JPS6312177B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a fiber bundle tension cutting device. Conventionally, a method has been developed in which a tow or thread is cut and then joined together to produce a spun yarn all at once, but there is a problem in that the higher the cutting speed becomes, the more difficult the cutting becomes. That is, when the tension cutting speed increases, the fibers being stretched are disturbed by the turbulent gas. For this reason, attempts have been made to use a protective box to prevent airflow disturbance during tension cutting, and this has had some success, but even with this, if the count becomes thinner, high-speed tension cutting may be hindered. Ta. As a result of further investigation, we discovered that high-speed tension cutting can be achieved even with thin threads by using a protective box equipped with a rectifying plate of double or more structure with a flat surface in a direction substantially perpendicular to the tension cutting roller axis. This led to an invention. That is, the present invention provides a tow made of continuous fibers between a delivery roller and a pair of tension cutting rollers that rotate at a circumferential speed greater than the circumferential speed of the delivery roller.
Or, in a device for tension-cutting yarn, a protective box that is in close contact with the fiber bundle entry side of the tension-cutting roller and surrounding the fiber bundle, and in a direction perpendicular to the rotation axis of the tension-cutting roller. The fiber bundle tension cutting device is characterized in that it has a plurality of rectifier plates that are substantially parallel to each other, and the plurality of rectifier plates are arranged at opposing positions with the fiber bundle interposed therebetween. Hereinafter, the present invention will be explained in more detail with reference to the drawings. FIG. 1 is a process outline diagram showing a specific example using the device of the present invention, in which the tow or yarn 11 pulled out from the bobbin 1 is supplied to the first delivery rollers 3, 3' via the tension adjustment device 2. be done. The tow or thread 11 is then passed through a heating device 4, a second delivery roller 5, 5' and a pair of tension cutting rollers 7,
After the fiber bundle is drafted by a tension cutting device B consisting of a fiber bundle 7', it is subjected to an air false twisting treatment in a yarn forming section C and wound up. The first delivery rollers 3, 3' shown in FIG.
The second delivery rollers 5 and 5' are of a roller turn type using separate rollers, and the yarn forming section C consists of a suction device 8 for tow or yarn subjected to a tension draft, and a false twisting nozzle 9. When the main fiber bundle is untwisted, the fibers that are less susceptible to twisting among the fiber bundles subjected to the tension draft are wound around in the untwisting direction to form a spun yarn, which is then passed to the take-up roller 10,
10' and wound up. In this case, in the fiber bundle tension cutting device B, as shown in FIG. Turbulence is generated due to collisions between airflows. If the tow or yarn in the tension draft is disturbed by this turbulent airflow, yarn unevenness increases, yarn breakage, etc. occur, so the airflow disturbance effect has been prevented by using a protective box. As shown in FIGS. 3 and 4, the protective box according to the present invention is one that is in close contact with the fiber bundle entrance side of the tension cutting roller and surrounding the fiber bundle, and furthermore, This uses a plurality of rectifier plates that are approximately parallel to the direction perpendicular to the rotation axis direction. In other words, the protective box that has been tried in the past has a structure in which the fiber bundle entry side of the tension cutting rollers 7, 7' surrounds the tow or yarn, and is brought into close contact with the tension cutting rollers 7, 7'. , which protects the tow or yarn from the disturbing effects of turbulent air flow shown in Figure 2. The protective box of the device of the present invention has two rectifying plates or A plurality of such rectifier plates 6 are provided at opposing positions with the fiber bundle 12 in between. Further, the current plate 6 does not necessarily have to be a flat plate, and may be a curved plate, but it is necessary to use a plurality of plates and to make sure that they are substantially parallel. Since the device of the present invention has such a configuration, conventionally,
In the tried protective box, there is a slight gap in the contact area with the tension cutting rollers 7, 7' as shown in FIG. Can be done. In particular, when the count is thin, even slight turbulence can disturb the tow, causing single fibers to fly out from the gaps, causing increased yarn unevenness and yarn breakage. However, with the device of the present invention, This will eliminate the drawbacks. Since the protective box of the device of the present invention is provided with a plurality of rectifying plates as described above, it is assumed that air current due to the accompanying flow generated by the transfer of the fiber bundle is generated between the rectifying plate and the fiber bundle. It is thought that the flow velocity is different between the current plate and the current plate, and the gas that has passed between the current plates prevents the airflow from blowing out from the fiber bundle passing side, resulting in the above effect. ing. The present invention will be explained below with reference to Examples. Example 1 A polyester tow with a single yarn denier of 2.1 de was cut by the steps shown in FIG. 1 to obtain a No. 60 spun yarn. The yarn quality of this spun yarn is the Worcestershire unevenness U% and the number of nets (thickness per 1 mm length is +140% or more)
and compared with spun yarn obtained using a conventional protective box. The results are shown in Table 1. As is clear from Table 1, the number of neps is reduced by using the protective box according to the present invention. Furthermore, when conventional protective boxes are used, yarn breakage occurs frequently due to disordered tows, and stable continuous processing cannot be performed.

[Table] Example 2 Single yarn denier was obtained by the same process as in Example 1.
Obtained from 0.5 denier polyester tow
Table 2 shows the U% and Nep number of the No. 100 spun yarn. From Table 2 it is clear that U% is 20.1% to 18
%, indicating that the present invention is particularly effective in producing fine count spun yarn. As described above, according to the present invention, when a spun yarn is made at once by cutting tows or threads and tying them together, even if the count becomes thin, the disturbance of the airflow at the time of cutting can be prevented, resulting in uniform production. Since high-quality spun yarn can be obtained continuously and at high speed, the effect is very large.

【table】 [Brief explanation of the drawing]

Fig. 1 is a side view of a process showing a specific example using the apparatus of the present invention, Fig. 2 is a perspective view illustrating the occurrence of turbulence in the tension cutting roller, and Figs. 3 and 4 are views of the apparatus of the present invention. This shows an example of a protective box having a plurality of rectifying plates, and FIG. 3 shows a perspective view, and FIG. 4 shows a plan view thereof. Moreover, FIG. 5 is a perspective view illustrating the state of disturbance of single fibers between the protective box and the tension cutting roller. 5, 5'... Sending roller, 7, 7'... Tension cutting roller, 11... Tow or yarn consisting of continuous fibers,
6... Rectifier plate.

Claims (1)

[Claims] 1. In a device that tension-cuts a tow or yarn consisting of continuous fibers between a delivery roller and a pair of tension-cutting rollers that rotate at a circumferential speed greater than the circumferential speed of the delivery roller, the fiber bundle of the tension-cutting roller A protective box close to the entrance side and surrounding the fiber bundle, the protective box having a plurality of rectifying plates substantially parallel to a direction perpendicular to the rotation axis of the tension cutting roller, and rectifying the plurality of sheets. A fiber bundle tension cutting device characterized in that plates are arranged at positions facing each other with the fiber bundle sandwiched therebetween.