KR100484119B1 - Manufacturing method of polyester microfilament yarn - Google Patents

Abstract

The present invention is a method for producing polyester microfilament yarn having excellent physical properties and process quality, which is melt spinning at a spinning speed of 3,500 m / min to 5,500 m / min, followed by cooling, reheating, and oiling to prepare Characterized in that the distance (J) from the detention to the first oil ring position to satisfy the following equation.

J (m) = (D × A × 1,000 / V) ± 0.3m

D; Single yarn fineness (denier)

A; An integer of 13 as the experimental constant

V; 3,500-5,500m / min

Description

Manufacturing method of polyester microfilament yarn

The present invention relates to a method of manufacturing a polyester microfilament yarn having a single yarn fineness of 1 denier or less and a single yarn number of 40 or more by a high-speed spinning method, and more specifically, reheating after cooling in melt spinning at a spinning speed of 3,500 m / min or more The present invention relates to a method for producing a polyester microfilament yarn having properties similar to those of the stretched yarn without introducing a separate stretching process.

Conventional polyester fibers have been produced by drawing and heat-treating unstretched yarn obtained by melt spinning at a spinning speed of 4,000 m / min or less, but recently, a technique capable of manufacturing polyester multifilament yarns using only one step method has been developed.

As described above, US Patent Nos. 2,604,667 and 2,957,747, which are improved methods of the prior art, have sufficient orientation and crystallinity without a separate stretching process by only a high-speed spinning process having a spinning speed of 4,750 m / min or more after melt spinning the polyester. A method for producing polyester fibers is proposed, and the inventors of the present invention in Korea Patent Application No. 95-26017 and Korean Patent Publication No. 93-13242 melt spinning the polyester to produce only a spinning process of more than 5,500m / min It has been proposed a method of manufacturing polyester fibers close to the gentleman's properties.

In addition, the spinning method to have a sufficient degree of orientation and crystallization only by melt spinning without a separate stretching process, for example, British Patent No. 903,427 in the heat treatment region 10 ~ 80 ℃ lower than the melting point of the polyester Then, the technique which wound up at the speed of 1,300-2,600m / min was proposed.

However, under the low spinning speed as described above, since the fibers with very high shrinkage rate and unstable physical properties are obtained, various quality problems are generated in the normal weaving and dyeing process.

In addition, in Japanese Patent Application Laid-Open No. 55-10684, a method of producing polyester yarn of the same physical properties as the stretched yarn without a separate stretching process by melt spinning and cooling the polyester after passing through a heating zone, the yarn is cooled to 140- The present invention provides a method for producing a polyester fiber that is heated to a temperature of 210 ° C., drawn at a speed of 2,000 to 4,500 m / min, and then heat treated at a temperature of 130 ° C. or higher while being stretched to 1 to 20% using a heating roller. Doing.

However, when the heating atmosphere temperature is lower than 150 ° C in the area under the pulling speed of 3,500m / min, there is a problem in that the fibers are somewhat unstable in physical properties, and the pulling speed does not exceed 4,500m / min, which is uneconomical in terms of productivity. .

In addition, the inventors of the Republic of Korea Patent Application No. 95-46759 has proposed a method that can solve the problems described above, but this method is not enough to ensure the operational stability enough to generate a lot of trimming in less than 1 denier single yarn fineness. .

In addition, the microfilament yarn is cooled to below the solidification temperature in the cooling zone after the spinning nozzle, and then heated to a temperature exceeding the solidification temperature in the heating zone, and then simultaneously blown while blowing to the gas medium to increase the frictional resistance. Korean Patent Publication No. 95-1648, which is a method for generating the required tensile force, proposes a method of passing a gaseous zone in a reverse flow through a heating zone in an unbundled arrangement of microfilaments having a single yarn fineness of less than 1.0 denier. However, this method has a problem that the trimming rate is increased by causing a very high radiation tension because the heat treatment is performed in a state in which the thread is not connected to the material expression side.

The present invention solves the problems of the prior art as described above, a method for producing a polyester microfilament having a single yarn fineness of less than 1 denier and a single yarn number of 40 or more without undergoing a separate stretching process at a spinning speed of 3,500 m / min or more The purpose of the present invention is to provide a manufacturing method capable of manufacturing the yarn having properties comparable to that of the stretched yarn with good operability.

Hereinafter, the present invention will be described in detail.

The present invention melt-spun polyester microfilament yarn having a single yarn fineness of 0.4 to 1.0 denier and a single yarn number of 40 to 150 at a spinning speed of 3,500 m / min to 5,500 m / min, and the bottom of the spin pack except for spinnerets is 250 to 350 To a solidification temperature (below 80 DEG C) of the polyester yarn from 20 to 60 mm directly below the spinneret, and then heated to a temperature of 100 DEG C or more exceeding the solidification temperature of the polyester yarn in the heating zone to be sufficiently stretched. In the process, polyester microfilament is produced by setting the length and position of the heating zone portion such that the distance (J) from the spinneret to the position where the emulsion is first given is included in the distance satisfying the following formula (I). It relates to a manufacturing method of the company.

Below

Ｊ (m) = (D × A × 1,000 / V) ± 0.3m

D; Single yarn fineness (denier)

A; An integer of 13 as the experimental constant

V; 3,500-5,500m / min

(The first oil ring position is at a distance of 0.1 to 0.5m directly below the heating zone part.)

According to the present invention, as the single yarn fineness decreases or the spinning speed increases, the position of the oil ring guide should be moved closer to the spinneret as the single yarn fineness decreases. Can be prepared. In addition, the present invention can be produced polyester microfilament fibers having excellent physical properties and dimensional stability only when the spinning speed is more than 3,500m / min. In the present invention, the position of the oil ring guide set according to the spinning conditions, that is, spinning speed, polymerization viscosity, single yarn fineness, and spinneret characteristics is somewhat affected. The position of the ring guide should be set within 0.1 to 0.5m directly below the lower end of the heating area, and the heating area should be installed as close to the spinneret as possible than when producing polyester filaments with 2 ~ 3 denier of ordinary single yarn fineness. The length of the heating zone should also be such that only the minimum effective heating field is maintained.

In other words, as the single yarn fineness decreases, the stress applied to the microfilament increases rapidly according to the spinning speed, and as a result, the trimming and the process quality deteriorate, so that the oil ring position is set according to the above formula (I). In consideration of all the conditions, it was set in the range of ± 0.3m.

In the present invention, the distance from the spinneret to the oiling position is kept as short as possible in the manufacturing process of the polyester microfilament, so as to maintain only the minimum radial tension required for the physical expression. Therefore, it is characteristic to change the distance appropriately.

In the present invention, in spite of the high-speed spinning of the microfilament, the emulsification is carried out in the winding chamber, not in the spinning chamber. When oiling is performed before the heating zone as in the prior art, the heat transfer effect is insufficient to cause physical property instability of the polyester fiber as well as to cause dyeing defects due to oil ring nonuniformity. In addition, in the present invention, since the radial tension of the single yarn fineness is higher than that of the fabric of 2 to 3 deniers, and the cutting speed is sharply increased, the oil ring guide is installed in the lower portion of the heating zone. By setting the position and position of the oil ring guide at least short, all problems such as radiation tension and process quality could be solved.

In addition, in the present invention, by air entanglement with an air entanglement device installed directly under the oil ring guide, cooling of the heated fiber, diffusion and concentration of the emulsion, and the quality of the yarn can be improved.

The polyester microfilament fibers produced by the present invention have a strength of 4.0 g / denier or more and a 10% strength of 2.0 g / denier or more, thus satisfying the required physical properties as the stretched yarn and having good dimensional stability, and the present invention has excellent processability.

Examples 1-2

Using a polyester polymer of intrinsic viscosity (IV) 0.63, the spinning temperature was 295 ° C, the heating temperature at the bottom of the spin pack was 290 ° C, and the spinneret diameter was 0.18mm (72 holes). Was discharged at a spinning speed of 4,500 m / min (Example 1). Furthermore, the spinneret diameter was 0.18 mm (48 holes), and the discharge amount was adjusted so that the final yarn had a fineness of 50 denier, and melt spun at a spinning speed of 5,000 m / min (Example 2). In the heating zone, the oiling guide was installed at the heating zone (1.2m) from the point of 1.2m from the spinneret (directly to the cooling section) to the heating zone (1.2m) and 0.3m below the heating zone. Prepared by setting. Other spinning conditions were prepared polyester microfilament yarn in the same manner as in Example 3, the physical properties and processability were evaluated and the results are shown in Table 1.

Example 3

Using a polyether polymer of intrinsic viscosity (IV) 0.63, the spinning temperature was 298 ° C, the heating temperature at the bottom of the spin pack was 300 ° C, and the spinneret diameter was 0.15mm (96 holes). The discharge amount was adjusted so that the fineness was 50 denier, and was melt spun at a spinning speed of 4,000 m / min. The cold air was adjusted to 0.35m / sec, and the heating zone was installed at the heating zone (1.2m) from the point of 0.7m from the spinneret (just below the cooling section) to the heating zone (1.2m) and 0.3m below the heating zone. It was prepared by setting the temperature of the heating zone to 150 ℃. The tanning amount (O.P.U) was 0.85%.

An air entanglement device was installed between the oil ring guide and the take-out roller to air entangle the air with a pressure of 0.5 kg / cm 2.

Yarn physical properties and processability of the prepared polyester microfilament yarn were evaluated and the results are shown in Table 1.

TABLE 1

※ Property measurement method

(1) 10% strength

An instron elongation curve was plotted and the strength at elongation 10% divided by denier was expressed as intensity.

(2) shrinkage

After the sample was treated with 100 ° C of water for 30 minutes, a superload of 0.1 g / denier was applied to measure the length of the fibers before and after shrinkage and calculated in terms of percentage.

(3) Evaluation of fairness

○: very good, △: good, ×: poor

Comparative Example 1

A polyester microfilament yarn was manufactured in the same manner as in Example 3, except that the heating zone (the length of the heating zone) was 1.2m from the point 1.3m away from the spinneret (directly below the cooling section) to the heating zone. The oil ring guide was installed at a position of 0.3m directly below (the position of the oiling guide was placed at a position 2.8m from the spinneret), and the physical properties and fairness thereof were evaluated and shown in Table 2.

Comparative Example 2

Polyester microfilament yarn was prepared in the same manner as in Example 2, but the melt was spun at a spinning speed of 3,000 m / min by adjusting the discharge amount so that the fineness of the final yarn was 50 denier. The position of the oil ring guide is manufactured by adjusting the heating area to be 3.5m from the spinneret, and the physical properties and processability thereof are shown in Table 2 below.

Comparative Examples 3 to 4

Polyester microfilament yarns were prepared in the same manner as in Example 2, but the oil ring guides were installed so as to be 3.5m and 1.5m from the spinneret, respectively, and the physical properties and fairness thereof were evaluated and shown in Table 2.

TABLE 2

Comparative Example 5

Using a polyester polymer of intrinsic viscosity (IV) 0.63, the spinning temperature was 292 ° C, the spinneret diameter was 0.20 mm (48 holes), and the discharge amount was adjusted so that the final yarn had 100 denier at a spinning speed of 5,000 m / min. It was adjusted to melt spinning. Cooling wind was adjusted to 0.45m / second, the position of the oil ring guide was installed at a point 3.2m from the spinneret, the length of the heating zone portion was set to 1.5m, the temperature of the heating zone was set to 150 ℃, oil ring An air entanglement device was installed between the guide and the take-off roller to allow air entanglement. Emulsion adhesion amount (O.P.U) was to be 0.85%, the pressure of the interlocking device was prepared at 0.7kg / ㎠. The physical properties and processability of the prepared polyester microfilament yarn were evaluated and the results are shown in Table 3.

TABLE 3

The present invention, in the production of polyester microfilament yarn having a single yarn fineness of 1.0 denier or less by a high-speed spinning method of more than 3,500m / min without a separate stretching process, the distance from the spinneret to the oil ring position where the oil is first given, spinning conditions, In particular, the distance calculated by the two conditions of single yarn fineness and spinning speed should be as close as possible to the spinneret, so that the polyester microfilament yarn having excellent physical properties with minimal spinning tension can be manufactured with good operability.

Claims (2)

Manufactured by melt spinning a polyester microfilament yarn having a single yarn fineness of 0.4 to 1.0 denier and a single yarn number of 40 to 150 at a spinning speed of 3,500 m / min to 5,500 m / min, cooling sequentially, reheating in an heating zone, and oiling The method of manufacturing polyester microfilament yarns according to claim 1, wherein the distance J from the spinneret to the oil ring position to which the oil is first applied is satisfied so as to satisfy the following formula (I). Below J (m) = (D x A x 1,000 / V) ± 0.3 m. … (I) In formula (I) D; Single yarn fineness (denier) A; An integer of 13 as the experimental constant V; 3,500-5,500 m / min (The first oil ring position is at a distance of 0.1 to 0.5m directly below the heating area.) The method of manufacturing polyester microfilament yarns according to claim 1, characterized in that an air entanglement treatment is performed after oiling.