JPS6346166B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical field] The present invention provides a spinning and taking-off method for obtaining a good package form by keeping the tension of the running yarn (spinning tension) low and stable when taking off melt-spun thermoplastic synthetic fiber yarn. It is related to. [Prior art and its problems] When melt-spinning thermoplastic synthetic fibers, cooling,
Due to the refueling process, temperature and humidity adjustment of the winding section, and work requirements such as modification of the mouthpiece surface, the floor where the mouthpiece is installed and the floor where the take-up machine is installed are on different floors. It is common that
In this case, the height from the cap surface to the take-off machine will be at least 4 m or more. In addition, the speed at which these synthetic fiber yarns are drawn is generally at least 1000 m/min or more, and in recent years, undrawn yarns drawn at 2500 m/min or more have become very common for direct drawn false twisting applications. It is becoming a common thing. In this way, when a multifilament is run for a distance of 4 m or more without substantially converging, it encounters resistance from the air, and the yarn tension increases linearly as it goes downstream, causing the undrawn yarn to When picked up, the bulge and ears will be large. This tendency becomes more pronounced as the distance traveled without convergence increases or as the take-up speed increases, and in extreme cases, problems such as deformation and netting may occur. As a means to avoid this increase in spinning tension due to air resistance, for example, as shown in Japanese Patent Publication No. 57-55805, there is a method of converging the spun yarn using a means such as a guide near the solidification point of the spun yarn. is proposed. Although it is expected that the spinning tension will be reduced to some extent by using such a method, the yarns downstream of the focusing means are not sufficiently focused, and the spinning tension and tension fluctuations during running are large, especially in the godetless method. When it is removed, the package swells, the edges are large, and there are many single threads that fall off and fluff, which leads to problems such as thread breakage in the subsequent process. Another method is to provide a lubricating function to a focusing guide installed near the solidification point to more actively collect the yarns, but generally speaking, the lubricant is applied evenly to each of the 20 or more single yarns. Therefore, even with such a method, it is difficult to completely focus the yarns downstream of the focusing guide. In addition, as a means for converging yarns, for example,
As shown in Japanese Patent No. 58-17289, there is a method of converging the yarns upstream by using a fluid treatment device, but in this method, if the yarn is to be used for a long time, the fluid ejection hole with an oil agent is used. This is not preferable because it causes clogging, etc., and reduces focusing performance. On the other hand, in the case of winding via a take-up roller (godet roller), although fluctuations in spinning tension are absorbed to some extent, the difference in spinning tension appears as a difference in winding tension, and the same problems as in the godetless method described above cannot be solved. do not have. [Object of the Invention] The object of the present invention is to provide a spinning take-off method that eliminates the above-mentioned drawbacks and can maintain a good package form over a long period of time by lowering the spinning tension and reducing fluctuations. It's about doing. [Structure of the Invention] That is, the present invention, when taking off a melt-spun thermoplastic synthetic fiber yarn, sets the shape of the yarn guide in the take-off section and the yarn path near the yarn guide to a range that satisfies the following formula. This method is characterized in that a focusing guide is provided upstream of the yarn path guide. R≦5 (mm) 20゜≦α≦70゜ 2゜≦β≦10゜ [However, R: Radius of curvature of the weaping running part of the yarn guide α: Entering the cross section of the yarn guide and the yarn guide Angle β with the yarn: represents the bending angle of the yarn in the yarn guide] The present invention will be described in detail below. Generally, when taking thermoplastic synthetic fiber yarns to form an undrawn yarn package, if the bundle is not sufficient, each single yarn will experience resistance from the air, so the single yarns will converge and become a bundle. The increase in tension between spinning and winding is greater than in the case of spinning. The inventors of the present invention have conducted extensive studies on the problem that when the multifilament is not sufficiently focused, the tension increases due to resistance with the air. By regulating the thread path within a certain range,
The yarn upstream of the yarn guide is twisted at a rate of 3 to 30 t/m, and due to the convergence effect of the twist, the air resistance that the yarn receives during spinning is small, which means that the spinning tension is low and stable, making it suitable for long periods of time. It has been discovered that a package form with a unique shape can be obtained. In applying this method, it is necessary to install a focusing guide upstream of the yarn guide to stop the twisting going back. By installing the yarn guide and the focusing guide in this way, the twist is applied between these two guides and the yarn is bundled. Therefore, in order to lower the spinning tension, the yarn guide should be installed as much as possible on the winder or godet roller. It is preferable to provide the focusing guide as close to the solidification point of the yarn as possible. On the other hand, if the yarn running on the yarn guide and the convergence guide is not lubricated, the friction on the yarn guide will cause single yarn breakage and decrease in strength and elongation. In order to obtain this, it is necessary to apply a lubricant on or upstream of the focusing guide. In the latter case, it goes without saying that the oil applying device must be placed downstream of the solidification point of the yarn. Next, the present invention will be explained in more detail using the drawings. FIG. 1 is a schematic diagram showing an example of a spinning take-off device used in the present invention. Fig. 2 is a plan view showing an example of the thread guide used in the present invention, Fig. 3 is a schematic diagram for explaining the attachment of the thread guide in the present invention, and Fig. 4 is a diagram illustrating the thread guide in the present invention. FIG. In FIG. 1, the synthetic fiber yarn 8 spun from the spinneret 3 is cooled by rectified cooling air, passes through the oiling device 4 installed slightly downstream from the point where orientation and solidification are completed, and at this point An oil agent is applied to the yarn. Thereafter, the yarn passes through the convergence guide 2, passes through the yarn guide duct 5, is guided to a take-up floor, passes through the yarn guide 1, the traversing fulcrum guide 6, and is taken into the package cage 7. Here, the shape of the yarn guide 1 provided in the take-up section and the shape of the yarn near the yarn guide 1 play an important role in twisting and converging the yarn between the yarn guide 1 and the collecting guide 2. It is a road. That is, for example, a thread guide 1 having a shape as shown in FIG. 2 is used, the radius of curvature R of the thread running section is set to 5 mm or less, and then the thread guide 1 is set as shown in FIG. 3. The angle α between the entering yarn 8 and the cross section of the yarn guide 1 is set to 20° to 70°, and the bending angle β of the yarn in the yarn guide 1 is set to 2° as shown in FIG. ~
Adjust to 10°. Thread guide 1 only when the shape, installation angle, and thread guide satisfy all of the above relationships.
Twisting occurs further upstream, and the yarn is converged as if it were a single yarn bundle between the yarn path guide 1 and the convergence guide 2, and increases in spinning tension and fluctuations in spinning tension due to air resistance can be suppressed to a very small level. This makes it possible to obtain good yarn quality and package form with small selvage and bulges, no fluff or single yarn shedding, etc. Next, the constituent elements of the present invention will be explained in more detail. The radius of curvature R of the thread running section of the thread guide 1 is desirably 5 mm or less, preferably between 0.5 mm and 5 mm.If the radius of curvature R exceeds 5 mm, even if the installation angle α of the thread guide 1 is Even if the bending angle β is within the range specified by the present invention, twisting cannot be imparted and the object of the present invention cannot be achieved. Moreover, a thread guide having a radius of curvature R of 0.5 mm or less is generally a very small size guide, which is undesirable because it interferes with thread threading operations. As shown in FIG. 2, the shape of the yarn guide 1 can achieve the object of the present invention if the radius of curvature R of the section where the yarn runs is 5 mm or less; From the viewpoint of usability of the surface, it is preferable that the cross-sectional shape is circular. The angle α between the cross section of the yarn guide 1 and the yarn 8 entering the yarn guide 1 needs to be in the range of 20° to 70°, preferably in the range of 30° to 60°. is desirable. If the angle α is less than 20° or more than 70°, twist cannot be imparted even if R and β are within the range specified by the present invention, and the object of the present invention cannot be achieved. Although FIG. 3 shows an example in which the yarn path guide 1 is tilted upward to the left, even if it is tilted upward to the right, the purpose can be achieved as long as α is within the above range. Finally, the bending angle β of the yarn 8 at the yarn guide 1 is
It is necessary that the angle be within the range of 2° to 10°. In other words, if β exceeds 10°, even if the spinning tension is lowered due to the focusing effect of twisting, the squeezing at the yarn guide 1 will be too strong and the tension during winding will increase, causing single yarn breakage. As a result, the package form becomes defective, and the purpose of the present invention cannot be achieved. Therefore, it is desirable to set the bending angle β of the yarn path to the minimum angle that allows the twist to be applied more preferably upstream of the yarn path guide 1 than the yarn surface. On the other hand, the minimum angle β that can be twisted is related to the spinning tension per denier in the yarn guide 1, and the higher the spinning tension per denier, the smaller the minimum bending angle β required for twisting. In the spinning tension range of 0.05 g/d to 0.5 g/d, β
If the angle is less than 2°, twist cannot be imparted and the object of the present invention cannot be achieved. Although FIG. 4 shows the angle β when the yarn 8 is pulled forward from the yarn guide 1, the object of the present invention can also be achieved by pushing the yarn 8 toward the back from the yarn guide. can be reached. The shape of the focusing guide 2 used in the present invention is not particularly limited as long as it has a function of preventing the twist from going back upstream of the focusing guide 2. Regarding the lubricant application device 4, although an example of an lubricant supply guide type is shown in FIG. 1, other forms, such as an oiling roller type, are also suitable for the purpose of the present invention. Among these, it is very preferable to use an oil supply guide that also has the function of a focusing guide from the standpoint of equipment and adjustment. Furthermore, although FIG. 1 shows an example of a godetless method, even when a godet roller is used, the thread guide 1 is provided in front of the first godet roller to regulate R, α, and β within the range specified by the present invention. By doing so, it is possible to similarly keep the spinning tension low and stable, resulting in a good package form. [Effects of the Invention] As mentioned above, the thread converging means of the present invention is extremely simple and has very remarkable effects, but the most excellent point of this means is that it can be used continuously for a long period of time. Even when spinning, R, α, β are initially
As long as the guides are set and each guide is installed, there is no change in the spinning tension over time, that is, a change in the convergence state, and a good package form can be maintained stably. Therefore, it can be said that it is an extremely effective and practical means for process control. The present invention will be explained in more detail with reference to Examples below. Example: Put melted polyethylene terephthalate into base 3.
After spinning, cooling and solidifying, an oil supplying guide is used as the oil application device 4 to emulsion the oil.
After adhering 0.6%, the yarn is guided to the take-up floor through the convergence guide 2, and the undrawn yarn of 180 denier-36 filament is transferred to the package cage 7 at a take-up speed of 2000 m/min through the yarn guide 1 and the traversing fulcrum guide 6. I took over. Here, we used a thread guide 1 with a circular cross section, changed R, α, and β as shown in Table 1, and measured the spinning tension and tension fluctuation.
A kg package was obtained and the package form was determined. The focusing guide 2 was installed at a position of 1.8 m from the spinneret 3, and the yarn guide 1 was installed at a position of 4.5 m from the spinneret 3, and the spinning tension was measured under the yarn guide 1.

【table】

[Table] Levels Nos. 1 to 7 show examples of the present invention, and Nos. 8 to 13 show comparative examples for the present invention. As shown in Table 1, when the shape of the yarn guide 1 and the yarn path in the yarn guide 1 are within the range specified by the present invention, the spinning tension is low and the package form is good.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of a spinning take-off device used in the present invention. Fig. 2 is a plan view showing an example of the thread guide used in the present invention, Fig. 3 is a schematic diagram for explaining the attachment of the thread guide in the present invention, and Fig. 4 is a diagram illustrating the thread guide in the present invention. FIG. 1: yarn path guide, 2: focusing guide, 3: spinneret, 4: oil application device, 5: yarn path duct, 6: traverse fulcrum guide, 7: package, 8: yarn.

Claims (1)

[Scope of Claims] 1. When taking off the melt-spun thermoplastic synthetic fiber yarn, the shape of the yarn guide in the take-off section and the yarn path near the guide are set within a range that satisfies the following formula,
A spinning take-off method characterized in that a focusing guide is provided upstream of the yarn path guide. R≦5 (mm) 20゜≦α≦70゜2゜≦β≦10゜ [However, R: Radius of curvature of the weaping running part of the yarn guide α: Entering the cross section of the yarn guide and the yarn guide Angle β with the yarn: represents the bending angle of the yarn at the yarn path guide] 2. Claim 1, characterized in that an oil agent is applied to the yarn on the converging guide or upstream of the guide. The described spinning take-off method.