JPH0718051B2 - Method for producing fine-fine viscose rayon filament yarn - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a viscose rayon filament yarn which has a fine single yarn fineness which has never been obtained and has a small number of fluffs. More specifically, the present invention relates to a method for producing a viscose rayon filament yarn capable of providing a woven or knitted fabric having an excellent texture.

(Prior Art) Generally, the texture of a final product such as a woven fabric or a knitted fabric using a yarn composed of a fine-fineness monofilament, which is generally referred to as a high count yarn in the industry, is obviously soft and has a distinctive characteristic. Therefore, it is a well-known fact that it can be sufficiently differentiated as a high value-added product.

In the viscose rayon filament field as well, various researchers have made various research and development in the past in an attempt to spin a yarn composed of a monofilament having a finer fineness. Compared to conventional yarn with single yarn fineness of about 5 denier and conventional yarn with multi yarn with single yarn fineness of about 3 denier in terms of fluff that occurs when some filaments of the yarn are cut. And it was in a very inferior position.

In the development process, paying attention to the draft (that is, the ratio of the yarn winding speed of the godet roller to the discharge speed of the nozzle hole of viscose) that rises with the increase in the number of high-count yarns, and the draft is increased by decreasing the spinning nozzle hole diameter. Hold,
Attempts have been made to spin high-count yarns in a stable manner, but the spinnability is improved due to clogging of the nozzles due to free fibers (that is, undissolved fibrin) present in viscose or gel particles generated over time. The above object was not achieved because the fiber was extremely unstable, and yarn breakage or fluffing was remarkable. Of course, although fine filtration of viscose, which has been developed by many filter media, has been studied at the same time, a large problem occurs due to clogging or regeneration of the filter media, and as a result, it is a high-count product that is widely distributed in the market. The spinning of the yarn was unsuccessful.

(Problems to be Solved by the Invention) An object of the present invention is to solve the above-mentioned defects in production and quality of viscose rayon filament yarn, and to viscose rayon that is stably composed of fine fineness monofilament. It is to provide a method for manufacturing a filament yarn.

(Means for Solving Problems) The inventors of the present invention have made a detailed analysis on the spinning phenomenon of the fine-fine viscose rayon filament yarn, and as a result of intensive studies, finally, the tension applied to the yarn at the time of spinning was determined. By controlling it, it has succeeded in spinning a viscose rayon filament yarn composed of a fine-fineness monofilament, which has unprecedentedly good spinnability, extremely few fluffs, and good yarn quality. That is, according to the present invention, the viscose rayon spun from the spinning nozzle N is passed through the yarn guide A1 and the coaxial different diameter godet rollers G1 and G2 having a smaller diameter are used.
2, the rotating roller R, the large diameter godet roller G1 in this order, then through the yarn guiding guide A2, and at the time of winding into a pot, at least an angle is imparted to the traveling yarn by the yarn guiding guide A1, so that the rotating roller R And tension applied to the running yarn from the godet roller G1 to 0.05-0.5g /
A method for producing a fineness viscose rayon filament yarn having a single yarn fineness of 2 denier or less and a number of fluffs of 7/10 ⁶ m or less, characterized by denier, and spinning from a spinning nozzle N. Guide the viscose rayon to Godet Roller G, Nelson Roller R2, Nelson Roller R1 in this order, and continue to Nelson Roller R2.
When winding after traveling between the godet roller G and the godet roller R2, the tension applied to the running yarn from the godet roller G to the godet roller R2 is 0.05 to 0.5 g due to the peripheral speed difference between the godet roller G and the Nelson roller R2. / Single denier of 2 denier or less and 7 fluff
This is a method for producing a fineness viscose rayon filament yarn having a number of 10 ⁶ m or less.

The "tension" in the present invention means the tension measured at the portions marked with X in Fig. 1 (front view) and Fig. 2.

The fine fineness viscose rayon filament yarn referred to in the present invention is the lowest monofilament fineness yarn among the viscose rayon filament yarns that have been found in the market so far, that is, 75 denier / 33 filaments = 2.3 denier / thinner 2.0 It is a viscose rayon filament yarn having a denier or less, preferably 0.5 to 1.9 denier, more preferably 0.9 to 1.6 denier. Due to such a single yarn fineness, when it is made into a woven fabric or a knitted fabric, it has a soft texture which is not present in the conventional viscose rayon filament yarn.

Further, the viscose rayon filament yarn of the present invention,
The number of fluffs is 7/10 ⁶ m or less, and the number of fluff is extremely small. That is, an ordinary viscose rayon filament yarn is not used as a spun yarn such as a parlock, but is subjected to various post-treatments used as a filament, for example, cone-up, rough winding, sizing, twisted yarn, A fluff level of "10 fibers / 10 ⁶
m ”or less. In the present invention,
More preferably, the number of fluffs is 2/10 ⁶ m or less. Here, the number of fluffs means the number of fluffs of cheese or corn obtained by spinning, and for example, it is detected by a fluff counter when unwinding them during use.

Next, the tension applied to the yarn during spinning, the spinnability, and the occurrence of fluff, which are important points in the method for producing a viscose rayon filament yarn of the present invention having such fineness and less fluff, will be described.

In the currently employed spinning method, as shown in the representative example in FIG. 3, the yarn which is in a state of insufficient strength due to insufficient coagulation and regeneration immediately after being discharged into the coagulation bath is a guided yarn. Godet rollers G1 and G2 while receiving strong frictional resistance at the guide
After being given a stretch of 5 to 30%, it is rolled into a pot as a cake. For this reason, the sulfur compound or free sulfur that is inevitably generated during spinning of viscose rayon yarn is deposited on the yarn path of the yarn guide, friction resistance increases, and yarn breakage and fluff increase rapidly. . This is
High-draft spinning and high count yarns composed of fine filaments are more susceptible to damage, and stable spinning is virtually impossible.

In developing the manufacturing method of the present invention, focusing on the frictional resistance of the yarn guide, the relationship between the tension (maximum tension) T applied to the yarn at the yarn guide position and the spinnability and fluff is shown in FIG. It was measured in detail by the spinning method. The spinning conditions are
75 denier / 60 filament, coagulation bath (H ₂ SO ₄ 125 g / 1 Zn
SO ₄ 13g / 1 Na ₂ SO ₄ 270g / 1 bath temperature 50 ° C), spinning speed 130
Spinning was performed while controlling the tension T by changing the draw ratio between the godet rollers G1 and G2 and the yarn contact angle at the yarn guides A1 and A2 under the spinning conditions of FIG.

The correlation between the measured value of the tension immediately after the yarn guide A2 to which the maximum tension is applied and the spinnability and the fluff is as shown in Table 1.
When the value was more than 0.5 g / denier, there were many yarn breakages and fluffs and there was no workability. On the other hand, when the tension T was in the range of 0.5 g / denier and 0.25 g / denier, the spinnability was satisfactory,
The fluff was 6.1 filaments / 10 ⁶ m, and the quality as a thread was slightly deteriorated. Further, in the range where the tension T was less than 0.25 g / denier and 0.05 g / denier or more, the yarn breakage and the fluff were 0.02 times / 24 hours, and the good results were 1.2 yarns / 10 ⁶ m.

On the other hand, when the tension is less than 0.05 g / denier, the drawing is insufficient and the running yarn is liable to be slackened, resulting in many yarn breakages, resulting in extremely poor operability.

As is clear from this, in order to produce a viscose rayon filament yarn of 2.0 denier or less while suppressing the generation of fluff, in the wet spinning method of viscose, the viscose discharged from the spinning nozzle is solidified and regenerated. It is necessary to set the tension applied to the yarn in the interval, that is, at the position of the X mark in FIGS. 1 and 2 to 0.05 to 0.5 g / denier.

The tension is measured at the X mark in FIG. 3, and the maximum tension in the yarn guide is measured.

The tension adjustment for the purpose of reducing the frictional resistance of the yarn guide to the maximum is performed by the draw ratio applied to the yarn and the contact angle of the yarn in the yarn guide. As the yarn guide, a fixed guide, a rotary roller guide, or the like can be used, and when sufficient tension adjustment cannot be made only by the contact angle of the yarn in the guide, the fixed guide is placed at the same position instead of the fixed guide. It is possible to use a rotating roller guide or a positive drive roller as shown in FIG.

A typical manufacturing method of the present invention will be described with reference to FIGS.

FIG. 1 shows a spinning method of the viscose rayon filament yarn of the present invention. The viscose rayon spun from the spinning nozzle N passes through a yarn guide A1, a small roller G2 of a coaxial different diameter godet roller, a rotating roller R, a large roller G1 of the godet roller, and a yarn guide A2, It is introduced into the pot P. In this case, the stretching is performed, for example, by giving the peripheral speeds of the roller R and the godet roller G2 a speed difference. And the tension is
It can be adjusted by giving an angle θ1 to the traveling yarn at least by the yarn guide A1.

FIG. 2 shows a continuous spinning method. Viscose rayon spun from a spinning nozzle is a godet roller G,
Nelson roller R2, Nelson roller R1, below R2-R1
-R2-R1 ... After being passed through R2-R1-, it is wound up. In this case, the drawing of the viscose rayon filament is performed between the godet roller G and the Nelson roller R2, and the tension specified in the present invention can be adjusted by the peripheral speed difference between the godet roller G and the Nelson roller R2. .

In the production method of the present invention, the conditions such as viscose composition, coagulation conditions, scouring, and drying conditions are the same as those used in conventional methods. In addition, it should be noted that the production method of the present invention is a continuous spinning method that has recently become more vigorous (that is, spinning is performed by discharging viscose from a spinning nozzle to solidify, regenerate, and immediately scouring and drying. Law), of course, and is not bound by any restrictions.

(Effects of the Invention) The viscose rayon filament yarn of the present invention has a fineness, and is equal to or better than the ordinary yarn and the multi yarn of the conventional yarn in each point of fluff and yarn quality,
It has not been known at all in the past, and is provided for the first time by the present invention. Further, such a yarn can be obtained by the production method of the present invention without any problems in the spinning method and operability.

(Examples) The examples described below are for convenience of description and do not limit the present invention. In the following example, only a very general representative example will be described.

Example 1 By the spinning method shown in FIG. 1, cellulose 8.2%, alkali 6.6%
Of viscose through a spinning nozzle with a nozzle hole diameter of 0.065 mm and 40 holes, H ₂ SO ₄ 135g / 1, ZnSO ₄ 15g / 1, Na ₂ SO ₄ 3
A yarn of 50 denier / 40 filament was spun at a spinning speed of 120 m / min while being spun in a coagulation bath at 00 g / 1 and a temperature of 47 ° C. and given 15% drawing. The stretching was performed by the difference in peripheral speed between the coaxial different diameter godet roller G1 and the rotating roller R. However, the peripheral speeds of the godet roller G2 and the rotating roller R were the same. To adjust the tension, a rotary roller guide is provided between the drawing and spinning nozzles and the godet roller G2 and between the godet roller G1 and the yarn winding pot, and the yarn bending angle (contact angle) at the guide is adjusted. ) Θ1 and θ2 are set to 160 ° and 170 °, respectively, so that local stress is not applied to the yarn.

The physical properties of the obtained viscose filament yarn are shown in Table 2 together with the tension.

Example 1-2 In Example 1, the yarn bending angles (contact angles) θ1 and θ2 at the guide were 170 ° and 180 °, respectively, and the tension was
A viscose rayon filament yarn was produced under the same conditions as in Example 1 except that the amount was adjusted to 0.10 g / denier. The number of fluffs of the obtained yarn is shown in Table 2.

Example 1-3 A fixed guide was used as the yarn guide, and the yarn bending angle (contact angle) θ1 and θ2 at the guide was 140 respectively.
A viscose rayon filament yarn was produced under the same conditions as in Example 1, except that the tension was adjusted to 0.38 g / denier and the temperature was adjusted to 170 °. The number of fluffs of the obtained yarn is shown in Table 2.

Comparative Example 1 A viscose rayon yarn was produced in the same manner as in Example 1 except that the bending of the running yarn by the yarn guide was substantially prevented (θ1 = θ2 = 180 °). Since the tension applied to the running yarn was too low at 0.03 g / denier, the running property of the yarn was poor, and there were many yarn breaks, and a yarn that could be used for the measurement of the number of fluffs was not obtained.

Comparative Example 2 A fixed guide was used as the yarn guide, and the yarn bending angles (contact angles) θ1 and θ2 at the guide were 120 respectively.
The viscose rayon filament yarn was manufactured under the same conditions as in Example 1-3, except that the tension was adjusted to 0.5 ° and 170 °, and the tension was adjusted to 0.55 g / denier. As shown in Table 2, the obtained yarn had a number of fluffs of 27/10 ⁶ m and was of poor quality.

Example 2 By the spinning method shown in FIG. 2, cellulose 8.0%, alkali 6.2%
Of viscose through a spinning nozzle with a hole diameter of 0.07mm and 100 holes, H ₂ SO ₄ 130g / 1, ZnSO ₄ 14g / 1, Na ₂ SO ₄ 2
Spinning in a coagulation bath of 70g / 1 at a temperature of 53 ℃, giving 13% drawing, spinning a yarn of 150 denier / 100 filament at a spinning speed of 110 m / min, and guiding it on a pair of Nelson rollers. Was treated with hot water at 85 ° C. throughout, and then continuous spinning was performed by winding the dried cheese. The stretching and tension adjustment were performed by providing a peripheral speed difference between the godet roller G and the Nelson roller R2.

Table 3 shows the tension and physical properties of the obtained viscose filament yarn.

Examples 2-2 and 2-3 In Example 2, by changing the diameter of the godet roller G, the godet roller G and the Nelson roller
A viscose rayon yarn was produced under the same conditions as in Example 2 except that the peripheral speed difference (= drawing ratio) of R2 was changed as shown in Table 3. The number of fluffs of the obtained yarn is shown in Table 3.

Comparative Examples 3 and 4 Example 2 was repeated except that the peripheral speed difference (= stretching ratio) between the godet roller G and the Nelson roller R2 was changed as shown in Table 3 by changing the diameter of the godet roller G.
Viscose rayon yarn was manufactured under the same conditions as above. As a result, when the tension was 0.03 g / denier (Comparative Example 3), there were many yarn breakages and the operability was extremely poor, so that a yarn that could be used for measuring the number of fluffs was not obtained. . In addition, when the tension is as high as 0.65 (Comparative Example 4), the operability is poor and the number of fluffs is 13 although it is not as great as in Comparative Example 3.
It was lower yarn practical and present / 10 ⁶ m.

[Brief description of drawings]

FIG. 1 shows the viscose rayon spinning method of the present invention (the spinning method adopted in Example 1), and FIG. 2 shows the viscose rayon continuous spinning method of the present invention (the spinning method adopted in Example 2).
FIG. 3 shows a conventional spinning method of viscose rayon. FIG. 4 is a perspective view of a rotary roller type yarn guide roller with low friction used to make the tension applied to a yarn negligible in a conventional viscose rayon spinning method. In the figure, N is a spinning nozzle, A1 and A2 are yarn guides,
G, G1 and G2 are godet rollers, R is a rotating roller, R
1, R2 are Nelson rollers, P is a yarn winding pot, and X is a tension measurement position.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-228013 (JP, A) JP-A-62-141112 (JP, A) JP-A-62-141113 (JP, A) JP-A-59- 47416 (JP, A)

Claims (2)

[Claims] 1. A viscose rayon spun from a spinning nozzle N is passed through a yarn guide A1 and is a coaxial different diameter godet roller G1, a small diameter roller G2 of G2, a rotating roller R, and a large diameter godet roller. When guiding the yarn in the order of G1, then passing through the yarn guide A2 and winding it into a pot, the traveling yarn reaching the rotating roller R and the godet roller G1 is applied by at least giving an angle to the traveling yarn by the yarn guide A1. The tension is 0.05 to 0.5 g / denier, and the single yarn fineness is 2 denier or less and the number of fluffs is 7
This / 10 ⁶ m manufacturing method of a small fineness viscose rayon filament yarn is less. 2. A viscose rayon spun from a spinning nozzle N, a godet roller G, a Nelson roller R2,
Guided in the order of Nelson roller R1 and then run between Nelson roller R2 and R1 and then wound up, due to the difference in peripheral speed between Godet roller G and Nelson roller R2, from Godet roller G to Godet roller R2 Manufacture of fine-fine viscose rayon filament yarn having a single yarn fineness of 2 denier or less and a number of fluffs of 7/10 ⁶ m or less, characterized in that the tension applied to the running yarn is 0.05 to 0.5 g / denier Method.