JPS62231009A - Melt spinning apparatus - Google Patents

Abstract

PURPOSE:To positively produce convection of a gas on the inside of an annular spun yarn and reduce the temperature difference between the inside and the outside, by providing a heat insulating material and hollow tubular body on the inside of nozzle rows annularly arranged on the undersurface of a nozzle plate. CONSTITUTION:A heat insulating material 9 is attached to the inside of annular rows on the undersurface of a nozzle plate 5 having annularly arranged many nozzles 6 and a hollow tubular body 11 is provided on the undersurface thereof with a given distance of interval (L). The above-mentioned hollow tubular body 11 may be simply a hollow pipe made of metal, ceramic or heat pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION 1.1-1 End-completed Ill generally relates to melt-spinning equipment for pitch-based carbon arts, etc., and in particular, means for adjusting the spinning atmosphere temperature on the spinning side of the melt-spinning nozzle plate. The present invention relates to a spinning device having a spinning device.

[Conventional method 1] For example, to melt-spun pitch-based carbon fiber, etc.
A melt spinning device is used in which a plurality of spinning nozzles are provided in a ring shape on a nozzle plate, extruding molten pitch through the spinning nozzles, and spinning pitch fibers.

In such a device, an accompanying flow is generated by the spun yarn on the spinning side of the nozzle plate.

The atmospheric temperature inside each thread that is spun into a ring becomes higher than the atmospheric temperature of the spinning device due to the influence of the accompanying flow. If there is a large temperature difference between the outside and the inside of the spun yarn, the orientation and diameter of the yarn cannot be controlled properly, making it impossible to achieve stable spinning and obtain high-quality fibers.
There was f.

For this reason, measures have been taken to lower the atmospheric temperature during melt spinning inside the spinning nozzle by spraying an inert gas or cooling gas into the lower center of the spinning nozzle, or by attaching a mesh pipe or the like.

1 to 11 In the case of melt spinning synthetic fibers, the spinning temperature is also 28.
It was effective because the temperature was around 0°C, the spinning diameter immediately below the spinning nozzle was large, the spinning speed was slow, and the number of yarns per strand was small.

However, when spinning pitch-based carbon fiber, the spinning temperature is as high as 300°C or higher, and the number of yarns per strand is 2.
In addition, the nozzle diameter of the spinning nozzle is as narrow as 0.2 to 0.3 mm, and the diameter of the yarn from each spinning nozzle is approximately 1107 tons at a position approximately 10 mm from the bottom of the nozzle plate. In spinning, where the so-called thinning phenomenon occurs, in which the yarn becomes thinner from front to back, the cooling of the outside of the nozzle due to the accompanying flow of the yarn is greater than in conventional synthetic fiber spinning.

Therefore, the difference in atmospheric temperature between the inside and outside of the spinning nozzle increases, and it is impossible to adjust it using the above-mentioned means, making it impossible to properly control yarn orientation and yarn diameter, resulting in stable spinning and high quality. Obtaining the fiber was essential.

1 to 1” The object of the present invention is to actively generate natural convection of gas inside the spinning nozzles arranged in an annular manner, and to reduce the temperature difference between the outside and inside of the yarn in the melt spinning atmosphere. Temperature in 7 columns mL
Another object of the present invention is to provide a melt-spinning apparatus for suitably controlling yarn orientation and yarn diameter, achieving stable spinning, and obtaining high-quality fibers.

o I Zhan -; The above purpose is melt spinning according to the present invention! Achieved in Ita. In summary, the present invention provides a nozzle plate in which a plurality of spinning nozzles are arranged in an annular manner, a heat insulating material located inside the annularly arranged spinning nozzles and attached to the lower surface of the nozzle plate, and a A hollow tubular body, preferably a hollow tubular heat pipe, is provided at a predetermined distance from the lower surface of the heat insulating material in order to adjust the atmospheric temperature inside the spinning nozzle of the melt-spinning material injected from the heat insulating material. This is a melt spinning device characterized by:

Hereinafter, the melt spinning apparatus according to the present invention will be explained in more detail with reference to the drawings.

Referring to FIG. 1, the melt spinning machine is equipped with a nozzle plate 5 attached to the bottom side of the spin block, and a plurality of spinning nozzles 6 are arranged in an annular manner on the nozzle plate 5. It is assumed that the rows are annular, but it may also be a plurality of concentric rows. Generally, the number of spinning nozzles 6 is selected so that the number of threads 7 to be spun is about 200 to 500, and the diameter of each spinning nozzle 6 is 0.2 to 0.3.
It is formed so that it becomes mm.

A heat insulating material 9 is provided on the lower surface of the nozzle plate 5 at a central portion 5a located inward from the annularly arranged spinning nozzles 6. On the lower surface of the heat insulating material 9, spacers 10 having a predetermined thickness 1, for example, about 7 mm, are arranged at equal intervals on the same circumference, and the hollow tubular body 11 is inserted through the spacers 10.
It is attached to the nozzle plate 5.

To explain further, in this embodiment, the hollow tubular body 11 is a hollow circular heat pipe 11, which can have various shapes, examples of which are shown in FIGS. 2 to 7. According to the embodiment shown in FIGS. 1 and 2, the heat pipe 11 has a hollow circular tube shape with an outer diameter portion 11a having a diameter of approximately 60 mm, an inner diameter portion 11b having a diameter of approximately 40 mm, and a length of approximately 150 mm. A heat absorption part 12 and a heat radiation part 13 are formed near the upper and lower ends of the outer diameter part 11a and the inner diameter part 11b, respectively.

According to experiments conducted by the present inventors, it has been found that the length of the heat pipe 11 is desirably about 2 to 6 times its outer diameter.

A mounting portion 14 for mounting the heat pipe 11 to the heat insulating material 9 is integrally formed at the upper end of the inner diameter portion 11b of the heat pipe 11. This mounting portion 14 is formed in a cross shape (
(FIG. 3), the heat pipe 11 is fixed to the nozzle plate 5 by drilling a hole 15 in its center, inserting a mounting screw 16 into the chain type 15, and screwing it onto the heat insulating material 9.

In this way, by attaching the hollow circular tube-shaped heat pipe 11 to the nozzle plate via the heat insulating material 9 and the spacer 10, the upper surface of the heat pipe 11 and the nozzle plate 5
A distance T of approximately 2 to 20 mm is formed between the lower surface of the holder and the lower surface of the holder.

According to the non-emission 11, the heat pipe 11 is connected to the heat absorption section 12. as described above. The heat radiation part 13 is the outer diameter part 11a of the heat pipe.
It is also formed in the inner diameter part 11b, and the heat exchange surface area is expanded.Furthermore, the high temperature gas above the outside of the heat pipe 11 flows downward, and the lower temperature gas flows through the heat pipe 11. According to the present invention, the natural convection of the gas is actively carried out, In this process, heat exchange is efficiently achieved in the heat pipe 11, and the atmospheric temperature inside each yarn spun into a ring is reliably lowered.

The shape of the heat pipe 11 is not limited to a hollow circular tube shape, but may be a truncated conical shape having a hollow portion as shown in FIGS. 4rA and 5, or a truncated conical shape as shown in FIGS. 6 and 5. The shape may be upside down as shown in Fig. 7, or may be a hollow rectangular tubular shape or a hollow rhombic tubular shape as shown in Fig. 9.
A hollow polygonal tubular shape (both not shown) is also a turning part. Furthermore, in order to enlarge the surface area of the heat absorption part 12 and the heat radiation part 13, it is also possible to provide fins on the outer diameter part 11a and the inner diameter part flb as shown in FIG.

According to the apparatus of the present invention having the above configuration, the high ambient temperature inside the yarn 7 that has been spun in an annular shape is reduced between the inside and outside of the yarn 7 due to the heat absorption and heat dissipation effect of the heat pipe 11 as described above. The difference in ambient temperature between the two temperatures has been reduced from the conventional approximately 2 to 5 degrees Celsius to approximately 1 degrees Celsius or less. In addition, the thread diameter of the thread is conventionally 1.
There was a variation of 0 gm ± 3 m, but 10 m ± 1
lum and variations are reduced. Furthermore, in terms of physical properties, the orientation of the pitch fiber is conventionally Ra5%, Ra-Rn4
0%, Rn50%, On5% was Ra-Rn
50%, Rn50%, and the elastic strength is 7t o
The variation in n was reduced to ±3 tons, and the quality of the fibers was stabilized.

In the above embodiment, a heat pipe was used as the hollow tubular body, but the present invention is not limited to this, and a hollow tube made of A material, Cu, SUS, ceramic, etc. with good thermal conductivity may be used. It is also possible (not shown) to use a hollow tube 11A made of the above-mentioned material with good thermal conductivity, as shown in FIG. 1O.
Install a small diameter heat pipe 11B inside the arm 14a.
It is also possible to fix the heat pipe IIB to the nozzle plate 5 via the heat insulating material 9.

1) The spinning apparatus according to the present invention configured as described above activates the convection action of the heated gas to reduce the difference in atmospheric temperature between the inside and outside of the spun yarn to within about 1°C. 7A, the yarn orientation and yarn diameter can be suitably controlled, stable spinning can be achieved, and high-quality fibers can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a spinning device according to the present invention. FIGS. 2 and 3 are a front view and a plan view of a heat pipe, which is an example of a hollow tubular body. ': rS Figures 4 and 5 are a front view and a plan view of other embodiments of the heat pipe. 6 and 7 are a front view and a plan view of still another embodiment of the heat pipe. FIGS. 8 and 9 are plan views of other modified examples of the heat pipe. FIG. 10 is a perspective view of another embodiment of the hollow tubular body. 5: Nozzle plate 6: Spinning nozzle 7: Yarn 9: Heat insulating material 10 Varnish spacer ll: Heat pipe Fig. 4 Fig. 6 1'1b

Claims (1)

[Scope of Claims] 1) A nozzle plate in which a plurality of spinning nozzles are arranged in an annular manner, and a heat insulating material provided and attached to the lower surface of the nozzle plate and located inside the annularly arranged spinning nozzles; A hollow tubular body is attached to the lower surface of the heat insulating material at a predetermined distance in order to adjust the atmospheric temperature inside the spinning nozzle of the melt-spun fibers injected from the spinning nozzle. Spinning equipment. 2) The device according to claim 1, wherein the hollow tubular body is a heat pipe. 3) The device according to claim 1, wherein the hollow tubular body is a hollow pipe made of metal or ceramics.