KR950013479B1 - A spinert for producing a hollow fiber - Google Patents

Abstract

The spinneret has a triangle shape for its longitudinal section and satisfies the following conditions to produce hollow filaments. The condition is 1.0 <=a<= 3.0, 0.04<=b<=1.0, 0.5<=c<=2.0, 1.0<=h<=3.0, 15≰<=θ<=45≰, wherein, a : spinneret inner dia(mm), b : slit spacing(mm), c : slit thickness(mm), h : spinneret length(mm), θ: spinneret discharge angle(≰). The hollow filament produced through the spinneret improves heat insulation and lightens weight.

Description

Spinnerets for manufacturing hollow fibers

1 is an enlarged cross-sectional view of a waterproofing prisoner of the present invention to form a filament.

Figure 2 is an enlarged longitudinal cross-sectional view of the spinneret of the present invention to form a filament.

3 (a), 3 (b), and 3 (c) are enlarged cross-sectional views of a conventional mold for producing hollow fibers.

4 is an enlarged longitudinal cross-sectional view of the hole for producing hollow fibers in FIGS. 3 (a) and 3 (b).

* Explanation of symbols for main parts of the drawings

a: Internal diameter of the spinneret (mm) b: Spacing of the slits (mm)

c: Thickness of slit (mm) h: Length of spinning discharge hole (mm)

θ: angle of radiation discharge hole (°)

The present invention is to produce a hollow fiber by melt spinning a thermoplastic polymer, to impart a natural sense to the polyester fiber, to impart resilience and drape in the liveness, and to provide a hollow fiber for providing insulation and light weight by the hollow portion The present invention relates to a spinneret, which maintains a stable spinning state and increases a hollow ratio, and thus relates to a waterproof collar that can produce hollow fibers of uniform quality.

The hollow fiber has a smaller apparent specific gravity, a greater sublimeness, and is suitable for a garment fiber having good heat retention as the hollow portion at the center thereof is larger.

As a spinneret for manufacturing hollow fiber by the conventional melt spinning method, the annular shape having a portion where a part of the spinneret is broken is formed in the annular shape (FIG. 3 (a), the hollow polygonal slit hole (FIG. 3 (b))) Although spinnerets with double annular holes (figure 3 (c)) having a gas supply part have been used, in the case of degree 3 (a), good hollow ratio is not guaranteed, and thus, good heat retention and lightness are not expressed. In the case of the supplemented FIG. 3 (b), it was difficult to obtain a high hollow fiber due to the latent elastic properties of the molten polymer.

In order to prevent the decrease of the hollow rate due to the viscoelastic properties of the molten polymer, as shown in FIG. It is possible to prevent the hollow rate from decreasing, but when the difference in the degree of air supply of each annular hole occurs, it is difficult to produce a fiber having a uniform hollow rate. There was a case.

Accordingly, an object of the present invention is to solve this disadvantage, and to provide a spinneret for obtaining a yarn that gives a heat retention and lightness by forming a good hollow. The existing hollow-formed spinneret formed the hollow part using the slit between the slits using a part of the broken slit, but the hollow formation rate was 5-10%, and the hollow formation rate was low.

In order to solve this problem, the present invention increases the hollow formability by giving an angle such that the central portion of the spinneret becomes a triangle. The portion of FIG. 2 (a) has a larger slope than that of the existing detention to facilitate the flow of the molten polymer, and the flow of the molten polymer has a larger slope than the existing detention at the time of spinning due to the slope of the portion of FIG. Due to the inclination of the second part (b), the swelling phenomenon was better than that of the existing detention during spinning, resulting in a fiber having a hollow ratio of 15-20% in the stretched state after cooling.

a is 1.0 ≦ a ≦ 3.0, b is 0.04 ≦ b ≦ 1.0, and the units of a and b are mm. If a is less than 1.0 mm, the hollow part is small, and thus heat insulation, light weight, etc. are insufficient, and if it is more than 3.0 mm, there is a risk of breaking the hollow. The possibilities are great. h is 1 ≦ h / a ≦ 3. When the range of h / a is smaller than 1, it is difficult to obtain a good hollow fiber, and when it is larger than 3, the workability is poor due to a decrease in radioactivity. In addition, c is 0.5 ~ 2mm is effective, if less than 0.5mm the production of hollow fibers is difficult, if more than 2, the lightness is reduced. θ is 15 ° ≤ θ ≤ 45 °, if less than 15 ° hollow formability is insufficient, if it is larger than 45 ° it is difficult to manufacture the spin hole, the radiation is severe short cut occurs during workability is poor workability.

Hollow fiber spun by using the spinneret described above is natural, lively, warm and lightweight.

The following examples and comparative examples further illustrate the invention but do not limit the scope of the invention.

Example 1

PET having an intrinsic viscosity of 0.65 was melted at 285 ° C. to spun hollow fibers using spinnerets shown in FIGS. 1 and 2. The formation of the spin hole maintains the slit spacing (b) of 0.15 mm, the spinneret has an internal diameter (a) of 1.5 mm, a thickness of the slit (c) of 0.5 mm, θ is 30 ° and h / a is 2 Was used. Physical properties of the yarn spun by using the spinneret of the present invention are shown in Table 1.

Comparative Example 1

In the same conditions as in Example 1 PET and spinning conditions, θ was 10 ° and h / a was 2, and the physical properties of the yarns are shown in Table 1.

TABLE 1

* Assessment Methods

1) Outbreak and Drape: evaluated by 20 skilled workers

2) Warmth and lightness: evaluated by hollow rate

Hollow rate over 20% Good, 10 ~ 20% Normal, Less than 10%

3) Radioactivity: Good than 95% of full bobbin, 95 ~ 90 normal, less than 90% poor.

4)

Claims (1)

A spinneret for the production of hollow fibers in which the longitudinal section of the spinneret is triangular and satisfies all of the following conditions. 1.0? A? … … … … … … … … … … … … … … … … … (One) 0.04 ≦ b ≦ 1.0... … … … … … … … … … … … … … … … … (2) 0.5? C? … … … … … … … … … … … … … … … … … (3) 1.0 ≦ h / a ≦ 3.0... … … … … … … … … … … … … … … … … (4) 15 ° ≤θ≤45 ° … … … … … … … … … … … … … … … (5) here, a: Internal diameter of the spinneret (mm) b: Spacing of the slits (mm) c: thickness of the slits (mm) h: length of the discharge hole (mm) θ: angle of radiation discharge hole (°)