KR19990007736A - Deformed cross-section polyester yarn and its manufacturing method - Google Patents

Abstract

The present invention has three to five protrusions in a cross-section, so that the ratio of the thickness of the protrusion to the thickness of the contact portion is 1.0 to 1.3, so that the semi-closed water transfer passage is formed to form three to five in the longitudinal direction of the yarn Cross section polyester sign.

Said yarn is to be produced by melt spinning using spinnerets having three to five protruding prisoners arranged at equal intervals around a central prisoner.

Description

Deformed cross-section polyester yarn and its manufacturing method

The present invention relates to a release cross-section polyester yarn having three or more protrusions and a method of manufacturing the same.

Polyester is widely used as a medical material, and has the advantages of having excellent physical and chemical durability. However, the hygroscopicity is lowered compared to natural fibers such as silk, wool, cotton, and hemp. There is a disadvantage that it is inadequate for advanced medical use due to its low capacity.

In order to improve the hygroscopicity of the polyester yarn, there is a manufacturing method of having a permanent antistatic performance by copolymerizing or blending chemical components in the polymer stage, but this has excellent antistatic performance, but uses the principle of discharge of static electricity rather than actual hygroscopicity. Absorption capacity of does not improve. Korean Patent Publication No. 96-23312 proposes a method of manufacturing a H-shaped cross section as a method for imparting hygroscopicity to a polyester yarn, but has a disadvantage in that the moisture absorption capacity is not satisfactory because the movement path of water is limited to two places. (Korean Patent Publication Nos. 95-719)

The present inventors provide three or more water movement passages on the surface of the yarn to improve the absorption speed by increasing the movement speed of the water, and to improve the absorption speed, the water movement passage is not closed, as opposed to the general triangular cross section. I found it good to be my brother.

The present invention has a technical problem to provide a release cross-section polyester yarn having three or more semi-closed water transfer passage in the longitudinal direction of the yarn to improve the hygroscopicity of the polyester yarn and its manufacturing method.

1 is an enlarged plan view for explaining a cross-section of a shaped section yarn having four protrusions;

2 is another enlarged plan view for explaining a cross-section of a shaped section yarn having four protrusions;

3 is an arrangement diagram of a spinneret for manufacturing a mold cross section yarn having three protrusions;

4 is an arrangement diagram of a spinneret for manufacturing a cross-section yarn having four protrusions;

5 is an arrangement diagram of a spinneret for manufacturing a sectioned yarn having five protrusions;

Hereinafter, the present invention will be described in detail by way of example.

The present invention has three or more spherical protrusions (b) on the tangential line of the yarn cross section as shown in FIG. 1 and each of the spherical protrusions is longer than the thickness of the contact portion and thus has three or more semi-closed water moving passages (a). A cross-sectional polyester yarn and a method for producing the same.

When the area ratio of the inner circle and the outer circle is called the degree of release, the degree of release in the present invention should be maintained at 10 to 50%, preferably 20 to 40%.

If the degree of release is less than 10%, the moisture absorption rate is lowered. If the degree of release is more than 50%, the moisture absorption rate is increased, but cross-sectional formation is difficult, resulting in poor cross-sectional uniformity and poor dyeability.

In addition, in the present invention, the thickness of each protrusion must be greater than the thickness of each contact portion, and the thickness ratio must satisfy the following conditions so that the moving passage of moisture can be kept closed, and as a result, it can exert sufficient moisture absorption effect.

Control of this degree of release is possible by controlling the viscosity, spinning temperature, cooling wind speed and winding speed of the polyester polymer using an appropriate spinneret.

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If the thickness ratio is smaller than 1.0, sufficient moisture absorption is not exhibited. If the thickness ratio is larger than 1.3, fusion with adjacent protrusions may occur, causing trimming during spinning.

In the present invention, the more the number of the protrusions (b) tends to increase the hygroscopic ability, but if more than six, the moisture absorption path is narrow, the hygroscopic capacity is not only lowered, but also has a disadvantage of increasing the radiation trimming rate three It is preferred to have from five to five protrusions.

The spinneret used in the present invention has three protrusions (b) centered around a circular hole, and arranges three smaller holes at a 120 degree angle, and has four protrusions smaller than the center hole. In order to have four detention holes at an angle of 90 degrees, and to have five protrusions, five detention holes were arranged at an angle of 72 degrees. The diameter of the central hole was 0.18 mm, and the peripheral hole for forming the protrusion was 0.15 mm. In addition, the interval between the central detention hole and the peripheral detention space was arranged at intervals of 0.08 mm.

Examples 1-3 and Comparative Examples 1-6

Using a suitable spinneret Using a polyester polymer with an intrinsic viscosity of 0.64, 75 denier 36 filament yarns with four protrusions with spinning speed of 1300m / min, spinning temperature of 295 ℃, cold wind speed of 0.50m / sec, and discharge of 32.5g / min After the gentleman was prepared, it was drawn to draw ratio 3.0, preheating temperature 80 ℃, heat setting temperature 135 ℃, but changing the degree of release.

The result compared with the yarn of the other cross section was shown in Table 1.

Cross section Shape Hygroscopicity (mm / min) Friction band voltage (KV) Dyeability Comparative Example 1 5 30 2.3 ④ Example 1 20 40 2.2 ② Example 2 35 54 1.8 ② Example 3 50 60 1.5 ③ Comparative Example 2 60 63 1.3 ⑤ Comparative Example 3 ○ － 28 5.7 ① Comparative Example 4 △ － 29 6.0 ① Comparative Example 5 5 25 5.5 ② Comparative Example 6 － 33 2.0 ②

* The degree of release of the rectangular cross section yarn of Comparative Example 5 is the ratio of the length of the major axis and minor axis.

* Hygroscopicity measurement was measured according to JIS L 1096 6.26.1 (Method B).

(The moisture absorption rate of cotton fabric is 78mm / min)

* Friction band voltage was measured by KS K 0815 5.28.1 (Method B).

* Dye uniformity is the highest evaluation of dyeing uniformity by sensory evaluation after dyeing 100 yarns in disperse dyes.

Examples 4-6 and Comparative Examples 7-11

Using a suitable spinneret, a 75 denier 36 filament yarn with four protruding sections at a spinning speed of 1300 m / min, spinning temperature of 295 ° C, cold wind speed of 0.50 m / sec, and discharge of 32.5 g / min, using a polyester polymer with an intrinsic viscosity of 0.64 After the undrawn yarn is drawn, it is drawn at a draw ratio of 3.0, a preheating temperature of 80 ° C., and a heat setting temperature of 135 ° C., and the release degree is fixed at 35%, and the thickness ratio which is the ratio of the thickness of each protrusion and the thickness of each contact part is changed. It was prepared by.

The result was compared with the yarn of the other cross section, and the result was shown in Table 2.

Cross section Length ratio Hygroscopicity (mm / min) Emissivity Example 4 1.0 30 0.77 Example 5 1.2 40 0.73 Example 6 1.3 54 0.75 Comparative Example 7 1.4 60 2.50 Comparative Example 8 ○ - 28 0.60 Comparative Example 9 △ - 29 0.92 Comparative Example 10 5 25 1.10 Comparative Example 11 - 33 1.20

* The rate of yarn trimming is the percentage at which yarn is cut during manufacturing

Examples 7-9 and Comparative Example 12

Using a suitable spinneret, 75 denier 36-filament After the unstretched yarn was prepared, it was stretched to a draw ratio of 3.0, a preheating temperature of 80 ° C., and a heat setting temperature of 135 ° C., but the release degree was fixed at 35%, and was manufactured by changing the number of protrusions.

The results were compared with those of the other cross sections, and the results were shown in Table 3.

Number of protrusions Hygroscopicity (mm / min) Emissivity Example 7 Three 45 0.70 Example 8 Four 54 0.75 Example 9 5 60 2.10 Comparative Example 12 6 52 6.10

The present invention can be produced with excellent spinning workability using a spinneret which is a combination of a circular detent ball around the circular detent ball in the center of the semi-closed water transfer path is formed.

The release cross-section polyester yarn of the present invention is excellent in hygroscopicity because three to five semi-closed water transfer passages are formed between the spherical protrusions.

Claims (3)

Deformed cross-section polyester yarn, characterized in that three to five spherical protrusions protrude at equal intervals, the degree of release is 10 to 50%, the thickness ratio is 1.0 to 1.3. only, Melt-spun polyester polymer to produce a cross-section polyester yarn, melt spinning with spinnerets arranged with three to five circular holes at the same angular intervals around the central center hole Method for producing a cross-section polyester yarn, characterized in that. 3. The polymorphic cross-section of claim 2, wherein the diameter of the center hole is 0.18 mm, the diameter of the peripheral hole for forming the protrusions is 0.15 mm, and the distance between the center hole and the peripheral hole is 0.08 mm. Ester's manufacturing method.