JPH08120515A - Spinneret - Google Patents

Abstract

PURPOSE: To provide a spinneret which can melt-extrude desirable filaments without exchange of the spinneret, even when the dope is changed to the one different in viscosity in the spinning of conjugated yarns. CONSTITUTION: This spinneret has an outer spinneret plate 3 having holes 32 which connect to spinning orifices opening at a bottom surface and open on the upper surface, an inner spinneret plate 2 which is placed on the outer spinneret plate 3 and has fine-tubular inner orifices extending into the hole 32, and a cavity 20 which is formed around the opening of the holes 32 and connected to the holes, where the inner orifices and the cavity are connected respectively to different kinds of spinning dopes and a doughnut type disk spacer is detachably attached to the periphery of the opening for the holes 32 on the outer spinneret plate.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a spinneret for spinning composite segments.

[0002]

2. Description of the Related Art Conventionally, a filament having a composite segment whose cross section is shown in FIG. 4 is known. FIG. 4 shows a filament having a composite segment composed of two components having different properties, that is, a first spinning component A segment that is a white portion and a second spinning component B segment that is a shaded portion. Such filaments have already been put into practical use at present. For example, in the case of a filament in which the component A is nylon and the component B is polyester, each has its own advantages, such as the tensile strength of nylon and the heat resistance of polyester. It is possible to obtain an excellent textile product which compensates for the disadvantages of the above.

As a spinneret for obtaining a filament having such a composite segment, a spinneret having a shape as shown in FIG. 3 is mainly used. In the spinneret shown in FIG. 3, the spinning solution of component A is discharged from the inner orifice to the introduction hole, and the spinning solution of component B is discharged from the liquid reservoir to the introduction hole, and these are spun out from the outer orifice while forming a laminar flow. As a result, a filament having a desired cross section as shown in FIG. 4 is spun.

[0004]

However, when the spinning solution is changed to one having a high viscosity or vice versa, even if the spinning die shown in FIG. It tends to have a distorted cross section as shown in Fig. 6,
The desired filament may not be obtained. The filaments of the cross section shown in FIG. 5 and FIG. 6 are not desirable filaments because the shortcomings of the respective components remain or tend to remain.

That is, when the viscosities of the spinning solutions A and B are within a certain range, desired filaments can be obtained by adjusting the spinning conditions such as temperature and pressure. On the other hand, when the viscosity of the spinning solution B is clearly high or, conversely, low, there is a limit only by adjusting the spinning conditions, and the thickness t of the spinning die reservoir (see FIG. 3).
And it is necessary to change the diameter D (see FIG. 3) of the introduction hole opening. Changing to a spinneret with a different thickness of the liquid reservoir and a different diameter of the introduction hole opening according to the change of the combination of the spinning liquids takes time for delivery and also requires a large expenditure, which is a headache for those skilled in the art. It was a challenge.

The object of the present invention is to provide a method which can be dealt with so that the desired filament can be spun out without changing the basic specifications of the spinneret, even when the spinning solution is changed to have a different viscosity. To provide.

[0007]

In order to achieve the above object, the present invention has the following constitution. That is, the spinning spinneret of the present invention comprises an external spinneret plate having an introduction hole opening on the upper surface, which communicates with a spinning orifice opening on the lower surface, and a thin tubular interior laminated above and projecting into the introducing hole. An internal spinneret plate provided with an orifice and a liquid reservoir communicating with the introduction hole and provided around the opening of the introduction hole are provided, and the internal orifice and the liquid reservoir are respectively connected to different kinds of spinning liquid supply units. In such a spinning spinneret, a donut-shaped disk-shaped spacer is detachably adhered to the periphery of the introduction hole opening on the upper surface of the outer spinneret.

[0008]

In the spinning die of the present invention, the doughnut-shaped disk-shaped spacer is attached to and detached from a combination of spinning liquids having a wide viscosity without changing the outer die plate and the inner die plate. , Can be dealt with. The doughnut-shaped disk-shaped spacer plays a role of adjusting the thickness t of the liquid reservoir and the diameter D of the introduction hole opening in accordance with the viscosity of the spinning solution B, and is important in the present invention.

[0009]

Embodiments of the present invention will be specifically described below. 1 and 2 show one embodiment of the mouthpiece of the present invention. As is clear from the figure, the spinning die 1 of the present invention is
It is composed of an inner die plate 2, an outer die plate 3, a support frame 5 for laminating and supporting these, and a donut-shaped disc-shaped spacer 7.

The inner mouth plate 2 is provided with a thin tubular internal orifice 10 projecting downward from the bottom surface, and an end 12 thereof is opened. Further, a liquid reservoir 20 concentric with the internal orifice 10 is formed on the bottom surface. It is provided. Internal orifice 1
0 communicates with a passage 14 provided so as to open on the upper surface, and the liquid reservoir 20 has a passage 2 provided so as to open on the upper surface.
It communicates with 2. In particular, it is necessary to make the thickness t of the liquid reservoir thicker than the liquid reservoir thickness t of the conventional spinneret 46 shown in FIG.

The external mouth plate 3 is provided with an external orifice 30 opening to the lower surface and an introducing hole 32 communicating with the external orifice 30 and opening to the upper surface. The introduction hole has a cylindrical shape, and the tip 12 of the thin tubular internal orifice 10 enters the inside thereof, and the introduction hole opening 34 on the upper surface corresponds to the liquid reservoir 20 in a concentric circle shape. It is necessary to make the diameter of the liquid reservoir 20 longer than the diameter of the introduction hole 32. (In FIG. 2, the position of the introduction hole opening 34 on the upper surface of the outer mouth plate 3 corresponding to the inner orifice 10 and the liquid reservoir 20 is shown by a dotted line.)

A gasket 9 is used on the joint surface (contact surface) between the inner mouthpiece plate 2 and the outer mouthpiece plate 3, but the gasket can be omitted. However, the joint surface between the inner mouth plate 2 and the outer mouth plate 3 needs to be in close contact with each other.

The doughnut-shaped disk-shaped spacer 7 has an inner diameter equal to the inner diameter of the introduction hole 32, and an outer diameter may be a length that can be inserted into the liquid reservoir 20. As described above, this spacer adjusts the thickness t of the liquid reservoir and the diameter D of the introduction hole opening by adjusting the viscosity of the spinning solution B. When the viscosity of the spinning solution B is low, a thick spacer is used. In the opposite case, a thin one may be used or a spacer may not be used. When the spacer is used, it is closely fixed to the upper surface of the outer die plate 3 by the pin 36 with its inner diameter aligned with the introduction hole.

It is also possible to make the upper edge of the inner diameter of the spacer wider above the edge (see FIGS. 1 and 7), whereby the diameter of the upper edge of the inner diameter becomes slightly larger than the inner diameter of the introduction hole. Particularly suitable when the viscosity of the spinning solution B is high.

Next, the flow of the spinning solution at the time of spinning using the spinneret 1 of the present invention will be described. As the spinning solution used in this example, polyester was used as the component A and nylon was used as the component B, but it is not necessary to limit to these, and the component A and the component B can take advantage of each other's respective merits and A combination that can complement the disadvantages is preferable.

First, the spinning solution A is extruded from the internal orifice 10 into the introduction hole 32 through the passage 14. On the other hand, the spinning solution B is pushed out into the introduction hole 32 through the passage 22 and the liquid reservoir 20. At this time, the spinning solution B is extruded into the introduction hole so as to wrap the spinning solution A from the inner orifice 10, and both spinning solutions extruded into the introduction hole are spun from the outer orifice 30 while forming a laminar flow. . The cross section of the filament 40 spun in this way is, as shown in FIG.
It can be easily seen that the segment A is located near the center and the segment B surrounds the periphery.

In the above embodiment, the liquid reservoir is provided on the bottom surface of the inner mouth plate 2, but as another embodiment, the liquid reservoir is provided on the upper surface of the outer mouth plate 3 (see FIG. 7). Or provided on both the inner mouth plate 2 and the outer mouth plate 3 (not shown)
It is also possible.

Further, in the above embodiment, the number of external orifices 30 provided in one external mouth plate 3 is plural,
Although an example in which they are arranged in one row is shown, the spinning spinneret of the present invention does not have to be limited to the above, and the number of the external orifices 30 may be only one, or in the case of plural, it may be arranged in plural rows. It is possible to arrange them in parallel and to arrange them on concentric circles. In either case, it is needless to say that the internal orifice plate 2 provided with the internal orifice 10 and the liquid reservoir 20 corresponding to each of the external orifices 30 must be used.

[0019]

As described above, the spinning spinneret according to the present invention can be used in combination with a donut-shaped disk-shaped spacer to stably spin desired filaments as shown in FIG. Therefore, it is clear that the spinning die of the present invention is highly practical.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a spinneret showing an outline of one embodiment of the present invention.

FIG. 2 is a bottom view of the inner mouth plate shown by XX ′ in FIG.

FIG. 3 is a cross-sectional view of a conventional spinneret.

FIG. 4 is a cross-sectional view of a preferred composite segment yarn.

FIG. 5 is a cross-sectional view of a distorted composite segment yarn.

FIG. 6 is a cross-sectional view of a distorted composite segment yarn.

FIG. 7 is a vertical cross-sectional view of a spinning die of the present invention showing another embodiment different from FIG.

[Explanation of symbols]

 1 Spinneret of the Present Invention 2 Internal Spindle Plate 3 External Spindle Plate 5 Support Frame 7 Donut-shaped Disc Spacer 9 Gasket 10 Internal Orifice 12 Tip of Internal Orifice 14 Passage 20 Liquid Reservoir 22 Passage 30 External Orifice 32 Introducing Hole 34 Introductory hole opening 36 Pin 40 Filament 42 Segment A 44 Segment B 46 Conventional spinneret

Claims (1)

[Claims] 1. A communicating with a spinning orifice opening on the lower surface,
An outer die plate having an introduction hole opened on the upper surface, an inner die plate laminated above and provided with a thin tubular internal orifice projecting into the introduction hole, and further communicating with the introduction hole, the introduction hole opening In a spinning spinneret provided with a liquid reservoir provided around the spinneret, wherein the internal orifice and the liquid reservoir communicate with different kinds of spinning liquid supply parts, a donut-shaped circle around the introduction hole opening on the upper surface of the external spinneret plate. A spinning spinneret characterized in that a plate-shaped spacer can be detachably attached.