JPH05230707A - Spinning assembly - Google Patents

Abstract

PURPOSE:To provide a spinning assembly designed to give stable, uniform elastic yarns by applying uniform false twist rotation on elastic fiber filament yarns along with uniformly imparting the yarns with a liquid finish. CONSTITUTION:In the process for producing elastic fiber filament yarns, the quality of the filament yarns can markedly be improved by introducing part of a finishing lubricant into a false twister to provide uniform twists with an oiling device as a proper guide system. With this spinning assembly, spinning operability can also be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinning device for false twisting a fiber yarn and applying a finishing agent to the fiber yarn.
In particular, the present invention relates to a spinning device suitable for spinning a yarn having specific properties typified by polyurethane-based elastic fibers and spinning instability.

[0002]

2. Description of the Related Art In a spinning machine for synthetic fibers, smoothness is imparted to prevent damage due to rubbing of yarns,
It is well known to add a finishing agent such as oil (oil agent) to the yarn to facilitate the subsequent handling. Further, it is also known to twist the spun yarn upstream of the finish applying device in the yarn running direction. Figure 2
The outline of the spinning device is shown in FIG. The melt or solution of the yarn forming material is supplied from the liquid conduit 12 and extruded from the spinning nozzle 14 into the spinning tube 15. Hot air or cold air is introduced into the spinning tube 15 from an inlet 13 of hot air or cold air, and is discharged from an outlet 16 to promote the yarn formation of the extruded yarn forming liquid. The yarn from the slit in the lower part of the spinning tube is false twisted by the false twisting device 17 at the lower part thereof, and then the finishing agent is applied by the finishing agent applying device 18, and is wound by the first roller 19 or the direction is changed. Then, it is finally wound up.

[0003]

In the above-mentioned conventional spinning device, when the false twist is applied to the yarn by a whirling flow of gas or mechanical whirling in the false twisting device, the yarn is false twisted. At the same time, it comes into contact with the solid surface of the false twisting device. Due to this false twisting, contact with the solid surface, etc. of the yarn, fluctuations in running frictional resistance occur, and this fluctuation causes unstable yarn formation, that is, complete yarn formation immediately after leaving the spinning nozzle. Affects unfinished stages and causes phenomena such as thread runout and plucking,
As a result, the homogeneity of the formed yarn is adversely affected, and eventually even the yarn breakage occurs.

[0004]

SUMMARY OF THE INVENTION The present invention provides a spinning device for solving the problems of the conventional spinning device described above and for obtaining a uniform yarn. That is, the present invention is a spinning device in which a spinning nozzle, a false twisting device, and a finishing agent application device are arranged in this order along the yarn running direction, and a part of the finishing agent to be applied to the yarn by the finishing agent application device. Are distributed to a false twisting device and are supplied to the false twisting device, and the false twisting device in the spinning device is a device having a false finish part and a finish finish part, and the finish finish part Has a groove portion having a narrowest groove portion which serves as a yarn contact portion, and the yarn contact portion and at least 3 mm above the yarn contact portion are formed of a porous body. .. Furthermore, in the present invention, the finishing agent applying device in the spinning device has an apex serving as a yarn-contacting part, and an upper slope and a lower part that retreat from the apex at an angle with respect to a vertical line (of the yarn). It has a groove having at least a slope, and the surface roughness of at least the apex is 2
The spinning device is characterized by having S to 10S.

In the skeleton of the present invention, a part of the finishing agent is supplied also to the false twisting device, the fluctuation of the friction resistance of the yarn at the time of false twisting is minimized, and then the remaining finishing agent is added to the yarn. The present invention provides a spinning device for obtaining a yarn in which a necessary amount of finishing agent is applied and the yarn quality is uniform (small fluctuation and small variation). The finishing agent used in the present invention is not particularly limited, but a lubricant, an oil, an antistatic agent, a softening agent, a water repellent, a hydrophilizing agent,
Examples include solutions such as surfactants and emulsions. All of these are liquid, and when the liquid is applied to the yarn, the yarn has a lower frictional resistance than when the yarn is in direct contact with the solid, and the frictional resistance during processing represented by false twisting. It contributes to reduce the fluctuation of.

The spinning apparatus to which the present invention is applied is a melt spinning apparatus or a dry spinning apparatus. The yarn material (polymer) to which the spinning device of the present invention is applied is not particularly limited,
Examples thereof include polyester, polyamide, polyurethane, fibrin acetate, and polyolefin, but particularly preferably applied is represented by a polyurethane elastic fiber,
It is an elastic yarn having a remarkably large value of elongation. Less than,
The present invention will be described with reference to a spinning device using a polyurethane elastic yarn as an example.

A case of spinning using a solution containing polyurethane (or polyurethane urea) as a main component will be described. As an example of the spinning apparatus shown in FIG. 2, the liquid is supplied from a liquid conduit 12 and extruded from a spinning nozzle 14 into a spinning cylinder 15. In the spinning cylinder,
Warm air (heated body of air or nitrogen) is introduced from the warm air inlet 13 and discharged from the warm air outlet 16, which evaporates the solvent of the solution and promotes filament formation. The extruded liquid passes through a spinning tube, is false twisted by a false twisting device, and is given a finishing agent by a finishing agent applying device.
The direction is changed by a roller, and it is wound into a package or the like by a rear winder (not shown). When the yarn 3 is false twisted by the false twisting device 17, as shown in an enlarged view of FIG. 1, the false twisting device causes vibration (swirl) like a continuous balloon (ribbon shape) from the false twisting device. The filaments are formed near the upper spinning nozzle 14, and at the time when the ribbon-shaped formation is started (near the nozzle), a plurality of single yarns are fused and a combined yarn is formed.
The state of the illustrated yarn 3 is an apparent state, in which the single yarns are not separated into ribbons, but the combined single yarns are vibrating. ..

The false twisting device of the present invention has a structure as shown in FIG. 1 as an example, and comprises a false twisting part 2 and a finishing agent part 1 and is introduced into the false twisting device. The formed yarn 3 enters the groove (slit) portion 4 of the finishing agent portion 1, and the groove portion has the narrowest portion 9, and this narrowest portion and 3 mm above it are formed by at least the porous body 7. The non-penetrating material 5 is formed so as to surround the porous body, the finishing agent reservoir 8 is provided between the non-penetrating material and the porous body, and the finishing agent is supplied from the finishing agent supply hole 6. The finishing agent leached from the finishing agent reservoir 8 forms a liquid film of the finishing agent on the surface of the groove, and the finishing agent is applied to the yarn.

The yarn to which the finishing agent has been applied by passing through the groove portion of the finishing agent portion then enters the false twist portion 2 formed by combining with the finishing agent portion, and is false twisted. It In the present invention, the false twisting portion is not a specific one, and may be a conventionally known false twisting device, for example. In this example, the false twist portion 2 has a gas introduction hole 10 that is opened in the tangential direction of the yarn conduit 11, and the gas introduced from this 10 enters 11 and becomes a swirl flow. However, the yarn is introduced into the yarn conduit of the false twist portion, and thus false twisted by the swirling flow. In this example, the groove 4 is preferably an inverted conical tube. Furthermore, the porous body in this example is
It is preferably formed of particles having a particle size of 0.5 to 10 μm, and the diameter of the porous fine pores is 0.1 to 10 on average.
μm, preferably 0.5 to 2.0 μm in average diameter,
More preferably, the occupation ratio of the pores having the pore diameter of 0.6 to 1.5 μm is 95% of all the pores.

The material of the particles forming the porous body is not particularly limited, but examples thereof include ceramics such as silicon oxide, aluminum oxide, zirconium oxide, silicon carbide, silicon nitride, aluminum nitride, boron carbide and the like. Or a mixture of glass, a high molecular polymer (for example, crosslinked polystyrene, polystyrene, polyurethane, etc.), stainless steel, titanium, and the like. The false twisting device shown in this example is a preferable example, and the present invention is not limited to this example. As shown in this example (FIG. 2), the finishing agent part and the false twisting part are directly connected and united. Not only the one but also one and two may be connected by a conduit having a large diameter or the like, or one and two may be arranged with a distance so that they can slide. Of course, due to the operation of the present invention, the finishing agent portion 1 may be arranged upstream of the false twist portion 2 in the yarn traveling direction (the arrow direction in FIG. 2) (the opposite side of the arrow direction). Preferably, both parts are united.

In the spinning device, which is the essence of the present invention and is required to distribute and supply the finish agent to be applied by the finish agent applying apparatus to the false twisting apparatus, the total amount of the finish agent applying predetermined amount of false twisting apparatus The distribution ratio is preferably 0.05 to 0.5, more preferably 0.1 to 0.5.
It is 0.4.

The finishing agent applying device installed downstream of the false twisting device used in the spinning device of the present invention in the yarn running direction is not particularly limited, and may be one known as a roller system or a guide system. Good. However, in order to further enhance the effect of the present invention, the following device is preferable as the finishing agent applying device. That is, it has a groove having at least an upper slope and a lower slope having an apex serving as a yarn contact portion and receding from the apex at an angle with respect to the vertical line of the yarn, and the surface of the apex. A finishing agent application device having a roughness of 2S to 10S.

Further, the finishing agent applying device suitably used in the present invention will be specifically described. The guide part, which is the main part of the preferred finish applying device of the present invention, will be described below with reference to the drawings. The finishing agent applying device of the present invention comprises the guide portion as a main part, and further comprises a finishing agent feeding pump and other feeding device, a portion for collecting an excessive finishing agent from the guide portion, and the like. In FIG. 3, reference numeral 23 denotes a guide portion, and the guide portion has 22 groove portions, and the cross-sectional shape of the groove portion (groove) is not particularly limited, and a trapezoidal shape in which one surface is released. However, it may be a circle with a partial lack (released). An opening 21 for supplying the finishing agent is provided in a part of the groove, and the opening communicates with the finishing agent supply hole 20.

The groove portion 22 is not particularly limited in its depth, but in the depth direction (the yarn 3
No.) vertical line (this vertical line defines the guide portion as shown in FIG. 4 etc., and the yarn may coincide with this vertical line, and the yarn may fall within the angle α, β, that is, the vertical line. May run between each of the slopes and the slopes.), And has a vertex portion 27 (FIG. 4) that comes into contact with the yarn, and from the vertex portion 27 in the depth direction with respect to the vertical line of the yarn. Angle (α, β in Fig. 4)
It has an upper slope 25 and a lower slope 26 that retreat. The apex portion 27 is rounded with a small radius, and at least the apex portion has a surface roughness of 2S to 10S. It is important that the threads make contact at the guides only at this apex, and therefore the angle α,
Although β is not limited, a preferable range is an angle of 15 ° to 70 °. Moreover, as shown in FIG. 4, the position of the opening 21 in this groove is from the top to the opening 2
It is more preferable that the shortest distance dH to 1 is 3 mm or more and is above the yarn running direction, and the shortest distance dL in which the aperture position is separated from the yarn perpendicular 3 is 2 mm or more. Is.

In a preferred embodiment of the present invention, the groove 22 has a trapezoidal cross section, and has a V shape with an angle γ from above toward the narrowest portion 24 near the apex 27. The shape is narrowed in a letter shape and widens downward with an angle δ (FIG. 3). The side wall 28 of the groove portion is opposed to form a groove with the upper slope and the lower slope, but the side wall 28 may not be clearly present as in the case of a circular cross section. In the guide of the present invention, a sub-groove (not shown) having a smaller width and depth than the groove is attached to the lower slope 26 of the groove 22, and the sub-groove extends to the lowermost end of the lower portion, The portion may be formed as a tip of a lead, and excess finishing agent may be dropped, and the dropped liquid may be received by a pipe and collected. The angles of γ and δ described above are not particularly limited, but are preferably 20 ° C to 50 °.

[0016]

EXAMPLES The present invention will be specifically described with reference to the following examples, but the present invention is not limited to these examples. Example 1 Polytetramethylene ether glycol having hydroxyl groups at both ends and having a number average molecular weight of 2000 and 4,4′-diphenylmethane diisocyanate were reacted at a molar ratio of 1: 2 to produce a pole polymer, and then 1,2 Chain extension with polypyrylenediamine, 2000 poise (30 ° C) at a polymer concentration of 30% (solvent dimethylformamide)
A polyurethane solution having a viscosity of An antioxidant, an ultraviolet absorber and a gas yellowing inhibitor were added to this solution and mixed and stirred to obtain a spinning dope. After defoaming the spinning dope thus obtained, a hot spinneret having a dry hot air temperature of 180 ° C. and a spinning speed of 70 was used using a spinneret having five orifices each having a diameter of 0.2 mm.
Dry spinning was performed at 0 m / min to obtain a filament of 37.1 denier. At this time, the false twisting device (the one having the shape shown in FIG. 1 was used) was composed of a sintered body of silicon oxide, the average diameter of the pores was 1.5 μm, and the surface roughness was 5 μm.
Finishing agent is applied so as to be 2% owf, and then a final oiling agent applying device using a guide (having the shape shown in FIGS. 3 and 4) is used so that the final adhesion rate becomes 6%. Adjusted to. The uniformity of the elastic yarn obtained at this time was measured by Eve Nestester KET80C manufactured by Keiki Kogyo Co., Ltd. and evaluated by U%. The strength and elongation characteristics were measured by Tensilon UTM-III type manufactured by Orientec Co., Ltd. The spinning operability was adjusted by the number of yarn breakages per 120 hours. (The results are shown in Table 1 below.) Comparative Example 1 In Example 1 above, the polymer synthesis and spinning conditions were the same, and the false twisting device was a conventional dry type twisted product (oil application amount was 0%. ) Was used and an oiling roller (the amount of oil applied was 6%) was used as a finishing agent applying device. The false twist was more unstable than that of the example, so that the U% value was high, and the unevenness of the finish was also generated, resulting in a poor quality product. It was also confirmed from the observation that the oscillation of the yarn during spinning was larger than that in the example. Comparative Example 2 In the above-described Example 1, the polymer synthesis and spinning conditions were the same, the false twisting device was also the twisted body (false twisting device) of Example 1 of the present invention, and the oiling roller was used as the finishing agent applying device. I wound it up. The amount of oil applied was 0% with the false twisting device and 6% with the finishing agent applying device. Although the false twist is stable and the U% value is stable as compared with the examples,
The uneven adhesion of the finishing agent was observed, and as a result, the number of yarn breakages tended to increase as compared with the examples. The evaluation results of Examples and Comparative Examples are shown in Table 1 below.

[0017]

According to the present invention, the following outstanding effects can be obtained. (1) By using the improved false twisting device, stable twisting can be performed, and the running yarn can be stably wound up by suppressing twisting motion due to false twisting. (2) The quality of the elastic yarn can be improved and
Operability can also be improved.

[0018]

[Table 1]

[Brief description of drawings]

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

FIG. 2 is a schematic view showing an example of a spinning device.

FIG. 3 is a schematic view showing a main part of an example of a finishing agent applying device of the present invention.

FIG. 4 is a schematic view showing a main part (guide part) of an example of the finishing agent application device of the present invention.

[Explanation of symbols]

 1: Finishing agent part 2: False twisted part 3: Perpendicular line 4: Groove part 5: Non-penetrating material 6: Finishing agent supply hole 7: Porous body 8: Finishing agent reservoir 9: Narrowest part 10: Gas introduction hole 11: Thread Strip conduit 12: Liquid conduit 13: Warm air inlet 14: Spinning nozzle 15: Spinning cylinder 16: Warm air outlet 17: False twisting device 18: Finishing agent applying device 19: Roller 23: Guide part 27: Apex part

Claims (3)

[Claims] 1. A spinning device comprising a spinning nozzle, a false twisting device, and a finishing agent application device arranged in this order along the yarn running direction, wherein the false twisting device comprises a finishing agent application section (finishing agent section). A spinning device characterized by having. 2. The false twisting device according to claim 1, wherein the false twisting device also has a finishing agent portion together with the false twisting portion, and the finishing agent portion has a narrowest groove portion to be a yarn contacting portion. A spinning device having a groove portion, wherein the yarn contacting portion and at least 3 mm above the yarn contacting portion are formed of a porous body. 3. The finishing agent applying device according to claim 1, wherein the finishing agent applying device has an apex serving as a yarn contacting portion, and has at least an upper slope and a lower slope that recede from the apex at an angle with respect to a vertical line. It has a groove and the surface roughness of at least the apex is 2S to 10S.
A spinning device characterized in that