JPH02448B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to improvements in spinnerets.

For example, a conventional hollow fiber spinneret has a spinning hole 3 consisting of a polymer introduction hole 1 and a C-shaped interrupted annular polymer discharge hole 2, as shown in FIG.
The melted polymer discharged from the polymer discharge hole 2 of the hollow fiber spinneret 4 has a C-shaped cross section at both ends welded immediately after spinning, forming a circular hollow as shown in Fig. 2. This is thread 5.

By the way, in the above hollow fiber spinneret 4, the upper surface of the core bar 6 and its connection part 7 inside the polymer discharge hole 2 are flat, and the width of the connection part 7 is thin and weak. Normal hollow fibers 5 can be obtained, but when used for a long period of time, due to the high heat of the melted polymer and high spinning pressure, the core bar 6 becomes abnormally hollow with a difference in the circumferential direction, that is, misalignment, as shown in FIG. A yarn 5' is obtained. As the core bar 6 continues to sag, it falls off as shown by the chain line in FIG. 3, resulting in an abnormal solid yarn 5'' as shown in FIG. 4b.

The present invention has been made in order to solve the disadvantages of spinnerets having an annular irregularly shaped discharge hole with a part of the discharge hole interrupted, such as the conventional hollow fiber spinneret. But never deformed,
The object is to provide a spinneret that will not fall off.

Hereinafter, an embodiment of the spinneret according to the present invention will be described with reference to the drawings. As shown in FIG. In the hollow fiber spinneret 4', which has a large number of equally spaced spinnerets, from the lower inner circumferential surface of the polymer introduction hole 1 to the upper surface of the core 6 inside the polymer discharge hole 2 via the connection part 7 of the core 6. It is formed by integrally forming a support portion 8 in the shape of a gentle arc.

Although the upper surface shape of the arc-shaped support portion 8 is square, it is preferable to make it into a chevron shape or an arc shape in order to reduce the resistance of the dissolved polymer during spinning.

The hollow fiber spinneret 4' of the present invention configured as described above has a core bar 6 inside the polymer discharge hole 2 and an upper surface of the connecting portion 7 of the core bar 6 connected to the lower inner circumferential surface of the polymer introduction hole 1. Since the arc-shaped support part 8 is integrally provided and the core bar 6 is firmly held on the inner surface of the spinning hole 3, the core bar 6 will not hold at all even when subjected to the high heat of the melted polymer and high spinning pressure during spinning. It does not deform, and the core bar 6 does not sag or fall off even after long-term use. Therefore, the melted polymer discharged from the polymer discharge hole 2 has both edges of a C-shaped cross section welded immediately after spinning, so that the inner and outer circumferences are the same as shown in Fig. 2, and the thickness is uniform in the circumferential direction. hollow fiber 5
is obtained.

The above embodiment is a hollow fiber spinneret 4' for melt spinning.
However, as shown in FIG. 6, there is also the case of a hollow fiber spinneret 4'' for wet spinning.

Further, in the present invention, the same effect can be obtained not only for hollow fibers but also for hollow fibers as long as the discharge hole has an annular irregular shape with a part of the discharge hole cut off as shown in FIGS. 7 and 8.

As can be seen from the above explanation, the spinneret of the present invention is
Even after long-term use, the core bar inside the polymer discharge hole never deforms or falls off, so it is possible to always obtain normal hollow fibers or irregularly shaped fibers, making it an ideal alternative to conventional spinnerets. It can be said to be a revolutionary thing.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view showing the main parts of a conventional hollow fiber spinneret, Fig. 2 is a cross-sectional view of a normal hollow fiber, and Fig. 3 is a polymer discharge hole in a conventional hollow fiber spinneret. FIG. 4a is a longitudinal cross-sectional view of the main part showing a state in which the inner core bar is deformed and hanging down; FIG. 4a is a cross-sectional view of the abnormal hollow fiber spun from the polymer discharge hole shown in FIG. Figure b is a cross-sectional view of an abnormal solid fiber discharged and spun from the polymer discharge hole where the core metal has fallen off, as shown by the chain line in Figure 3, and Figure 5 is a cross-sectional view showing the main parts of the hollow fiber spinneret of the present invention. FIG. 6 is a longitudinal cross-sectional view showing the main parts of the hollow fiber spinneret according to the present invention for wet spinning, and FIGS. 7 and 8 show other examples of the polymer discharge hole according to the present invention. It is. DESCRIPTION OF SYMBOLS 1...Polymer introduction hole, 2...Polymer discharge hole, 3...Spinning hole, 4', 4''...Hollow fiber spinneret of the present invention, 6...Core bar, 7...Connection part, 8... Support part.

Claims (1)

[Claims] 1. In a spinneret having a spinning hole consisting of a polymer introduction hole and a partially interrupted annular polymer discharge hole following the spinneret, from the lower inner peripheral surface of the polymer introduction hole to the upper surface of the core bar inside the polymer discharge hole. A spinneret characterized by having a supporting portion integrally formed with the support portion.