JP2555604B2 - Direct drawing and winding method of synthetic fiber yarn - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a direct drawing-type winding method in which a synthetic fiber yarn is melt-spun, drawn, and wound at a high speed.

(Prior Art) A synthetic fiber yarn made of polyester, polyamide, or the like is melt-spun and sequentially wound around a plurality of godet rollers such as a first godet roller, a second godet roller, and a third godet roller, and drawn between these godet rollers. After that, draw threads on the bobbin driven by the take-up roller.
A method of winding at a high speed of 00 to 6000 m / min is known. Conventionally, in order to facilitate drawing, the temperatures of the second godet roller and the third godet roller are set to relatively high temperatures, and the number of windings of the yarn around these godet rollers is relatively increased. For example, in the direct drawing of a polyamide yarn, the temperature of the second godet roller and the third godet roller is usually set to 160 ° C. and the number of windings of the yarn is set to 4 times.

(Problems to be Solved by the Invention) Conventionally, the temperatures of the second godet roller and the third godet roller are set relatively high, the number of windings of the yarn is large, and the yarn is in contact with the hot godet roller for a long time. Since the shrinkage due to the cooling shrinkage of the yarn and the residual strain after drawing occurs, the higher the winding speed exceeds 4000 m / min, the faster the package is formed by winding the yarn on the bobbin. However, there was a problem that the end face of swelled and the bulge became large, and the package shape became defective.

The present invention provides a method for directly drawing and winding a synthetic fiber yarn, in which a package having a small bulge and a good shape can be obtained and the spinning speed can be further increased.

(Means for Solving Problems) The melt-spun synthetic fiber yarn Fa is wound around a plurality of godet rollers 2, 3, 4 in order and drawn, and wound at a winding speed of 1000 to 6000 m / min. In the method for directly drawing and winding synthetic fiber yarns, the ratio of the winding speed to the peripheral speed of the final godet roller 4 located immediately before the winding roller 6 is 0.9.
The winding tension of the yarn Fa becomes maximum when the temperature of the final god roller is changed under the condition of setting the size to any value between 1.1 and 1.1, and this maximum winding tension is 0.38 g / d.
As described above, the temperature of the immediately preceding second godet roller 3 located immediately before the final godet roller, the number of windings of the yarn Fa with respect to the final godet roller 4 and the immediately preceding second godet roller 3 are selected, and the final godet roller 4 is also selected. Set the temperature within ± 2.5 ° C of the temperature at which the winding tension of the above yarn becomes the maximum, and then take up the winding tension.
The yarn is wound by setting the winding speed and the peripheral speed of the final godet roller 4 so as to be 0.19 g / d or more and 1/2 or less of the maximum winding tension.

(Operation) The winding speed and the peripheral speed of the final god roller 4 are fixed so that the ratio of the winding speed (frequency of the winding roller 6) and the peripheral speed of the final god roller 4 becomes an arbitrary value of 0.9 to 1.1. When winding is carried out under the conditions and the temperature of the final godet roller 4 is raised from room temperature, the winding tension reaches a maximum at a certain temperature, and when it exceeds this temperature, the winding tension is lowered (see FIG. 2), and a mountain-shaped curve a is formed. , B, c, d, e, f, g, h,
i, j are obtained. However, depending on the number of windings of each yarn Fa with respect to the final got roller 4 and the immediately preceding second godet roller 3, the level of the above-mentioned chevron curve and the position of its peak vary depending on the temperature of the immediately preceding second got roller 3, but as described above. And obtain the temperature at which the winding tension becomes maximum, and the yarn Fa for each of the final godet roller 4 and the immediately preceding second godet roller 3 is adjusted so that the maximum winding tension (g / d) at this time becomes 0.38 g / d or more. Of the number of windings and the temperature of the immediately preceding second godet roller 3 and the final godet roller 4
± 2.5 ℃ of the temperature at which the above maximum winding tension is obtained
The optimum temperature of the final got roller 4 is determined by setting the range to.

In this case, the ratio of the winding speed to the peripheral speed of the final godet roller 4 (winding speed ratio) is preferably 0.95. When the winding speed ratio is less than 0.9, the winding degree becomes impossible due to the looseness of the yarn. On the contrary, if it exceeds 1.1, the yarn breakage increases. If the temperature of the final godet roller 4 is set below the lower limit value of the peak range of the mountain curve or conversely above the upper limit value, the desired maximum tension cannot be obtained.

After setting the temperature of the final godet roller 4 as described above, the take-up speed and the final godet roller are adjusted so that the take-up tension falls between 0.18 g / d and 1/2 of the maximum take-up tension indicated by the chevron curve. By adjusting the peripheral speed of 4,
A speed is set to reduce yarn slack, yarn breakage, bulge, etc. to a negligible level. At the time of the above adjustment, it is preferable to fix the peripheral speed of the final godet roller 4 to reduce the winding speed, which facilitates the above adjustment. However, when the winding tension is less than 0.19 g / d, the winding tension is too low and the final god roller 4 and the winding roller 6
The yarn Fa between the end god roller 4 and the final godet roller 4 becomes liable to be wound around the final godet roller 4 and the yarn breakage occurs.
The yarn separation from the yarn becomes worse and the yarn breakage increases. On the contrary, 1 /
When it exceeds 2, since the winding tension is too large, the yarn Fa contracts after being wound on the bobbin 7, and the contraction pressure causes the end face Fb (see FIG. 3) of the package F to swell and the bulge P to be bulged. Grows larger.

(Embodiment) In FIG. 1, 1 is an oil supply device provided below a spinning nozzle (not shown), 2 is a first godet roller, 3 is a second godet roller (the second godet roller immediately before), and 4 is a third godet roller. (Final Godetroller)
Separator rollers 2a, 3a and 4a are attached to these godet rollers 2, 3 and 4, respectively, and the melt spun synthetic fiber Fa is oiled by the oil supply device 1 and then the first godet roller 2a. 2 and its separator roller 2a, the second roller 3 and its separate roller 3
a, and the third god roller 4 and its separate roller 4a are wound one to several times in sequence and fed, stretched in the meantime, and then wound on a bobbin 7 driven by a winding roller 6. To form the package F.

A 70 denier 48 filament nylon multi-filament yarn (synthetic fiber yarn) Fa was melt-spun, stretched and wound using the above apparatus. That is, the ratio (winding speed ratio) of the winding speed (peripheral speed of the winding roller 6) and the peripheral speed of the third godet roller (final gotting roller) 4 to 0.929,
In addition, the number of windings of the yarn Fa around the second godet roller 3 is set to 2
The temperature of the second godet roller 3 and the number of windings of the yarn Fa against the third godet roller 4 are set as parameters, and the temperature of the third godet roller 4 is gradually increased under the conditions of Examples 1 to 10. The winding tension (g / d) was measured. The setting conditions of the above experiments 1 to 10 are shown in the table, and the relationship between the temperature of the third godet roller 4 and the winding tension (g / d) obtained for these examples is shown in FIG.

The chevron curves a to j in the graph of FIG. 2 correspond to Experimental Examples 1 to 10, and the maximum winding tension is 0.38 g /
d or more experimental examples f, g, h, i, j are selected as Examples 1, 2, 3, 4, 5 of the present invention, and the others are Comparative Examples 1, 2,
Selected as 3, 4, and 5. Then, these Examples 1-5
For Comparative Examples 1 to 5, the temperature of the third godet roller (final gotting roller) 4 was set to the peak value of the chevron curve, and then the winding speed ratio was set to wind the yarn. The winding conditions at this time and the quality of the obtained packages are also shown in the table.

(Effect of the Invention) According to the present invention, a package having a small bulge and a good shape can be obtained, and it is not necessary to reduce the winding speed of the yarn to 1000 m / min or less.

[Brief description of drawings]

FIG. 1 is a schematic view of a device for directly drawing and winding a synthetic fiber yarn, and FIG.
The figure is a graph showing the relationship between the temperature of the third godet roller (final godet roller) and the winding tension, and FIG. 3 is a front view of the package. Fa: synthetic fiber yarn, F: package, 2: first godet roller, 3: second godet roller (immediately second godet roller), 4: third godet roller (final godet roller),
6: Take-up roller, 7: Bobbin.

Claims (1)

(57) [Claims] 1. Direct drawing and winding of synthetic fiber yarn, wherein the melt-spun synthetic fiber yarn is wound around a plurality of godet rollers in order and drawn at a winding speed of 1000 to 6000 m / min. In the method, the temperature of the final godet roller was changed under the condition that the ratio of the take-up speed to the peripheral speed of the final godet roller located immediately before the take-up roller was set to an arbitrary value between 0.9 and 1.1. At that time, the temperature of the second godet roller immediately before the last godet roller, the temperature of the last godet roller and the immediately preceding godet roller are set so that the winding tension of the yarn becomes maximum and the maximum winding tension becomes 0.38 g / d or more. 2 Select the number of windings of the above-mentioned yarn with respect to the godet roller, and set the temperature of the above-mentioned final godet roller within the range of ± 2.5 ° C of the temperature at which the winding tension of the above-mentioned yarn is maximum, and then take up the winding tension. Is 0.19 g / d or more and 1/2 or less of the above maximum winding tension, and the winding speed and the peripheral speed of the final godet roller are set to wind the above-mentioned yarn, and the synthetic fiber yarn is wound. Direct drawing and winding method for strips.