JP4334320B2 - Package made of composite fiber for high-speed false twisting and manufacturing method thereof - Google Patents

Description

The present invention relates to a package comprising a polytrimethylene terephthalate composite fiber that is highly stable over time and a method for producing the same. More specifically, a polytrimethylene terephthalate-based semi-stretched composite fiber obtained by a direct spinning drawing method, which is suitable for maintaining high-speed false twisting stability even after a high temperature and long storage period. The present invention relates to a package made of fibers and a production method for producing the package stably industrially.

In recent years, a stretch knitted fabric imparted with stretch performance among knitted fabrics has been strongly demanded from the feeling of wearing. In order to satisfy such a demand, for example, a large number of knitted fabrics that are given stretch properties by blending polyurethane fibers are used.
However, polyurethane fibers are difficult to be dyed with polyester dyes, so that there are problems that the dyeing process becomes complicated, and that the fibers become brittle and deteriorate in performance when used for a long period of time.
In order to avoid such drawbacks, application of polyester fiber crimped yarn instead of polyurethane fiber has been studied.
In recent years, a PTT crimped yarn has been proposed, focusing on the stretch recovery property of polytrimethylene terephthalate (hereinafter referred to as PTT).
In particular, many latent crimped fibers have been proposed in which two types of polymers are bonded side-by-side or eccentrically to develop crimps after heat treatment.

As prior arts related thereto, prior patent documents 1 to 5 are known.
In these prior patents, a side-by-side type bicomponent composite fiber using PTT as at least one component, or PTT having different intrinsic viscosities for both components, and an eccentric sheath-core type composite fiber (hereinafter referred to as an “external sheath core type composite fiber”) Including both, it is called a PTT-based composite fiber). This PTT-based composite fiber is characterized by a soft texture and good crimp expression. These prior arts describe that they have stretchability and stretch recovery, and can be applied to various stretch knitted fabrics or bulky knitted fabrics by utilizing these properties.
Patent Documents 2 and 3 propose a so-called direct spinning and stretching method in which spinning and stretching are continuously performed in producing these PTT composite fibers.
It is disclosed that the PTT-based composite fiber disclosed by the direct spinning drawing method preferably has a breaking elongation of the drawn yarn as low as 45% or less as much as possible for the purpose of enhancing the expression of crimp. (Patent Document 2)

Patent Document 3 discloses that the breaking elongation of a PTT composite fiber is 35% or less and the extreme stress of the dry heat shrinkage stress is 0.25 cN / dtex or more, thereby increasing the expression of crimp under a load. It is disclosed.
However, in the direct spinning drawing method, if the elongation at break of the PTT-based composite fiber is lowered for the purpose of improving crimpability, the elastic recovery property specific to PTT is high, so that the yarn in the package shrinks during winding, There is a problem that the winding form becomes defective or it becomes difficult to take out from the winder due to tightening.
On the other hand, for the purpose of making up for the weakness of the crimp developing power of the PTT-based composite fiber, false twisting may be applied to the fiber.
In Patent Document 4, false-stretched yarn is applied to an unstretched yarn obtained by winding an eccentric sheath-core type composite fiber having PTT copolymerized with a trifunctional component capable of three-dimensional crosslinking as one component. A proposal to reveal the crimp is disclosed.
However, the undrawn yarn obtained in the publication has a problem that the package shape is deformed by storage at a high temperature for a long time, the yarn breakage frequently occurs during false twisting, and the obtained false twisted yarn is also a crosslinking component. Due to the influence of the above, the breaking elongation was as low as 25% or less, and there was a problem that yarn breakage occurred frequently.

Patent Document 5 discloses false twisting of a PTT composite fiber having a heat shrinkage stress value of 0.25 cN / dtex or more.
However, the PTT composite fiber used in the publication also has a problem that the high-temperature false twisting processability deteriorates due to the high heat shrinkage stress that causes the package to be deformed by long-term storage at a high temperature.
Particularly in recent years, with the globalization of production bases, for example, a method of transporting false twisting raw yarns manufactured in Japan to Southeast Asian countries and performing false twisting on suitable land has been implemented. In this case, the false twisting yarn is exposed to a high temperature of about 50 ° C. for a long time during transportation.
A package made of a PTT-based composite fiber by a conventional known direct spinning drawing method such as Prior Patent Documents 2 and 3 and an unstretched PTT-based composite fiber wound at a high speed has a glass transition temperature of PTT of about 40 ° C. For this reason, at such high temperatures, there are problems such as winding of the package and deformation of the shape, making it impossible to use the package after transportation.
Accordingly, there has been a strong expectation for the creation of a package made of a PTT-based composite fiber that is free from package tightening and shape deformation after high-temperature storage, has good high-speed false twisting workability, and has excellent temporal stability.

Japanese Patent Publication No. 43-019108 JP 2001-131837 A JP 2001-055634 A JP 2000-256918 A JP 2002-327341 A

An object of the present invention is to eliminate yarn breakage at the time of high-speed false twisting after aging, which is a problem of a package made of a conventional PTT composite fiber.
An object of the present invention is a package made of a PTT composite fiber obtained by a direct spinning drawing method of a PTT composite fiber, which has good high-speed stretch false twisting stability even after aging at high temperatures, and is stable over time. It is providing the package which consists of a PTT type | system | group composite fiber excellent in the surface, and its stable manufacturing method.

As a result of diligent investigations to solve the above problems, the present inventors have specified the heat shrink characteristics of the physical properties of the PTT composite fibers constituting the package in the production of a package made of PTT composite fibers by the direct spinning drawing method. As a result, the present inventors have found that the above problems can be solved, and have completed the present invention.
That is, the present invention is as follows.
(1) A polytrimethylene terephthalate system comprising a single yarn group in which two polyester components are combined in a side-by-side type or an eccentric sheath core type, and at least one component constituting the single yarn is polytrimethylene terephthalate A package comprising a composite fiber having a winding amount of 2 kg or more, wherein the package is produced by a direct spinning drawing method that simultaneously satisfies the following requirements (A) to (D) : ), A package made of polytrimethylene terephthalate composite fiber, which simultaneously satisfies the above requirement.
(A) Elongation at break is 50-80%
(B) The onset temperature of dry heat shrinkage stress is 50 to 90 ° C
(C) Extreme temperature of dry heat shrinkage stress is 160-210 ° C
(D) Extreme stress value measured by dry heat shrinkage stress is 0.02 to 0.10 cN / dtex
(E) Boiling water shrinkage rate is 10% or less (f) The bulge rate after the package is dry-heat treated at 50 ± 2 ° C. for 1 week is 15% or less (A) The content ratio of mineral oil or fatty acid ester is 0-30 After applying a finishing agent composed of 60% to 95 % by weight and a polyether component of 60% by weight , after spinning at a spinning speed of 2500 to 3000 m / min without winding once, (B) breaking elongation to 50 to 80% After stretching , heat treatment at 70 to 120 ° C.
(C) The ratio of the winding speed to the final roll speed is 0.95 to 1.10,
(D) Winding is performed at a winding speed of 4500 m / min or less.
( 2 ) The package comprising the polytrimethylene terephthalate composite fiber according to ( 1 ), wherein the two polyester components constituting the single yarn are both polytrimethylene terephthalate.

( 3 ) The package comprising the polytrimethylene terephthalate composite fiber according to ( 1 ) or ( 2 ), wherein a ratio of a winding speed to a final roll speed is 0.98 to 1.05.
( 4 ) The package comprising the polytrimethylene terephthalate composite fiber according to any one of ( 1 ) to ( 3 ), wherein winding is performed at a winding speed of 3500 m / min or less.

According to the present invention, there is provided a package consisting of PTT composite fibers obtained by a direct spinning drawing method of the PTT composite fibers, small changes over time, it is excellent in a high speed draw texturing processing stability, from the PTT composite fibers And a stable manufacturing method thereof.

The present invention will be specifically described below.
In the present invention, a composite fiber composed of a single yarn group in which two polyester components are combined in a side-by-side type or an eccentric sheath-core type, and at least one component constituting the single yarn is PTT, The package is made of a PTT-based conjugate fiber made of other polyester.
That is, a combination of PTT and another polyester, or a combination of PTTs is targeted.
At least one of the single yarns constituting the package made of the PTT composite fiber in the present invention is a PTT homopolymer or a copolymerized polytrimethylene terephthalate containing 10 mol% or less of other ester repeating units.

Typical examples of the copolymer component include the following.
Acidic components include aromatic dicarboxylic acids typified by isophthalic acid and 5-sodiumsulfoisophthalic acid, aliphatic dicarboxylic acids typified by adipic acid and itaconic acid, and the like. Examples of the glycol component include ethylene glycol, butylene glycol, polyethylene glycol, and the like. Examples thereof also include hydroxycarboxylic acids such as hydroxybenzoic acid. A plurality of these may be copolymerized.
As other polyester components of the single yarn constituting the PTT-based composite fiber, in addition to PTT, polyethylene terephthalate (hereinafter referred to as PET), polybutylene terephthalate (hereinafter referred to as PBT), or a third component is co-used with these. A polymerized one is used.

Typical examples of the copolymer component include the following.
Examples of the third component include aromatic dicarboxylic acids typified by isophthalic acid and 5-sodium sulfoisophthalic acid, aliphatic dicarboxylic acids typified by adipic acid and itaconic acid, and the like as acidic components. Examples of the glycol component include ethylene glycol, butylene glycol, polyethylene glycol, and the like. Examples thereof also include hydroxycarboxylic acids such as hydroxybenzoic acid. A plurality of these may be copolymerized.
The average intrinsic viscosity of the PTT composite fiber in the present invention is preferably in the range of 0.7 to 1.2 dl / g. When the intrinsic viscosity is less than 0.7 dl / g, the strength of the resulting composite fiber is low, the mechanical strength of the fabric is lowered, and the use for sports applications that require strength is restricted. When the intrinsic viscosity exceeds 1.2 dl / g, yarn breakage occurs in the production stage of the composite fiber, and stable production becomes difficult. A preferable intrinsic viscosity is 0.8 to 1.2 dl / g.

The manufacturing method of the PTT polymer used for this invention may be a well-known thing. A one-stage method in which the degree of polymerization corresponding to a predetermined intrinsic viscosity is obtained only by melt polymerization, or the degree of polymerization is increased by melt polymerization up to a certain intrinsic viscosity, and then the degree of polymerization corresponding to a predetermined intrinsic viscosity is obtained by solid phase polymerization. It is a two-stage method to raise. A two-stage method combining the latter solid phase polymerization is preferred for the purpose of reducing the content of the cyclic dimer. When the degree of polymerization is set to a predetermined intrinsic viscosity by the one-stage method, it is desirable to reduce the cyclic dimer by an extraction process or the like before supplying to the spinning.
The PTT polymer used in the present invention preferably has a trimethylene terephthalate cyclic dimer content of 2.7% by weight or less. More preferably, the content of trimethylene terephthalate cyclic dimer is less than 1.5% by weight.
In the present invention, it is more preferable that both components constituting the single yarn are PTT. When both of the components are PTT, an excellent stretch back property can be expressed. Moreover, it is more preferable that the intrinsic viscosity difference of both components at that time is 0.05 to 0.9 dl / g and the average intrinsic viscosity is 0.8 to 1.2 dl / g.

In the present invention, it is preferable that the ratio of the high viscosity component and the low viscosity component is 40/60 to 70/30 as the blending ratio of the two polyesters having different intrinsic viscosities in the single yarn cross section. When the ratio of the high viscosity component is less than 40%, the yarn strength is less than 2.0 cN / dtex, and the tear strength of the fabric becomes insufficient. On the other hand, if the ratio of the high viscosity component is larger than 70%, the crimping performance is lowered. A more preferable blending ratio is 45/55 to 65/35.
In the present invention, in a composite fiber composed of a single yarn group in which two polyester components are bonded in a side-by-side type, it is preferable that the curvature r (μm) of the bonding interface of the single yarn cross section is less than 10d ^0.5 . Here, d indicates single yarn dtex. In the present invention, it is preferred that the curvature r is 4~9d ^0.5.
The package made of the PTT composite fiber of the present invention needs to have a breaking elongation of 45 to 90%. If the elongation at break is less than 45%, the bulge ratio of the package shape will be 15% or more if maintained at a high temperature of 50 ° C or higher for one week or longer, and when the PTT composite fiber is unwound from the package during high-speed false twisting. The yarn breakage frequently occurs, and stable false twisting becomes difficult. When the elongation at break exceeds 90%, shading on the false twisted yarn occurs. A preferable elongation at break is 50 to 80%.

The elongation at break specified in the present invention corresponds to a semi-drawn yarn in a known PET fiber or a PET composite fiber in which both components are PET, and the resulting fiber has dyeing spots, that is, Thick & Thin tone dyeing abnormalities. It was common knowledge in the industry to arise. The semi-drawn yarn having dyed spots has a problem that even if false twisting is applied, the dyed spots remain and the leveling property is poor. In the present invention, contrary to such common sense, it has been found that if the PTT-based composite fiber is in a specific breaking elongation range, Thick & Thin tone dye spots can be unexpectedly avoided.
The preferable breaking elongation of the present invention is 47 to 80%. More preferably, it is 50 to 75%.
The package made of the PTT composite fiber of the present invention needs to have an onset temperature of 50 to 90 ° C. for the dry heat shrinkage stress of the composite fiber . FIG. 1 shows a schematic diagram of a shrinkage stress curve obtained in dry heat shrinkage stress measurement.
The onset temperature of the dry heat shrinkage stress is a temperature at which the base line (iii) is drawn on the dry heat shrinkage stress measurement chart as shown in FIG. In FIG. 1, a dry heat shrinkage stress curve (i) is an example of a PTT composite fiber constituting the package of the present invention, and a dry heat shrinkage stress curve (ii) is an example of a PTT composite fiber constituting a conventional package. It is.

In the present invention, by setting the onset temperature of dry heat shrinkage stress within this range, there is no change in package shape even at high temperatures, and stable high-speed false twisting processability is achieved. When the onset temperature is less than 50 ° C., package deformation occurs during high temperature storage. When the expression start temperature exceeds 90 ° C., the crimp expression of the false twisted yarn is lowered. A preferable range of the expression start temperature is 55 to 80 ° C.
The PTT composite fiber constituting the package of the present invention needs to have an extreme temperature of dry heat shrinkage stress of 160 to 210 ° C. The extreme temperature of dry heat shrinkage stress is about 500 false twisting speed.
This is an important requirement that affects the stability of false twisting when carried out at a high speed of m / min or higher. When the extreme temperature of the dry heat shrinkage stress is less than 160 ° C, there are many yarn breaks during high-speed false twisting workability, and stable processing becomes difficult, and when it exceeds 210 ° C, the melting temperature of PTT is close to 230 ° C. , Processing may become unstable. A preferable extreme temperature is 165 to 200 ° C.

The PTT composite fiber constituting the package of the present invention is required to have an extreme stress value of 0.01 to 0.15 cN / dtex by dry heat shrinkage stress measurement. If extreme stress value exceeds 0.15 cN / dtex, when storing the package at a high temperature, resulting the tightening package consisting of PTT composite fibers with time shrinks, solutions woman tension during false twisting Fluctuations, and it becomes difficult to generate dyeing spots and to perform stable false twisting. When the extreme stress value is less than 0.01 cN / dtex, it is difficult to stably wind the package made of the PTT composite fiber. A preferable extreme stress value is 0.03 to 0.10 cN / dtex.
The PTT composite fiber constituting the present invention preferably has a crimp expansion / contraction elongation rate of 20% or less, which is manifested before the boiling water treatment of the composite fiber . If the expansion / contraction elongation ratio of the actual crimp exceeds 20%, the looseness of the yarn from the package will be poor at the time of false twisting, or the temporary resistance due to the contact resistance with the guides of the false twisting machine Thread breakage and fluff are generated during twisting, making industrially stable false twisting difficult. The smaller the actual crimps, the better the false twisting processability. A preferable stretch / extension rate is 10% or less, more preferably 5% or less.

The PTT composite fiber of the present invention needs to be wound into a package shape. The package winding amount is preferably 2 kg or more. Considering the cost of paper tubes and transportation, it is preferably 3 to 15 kg industrially. The wound form of the package preferably has a bulge rate of 15% or less. Further, the package made of the PTT composite fiber of the present invention needs to have a bulge rate of 15% or less even after heat treatment at 50 ° C. ± 2 ° C. for 1 week. Such a stable wound foam is achieved for the first time by satisfying the above breaking elongation and dry heat shrinkage stress characteristics at the same time. When the bulge rate exceeds 15%, not only packaging becomes difficult when the package is transported, but also the unraveling property of the PTT fiber becomes poor from the package during high-speed false twisting, and yarn breakage and fluffing occur. The package made of the PTT composite fiber of the present invention is also characterized by maintaining the initial thermal stress characteristics even after maintaining a high temperature at 50 ± 2 ° C. for about 1 week.

That is, the main feature is that the processing stability of the false twisted yarn obtained before and after the change with time, the dyeing difference of the processed yarn, and the crimping performance hardly change.
The fact that the quality of the processed yarn does not change due to changes with time is extremely important in industrial handling.
The fineness and single yarn fineness of the PTT composite fiber of the present invention are not particularly limited, but a fineness of 20 to 300 dtex and a single yarn fineness of 0.5 to 20 dtex are used.
The single yarn cross-sectional shape is not particularly limited, and may be a round, Y, W-shaped atypical cross-section, a hollow cross-sectional shape, or the like.
The PTT composite fiber of the present invention has a matting agent such as titanium oxide, a heat stabilizer, an antioxidant, an antistatic agent, an ultraviolet absorber, an antibacterial agent, various pigments, etc. within a range that does not interfere with the effects of the present invention. These additives may be contained or copolymerized.

Hereinafter, the production method of the present invention will be described.
In the manufacturing method of this invention, it is necessary to provide the finishing agent which consists of a composition whose content ratio of mineral oil or fatty acid ester is 0 to 30 weight% as a finishing agent. Mineral oil or fatty acid ester is generally blended with a finish for the purpose of increasing the smoothness of the fiber. In the present invention, it is important to provide a finishing agent having a composition containing the smooth component in a very limited range. When the content ratio of mineral oil or fatty acid ester exceeds 30% by weight, the wound form of the package changes during storage at a high temperature for a long time, and the bulge rate exceeds 10%.
The smaller the content ratio of mineral oil or fatty acid ester, the better. Preferably, it is 0 to 20% by weight, more preferably 0 to 10% by weight, and most preferably 0% by weight.
As such a finish, it is preferable to use a finish having a composition in which, for example, the polyether content is 60% by weight or more. A more preferable composition of the polyether component is a polyether in which ethylene oxide units and propylene oxide units are copolymerized and the molecular weight is 400 to 20000. The content ratio of the polyether in the finish is preferably 60 to 95% by weight or more. A more preferable content ratio is 65 to 85% by weight. In addition to these, the finishing agent may contain a nonionic surfactant, an antistatic agent, a stabilizer and the like.

In the production method of the present invention, the spun composite fiber is subjected to stretching without being wound once. In drawing, it is necessary to draw at a magnification at which the breaking elongation of the resulting PTT-based composite fiber is 45 to 90%. By setting the breaking elongation within this range, a package made of a PTT-based composite fiber having excellent temporal stability is obtained.
In the manufacturing method of this invention, it is necessary to heat-process after extending | stretching and to make the ratio of a final godet roll and a winding speed | rate into 0.95-1.10. If the speed ratio exceeds 1.10%, winding will occur during winding. When the speed ratio is less than 0.95, the winding tension is lowered, and stable winding becomes difficult. A preferred speed ratio is 0.98 to 1.05.

  In the production method of the present invention, it is necessary to wind at a winding speed of 4500 m / min or less. When the winding speed exceeds 4500 m / min, the package after winding contracts with time, and the tension changes during false twisting. A preferable winding speed is 2000 to 3500 m / min, more preferably 2500 to 3300 m / min. In the production method of the present invention, it is preferable to spin at a spinning speed of 1000 to 3500 m / min. When the spinning speed is less than 1000 m / min, light and shade dyed spots are generated on the false twisted yarn. When the spinning speed exceeds 3500 m / min, the elongation at break becomes less than 45%, and the object of the present invention is not achieved. A preferable spinning speed is 1500 to 3000 m / min.

  In the production method of the present invention, it is preferable to melt-spin the two polyester components with an intrinsic viscosity difference of 0.05 to 0.9 dl / g. If the difference in intrinsic viscosity is less than 0.05 dl / g, sufficient stretch-back property and crimp expression cannot be obtained when a false twisted yarn is used. In addition, if the difference in intrinsic viscosity exceeds 0.9 dl / g, even if the spinneret design and discharge conditions are changed, yarn bending and hole contamination during discharge cannot be sufficiently eliminated, and the fineness variation of the PTT-based composite fibers may not be eliminated. It becomes large and is not preferable. A preferable intrinsic viscosity difference is 0.1 to 0.60 dl / g. When both components are PTT, the intrinsic viscosity difference is preferably 0.1 to 0.4 dl / g.

Hereafter, the manufacturing method of the package which consists of a PTT type | system | group composite fiber of this invention is demonstrated in detail.
The production method of the present invention can be produced using a complex spinning facility having a known twin-screw extruder other than the spinneret shown in FIG. FIG. 3 shows a schematic diagram of a spinneret suitable for the production of the present invention. In FIG. 3, (a) is a distribution plate and (b) is a spinneret. A and B polytrimethylene terephthalates having different intrinsic viscosities are supplied from the distribution plate (a) to the spinning nozzle (b). After both merge at the spinning nozzle (b), it is discharged from a discharge hole having an inclination of θ degrees with respect to the vertical direction. The hole diameter of the discharge hole is indicated by D, and the hole length is indicated by L. In the present invention, the ratio of the discharge hole diameter D to the hole length L is preferably 2 or more. The ratio between the discharge hole diameter D and the hole length L is preferably 2 or more in order to stabilize the bonding state of the two components after two polyesters having different compositions or intrinsic viscosities merge. When the ratio between the hole diameter and the hole length is less than 2, the bonding becomes unstable, and fluctuations due to the difference in the melt viscosity of the polymer occur when discharging from the hole, making it difficult to maintain the fineness variation value within the range of the present invention. . The ratio of the discharge hole diameter to the hole length is preferably as large as possible, but is preferably 2 to 8 because it becomes difficult to manufacture the holes. More preferably, it is 2.5-5.

  It is preferable that the discharge hole of the spinneret used in the present invention has an inclination of 10 to 40 degrees with respect to the vertical direction. The inclination angle of the discharge hole with respect to the vertical direction refers to θ (degrees) in FIG. The fact that the holes are inclined with respect to the vertical direction is an important requirement for eliminating yarn bending due to a difference in melt viscosity when discharging two kinds of polyesters having different compositions or intrinsic viscosities. If the discharge hole does not have an inclination, for example, the so-called bending phenomenon in which the filament immediately after discharge bends in the direction of higher intrinsic viscosity as the difference in intrinsic viscosity increases with the combination of PTTs, and stable spinning is performed. It becomes difficult.

  In FIG. 3, it is preferable to supply and discharge a PTT polymer having a high intrinsic viscosity to the A side and another polyester or PTT polymer having a low intrinsic viscosity to the B side. For example, when the intrinsic viscosity difference between PTT polymers is about 0.1 or more, in order to eliminate bending and achieve stable spinning, the discharge holes must be inclined at least 10 degrees or more with respect to the vertical direction. preferable. When expanding the intrinsic viscosity difference, it is preferable to further increase the inclination angle. However, if the inclination angle exceeds 40 degrees, the discharge part becomes elliptical and stable spinning becomes difficult. Also, the holes themselves are difficult to manufacture. The inclination angle is preferably 15 to 35 degrees, more preferably 20 to 30 degrees. In the present invention, this inclination angle is more effective when the ratio of the hole diameter to the hole length is 2 or more. When the ratio of the hole diameter to the hole length is less than 2, it becomes difficult to obtain a stable discharge effect no matter how the inclination angle is adjusted.

  FIG. 4 shows a schematic diagram of a composite spinning facility used in the production method of the present invention. First, PTT pellets, one component of which has been dried with a dryer 1 to a moisture content of 20 ppm or less, are supplied to an extruder 2 set at a temperature of 250 to 280 ° C. and melted. The other component is similarly melted by the dryer 3 and the extruder 4. The molten PTT is then fed through the bends 5 and 6 to the spin head 7 set at 250 to 285 [deg.] C. and measured separately by a gear pump. Thereafter, the two components are combined at the spinneret 9 having a plurality of holes attached to the spin pack 8 and bonded side-by-side, and then extruded as a multifilament 10 into the spinning chamber. The optimum temperature of the extruder and spin head is selected from the above range depending on the intrinsic viscosity and shape of the PTT pellets.

The PTT multifilament 10 extruded into the spinning chamber passes through the non-air blowing region 11 having a length of 50 to 300 mm, and is then cooled and solidified to the room temperature by the cooling air 8 and applied with a finish, and then rotated at a predetermined speed. It is taken up by a take-up godet roll / stretching roll 14, and after being continuously wound with a drawing roll (heated godet roll in this figure) 15 without being wound once, it is composed of a composite fiber having a predetermined fineness by a winder. It is wound up as a package 17.
Before the solidified multifilament 10 comes into contact with the take-up godet roll 14, a finishing agent is applied by a finishing agent applying device 13. As the finishing agent to be applied, an aqueous emulsion type is used. The concentration of the aqueous emulsion of the finishing agent is 10% by weight or more, preferably 15 to 30% by weight. After applying the finishing agent, the fibers may be entangled as necessary. A known interlacer is used for confounding (not shown). The number of entanglements is 1 to 50 / m, preferably 1 to 20 / m.

Two or more pairs of godet rolls are used. For example, in FIG. 4, a pair of pretension rolls may be provided before the take-up godet roll. Between the two pairs of godet rolls, stretching is performed 1.02 to 2 times by varying the peripheral speed of the godet rolls. In stretching, the temperature of the first godet roll is 50 to 90 ° C, preferably 55 to 70 ° C. The stretched yarn is subjected to the necessary heat treatment by the second godet roll. The heat treatment temperature is 60 to 130 ° C, preferably 70 to 120 ° C.
FIG. 5 shows an example in which the number of godet rolls is three pairs. In FIG. 5, the third godet roll may be a heated godet roll or non-heated. In order to maintain the running stability of the package made of the PTT composite fiber, the dry heat shrinkage stress value of the package made of the PTT composite fiber is 0.01 to 0.15 cN / dtex, the third godet roll is 30 to 100 ° C. It is preferable that

In the present invention, the stretching tension is preferably 0.02 to 0.20 cN / dtex. The stretching tension is the tension between the take-up godet roll 14 and the stretching godet roll 15 (same as the heated godet roll in FIG. 5). If the stretching tension is less than 0.02 cN / dtex, stable yarn stretching may be difficult due to large yarn swing during stretching. When the draw tension exceeds 0.20 cN / dtex, the breaking elongation of the PTT composite fiber constituting the package becomes less than 45%, and the object of the present invention may not be achieved. A preferred stretching tension is 0.05 to 0.15 cN / dtex.
The stretching tension can be determined by selecting the peripheral speed ratio between the take-up godet roll and the draw godet roll, that is, the draw ratio, and the temperature of the take-up godet roll.
In the production method of the present invention, for the purpose of improving the detackability of the PTT composite fiber from the package, the winding twill angle is set to 3 degrees depending on each winding diameter from the start to the end of winding of the package. It is preferable that the winding is performed in a range of 10 degrees. The traverse angle can be set by adjusting the winding speed and traverse speed. When the winding twill angle is less than 3 degrees, winding collapse occurs and normal winding is difficult. If the winding twill angle exceeds 10 degrees, the dry heat shrinkage stress of the drawn yarn and the cooling during winding will be too high, and the object of the present invention will not be sufficiently achieved. A preferred twill angle is in the range of 4 to 9 degrees.

In the present invention, it is preferable that the twill angle of the intermediate layer is larger than the inner layer. Here, the inner layer of the package refers to a stacked portion having a winding thickness from the bobbin within about 10 mm. The most preferable example in which the twill angle varies depending on the winding diameter is to lower the twill angle at the start of winding, that is, the inner layer of the package, gradually increase the twill angle as the winding diameter increases, and to make it highest in the middle layer of the package. After that, reaching the outer layer is to reduce the twill angle again. As described above, it is possible to sufficiently reduce both the bulge and the ear height of the package by changing the winding angle depending on the winding diameter.
As a false twisting method for obtaining false twisted yarn using a package made of the PTT composite fiber of the present invention, any method such as a pin type, a friction type, a nip belt type, an air false twist type may be used. The heating heater may be either a contact heater or a non-contact heater.
The false twist number (T1) is preferably 21,000 to 33,000, and more preferably 25,000 to 32,000, as the value of the false twist number coefficient K1 calculated by the following formula. If the value of the false twist coefficient K1 is less than 21,000, the crimped property of the processed yarn is insufficient, and the stretch performance tends to decrease. If it exceeds 33,000, the yarn breakage during false twist tends to increase.
T1 (T / m) = K1 / (fineness of raw yarn: dtex) ^1/2

In false twisting, it is preferable to set the heater temperature so that the yarn temperature is 160 to 200 ° C. In particular, when false twisting is performed at 160 ° C. or higher, which is the dry heat shrinkage stress extreme temperature of the PTT composite fiber of the present invention, a processed yarn having excellent crimp performance is obtained. The fabric obtained by drawing false twisting using the PTT-based composite fibers constituting the package of the present invention provides a knitted fabric that exhibits good quality and a soft texture without defects such as dye stripes and sink marks.
The PTT false twisted yarn obtained by false twisting the PTT composite fiber constituting the package of the present invention can be highly crimped even by heat treatment under a load. Such characteristics are suitable for fabrics having high binding force of the fabric. The PTT false twisted yarn obtained by false twisting the PTT composite fiber constituting the package of the present invention has an extremely high elongation recovery rate of 20 to 40 m / second measured after boiling water treatment, and 30 to 30 of spandex. Has a recovery speed comparable to 50 m / sec. Such a characteristic provides a knitted fabric having excellent stretchability when applied to clothes and quick stretch recovery, that is, excellent movement following ability. Moreover, it can be knitted and woven as it is to obtain a fabric, and a knitted fabric having a good quality free from wrinkles and dyed spots can be obtained.

As the texture of the woven fabric, a plain weave texture, a twill weave texture, a satin weave texture, and various changed textures derived from them can be applied. In the woven fabric, the PTT false twisted yarn of the present invention can be used for only warp, only weft, or both warp. These woven fabrics have a stretch rate of at least 10%, preferably 20% or more, more preferably 25% or more. If the stretch rate is 20% or more, the object of the present invention is effectively manifested because it instantaneously follows local and instantaneous movement displacement when used in sports clothing.
The recovery rate of the woven fabric is preferably 80 to 100%. More preferably, it is 85 to 100%.
In addition, it is a feature of the present invention that the elongation stress when the fabric is stretched is small. For example, if the stress at 20% elongation is 150 cN / cm or less, the feeling of pressure at the time of wearing is small and preferable. More preferably, it is 50-100 cN / cm.

The woven fabric using the PTT false twisted yarn of the present invention is less likely to get tired even if worn for a long time because the wearing pressure at the time of wearing is small. In addition, since it has excellent movement following characteristics, it has a feature that it is difficult to cause creases that occur around the knees and around the hips when used for pants (trousers) and skirts. This makes it extremely suitable for pants, skirts and uniforms.
When used for a knitted fabric, it can be applied to many knitted fabrics represented by warp knitting, flat knitting and the like. Specifically, it is extremely suitable for jerseys, swimsuits, stockings and the like.
A major feature of these products is their ability to follow the movement of the skin sensation comparable to spandex fibers.
When the PTT false twisted yarn of the present invention is used for a knitted fabric, it may remain untwisted or may be entangled or twisted for the purpose of improving convergence.

When the twist is applied, it is employed that the twist is applied in the same direction as the false twist direction or in a different direction. In this case, it is preferable to set the twist coefficient to 5000 or less.
The twist coefficient is expressed by the following formula.
Twist number T (times / m) = twisting coefficient k / (fineness of false twisted yarn; dtex) ^1/2
The PTT false twisted yarn of the present invention may be used alone or in combination with other fibers to exhibit the effects of the present invention. The composite may be used as a long fiber or as a short fiber.
Examples of other fibers to be combined include other polyester fibers, synthetic fibers such as nylon, acrylic, cupra, rayon, acetate, and polyurethane elastic fibers, and natural fibers such as cotton, hemp, silk, and wool. It is not limited to. The composite may be a long fiber or a short fiber.

Or, to make a knitted fabric in which false twisted yarn and other fibers are mixed and mixed, the mixed fiber composite yarn is interlaced mixed with other fibers, drawn false twisted after interlaced mixing, only one of these is false twisted And then interlaced blends, both separately after false twisting interlaced blends, either one can be produced by various blending methods such as interlacing after interlacing, interlaced interlacing, taslan after interlacing, taslan blending, etc. it can. The mixed fiber composite yarn obtained by such a method is preferably provided with entanglement of 10 pieces / m or more, preferably 15 to 50 pieces / m.
The PTT type composite fiber constituting the package of the present invention can be used as it is for a knitted fabric without being subjected to stretch false twisting. Also in this case, the PTT type composite fiber constituting the package of the present invention may be used alone, or may be used in combination with other fibers. An advantage of using it for a knitted fabric without subjecting it to stretching false twisting is that excellent dyeability is obtained.

Hereinafter, the present invention will be described in more detail with reference to examples and the like. Needless to say, the present invention is not limited to the examples.
In addition, the measurement method and measurement conditions of the physical property performed in the Example are demonstrated.
(1) Intrinsic viscosity The intrinsic viscosity [η] is a value determined based on the definition of the following equation.
[Η] = lim (ηr−1) / C
C → 0
Ηr in the definition is a value obtained by dividing the viscosity at 35 ° C. of a diluted solution of a PTT polymer dissolved in an o-chlorophenol solvent having a purity of 98% or more by the viscosity of the solvent measured at the same temperature. Is defined. C is the polymer concentration expressed in g / 100 ml.

(2) Expansion / contraction elongation ratio Vc of actual crimp
The yarn was scraped 10 times with a measuring machine having a circumference of 1.125 m, and left in a constant temperature and humidity chamber defined in JIS-L-1013 for a day and night with no load.
Next, the skein is subjected to the following load and the skein length is measured 1 minute later, and the apparent expansion / contraction elongation rate Vc is measured from the following formula.
Expansion / contraction elongation% = [(L2-L1) / L1] × 100
L1 = 1 × 10 ⁻³ Skein length when cN / dtex load is applied
L2 = 0.18 cN / dtex load at the time of load application (3) Breaking strength, breaking elongation Measured based on JIS-L-1013.

(4) Extreme stress value of dry heat shrinkage stress It was measured using a thermal stress measuring device (trade name; KE-2, manufactured by Kanebo Engineering Co., Ltd.).
A fiber is cut into a length of about 20 cm, both ends of the fiber are tied, a ring is formed, and the measuring instrument is loaded. Measurement is performed under conditions of an initial load of 0.05 cN / dtex and a heating rate of 100 ° C./min, and the temperature change of the thermal stress is written on the chart. The heat shrink stress draws a mountain-shaped curve at high temperatures. The temperature at which the stress curve rises from the baseline was defined as the onset of shrinkage stress. The stress curve draws a peak, and this peak temperature was taken as the extreme temperature. Moreover, the value calculated | required by the following formula from the reading value (cN) of this peak value was made into the extreme stress value.
Extreme stress value (cN / dtex) =
(Reading value of peak value cN) / (dtex × 2) −initial load (cN / dtex)

(5) Bulge Rate The dimensions of the winding width A of the inner layer of the package and the winding width B of the T / 2 portion as shown in FIG. 2 were measured, and the bulge rate was calculated by the following equation.
Bulge rate (%) = [(B−A) / A] × 100
(6) Expansion / contraction elongation ratio when false twisted yarn is loaded The yarn is squeezed 10 times with a measuring machine having a circumference of 1.125 m and subjected to a dry heat of 180 × with a load of 10 × 10 −3 cN / dtex. Dry heat treatment at ± 2 ° C. for 15 minutes. After the treatment, it was left still for a whole day and night in a constant temperature and humidity room defined in JIS-L-1013. Next, the skein is subjected to the following load, the skein length is measured after 1 minute, and the stretch / elongation rate is measured from the following formula.
Expansion and contraction rate% at 3 × 10 ⁻³ cN / dtex load
= [(L4-L3) / L3] x 100
^{However, L3 = 1 × 10- 3 cN} / dtex load applying time of hank length
L4 = 0.18 cN / dtex load with load applied

(7) Elongation recovery speed of false twisted yarn The yarn is scraped 10 times with a measuring machine having a circumference of 1.125 m and heat-treated in boiling water for 30 minutes with no load. About the false twisted yarn after a boiling water process, the following measurements were performed according to JIS-L-1013. The false twisted yarn after boiling water treatment was left unattended for 1 day without load. The false twisted yarn was stopped using a tensile tester in a state where it was extended to a stress of 0.15 cN / dtex, held for 3 minutes, and then cut with scissors just above the lower gripping point. The speed at which the false twisted yarn cut by scissors contracts was determined by a method of photographing using a high-speed video camera (resolution: 1/1000 second). A ruler in millimeters was fixed in parallel with the false twisted yarn at a distance of 10 mm, and the state of recovery of the distal end of the slice was photographed by focusing on the distal end of the cut false twisted yarn. The high-speed video camera was reproduced, the displacement per unit time (mm / millisecond) of the tip of the false twisted yarn section was read, and the recovery speed (m / second) was obtained.

(8) Spinning stability Using a melt spinning-continuous stretching machine equipped with an 8-end spinneret per spindle, two days of melt spinning-continuous stretching were performed for each example.
The number of occurrences of yarn breakage during this period and the occurrence frequency of fluff (a ratio of the number of fluff generation packages) present in the package made of the obtained composite fiber were determined as follows.
◎: No yarn breakage, fluff generation package ratio 5% or less ○: Less than 2 yarn breakage, fluff generation package ratio less than 10% ×: Three or more yarn breakage, fluff generation package ratio 10% or more

(9) False twisting property False twisting was performed under the following conditions.
False twisting machine 33H false twister made by Murata Machinery Co., Ltd.
96 spindles / unit False twisting condition Yarn speed 500 m / min
Number of false twists 3230 T / m
Drawing ratio It set so that the elongation of the processed yarn might be about 40%.
1st feed rate -1%
1st heater temperature 170 ℃
Judgment of processing stability was performed as follows.
◎: Number of false twisted yarns 10 times / day, less than ○ ○; Number of false twisted yarns 20 to 10 times / day × stand ×: Number of false twisted yarns exceeds 20 times / day, stand

(10) Quality of dyed processed yarn After knitting a false twisted yarn, the quality was judged by scouring and dyeing.
A: Very good with no defects such as dyed spots. ○: Good without any defects such as dyed spots. X: Dyed spots, poor (11) Stretch rate and recovery rate of fabrics Fabrics were prepared as follows.
A plain woven fabric using 84 dtex / 24f PTT single fiber (Asahi Kasei “Solo”) untwisted glue yarn for warp and 84 dtex / 24f false twist yarn of each example of the present invention and comparative example for weft. Created.
Warp density 97 / inch Weft density 88 / inch Loom Water jet loom ZW-303 made by Tsudakoma Corporation
Weaving speed 450 rpm

The obtained raw machine was relaxed and scoured at 95 ° C. with a liquid flow relaxer, and then dyed at 120 ° C. with a liquid flow dyeing machine. Next, a series of finishing and width setting heat setting was performed at 170 ° C. The density of the fabric after finishing was as follows.
Warp density 160 / inch Weft density 93 / inch Using the obtained fabric, the stretch rate and the recovery rate were evaluated by the following methods.
Using a tensile tester manufactured by Shimadzu Corporation, elongation under stress of 2.94 N / cm when the sample was stretched in the weft direction at a grip width of 2 cm, a grip interval of 10 cm, and a tensile speed of 10 cm / min. (%) Was taken as the stretch rate. Then, after shrinking again to the grip interval of 10 cm at the same speed, a stress-strain curve is drawn again, and the elongation until the stress is expressed is defined as the residual elongation (A). The recovery rate was calculated by the following formula.
Recovery rate = [(10−A) / 10] × 100%
(12) Comprehensive evaluation ◎: Spinning stability, false twisting stability, and processed yarn quality are all very good ○: Spinning stability, false twisting stability, processed yarn quality are all good ×: Spinning stability, false twisting stability , Either of the processed yarn quality is defective

[Examples 1-4, Comparative Examples 1-2]
In this example, the effect of the breaking elongation of the PTT composite fiber constituting the package will be described.
As shown in Table 1, PTT having an intrinsic viscosity [η] of 1.26 containing 0.4% by weight of titanium oxide as shown in Table 1, and an intrinsic viscosity [η] containing 0.4% by weight of titanium oxide as the other component. A package composed of 93 dtex / 36 filament PTT composite fibers was produced using 0.92 PTT pellets using a spinning machine as shown in FIG. 5 and a winder having three pairs of godet rolls.
The speed ratio between the first godet roll and the second godet roll, that is, the draw ratio was varied as shown in Table 1 to obtain a package made of composite fibers. Table 1 shows the physical properties of the obtained composite fiber and false twisted yarn.

The spinning conditions in this example are as follows.
(Spinning conditions)
Pellet drying temperature and moisture content reached 110 ° C, 15 ppm
Extruder temperature A-axis 255 ° C
B axis 250 ℃
Spin head temperature 265 ° C
Spinneret hole diameter 0.35mmΦ
Hole length 1.05mm
Cooling air condition Temperature 22 ℃, relative humidity 90%
Speed 0.5m / sec
Non-blowing area 125 mm
Finishing agent Fatty acid ester Not included
Polyether 85wt%
Nonionic surfactant 10wt%
Antistatic agent 5wt%
Concentration of aqueous emulsion consisting of 10% by weight
Distance from spinneret to finisher application nozzle
90 cm
Spinning tension 0.08cN / dtex

(Winding condition)
First godet roll speed 2500m / min
Temperature 55 ° C
Second godet roll temperature 80 ℃
Speed Set to the magnification at which the breaking elongation becomes the value shown in Table 3. Third godet roll temperature 60 ° C
Winder Teijin Seiki Co., Ltd. AW-909
Both bobbin shaft and contact roll shaft
Is self-driven Winding speed Table 1 shows winding angle
Winding thickness 0 mm to 5 mm 3.5 degrees
5 mm to 70 mm 6.5 degrees
70 mm to 110 mm 4.0 degrees Winding tension 0.05 cN / dtex
Package temperature during winding: 25 ° C
Winding amount 5.8kg
The package made of the obtained PTT composite fiber was held in a room whose temperature was adjusted to 50 ± 2 ° C. for 1 week, and then false twisting was performed.
As is apparent from Table 1, when the breaking elongation of the composite fiber is within the range of the present invention, the false twisted yarn and the fabric obtained have excellent stretchability and stretchback properties. Had dyed grade.
As shown in Comparative Examples 1 and 2, if the elongation at break is outside the scope of the present invention, yarn breakage during spinning often occurs, the package is deformed due to change over time, and yarn breakage occurs during false twisting. Production was difficult.

[Examples 5-6, Comparative Examples 3-4]
In this embodiment, the effect of the winding speed ratio on the final roll speed, which is the second invention requirement of the present invention, will be described.
In the combination of Example 2, the ratio of the winding speed to the final roll speed was varied as shown in Table 2 to obtain a package with a winding amount of 5.8 kg. The obtained package was kept in a room whose temperature was adjusted to 50 ± 2 ° C. for 1 week, and then false twisting was performed. Table 2 shows the physical properties of the obtained composite fiber and false twisted yarn.
As is apparent from Table 2, when the winding condition is within the range of the present invention, the wound form of the package was good and the high-speed false twisting was stable.
The obtained false twisted yarn and fabric had excellent stretch properties, stretch back properties, and dyed quality. As shown in Comparative Examples 3 and 4, if the winding speed ratio is outside of the present invention, stable spinning is difficult, or the package is deformed due to changes over time, and yarn breakage occurs during false twisting. Production was difficult.

[Example 7, Comparative Example 5]
In this example, the effect of the composition of the finish that is a requirement of the production method of the present invention will be described.
In Example 2, the composition of the finishing agent was varied as shown in Table 3 to obtain a package made of PTT composite fibers. Table 3 shows the physical properties of the composite fiber and false twisted yarn constituting the obtained package .
If the composition of the finishing agent was within the range of the present invention, the package stability over time was excellent. As shown in Comparative Example 5, if the composition of the finish was outside the range of the present invention, the package changed with time, and stable false twisting was difficult.

[Examples 8 to 9, Comparative Example 6]
In this example, the effect of the type of polymer used in the production of the composite fiber will be described.
Except for the combinations of the two polymers shown in Table 4, composite fibers were obtained under the spinning and drawing conditions shown in Example 2. Table 4 shows the physical properties of the composite fiber and false twisted yarn constituting the obtained package . As apparent from Table 4, false twisted yarns and fabrics obtained from the composite fibers constituting the package of the present invention in which one component is PTT have good stretch properties, stretch back properties, and dyeing quality. It was.

The package comprising the conjugate fiber of the present invention can be suitably used in the field of woven and knitted fabric having stretch properties.

It is a schematic diagram of the thermal stress curve by dry heat shrinkage stress measurement. It is the schematic which shows the winding form of a package. It is the schematic which shows the discharge hole used when spinning the package which consists of conjugate fiber of this invention. It is the schematic of the spinning-drawing equipment which manufactures the package which consists of conjugate fiber of this invention. It is the schematic of the spinning-drawing equipment which manufactures the package which consists of conjugate fiber of this invention.

Explanation of symbols

1: Polymer chip dryer 2: Extruder 3: Polymer chip dryer 4: Extruder 5: Bend 6: Bend 7: Spin head 8: Spin pack 9: Spinneret 10: Multifilament 11: Non-air blowing area 12: Cooling Wind 13: Finishing agent applicator 14: First godet roll 15: Second godet roll 16: Third godet roll 17: Package made of composite fiber

Claims (4)

From a polytrimethylene terephthalate-based composite fiber comprising a single yarn group in which two polyester components are combined in a side-by-side type or an eccentric sheath-core type, and at least one component constituting the single yarn is polytrimethylene terephthalate A package having a winding amount of 2 kg or more, wherein the package is manufactured by a direct spinning drawing method that simultaneously satisfies the following requirements (A) to (D) : A package made of a polytrimethylene terephthalate composite fiber, wherein the package is made of a polytrimethylene terephthalate composite fiber that satisfies the above requirements.
(A) Elongation at break is 50-80%
(B) The onset temperature of dry heat shrinkage stress is 50 to 90 ° C
(C) Extreme temperature of dry heat shrinkage stress is 160-210 ° C
(D) Extreme stress value measured by dry heat shrinkage stress is 0.02 to 0.10 cN / dtex
(E) Boiling water shrinkage rate is 10% or less (f) The bulge rate after the package is dry-heat treated at 50 ± 2 ° C. for 1 week is 15% or less (A) The content ratio of mineral oil or fatty acid ester is 0-30 After applying a finishing agent composed of 60% to 95 % by weight and a polyether component of 60% by weight , after spinning at a spinning speed of 2500 to 3000 m / min without winding once, (B) breaking elongation to 50 to 80% After stretching , heat treatment at 70 to 120 ° C.
(C) The ratio of the winding speed to the final roll speed is 0.95 to 1.10,
(D) Winding is performed at a winding speed of 4500 m / min or less. The package comprising polytrimethylene terephthalate composite fiber according to claim 1 , wherein the two polyester components constituting the single yarn are both polytrimethylene terephthalate. The package of polytrimethylene terephthalate composite fiber according to claim 1 or 2 , wherein a ratio of a winding speed to a final roll speed is 0.98 to 1.05. The package comprising the polytrimethylene terephthalate composite fiber according to any one of claims 1 to 3 , wherein winding is performed at a winding speed of 3500 m / min or less.

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