JPH1060745A - Production of bulky elastic yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a bulky elastic yarn which does not increase the incidence of defects even in the case of increasing the number of spindles or after the lapse of long period of time through settling the problems involved in the conventional production method for bulky elastic yarns. SOLUTION: In this method for producing a bulky elastic yarn comprising such operations that an elastic yarn 1 under tension and a thermoplastic inelastic yarn 2 are joined together, blended/interlaced, and then false-twisted, heat-set and untwisted, the blended/interlaced yarn, in a nontwisted state, is heated on the circumference of a false-twist zone feed roller 9, and then false-twisted at the heating endpoint as twisting starting point.

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 bulky elastic yarn in which an elastic yarn is covered with a crimped yarn, and more particularly, to a method for producing a bulky elastic yarn in which the occurrence of a peeling defect of the elastic yarn is prevented. About.

[0002]

2. Description of the Related Art One of the serious drawbacks of a bulky elastic yarn obtained by covering an elastic yarn with a crimped yarn is the peeling of the elastic yarn (displacement of the coated yarn, cutting of the elastic yarn, plastic deformation of the elastic yarn, etc.). This causes the elastic yarn to jump out. The elastic yarn has a different dyeing property from the coated bulky yarn or has a non-dyeing property. Further, since the single-fiber denier is thick, if the peeling occurs, the appearance of the product is significantly impaired.

In order to solve this problem, the present inventors have
Previously, Japanese Patent Application Laid-Open No. 6-10226 proposed a bulky elastic yarn having a multi-stage stress relaxation function and a method for producing the same.

That is, the elastic yarn is covered with the crimped yarn (A) and the crimped yarn (B), and between the elastic yarn and the crimped yarn (A) and between the crimped yarn (A) and the crimped yarn. This is a bulky elastic yarn partially mixed and entangled with the yarn (B). When the bulky elastic yarn is stretched, first, the elasticity of the core portion is stretched, and then the crimped yarn ( A bulky elastic yarn having a multistage stress relaxation function in which the elongation stress is transmitted to A) and the next crimped yarn (B) elongates while the crimp of the crimped yarn (A) resists the elongation stress. It is.

[0005] In addition, the bulky material is characterized by simultaneously mixing and entanglement of at least two kinds of thermoplastic synthetic fibers having a difference in elongation with a tensioned elastic yarn, and then false twisting, heat setting and untwisting. This is a method for producing an elastic yarn.

[0006] The bulky elastic yarn and the method for producing the bulky yarn can solve the problem of dangling of the bulky elastic yarn, and can remarkably improve the appearance quality of the product.

However, when the number of spindles and the number of processing machines that produce the bulky elastic yarn are increased, the incidence of defective yarns having peeling defects increases. It has been found that there is a problem that the incidence of defective yarns having peeling defects increases.

[0008]

SUMMARY OF THE INVENTION The problem of the conventional method for producing a bulky elastic yarn is solved, and the bulkiness which does not increase the rate of occurrence of defective yarns having defects due to multi-spindle or long-term aging is eliminated. An object of the present invention is to provide a method for producing an elastic yarn.

[0009]

In producing bulky elastic yarn,
It is possible to investigate the cause of the occurrence of defective peeling yarn due to multiplying and the cause of the generation of defective yarn with the lapse of time in long-term production, and to produce a bulky elastic yarn stably even with multiplication and over time. The invention of the means has been reached.

[0010] Thus, according to the present invention, the operation includes the steps of twisting an elastic yarn in a tension state and a thermoplastic inelastic yarn, mixing and entangled, then false twisting, heat setting and untwisting. In the method for producing a bulky elastic yarn, after heating the mixed fiber / entangled yarn in a non-twisted state on the circumference of a heated false-twisting area supply roller, false twisting is performed with the heating end point as a twisting start point. And a method for producing a bulky elastic yarn.

Further, according to the present invention, the elastic yarn and the thermoplastic inelastic yarn in the tensioned state are wound on the large-diameter portion of the stepped roller via the separate roller while the heating is performed while the yarn is being aligned. The separated small-diameter portion of the stepped roller is transferred and wound via a separate roller, and at this time, while both yarns transition from the large-diameter portion to the small-diameter portion, the yarns are mixed and entangled. A method for producing a bulky elastic yarn, characterized in that after heating on the periphery of the small diameter roller of the heated stepped roller, false twisting is performed using the heating end point as a twisting start point.

[0012]

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 schematic view of a process for explaining one embodiment of the present invention. First, the elastic yarn (1) is drawn through a guide (3) through an elastic yarn pre-stretching supply roller (5).
After pre-drawing between the drawing roller and the blending / entangled area supply roller (6), the elastic yarn in a tension state and the thermoplastic inelastic yarn (2) are combined and supplied to the mixed fiber area. Entangling nozzle (8) provided between roller (6) and false twist zone supply roller (9)
Mixed and entangled with.

The mixed and entangled yarn is supplied to a heated false twisting area supply roller (9), and is supplied to a separate roller (1).
0), is twisted by a false twisting tool (16), heat-fixed by a hot plate heater (15), untwisted, and unwound. ), And then wound by a winding device (19).

The elastic yarn used in the present invention is a block copolymer polyether / ester elastic yarn, a polyurethane yarn, a rubber yarn, a polybutylene terephthalate yarn or the like, and has an elongation of 200 to 200.
Although it has 900%, it is preferable to use a block copolymer polyether / ester elastic yarn from the viewpoint of heat resistance during false twisting, heat resistance of a product, and chemical resistance.

The fineness of the elastic yarn is 1 from the viewpoint of being used in combination.
0 to 200 denier is preferable, and 20 to 1 for clothing use.
00 denier is more preferable, and it may be a multifilament or a monofilament.

The pre-stretching of the elastic yarn is performed between the first roller (5) and the second roller (6) in order to improve the elastic recovery rate and position the elastic yarn at the core of the bulky elastic yarn. Do. The draw ratio is preferably 1.1 to 6.0 times, and if the elongation of the elastic yarn is reduced in advance by adjusting the spinning conditions and the like, the pre-drawing of the elastic yarn can be omitted. In that case, the supply amount (fineness) of the elastic yarn changes under tension,
Tension is applied according to the target supply amount, and a tension state is established.

On the other hand, the thermoplastic inelastic yarn is a bulky elastic yarn which is a crimped yarn and covers the core yarn elastic yarn. In the case of a single yarn, the low-orientation unspun yarn spun at 1000 to 2500 m / min. Drawn yarn or 2500-5000m / min
The highly oriented unstretched yarn spun in the above is used, but a highly oriented unstretched yarn having high heat resistance during false twisting, so-called POY, is preferable.

The thermoplastic inelastic yarn may be at least two kinds of multifilament yarns having a difference in elongation from the viewpoint of improving the covering property of the elastic yarn and preventing the peeling in the bulky elastic yarn. Is more preferred. The configuration of the two or more yarns is a combination of a low-oriented undrawn yarn spun at 1000 to 2500 m / min and a high-oriented undrawn yarn spun at 2500 to 5000 m / min, or 2500 to 4000 m
/ Min and highly oriented undrawn yarn spun at 4000 / min
A combination with a highly oriented undrawn yarn or drawn yarn spun at 0 m / min is preferred.

Further, at least two or more types of multifilaments having a difference in elongation may be combined at the time of spinning, and one creel of the original yarn at the time of false twisting can be omitted, thereby improving workability. The spun composite yarn is, for example, Japanese Patent Publication No. 2-804
No. 3, JP-A-4-194010 can be used.

The fineness of the thermoplastic inelastic yarn is preferably 1.5 to 20 times the fineness of the elastic yarn after pre-stretching from the viewpoint of covering the elastic yarn. 6 to 200 yarns are preferred from the viewpoint of coating with a non-elastic yarn, and in the case of a single yarn having no difference in elongation, a multifilament of 12 or more yarns is preferable.

As the thermoplastic inelastic yarn, a polyester fiber or a polyamide fiber is used. The method for producing a bulky elastic yarn of the present invention is suitable for a yarn comprising a fiber having a glass transition point higher than room temperature. In addition, the thermoplastic inelastic yarn may be added with a modifier, an antioxidant, a flame retardant, an antistatic agent, a fluorescent whitening agent, a coloring agent, a stabilizer, inorganic particles, etc. within a range that does not impair the purpose of the present invention. Or a yarn having unevenness in thickness, such as thick and thin yarn.

In the process shown in FIG. 1, in the process shown in FIG. 1, the air entangled nozzle (8) is formed by over-feeding the yarn between the roller (7) and the roller (9). ). As the air entangling nozzle, a conventionally known interlace nozzle, Taslan nozzle, etc. can be used,
In particular, an interlace nozzle is suitable. The overfeed rate of the yarn is preferably 0.5 to 10%, including the case where the tension of the elastic yarn is somewhat reduced, and usually 1 to 5% is more preferable. The pneumatic pressure is preferably 1 to 10 kg / cm ² , and usually 2 to 5 kg / cm ² is more preferably used. The number of entanglements to be applied is preferably 30 to 130 / m from the viewpoint of preventing the bulky elastic yarn from peeling.

In FIG. 1, a false-twist zone supply roller (9)
Is heated so that twisting by the false twisting tool (16) goes back to the supply roller (9) outlet (a). The heating temperature is preferably equal to or higher than the glass transition point of the thermoplastic inelastic yarn, and is equal to or higher than 70 ° C. in the case of a yarn made of polyethylene terephthalate fiber.

As in the conventional method, when the false twist is performed without heating the roller (8), the yarn is heated from the inlet (b) of the hot plate heater (15) for thermally fixing the false twist twist as shown in FIG. The twisting by the false twisting tool only goes back to the point (c) at which the yarn starts to plasticize, and the twisting does not go back substantially between (b) and (c). Rub the top and run. At this time, since the elastic yarn has a high coefficient of friction with the hot plate, if the processing machine is multi-weighted, if the roughness of the hot plate heater varies between weights, stick-slip will occur especially on fine surfaces. Causes unevenness in tension of stretch false twist, unevenness in stretch, false twist, and inferior peeling of bulky elastic yarn.
A similar problem arises. Further, when the roller (9) is not heated, the hot plate heater inlet (b)-
If the oil agent of the yarn accumulates as scum during (c), the friction between the elastic yarn and the scum increases, which also causes a stick-slip, which causes poor bulking of the elastic yarn. If the scum accumulation amount differs between the weights, a difference between the weights will occur.

On the other hand, when the heating roller (9) is heated, the yarn is plasticized by the heating roller, and the false twisting tool (16)
Twisting goes back to the heating roller outlet (a),
Unlike the above case where the supply roller (9) is not heated, the elastic yarn is twisted from the inlet (b) to the entire outlet (d) on the hot plate heater (15). It is moving and the yarn is rolling by twisting, and the friction between the hot plate heater (15) and the elastic yarn is no longer a problem. Even if it does, there is no occurrence of a defective defect rate of the bulky elastic yarn. Similarly, even if the scum is deposited between the weights in different amounts between the inlets (b) to (c) of the hot plate heater in the long-term processing, the bulky elastic yarn does not produce the defective defective peeling yarn. Moreover, since the yarn is twisted between (b) and (c) and is constantly rolling, the accumulation of scum does not proceed, and the processing can be performed more stably over time and between the weights.

The upper limit of the heating temperature of the supply roller (9) is limited by the heat resistance of the elastic yarn, and is preferably up to 140 ° C. for the block copolymer polyether / ester elastic yarn.

The number of windings on the heating roller (9) may be set as appropriate according to the desired amount of heat, and may be from 1 to 10 windings. Although there is a relationship with the temperature, it is more preferable that the number is 2 to 3 times or more from the viewpoint of plasticizing the thermoplastic inelastic yarn and 5 to 6 times or less from the viewpoint of preventing deterioration of the elastic yarn.

The supply roller (9) is preferably provided with a yarn presser roller (11) in order to prevent the recoil of the twist on the roller surface and to fix the twisting start point.

Next, the temperature of the hot plate heater (15) for heat fixing the twist is set to 100 ° C. or more in the case of a yarn made of polyethylene terephthalate fiber from the viewpoint of crimping the thermoplastic inelastic yarn. In order to prevent thermal deterioration of the elastic yarn, the temperature is preferably 220 ° C. or lower in the case of a yarn made of block copolymerized polyether / ester fiber.

The length of the hot plate heater (15) is
0.8 m or less is preferable, and 0.5 m or less is more preferable from the point of preventing the bulky elastic yarn from peeling. The lower limit of the length is preferably 0.05 m or more from the viewpoint of the crimp set, and 0.15
m or more is more preferable.

The length of the hot plate heater (15) is 0.8 m.
When the elastic yarn exceeds the limit, the elastic yarn that has once moved to the core of the yarn due to twisting tends to be squeezed out to the outer layer of the yarn again because of its easy-to-extend nature, and the bulky elastic yarn has a drawback defect. It will be easier.

As the false twisting device, a triaxial friction type disk false twisting device and a belt type friction false twisting device are preferable because the untwisting tension can be set to a low value and the speed can be increased. An air swirling nozzle type false twisting tool can also be used. When a triaxial friction type disk false twisting device is used, the surface speed of the false twisting device disk is set to 1.3 to 2.3 times the yarn speed, and usually 1.5 to 2.2 is preferable.

The winding device (19) may be a friction type cheese winding device. However, since the winding tension is different between both ends of the traverse and there is a danger that the bulky elastic yarn may be peeled off, the spindle winding device (19) may be used. It is preferable to take up as a pan using a take-up device. In addition, if the wrapping is performed on a pirn, a preliminary rewinding is not required for the subsequent twisting of the double twister or the like, so that there is no danger of causing poor peeling.

The false twisting method described with reference to FIG. 1 is applied by applying the false twisting method for false twisting an inelastic yarn proposed by the present inventors in Japanese Patent Application Laid-Open No. Hei 8-120533. can do.

FIG. 2 is a schematic view of a process for explaining another embodiment of the present invention. In FIG. 2, a separate roller (7) is added to the drawing roller for pre-drawing of the elastic yarn and the mixing / entangled area supply roller (6) in the process drawing of FIG. The purpose is to wind a tensioned elastic yarn and a thermoplastic inelastic yarn together with a separate roller (7) which rotates integrally with the mixed fiber / entangled area supply roller (6) in a state where the yarns are aligned. By turning the fibers, the fibers are blended and entangled after the two yarns are adapted to each other, whereby uniform mixing and entanglement are achieved.

That is, in the case of the process shown in FIG. 1, the elastic yarn in tension and the thermoplastic inelastic yarn are combined and supplied to the entanglement nozzle (8) by the supply roller (7). At this time, the elastic yarn is in a relatively tension state, and the inelastic yarn side is slackened by overfeeding, but there is no problem if the slack is uniformly mixed and entangled with the elastic yarn. When the bulky elastic yarn is manufactured by multiplying the weight, the slack of the inelastic yarn is unevenly mixed with the elastic yarn due to the air flow discharged from the entanglement nozzle (8) to the supply roller (7).・
Entangled weights may also occur. In such a case, the bulky elastic yarn has a drawback defect.

In order to reliably avoid the risk that the slack of the inelastic yarn is unequally mixed with the elasticity or the like, the two yarns are unified before being supplied to the entanglement nozzle (7). It is advisable to supply the entangled nozzle (8) after it has been adjusted to a certain alignment state. The number of windings around the roller (6) and the separate roller (7) is 1 to 5 times, and preferably at least 2 times.

FIG. 3 is a schematic view of a process for explaining another embodiment of the present invention. The relationship with FIG. 1 is as follows: the elastic yarn stretching roller / mixing / entanglement area supply roller (6), the separate roller (7), the false twist area supply roller (9), and the separate roller (10) are stepped rollers (12). And a separate roller (13).
The fiber mixing / entanglement nozzle (8) is provided during the transition from the large diameter portion to the small diameter portion in 2).

With this stepped roller system, the elastic yarn in tension and the thermoplastic inelasticity are wound together around the large-diameter portion of the stepped roller via a separate roller in a state where the combined yarn is aligned and aligned.
After being transferred and wound to the small diameter portion of the stepped roller via a separate roller, the two yarns are adapted in a aligned state, and then, while both yarns are transitioning from the large diameter portion to the small diameter portion, the yarns are evenly distributed. Can be mixed and entangled. At this time, the stepped roller (12) is heated, and after the fiber mixing and entanglement, false twisting is performed in the same manner as in the method for producing a bulky elastic yarn described with reference to FIG.

For the heating of the stepped roller (12), the necessity of the present invention necessitates that only the small-diameter portion be heated positively, and it is easier to operate the large-diameter portion together. You may do so. In the case of a stepped roller system, since the distance between the mixed fiber and the entangled area is short, the mixed fiber entanglement becomes more uniform, and the apparatus can be made compact to improve workability.

[0041]

EXAMPLES Evaluation of peeling was performed by the following method. With a plain weave design, the warp has a regular polyester filament of 100
The denier / 36 filament non-twisted yarn is 100 yarns / inch, and the weft yarn is subjected to additional twisting of 150 T / M on the bulky elastic yarn to be evaluated, and then driven at a density of 80 yarns / inch, and woven for 10 cm width per evaluation yarn. did. Subsequently, the greige was scoured according to a conventional method of dyeing polyester filament fabric.
° C × 30 minutes, preset 180 ° C × 45 seconds, high pressure dyeing 1
The fabric was treated at 30 ° C. for 45 minutes and final set at 160 ° C. for 45 seconds, and contracted 5% in the warp direction and 10% in the weft direction to obtain a woven fabric. This woven fabric is cut for each evaluation yarn,
It was stretched by 0% and stretched by 20% in the weft direction, and the appearance was determined as the appearance of the peeling (the coating of the elastic yarn was poor and the elastic yarn appeared on the fabric surface). Of the bulky elastic yarns evaluated, the rate of occurrence of those that did not cause a practical defect was expressed as the yield rate.

Examples 1 to 5 and Comparative Examples 1 to 4 As an elastic yarn, a block copolymerized polyetherester unstretched monofilament (20 denier) having polybutylene terephthalate as a hard segment and polyoxybutylene glycol as a soft segment was used. , And an elongation of 600%) and guide the elastic yarn (1) by the process of FIG.
Between the rollers (5) and (6)
The stretched double-stretched elastic yarn and a non-stretched spun mixed yarn obtained as a thermoplastic inelastic yarn by the method described in JP-A-4-194007 (a polyester multifilament 50 denier 24 filament having an elongation of 300%) And a polyester multifilament having a elongation of 200% and a denier of 50 denier and 12 filaments and a mixture of 100 denier and 36 filaments), and the interlace nozzle (8) provided between the roller (6) and the roller (9) is used for over-threading. The fibers were mixed and entangled at a feed rate of 2% and a pneumatic pressure of 2 kg / cm ² (the number of entanglements was 80 pieces / m).

The mixed and entangled yarn is wound four times around a heated roller (9) via a separate roller (10) and heated, and then the friction false twist device (16)
(Surface speed of friction disk / yarn speed = 1.8
5), hot plate heater (15) (length 20 cm, temperature 20)
0 ° C.), false twisting, heat setting, and untwisting are performed using the end point of heating by the heating roller (10) as a twisting start point, and 400
The take-up roller (17) was taken up at a speed of m / min, and the bulky elastic yarn 75 denier 37 filaments was wound up as a 3 kg cheese using a wind-up device (19).

At this time, the temperature of the heating roller (10) is shown in Table 1.
As shown in the figure, the workpiece was processed by changing nine levels from room temperature (25 ° C.) to 160 ° C. The processing machine is 156 spindles / unit.
It was used for one month and produced for one month. The dipping was evaluated for the first doff 156 cheese, the doff 156 cheese on the 15th day, and the doff 156 cheese on the 30th day, and the total of 468 cheeses was evaluated and expressed as a non-defective rate. In Table 1, in Examples 1 to 5, the peeling defect was small and the non-defective product rate was secured at 99% or more, whereas in Comparative Examples 1 and 2, the non-defective product rate was as low as 93% or less. Further, in Comparative Examples 3 and 4, an increase in breakage was observed from the viewpoint of heat resistance of the elastic yarn.

[0045]

[Table 1]

Embodiment 6 In the same manner as in Embodiment 2,
At the time of processing, the elastic yarn and the thermoplastic inelastic yarn which are in a tension state are adapted by winding four times between the roller (6) and the separate roller (7) which rotates integrally in the process of FIG. The processing was performed in the same manner as in Example 2 except for these conditions. In this case, the non-defective product rate is 99% in Example 2.
% To 99.5%.

[Examples 7 to 11, Comparative Examples 5 to 8] As the elastic yarn, a block copolymerized polyetherester unstretched monofilament (20 denier) using polybutylene terephthalate as a hard segment and polyoxybutylene glycol as a soft segment was used. The elongation of the elastic yarn (1) through the guide (3) and the large-diameter portion (diameter: 91.8 mm) of the roller (5) and the stepped roller (12) by the process of FIG. Stretched 2.0 times between
As the elastic yarn in tension, as a thermoplastic inelastic yarn,
Unstretched spun blended yarn obtained by the method described in JP-A-4-194007 (polyester multifilament 50% denier 24 filament with 300% elongation and elongation 200)
% Polyester multifilament 50 denier, filament mixed yarn 100 denier 36 filament)
And the small diameter portion (90.0 mm in diameter) of the heated stepped roller while being wound four times via a separate roller around the large diameter portion of the stepped roller (12) in a twined yarn aligned state. And then wound four times through a separate roller. At this time, while both yarns are moving from the large-diameter portion to the small-diameter portion, the yarns are interlaced using an interlace nozzle, with an overfeed rate of 2% and a pneumatic pressure of 2 kg. / Cm ² mixed fiber / entangled (entangled 74
/ M) and subsequently heated on the circumference of the roller at the small diameter portion of the heated stepped roller, and then subjected to a friction false twisting device (16) (the surface speed of the friction disk / the yarn speed = 1.9). Using a hot plate heater (15) (length: 20 cm, temperature: 200 ° C.), false twisting, heat setting, and untwisting are performed using the heating end point of the heated small diameter portion of the stepped roller as the twisting start point, and 400 m The yarn was taken up by a take-up roller (18) at a speed of / min, and the bulky elastic yarn 75 denier 37 filaments were wound up as a 2.8 kg pan using a wind-up device (20).

At this time, as shown in Table 2, the temperature of the small diameter portion of the step roller (12) was changed from room temperature (25 ° C.) to 160 ° C. by nine levels. In addition, the processing machine uses one machine with 160 spindles / unit and produces it for one month.
Drilling was evaluated for 60 pans, a doff of 160 pans on the 15th day, and a total of 480 pans of the doff 160 pans on the 30th day. In Table 2, Examples 7-1
In Comparative Example 5 and 6, the non-defective rate was 98.5% or more, while in Comparative Examples 5 and 6, the non-defective rate was 93.
% Or less. Further, in Comparative Examples 7 and 8, an increase in breakage was observed from the viewpoint of heat resistance of the elastic yarn.

[0049]

[Table 2]

[Examples 12 to 17, Comparative Examples 9 to 12] In the process of FIG.
Processing was performed in the same manner as in Example 8, except that the level was changed by 10 levels between 01 m and 1.2 m. As a result, as shown in Table 3, in Examples 12 to 17, the non-defective rate was 98%.
On the other hand, in Comparative Examples 9 and 10, the non-defective product rate was 97% or less and the crimp rate was low. Comparative Example 1
In Nos. 1 and 12, the yield rate was as low as 96% or less.

[0051]

[Table 3]

[0052]

According to the present invention, in producing a bulky elastic yarn obtained by coating an elastic yarn at a crimp rate, extreme tension fluctuations of the elastic yarn and the thermoplastic inelastic yarn can be prevented. It is possible to provide a method for producing a bulky elastic yarn which does not increase the rate of occurrence of defective yarns having peeling defects even if the length of the yarn is increased or the length of time is long.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a yarn processing apparatus for carrying out the present invention.

FIG. 2 is a side view showing an example of a yarn processing device for carrying out the present invention.

FIG. 3 is a front view showing an example of a yarn processing device for carrying out the present invention.

[Explanation of symbols]

1: Elastic yarn 2: Thermoplastic inelastic yarn 3: Guide 4: Guide 5: Elastic yarn pre-stretch supply roller 6: Stretch roller / mixing / entangled area supply roller 7: Separate roller 8: Entangled nozzle 9: False twist area Supply roller 10: Separate roller 11: Press roller 12: Step roller 13: Separate roller 14: Press roller 15: Hot plate heater 16: False twister 17: Pull roller 18: Pull roller 19: Winding device (cheese winding) 20: Winding device (pan winding) a: Exit of supply roller (9) b: Inlet of hot plate heater (15) c: Point where yarn starts to plasticize when supply roller (9) is not heated d: Heat Exit of plate heater (15)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Akio Kimura 3-4-1, Amihara, Ibaraki-shi, Osaka Teijin Limited Osaka Research Center

Claims (6)

[Claims] 1. A method for producing a bulky elastic yarn including an operation of combining a tensioned elastic yarn and a thermoplastic inelastic yarn, blending and entangled, then false twisting, heat setting and untwisting. In the non-twisted state, the mixed fiber / entangled yarn is heated on the circumference of the heated false twisting area supply roller, and then the twisting is performed with the heating end point as the twisting start point. For producing bulky elastic yarns. 2. The method for producing a bulky elastic yarn according to claim 1, wherein the temperature of the false twisting area supply roller heated in a non-twisted state is 70 ° C. to 140 ° C. 3. A separation roller which rotates integrally with a mixing / entanglement area supply roller in a state where a tensioned elastic yarn and a thermoplastic inelastic yarn are aligned before the mixing / entanglement. The method for producing a bulky elastic yarn according to claim 1 or 2, wherein both yarns are adapted to each other by winding the yarn. 4. The heated stepped roller is wound around a large-diameter portion of the stepped roller via a separate roller while the elastic yarn in tension and the thermoplastic inelastic yarn are aligned in a combined state. The small-diameter portion is wound by transfer via a separate roller. At this time, while the two yarns move from the large-diameter portion to the small-diameter portion, the yarns are mixed and entangled. Heating on the circumference of the small-diameter roller, and then performing false twisting using the heating end point as a twisting start point. 5. The temperature of the heated stepped roller is 70 ° C. or more.
The method according to claim 4, wherein the temperature is 140 ° C. 6. The heat setting of the yarn during false twisting with a length of 0.
The method according to claim 1, wherein the heating is performed using a hot plate heater having a length of from 0.05 m to 0.8 m.
The method for producing a bulky elastic yarn according to 2, 3, 4 or 5.