

FIG. 4 is a schematic view showing an example of a covering machine used in the present invention.

[Explanation of symbols]

 11: Spinneret 12: First feed roll 13: Guide 14: Oil applying roll 15: Second feed roll 16: Winding device F: Yarn 21: Single yarn 22: Yarn 31: Elastic wound yarn body 32: First 1 roller 33: second roller 34: spindle 35: spindle 36: third roller 37: winding roller 38: package

Claims (3)

[Claims] 1. A multifilament elastic yarn comprising at least two yarns each composed of at least one single yarn, wherein the multifilament elastic yarns are converged without adhering or sticking. Knitted fabric. 2. The knitted fabric according to claim 1, wherein the elastic yarn is a polyurethane elastic yarn or a polyurethane urea elastic yarn. 3. The knitted fabric according to claim 1, wherein the number of the multifilament elastic yarns is 2 or more and 20 or less.