KR100231192B1 - A process for manufacturing polyester fiber - Google Patents

Abstract

The present invention is treated with a solution of plasticizer / solvent before stretching the polyester unstretched yarn, then heat treated and relaxedly stretched in the process of fertility stretching, so that the tensile strength suitable for the properties of embroidery 2.0-4.0 g / d, elongation at break 15-25% , Which is a method of manufacturing embroidery thread having a heat shrinkage of 2% or less.

The present invention is prepared by treatment within 45 seconds using a phenylphenyl / methylene chloride solution containing 0.5 ~ 5.0% by weight of biphenyl as a plasticizer, and multi-stretched under conditions of heat treatment temperature 200 ~ 230 ℃, relaxation elongation 0.92 ~ 0.97 It's a feature.

Description

Manufacturing method of polyester fiber for embroidery

The present invention relates to a method of manufacturing a polyester filament for embroidery, and more specifically, to a polyester filament before the stretching with a plasticizer / solvent to perform a multi-stage stretching to lower the tensile strength, elongation at break and heat shrinkage at the same time The present invention relates to a method for producing a polyester fiber having suitable physical properties.

In general, embroidery yarns have been mainly used for rayon fibers with good dyeability and excellent embroidery process.

However, rayon fiber is a pollution-causing industry, and its production facilities are gradually being reduced. Also, it is gradually being replaced by polyester fiber due to problems such as causing skin diseases in the post-heating process.

To be used as embroidery yarns, polyester fibers must have a tensile strength of 2.0 to 4.0 g / d, an elongation at break of 15 to 25%, and a heat shrinkage of 2% or less. If the tensile strength is less than 2.0g / d, trimming is likely to occur in intermediate processes such as twisting, and if the tensile strength exceeds 4.0g / d, the cutting process after embroidery is poor and the appearance is poor.

If the elongation at break is less than 15%, the workability in the intermediate process is poor. If the elongation at break is more than 25%, the embroidery surface is not smooth due to the phenomenon of puckering after embroidery. In addition, if the heat shrinkage exceeds 2%, uneven salts are caused during dyeing with cheese, and the four layers of cheese are collapsed due to uneven shrinking, and shrinkage occurs in the heat setting process even after embroidery. This becomes poor. However, conventional polyester filament has a tensile strength of about 5.0g / d, elongation at break of 30%, heat shrinkage of 8% was not suitable for embroidery use.

In addition, since the tensile strength and the elongation at break are inversely proportional factors, to lower the tensile strength and the elongation at break simultaneously, a high temperature heat treatment must be performed during the spinning or drawing process. However, in this case, the yarns that are subjected to excessive energy are placed in the outer layer on the cross-section, and when the yarns are heat-set, pre-treated and dyed after the yarns, the oligomers are migrated, resulting in poor dyeing and poor degradability. Will cause problems.

Korean Patent Publication No. 96-11606 is a prior art attempting to solve these problems.

This method is a copolymerization method for producing polyester fibers having physical properties suitable for embroidery yarns by adding DMS (dimethyl sulfonate) and dimethyl adipate during polymerization, and polymerizing and preparing them and heat-treating them through four-stage drawing in the drawing step. There is a disadvantage in that the manufacturing cost is increased due to the use of water and the daylight fastness is lowered.

In addition, Korean Patent Publication 94-11310 tries to adjust the strength and elongation of polyester fiber appropriately through solvent treatment before and after stretching, but it is made of batch type for undrawn or wound yarn wound with solvent treatment. Variation in physical properties due to solvent treatment variation between the inner and outer layers of the wound yarn is likely to occur, and the heat shrinkage rate cannot be adjusted to less than 2%.

It is an object of the present invention to provide a method for producing a polyester fiber having physical properties suitable for embroidery by treating a yarn in a running state before stretching after spinning with a solution of a plasticizer / solvent, and washing with water and drying in multiple stages.

Hereinafter, the present invention will be described in detail.

The present invention provides a plasticizer for polyester undrawn yarn before stretching after spinning to produce polyester fibers having a tensile strength of 2.0 to 4.0 g / d, a breaking strength of 15 to 25%, and a heat shrinkage of 2% or less so as to be suitable for use in embroidery yarns. / Is treated with a solution of the solvent.

In the present invention, biphenyl / methylene chloride was used as the plasticizer / solvent.

Biphenyl is known as a plasticizer to increase the degree of crystallinity by plasticizing polyester, and methylene chloride, a solvent, dissolves biphenyl easily and simultaneously swells the polyester so that the plasticizer can penetrate into the fiber. Although the biphenyl concentration in methylene chloride liquid requires some adjustment according to the firing speed, 0.5 to 5.0% by weight is preferable.

If the biphenyl concentration is less than 0.5%, the crystallization does not cause the expected level. If the biphenyl concentration exceeds 5.0% by weight, the physical properties of the fiber itself are severe, making it difficult to use.

In addition, the processing time of the plasticizer / solvent should be 5 to 45 seconds. If the treatment time is less than 5 seconds, the crystallization of the yarn cannot be obtained due to failure of the expected level of crystallization. If the treatment time exceeds 45 seconds, excessive crystallization occurs and fusion occurs between the filaments.

The plasticization treatment adjusted the dwell time in the firing speed and treatment tank so that it could be treated by immersion or spraying for a predetermined time.

The plasticizer treated under the above conditions is washed with water at room temperature continuously, dried by heating, and wound up. The polyester unstretched yarn thus obtained is four-stage stretched to lower the heat shrinkage ratio, but the relaxation stretch ratio is 0.92-0.97, and the heat treatment temperature is 200-230 ° C. If the stretching ratio is less than 0.92, the stretching yarn is poor due to excessive relaxation, leading to roller detachment or nonuniformity of the yarn. If the stretching ratio is more than 0.97, the heat shrinkage ratio exceeds 2%. In addition, when the heat treatment temperature is less than 200 ℃, the heat shrinkage rate of the yarn exceeds 2%, causing problems such as uneven salt and sand layer unevenness in the four-shot process, which is a process of making embroidery yarn, and if the temperature exceeds 230 ℃, the yarn is subjected to excessive heat treatment There is a problem of hardening or fusion.

Tensile strength and elongation at break in the present invention was measured by a conventional tensile strength tester, heat shrinkage was evaluated according to the method of JIS L1073, it was measured using the reel shrinkage method.

Example 1

Methylene chloride of 1% by weight of biphenyl was wound while the polyester resin prepared by polymerization in a conventional manner was wound at a spinning temperature of 300 ° C. and a winding speed of 1,265 m / min through a 48-hole Y-type nozzle in a screw-extruded spinning machine. The solution was treated with a solution for 40 seconds, washed with water for 2 minutes, and then dried at 120 ° C. in a dry heater to obtain undrawn yarn of 365 denier / 48 filaments.

The unstretched yarn is drawn in a four-stage drawing machine at a drawing speed of 1,200 m / min, primary draw ratio 1.015, secondary draw magnification 1.6, third draw magnification 1.2, relaxation draw magnification 0.955, and heat treatment temperature of 220 ° C to 118 denier / 48 filaments I got a drawing company. The physical properties of the drawn yarn thus obtained were measured and shown in Table 1.

Example 2

The content of biphenyl was 4 wt% and the treatment time was 15 seconds, except that the treatment was the same as in Example 1, and the results are shown in Table 1.

Example 3

Undrawn yarn was prepared in the same manner as in Example 1 except that the relaxed draw ratio was 0.930 and the heat treatment temperature was 230 ° C. in the four step drawing process, and the results are shown in Table 1.

Example 4

Except that the heat treatment temperature was 210 ℃ in the four-stage stretching process was the same as in Example 1, the results are shown in Table 1.

Comparative Example 1

Except that the biphenyl content of 0.4% by weight was the same as in Example 1, the results are shown in Table 1.

Comparative Example 2

Except that the biphenyl content of 7% by weight was the same as in Example 1, the results are shown in Table 1.

Comparative Example 3

Except for treating the biphenyl / methylene chloride solution in the yarn for 50 seconds was the same as in Example 1, the results are shown in Table 1.

[Comparative Example 4]

Except that the heat treatment at 240 ℃ to reduce the heat shrinkage was the same as in Example 1, the results are shown in Table 1.

[Comparative Example 5]

Except that the heat treatment at 190 ℃ to reduce the heat shrinkage was the same as in Example 1, the results are shown in Table 1.

Comparative Example 6

Except for treating the relaxed stretching ratio to 0.900 in order to lower the heat shrinkage rate was the same as in Example 1, the results are shown in Table 1.

Comparative Example 7

Except for treating the relaxed stretching ratio to 0.990 in order to lower the heat shrinkage rate was the same as in Example 1, the results are shown in Table 1.

Polyester fiber of the present invention prepared as described above has a tensile strength of 2.0g / d ~ 4.0g / d, elongation at break is 15-25%, heat shrinkage is 2% or less can replace the existing rayon embroidery yarn Excellent physical properties were shown.

Claims (1)

The polyester unstretched yarn was treated with a solution of biphenyl / methylene chloride having a biphenyl content of 0.5 to 5.0 wt% for 5 seconds to 45 seconds, and then subjected to a heat treatment temperature of 200 to 230 DEG C and a relaxation stretch ratio of 0.92 to 0.97 in the multistage stretching process. Method for producing a polyester fiber for use in embroidery, characterized by stretching under conditions.