JPS60110908A - Spinneret part device - Google Patents

Abstract

PURPOSE:The titled device, having protruding members for dividing extrusion outlets into plural groups provided under or at the bottom of a spinneret, and capable of giving easily fibers with little unevenness of physical properties between fibers. CONSTITUTION:A spinneret part device having members equipped with protrusions 3 at the undersurface 2 of a spinneret for dividing extrusion outlets 1 into several groups with protruding members. The shape of the protruding parts may be rectangular, circular or triangular, and may take various shapes. The height of the protruding parts from the spinneret surface can be suitably selected according to the output, spinning temperature, spinning speed, etc. to reduce remarkably the uneven orientation degree in fibers.

Description

[Detailed description of the invention] (Technical field) The present invention relates to a spinneret device.

(Prior art) Reducing the unevenness of orientation in the cross-sectional direction of single fibers and the unevenness of orientation between single m fibers in a fiber bundle is necessary for improving the strength of fibers, preventing color unevenness, etc. It is. Furthermore, for optical fibers and other devices that utilize the refractive index of light, disturbances in the orientation of the fibers are an extremely troublesome problem because it also leads to fluctuations in the refractive index.

Various measures have been taken to prevent such troubles. A typical example is to install a device under the spinneret that blows cold air from all directions to make the orientation of the fibers uniform. By this means, the difference in the degree of orientation within the fiber bundle was reduced compared to the conventional method. However, in the case of a large nozzle, even if such measures are taken, there is a large difference in the degree of orientation between the fibers discharged from the center of the nozzle and the fibers discharged from the outer periphery, resulting in problems such as color unevenness. . In particular, when fibers with irregular cross sections or thick yarns are spun, large degree of orientation unevenness occurs in the cross-sectional direction of the single fibers, which is a cause of trouble.

There are also attempts to equalize the degree of orientation within the single fibers by installing a heat-retaining section under the cap.Such attempts are certainly more uniform than conventional methods, but they are fundamentally However, it was not possible to prevent unevenness between single fibers.

(Objective of the present invention) In view of the above situation, the present invention has been arrived at as a result of diligent investigation, and the object of the present invention is very simply:
The object of the present invention is to provide an apparatus for producing fibers with less unevenness.

(Structure of the present invention) The present invention has the following structure in order to achieve the above object. That is, the present invention relates to a spinneret device characterized in that the spinneret device has a convex member below the spinneret or at the bottom of the spinneret that divides the discharge ports into a plurality of groups.

This will be explained in more detail below.

For ease of understanding, the explanation will be based on specific examples shown in the figures, but it goes without saying that the present invention is not limited to these.

FIG. 1 is a cross-sectional view of the vicinity of the discharge port of the nozzle according to the present invention, where 1 is the discharge port, 2 is the lower surface of the nozzle (fiber discharge surface), and 3 is a convex portion around the discharge port. FIG. 2 is a plan view of the nozzle viewed from the discharge port surface.

In the present invention, as shown in FIG. 2, the nozzle outlet is divided into several groups by convex objects. The protrusion does not necessarily have to be integral with the base as shown in FIG. 3, but may be separated from the base.

The number of discharge ports in a group in the convex portion varies widely depending on spinneret size, spinning conditions such as spinning temperature, etc., and cannot be generalized.

Also, the number of groups to be classified cannot be determined. However, especially when each single fiber is to be made uniform, it is preferable to have one discharge port in one section, as shown in FIG. 5, for example.

Moreover, it is not necessary that all of the mouthpiece discharge ports be surrounded by the convex object. The fact that a part of the mouthpiece discharge port is surrounded by a convex portion as shown in FIGS. 11 and 12 is also very advantageous in that the present device is easier to manufacture.

Next, the shape of the convex portion can take various forms.

That is, they may be continuous as shown in FIG. 2, or may be independent as shown in FIG. Further, as shown in FIG. 11, the height of the convex portion from the base surface does not need to be constant.

It is preferable to adjust the temperature appropriately depending on the temperature of the fiber under the die. In addition, as shown in Figs. 13 and 14, slits may be provided in some of the convex portions, or many holes may be provided. It is also effective to pull the I.

The size of the slit, pii, etc. vary widely depending on the spinning temperature, spinning conditions, etc., and cannot be generalized. Furthermore, as shown in FIG. 15, it is very effective to provide a heat generating part or a cooling part in one part of the convex part to control the cooling of the fibers. Heat generation can be achieved by various means, such as indirectly using a dielectric heating element in the area. Furthermore, the cooling u1 can also be achieved by using an electronic refrigeration element or the like.

The height of the convex object from the spinneret surface can be appropriately selected depending on the discharge ω, spinning temperature, spinning speed, etc. However, even if the sharpener used to make the fineness is relatively short, it is highly effective, and the longer the fineness is, the better. However, the height of the convex object is at least 5
It is preferable that it is equal to or higher than the threshold.

Further, the angle of the center line of the convex object with respect to the base surface does not necessarily have to be perpendicular. It is also effective to align it with the spinning take-up shaft.

In the drawings of the present invention, 3 has a rectangular shape in a plan view, but it does not necessarily have to be rectangular. Needless to say, it may be circular or triangular. Further, the discharge port does not need to be limited to a circular shape either.

The present invention relates to the lower part of the cap, and is not limited to the upper cap. Therefore, it is very effective to incorporate the present device into a conventionally known cap. In particular, it is very effective to apply this apparatus to spinning of multiple components, high-speed spinning, etc. Among multiple components, it can be particularly effectively applied to core-sheath type, multi-core-sheath type, and the like.

In any case, the device of the present invention can also be incorporated into conventionally known caps.

The apparatus of the present invention can be applied to all conventional spinning methods.

Why does this device produce uniform 18911?
Although the details are unknown, it is likely that the atmosphere under the spindle for each single meter fiber (for melt spinning, the temperature, dryness and humidity 1 (for melt spinning, temperature, solvent concentration, etc.) can be made almost the same, and that the inner layer and outer layer within the single fiber This is thought to be because it is easy to make the cooling temperature noise almost the same.

(Effects of the present invention) By adopting the above configuration, the present invention exhibits the following effects.

(1) Fibers with little variation in physical properties between single fibers can be easily produced.

(2) If you set the length of the convex part under the cap appropriately,
The unevenness of orientation within a single fiber can be greatly reduced.

(3) In particular, when this device is applied to a core-sheath type or a multi-core-sheath type spinneret, the composite yarn can be spun satisfactorily.

(4) High viscosity, high melting point components can be spun well.

(5) Good high-speed spinning is possible.

[Brief explanation of drawings]

1 to 16 show examples of the apparatus according to the present invention, and FIG. 1, FIG. 3, FIG. 5, FIG. 7, FIG. 9, FIG. 11, FIG. Figure 15 is a cross-sectional view, Figure 2,
Figures 4, 6, 8, 10, 12, 14
Figures 1 and 16 are plan views thereof. In the figure, 1 is the discharge port, 2 is the lower surface of the mouthpiece (fiber discharge surface), 3 is the convex part around the discharge port, 4 is the slit in the convex part, 5 is the heating element, 6 is the insulating part, and 7 is the cooling part. . Patent Applicant Higashi Shi Co., Ltd. Company Leaf 2s3 39 竿imaguchi No. 59 Puncture C Mouth Rll Co Calculation Bω 9-ytoLi] Presentation 12 Plot Calculation 5) i] 16th day

Claims (1)

[Scope of Claims] (Li. A spinneret device, characterized in that the spinneret device has a convex member below the spinneret or at the bottom of the spinneret that divides the discharge ports into a plurality of groups. (2) Patent The spinneret device according to claim (1), characterized in that the number of discharge ports in the group is one.