JPS61102407A - Device for melt spinning - Google Patents

Abstract

PURPOSE:To obtain the titled device with easy wiping operation, by setting a rectifying plate in such a way that it is adjustable from the same level as that of the end face of the protruded part of a spinneret or a position lower than it to a position higher than the end face of the protruded part, so that spun yarn will not cause fluctuation. CONSTITUTION:Similar holes are made on the rectifying plate 4 and the protruded part 3', a slit part is formed in a state where the rectifying plate 4 is positioned at the same level as that of the end face of a spinneret or a position lower than it, and an inert gas is made to flow out from the slit part. The distance D is preferably set at 0 during spinning. When D' is >0, denier unevenness is easily induced, but sealing properties with the inert gas is increased. During wiping operation, D is set at 2-5mm and operation is made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to melt spinning equipment. More specifically, the present invention relates to a melt spinning apparatus equipped with a device for supplying an inert gas to suppress staining of the spinneret surface due to low molecular weight substances generated during melt spinning.

Conventional technology Conventionally, there has been a melt spinning device that supplies inert gas near the spinneret (simply referred to as the spinneret).Among these, the sealing performance of the spinneret surface by the inert gas is particularly excellent, and it prevents contamination caused by low-molecular substances and materials. The method that maximizes the effect is to supply inert gas directly from the spinneret surface to the spinneret surface and around the spun yarn, and in this method, the area around the spinneret has the structure shown in Figure 4. There is.

This consists of a mouthpiece with a V-shaped cross section and a discharge hole at its apex, and a rectifying plate having holes similar to the mouthpiece discharge part, and is formed by the mouthpiece discharge part and the current plate. This is a device that supplies inert gas from the gap.

As a typical example, for example,
Publication No. 1987-109778, Japanese Patent Application Publication No. 1987-109778
There is a publication No.-6613.

However, conventional devices have the following problems.

(a) Since the discharge hole and the slit portion are close to each other, the slit portion is easily clogged with polymer during the wiping operation.

(b) If the discharge hole surface is not exposed below the end surface of the current plate, the wiping operation cannot be performed as it is.

p→ Even if the discharge hole surface is V-shaped or flat, the wiping operation with a jig is difficult because it is small.

b) The outflow direction of the inert gas contacts the spun yarn at an angle formed by the oblique side of the nozzle discharge portion and the vertical line, which tends to induce yarn shaking and cause denier unevenness.

In the conventional technology, there are such problems, and it is virtually impossible to perform a wiping operation after the spinneret surface is contaminated with low-molecular substances, and the influence of inert gas on the spun yarn C
denier spots) are likely to occur.

Problems to be Solved by the Invention The inventors of the present invention have arrived at the present invention as a result of intensive study of a melt spinning device that can significantly reduce production and labor costs in view of the problems of the existing technology. .

That is, the present invention provides a sealing effect of the mouthpiece surface using an inert gas that is not inferior to conventional methods, and significantly slows down the progress of contamination. In particular, it is an object of the present invention to provide a melt spinning apparatus which is characterized in that a wiping operation can be easily performed, and furthermore, the spun yarn does not exhibit yarn shaking.

Means for Solving the Problems The present invention comprises a spinneret having at least ] polymer discharge holes in a plurality of protrusions, and a rectifying plate fitted in the spinneret with a constant gap between the protrusions, In the melt spinning apparatus that supplies inert gas from the gap, the end face of the protruding part of the spinneret is flat, and the baffle plate is located at the same level as or below the end face of the protruding part, and during wiping, the end face of the protruding part is flat. The melt spinning apparatus is characterized in that the melt spinning apparatus is adjustable so as to be positioned higher.

The present invention will be explained below with reference to the drawings.

In Figure 1, 1 is a spinning head and 2 is a spin puncture.

The spin pack 2 is composed of a base (main body) 3, a base protrusion, a rectifying plate 4, a perforated plate, a door material, a wire mesh, etc. (not shown). The cap 3 has a plurality of protruding parts 3', and the end face of each of the protruding parts is a flat plane, preferably having an area of 20 mm or more, and has at least one polymer discharge hole 9 protruding therein. There is.

Similar holes are bored in each protruding portion of the current plate 4, and the slit portion 8 is formed in a state where the current plate 4 is located at the same level as or below the end face of the mouthpiece.

The gap between the slits 80 is preferably in the range of 0.5 to 1 inch, and the inert gas flows out from the slits 8 in parallel to the running direction of the spun yarn, and the inert gas flows out from the slits 8 to the lower surface of the protrusion 3' and the yarns in the vicinity. completely seal. A set screw 5 is used to fit the current plate 4 into the base 3. By adjusting the set screw, the fitting position of the current plate 4 can be set variably in the direction perpendicular to the end surface of the base. Reference numeral 6 denotes an inert gas conduit section, which is bored in the spin pack 2. The inert gas passes through the conduit portion 6 and is discharged from the opening 7 into the gap surrounded by the base 3 and the current plate 4.

The position of the opening 7 is not particularly limited, and it will not have any effect as long as it is within the above-mentioned cavity. For example, an inert gas conduit may be extended within the mouthpiece 3 and the gas may be discharged into the gap.

Figures 2 (a) and 2 (b) are cross-sectional views showing the positional relationship between the base 3 (substantially, the protruding portion 3') and the current plate 4;
stomach).

(b) D and D' respectively indicate the distance between the end surface of each base protrusion and the lower surface of the current plate 4.

Therefore, during spinning, it is most preferable to set D = Owtxt. If D > Omyx, the sealing performance by the inert gas deteriorates, which is not preferable.

Furthermore, when D'>Off, the direction in which the inert gas flows contacts the yarn side at a slight angle, which tends to induce denier unevenness, which is not preferable, but the sealing performance increases, so the continuous spinning time can be extended. There is an advantage. Next, when the protruding part 3' of the cap becomes dirty and a wiping operation is performed, by setting the setting between 022 and 5, only the lower surface of the protruding part 3' can be completely and easily operated.

Figure 3 (a) shows an end plan view of the protruding portion 3', and shows an example of the arrangement of the polymer discharge holes 9, showing a case where there are three polymer discharge holes and a case where there are six polymer discharge holes. Discharge hole 9
It is preferable to arrange them in a neat row or in a staggered pattern on the end surface of the protrusion 3', and to arrange them 1 to 5 mm inside of the end surface. If the polymer discharge hole 9 is located close to the end of the end surface of the mouthpiece protrusion 3' (less than 1 space), the wiping operation using the wiping jig becomes extremely difficult. If they are arranged in an array, the inert gas sealing performance will be incomplete, which is not preferable.

EXAMPLE Using the melt-spinning apparatus of the present invention, polyhexamethylene adipamide containing 0.3 M% titanium dioxide as a deglossing agent and having a relative viscosity of 4° was used to produce 7° d/24 f. The results of spinning are shown in Table 71.

Note that water vapor was used as the inert gas.

, Table 71 From this example, the time required for wiping due to dirt on the mouthpiece surface was extended by 10 to 14 times compared to 12 hours when an inert gas supply device was not used.

In addition, it has been shown that there is a tendency in the required period of wiping operation and denier unevenness depending on the position of the rectifying plate.
was the most stable condition.

Effects of the Invention The melt-spinning apparatus of the present invention has a rectifying plate that is vertical to the end face of the spinneret, and its position can be varied freely, and during spinning, the rectifier plate is set at the same level as the end face of the protruding part of the spinneret or below it. During operation, the end face of the rectifying plate is set in a position above the end face of the protruding portion of the base, thereby solving the conventional problems as described above. In addition, by making the end face of the protrusion flat, wiping operations using a jig are easy, and there is no need to replace the cap due to dirt on the cap surface.
The time required for the wiping operation has also been significantly shortened.Next, the flow direction of the inert gas supplied from the slit formed by the protrusion and the current plate is perpendicular to the spindle protrusion, Since it is parallel to the spun thread, there is little chance of yarn wobbling, and in terms of inert gas sealing, the polymer discharge hole is placed at the end of the end surface of the mouthpiece protrusion, so each discharge hole surface and discharge The vicinity of the yarn is in direct contact with the inert gas, so the sealing performance is perfect, and the continuous spinning time of the spinneret can be significantly extended without being inferior to conventional methods.

[Brief explanation of drawings]

Figure 1 is a sectional view of the spinneret of the melt spinning apparatus of the present invention, Figure 212 is a sectional view showing the positional relationship between the end face of the protrusion of the spinneret and the rectifying plate, and Figure 3 is an example of the arrangement of polymer discharge holes in the protrusion of the spinneret. The plan view and Figure 4 are cross-sectional views of a conventional spinneret. 1... Spinning head 2... Spinback 3... Cap (main body) 3'... Cap protrusion 4... Current plate 5.
...Set screw 6...Inert gas conduit section 7...
Opening part 8...Slit part 9...Polymer discharge hole 10...Filament Patent applicant Asahi Kasei Corporation Fig. 1 Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Claims] Consists of a spinneret having at least one polymer discharge hole in a plurality of protrusions, and a rectifying plate fitted into the spinneret with a certain gap between the protrusions and the inert gas supplied from the gap. In the melt spinning apparatus, the end face of the protruding part of the spinneret is flat, and the current plate is positioned at the same level as the end face of the protruding part or below it, and can be adjusted so that it is located above the end face of the protruding part during wiping. A melt spinning device characterized by providing