KR20060078741A - A process for preparing polyester multifilamant for yarn diving having injection - Google Patents

Abstract

The present invention relates to a polyester divided yarn having improved spraying process by improving the spinning process. More particularly, the present invention relates to a polyester divided yarn having a single yarn fineness of about 20 to 50 denier, and a method for producing the same, by melt spinning the polymer to improve spraying workability by 5 to 10%. That is, the object of the present invention is to manufacture a polyester powdered yarn having improved spraying workability through an optimal emulsion condition and an emulsion imparting method.

The polyester divided yarn manufactured by the present invention has more uniform filament properties than the general polyester divided yarn, and shows superior sprayability than the general polyester divided yarn.

Polyester, fiber thread, monofilament, emulsion

Description

A process for preparing polyester multifilamant for yarn diving having injection}

The present invention controls the thermal stability and emulsion uniformity, cooling uniformity, physical properties and the like, in the melt spinning the polyester powdered yarn having a single yarn fineness of 20 to 50D and a single yarn number of 5 to 30, an emulsion applying method and an emulsion friction coefficient, etc. By controlling the denier between the filament (pillar), and the physical properties of the divided yarn for excellent spraying work by reducing the deviation, and a method for manufacturing the same.

In general, polyester monofilaments having a fineness of about 20 to 40D are thin and require great care to obtain uniform cooling and solidification during spinning. In order to solve this process problem, the proposed method is the branch thread. In the spinning yarn method, a yarn having 10 to 12 strands of fiber is manufactured in a spinning process, and then separated into a single strand (monofilament) through a splitting process. Such divided yarns not only improve productivity, but also have the advantage of uniformly imparting a function required for monofilament.                         

Participating yarns are mainly used for the purpose of automatic spraying, beam spraying, and combusting spraying. First of all, in case of simulation, flammability can be measured by spraying and flammability, and in case of mono, it can be evaluated according to the variation of physical properties between pillars and U%, CV%, and the expression level of assigned functionality. . Among the various evaluation factors, the present invention relates to a method of improving the spraying workability of the simulation through the control of the emulsion.

Recently, in the polyester fiber industry, interest in branched yarns has been increased in terms of development of productivity and improved productivity of differentiated materials having high added value. For manufacturing methods of such branched yarns, Korean Patent Publication Nos. 94-4691 and 87 -869 and Korea Patent Publication No. 1999-30033, etc., but There is nothing specifically mentioned about spraying workability which is the most basic item. In addition, the method for increasing the spray workability is hardly dealt with. Injection workability not only directly affects productivity, but also serves as an indicator of the physical properties of the simulation. Factors that determine the spraying workability of polyester powder spun yarn include pillar-denier and physical property deviation, inter-spherical friction coefficient and sea-going force, degree of concentration, and oil adhesion, and these factors are closely related to the characteristics of the oil and the method of imparting emulsion. Are affected.

Accordingly, an object of the present invention is to produce a polyester powdered yarn having a spraying workability of 5 to 10% and having a single yarn fineness of 20-50 deniers.

That is, the object of the present invention is to improve the uniformity between the monofilament through the improvement of the emulsion, and to adjust the coefficient of friction aims at the production of polyester powder spun yarn improved spraying.

The present invention is described in more detail as follows.

In the present invention, by analyzing the factors that determine the injection workability and improve them one by one to establish the optimum conditions to produce a branched yarn.

In the case of the emulsion used in the present invention, as a result of testing using different emulsions having different fiber to fiber friction (F / F) and fiber to metal friction (F / M), This could confirm the condition of the most excellent emulsion. The friction coefficient of the emulsion has a direct influence on the F / F and F / M friction coefficients of the simulation. In general, the F / F friction coefficient affects tension unevenness and trimming, and the F / M friction coefficient affects spraying and burning. In addition, the emulsion has an effect on the sea-floor force. Poor sea-floor force may cause tension unevenness during spraying, and may also have a great influence on the twisting direction and the crimping rate during the burning operation. It is important to apply the emulsion with it. The test results showed the highest injection workability when using an emulsion having an F / M dynamic friction coefficient of 0.20 to 0.25, an F / F static friction coefficient of 0.25 to 0.30, and a volatilization loss of 10% to 15%.                     

If the static friction F / F exceeds 0.30, tension unevenness and trimming occur during injection. If the dynamic friction F / M is less than 0.20, the injection point is lowered by preventing slippage with the guide during injection. The result appeared. In addition, when the volatilization amount is more than 15%, non-uniformity of the fluid adhesion amount (OPU) occurs and the injection workability is deteriorated. On the other hand, it was confirmed that OPU uniformity and spraying workability were improved when a functional agent for decreasing viscosity was added to the oil agent.

Even if the oil pick-up (OPU) is constant, the oil may be adsorbed unevenly around the yarn. Therefore, in order to increase the oil adsorption uniformity, additional methods of attaching the oil in addition to the existing oiling are required. It became. To this end, spraying performance could be improved by installing an additional two-stage oiling between the existing one-stage oiling position and the winding machine (W / D). This resulted in a decrease in OPU variation between mono yarns and uniform absorption of the oil. In general, roller oiling (R.O.) and jet oiling (J.O.) show the following differences. In terms of uniform adhesion, the R.O. is excellent and the OPU% deviation is less J.O. Considering these characteristics, the test was conducted by combining two types of oiling. The test results of three combinations are as follows. J.O. and R.O. The sprayability in combination was the best.

▲ J.O. and R.O. two-stage oiling

▲ Two-stage oiling of R.O. and J.O

▲ Two-stage oiling of R.O. and R.O.                     

Hereinafter, the present invention will be described in detail with reference to the embodiments of the present invention, which is for illustrative purposes only and should not be construed as limiting the present invention.

Examples and comparative examples of the present invention are as follows.

Example 1

Using a polyethylene terephthalate polymer having a titanium dioxide (TiO ₂ ) content of 3000 ppm having a relative viscosity (RV) of about 0.680 to 0.750, spinning was performed at a spinning temperature of 290 ° C., a hot zone of 80 mm, and a cold wind speed of 0.8 m / s. F / M dynamic friction coefficient of 0.24, F / F static friction coefficient of 0.28, volatilization loss of 15% oil was used, and oiling was carried out in the order of JO and RO oiling, followed by spraying after melt spinning to show the results. 1 is shown.

[Comparative Example 1]

The same conditions as in Example 1 were used except that an F / M dynamic friction coefficient of 0.25 and an F / F static friction coefficient of 0.40 were used. The results are shown in Table 1.

[Comparative Example 2]

The same conditions as in Example 1 were used except that an emulsion having an F / M dynamic friction coefficient of 0.10 and an F / F static friction coefficient of 0.25 was used, and the results are shown in Table 1.

[Comparative Example 3]

Except having used an emulsion having a volatilization loss of 25% was tested under the same conditions as in Example 1, the results are shown in Table 1.

[Comparative Example 4]

The test was conducted under the same conditions as in Example 1 except that the roller oil ring was additionally installed in the roller oil ring, and the results are shown in Table 1.

[Comparative Example 5]

The test was conducted under the same conditions as in Example 1 except that the spray oil ring was additionally installed in the roller oil ring, and the results are shown in Table 1.

Example 2

Using a polyethylene terephthalate polymer having a TiO2 content of 3000 ppm with a relative viscosity (RV) of about 0.680 to 0.750, spinning was performed under conditions of a spinning temperature of 290 ° C, a hot zone of 80 mm and a cold wind speed of 0.8 m / s. Oil friction with a coefficient of kinetic friction of 0.20, a coefficient of static friction of 0.25, and a volatilization loss of 10% was used. Oiling was carried out in the order of JO and RO oiling, followed by melt spinning, and the spraying was performed. The results are shown in Table 1.

Island Strength (g / den) 10% (g / den) Elongation (%) U% OPU deviation Radiation workability Spray workability (%) Example 1 20.5 / 0.09 5.10 / 0.10 3.82 / 0.05 27.1 / 0.35 0.98 0.05 ◎ 99 Example 2 20.1 / 0.10 5.32 / 0.10 3.75 / 0.07 26.4 / 0.39 1.04 0.04 ◎ 99 Comparative Example 1 20.2 / 0.20 5.05 / 0.26 3.77 / 0.09 27.5 / 0.50 1.17 0.07 ◎ 93 Comparative Example 2 19.5 / 0.11 5.22 / 0.12 3.81 / 0.08 26.9 / 0.41 1.02 0.08 ◎ 92 Comparative Example 3 20.3 / 0.11 5.31 / 0.13 3.78 / 0.08 27.1 / 0.50 1.30 0.28 ◎ 92 Comparative Example 4 20.2 / 0.10 5.11 / 0.11 3.80 / 0.07 26.8 / 0.50 1.85 0.31 △ 91 Comparative Example 5 20.2 / 0.12 5.25 / 0.21 3.80 / 0.11 27.9 / 0.52 1.67 0.22 △ 93

※ Displayed as average / standard deviation between mono pillars after spraying                     

<Property measurement method>

1) Evaluation of radio workability (no-running rate / day)

No mortality rate exceeded 95% / day ⇒ Radio workability ◎

No trimming rate 70 to 95% / day ⇒ Radio workability △△

No mortality rate less than 70% / day ⇒ Radiation workability ×

Not work ⇒ No radiation × ×

2) Strength (g / den): strength of broken new town ÷ yarn denier

3) Injection workability evaluation method

-The evaluation of spraying workability indicates the number of yarns that are completed without spraying when 100 pieces are working.

Ex) When spraying 100 woolen yarns, 90 of them are sprayed without cutting → 90% spraying workability

In the present invention, melt spinning of a polyester powdered yarn having a single yarn fineness of 20 to 50D and a single yarn number of 5 to 30 is optimized between emulsions and emulsion applying methods under specific conditions, thereby controlling friction coefficient and sea-flouring force. By improving the uniformity, it is possible to improve the dispersion simulation with excellent spraying workability.

Claims (3)

In the method for producing a polyester powdered yarn having a single yarn fineness of 20 to 50 denier and a single yarn number of 5 to 30, the coefficient of kinetic friction between fiber metals is 0.20 to 0.25 and the coefficient of static friction between fibers (F / F) is 0.25 as a spinning oil. To 0.30, a volatilization loss of 10% to 15% by using an emulsion, the sugar oil is subjected to a jet oiling (Jet Oiling), and then roller oiling (Roller Oiling) to give an emulsion Process for producing polyester powdered yarn. A polyester divided yarn manufactured by the method of claim 1. In the monofilament produced by dividing the divided yarn of claim 2, the following formulas 1) to 4) are satisfied, The polyester monofilament. 1) Strength deviation between monofilaments after spraying ≤0.10 2) Elongation deviation between monofilaments after spraying ≤0.40 3) OPU deviation between monofilaments after spraying ≤0.05 4) Uniformity (U%) ≤1.2