JPS5914566B2 - Sea-island type composite fiber cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a die for sea-island composite fibers with improved spinnability.

Sea-island type composite fibers have been known for a long time, and various ferrules for sea-island type composite fibers have also been proposed.

In other words, for sea-island type composite fibers, it is said that the method of first forming a core-sheath type composite stream, then gathering a large number of these fibers in a molten state, and then spinning them out from a discharge hole is the best method in terms of the composite state. The sea-island composite fiber cap consists of at least three cap plates, and a radial flow path for the sea component is formed between the two cap plates placed directly above the lowest cap plate (collective cap plate). It is also known to have.

However, in all conventional caps, there is a so-called dead area where almost no sea component flows outside the inlet hole provided to guide the sea component toward the center of the circle, that is, into the radial sea component flow path. Space existed.

The present inventors have discovered that the sea component that stays in this area for a long time is thermally denatured, and that this thermally denatured sea component is a cause of yarn breakage. The present invention was arrived at as a result of various studies regarding the cap.

The present invention has the following configuration.

That is, the present invention comprises at least three or more cap plates and a tubular body, and a flow path for the sea component is formed between two cap plates disposed directly above the bottom plate of the cap plates. In a sea-island type composite fiber cap in which the tubular body is planted on one of the two cap plates, the outer diameter of the cap plate above the flow channel is equal to the outer diameter of the cap plate below the flow channel. This is a sea-island type composite fiber spinneret characterized by having a diameter smaller than the outer diameter, forming a sea component introduction path on the outer periphery of the upper die plate, and further providing connecting means for connecting the respective die plates to each other.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is an enlarged cross-sectional view showing the sea-island type composite fiber die of the present invention, and the island component A is the introduction hole 6 provided in the No. 1 plate 1
The liquid is discharged from the discharge hole 7 and flows into the tubular body 10 .

On the other hand, the sea component B is separated from the island component A by pressing the backing attached to the annular packing groove 16 provided on the No. 1 plate with an annular protrusion (not shown) provided on the pack. , along the outer circumferential walls of the No. 1 plate 1 and the No. 2 plate 2 into the radial ocean flow path 15, and flows into the tubular body 10 through the flow paths 9 and 8 while enveloping the island component.

Inside the tubular body 10, a core-sheath type composite flow is formed.
This composite flow passes through a flow path 11 provided on the No. 3 plate 3 and flows into the gathering portion 12 provided on the No. 4 plate 4.

A plurality of core-sheath type composite streams are collected in this gathering part 12 and spun out from the spinning hole 13 to form a sea-island type composite fiber.

Reference numeral 14 denotes a pressure plate whose purpose is to prevent deformation.

Note that the No. 1 plate 1 and the No. 2 plate 2 are connected and fixed to the No. 4 plate 4 via the pressure plate 14 and the No. 3 plate 3 with connecting bolts (not shown).

It is also possible to provide a plurality of pressure plates in the radial sea component flow path 15.

Furthermore, in such a sea-island type composite fiber cap, it is also possible to use the No. 2 plate 2 and the No. 3 plate 3 upside down, and in this case, the outer diameter of the No. 3 plate can be changed. It is good to keep the outer diameter of the No. 1 plate the same as that of the No. 4 plate, and the outer diameter of the No. 2 plate the same as the outer diameter of the No. 4 plate.

In this type of nozzle, by providing a metering hole on the discharge side of the No. 2 plate and using the tubular body or channel 11 of the No. 3 plate as the metering hole, it can be converted into a simple core-sheath type composite fiber nozzle. It becomes possible.

It goes without saying that such a core-sheath type conjugate fiber die has similar effects.

The upper outer diameter of the radial channel according to the invention is 1.5 mm to 10 mm, preferably 3 mm to 8 mm, than its lower outer diameter.
It is appropriate to make the diameter smaller by about mm, and it is preferable that the outer wall surface above the radial flow path be polished to be as smooth as possible.

In the nozzle of the present invention, the sea component flows without forming a dead space outside the sea component introduction hole for guiding the sea component into the radial sea flow path, which was observed in the conventional nozzle. Not only the breakage is greatly reduced and the operability is improved, but also the quality of the yarn is improved, and the die for sea-island type composite fiber of the present invention is extremely useful industrially.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the sea-island type composite fiber die of the present invention. 1: No. 1 board, 2: No. 2 board, 3: No. 3 board, 4: No. 4 board, 6
: Island component introduction hole, 7: Discharge hole, 8,9゜ICl3: Channel, 10: Tubular body, 12: Gathering part, 13: Spinning hole, 14:
Pressure plate, 16: Annular packing groove.

Claims (1)

[Claims] 1 Consists of at least three or more cap plates and a tubular body,
A flow path for the sea component is formed between two cap plates disposed directly above the bottom plate of the cap plates, and the tubular body is planted on one of the two cap plates. In the sea-island type composite fiber cap, the outer diameter of the cap plate above the flow path is smaller than the outer diameter of the cap plate below the flow path,
A sea-island type composite fiber die, characterized in that a sea component introduction path is formed on the outer periphery of the upper die plate, and a connecting means for connecting the respective die plates to each other is provided.