JP3350218B2 - Melt spinning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for melt-spinning thermoplastic synthetic fibers such as polyamide and polyester, and more particularly to a heating means provided below a plurality of spinnerets arranged in parallel in a row. .

[0002]

2. Description of the Related Art In the production of thermoplastic synthetic fibers, generally, a molten polymer is discharged from a spun chimney and melt-spun to form the polymer into a fiber shape. In such a melt spinning, in order to increase the production efficiency, a plurality of spinneret packs are arranged in parallel in a row on a spin block as proposed in, for example, JP-A-62-33815. A plurality of multifilaments spun from a plurality of spinneret packs are used in the same spinning cylinder.

[0003] However, in such a spinning method, the yarn spun from both ends of the spinneret arranged in parallel in a row is strongly affected by the heating means provided at the end. On the other hand, spinnerets other than both ends are
It is not so strongly affected by the heating means installed at the end. Therefore, there is a problem that a weight difference occurs between the spun multifilaments.

In order to solve this problem, for example, Japanese Patent Application Laid-Open No. 3-104910 proposes providing a heat insulating material on the surface of a heating wall which is a support frame of a heater as a heating means. In Japanese Patent Application Laid-Open No. 3-249205, an attempt has been made to eliminate the difference between the weights at both ends and other portions by changing the watt densities of the heaters at both ends and the other heaters. I have.

[0005] With the recent increase in spinning speed,
The effect of air accompanying the spun yarn becomes remarkable, and such an accompanying air flow becomes a turbulent flow, which is a major cause of denier spots on the yarn.

Accordingly, it is necessary to review the management of the spinning atmosphere below the plurality of spinnerets arranged in parallel in a row not only from the ambient temperature but also from the viewpoint of controlling the associated flow.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a yarn spun from a plurality of spinnerets arranged in parallel in a row, which has been introduced for improving productivity in recent years as described above, can be produced at high speed. An object of the present invention is to provide a melt spinning apparatus in which a difference between weights does not occur in melt spinning.

[0008] Therefore, an object of the present invention is to provide a simple melt spinning apparatus capable of making the ambient temperature below the spinneret uniform and at the same time rectifying and controlling the accompanying flow so as not to become turbulent. As a result, the present invention is intended to eliminate dendritic spots such as denier spots, mechanical spots, and spot spots.

[0009]

According to the present invention, there is provided a melt spinning apparatus satisfying the following requirements A to D at the same time. A. A plurality of spinnerets arranged in parallel in a row; B. a heating means surrounding the yarn spun immediately below the spinneret and installed along the yarn running direction; A plurality of straightening plates projecting from the inner wall surface of the heating means along the running direction of the yarn; A blocking means provided immediately below the current plate to prevent intrusion of cooling air from below.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a front sectional view showing one embodiment of the present invention. FIG. 2 is a view taken along the line AA in FIG.

In FIG. 1, 1 is a spin block, 2 is a plurality of spin packs mounted in parallel with the spin block (1), 3 is a spinneret, and 4 is a spinneret (3). This is a base heater for carrying out. Below the spinneret (3), a heater (5) as a heating means and a heat retaining block (6) are installed along the running direction of the yarn so as to surround the spun yarn (Y). To form a delayed cooling chamber (H) for the spun yarn. Further, a plurality of straightening plates (7) projecting toward the running direction of the yarn are provided on the running surface of the heater (5) along the running direction of the yarn. E denotes an exhaust hole for discharging the pyrolysis gas of the polymer staying below the spinneret (3).

Here, the heater (5) as the heating means may be a sheath heater cast from various types of good heat conductive metals, a heater in which a linear sheath heater is wound around the outer surface of a heating wall, or a plate heater. Can be used. In addition, as shown in FIG. 2, the current plate (7) is preferably detachable with a fastening bolt (11) or the like so as to be able to flexibly respond to changes in spinning conditions.
In this way, when spinning polymers having different melting points or spinning yarns having different numbers of filaments or deniers, the optimum spinning is performed by changing the surface area, shape, material, etc. of the current plate (7). It becomes possible to respond quickly to conditions.
Such a flow straightening plate (7) prevents the accompanying flow generated along with the running of the spun yarn (Y) from becoming a turbulent flow in the delayed cooling chamber (H) and contributing to the above-described inter-weight spots. I do. In addition, the radiating area of the rectifying plate (7) and the number of installed rectifier plates (7) are adjusted so that the ambient temperature at both ends of the plurality of spinnerets (3) arranged in parallel to the central portion does not cause temperature unevenness. Can be set freely.

Next, the spun yarn (Y) that has exited from the delay cooling chamber (H) is introduced into the cooling chamber (C). The cooling chamber (C) is realized by a spinning cylinder (8). The spinning cylinder (8) is spun through a cooling air introducing means (10) for blowing out cooling air uniformly. (Y) is sprayed. As a result, the spun yarn is sufficiently solidified and wound up by a winding machine (not shown) via an oil applying device (not shown), a take-up roller (not shown), and the like. In addition,
As the above-mentioned spinning cylinder, in addition to the horizontal blowing spinning cylinder of the embodiment, for example, a vertical blowing spinning cylinder or the like is used according to the purpose. As described above, the spun yarn (Y) is cooled and solidified by the cooling air in the spinning cylinder (8), but the cooling air enters the delay cooling chamber (H) and disturbs the ambient temperature. In order to prevent this, it is necessary to provide a shutter (9) as a blocking means. The shutter (9) has a yarn that the spun yarn (Y) fluctuates under the influence of the cooling air and does not contact the shutter (9), or does not adversely affect the yarn even if it comes into contact with the shutter (9). A strip passage (9a) is provided. At this time, considering the workability at the start of spinning and at the time of yarn breakage,
It is preferable that the shutter (9) is divided into two parts at the center part and has a structure that can be pulled out right and left.

In the above embodiment, the case where four spinnerets are arranged in parallel in a row has been described. However, the present invention is not limited to this, and three or five or more spinnerets can be applied. It goes without saying that you can do it.

[0015]

As described above, according to the present invention, the following effects can be obtained.

That is, the ambient temperature surrounding the spun yarn below the spinneret can be kept uniform regardless of the position of the spun yarn. In addition, since the current plate is detachable, even if the spinning conditions change, the current plate can be quickly replaced with a current plate suitable for the conditions. In particular, it is possible to suppress the turbulence of the accompanying flow generated with the recent increase in spinning speed, and it is possible to stably obtain a product of uniform quality.

Further, the efficiency of heat transfer to the yarn is improved, and the yarn can be easily attached to and detached from the existing heating means, so that the above effect can be obtained at a small cost. There is also.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spin block 2 Spin pack 3 Spinneret 5 Heater 6 Insulation block 7 Straightening plate 8 Spinning cylinder 9 Shutter C Cooling room E Exhaust hole H Delayed cooling room Y Spun yarn

Claims (1)

(57) [Claims] 1. A melt spinning apparatus which satisfies the following requirements A to D at the same time. A. Have a parallel arrangement in a row , and both ends of the arrangement
A plurality of spinnerets provided at a central portion therebetween ; B. a heating means surrounding the yarn spun immediately below the spinneret and installed along the yarn running direction; Run along the running direction of the yarn on the inner wall surface of the heating means.
It protrudes toward the yarn and also serves as a radiator plate from the heating means.
D. a plurality of flow straightening plates for straightening the yarn accompanying flow; A blocking means provided immediately below the current plate to prevent intrusion of cooling air from below.