JPS6233021Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a spinneret for multi-filament yarns that is effective in reducing variation in fineness among single yarns.

In order to improve productivity, it is common practice to discharge a large number of filaments of multiple threads from the same spinneret and spin them. The multi-filament spinneret used in this spinning process has multiple polymer discharge holes (the number of threads is The method is to divide and arrange them into groups of the same number as . An example of this divided arrangement (for two threads) is shown in FIGS. 1 and 2.

Figure 1 is a plan view of a conventional spinneret;
The figure is a cross-sectional view taken along the - arrow in FIG. 1. Reference numeral 11 indicates a polymer discharge hole. When arranged in such a divided manner, the intervals between the polymer discharge holes become non-uniform. The molten polymer is evenly distributed on the spinneret plate within the spinning pack by a material for removing foreign matter and a perforated plate, but if the spacing between the polymer discharge holes is uneven, the polymer may be distributed at a position where the discharge hole spacing is wide. More polymer is ejected from a certain ejection hole (the ejection hole in the shaded area 12 in FIG. 1) than from other ejection holes, and the single fiber tends to become thicker, which tends to cause variation in fineness among the single yarns.

In order to prevent this variation in fineness between single yarns, it is possible to widen the spouting hole spacing as a whole to reduce unevenness in the spouting hole spacing, but in this method, the size of the spinneret However, it has the drawback of increasing the weight and is not a practical solution.

Therefore, the present invention was developed with the aim of reducing the above-mentioned variation in fineness between single yarns. The upper metal plate part 1 is arranged and drilled at intervals, and a large number of polymer discharge holes 5 are divided and arranged and drilled in a plurality of groups, and
A spinneret comprising a lower spinneret plate portion 3 in which a polymer transfer channel 2 is bored that communicates with both the polymer discharge hole and the polymer flow channel hole, and one of the polymer flow channel holes is The spinneret for multi-filament yarn is characterized in that at least a part of the position is different from the position of the polymer discharge hole.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 5.

3 and 4 are plan views showing the upper and lower nozzle plate parts, and FIG. 5 shows a spinneret formed by connecting the upper and lower nozzle plate parts of FIGS. 3 and 4. FIG.

As described above, the spinneret of the present invention has an upper spinneret plate 1 in which polymer flow passage holes are arranged and bored at equal intervals.
and a lower spinneret plate part 3 in which a polymer transfer channel is drilled and polymer discharge holes are divided and drilled into a plurality of groups. When the molten polymer flows into the holes 2, the polymer flows almost uniformly into all the polymer channel holes, and the polymer uniformly spread into each hole flows through the polymer transfer path 4 into the polymer discharge hole 5. It's there. Therefore, even if the polymer discharge holes 5 are arranged unevenly, such as by dividing them into a plurality of groups, it is possible to significantly reduce the variation in the amount of polymer discharged between the holes.

The upper spinneret plate part 1 has a large number of polymer flow passage holes 2 formed at equal intervals on the circumference, and the arrangement of the holes is determined according to the polymer discharge of the spinneret when spinning one thread per spinneret. This arrangement is used as a hole arrangement, and is an effective arrangement for allowing the molten polymer, which is uniformly distributed on the spinneret plate within the spinning pack, to uniformly flow into each hole. The number of polymer channel holes 2 is:
The number is the same as the number of polymer discharge holes 5 in the lower metal plate.
Further, the positions of the polymer flow passage holes 2 are different from the positions of the polymer discharge holes 5 for all or some of the holes, that is, the positions of the polymer flow passage holes 2 and the polymer discharge holes 5 There may be some items in the same position as .

It is preferable that the polymer channel hole is provided with a constriction part 2' at the outlet end thereof, similar to the discharge end of a normal polymer discharge hole, in order to improve the metering performance of the polymer.

The lower spinneret plate 3 is provided with a polymer transfer channel 4, and similar to the conventional spinneret for multi-filament yarns,
A large number of polymer discharge holes 5 divided into a plurality of groups
This polymer discharge hole is divided into groups of the same number as the number of threads. It is preferable that the interval between these groups be wide in order to facilitate the yarn dividing operation during winding and to prevent single yarn movement between the yarns.

For example, it is desirable that the distance between the discharge holes within a group is 6 mm or more to prevent fusing between single yarns, and the distance between the discharge holes between different groups should be 25 mm or more from the standpoint of workability. Preferably.

The polymer transfer channel 4 is connected to the polymer channel hole 2.
Since this is for moving the polymer discharged from the hole to the position of the polymer discharge hole 5, it is not particularly necessary to provide it if the polymer flow path hole and the polymer discharge hole are in the same position. (Such a case is not shown.) It is preferable from the point of view of the drilling operation that the polymer transfer passage 4 is groove-shaped as shown in FIGS. 4 and 5.

The lower metal plate part 3 may be composed of two parts: a lower metal plate part (middle) in which the polymer transfer passage 4 is bored and a lower metal plate part (lower) in which the polymer discharge hole 5 is formed. In this case, a hole-shaped polymer transfer passage is required even when the polymer flow path hole 2 and the polymer discharge hole 5 are located at the same position.

Next, the effects of the present invention will be explained using examples.

Example Using a spinneret with a spinneret diameter of 100 mmΦ and a discharge hole diameter of 0.3 mmΦ, which has a polymer flow path hole, a polymer transfer passage, and a polymer discharge hole in the same position as the spinneret shown in FIGS. 3 and 4, nylon 6, 40 denier 10 The filament yarn was spun into two yarns at a spinning speed of 900 m/min and wound. The variation in fineness between single yarns of this undrawn yarn was 1.6% in cross-sectional area. The cross-sectional variation rate is
Measure the diameter of each single yarn from the cross-sectional photograph of the undrawn yarn, calculate its cross-sectional area (XI), determine the average single yarn diameter value ( ) and standard deviation value (σ _o-1 ), and calculate using the following formula. did.

In addition, in the spinneret used for this spinning, the upper spinneret plate has 20 polymer channel holes arranged at 9.5 mm intervals on the same circumference.
The holes were arranged, and the polymer discharge holes were arranged in the lower metal plate part with a discharge hole interval of 10 mm within a group and a discharge hole interval of 46 mm between groups.

Comparative Example Nylon 6 yarn was spun and wound in the same manner as in the previous example, except that a spinneret having polymer discharge holes in the same position as the spinneret shown in FIGS. 1 and 2 was used. The variation in fineness between single yarns of the obtained undrawn yarn was 3.3% in cross-sectional area. In this spinneret, the distance between polymer discharge holes within a group was set at 10 mm, and the distance between discharge holes between groups was set at 46 mm.

In this way, when the spinneret of the present invention is used,
Even though the positions of the polymer discharge holes are non-uniform, the variation in fineness between single yarns can be greatly reduced. Therefore, the spinneret of the present invention is a multi-filament spinneret useful for preventing variations in fineness during multi-filament spinning. In addition, when spinning multiple threads, the group spacing can be increased without affecting the variation in fineness between single threads, which is particularly useful when increasing the number of threads, such as 3 or 4 threads. be.

[Brief explanation of the drawing]

1 and 2 show a conventional two-filament spinneret, with FIG. 1 being a plan view and FIG. 2 being a sectional view taken along the arrow - in FIG. 3 to 5 show an embodiment of the spinneret of the present invention (for two threads), and FIGS. 3 and 4 are plan views showing the upper and lower spinneret plate parts, respectively. Figure 5 shows a spinneret consisting of the upper and lower spinnerets in Figures 3 and 4.
FIG. 1=upper metal plate part, 2=polymer channel hole, 3=lower metal plate part, 4=polymer transfer channel, 5=polymer discharge hole.

Claims (1)

[Scope of utility model registration request] A large number of polymer flow holes are arranged at equal intervals on the circumference,
an upper metal plate portion formed with holes, and a polymer transfer flow in which a large number of polymer discharge holes are divided into a plurality of groups, arranged and drilled, and communicate with both the polymer discharge holes and the polymer flow path holes; A spinneret comprising a lower spinneret plate having a passage formed therein, and the position of at least a part of the polymer flow passage hole is different from the position of the polymer discharge hole. Spinneret for multi-filament yarns.