JPH0860463A - Production of bulky polyester yarn - Google Patents

Abstract

PURPOSE: To obtain a bulky yarn having delicate uneven feeling while suppressing the fluffing and breakage of the yarn by subjecting a highly oriented undrawn polyester yarn to simultaneous drawing and false-twisting treatment after entangling and preliminary drawing treatments. CONSTITUTION: A highly oriented undrawn polyester filament yarn 2 having a birefringence of 15 to 70×10<-3> and a single fiber fineness of <=2.1de is taken out of a package 1, supplied to an entangling device 4, entangled at a density of 10-80/m with air at a temperature below the second-order transition temperature of the polyester yarn 2 and subjected to preliminary drawing treatment between nip rollers 5, 7 in an atmosphere controlled to <=55 deg.C with an atmospheric temperature controlling plate 6 at a draw ratio corresponding to 95-30% of the natural draw ratio. The treated yarn is successively subjected interposing an interval of 0.005-0.1sec to the simultaneous drawing and false-twisting treatment at >=300 deg.C and a processing speed of >=600m/min. The fluctuation of the processing tension is suppressed by applying a twist corresponding to >=20% of the finally needed twisting number in an atmosphere maintained to <=60 deg.C after the preliminary drawing treatment and carrying out the simultaneous drawing and false-twisting treatment.

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 polyester bulky yarn using a polyester highly oriented undrawn yarn. More specifically, it relates to a production method for stably obtaining a polyester bulky yarn having a subtle unevenness by high-speed processing.

[0002]

2. Description of the Related Art Conventionally, many methods for producing a polyester bulky yarn using undrawn polyester yarn have been proposed. It can be roughly classified and summarized as follows. (1) Using a highly oriented undrawn yarn, in the process before drawing false twist,
A method in which a heating element such as a pot pin or a hot plate is provided, preliminary drawing is performed at an appropriate drawing ratio or less, and then false twisting is performed (Japanese Patent Publication No. 62-34850). (2) Using a highly oriented undrawn yarn, in the process before drawing false twist,
A method of carrying out false twisting after cold-drawing at a draw ratio of not more than an appropriate draw ratio (Japanese Patent Publication No. 63-17931 and Japanese Patent Publication No. 62-49370). (3) A method in which an unstretched yarn made of a thermoplastic polymer is stretched at a stretch ratio of not more than a natural stretching ratio, then heated and subsequently twisted and crimped (Japanese Patent Publication No. 61-40769).

[0003]

However, the above-mentioned conventional techniques have the following problems. (1) The method proposed in Japanese Examined Patent Publication (Kokoku) No. 62-34850 discloses a thick,
Fine stretching unevenness can be controlled relatively uniformly, but 4
The controllable limit is from 00 m / min to 450 m / min, and it is unstable at higher speeds, especially at 600 m / min or more, and quality irregularities and tension fluctuations in the subsequent drawing false twisting process are large, resulting in processability. I had a problem with. (2) Japanese Patent Publication No. 63-17931 and Japanese Patent Publication No. 62-
The method proposed in Japanese Patent No. 49370 produces extremely uneven thick and thin drawing unevenness, so that the tension and tension fluctuations in the drawing false twisting step in the subsequent step are extremely large, and the processing in the drawing false twisting in the next step is performed. The quality was not good, and there was a problem with quality. (3) The method proposed in Japanese Examined Patent Publication No. 61-40769 has been shown to be effective in preventing fuzz and yarn breakage, but has a problem in workability at high speed and friction false twist. There is a problem that it cannot be used in high-speed machining.

In order to solve the above-mentioned conventional problems, the present invention is a high-speed stretch simultaneous false twist of 600 m / min or more, more preferably 800 m / min or more, and a polyester bulky yarn having a subtle unevenness feeling and a unique texture. It is an object of the present invention to provide a method for stably producing Further, it is an object of the present invention to provide a method for stably producing a polyester bulky yarn with less fluff and less yarn breakage.

[0005]

In order to achieve the above object, the method for producing a polyester bulky yarn of the present invention is a method for producing a bulky yarn by drawing and simultaneously false twisting a polyester synthetic fiber filament yarn. A polyester-based highly oriented undrawn yarn having a birefringence (Δn) in the range of 15 to 70 × 10 ⁻³ is used as the raw yarn, and 10 to 80 k / m in the temperature range below the secondary transition point of the polyester. It is characterized in that entanglement is added, and then pre-stretching is performed in the range of D _N × 95% to D _N × 30%, and subsequently, simultaneous drawing and false twisting treatment is performed in an atmosphere at a temperature of 300 ° C. or higher. (However, D _N means a natural draw ratio.) In the above configuration, the time from the drawing process to the simultaneous drawing false twisting process is in the range of 0.005 to 0.1 seconds. Is preferred.

In the above construction, after the stretching treatment, 6
The required twisting number of 2 at the temperature of 0 ° C or less
It is preferable to add 0% or more of twist, and then draw false twisting treatment.

In the above construction, the polyester highly oriented undrawn yarn has a particularly great effect on thin single yarn denier yarns having a constituent single yarn fineness of 2.1 denier or less. It is preferably in a state.

Further, in the above construction, it is preferable that the processing speed of the high-speed simultaneous drawing false twist is 600 m / min or more.

[0009]

According to the above-described method of the present invention,
And the birefringence (Δn) is 15 to 70 × 10.^-3Range of poly
Ester-based highly oriented undrawn yarn is used, and the secondary transition point (about 60
℃) in the temperature range of 10 ~ 80 / m entanglement is added,
Then D_N× 95% ~ D _N× 30% (however, D_NWhat is
Refers to the natural draw ratio. ) Pre-stretch in the range and continue
And simultaneous false twisting processing at an temperature of 300 ° C or higher
600m / min or more is more preferred
High-speed drawing simultaneous false twisting of at least 800 m / min enables delicate
Stable polyester bulky yarn with a feeling of ra and unique texture
It can be manufactured. Also, there are few fluffs and the thread
There are few breaks and it has excellent workability.

That is, the birefringence (Δn) is 15 to 70.
When a highly oriented undrawn yarn of × 10 ⁻³ is drawn in the range of _DN × 95% to _DN × 30% in an atmosphere state of 60 ° C. or less, the necking point varies greatly, and the fineness of thick and thin is fine. The unevenness is large. Therefore, if it is put in the stretched false twisting region at high speed as it is, the processing tension becomes unstable, the fluctuation rate is large, and stable false twisting cannot be performed. For example, the processability was deteriorated due to extremely large number of yarn breaks, and there were many fluffs and uneven unevenness of light and shade, which made it impossible to apply to actual production. According to the method of the present invention, it is 10 to 8 at the second transition point (about 60 ° C.) or lower.
Add 0% / m of entanglement to give the yarn a convergent integrity, and then draw it in the range of _DN × 95% to _DN × 30%, and then continuously draw it in an atmosphere at a temperature of 300 ° C or higher. By performing the twisting process, the conventional problems could be improved brilliantly. That is, when the yarn is introduced into the heater at a temperature of 300 ° C. or higher at a high speed, the yarn temperature rise time is short, so that it has the effect of suppressing the tension fluctuation in the twisted portion. As a result, the workability becomes stable. Even after passing through the drawing simultaneous false twisting process, about 10 to 30% of the entanglement initially added remains. Therefore, during the simultaneous drawing and false-twisting process, the migration of filament yarns (filaments are exchanged inside and outside the yarn) is appropriately changed, and the obtained drawn false-twisted yarns exhibit a delicate texture. In addition, since a considerable part of the pre-entanglement remains, there is little fluff, and the unwinding from the package and the process passability in the high-order processing stage such as weaving are extremely good.

In the above construction, the time from the drawing treatment to the simultaneous drawing false twisting processing is 0.005 to 5.
According to the preferable example of being in the range of 0.1 second, the strain after stretching is not relaxed, fluctuations in the tension in the twisted portion are reduced, and the processing tension in the untwisted portion and the like is stabilized. .

In the above structure, after the stretching treatment, 60
Twisting number of 20 which is finally required in the atmosphere below ℃
According to a preferable example in which a twist of not less than 100% is added and then a drawing false twisting process is performed, it is possible to further suppress the fluctuation of the process tension. If the twisting number is in the range of 25 to 50%, stable processing is possible.

According to a preferred example of the above constitution, the polyester single-oriented highly oriented undrawn yarn has a constituent monofilament fineness of 2.1 denier or less and a drawing condition of 55 ° C. or less in an atmosphere. Further, stable processing becomes possible. That is, in the case of 2.1 denier or less, since the single yarn denier is thin, fluffing is likely to occur, or there are many yarn breakages due to tension fluctuation, but stable processing is possible by adopting the above configuration. is there.

Further, in the above construction, according to the preferable example in which the processing speed of the simultaneous drawing false twist is 600 m / min or more, the productivity can be improved.

[0015]

The present invention will be described more specifically with reference to the following examples. FIG. 1 is a processing step diagram (high-speed drawing false twisting machine) showing an embodiment of the present invention. In FIG. 1, 1 is a package of polyester highly oriented undrawn yarn (original yarn), 2 is the same drawing yarn thread, 3 is a first yarn guide, 4 is an air entangler,
5, 7 and 11 are nip rollers, 6 and 8 are atmospheric temperature control plates, 9 is a heater for false twist heat treatment, 1
0 is a twisting tool (twister), 12 is a take-up roller,
13 is a winding package.

The polyester highly oriented undrawn yarn 1 has a birefringence (Δn) in the range of 15 to 70 × 10 ⁻³ . Next, the interlacing device 4 is of a type in which pressurized air is jetted substantially at right angles to the multifilament yarn. I mean, instead of making a loop or snare,
Simply give migration to the yarn and give it entanglement. The number of entanglements is required to be in the range of 10 to 80 / m. If the number of entanglements is less than 10 / m, the advantage of applying preentanglement is small, and if it exceeds 80 / m, simultaneous false twisting during drawing cannot be performed smoothly.

Next, the atmosphere temperature control plate 6 is used to maintain the temperature in the atmosphere state of not lower than room temperature and not higher than 60 ° C., and between the nip rollers 5 and 7, _DN × 95% to _DN × 30%.
(However, D _N means a natural stretching ratio), and preliminary stretching is performed. Here, the natural draw ratio (D _N ) will be described with reference to FIG. When the strength-elongation characteristic of the undrawn yarn is measured by using a generally-used tensile strength / elongation measuring means, a curve as shown in FIG. 2 can be obtained. The vertical axis of FIG. 2 is strength (tension), and the horizontal axis is elongation. When the elongation is low, the strength (tension) rises rapidly and reaches the yield point (peak). After that, the strength (tension) is almost constant and only the elongation increases. When the yarn is further pulled, the strength (tension) increases in proportion to the elongation, and the yarn is finally cut.
In the above, the bending point from the region where the strength (tension) is almost constant and only the elongation increases to the region where the strength (tension) increases in proportion to the elongation is the natural draw ratio (D _N ). Normal stretching is performed in a range exceeding the natural stretching ratio (D _N ) in order to ensure uniformity and keep cooperation high. However, in the present invention, in order to give a natural feeling of unevenness by positively performing uneven drawing at a high speed in the preliminary drawing step, D _N × 95% to D
Pre-stretch in the range of _N × 30%.

Next, after the preliminary drawing process, the simultaneous drawing and false twisting process is subsequently carried out in an atmosphere of a heater temperature of 300 ° C. or higher. In the simultaneous drawing and false twisting process, false twisting is applied to the yarn by a twisting tool (twister) 10, and the nip roller 7
And between 11 and 11. Then take-up roller 12
And, it is wound by using the winding package 13.

In the above, the time from the preliminary drawing step to the simultaneous drawing false twisting processing is 0.005 to 0.
Keep in the range of 1 second. As a result, the strain after stretching is not relaxed, fluctuations in the tension in the twisted portion can be reduced, and the processing tension in the untwisted portion and the like can be stabilized.

Further, in the above constitution, after the stretching treatment, 60
Twisting number of 20 which is finally required in the atmosphere below ℃
According to a preferable example in which twisting in the range of -50% is applied and then the drawing false twisting treatment is performed, it is possible to further suppress fluctuations in processing tension. If the twisting number is in the range of 25 to 60%, stable processing becomes possible. In order to add the twist just before the simultaneous drawing false-twist, the twist within a range of 25 to 50% of the twist added by the twisting device (twister) 10 reaches the area of the ambient temperature control plate 8. . In the case of high-speed drawing false twist, the propagation of twist from the twisting device is poor, and therefore, specifically, the bending angle of the yarn path is minimized, or the yarn path is held in a straight state, or a yarn path guide is selected. With these measures, high-speed stretch simultaneous false twisting of 600 m / min or more, more preferably 800 m / min or more becomes practical.

A specific example will be described below. (Example 1) As a device used, high-speed drawing false twist shown in FIG.
Machine was used. Raw yarn used is polyethylene terephthalate
Fiber, birefringence (Δn) = 30 × 10^-3Highly oriented unstretched
Yarn (, total fineness: 250 denier, filament
Number: 48, natural draw ratio: D _N= 65%) was used.
And the pre-entanglement pressure of the confounder 4 is 3 to 5 kg / cm.²of
Change in the range and change the number of confounding in the range of 6 to 90 pieces / m
It was On the other hand, the winding speed: 800 m / min,
The pre-stretch ratio between the rollers 5 and 7 is 27%
(1.27 times), D_NSpecific draw ratio: (27/65) x 1
00 = 42%. In addition, twisting device (Twister) 1
The number of twists added at 0 is 2,350 T / M (atmosphere temperature control
Number of twists reaching the area of the roll plate 846T / M, twisting equipment
(36% of the number of twists added at room temperature). Also, of the heater 9
High-speed drawing Simultaneous false twist area draw ratio is 1.40 times
And Total fineness of processed yarn obtained in this way
Was 150 denier. Also, the obtained processed yarn
Has less fluctuation in processing tension, less yarn breakage, and good texture
It became a thing. The above conditions and results are summarized in Table 1.
You

[0022]

[Table 1]

As is clear from Table 1, the confounding number is 10-8.
Good processed yarn was obtained in the range of 0 / m. (Example 2) In Example 1, the pre-entanglement pressure of the interlacing device 4 was set to 4 kg / cm < ² > and the number of intertwined lines was set to 40 to 44 ke / m. The pre-stretch ratio between the nip rollers 4 and 6 is 34% (1.34 times), the D _N ratio stretch ratio: (34/6
5) × 100 = 54%, and the twisting number reaching the area of the atmosphere temperature control plate 8 is as shown in Table 2, and
o. 7: 635T / M, 27 twists added by twisting device
%, Experiment No. 8: 846 T / M, 36% of the number of twists added by the twisting device, Experiment No. 9: 1081 T / M, 46% of the number of twists added by the twisting device, Experiment No. 10: 400T /
M was performed under the same conditions as in Example 1 except that the number of twists added by the twisting device was 17%. As a result, the experiment No.
No. 10 was slightly inferior, but other than that, as in Example 1, there was little variation in processing tension, less yarn breakage, and good texture. The above conditions and results are summarized in Table 2.

[0024]

[Table 2]

From the above Examples and Comparative Examples, the following was found. (1) Since a considerable part of the pre-entanglement remains, there is little fluff, and the unwinding from the package and the process passability in the high-order processing stage such as weaving are very good. (2) The birefringence (Δn) is 15 to 70 × 10 ⁻³ ,
Highly oriented undrawn yarn is D _N × 95 in an atmosphere of 60 ° C or less
% -D _N × 30%, and then draw false twisting is performed with a heater in an atmosphere of 300 ° C. or higher at a yarn speed of 600 m / min. (3) More preferably, after stretching in the range of D _N × 95% to D _N × 30%, it is placed in a heater of 300 ° C. or higher for 0.005 to 0.1 seconds, and subsequently stretched and false twisted. . This makes it possible to reduce fluctuations in tension in the twisting portion and stabilize the processing tension in the untwisting portion and the like (FIG. 3). (4) More preferably, D _{N in} an atmosphere of 60 ° C or lower
After stretching in the range of × 95% to _DN × 30%, the twisting number is 20% or more, particularly preferably 25% or more, of the final twisting number required during false twisting in an atmosphere of 60 ° C. or less. After doing
It is placed in a heater at 300 ° C. or higher and drawn and false-twisted (FIG. 4). (5) For that purpose, it is necessary to reduce the frictional resistance of the heater and the guide and reduce the propagation of twist, which is possible by limiting the bending degree of the yarn path and selecting the guide. (6) The yarn obtained in such a state is D _N × 95% to D
_The yarn obtained by pre (preliminary) drawing with _N × 30% is a yarn with a large amount of thick and thin unevenness with a great deal of non-uniformity, but after that, it is drawn by twisting and drawn to an appropriate ratio, and is almost fully drawn. Since it is false-twisted in this state, thick and thin unevenness is alleviated, but it does not completely disappear, and the effect of bulkiness of the yarn is increased due to these uneven unevenness, and it gives an inconspicuous but extremely high-class natural unevenness feeling. Also, it has a unique texture.

[0026]

As described above, according to the present invention, the original
The birefringence (Δn) of the thread is 15 to 70 × 10^-3Range of
Polyester-based highly oriented undrawn yarn of
Entanglement of 10 to 80 pieces / m in a temperature range of (about 60 ° C.) or less
And then D_N× 95% ~ D _N× 30% (However,
D_NMeans a natural draw ratio. ) In the range of preliminary drawing,
Sequentially false-twisting in an atmosphere with a temperature of 300 ° C or higher
More than 600m / min by processing, further
High-speed drawing simultaneous false twisting of 800 m / min or more is preferable,
Polyester bulky yarn with a strange unevenness and unique texture is cheap
It can be manufactured regularly. Also, there is less fluff,
It also has less thread breakage and excellent workability.

[Brief description of drawings]

FIG. 1 is a process drawing using a high-speed drawing false twisting machine showing an embodiment of the present invention.

FIG. 2 is an explanatory view of a natural draw ratio (D _N ) used in the present invention.

FIG. 3 is a relational diagram showing the time taken to exit the preliminary drawing region and enter the simultaneous drawing false-twisting region and the change in twisting tension in one example of the present invention.

FIG. 4 is a relationship diagram showing a required twisting number and a twisting tension variation in a region immediately before a simultaneous drawing and false twisting region according to an example of the present invention.

[Explanation of symbols]

1 Package of polyester type highly oriented undrawn yarn (original yarn) 2 Draw-out yarn 3 First yarn guide 4 Entangling machine 5, 7, 11 Nip roller 6, 8 Atmosphere temperature control plate 9 Heater for false twist heat treatment 10 Addition Twisting device (Twister) 12 Winding roller 13 Winding package

Claims (5)

[Claims] 1. A method for producing a bulky yarn by simultaneously drawing and false twisting a polyester-based synthetic fiber filament yarn, wherein a birefringence (Δn) as a raw yarn is 15 to 70 × 10 ^−3.
Of the polyester highly oriented undrawn yarn in the range of 10 to 80 / m in the temperature range below the second-order transition point of the polyester, and then D _N × 95% to D _N × 30%
The method for producing a polyester bulky yarn, which comprises pre-drawing in the range of 1) and subsequently performing simultaneous drawing and false twisting treatment in an atmosphere at a temperature of 300 ° C. or higher. (However, D _N means a natural draw ratio.) 2. The method for producing a polyester bulky yarn according to claim 1, wherein the time from the drawing treatment to the simultaneous drawing false twisting treatment is in the range of 0.005 to 0.1 seconds. 3. The polyester bulky according to claim 1, wherein after the stretching treatment, 20% or more of the finally required twist number is added in an atmosphere of 60 ° C. or lower, and then the stretch false twisting treatment is performed. Thread manufacturing method. 4. The polyester bulky yarn according to claim 1, wherein the constituent single yarn fineness of the polyester highly oriented undrawn yarn is 2.1 denier or less, and the drawing condition is an atmosphere of 55 ° C. or less. Production method. 5. The processing speed of high-speed drawing simultaneous false twist is 600.
The method for producing a polyester bulky yarn according to claim 1, 2, 3 or 4, which has a rate of m / min or more.