JPH09250034A - False twist texturing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a false twist textured yarn having uniform and high crimp performance even from an ultrafine diver and a low-oriented fiber by carrying out the simultaneous draw false twist texturing using a point for completing the heating of a heating zone for heating a synthetic fiber yarn having tangles imparted thereto in a non-twist state as a point for starting the twisting. SOLUTION: The previous interlacing treatment of a synthetic fiber yarn 1 is carried out with an air interlacing nozzle 4 and the resultant yarn 41 is then heated with a heating roller 5 on a non-twist state. Furthermore, the yarn is subsequently passed through a heater 8 and a false twisting tool 9 by using a pointer completing the heating as a point for starting the twisting top perform the simultaneous draw false twist texturing without causing yarn breakage or fuzz. The number of tangles is about 2-200 tangles/m, preferably 5-10 tangles/ m.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for false twisting synthetic fiber yarns, and more specifically, false twisting suitable for false twisting ultrafine fibers, low orientation fibers and composite processed yarns containing them. It relates to a processing method.

[0002]

2. Description of the Related Art Conventionally, in the simultaneous drawing and false twisting process of synthetic fiber yarns, the yarns in the twisting region are heated to a temperature of about 200 ° C., and the yarns are stretched, twisted and heat-fixed, and then untwisted. Was mainly adopted, and the obtained false twisted yarn generally had a high crimping ratio of 25 to 40%.

For the false twisting process, a false twisting device, which is generally called a DTY machine, is provided with a yarn supplying roller and a take-up roller, and a heater plate and a false twisting tool provided between the rollers (Japan Textile Machinery Co., Ltd.). The Society's publication, "Filament Processing Technical Manual (first volume)", p. 77 to p. 78) is used exclusively, but when trying to increase the processing speed, the heater plate becomes longer and stretches in the heating area. Therefore, it was found that the following problems occur especially when processing ultrafine fibers and low orientation fibers. -The drawing point and the twisting start point are likely to change due to the change in twisting tension, and many yarn breakages and fluffs occur. -The heat is not sufficiently transmitted to the inside of the yarn, and crimp unevenness is likely to occur due to heating unevenness.

Further, when two or more kinds of undrawn yarns having different elongations are aligned with each other by using the above apparatus to produce a composite false twisted yarn having an alternate twisted yarn shape, heating of the yarn is twisted. It has also been found that there is a problem in that twisting becomes unstable because it is performed in a region, and unevenness in the winding structure of the high elongation yarn tends to occur.

In order to solve such a problem, the inventors of the present invention first used a yarn supplying roller of a false twisting device (DTY machine) as a heating roller, and previously heating it in a non-twisted state, and then ending the heating. It was proposed that the false twisting be carried out immediately by using the point as the twisting start point, but at that time, it was clarified that a better result can be obtained when the entanglement is applied to the supplied yarn in advance.

[0006]

The object of the present invention is to produce crimped yarns of ultrafine fibers and low-orientation fibers and composite false twisted yarns containing them, without producing broken yarns or fluffs. An object of the present invention is to provide a false twisting method in which the obtained false twisted yarn has a uniform and high crimp.

[0007]

According to the present invention, a synthetic fiber yarn is heated in a non-twisted state, and then, at the time of simultaneous drawing false twisting with the heating end point as a twisting start point, before heating. There is provided a false twisting method, which is characterized by imparting entanglement to a synthetic fiber yarn in advance.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view of a false twisting apparatus showing an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a heat-stretchable synthetic fiber yarn such as polyester fiber or polyamide fiber, and a polyester fiber yarn is particularly preferred.

In particular, the above synthetic fiber yarn is a low orientation yarn such as an ultrafine fiber yarn having a single fiber fineness of 0.5 denier or less and an undrawn yarn spun at a spinning speed of 3500 m / min or less. In this case, the effect of the present invention is remarkably exhibited.

The denier of the synthetic fiber yarn is not particularly limited, but it is preferably 200 denier or less in order to prevent the occurrence of crimp unevenness and unevenness of the wound structure of the composite false twisted yarn. .

Next, the synthetic fiber yarn 1 is connected to the guide 2
And it is supplied to the air entanglement nozzle 4 through the pretension roller 3 and is entangled.

Next, the entangled yarn 1 is supplied to a heating roller 5, wound a plurality of times around the heating roller via a separate roller 6, and then twisted and untwisted by a false twisting tool 9. After being applied and taken up by the take-up roller 10, it is taken up by the spindle type take-up device 12 on the pan 13.

The above-mentioned entanglement may be carried out, for example, by passing the yarn between the pretension roller 3 and the heating roller 5 while passing the yarn through the air entanglement nozzle,
A conventionally known interlace nozzle or the like can be arbitrarily used as the air entanglement nozzle.

The number of entanglements at this time may be appropriately set depending on the type and denier of the synthetic fiber yarn to be used.
The number is preferably 200 / m, and more preferably 5 to 10 / m. If the number of entanglements is less than 2 / m or more than 200 / m, the effect of the present invention may not be sufficiently exhibited.

In the above-mentioned interlacing and false twisting, it is not always necessary to use an integrated device as shown in FIG.
The interlacing and false twisting may be performed separately.

In the present invention, the entangled yarn has its constituent fibers arranged at random as shown in FIGS.

Generally, in the false twisting process, the constituent single fibers are phase-shifted during twisting to form a high crimp, but as in the present invention, synthetic fiber yarns, particularly ultrafine fibers and low fibers are formed. After heating a yarn composed of oriented fibers in a non-twisted state and performing false twisting with the heating end point as a twisting start point, phase transfer is unlikely to occur and sufficient crimping tends not to be obtained. There is.

Therefore, in the present invention, sufficient crimping is achieved by imparting entanglement to the synthetic fiber yarns prior to twisting and disturbing the arrangement of the constituent single fibers in advance to facilitate phase transfer. It is possible to give.

In the present invention, since the yarn supplying roller is a godet type roller having a separate roller, and the roller is a heating roller, the synthetic fiber yarn is first heated in a non-twisted state. The fiber is opened on the roller, and a sufficient amount of heat can be applied to the constituent single yarn in the central portion.

Further, by adopting the above configuration,
The heating end point of the heating roller outlet becomes the twisting start point,
When the heated yarn is twisted by the twisting force, stress concentration occurs, so the stretching point and twisting start point are fixed,
It is possible to prevent yarn breakage and fuzz.

Further, in manufacturing the composite false twisted yarn, since the twisting start point is fixed at the exit of the roller,
There is also an advantage that unevenness in the winding shape of the high elongation yarn around the core yarn is unlikely to occur.

The temperature of the heating roller may be appropriately set depending on the kind of the synthetic fiber yarn to be used, the desired crimping performance, etc., but may be equal to or higher than the glass transition temperature of the synthetic fiber yarn to be used. preferable. However, if the temperature is too high, the fusion of the yarns and the breakage of the yarns occur frequently, so a temperature of about 210 ° C. or less is usually adopted.

The number of windings on the heating roller may be appropriately set according to the desired amount of heat, but it is preferable to wind 4 times or more to prevent slipping of the yarn.

As the false twisting tool, conventionally known ones such as a pin type and a triaxial friction type disc type can be arbitrarily adopted, but a false twisting device of a triaxial friction type disc type capable of increasing the false twisting speed can be used. preferable.

Further, in order to prevent the retrogression of twisting to the surface of the heating roller and to further secure the fixing of the stretching point and the starting point of twisting, the yarn pressing indicated by 7 is provided on the heating roller. It is preferable to provide a roller.

The yarn pressing roller is a Japanese Patent Publication No. 52-38.
As disclosed in Japanese Patent No. 138, at least the last one winding of the yarn wound around the heating roller is held on the heating roller, and at least the first one winding is in the untouched state. It is preferable to maintain it.

On the other hand, in the case of obtaining a high crimped yarn by the above-mentioned method, if the heating amount of the heating roller is insufficient, a plurality of heating rollers may be used and an auxiliary heating means may be provided on the downstream side of the heating roller. Any method such as a method of providing the heater plate 8 or a heating gas generator can be adopted.

When a heater plate is used as an auxiliary heating means, a length of 5 is used to prevent generation of fluff and yarn breakage.
It is preferable to use a heater plate of 0 cm or less.

In this case, the heating amount is adjusted so that the drawing point and the false twisting start point are fixed at the exit of the heating roller, and the yarn is run so that stress concentration due to friction and bending does not occur. is necessary.

The crimped yarn that has been twisted and untwisted and taken up by a take-up roller is preferably taken up as a bun using a spindle type take-up device.

That is, when a yarn having a small crimp ratio is wound up as cheese, it is necessary to rewind the yarn in order to improve the openability when the yarn is supplied to the twisting process or the weft of the water jet loom. When the spindle type winding device is used, it can be supplied to the twisting process or the loom as it is, so that there is an advantage that the rewinding process becomes unnecessary.

The shape of the take-up roller is not particularly limited, but it is preferable to use a godet type roller similar to the yarn supplying roller because slipping of the yarn can be almost completely prevented.

Further, if the take-up roller is also a heating roller similar to the yarn supplying roller, the false-twisted yarn can be heat set, and a so-called two-stage heater false-twisted yarn can be easily manufactured.

[0035]

In the present invention, when the synthetic fiber yarn is simultaneously drawn and false twisted, it is heated in a non-twisted state on the yarn supply roller where the twist does not trace back. A sufficient amount of heat can be applied to the.

When the yarn heated on the yarn supplying roller is twisted by the twisting force at the exit of the roller, the stress concentrates at the heating end point and the twisting start point, and the stretching point and the twisting point are applied. Since the starting point of twisting is fixed, false twisted yarn having a uniform and high crimping rate even with ultrafine fibers and low orientation fibers that frequently break or fluff when a conventional DTY machine is used. Can be manufactured stably.

Furthermore, in the present invention, when the synthetic fiber yarns are simultaneously drawn and false twisted, the yarns are previously entangled to disturb the arrangement of the constituent single fibers. Interphase transfer of the single fiber is likely to occur, and even if the above false twisting method is adopted, sufficient crimp can be imparted to the yarn.

[0038]

EXAMPLES The present invention will be described in more detail below with reference to examples. The value of the crimp rate in the examples was measured by the following method.

(1) Crimping rate A denier of 3000 denier was made using a scale, and the crease length L ₀ when 6 g of light load and 600 g of heavy load were hung was read. Remove the heavy load, immerse in warm water of 97 to 100 ° C. for 30 minutes to develop crimps, then naturally dry for 24 hours, and read the length L ₂ when the heavy load is hung again. Remove the heavy load, read the length L ₃ after 1 minute, and calculate by the following formula.

[0040]

## EQU1 ## Crimp ratio (%) = (L ₂ −L ₃ ) / L ₀

(2) Degree of entanglement At the end of a yarn with a length of 1 m, 1/30 of the denier of the yarn
After suspending the load (g), hook a hook having a weight (g) of 1/30 of the denier of the yarn on the center of the yarn and count the number of times it stopped while dropping for 1 m. (Month / m).

When the hook is stopped, the hook is hooked 2 mm downward from the stopped position and dropped again.

[Example 1] A polyethylene terephthalate unstretched yarn (60 denier / 24 filament) spun at a spinning speed of 700 m / min is provided with an interlace nozzle (X-34 manufactured by DuPont) shown in Fig. 1. Using a twisting device, entanglement of yarns and simultaneous false twisting of drawing were performed under the conditions shown in Table 1.

At this time, the yarn after exiting the heating roller was sampled and the degree of entanglement was measured. The degree of entanglement was 5 / m.

A triaxial friction type disc type false twisting device was used as the false twisting device, and the peripheral velocity of the disc was 2160 m / min.

As the winding device, a vertical spindle type winding device was used, and the spindle rotation speed was set to 8900 rpm.

Under the above-mentioned conditions, when 10 buns each having a winding amount of 2.5 kg were produced, no yarn breakage was generated and no fluff was observed on the surface of the obtained bun. The crimp ratio of the obtained textured yarn (16 denier / 24 filament) was 32%.

[Comparative Example 1] The procedure of Example 1 was repeated except that the interlaced nozzle was not used.

When the same amount of false twisted yarn as in Example 1 was produced by the above method, the yarn was broken twice and a large number of fluffs were observed on the surface of the obtained pearl. Also,
The crimp ratio of the obtained textured yarn was 10%.

Example 2 Polyethylene terephthalate unstretched yarn spun at a spinning speed of 1200 m / min (140
Using the same false twisting device as in Example 1, the denier / 36 filaments were subjected to the yarn entanglement and the simultaneous drawing false twisting process under the conditions shown in Table 1. At this time, the degree of entanglement of the yarn after leaving the heating roller was 2 pieces / m. A triaxial friction type disc type false twisting device was used as the false twisting device, and the peripheral speed of the disc was 2035 m / min. As the winding device, a vertical spindle type winding device was used, and the spindle rotation speed was set to 8000 rpm.

Under the above-mentioned conditions, when 10 buns each having a winding amount of 2.5 kg were produced, no yarn breakage occurred, and no fluff was observed on the surface of the obtained bun. The crimp rate of the obtained textured yarn (46 denier / 36 filament) was 25%.

Example 3 The procedure of Example 2 was repeated, except that the conditions of yarn entanglement and simultaneous drawing false twisting were changed as shown in Table 1. At this time, the degree of entanglement of the yarn after leaving the heating roller was 9 yarns / m. In addition,
A triaxial friction type disk type false twisting device is used for the false twisting device.
The peripheral speed of the disk was 1520 m / min. A vertical spindle-type winding device was used as the winding device, and the spindle rotation speed was set to 7,000 revolutions / minute.

Under the above-mentioned conditions, when 10 buns each having a winding amount of 2.5 kg were produced, no yarn breakage occurred, and no fluff was observed on the surface of the obtained bun. The crimp rate of the obtained textured yarn (46 denier / 36 filament) was 30%.

Example 4 Polyethylene terephthalate unstretched yarn spun at a spinning speed of 1100 m / min (140
The denier / 36 filaments are entangled and simultaneously drawn by false twisting under the conditions shown in Table 1 using a false twisting device equipped with an interlace nozzle (D-Pont X-33) shown in FIG. It was At this time, the degree of entanglement of the yarn after leaving the heating roller was 98 pieces / m. A triaxial friction type disc type false twisting device was used as the false twisting device, and the peripheral speed of the disc was 2035 m / min. As the winding device, a vertical spindle type winding device was used, and the spindle rotation speed was set to 8000 rpm.

Under the above-mentioned conditions, when 10 buns each having a winding amount of 2.5 kg were produced, no yarn breakage occurred, and no fluff was observed on the surface of the obtained bun. The crimp ratio of the obtained textured yarn (46 denier / 36 filament) was 29%.

Example 5 A polyethylene terephthalate unstretched yarn (45 denier / 72 filaments) spun at a spinning speed of 400 m / min was used under the conditions shown in Table 1 using the same false twisting device as in Example 4. Was entangled and simultaneously drawn and false twisted. At this time, the degree of entanglement of the yarn after leaving the heating roller was 175 yarns / m. A triaxial friction type disc type false twisting device was used as the false twisting device, and the peripheral speed of the disc was 2405 m / min. A vertical spindle-type winding device was used as the winding device, and the spindle rotation speed was set to 11000 rpm.

Under the above-mentioned conditions, when 10 buns each having a winding amount of 2.5 kg were produced, no yarn breakage occurred, and no fluff was observed on the surface of the obtained bun. The crimp rate of the obtained textured yarn (10 denier / 72 filaments) was 25%.

[Example 6] Polyethylene terephthalate unstretched yarn (50 denier / 12 filaments) spun at a spinning speed of 3000 m / min was introduced into the same interlace nozzle as in Example 4, and air pressure was 8 kg / mm ² , and overfeed was performed. It was wound after applying entanglement at a rate of 1%. The degree of entanglement of the yarn was 3 pieces / m.

Next, the yarn is used for the false twisting device shown in FIG. 1 (however, the interlace nozzle is not used),
Simultaneous drawing false twisting was performed under the conditions shown in Table 1.

A triaxial friction type disc type false twisting device was used as the false twisting device, and the peripheral speed of the disc was 1480 m / min.

As the winding device, a vertical spindle type winding device was used, and the spindle rotation speed was set to 7,000 rpm.

Under the above-mentioned conditions, when 10 buns having a winding amount of 2.5 kg were produced, no yarn breakage occurred and no fluff was observed on the surface of the obtained bun. The crimp ratio of the obtained textured yarn (30 denier / 12 filament) was 31%.

[0063]

[Table 1]

[0064]

EFFECTS OF THE INVENTION According to the present invention, in particular, crimped yarns of ultrafine fibers and low-orientation fibers and composite false twisted yarns containing them can be produced without causing yarn breakage or fluff, and the obtained false twists can be obtained. A false twisting method in which the textured yarn is uniform and has a high crimp can be provided.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a false twisting device of the present invention.

FIG. 2 is a side view showing an example of the form of the yarn after the entanglement is applied.

[Explanation of symbols]

1 Synthetic Fiber Thread 2 Guide 3 Pre-tension Roller 4 Air Entangling Nozzle 5 Heating Roller 6 Separate Roller Rotating in Pair with Heating Roller 7 Pressing Roller Rotating in Contact with Heating Roller 8 Heating Heater Plate 9 Triaxial Friction Type Disk false twisting device 10 Take-up roller 11 Separate roller that rotates in pair with take-up roller 12 Spindle type take-up device 13 Pane

Claims (4)

[Claims] 1. When the synthetic fiber yarn is heated in a non-twisted state and then subjected to simultaneous drawing false twisting with the heating end point as the twisting start point, entanglement is given to the synthetic fiber yarn before heating in advance. A false twisting method characterized by the above. 2. The number of intertwined synthetic fiber yarns is 2 to 200 /
The false twisting method according to claim 1, wherein m is m. 3. The false twisting method according to claim 1, wherein auxiliary heating means is provided on the downstream side of the heating roller. 4. The false twisting method according to claim 3, wherein the auxiliary heating means is a heater plate having a length of 50 cm or less.