JP2003089936A - Polyester conjugate uneven yarn having latent crimpable performance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new polyester uneven yarn exhibiting excellent natural feeling, spunized appearance and dry feeling and having good stretch performance. SOLUTION: This polyester conjugate uneven yarn is obtained by blending a polyester uneven yarn containing thick and thin filament parts in the longitudinal direction with a latent crimpable polyester conjugate fiber. The conjugate uneven yarn has the latent crimpable performances in which peak values (Pmax1 and Pmax2 ) each exists in 4-10 cm cycle and in 50-150 cm cycle on a spectrograph obtained by a normal test and the peak value ratio (Pmax1 /Pmax2 ) is 1.2 to 4.0.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester composite fluff that can provide a fabric having an excellent natural feel, a dry feel, a spanize appearance, and a stretch performance.

[0002]

2. Description of the Related Art It has been well known that a non-stretched polyester yarn is incompletely stretched to obtain a fluffy yarn. Naturally, the more the unevenness is emphasized, the more the characteristics such as the texture become stronger, but if the unevenness is emphasized too much, the natural feeling is impaired or the unoriented portion of the low orientation remains. There is a problem that the handling property and the mechanical property are deteriorated due to this.

To solve this problem, Japanese Patent Publication No. 3-77
In Japanese Patent Publication No. 304, there is proposed a fluffy yarn in which the thick portion of the fluffy yarn is in a special dispersed state, and the value of the cycle 50 cm on the spectrograph obtained by the normal test is 1/2 or less of the maximum value as a yarn. ing. Although this fluffy yarn has improved mechanical properties and handleability, its texture is still insufficient depending on the application, and it is desired to develop a fluffy yarn that exhibits a natural feeling, a dry feeling, and a spanized appearance. There is.

On the other hand, in recent years, there has been an increasing demand for comfort of wearing clothes, and it has become common to impart appropriate stretchability to cloth.

For these reasons, it is expected to develop a fluffy yarn excellent in stretchability in addition to the above-mentioned improvement in texture and appearance.

[0006]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above-mentioned conventional technique, and an object thereof is to obtain a fabric exhibiting an excellent natural feeling, a spanized appearance, a dry feeling, and excellent stretchability. The present invention is to provide a novel polyester composite fluff.

[0007]

Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have found that a composite yarn obtained by mixing or twisting at least two types of polyester multifilaments has a yarn length of It has been found that a composite fluffy yarn capable of producing a desired fabric can be obtained by skillfully combining an aggregate structure by using a fluffy yarn containing monofilaments having a fineness in a direction and a latent crimped yarn. Has been completed.

Thus, according to the present invention, "a composite yarn in which a polyester filament yarn (A) containing monofilaments that are thick and thin in the yarn length direction and a latent crimp type polyester conjugate fiber (B) are mixed Therefore, there are peak values (P _max1 , P _max2 ) at a period of 4 to 10 cm and a period of 50 to 150 cm on the spectrograph obtained by the normal test, and the peak value ratio (P _max1 / P _max2 ) is 1 Polyester composite fluff with latent crimp performance, characterized in that it is .2-4.0. "

At this time, the latent crimp type polyester composite fiber (B) has a hot water shrinkage ratio of the polyester filament (A).
When the composite fluff yarn is subjected to heat treatment, the latent crimped polyester conjugate fiber (B) is in the core and the polyester fluff yarn is in the sheath part (5% or more). A) is located, which is preferable.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. The polyester composite fluff having latent crimping performance of the present invention is a composite in which a polyester fluff (A) containing monofilaments having a thickness in the yarn length direction and a latent crimp type polyester conjugate fiber (B) are mixed. It is fluffy yarn.

First, the polyester filament yarn (A) used in the present invention is mainly made of polyethylene terephthalate having ethylene terephthalate as a repeating unit.
If necessary, a small amount of the third component (usually 15 mol% or less, preferably 10 mol% or less, based on all repeating units,
Particularly preferably 5 mol% or less) may be a copolymerized polyethylene terephthalate-based copolyester,
Further, it may contain a matting agent and other additives.
Among them, by alkali reduction treatment, the fiber surface or the inside of the fiber, in the case of containing a fine pore forming agent for forming fine pores or fine grooves, depending on the shape of the pores or grooves, water absorption, It is preferable because various effects such as natural silk-like feeling, sharpness and dry touch can be exhibited.

For example, when the sulfonic acid metal salt represented by the following general formula is contained as the fine pore forming agent,
The dry feeling is improved and the performance similar to cotton can be obtained.

[0013]

[Chemical 2]

In the formula, M and M'are metals, preferably alkaline earth metals, manganese, cobalt and zinc, and M and M'may be the same or different. R is a hydrogen atom or an ester-forming functional group, and n is 1 or 2.

As such a sulfonic acid metal salt, for example, those described in Japanese Patent Publication No. 61-31231 are preferably used, specifically, sodium 3-carbomethoxybenzenesulfonate-5-carboxylate sodium, 3-carboxylate.
Mention may be made of sodium hydroxyethoxycarbonylbenzenesulfonate-5 magnesium carboxylic acid 1/2.

The metal sulfonic acid salt may be added to the polyester at any stage before melt spinning of the polyester. For example, it may be added to the raw material of the polyester or compounded during the synthesis of the polyester. Good. Also,
If the amount of the above compound added is small, the cotton-like feel of the finally obtained polyester fiber will decrease, while if it is large, problems will easily occur during spinning, so 0.5 to 2.5 based on the polyester weight. %, Especially in the range from 0.6 to 1.2% by weight is suitable.

The apparent single fiber fineness of polyester fluff (A) (the average of large and thin fibers in the length direction) and the total fineness as a yarn are not particularly limited, but the single fiber fineness is 1 0.5-5.0 dtex, total fineness of 40-
A range of 170 dtex is suitable.

The cross-sectional shape of the monofilament of the polyester filament yarn (A) is not particularly limited, and a natural spanned appearance can be achieved even with a round cross section.
The triangular cross section is preferable because it can give a dry feeling and a spanized appearance.

The hot water shrinkage of the polyester filament yarn (A) is preferably 10% or less (more preferably 8% or less). That is, since the final set is often carried out at 160 ° C. to 200 ° C. in the usual dyeing and finishing step, the latent crimped polyester composite fiber (B) has a core portion after heat treatment by having such a hot water shrinkage ratio. To
It is easy to obtain a core-sheath structure yarn in which the polyester yarn (A) is arranged in the sheath portion.

Further, the elongation of the polyester filament yarn (A) is preferably 80% or more (more preferably 100 to 150%). By having such elongation,
Even after a force is applied to the core-sheath structure yarn after forming the polyester filament yarn (A) into the core-sheath structure yarn arranged in the sheath portion, stress is unlikely to occur in the sheath portion, and therefore excellent stretch performance is obtained. Is easy to obtain.

The polyester fluff (A) used in the present invention described above can be produced, for example, by the method described below.

That is, the above polyester is heated to a temperature of 28.
An oil agent is applied to a spun yarn that is melted at 0 to 300 ° C., melted and discharged from a spinneret, and cooled and solidified, and a pressure of 0.1 to 0.
After injecting 3 MPa air to give interlace, a semi-drawn yarn (preheating roller take-up speed: 1500 to 2500 m / min, drawing ratio: 1. 1-1.5) and wound on a winder. In particular, it is important to impart interlace, and by appropriately optimizing the conditions for imparting such interlace, an excellent natural feeling, which is one of the objects of the present invention, can be obtained. In addition, if necessary, the obtained semi-drawn yarn is drawn at a drawing speed of 500 to 1400 m.
/ Min, through a preheating roller heated to 80 to 120 ° C and a non-contact heater set to 170 to 240 ° C, relaxation heat treatment or stretching may be performed at a magnification of 0.9 to 1.2 times.

Next, the latently crimped polyester conjugate fiber (B) used in the present invention can develop crimps in boiling water without being subjected to mechanical crimping such as false twisting. It is necessary that the crimp be a curved three-dimensional crimp without buckling or angular portions.

As the latently crimped polyester composite fiber (B), two kinds of components having polybutylene terephthalate, polytrimethylene terephthalate and polyethylene terephthalate as main constituents are composite-spun into a side-by-side type or an eccentric sheath core type. Examples thereof include a composite fiber, or a composite fiber in which polyethylene terephthalate having different intrinsic viscosities is composite-spun into a side-by-side type or an eccentric core-sheath type. Among them, a composite fiber in which polyethylene terephthalate having a different intrinsic viscosity is composite-spun in a side-by-side type is particularly preferred.

The polyethylene terephthalate-based, polytrimethylene terephthalate-based, and polybutylene terephthalate-based polyesters described above may optionally contain a small amount (usually less than 30 mol%) of a copolymerization component. Polymerized acid components include isophthalic acid, diphenyldicarboxylic acid, naphthalene dicarboxylic acid, 5-sodium sulfoisophthalic acid, adipic acid, sebacic acid, and the like, and oxycarboxylic acid components include parahydroxybenzoic acid and the like, and diol. As the component, ethylene glycol other than the glycol component forming the above repeating unit, trimethylene glycol, butylene glycol, further, hexamethylene glycol, neopentyl glycol, bisphenol (ethylene glycol is added to the phenolic hydroxyl group) Side may be one obtained by adding a), and polyethylene glycol, polytetramethylene glycol. Particularly, when isophthalic acid and / or bisphenol A is copolymerized in a polyester having a higher viscosity in an amount of 5 to 25 mol%, preferably 8 to 15 mol%, the crimp expression performance of the composite fiber is further improved. desirable.

The latent crimp type polyester conjugate fiber (B) preferably has a hot water shrinkage ratio of 5% or more (more preferably 7% or more) higher than that of the polyester fluff (A). When the hot water shrinkage is lower than the above value, after the heat treatment, latently crimped polyester conjugate fiber (B)
May not be arranged in the core, and the stretch performance, which is one of the objects of the present invention, may not be obtained.

The elongation of the latently crimped polyester composite fiber (B) is 50% or less (more preferably 30 to 4).
5%) is preferable.

Further, the thermal stress at 160 ° C. of the latently crimped polyester conjugate fiber (B) is preferably larger than that of the polyester fluff (A).
The value of the thermal stress is preferably 0.1 cN / dtex or more (more preferably 0.2 cN / dtex or more). That is, as described above, the final set is often carried out at 160 to 200 ° C. in the usual dyeing and finishing step, and the crimp of the latent crimp type polyester composite fiber (B) is expressed at least at this temperature. This is because it is necessary to improve the feeling of wearing. In order to obtain such physical properties, the drawing temperature, the draw ratio, etc. when drawing the undrawn yarn may be appropriately adjusted. For example, the elongation can be changed by the draw ratio, and the hot water shrinkage can be changed by the set conditions at the time of drawing. Particularly, those having a high hot water shrinkage ratio can be obtained by stretching using a non-contact heater.
Since the thermal stress varies depending on the draw ratio, the heating temperature during drawing, and the spinning speed of the undrawn yarn, 2500 m / min
The following low spinning speed yarns may be drawn at a high draw ratio, or 250
What was spun at 0 to 4500 m / min may be stretched at a low ratio. As such a drawing method, any of a direct drawing with a roller, a spinning drawing utilizing air resistance, and a method of drawing a once wound yarn separately may be used. Further, as another method of changing these physical properties, the polymer may be modified to adjust the amount, and for example, copolymerization with isophthalic acid makes it possible to easily obtain a polymer having a high shrinkage ratio.

The polyester composite fluff having latent crimp performance of the present invention is a composite yarn in which the above polyester fluff (A) and latent crimp type polyester composite fibers (B) are mixed. The compounding method is not particularly limited, but a method in which the fibers are entangled and mixed by passing through an air injection nozzle is preferably exemplified. When performing fiber mixing using an air injection nozzle, as a method for injecting air, there are a method of applying the air in a direction perpendicular to the yarn and a method of applying along the traveling direction of the yarn. According to the former, a product having relatively excellent gloss can be obtained. On the other hand, according to the latter, a product having a relatively soft texture can be obtained. At this time, if the overfeed rate becomes large, a large number of loops are generated, and the weaving property may be deteriorated. Therefore, it is preferable to keep the overfeed rate within 10%. Further, in order to improve the natural feeling, it is also preferable to make a difference in overfeed ratio between the two and to subject at least one to relaxation heat treatment. Further, any method such as a method in which the above two kinds of fibers are aligned on a twisting machine and then twisted, or a method in which they are aligned before winding and wound up and then twisted may be adopted. Further, multifilaments other than the above two types of fibers may be mixed together at the same time as long as the object of the present invention is not impaired.

The weight ratio of the polyester fluff (A) to the latent crimp type polyester conjugate fiber (B) can be freely selected according to the purpose. The polyester fluff (A): latent crimp type polyester conjugate fiber. The weight ratio of (B) is 80: 2
0 to 20:80 (more preferably 75:25 to 50: 5
0) is preferable.

In the polyester composite fluff yarn having latent crimp performance of the present invention, the polyester fluff yarn (A) and the latent crimp type polyester conjugate fiber (B) may each be composed of two or more fibers. Alternatively, as long as the characteristics of the present invention are satisfied, a third yarn can be added to form a composite. For example, metal-plated fibers or fibers mixed with carbon particles can be combined to give conductivity. At this time, it is preferable that the weight ratio of the splicing yarn be within 30 wt% with respect to the entire composite fluff yarn in order to maintain the spanize appearance, natural feeling, dry feeling, and stretch performance.

Next, the spectrograph referred to in the present invention means a Worcester spectrograph developed by Zuelvega of Switzerland, the measurement conditions are normal test, and the measurement speed is 400 m / min. This Worcester spectrograph enables rapid analysis of plaque content, and is particularly useful for knowing the pitch of plaques. For details, see “Mura's Theory and Practice” No. 255 published by The Textile Machinery Society. See page 372.

Examples of spectrographs of the polyester composite fluff yarn of the present invention and the conventional fluff yarn are shown in FIGS. 1 and 2 and will be described in detail with reference to the drawings. Here, FIG. 1 is a spectrograph of a polyester composite fluff obtained in Example 1 according to the present invention described later, while FIG. 2 is a spectrograph of a conventional fluff. That is, in FIG. 1, the mottle period is 50.
Since the spots are dispersed so that the local maximums exist in the long portion of ~ 150cm and the short portion of 4 ~ 10cm, compared to the conventional fluff yarn having no local maximum in the long period region, It is possible to obtain a natural spanize appearance.

In the polyester composite fluff yarn having latent crimping performance of the present invention, the period of 4 to 10 cm (preferably 5) on the spectrograph obtained by the above normal test.
~ 8 cm) and cycle 50-150 cm (preferably 80-)
120 cm) each has a peak value (P _max1 , P _max2 ), and the peak value ratio (P _max1 / P _max2 ) is 1.
It is important to be 2 to 4.0 (preferably 1.5 to 2.0). If there is only one peak value, or the position of the peak value is outside the above range, or if the peak value ratio (P _max1 / P _max2 ) is outside the above range, the thick part is randomly selected. The dispersibility is lowered and the natural feeling is lowered, or the dry feeling and the spanize appearance are lowered.

Further, in the polyester composite fluff yarn having latent crimping performance of the present invention, the ratio of the value P ₂₀ at the period of 20 cm on the spectrograph and the peak value P _max1 (P
_max1 / P ₂₀₎ is 1.5 to 4.0 (more preferably 2.0
It is preferable for it to be in the range of 3.0 to 3.0 because the natural feel, dry feel, spanize appearance and the like are further improved.

The composite fluff yarn having the periodic characteristic on the spectrograph can be easily obtained by using the polyester fluff yarn (A) obtained by the above-mentioned manufacturing method.

The apparent single fiber fineness of polyester composite fluff (average of length and thickness) and total fineness as a yarn are not particularly limited, but the single fiber fineness is 1.5. ~ 5.0 dtex, total fineness 40 ~ 2
A range of 50 dtex is suitable.

The crimp ratio TC of the polyester composite fluff after heat treatment is 1.0 in order to impart stretchability to the fabric.
% Or more (more preferably 2.0% or more) is preferable.

The polyester composite fluff yarn having the latent crimping performance of the present invention described above is usually twisted if necessary and is weaved with a desired design. The obtained cloth is subjected to a dyeing process step and subjected to heat treatment. By such heat treatment, the polyester composite fluff yarn having latent crimp performance of the present invention becomes a core-sheath type structured yarn in which the crimp yarn is arranged in the core portion and the fluff yarn is arranged in the sheath portion. As a result, a fabric having an excellent natural feeling, a spanized appearance, a dry feeling, and excellent stretch performance can be obtained. In addition, in the dyeing process step, it is preferable to carry out an alkali weight reduction treatment, if necessary, because the natural feeling and the dry feeling are further improved.

In the present invention, since the appearance of the spanize, the natural feeling, the dry feeling and the stretchability are intended,
It is not preferable to weave into a complicated weave, and it is preferable to weave into a plain weave or a changed weave, a simple twill weave or a changed weave, a satin weave and the like. Further, the proportion of the composite fluff yarn of the present invention in the cloth does not necessarily have to be 100%, but a higher proportion is preferable in order to obtain excellent spanning appearance, natural feeling, dry feeling, and stretchability. .

[0041]

EXAMPLES Examples and comparative examples of the present invention will be described in detail below, but the present invention is not limited thereto.
Each measurement item in the examples was measured by the following method. <Intrinsic viscosity> Measured with an orthochlorophenol solution at 35 ° C. <U%> Using an Evenestester, the sample was supplied at a detection speed of 100 m / min and twisted at 3000 times / m, and the sample was supplied and measured. <Hot water shrinkage rate (BWS)> According to JIS L1013 measuring method. <Thermal stress (TS)> The thermal stress is measured by using a thermal stress measuring device and a recording device linked to this. The sample is made into a 5 cm ring using a sampling jig. Next, the thermal stress measuring device and the recording device are set to 20 to 300 ° C., and the stress is 0 to 19.6 cN (0 to 20 g.
Prepare the range of f) in a measurable state, hang the sampled 5 cm ring on the upper and lower hooks of the thermal stress measuring instrument, 2.94 mN × display tex (1/30)
After applying an initial load (gf × display denier), the measurement of thermal stress is started. The heating rate is 300 ° C./120 seconds. Thirty
The measurement is completed when the temperature is raised to 0 ° C. The measurement is performed 3 times, and the average value is used. The thermal stress at 160 ° C is the stress per fineness at 160 ° C (cN / dtex).
Is. <Total crimp ratio (TC)> 1225/2500 mN × 9 × display tex (50 mg × display denier) is applied to the wound frame and wound around a cassette frame, about 3300 dtex (3000 de)
Make a case. 49/250 at one end of the maze after making it
0 mN × 9 × display tex + 49/25 mN × 9 × display tex (2 mg × display denier + 200 mg × display denier) is added and the length L0 (c
m) is measured. Then, in a state where the load of 49/25 mN × 9 × display tex (200 mg × display denier) is removed, the resultant is treated in boiling water at 100 ° C. for 20 minutes. After boiling water treatment 49 / 2500mN × 9 × display tex (2m
The load of (g × display denier) is removed, and it is naturally dried for 24 hours in a free state. 49/25 again for naturally dried samples
A load of 00 mN × 9 × display tex + 49/25 mN × 9 × display tex (2 mg × display denier + 200 mg × display denier) is added, and the length L1 after 1 minute has elapsed
(Cm) is measured. Next, the load of 49/25 mN × 9 × display tex (200 mg × display denier) was removed, the length L2 after 1 minute elapsed was measured, and the next total crimp ratio was calculated. TC (%) = [(L1−L2) / L0] × 100 The measurement was performed 10 times, and the average value thereof was obtained. <Fabric characteristics> Each of the evaluation items is a sensory evaluation by five skilled panelists, and all of them are judged to be extremely good (excellent), those of which 3 or more are judged to be good (good), and 3 or more. What was judged to be defective was ranked as (defective) in three stages.

[Example 1] 0.75 of sodium alkyl sulfonate having 7 to 20 carbon atoms and 8 average carbon atoms was used.
Polyethylene terephthalate containing 0.6% by weight of intrinsic viscosity was melted and discharged from the spinneret, the discharged yarn was cooled and solidified, and then an oil agent was applied, and then the number of nozzles was 3
2250 m / m after applying interlace using air with a pressure of 0.15 MPa with
It was taken up at a speed of in, semi-stretched at a speed of 3030 m / min, and wound as a polyester fluff yarn (A) of 120 dtex / 36 fil.

On the other hand, a polyethylene terephthalate type copolymerized polyester having an intrinsic viscosity of 0.64 obtained by copolymerizing an isophthalic acid component with 10 mol% as a high viscosity polyester, and a polyethylene terephthalate having an intrinsic viscosity of 0.43 as a low viscosity polyester are compounded. Side-by-side composite melt spinning with a weight ratio of 50:50 (melt spinning temperature 285
℃, melt viscosity difference 70Pa ・ sec), winding speed 1
After winding at 450 m / min, preheat roller temperature 9
0 ° C., heat set heater (non-contact type) temperature 230 ° C., stretching ratio 2.7 times, stretching speed 1200 m / min, 55 d
It was wound as latent crimp type polyester composite fiber (B) of tex / 12fil.

The polyester filament yarn (A) thus obtained was heated at a preheating roller temperature of 110 ° C. and a heat set heater (non-contact type).
Temperature 230 ° C, overfeed rate 2%, stretching speed 60
After relaxation heat treatment at 0 m / min, it is aligned with the latently crimped polyester composite fiber (B) with a roller, combined with an interlacing device, and wound as a single yarn on a winder, 175 dtex / 48 fil. To obtain a polyester composite fluff yarn.

The polyester composite fluff thus obtained is used as a warp and a weft, and woven in a habutae, scouring, heat setting, alkali weight reduction processing (weight reduction rate 15%), dyeing and a plain dyed woven fabric according to a conventional method. Got The evaluation results are shown in Table 1.

[Examples 2 to 3 and Comparative Examples 1 to 5] The spinning conditions for producing the polyester fluff (A) were appropriately changed, and the single fiber cross section, elongation and hot water shrinkage rate shown in Table 1 were calculated. A polyester fluff yarn (A) having At that time, the unevenness characteristics of the polyester uneven yarn (A) were changed mainly by changing the applying conditions such as the air pressure of the interlacing applying device. Subsequently, the polyester filament yarn (A) and the latent crimp type polyester conjugate fiber (B) were mixed under the same conditions as in Example 1 to obtain a polyester filament yarn having the same fineness and the same filament number as in Example 1. . Table 1 shows the evaluation results of the composite fluff yarn properties and the fabric properties.

[Comparative Example 6] When the polyester filament yarn (A) and the latent crimp type polyester composite fiber (B) were mixed and treated,
Instead of subjecting the polyester fluff (A) to relaxation heat treatment, it was drawn 1.2 times under the same temperature conditions. The other conditions were the same as in Example 1. Table 1 shows the evaluation results of the composite fluff yarn properties and the fabric properties.

[Comparative Example 7] As an alternative to the polyester filament yarn (A), unstretched yarn obtained at a spinning speed of 3400 m / min was subjected to a relaxation heat treatment in a heater heated at 230 ° C for 0.7 seconds in a relaxation state of 2%. Example 1 other than the above.
The same polyester fluff yarn (A) was used. On the other hand, as an alternative to the latently crimped polyester composite fiber (B), 8 unstretched yarns obtained at a spinning speed of 1200 m / min were used.
It was stretched 3.1 times while being heated at 5 ° C. and set at 170 ° C. Other than that, the same latent crimp type polyester conjugate fiber (B) of Example 1 was used. Then, the fibers were mixed under the same conditions as in Example 1 to obtain a polyester composite fluff having the same fineness. Table 1 shows the evaluation results of the composite fluff yarn properties and the fabric properties.

[0049]

[Table 1]

[0050]

EFFECT OF THE INVENTION According to the polyester composite fluff yarn having latent crimping performance of the present invention, a natural feeling, a dry sensation when touched, a spanize appearance, and a stretch performance which are not found in conventional polyester fluff yarns are obtained. A fabric having is obtained. Further, when the polyester fluff yarn contains a fine pore forming agent, a cotton fabric which is excellent in characteristics such as bathochromic property, sweat absorbing property and comfort during wearing can be obtained. The target value is extremely large.

[Brief description of drawings]

FIG. 1 is a view showing an example of a spectrograph of a polyester composite fluff yarn having latent crimp performance of the present invention.

FIG. 2 is a diagram showing an example of a conventional spectrograph of polyester fluff.

Continued front page    F term (reference) 4L035 BB31 DD02 GG03 JJ15 JJ23                 4L036 MA05 MA20 MA33 MA39 PA01                       PA03 RA03 RA04 UA01

Claims (7)

[Claims] 1. A composite yarn obtained by mixing a polyester fluffy yarn (A) containing monofilaments having a fineness in the yarn length direction and a latent crimp type polyester conjugate fiber (B), obtained by a normal test. On the spectrograph, the peak values (P _max1 , P
_max2 ) exists and its peak value ratio (P _max1 /
Polyester composite fluff yarn having latent crimp performance, characterized in that P _max2 ) is 1.2 to 4.0. 2. A value P ₂₀ and a peak value P _max1 at a period of 20 cm on the spectrograph obtained by a normal test.
The ratio (P _max1 / P ₂₀ ) of 1.5 to 4.0.
A polyester composite fluff yarn having latent crimp performance as described in 1. 3. A single fiber having a thickness in the length direction has a thick portion length of 1 to 15 mm, and a Worcester normal U% as a composite fluff is 3.5% or more. Polyester composite yarn having latent crimp performance. 4. The hot water shrinkage of the latently crimped polyester conjugate fiber (B) is higher than that of the polyester fluff (A) by 5% or more. Polyester composite fluff having latent crimping performance of 5. The polyester fluff (A),
The polyester composite fluff yarn having latent crimping performance according to any one of claims 1 to 4, wherein the single fiber has a triangular cross-sectional shape. 6. The polyester composite fluff having latent crimp performance according to claim 1, wherein the polyester fluff (A) contains a fine pore forming agent. 7. The polyester composite fluff yarn having latent crimp performance according to claim 1, wherein the fine pore-forming agent is a metal salt compound represented by the following general formula. [Chemical 1] In the formula, M and M ′ are metals, R is a hydrogen atom or an ester-forming functional group, and n is 1 or 2.