JP2000345424A - Melt spinneret pack and melt-spinning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spinneret pack having a structure suitable for the spinneret pack having a penetrating hole in its center, and to provide a melt-spinning device having a spinning tube with a compact structure. SOLUTION: This melt spinning device is provided by assembling a center spacer 203 formed with a penetrating hole and having a cross section of a reversed T shape with a spinneret 202 as one unit, also forming a polymer flow passage having a cross section with an almost Z shape between a polymer filter (sand 210) and a spinning nozzle 202a. Further, the spinning tube 300 consists of an air-penetrating inner tube 301, an outer tube 302 surrounded by putting plural inner tubes together and a cooling air-supplying duct 303 connected to the outer tube 302.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a melt spinneret pack and a melt spinning apparatus, and more particularly, to a melt spinneret pack having a through hole for exhaust in the center and a melt spinning apparatus having an improved spinning cylinder. .

[0002]

2. Description of the Related Art Generally, when melt-spinning thermoplastic synthetic fibers such as polyester or polyamide, a molten polymer metering device, a spin block as a box enclosing a heating medium, and mounting holes formed in the spin block. Melt spinneret pack (hereinafter referred to as the cap pack) which is stored and heated in the filter contained in the cap pack,
2. Description of the Related Art A melt spinning apparatus having a pack component such as a bridge plate or a spinneret, and a spinning cylinder for cooling a number of yarns (single yarns are referred to as filaments) spun from the spinneret is widely used.

[0003] In such a melt spinning apparatus, conventionally, the quality and uniformity of spun yarn have been improved, and the number of yarn breaks has been reduced.
In order to improve the yield and increase the productivity (high speed, multi-spindle), various improvements have been proposed regarding the heating method of the die pack, its shape or filter, and the internal structure of the die pack regarding the polymer flow. In addition, improvement of a cooling system using a spinning cylinder has been proposed. Among such proposals, as a technique for improving the die pack, a through-hole for exhausting cooling air, which is proposed in JP-A-52-31109, is provided at the center of the die pack to improve the cooling effect. There is something to enhance.

[0004]

SUMMARY OF THE INVENTION The present invention provides a spinneret pack having a structure suitable for a spinneret pack having a through hole in the center as described above and a melt spinning apparatus having a compact spinning cylinder. It is.

[0005]

According to the present invention, there is provided a base pack comprising:
It has a spinneret pack body, a top insert having a polymer introduction hole, a polymer filter housed in the spinneret pack body, a bridge plate, and a spinneret having a large number of spinning nozzles formed in an annular shape. In a die pack having a through hole for use, a center spacer having a through hole and having an inverted T-shaped cross section is integrally incorporated with the spinneret, and a polymer having a substantially Z-shaped cross section is provided between the polymer filter and the spinning nozzle. A flow path is formed.

[0006] Thus, a through hole for exhaust is formed in the center of the pack, and the generation of foreign matter is suppressed by eliminating the stagnation portion of the polymer. In addition, uniform heating is performed to produce uniform quality yarn. Cooling properties can be improved.

[0007] Further, a polymer passage having a substantially Z-shaped cross section is formed by a bridge plate receiver incorporated between a center spacer and an inverted conical bridge plate. Become. Other features will be described below.

In the melt spinning apparatus of the present invention, a heating spin block in which mounting holes for a plurality of die packs and a polymer passage reaching each of the die packs are formed, a die pack, and a spun yarn are formed. In a melt spinning device including a spinning cylinder to be cooled, the spinning cylinder includes a gas-permeable inner cylinder surrounding a yarn spun from each die pack, and an outer cylinder such as a group surrounding a plurality of the inner cylinders. It is characterized by comprising a cooling air supply duct connected to the outer cylinder.

Thus, the spun yarn can be cooled compactly, efficiently and uniformly, and the yarn of uniform quality can be stably spun. Also, productivity can be improved by dividing the spun yarn and winding it up as a plurality of individual yarns.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. 1 is a side sectional view of one embodiment of a melt spinning apparatus according to the present invention, FIG. 2 is a simplified sectional view taken along the line XX of FIG. 1, and FIG. 3 is a partially enlarged view of a die pack part of FIG. FIG. 4 is a simplified bottom view of the spinneret, FIG. 5 (a) is a partial top view of the bridge plate, and FIG.
5B is a partial bottom view of the same, and FIG. 5C is a view taken along the line YY of FIG. 5A.

In FIG. 1, 100 is a spin block, and 200 is a spin block.
Is a cap pack. Spinner pack 200 is a spin block 1
It is housed in the pack mounting hole 101 formed in 00 and fixed to the spin block 100. Reference numeral 300 denotes a spinning cylinder fixed by appropriate means (not shown) and located below the spin block 100.

Reference numeral 102 denotes a gear pump for measuring and feeding the molten polymer fixed in the spin block 100; 103, a mounting bolt for fixing the base pack 200 to the spin block 100;
Is connected to an exhaust through hole (described later) of the die pack 200,
An exhaust hole 105 formed in the spin block adjusts an opening degree of the exhaust hole 104 by a throttle valve provided at an outlet of the exhaust hole 104. Reference numeral 106 denotes a guide hole of the molten polymer from the gear pump 102 to the base pack 200, and reference numeral 107 denotes a heat medium enclosing space formed inside the spin block 100, and an appropriate heat medium sealed therein is supplied with a heater (not shown). ) And spin block 100
At a predetermined high temperature. Further, the spin block 100 is covered with a suitable heat insulating material (not shown).

As shown in FIG. 3, a mouthpiece pack 200 is inserted into the cylindrical pack body 201 and the pack body 201.
A spinneret 202, a center spacer 203 having an inverted T-shaped cross section having a through hole 203a formed in the center, a bridge plate receiver 204,
Bridge plate 205, lower perforated plate 206, inner ring spacer
207, outer ring spacer 208, upper perforated plate 209, sand 210 for filtration filled between upper and lower perforated plates 209, 206, top insert 211 and lock ring 212, spinneret 202
Holding plate 213, which also has a through hole 213a at the center,
It comprises a plurality of fixing bolts 214 for fixing the presser plate 213, the spinneret 202, and the center spacer 203 so as to sew them. Here, the upper and lower perforated plates 209 and 206 may be wire mesh. The upper and lower perforated plates 209 and 206 and the filtering sand 210 filled therebetween constitute a polymer filtering filter.

The top insert 211 has a vertical through hole 211a connected to the through hole 203a, and an oblique hole connected to the through hole 211a and obliquely connected to the exhaust hole 104 of the spin block 100.
211b is formed. The through hole 213a of the holding plate 213, the through hole 203a of the center spacer 203, and the through hole 211a form a straight hole among the exhaust holes. Also, the top insert 21
In the center of the upper surface of 1, a polymer introduction hole 211c is vertically drilled, and three polymer conduction holes 211d are formed radially and equally from the lower end of the introduction hole 211c, avoiding the through hole 211a and the oblique hole 211b. And the inner space 211 of the top insert 211
The top of e is open.

As shown in FIG. 4, a large number of spinning nozzles 202a for spinning each single yarn (filament) f (FIG. 3) are formed in the spinneret 202 in a concentric annular shape.
Is divided into four groups A, B, C, and D, and the gap d between the spinning nozzles between the groups is 2 to 4 of the nozzle perforation pitch p.
It is twice as large. Also, a number of radial grooves 205a (upper surface) and 206a (lower surface) are formed on the upper and lower surfaces of the flat inverted conical bridge plate 205 as shown in FIGS. 5 (a), 5 (b) and 5 (c). And form a polymer flow path as described below.

When assembling the base pack 200,
First, the spinneret 202 and the center spacer 203 are firmly fixed with fixing bolts 214 via an annular gasket 215, and are mounted in the pack body 201. Next, the bridge plate receiver 204 was mounted on the spinneret 202 via the ring gasket 216, and the bridge plate 205 and the lower perforated plate were sequentially mounted.
206, the inner ring spacer 207, the outer ring spacer 208, the sand 210, and the upper perforated plate 209 are assembled as a stack, and the top insert is inserted between the inner surface of the center portion of the top insert 211 and the upper end of the center spacer 203 via the inner seal ring 217. Place 211.

Finally, a lock ring 212 formed with a male screw to be screwed with a female screw formed on the upper inner surface of the pack main body 201 is tightened via an outer seal ring 218 on the peripheral edge of the upper surface of the top insert 211, and the pack main body is tightened. Fix each part in 201. At this time, the high-pressure molten polymer is
1 and the top insert 211, an inner seal ring 217, an outer seal ring 218, and an annular gasket 21 between the center spacer 203 and the spinneret 202.
5. Sealed by the ring gasket 216 between the bridge plate receiver 204 and the spinneret, and does not leak out of the spinneret pack 200.

The base pack 200 assembled in such a manner as to seal the polymer is mounted in the mounting hole 101 of the spin block 100 and fixed by a plurality of mounting bolts 103. At this time, an inlet gasket 219 is inserted between the polymer introduction hole 211c of the base pack 200 and the polymer introduction hole 106 of the spin block to seal the introduced polymer.

Here, the molten polymer pumped from the gear pump 102 is supplied to the polymer introduction hole 106 and the polymer introduction hole 211.
c, through each polymer conduction hole 211d, the inner space 211e, is sent into the die pack 200, each perforated plate 209, 206 and the sand 210
The grooves 205a, 2 on the upper and lower surfaces of the bridge plate 205
After passing through the passage formed by the lower surface of the bridge plate receiver 204 and the upper surface of the bottom of the center spacer 203 through 05b, it reaches the spinning nozzle 202a of the spinneret 202 and is spun as a filament f. As shown in FIG. 3, a rotationally symmetric polymer passage having a substantially Z-shaped cross section is formed between the upper and lower surfaces of the bridge plate 205, the bridge plate receiver 204, and the center spacer 203, and the polymer is once guided to the outer periphery of the pack. After that, it returns to the inner peripheral portion and is again guided to the spinning nozzle on the outer peripheral portion.

Next, returning to FIGS. 1 and 2, the spinning cylinder 300 will be described. The spinning cylinder 300 includes a plurality of air-permeable inner cylinders 301 formed immediately below the plurality of spinneret packs 200 attached to the spin block 100 to form a ventilation portion, and an outer cylinder 302 surrounding the plurality of inner cylinders 301. A cooling air supply duct 303 for supplying cooling air to the cylinder 302 is provided.

The inner cylinder 301 is composed of a ventilation cylinder 301a having a ventilation portion made of an upper porous plate and a protection cylinder 301b fitted to the lower part of the ventilation cylinder 301a. The mounting position of the protection cylinder 301b is changed, and screws 301c are used. By fixing, the total length of the inner cylinder 301 can be adjusted. The outer cylinder 302 is a cooling air supply cylinder 302a surrounding the ventilation cylinder 301a.
And a protective outer cylinder 302b provided below and connected thereto. The cooling air of the spun yarn is sent from the supply duct 303 to the supply tube 302a of the outer tube 302, and is blown out from the ventilation tube 301a of the inner tube 301, and passes through the filament f, and also bundles these filaments f. The spun yarn F is cooled.

Next, spinning in the above melt spinning apparatus will be described. The melted polymer is supplied at a predetermined pressure while being metered by the gear pump 102 as described above, and a polymer passage 106 serving as a polymer passage and a polymer introduction hole 211 are provided.
c to a spinneret pack 200, foreign matter is removed by a filter such as a sand 210, and the mixture is transferred while being kneaded in a polymer flow path formed in the pack, and a number of filaments are fed from an annular spinning nozzle 202a of a spinneret 202. spun as f.

A large number of the spun filaments f are cooled by the cooling air blown out of the ventilation tube 301a, solidified, bundled and taken up as a yarn F, and subjected to the next processing or taken up as it is. To be wound into a package. In the illustrated example, all the filaments f spun from the spinneret 202 were bundled and processed as one yarn F. As described with reference to FIG. It can be divided into two and processed as two or four individual threads, respectively, to increase the productivity.

Here, in the mouthpiece pack 200 of the present invention, a polymer flow path having a substantially Z-shaped cross section is formed inside the pack, and the polymer is once guided to the outer periphery of the pack and then converged on the inner periphery. Spinning nozzle formed annularly on the outer periphery
Since it is made to discharge and spin from 202a, it is heated by the spin block 100 and moves the polymer between the outer periphery of the high-temperature pack and the inner periphery of the relatively low-temperature pack to equalize the polymer temperature and at the same time The polymer once kneaded to the outer periphery is converged on the inner periphery to knead and homogenize the polymer and spin. This improves the quality of spun yarn and reduces process abnormalities such as thread breakage. I can do it.

Also, the die pack of the present invention has a through hole for exhaust at the center. During cooling of the spun filament, the heated cooling air near the surface of the spinneret is quickly discharged from the through hole 213a to the exhaust hole 104, so that cooling is efficiently performed and at the same time generated near the surface of the spinneret. In addition, the decomposition gas, foreign matter, and the like from the molten polymer can be eliminated, and the spinnability can be further favorably maintained. As described above, the spinning cooling air in the vicinity of the die is discharged from the exhaust hole 104, and the rest moves downward in the spinning cylinder along with the traveling spun filament or yarn and diffuses into the spinning cylinder. . The amount of cooling air discharged upward is
By adjusting the degree of opening of the throttle valve 105, an appropriate cooling air flow and discharge ratio can be set, and good spinning and cooling conditions can be maintained.

In the spinning cylinder 300 of the present invention, a plurality of inner cylinders are provided in correspondence with the plurality of spinnerets attached to the spin block, and an outer cylinder surrounding the plurality of inner cylinders is provided. Since cooling air is supplied from the outer cylinder to the ventilation cylinder of each inner cylinder, the cooling conditions for each spun yarn are uniform, and at the same time, the structure of the spinning cylinder becomes simple and compact.

In the above embodiment of the base pack,
The center spacer 203, the bridge plate receiver 204, and the bridge plate 205 formed a polymer channel having a substantially Z-shaped cross section. This facilitates assembly and manufacture. However, in some cases, the bridge plate and the bridge plate receiver may be integrally formed to perforate the polymer flow path therein. Although a narrow groove serving as a polymer channel is formed in the bridge plate, a groove may be formed on the upper surface of the bridge plate receiver 204 in place of the groove 205a on the lower surface, or a slit may be formed instead of the groove. A channel may be used, and other appropriate means can be adopted for forming the Z-shaped polymer channel. The filter (sand, perforated plate, etc.) portion or gasket portion of the base pack 200 may employ any known mechanism.

Further, the through hole for exhausting the base pack 200 is inclined obliquely at the upper part, while the polymer introduction hole 211c reaching the base pack 200 is provided at the center, and the center through hole is avoided therefrom to be radially symmetric. Since a plurality of conductive holes 211d are opened at the top of the inside of the top insert 211, the introduced polymer does not stay in the pack and can maintain smooth fluidity. Can be avoided. However, such considerations may not always be necessary for a polymer having good fluidity.

Further, the holding plate 213 is made of a heat insulating material. By using the heat insulating material in this way, it is possible to prevent the spinneret 202 (spinning nozzle portion 202a) from being abnormally low in temperature due to relatively low-temperature cooling air, but it is not necessarily required depending on the amount of cooling air flowing through the exhaust hole 104. There is no need to consider insulation.

[0030]

According to the spinneret pack of the present invention, a spinneret pack body, a top insert having a polymer introduction hole, a polymer filter housed in the spinneret pack body, a bridge plate, and a number of spinning nozzles are annularly formed. In a spinneret pack having a spinneret and having a through hole for discharging cooling air at the center thereof, a center spacer having a through hole and an inverted T-shaped cross section is integrally incorporated with the spinneret, and a polymer is formed. Since a polymer channel having a substantially Z-shaped cross section is formed between the filter and the spinning nozzle, the polymer is moved between the outer peripheral portion of the high-temperature pack and the inner peripheral portion of the relatively low-temperature pack so as to equalize the polymer temperature. The polymer once kneaded to the outer periphery is converged on the inner periphery to knead and homogenize the polymer and spin. It can be reduced step abnormalities such as monitor filament breakage.

Further, according to the melt spinning apparatus of the present invention, a heating spin block in which mounting holes for a plurality of die packs and a polymer passage reaching each die pack are formed, a die pack, and a spun yarn In a melt spinning device consisting of a spinning cylinder that cools the yarn, the spinning cylinder has a gas-permeable inner cylinder surrounding the yarn spun from each die pack, and an outer cylinder that surrounds a plurality of inner cylinders collectively. Since the cooling air supply duct is connected to the outer cylinder, the cooling conditions for the spun yarn are uniform, and at the same time, the structure of the spinning cylinder is simple and compact.

[Brief description of the drawings]

FIG. 1 is a side sectional view of one embodiment of a melt spinning apparatus according to the present invention.

FIG. 2 is a simplified sectional view taken along line XX of FIG. 1;

FIG. 3 is a partially enlarged view of a die pack unit of FIG. 1;

FIG. 4 is a simplified bottom view of the spinneret.

5 (a) is a partial top view of a bridge plate, FIG. 5 (b) is a partial bottom view of the same, and FIG. 5 (c) is a YY line of FIG. 5 (a).
It is an arrow view.

[Explanation of symbols]

 100 Spin block 104 Exhaust hole 106 Polymer hole 200 Cap pack 201 Cap pack main body 202 Spinneret 203 Center spacer 204 Bridge plate receiver 205 Bridge plate 210 Sand (filter) 211 Top insert 203a, 213a, 211a Through hole (direct hole) 211b Slanted hole 211c Polymer introduction hole 211d Polymer conduction hole 213 Presser plate (insulation material) 300 Spinning cylinder 301 Inner cylinder 302 Outer cylinder 303 Supply duct

Claims (7)

[Claims] 1. A melt spinneret pack body, a top insert having a polymer introduction hole, a polymer filter housed in the spinneret pack body, a bridge plate, and a spinneret having a number of spinning nozzles formed in an annular shape, In a melt spinneret pack in which a through hole for discharging cooling air is formed at the center thereof, the through hole is formed, and a center spacer having an inverted T-shaped cross section is integrally incorporated with the spinneret, and the polymer filter and A melt spinneret pack, wherein a polymer flow path having a substantially Z-shaped cross section is formed between the spinning nozzles. 2. The melt-spinneret pack according to claim 1, wherein the polymer flow path having a substantially Z-shaped cross section is formed by a bridge plate receiver incorporated between the center spacer and an inverted conical bridge plate. . 3. The method according to claim 1, wherein the through hole comprises a straight hole passing through the center of the pack formed in the center spacer and an oblique hole formed in the top insert. The melt spinneret pack according to claim 1 or 2, wherein the polymer conduction hole is symmetrically branched and opened from the introduction hole to a peripheral portion of a straight hole of the through hole. 4. The melt spinneret pack according to claim 1, wherein the through-hole portion of the spinneret is covered with a heat insulating material. 5. A heating spin block in which mounting holes for a plurality of melt spinneret packs and a polymer passage extending to each melt spinneret pack are formed, a melt spinneret pack, and a spun yarn are cooled. In a melt spinning device composed of a spinning cylinder, the spinning cylinder includes a gas-permeable inner cylinder surrounding a yarn spun from each melt spinneret pack, and an outer cylinder such as a group surrounding a plurality of the inner cylinders. A melt spinning device comprising a cooling air supply duct connected to the outer cylinder. 6. A melt spinning apparatus according to claim 5, comprising the melt spinneret pack according to claim 1, 2, 3 or 4. 7. The melt-spinning apparatus according to claim 6, wherein the annular spinning nozzle is divided into a plurality of groups, and the spun filaments of each group are collectively wound as individual yarns into a package.