JP2003155632A - Method for producing yarn-dyed yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a knit-deknit yarn-dyed yarn having proper crimps and capable of providing a woven or knitted fabric having soft feeling, stretchability and proper bulking feeling in excellent productivity. SOLUTION: This method for producing a knit-deknit yarn-dyed yarn comprises forming a knit by a yarn comprising a polytrimethylene terephthalate fiber, subjecting the obtained knit to a dying treatment, and deknitting the dyed knit. The dyeing treatment is preferably carried out by a package dying machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a knit denit dyed yarn made of polytrimethylene terephthalate fiber.

[0002]

2. Description of the Related Art Polytrimethylene terephthalate fibers have the flexibility of nylon fibers and the mechanical properties of polyester fibers, and are excellent in stretchability (elongation and recovery after elongation). It is a certain fiber, and is preferably used mainly for clothing.

At present, in the field of clothing, woven and knitted fabrics composed of polytrimethylene terephthalate fibers are so-called anti-dyeing, which is dyed and then dyed, which is excellent in soft texture and stretchability. A woven or knitted fabric is obtained. Further, by using polytrimethylene terephthalate fibers crimped by yarn processing such as false twisting, it is possible to obtain a woven or knitted fabric excellent in stretchability and swelling by anti-dying.

However, in the anti-dyeing, there is a problem that it is impossible to obtain a woven or knitted fabric having a high-class feeling and excellent in fashionability, such as changing the color arrangement between the yarns to form a pattern. For this reason, there is an increasing demand for a woven or knitted fabric with so-called dyed yarn, which is formed into a woven or knitted fabric after dyeing with a yarn. However, the soft texture and stretchability originally possessed by the polytrimethylene terephthalate fiber are fully utilized, A dyed yarn suitable for knitting has not been obtained so far.

On the other hand, a dyed yarn obtained by dyeing a polytrimethylene terephthalate fiber crimped by a yarn processing such as false twisting by a usual method has a sufficient crimp elongation rate. In the case of a woven or knitted fabric, only a woven or knitted fabric which is inferior in stretchability and swelling feeling to the woven or knitted fabric obtained by anti-dyeing is obtained. Therefore, there is a demand for a yarn-dyed yarn having a high crimp elongation ratio so that a woven or knitted fabric excellent in stretchability and bulging feeling can be obtained.

[0006] Conventionally, in order to obtain a woven or knitted fabric having a bulging feeling using a yarn-dyed yarn, a yarn that has been subjected to a yarn process for imparting crimps by false twisting or the like is dyed in a cheese-like or a cassette-like form. A method using the yarn-dyed yarn obtained in this way is general.

[0007] However, especially when the crimped yarn has a small fineness, crimp dyeing cannot sufficiently develop the crimp, so that the yarn may be a yarn with less crimp.
Also, in case of case dyeing, when the case is dyed, the case is easily entangled during dyeing and the fineness is small, so the strength of the yarn itself is low, and problems such as thread breakage occur during cone up, making production extremely difficult. was there.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polytrimethylene having a proper crimp, a soft feeling, a stretchability and an appropriate swelling feeling. It is an object of the present invention to provide a method for producing a knit denit dyed yarn made of terephthalate fiber, which has excellent productivity.

[0009]

Means for Solving the Problems The present inventors have completed the present invention as a result of extensive studies on the above problems.

That is, the present invention is as follows.

1. A method for producing a knit denit dyed yarn, which comprises forming a knitted fabric from a yarn made of polytrimethylene terephthalate fiber, dyeing the knitted fabric, and then unknitting the knitted fabric.

2. The method for producing a knit denit dyed yarn according to the above 1, wherein the dyeing treatment is performed by a package dyeing machine.

The present invention will be described in detail below.

In the present invention, the polytrimethylene terephthalate fiber means a polyester fiber having a trimethylene terephthalate unit as a main repeating unit, and the trimethylene terephthalate unit is preferably about 50 mol% or more, more preferably 70 mol% or more. , More preferably 80 mol% or more, and most preferably 90 mol% or more. Therefore, the total amount of the other acid component and / or glycol component as the third component is preferably about 50 mol% or less, more preferably 30 mol% or less, further preferably 20 mol% or less, most preferably 10 mol%. % Of polytrimethylene terephthalate is included.

As a preferable characteristic of the polytrimethylene terephthalate fiber, the strength is preferably 2 to 5 cN / dtex, more preferably 2.5 to 4.5 cN / dte.
x, and more preferably 3 to 4.5 cN / dtex. The elongation is preferably 30 to 60%, more preferably 3
It is 5 to 55%, more preferably 40 to 55%. The elastic modulus is preferably 30 cN / dtex or less, more preferably 10 to 30 cN / dtex, further preferably 12
~ 28 cN / dtex, particularly preferably 15 to 25 cN
/ Dtex. The elastic recovery rate at 10% elongation is preferably 70% or more, more preferably 80% or more, further preferably 90% or more, and most preferably 95% or more.

Polytrimethylene terephthalate is synthesized by combining terephthalic acid or a functional derivative thereof and trimethylene glycol or a functional derivative thereof in the presence of a catalyst under appropriate reaction conditions. In this synthesis process, one or more appropriate third components may be added to obtain a copolyester. Also,
Polytrimethylene terephthalate and polyesters other than polytrimethylene terephthalate such as polyethylene terephthalate and polybutylene terephthalate may be blended with polytrimethylene terephthalate, or composite spinning (sheath core, side-by-side, etc.) may be performed.

Regarding the composite spinning, Japanese Patent Publication No. 43-191
08, JP-A-11-189923, JP-A-2
000-239927, JP 2000-2569.
No. 18, etc., the first component is polytrimethylene terephthalate, and the second component is polytrimethylene terephthalate, polyethylene terephthalate,
Polybutylene terephthalate and other polyesters or nylons may be side-by-side or eccentrically arranged side-by-side type or eccentric sheath core type composite spinning. Among them, polytrimethylene terephthalate and copolymerized polytrimethylene terephthalate may be used. A combination or
A combination of two kinds of polytrimethylene terephthalate having different intrinsic viscosities is preferable, and particularly, JP-A 2000-2
Using two types of polytrimethylene terephthalate having different intrinsic viscosities as exemplified in Japanese Patent No. 39927, the composite spinning is performed in a side-by-side type in which the bonding surface shape is curved so that the low viscosity side wraps the high viscosity side. It is particularly preferable because it has both high stretchability and bulkiness.

As the third component to be added, aliphatic dicarboxylic acids (oxalic acid, adipic acid, etc.), alicyclic dicarboxylic acids (cyclohexanedicarboxylic acid, etc.), aromatic dicarboxylic acids (isophthalic acid, sodium sulfoisophthalic acid, etc.) ), Aliphatic glycols (ethylene glycol, 1, 2
-Propylene glycol, tetramethylene glycol, etc.), alicyclic glycols (cyclohexanedimethanol, etc.), aliphatic glycols containing aromatics (1,4-bis (β-hydroxyethoxy) benzene, etc.), polyether glycols (polyethylene glycol) , Polypropylene glycol, etc.), aliphatic oxycarboxylic acids (ω-oxycaproic acid, etc.), aromatic oxycarboxylic acids (p-oxybenzoic acid, etc.), and the like. Further, a compound having one or three or more ester-forming functional groups (benzoic acid or the like or glycerin or the like) can also be used within a range in which the polymer is substantially linear.

Further, matting agents such as titanium dioxide, stabilizers such as phosphoric acid, ultraviolet absorbers such as hydroxybenzophenone derivatives, crystallization nucleating agents such as talc, slip agents such as aerosil, and anti-hindering agents such as hindered phenol derivatives. An oxidizing agent, a flame retardant, an antistatic agent, a pigment, a fluorescent whitening agent, an infrared absorbing agent, an antifoaming agent, etc. may be contained.

Regarding the spinning of polytrimethylene terephthalate fiber in the present invention, for example, Japanese Patent Application No. 2000-
1500m as described in No. 522304
2 to 3.5 after obtaining an undrawn yarn at a winding speed of about 1 / min
No matter which method is adopted, such as a method of performing double twisting, a direct drawing method in which a spinning-twisting step is directly connected (spin draw method), a high-speed spinning method with a winding speed of 5000 m / min or more (spin take-up method), etc. good.

The form of the fibers may be long fibers or short fibers, and may be uniform or thick in the length direction,
Also in cross section, round, triangular, L-shaped, T-shaped, Y-shaped, W
It may be a polygonal type such as a mold, an eight-leaf type, a flat type, a dogbone type, a multi-leaf type, a hollow type, or an irregular type.

Further, as the form of the yarn, spun yarn such as ring spun yarn, open-end spun yarn, single yarn fineness is 0.
1 to 5.5 dtex multifilament raw yarn (including extra fine yarn), sweet twisted yarn to strong twisted yarn, mixed fiber yarn, false twisted yarn (PO
Y drawn false twisted yarn), air jet processed yarn and the like are exemplified.

The total fineness of the yarn is 10 to 50.
0 dtex is preferable, and more preferably 30 to 300 d.
tex.

The yarn made of polytrimethylene terephthalate fiber may contain other fibers such as natural fibers represented by wool within a range of 30 wt% or less within a range not impairing the object of the present invention. By means of mixed spinning (silospan, silofil, etc.), entangled mixed fibers (different shrinkage mixed yarn with high shrinkage yarn, etc.), intertwisting, compound false twist (elongation difference false twist, etc.), 2 feed air injection processing, etc. You may mix it.

In the manufacturing method of the present invention, first, a knitted fabric is prepared from a yarn made of polytrimethylene terephthalate fiber,
It is characterized in that the knitted fabric is subjected to a dyeing treatment and then unknitted (denit) to obtain a knit-denit dyed yarn made of polytrimethylene terephthalate fiber. By adopting such a method, it is possible to obtain a knit denit yarn-dyed yarn having a fixed knit loop. Therefore, when used in a woven or knitted product, the texture is soft and the stretchability and an appropriate swelling feeling are obtained. Furthermore, since the crimp has a larger crimp than the false twisted yarn, when used for a flat knitted fabric or the like, the crimp can give a peculiar surface feeling of satin finish. In addition,
As long as the knit denit yarn-dyed yarn consisting of the target poly (trimethylene terephthalate) fiber is obtained by knitting, other yarns are used together with the yarn consisting of poly (trimethylene terephthalate) fiber when creating the knitted fabric. It doesn't matter.

The knitting machine for producing the knitted fabric is preferably a single knitting machine, and the gauge is 10 to 42 gauge, more preferably 18 to 38 gauge. When the gauge is in this range, the knit loop is appropriate, and thus an excellent crimp is obtained and yarn breakage hardly occurs.

The diameter of the knitting machine is 5.05.
˜20.32 cm (2 to 8 inches), more preferably 7.62 to 12.7 cm (3 to 5 inches). When the diameter of the shuttle is within this range, yarn breakage hardly occurs at the time of unknitting, and the necessary amount can be knitted in an appropriate time, which is economical.

The stitches at the time of knitting are not particularly limited, and the desired crimp level can be obtained.
It may be arbitrarily adjusted within a range in which unwinding can be performed in the disassembly. Normally, the value of the course / wale of the knitted fabric is 0.6
It may be set within the range of to 1.8. The courses and wales are values measured in accordance with the density measurement of JIS L-1018.

In the present invention, as a dyeing device for dyeing a knitted fabric, a package dyeing machine does not rub the knitted fabrics at the time of dyeing to break a single yarn or the like and facilitates the knitting of the knitted fabric. In addition, the crimp uniformity and the leveling property are also excellent, which is preferable. The dyeing conditions and the like are not particularly limited, and dyeing may be performed according to a conventional method. For example, a doughnut-shaped carrier or a multi-stage carrier is packed at a packing density of 0.05 to 0.6 g / cm ³ , and the flow rate is 2
The dyeing may be carried out at 0 to 100 liters / minute, and a commonly used method of dyeing polyethylene terephthalate fiber with a disperse dye or a fluorescent dye may be adopted.

The dyeing temperature is preferably 90 to 130 ° C., and the time is preferably 15 to 120 minutes. Since the glass transition point of polytrimethylene terephthalate fiber is low, 90 to 12
Even if dyed at a temperature lower than that of the conventional polyethylene terephthalate fiber, such as 0 ° C., excellent color developability can be obtained.

When a dyeing machine of the type which circulates the knitted fabric in the course direction, such as a jet dyeing machine, is used, especially in the case of a knitted fabric made of crimped yarn such as false twisted yarn, the knitting is performed during dyeing. Since the ground is stretched and the crimps are stretched, the crimp elongation rate of the yarn-dyed yarn obtained by unknitting the knitted fabric after dyeing may be poor.

In the case of package dyeing, dyeing unevenness may occur if the shrinkage of the knitted fabric is too large. Therefore, a liquid set in dry heat, wet heat or hot water should be set in advance without applying tension as much as possible. It is preferable to sufficiently suppress the shrinkage of the knitted fabric by, for example, For example, a dry heat set of 80 to 160 ° C. using a hot air dryer, a wet heat set of 50 to 150 ° C. using a steam setter, a knitted fabric such as a stainless steel bath, a paddle dyeing machine and a drum dyeing machine is not constrained, and Examples include liquid setting in hot water at 50 to 140 ° C. using a device that does not run the knitted fabric in the course direction, and the treatment time may be appropriately selected within the range of 5 seconds to 120 minutes.

In the present invention, in order to improve the unwinding property of the knitted fabric at the time of unknitting and the weaving and knitting properties of the dyed yarn, an oiling oil agent or the like which is generally commercially available in a knitted fabric form is added. I don't mind.

The corn winding after denitting may be carried out according to a conventional method, but as the winder, the quick traverse method is preferable, and the winding hardness is 30 to 70 degrees, which gives good unwinding when used for a woven or knitted fabric. Therefore, it is preferable.

The knit-denit dyed yarn produced by the method of the present invention preferably has an elastic recovery rate at 10% elongation of 60% or more, particularly preferably 70% or more and 95% or less. Within this range, a woven or knitted fabric having excellent stretchability can be obtained.

Further, the crimp elongation is preferably 5% or more, more preferably 15 to 500%, further preferably 20 to 300%, particularly preferably 50 to 150.
%. When the crimp extension ratio is within this range, a woven or knitted fabric excellent in stretchability and bulging feeling can be obtained. In addition, the crimp extension ratio referred to here is a JIS-L-1090 stretchability test after dry heat treatment at 90 ° C. for 15 minutes under a load of 2.6 × 10 ⁻⁴ cN / dtex and leaving it for one day. It is measured according to the method (method A).

Particularly, in order to obtain a dyed yarn having a high crimp elongation, it is preferable to use crimped yarn of polytrimethylene terephthalate fiber.

As the crimped yarn, a composite fiber yarn having an actual crimp and / or a latent crimp (a yarn spun into a sheath core, a side-by-side, etc.), a false twisting process, an indenting process, and a knit denitting process. A crimped product is exemplified.

In particular, as the crimped yarn, a false twisted yarn which is easy to obtain a high crimp elongation ratio is preferable. The false twisting may be performed by any method such as a commonly used pin type, friction type, nip belt type, and air twisting type. Further, it may be either one-heater false twist or two-heater false twist. Further, it may be drawn false twist of POY.

The false twist heater temperature can be arbitrarily set within the range where the object of the present invention can be achieved, and in general,
Immediately after the outlet of the first heater, the yarn temperature is 100 ° C or more 20
The temperature is preferably 0 ° C. or lower, more preferably 120
℃ or more and 180 ℃ or less, particularly preferably 130 ℃ or more 17
It is in the range of 0 ° C or lower.

If necessary, the second heater may be heat set to form a two-heater false twisted yarn. The second heater temperature is preferably 100 ° C. or higher and 210 ° C. or lower, and more preferably -30 ° C. or higher and + 50 ° C. or lower with respect to the yarn temperature immediately after the outlet of the first heater. Overfeed rate in the second heater (second overfeed rate)
Is preferably + 3% or more and + 30% or less.

The false twist number T may be in the range usually used for false twisting of polyethylene terephthalate polyester fiber, and is calculated by the following formula. In this case, the value of the coefficient K of the false twist number is preferably in the range of 17600 to 35000, and the preferable false twist number T is determined by the false twist textured yarn.

T (T / m) = K / {Fine Twisted Yarn Fineness (dtex)} ^0.5 Another preferable crimped yarn is a composite fiber having an actual crimp and / or a latent crimp. Among them, two types of polytrimethylene terephthalate with different intrinsic viscosities are used, and when the composite fiber spun into a side-by-side type in which the bonding surface shape is curved so that the low viscosity side wraps the high viscosity side, false twisting is performed. Not only is it possible to obtain a yarn-dyed yarn having a crimp as high as that of the yarn, but there is no residual torque peculiar to the false twisted yarn. Is preferable because it does not occur. Further, since the crimping step can be omitted, the cost can be rationalized.

The polytrimethylene terephthalate fiber used in the present invention may be twisted (additional twisting) for the purpose of improving the unwinding property at the time of unknitting and the handleability of the knit denit yarn-dyed yarn.

The number of twists is preferably 50 to 15
00T / m, more preferably 50 to 300T / m. By performing the additional twisting within the above range, the entanglement of the yarns at the time of unknitting is suppressed, and the yarn breakage in the process of winding the cone is reduced, which is preferable. In particular, when using a crimped yarn that has been subjected to false twisting, it is preferable to perform twisting in the direction opposite to the false twisting direction, since the crimp elongation ratio of the dyed yarn can be increased.

The twisting device is not particularly limited, and an Italian twisting machine, a ring twisting machine, a double twister, etc. can be used.

When the number of twisted yarns is large, a twist prevention set may be performed. In that case, since it is difficult to set the anti-twisting set for the polytrimethylene terephthalate fiber in a tense state, it is preferable to adopt a method of performing the anti-twisting set while relaxing the yarn. For example, there is a method of winding a dummy cushion material made of corrugated cardboard on an inner layer of a cylinder with a brim made of aluminum and then rewinding it to perform twist setting while sufficiently relaxing the yarn.
The winding amount may be such that the winding form does not collapse by setting in winding the thread tube. 0.1cN / dtex is required for the set to work sufficiently.
It is preferable to wind with the following winding tension.

When performing the setting, a device such as a vacuum setter can be usually used. From the viewpoint of sufficient setting effect, expression of crimps, and energy efficiency, the treatment temperature is preferably 60 to 110 ° C., and the treatment time is usually preferably 10 to 60 minutes.

The knit denit dyed yarn obtained by the production method of the present invention can be used in any knitted fabric, woven fabric or the like, and a woven or knitted fabric excellent in stretchability and bulging feeling can be obtained. Also, in the cone winding, since the crimp is stretched and wound to some extent, if the material is woven or knitted and then heat-relaxed at 70 to 170 ° C. with a shrink surfer, tumbler, Hoffman finish, etc., the stretchability and bulge will be further enhanced. improves.

The yarn-dyed yarn obtained by the production method of the present invention can be used for woven fabrics (taffeta, twill, satin and various modified structures) and knits (warp knitting, circular knitting, flat knitting, pantyhose knitting, etc.). It can also be used on the surface of a carpet (raised part). In particular, when used as a yarn for flat knitting, there is an advantage that it is easy to set a flat knitted fabric by Hoffman press finishing. Examples of the structure of the knitted fabric include tenjiku, tenjikonoko, rubber, pearl, double-sided, ponchiroma, milan rib, and these modified tissues, which may be appropriately selected according to the purpose of the product.

The dyed yarn obtained by the production method of the present invention includes natural fibers typified by wool, cotton, hemp, silk, etc., regenerated cellulose fibers such as viscose rayon, cupra, etc.
Synthetic fibers such as acetate, polyethylene terephthalate, polyamide, and acrylic, and any other fibers (including raw yarn and yarn-dyed yarn) and yarn composites (ply twist, covering,
False twist, fluid injection processing, fine spinning cross twist, etc.)
You can mix and match.

[0052]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be further described below with reference to examples, but the present invention is not limited to the examples.

The measuring method, the evaluating method and the like are as follows.

(1) Intrinsic viscosity Intrinsic viscosity [η] (dl / g) is a value obtained based on the definition of the following equation.

[0055]

[Equation 1] In the formula, ηr is the viscosity of a diluted solution of polytrimethylene terephthalate yarn or polyethylene terephthalate yarn dissolved in an o-chlorophenol solvent having a purity of 98% or more at 35 ° C. divided by the viscosity of the solvent measured at the same temperature. The value is defined as the relative viscosity. C is g /
Polymer concentration expressed in 100 ml.

(2) Strength and Elongation Property Using Tensilon manufactured by Toyo Baldwin Co., Ltd., a sample length of 20
cm, tensile speed 20 cm / min, tensile strength (cN
/ Dtex), tensile elongation (%), tensile resistance (cN / d
tex) was measured. Also, from the stress-strain curve, 0.8
The elongation (%) under a load of 826 cN / dtex was measured.

(3) Crimping and elongation ratio The fiber was loaded with a load of 2.6 × 10 ^-4 cN / dtex, and the dry heat was 90 ° C. in a perfect oven manufactured by Tabai.
* After 15 minutes of treatment and left for one day, JIS-L-
1090 Measured according to the elasticity test method (method A).

(4) Elastic recovery rate Fiber was 0.0294 cN / at a chuck distance of 20 cm.
The sample was attached to a tensile tester by applying an initial load of dtex, elongated at a tensile rate of 20 cm / min and an elongation rate of 20%, and allowed to stand for 1 minute. After that, it is contracted again at the same speed to draw a stress-strain curve. The elongation when the stress becomes 0.0294 cN / dtex during contraction is defined as the residual elongation (A).

The elastic recovery rate at 20% elongation was determined according to the following formula.

Elastic recovery rate at 20% elongation (%) = [(20-
A) / 20] × 100 Further, the elastic recovery rate at 10% elongation was the same as above with the stress for reading the initial load and residual elongation being 0.08826 cN / dtex and the elongation rate being 10%. Calculated according to the formula.

Elastic recovery rate at 10% elongation (%) = [(10-
A) / 10] × 100 (5) Stretchability of the flat knitted fabric It was measured according to the elongation elastic modulus measuring method (method A: constant elongation method) of JIS-L-1018.

Using a constant speed tensile tester with a self-recording device, 10c
Initial load of 2.942 using a test piece of m width x 15 cm length
After applying cN, grip width 2.5 cm, grip distance 1
It is stretched at 0 cm at a speed of 10 cm / min until the stretch ratio reaches 100%, and left for 1 minute. After that, it is contracted again at the same speed, a stress-strain curve is drawn, and the residual elongation when the stress becomes the same as the initial load during contraction is L (mm),
The recovery rate was calculated according to the following formula.

Recovery rate (%) = [(100−L) / 100] × 100 From the recovery rate of the obtained flat knitted fabric, stretchability was ranked according to the following criteria.

⊚: Recovery rate exceeds 90%.

◯: Recovery rate of 85% or more and less than 90% Δ: Recovery rate of 80% or more and less than 85% ×: Recovery rate of less than 70% (6) Engaged in research on texture and swelling fibers of a flat knitted fabric A sensory test was performed by touch by 10 inspectors, and the following ranking was performed.

<Texture> ○: Feels soft.

Δ: Feels a little soft.

X: Feels hard.

<Swelling feeling of the flat knitted fabric> ○: There is a bulge.

Δ: There is a slight bulge.

X: There is no bulge.

[Example 1] Using polytrimethylene terephthalate having an intrinsic viscosity [η] of 0.92, the spinning temperature was 265.
Spinning at a spinning speed of 1200 m / min to obtain an undrawn yarn,
Next, a hot roll temperature of 60 ° C., a hot plate temperature of 140 ° C., a draw ratio of 3 times, and a drawing speed of 800 m / min were twisted to obtain 56 dtex / 24 f drawn yarn (original yarn).
The strong elongation of the drawn yarn, the initial tensile resistance and the elastic recovery rate at 20% elongation are 3.3 cN / dtex, 46% and 2%, respectively.
It was 0 cN / dtex and 85%.

The obtained 56 dtex / 24f polytrimethylene terephthalate multifilament raw yarn was made into a cylinder knitting machine (manufactured by Eiko Sangyo Co., Ltd .: Model NCR-B, pot diameter 3.5).
Inch (8.9 cm)), 32 gauge, 0.5 kg of tubular knitted fabric was prepared with a knitted fabric course / wale ratio after knitting of 1.2, and was autoclaved without tension. And wet heat setting was performed at 100 ° C. for 20 minutes.

This knitted fabric was packed and set in a package dyeing machine (manufactured by Hisaka Seisakusho Co., Ltd.) at a packing density of 0.4 g / cm ^{3, and} was set at 60 with Kao Scoreroll FC-250 (1 g / l). Scouring was performed at 10 ° C for 10 minutes.

After scouring, dehydration and washing were carried out to obtain a disperse dye (Dianix Blue AC-manufactured by Dister Co.).
E: 1% omf), a dispersant (manufactured by Meisei Chemical Industry Co., Ltd.,
Disper TL: 0.5 g / liter) was added, and dyeing was further performed at 120 ° C. for 30 minutes in a bath adjusted to pH 5 with acetic acid. After dyeing, deliquoring and washing with water, sodium hydroxide 1
g / l, hydrosulfite 1 g / l,
Reduction and washing was performed at 80 ° C. for 20 minutes with 1 mol / liter of Sunmor RC-700 (manufactured by Nichika Chemical Co., Ltd.). After reduction cleaning, liquid removal and neutralized water cleaning were performed, and 5% omf of a silicone-based softening agent (Lonsize K-22, manufactured by Heiwasha Co., Ltd.) was added, and an oiling treatment was performed at 50 ° C. for 20 minutes.

After dehydration and drying, the dyed tubular knitted fabric was unwound and wound on a cone with a winder manufactured by Ishikawa Seisakusho KK to obtain a yarn-dyed yarn. Table 1 shows the physical properties of the obtained yarn-dyed yarn.

This yarn-dyed yarn was produced by a flat knitting machine (manufactured by Coppo Corporation, 1
2 gages) were aligned to prepare a flat knitted fabric, and steam finishing was performed using a Hoffman press machine (Kobe Electric Industry Co., Ltd., Kobe Press) to obtain a flat knitted fabric. The fabric characteristics of the obtained flat knitted fabric are shown in Table 1.

The obtained yarn-dyed yarn has a high crimp extension ratio of 1
The recovery rate at 0% elongation is also excellent, and the flat knit fabric using this yarn-dyed yarn has a soft texture and a swelling feeling,
It had excellent stretchability, and the surface of the fabric was satin-finished and highly fashionable.

Example 2 56 dtex obtained in Example 1
/ 24f polytrimethylene terephthalate multifilament raw yarn is made by Ishikawa Seisakusho Co., Ltd.
Using VF338, yarn speed 190m / min, false twist number 380
0T / m, false twist direction Z, false twist processing temperature 170 ° C, 1st
False twisting was performed under the conditions of 0.0% feed and 4.1% TU feed.

Using the obtained false twisted yarn, a dyed yarn and a flat knitted fabric were obtained in the same manner as in Example 1. Table 1 shows the physical properties of the resulting yarn-dyed yarn and the flat knitted fabric.

The yarn-dyed yarn obtained had a high crimp elongation, a soft texture of the flat knitted fabric, a swelling feeling, and a good stretchability.

Example 3 Two kinds of polytrimethylene terephthalate having different intrinsic viscosities were extruded in a side-by-side type at a mass ratio of 1: 1 and spinning temperature was 265 ° C. and spinning speed was 1
Undrawn yarn is obtained at 500 m / min, then hot roll temperature 55 ° C., hot plate temperature 140 ° C., drawing speed 40
0 m / min, the draw ratio was set so that the fineness after drawing was 84 dtex, and the yarn was twisted to obtain a raw yarn of a side-by-side type composite multifilament of 84 dtex / 12f.
The intrinsic viscosity of the obtained yarn is [η] = 0.8 on the high viscosity side.
8, [η] = 0.70 on the low viscosity side. The strength and elongation of this raw yarn, the initial tensile resistance and the elastic recovery rate at 20% elongation are 2.6 cN / dtex, 32% and 25 cN /, respectively.
dtex and 82%.

The obtained raw yarn was twisted in the S direction at 120 T / m with an Italy twisting machine.

A tubular knitted fabric was produced in the same manner as in Example 1 except that the gauge of the tubular knitting machine was 28 gauges and the knitted fabric course / wale ratio after knitting was 1.0 using this yarn. Got

The obtained tubular knitted fabric was subjected to 2 at 80 ° C. with a rotary dyeing machine (RD-600) manufactured by Texam Giken Co., Ltd.
The liquid was set in hot water for 0 minutes.

This knitted fabric was scoured, dyed, reduced and washed, oiled, and unknitted in the same manner as in Example 1 to obtain a yarn-dyed yarn. Table 1 shows the physical properties of the obtained yarn-dyed yarn.

Using the obtained yarn-dyed yarn, the number of aligned yarns is 2
A flat knitted fabric was obtained in the same manner as in Example 1 except that the book was changed to a book. The fabric characteristics of the obtained flat knitted fabric are shown in Table 1.

The obtained dyed yarn has a small residual torque,
The crimp elongation rate was high, the recovery rate at 10% elongation was also excellent, and the weft knitted fabric had a soft feeling and swelling feeling, and was excellent in stretchability.

Comparative Example 1 In Example 1, 56 dt
56dtex / 24f polyethylene terephthalate raw yarn (made by Asahi Kasei Corp., strength 3.9 cN / dtex, elongation 35%, initial tensile resistance 9 instead of ex / 24f polytrimethylene terephthalate multifilament raw yarn
7cN / dtex, elastic recovery rate at 20% elongation 25%)
Was used, and a dyed yarn and a flat knit fabric were obtained in the same manner as in Example 1 except that the dyeing temperature was changed to 130 ° C. Table 1 shows the physical properties of the resulting yarn-dyed yarn and the flat knitted fabric.

Since the obtained yarn-dyed yarn was inferior in recovery rate at 10% elongation, the flat knitted fabric using this yarn-dyed yarn was inferior in stretchability and had a hard texture.

[Comparative Example 2] In the same manner as in Example 1, a yarn obtained by subjecting a knitted fabric to wet heat setting and then deniting was used.
Using a soft winder manufactured by Kozu Co., 0.5 in a dyeing tube with a paper tube diameter of 72 mm and a winding density of 0.40 g / cm ³ .
Rolled by kg, set in a cheese dyeing machine (Hisaka Seisakusho Co., Ltd., small cheese dyeing machine), score roll FC manufactured by Kao
-250 (1 g / l) was added, the temperature was raised from room temperature to 60 ° C. at a temperature rising rate of 2 ° C./min at a flow rate of 40 l / min, and scouring was performed at 60 ° C. for 10 minutes.

After scouring, dehydration and water washing were carried out to obtain a disperse dye (Dianix Blue AC-manufactured by Dister Co.).
E) 1% omf, a dispersant (manufactured by Meisei Chemical Industry Co., Ltd., Disper TL) 0.5 g / l were added, and the pH was further adjusted to 5 with acetic acid, followed by dyeing at 120 ° C. for 30 minutes. After dyeing, dehydration and washing with water, sodium hydroxide 1g
/ Liter, hydrosulfite 1 g / liter, Sunmor RC-700 (manufactured by Nichika Chemical Co., Ltd.) 1 g / liter, flow rate 40 liter / min, and temperature rising rate 2 ° C./min 8
The temperature was raised to 0 ° C., and reduction cleaning was performed at 80 ° C. for 20 minutes.

After reduction cleaning, dewatering and neutralization water cleaning were performed to obtain a silicone type softening agent (Lonsize K-22, one company Co., Ltd.).
5% omf was added, and the oiling treatment was performed at 50 ° C. for 20 minutes. After dehydration, drying was performed to obtain a yarn-dyed yarn. Table 1 shows the physical properties of the obtained yarn-dyed yarn.

A flat knit fabric was obtained from the obtained yarn-dyed yarn in the same manner as in Example 1. Table 1 shows the physical properties of the obtained flat knitted fabric.

The yarn-dyed yarn obtained had a low crimp elongation ratio, and the texture of the flat knitted fabric was soft, and the stretchability was good, but it did not have a bulge and the surface of the fabric was flat. It was something.

Example 4 In Example 2, the dyeing machine was changed to a jet dyeing machine, and after scouring at 90 ° C. for 30 minutes, washing with water,
Dyeing yarn was obtained in the same manner as in Example 2 except that dyeing was performed at 120 ° C for 20 minutes, followed by washing with water and drying. Table 1 shows the physical properties of the obtained yarn-dyed yarn.

Since the knitted fabric of the dyed yarn obtained was stretched in the course direction at the time of dyeing, the crimp elongation ratio and the uniformity of crimp were slightly inferior to those of Example 2, and knitting by dyeing was performed. Since the ground was rubbed, thread breakage often occurred during unknitting, and productivity was slightly inferior.

A flat knitted fabric was obtained from the obtained yarn-dyed yarn in the same manner as in Example 1. Table 1 shows the physical properties of the resulting yarn-dyed yarn and the flat knitted fabric.

The obtained flat knitted fabric had a soft feeling and good stretchability, but the surface quality of the fabric was slightly inferior because there were some crimp spots in the yarn length direction.

[0100]

[Table 1]

INDUSTRIAL APPLICABILITY According to the production method of the present invention, a knit denit dyed yarn having an appropriate crimp can be produced with excellent productivity. When used in a woven or knitted fabric, the knit denitted yarn dyed according to the present invention can form a woven or knitted fabric having a soft texture, stretchability and an appropriate swelling feeling.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4H057 AA02 BA08 DA01 DA34 GA07                       GA18                 4L036 MA05 MA24 MA33 PA01 PA03                       PA05 RA04 UA16

Claims (2)

[Claims] 1. A method for producing a knit denit dyed yarn, which comprises forming a knitted fabric from a yarn made of polytrimethylene terephthalate fiber, dyeing the knitted fabric, and then unknitting the knitted fabric. 2. The method for producing a knit denit dyed yarn according to claim 1, wherein the dyeing process is performed by a package dyeing machine.