JPS6225763B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spinneret device for spinning an island-in-sea composite fiber.

Sea-island type composite fibers are multi-component fibers, also called polymer mutual array fibers, and when looking at its cross section, at least one component (island component) is highly distributed among other components (sea component). It is a fiber whose relationship is continuous in the fiber axis direction, and the usefulness of this fiber is well known.

Various ideas have already been made regarding spindle devices for spinning such fibers. However, the number of spindle devices that can stably and uniformly spin fibers and have practical value in an industrial sense becomes extremely small.
Among them, the ones that are considered to be particularly excellent are:
It is a mouthpiece device consisting of a combination of a hard plate having a pipe, a perforated hard plate, and a hard plate having a funnel-shaped part and a discharge hole.The pipe is inserted into the hole, and the island component flows through the pipe. The sea component passes through the gap created between the pipe and the hole (in the present invention, this gap is referred to as the annular part), and where they meet, a core-sheath composite flow is formed, and a large number of such composite flows are collected. There is an apparatus in which the liquid is introduced into a funnel-shaped part, and is discharged from a discharge hole while converging.

While such devices have many advantages, they also have many disadvantages. The more porous (multiple islands) the number of discharge holes in the same device, the more likely unevenness will occur between islands or between filaments spun at the same time.

The following countermeasures have been proposed to address this drawback, but they also have various drawbacks. Part 1
The first is to make the diameter of the hole forming the annular portion extremely close to the outside diameter of the pipe. This method is used when the pipe is bent, or when the direction of the pipe does not match the direction of the hole, the pipe adheres to the hole wall.
There are disadvantages that the core-sheath flow is not well formed and that the unevenness becomes worse in relation to processing accuracy.

Another is that the pipe within the annular portion is provided with a supporting protrusion, which is firmly fixed to the hole wall to ensure that the pipe is properly centered. In this case, it is also a good idea to provide a protrusion on the side of the hole and firmly support the pipe with the protrusion. A disadvantage of this method is that it is extremely difficult to create a support for the pipe, much less insert it snugly into the hole. When a large flat plate is used to provide a large number of discharge holes, simply supporting the plate will cause large discharge irregularities between the discharge holes located far apart. This is due to insufficient fluid regulation, as will be discussed later. In order to avoid this, if the support protrusion is made thick and large and firmly fixed, the fluid will be cut off at the annular part and it will be easy to prevent it from flowing as a sheath. This is particularly disadvantageous when spinning fibers with a high island ratio that has an extremely low sea component. Furthermore, it is extremely difficult to fit a pipe having a large number of protrusions tightly and precisely, so it is not suitable for spinning fibers with a large number of islands or simultaneous spinning of a large number of composite fibers.

Furthermore, when a large supporting protrusion is provided at the bottom of a pipe or hole that forms an annular portion, the sheath flow is clearly cut off, and the exposed core flow reaches the funnel-shaped portion, causing the flow to flow through the adjacent hole. It merges with the same exposed core stream discharged from the core stream, making it easy to spin composite fibers in which the islands are not sufficiently distributed. This phenomenon is particularly likely to occur when the island ratio is high.

Although they may seem very similar at first glance, the present inventors have studied various types of spinneret devices that do not have the above drawbacks, even though they have fundamentally different fluid regulation ideas, and have finally achieved stable and uniform spinning. They completed a possible sea-island composite fiber spinning spinneret.

The gist of the present invention is as follows.

(1) An island-in-the-sea composite fiber spinning spinneret characterized by comprising at least the following hard plate and pipe with a lower stage.

An introduction hole for introducing an island component,
A first hard plate having an introduction hole having a smaller diameter than the introduction hole in the second hard plate A first hard plate having an introduction hole corresponding to each pipe for introducing the island component introduced into the first hard plate into the stepped pipe. 2 hard plate 3rd hard plate for supporting the stepped pipe It has a hole for inserting the tip of the stepped pipe, and the hole is so narrow that it does not substantially contact the pipe at the entrance. part and
A fourth hard plate has a narrow part in which a wide part that allows free flow of the polymer is arranged, and the lower part of the narrow part is annular with a larger diameter. Stepped Pipe Fitted Across Hard Plate A fifth hard plate that aggregates and integrates the composite flow formed by the above hard plate and stepped pipe.The present invention will be explained in detail below.

FIG. 1 is a longitudinal sectional view of the device according to the invention. This invention shows a preferred embodiment of the invention, and it goes without saying that the invention is not limited thereto.

The first hard plate from the top is provided with a hole 1 into which a polymer (polymer A) to be an island component is introduced. Since the hole 1 is provided with a constricted portion at a portion thereof (most preferably at the bottom), the polymer A can be distributed more uniformly.

A hole 2 is provided in the second hard plate. The hole 2 serves to connect the hole 1 and the pipe 4, and has the effect of preventing the pipe 4 from slipping upward.

A pipe 4 is provided on the third hard plate. In order to prevent the pipe from slipping downward, a pipe with steps 3 as shown in the figure is used. Methods for setting the pipe include, in addition to the fitting method shown in the figure, methods such as screwing, fusing, and gluing, and are not particularly limited. Of course, it may also be formed integrally with the hard board.

A space 7 is partitioned between the third and fourth hard plates. The space 7 becomes a passage for the polymer (polymer B) which becomes the sea component. Since the route for introducing polymer B into the space 7 is not particularly limited, it is omitted in FIG. 1, but it is preferable to introduce it from above like polymer A.

A hole 6 is opened in the fourth hard plate. A pipe 4 is inserted into the hole 6, and a circular portion is formed between the hole 6 and the pipe 4. This annular portion provides fluid regulation for the polymer B, which effectively wraps around the polymer A passing through the pipe 4.

A feature of the present invention is that the function of fluid regulation in this annular portion is further strengthened and improved. That is, the fourth hard plate has a hole for inserting the tip of the stepped pipe, and the hole has a narrow part at the entrance part to the extent that it does not substantially contact the pipe, and a part where the polymer can freely flow. It has a narrow part in which a wide part is arranged, and furthermore, the lower part of this narrow part is annular with a larger diameter.

FIGS. 2 and 3 are enlarged views of the annular portion. FIG. 2 is a cross-sectional view, and FIG. 3 is a longitudinal cross-sectional view. A portion of the hole 6 is narrowed. In the present invention, this narrowed portion is referred to as a narrowed portion 5. This narrow portion 5 may be provided at any position in the hole 6, but it is preferably provided higher. Moreover, its shape is not limited to that shown in FIG. 2, and various modifications are possible. Some examples are shown in FIGS. 4a to 4k. FIG. 4 is a cross-sectional view of the narrow portion. It is best to change it depending on the cross-sectional shape of the pipe. For example, if the pipe is round, it is preferable that the shape is rotationally symmetrical, and in the example of Fig. 4, a, b, e,
f and g are preferred.

Such a narrow portion exists at the inlet portion and must be provided so that the pipe 4 inserted therein does not come into contact with the hole wall. (Of course, the pipe may bend during spinning and come into contact with the hole wall, but such contact is not a problem in this case.) Also, the tip of the pipe inserted into hole 6 should not touch the hole wall. The invention must be substantially straight. Here, "substantially straight" means that there are no protrusions for support, and there are no irregularities that do not cut the core flow (flow of polymer B) or make it difficult to insert the pipe. It means it doesn't matter if there is. The pipe must be long enough to remain in the hole and not protrude into the funnel. This makes it possible to form a complete core-sheath flow at the exit to the funnel without being interfered with by other combined flows, and also ensures that the pipe does not get in the way when removing the hardboard. This results in improved workability and other benefits.

A funnel-shaped portion 8 and a discharge hole 9 are provided in the lowermost hard plate. The funnel-shaped portion 8 serves to receive a large number of core-sheath flows discharged from the hole 6, converge them, and discharge them from the discharge hole 9 as a single composite fiber.

The device of the present invention consists of one or more hard plates. The number of hardboards is not limited. This can be made as a single piece depending on the need, or conversely, it can be made by piling up several pieces of hardboard, but in either case, the final product is a single piece. The effects of the invention are exhibited. 1st
The figure shows a preferred example of moderate division. From the viewpoint of ease of cleaning and processing, it can be said that a split type is preferable.

A variety of materials can be used for hardboard.
For example, various stainless steels such as SUS-32 and 27, iron, titanium, glass, quartz, ceramic materials,
These include gold, platinum, and special synthetic polymers. Of course, it is also possible to combine two or more types of materials.

The effects of the device according to the present invention are listed below.

(1) Uniform discharge between each hole in multi-hole discharge can be achieved.

(2) Difficulty in inserting pipes is greatly improved. The effect is particularly great when there are multiple islands (multi-type) and multiple discharge holes.

(3) Even if the pipe is slightly bent, it is unlikely to come into contact with the hole wall, and even if it does come into contact with it, the fluid regulating ability of the annular part will not be impaired and a stable core-sheath flow will still be maintained.

(4) Since there are no branch-like protrusions on the pipe, the pipe can be made easily and uniformly.

(5) The annular expansion below the narrow portion prevents the tip of the pipe from coming into contact with the wall of the insertion hole, thus making it possible to form a stable composite flow.

(6) The narrow part is created by simple machining of a hard plate, so it is uniform and highly accurate, and it is less likely to bend like a pipe.

(7) The narrow part also acts as a cradle to prevent the pipe from bending, so the pipe will not bend excessively.

(8) Since there is no forced insertion of the pipe, there is no bending of the pipe due to this.

(9) Since a stepped pipe is used as the pipe, and a second hard plate is essential to prevent it from falling out upwards, the pipe does not move either up or down, and the stability of the pipe is extremely good. be. Therefore, the clearance between the pipe and the fourth hard plate is stabilized, and a good core-sheath acid is formed.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the device according to the invention.
2 and 3 are enlarged views of the annular portion of the apparatus shown in FIG. 1, with FIG. 2 being a cross-sectional view thereof, and FIG. 3 being a longitudinal sectional view thereof. FIGS. 4a to 4k are diagrams showing various modifications of the cross-sectional shape of the narrow portion. 1, 2, and 6 are holes, 4 is a pipe, 5 is a narrow part of the hole 6, 7 is a space, 8 is a funnel-shaped part, and 9 is a discharge hole.

Claims (1)

[Scope of Claims] 1. An island-in-the-sea composite fiber spinning spinneret device, characterized by comprising at least the following hard plate and stepped pipe. A first hard plate having an introduction hole for introducing the island component, the diameter of which is smaller than the introduction hole in the second hard plate.The island component introduced into the first hard plate is introduced into the stepped pipe. A second hard plate having an introduction hole corresponding to each pipe for supporting the pipe; A third hard plate for supporting the stepped pipe having a hole for inserting the tip of the stepped pipe; , has a narrow part in which a narrow part that does not substantially contact the pipe and a wide part that allows free flow of polymer are arranged, and furthermore, the lower part of this narrow part has an annular shape having a larger diameter. A fourth hard plate with a stepped pipe fitted from the upper end of the third hard plate to the fourth hard plate. A fifth hard plate that collects and integrates the composite flow formed by the hard plate and stepped pipe from above. board