JPH0336941B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method for imparting strong twist to polyester yarn by so-called water twisting. (Conventional techniques and problems) Strong twisting of polyester yarn has been carried out in various ways in the past. For example, a dry method using an Italian twisting machine is common, but some methods use a Hatcho twisting machine. This was done by adjusting the tension of the threads pulled out from the tube as uniformly as possible using weights. However, this method does not yield high-quality thread,
There were many problems such as twist unevenness and tension unevenness. The reason why it is difficult to obtain high quality yarn is as follows. In general, polyester threads have properties such as smoothness, hardness, repulsion, and easy stretching. For this reason, when the yarn is pulled out from the tube on the twisting machine, it is difficult to pull it out uniformly, and sometimes the winding shape on the tube is disturbed by the centrifugal force caused by the rotation of the tube, and a large amount of yarn is pulled out at the same time. This is because the thread that is pulled out may pull out other threads that are wound around the tube and disturb the tension adjustment. These phenomena immediately appear as twist unevenness, tension unevenness, etc. The present invention has been made to solve the above-mentioned problems, and provides a method that allows the threads wound around a tube to be pulled out as uniformly as possible without causing any disturbance when strongly twisting polyester. The purpose is to (Means for Solving the Problems) The present invention, which has been made to achieve the above-mentioned objects, is characterized by using water on the polyester threads to which a sizing agent is attached when twisting the polyester threads strongly. The twist is 1000 to 4000 times/min. (Example) Hereinafter, the present invention will be described in detail based on one preferred embodiment thereof. The polyester yarn according to the present invention is preferably a normal filament yarn, but may be a spun yarn without any particular limitation. Such polyester threads cannot be used in the present invention unless they are coated with a sizing agent. As the glue, there are no particular restrictions and any commonly used glue can be used.
For example, gelatin, PVC and other synthetic or natural thickening agents may be mentioned. The amount of glue applied can be adjusted appropriately depending on the type and properties of the thread.
There is no particular limit, but it is usually 2 to 8%, preferably 5%.
An example is about 7%. Although any suitable gluing method may be used, it is more desirable to use a method in which the gluing agent penetrates into the filament. FIG. 1 shows an example of a sizing method, in which, for example, a yarn 1 in the form of a pirn 2 is sized using a roller 3, and a bath 4 contains a sizing agent solution. The polyester thread 10 to which the sizing agent is attached is wound up, for example, into a skein 11, and then, for example, the second
As shown in the figure, it is re-wound onto a flanged (H-shaped) bobbin 5. The glued polyester yarn 10 re-wound onto the flanged bobbin 5 in this way is then wound into a lower tube and wound onto a twisting tube 6, for example, the wood tube 6 shown in FIG. 2. At this time, water 7 is used. When the thread is rolled up, the glue that has penetrated into the thread migrates to the surface due to the tension during winding and the centrifugal force caused by the rotation of the woodwind, improving the glue's adhesion. That is, as shown in FIG. 3 1, the sizing agent 9 contained in each filament 8 is transferred to the surface of the yarn as shown in FIG. The adhesive adheres well. At this time, there are no particular restrictions on the shape of the tube, but
Preferably, the traverse width should be 4 to 7 cm, and the thread winding end should be a little shorter than 3 cm, preferably 4 cm.
It is preferable to leave the above edges and wrap them up. The state in which the thread is wound up in this way is shown in Fig. 4.The traverse width refers to the width L that the thread traverses when the tube rotates once, and the tail end of the thread is the direction in which the thread is pulled out during twisting. This refers to the part N where the thread is not wound around the tube body. Of course, such L and N may be set as appropriate, but when the above values are set, the winding shape becomes good and there is an advantage that the yarn is less likely to be disturbed on the tube during twisting. In this way, for example, a polyester thread wound around a woodwind is further immersed in a water bath in that state and then dried at a low temperature, whereby the sizing agent is further transferred to the surface of the thread and a desirable effect is exerted. At this time, the temperature of the water bath,
There are no particular restrictions on the time, but examples include usually a temperature of about 5 to 40°C, preferably about 10 to 30°C, and about 0.5 to 3 hours, preferably about 1 to 2 hours. At this time, it is free to add an appropriate sizing agent to the water bath as needed, and in order to replenish the sizing agent that falls off during the water bath, an appropriate amount, preferably, for example, at a bath ratio of about 1 to 3, is added to the yarn amount. It is preferable to add 2 to 4% of the total amount. Thereafter, low-temperature drying is performed, and the drying method is not particularly limited, and examples include natural drying and drying in a drying room. If drying is carried out in a drying room, it is desirable to dry at a low temperature for a long time, e.g. below 50°C, preferably from 10 to
It may be carried out at 40°C for 6 hours or more, preferably 8 to 10 hours, but there are no particular limitations on these values. High-temperature drying may impart setting properties to the yarn, so it is difficult to say that it is preferable, and low-temperature drying in this example refers to, for example, natural drying or indoor drying at a temperature of 50° C. or lower. By performing such drying, the sizing agent that has migrated to the surface of the thread re-fixes on the surface, making it possible to better control the loosening of threads such as woodwind, which tends to occur when the spindle rotates during twisting. After going through the above steps, the sized polyester yarn 10 wound up into a tube is then subjected to strong twisting using a wet twisting machine. A wet twisting machine is also called a water twisting machine.
In short, twisting is performed while using water, such as by sprinkling water or making water droplets drop. The outline is as shown in Fig. 5, and 11 shows a water droplet,
12 is a spindle, and the tube body 6 is inserted into this spindle 12. Reference numeral 13 denotes a shizu ring (weight), and the movement of this shizu ring generally adjusts the tension of the thread to facilitate stable supply of the thread. At this time, in this example, it is desirable that the distance between the tip M, that is, the tip of the woodwind 6 and the tip of the spindle 12, be 3 cm or more, preferably 4 cm or more. This allows for a more stable supply of yarn, but
Of course, this value is not particularly limited and may be any value. In this way, strong twisting is performed using water, and the number of twists at this time is about 1000 to 4000 times/min, preferably about 1000 to 3000 times/min. When the polyester yarn with the sizing agent attached to it as shown in this example is subjected to strong twisting using a wet twisting machine, as shown in the previous example, the sizing agent of the sized polyester yarn is transferred to the surface of the yarn as much as possible through a process. This makes it difficult for the yarn to loosen when it is pulled out from the tube, and it becomes possible to supply the yarn with approximately uniform tension. Furthermore, since strong twisting is performed using water, the thread contains water and adheres closely to the unwound end of the thread of the tube body, that is, the winding end N and the tip M of the thread, resulting in a more uniform thread. This makes it possible to improve the conventional non-uniform twisting and create products without twist unevenness, tension unevenness, etc. From this point of view, as mentioned above, it is also understandable that it is preferable to make the winding end N and the tip M of the thread long, for example. The above is just a description of one preferred embodiment of the present invention, and it goes without saying that the present invention is not limited to the above embodiment. For example, each process such as winding the lower tube, dipping in a water bath, and drying at low temperature may be performed as necessary. Further, the shape of the tube, the distance between the tabs, etc. may be set as appropriate. Furthermore, as mentioned above, the expression "using water" may be used by dropping water droplets, immersing in water, spraying water, or pouring water, and is not particularly limited. There are no particular restrictions on the wet twisting machine, and any suitable method may be used, and it goes without saying that the tension may be adjusted by other methods without using the shiz wheel, and the tension may be adjusted if necessary. Examples of the polyester according to the present invention include polyethylene terephthalate, polybutylene terephthalate, polyethylene isophthalate and copolymers thereof, cationic dyeable polyester, etc., and there are no particular limitations as long as they are collectively referred to as so-called polyesters. Next, specific examples of the present invention will be described. Example 1 Two 75 denier polyester filament yarns made of polyethylene terephthalate were prepared, and 6% polyvinyl alcohol sizing agent was added to the weight of the yarn.
It was adhered using the roller gluing device shown in FIG. 1 so as to have the following properties, rolled up into a skein shape, and then re-wound onto a flanged bobbin. After that, the lower tube was rolled up while water was poured over it, and the tube was rolled up onto the woodwind (pipe body). Such a tube body is compatible with the spindle of a wet-type yarn twisting machine, and the amount of water is such that the yarn is evenly wetted, and the size agent is not transferred to the surface of the yarn due to tension or centrifugal force when winding up the tube body. . At this time, the winding shape of the tube body was such that the traverse width L was 5 cm, and the winding tail end was approximately 4 cm. Next, 3% of the sizing agent attached in the previous step based on the amount of yarn was added to a water bath at 30°C containing the same sizing agent (bath ratio 1:
3) for 1 hour, and then low-temperature drying for 8 hours in a drying room at 40°C. By going through this process, the threads on the surface of the tube stopped loosening. After such a preparation process, a well-known wet yarn twisting machine is used to remove water droplets and wet the yarn.
A strong twist was applied at a rate of twists/min. At this time, the tip of the tsum was 4 cm, which was longer than what is normally used. At that time, when the thread was pulled out, the thread was wound three times at the winding end of the tube body and three times at the tip of the thread, and was pulled out smoothly. When strong twisting is applied in this way, the thread contains water,
In addition, the wet thread tended to adhere to the end of the thread winding end of the tube body and the tip of the spool, so that the shiz ring hardly moved. This also indicates that the yarn was supplied with approximately uniform tension. The highly twisted polyester yarn had a small number of yarn breaks, and was also good in that it had very few occurrences of twist unevenness, tension unevenness, poor shape, etc. Next, water use down pipe winding (water use, no water use),
Water bath treatment (with or without sizing agent), drying process (low temperature,
Examples 2 to 9 were conducted by changing the winding shape (high temperature), winding shape, water usage twisting, twisting method, etc., or excluding those with these steps. These results are shown in Table 1. <Comparative Example> Comparative Examples 1 to 4 were similarly tested, and the results are also shown in Table 1.

【table】

[Table] (Note) *1...None means only winding of the lower pipe *2...None means no water is used. Results of 2 or less on a scale of 5 to 1 are considered unfavorable.
In addition, in order to create a fabric using the polyester strongly twisted yarn created in the example, the strongly twisted yarn may be used in either the warp or the weft, or it may be made of the same material or a different material that is not strongly twisted. There are no particular restrictions, and the threads may be mixed as appropriate. To make crepe, the threads made in this example may be used for the warp and weft, and in this case, Z twist, S twist, etc. may be mixed as appropriate, as in the case of making silk crepe. (Effects of the Invention) As can be seen from the results listed in Table 1, the highly twisted yarn according to the present invention requires fewer cuts during production, has less twist unevenness and tension unevenness, and has a good shape. From this, it is known that the present invention has exceptional effects. Further, by using the polyester yarn according to the present invention, it is also possible to produce a crepe fabric with a uniform grain height similar to a fabric made using highly twisted silk yarn.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of the sizing process according to the present invention, Fig. 2 is an explanatory diagram showing an example of the lower tube winding process, and Fig. 3 is an explanatory diagram showing an example of the sizing process according to the present invention. FIG. 4 is a side view showing an example of the rolled-up shape when rolled up into a tube, and FIG. 5 is an explanation showing an example of a wet twisting machine. It is a diagram. 1... Polyester yarn, 6... Tube body, 9...
Gluing agent, 10...polyester thread with glue attached,
11...Water, 12...Spindle, 13...Shiz wheel, 20...Wet twisting machine.

Claims (1)

[Claims] 1. A method for strongly twisting polyester yarn, which is characterized by twisting polyester yarn coated with a sizing agent at a rate of 1,000 to 4,000 times/min while using water.