JP2005240208A - Polyester combined filament yarn having small fineness and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a polyester combined filament yarn having excellent appearance in spite of having high strength even in small fineness. <P>SOLUTION: The spun combined filament yarn comprises a polyester filament A having 0.75-1.00 intrinsic viscosity, 1.5-2.4 cN/dtex stress at 5% elongation, 6-15% shrinkage percentage in boiling water and 1.0-5.0 dtex single filament fineness and a polyester filament B having 0.5-0.65 intrinsic viscosity, ≤1.0 cN/dtex stress at 5% elongation, ≤6% shrinkage percentage in boiling water and 1.0-5.0 dtex single filament fineness. The polyester combined filament yarn has 5-30 wt.% ratio of the polyester filament B. The combined filament yarn has 30-100 dtex total fineness, 4.5-7.0 cN/dtex strength and 3-10 /m number of interlacings. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fine polyester blended yarn that exhibits excellent texture while having high strength even when the fineness is 100 dtex or less and a method for producing the same.

  Conventionally, a wide variety of polyester blend yarns have been proposed and used in various applications. On the other hand, high-strength yarns are used in sports fabrics and other applications from the standpoint of improving tear strength, and a method of increasing the silk factor of the yarn by increasing the intrinsic viscosity of polyester is generally used (patented) Reference 1).

  From these findings, high-strength yarns using high-strength yarns with high intrinsic viscosity are mainly high-strength and loops if they are mixed yarns where yarns with different physical properties occupy the core part and the sheath part has different physical properties. It is easily expected that performance such as bulkiness can be expected. However, the strength of these mixed yarns is mainly determined by the physical properties of the core yarn, so there is not only the problem that the strength per fineness of the mixed yarn decreases by mixing the sheath yarn, but also for thin fabrics. When used as a thread, there is a problem that the yarn is not fine enough.

  In order to improve such a problem, it is necessary to reduce the ratio of the thread | yarn distribute | arranged to a sheath part, For that purpose, it is necessary to make the thread | yarn used for a sheath thread | yarn thin. However, for example, a thin thread of 30 dtex or less is difficult to stably produce because thread breakage due to abrasion is likely to occur frequently.

  As a method for solving such a problem, for example, as proposed in Patent Document 2, a component that becomes a core yarn and a component that becomes a sheath yarn are simultaneously spun from the same or different spinneret, and this is mixed. There is a method of performing post-processing such as stretching after the entanglement treatment. However, according to the study by the present inventors, when a polyester having a high intrinsic viscosity is used as one component, it is necessary to increase the spinning temperature in relation to the melt viscosity, and as a result, the other polyester is deteriorated. There is a problem that it becomes large and cannot be stably spun.

JP-A-6-158472 Japanese Patent Laid-Open No. 11-140737

  The present invention has been made in view of the above-described background art, and an object of the present invention is to provide a polyester mixed yarn that exhibits an excellent appearance while having high strength even if it has a fineness.

  According to the study by the present inventors, the above-mentioned problem is as follows: “Intrinsic viscosity is 0.75 to 1.00, stress at 5% elongation is 1.5 to 2.4 cN / dtex, boiling water shrinkage is 6 to 15 %, Polyester filament A having a single yarn fineness of 1.0 to 5.0 dtex, intrinsic viscosity of 0.5 to 0.65, stress at 5% elongation of 1.0 cN / dtex or less, boiling water shrinkage of 6 % Or less, a spun mixed yarn composed of a polyester filament B having a single yarn fineness of 1.0 to 5.0 dtex, wherein the ratio based on the total weight of the blended yarn of the polyester filament B is 5 to 5%. 30% by weight, the total fineness of the blended yarn is 30 to 100 dtex, the strength is 4.5 to 7.0 cN / dtex, and the number of entanglements is 3 to 10 / m 2 It was found that it can be achieved by “fiber yarn.” .

  Further, such a polyester blended yarn is described as follows: “Polyesters having different intrinsic viscosities are melted and discharged from different spinnerets in the same spin pack, and the discharged yarns are converged after cooling and solidification to be mixed and entangled. In the manufacturing method in which the polyester is fed as an undrawn yarn after the treatment and then drawn and heat-treated, the temperature of the polyester fed into the spin pack is higher by 5 ° C. or more than the polyester having the higher intrinsic viscosity than the polyester having the lower intrinsic viscosity. It has been found that it can be produced by a method for producing a polyester fine fiber yarn having a fineness characterized in that it is characterized by:

  The fineness polyester blended yarn of the present invention has a high intrinsic viscosity, high strength and high elasticity, high shrinkage yarn and low elasticity, low elasticity, low shrinkage yarn, which are mixed at the spinning stage. Even if the ratio of the shrinking component is reduced, an excellent appearance can be obtained, and both strength and appearance can be achieved.

  The polyester in the present invention is mainly a polyester whose main repeating unit is ethylene terephthalate, and other components are 15 mol% or less, preferably 10 mol% or less, particularly preferably 5 mol% or less based on the total acid components. It may be copolymerized in proportion. Preferred copolymerization components include isophthalic acid, phthalic acid, adipic acid, sebacic acid, 5-sodium sulfoisophthalic acid, tetramethylene glycol, trimethylene glycol, diethylene glycol, neopentyl glycol, bisphenol A, 2,2-bis (4-hydroxyethoxyphenyl) propane and the like.

  The filament A as one component constituting the polyester mixed yarn of the present invention has an intrinsic viscosity of 0.75 to 1.00, a stress at 5% elongation of 1.5 to 2.4 cN / dtex, and boiling water shrinkage. It is necessary that the rate is 6 to 15% and the single yarn fineness is 1.0 to 5.0 dtex.

  The intrinsic viscosity of the filament A needs to be in the above range in order to obtain sufficient strength and breaking resistance (silk factor) for the mixed yarn. In addition, when this value is less than 0.75, since the difference with the filament B mentioned later which is the other component becomes too small, and bulkiness becomes difficult to express, it is not preferable. On the other hand, when it exceeds 1.00, it becomes very difficult to produce such a filament, and it becomes difficult to produce commercially. A more preferable range of intrinsic viscosity is 0.90 to 1.00.

  Further, when the stress at 5% elongation is less than 1.5 cN / dtex or the boiling water shrinkage rate is less than 6%, the difference in physical properties from the filament B described later becomes too small, and the bulkiness is hardly exhibited. . Conversely, when the stress at 5% elongation exceeds 2.4 cN / dtex, it becomes very difficult to produce such a filament, and when the boiling water shrinkage rate exceeds 15%, the shrinkage is too large. For this reason, the texture is lowered, which is not preferable.

  Next, when the single yarn fineness is less than 1.0 dtex, it is not preferable because yarn breakage frequently occurs at the time of yarn production. On the contrary, when it exceeds 5.0 dtex, the texture becomes coarse and hard.

  Next, the other component filament B constituting the polyester mixed yarn of the present invention has an intrinsic viscosity of 0.50 to 0.65, a stress at 5% elongation of 1.0 cN / dtex or less, and a boiling water shrinkage. Must be 6% or less, and the single yarn fineness should be 1.0 to 5.0 dtex.

  When the intrinsic viscosity of the filament B is less than 0.5, the viscosity of the melt at the time of spinning is too low, and it becomes difficult to spin stably. On the other hand, when it exceeds 0.65, the difference from the filament A becomes small, and the bulkiness is hardly exhibited.

  Also, when the stress at 5% elongation exceeds 1.0 cN / dtex or the boiling water shrinkage rate exceeds 6%, the difference from the tactic filament A becomes too small, so that the bulkiness is hardly exhibited. Become. Furthermore, when the single yarn fineness is less than 1.0 dtex, yarn breakage frequently occurs during yarn production, and conversely, when it exceeds 5.0 dtex, the texture becomes coarse, which is not preferable.

  The mixed yarn of the present invention comprising the filament A and the filament B has a total fineness of 30 to 100 dtex, preferably 50 to 90 dtex, and is based on the total weight of the mixed yarn of the filament B. The proportion should be in the range of 5-30% by weight, preferably 10-25% by weight, particularly preferably 15-20% by weight. When the total fineness is less than 30 dtex, the strength of the yarn itself is insufficient, the yarn is easily broken, and stable production becomes difficult. On the other hand, when it exceeds 100 dtex, the flexibility and the thinness of the fabric are deteriorated when a fabric such as a woven fabric is used. Further, when the ratio of the filament B is less than 5% by weight, the appearance is deteriorated. Conversely, when the ratio is more than 30% by weight, the ratio of the filament A is decreased and the strength as a mixed yarn is decreased. The purpose of can not be achieved.

  Furthermore, the mixed yarn of the present invention needs to have a strength in the range of 4.5 to 7.0 cN / dtex. When the strength is less than 4.5 cN / dtex, the strength is equivalent to that of a normal mixed yarn and is insufficient, and the object of the present invention cannot be achieved. On the other hand, when it exceeds 7.0 cN / dtex, yarn breakage occurs frequently during yarn making, and it is difficult to stably produce such a mixed yarn.

  Moreover, the mixed yarn of this invention needs to have the entanglement of 3-10 entanglements / m. When the number of entanglements is less than this range, the filament A and the filament B are easily separated at the time of drawing in the yarn making, and it becomes difficult to perform the drawing process stably. On the other hand, if the number of entanglements exceeds 10 m / m, the filament B cannot be sufficiently stretched out in a loop shape even after heat treatment, and the feeling is lowered, which is not preferable.

  The mixed fiber of the present invention described above can be easily manufactured by, for example, the following method. That is, polyesters having different intrinsic viscosities are heated and melted so that the temperature of the polyester having the higher intrinsic viscosity is 5 ° C. or more higher than the temperature of the polyester having the lower intrinsic viscosity, and each polymer stream is measured. Then, the solution is fed to a spinning pack, and then melt-discharged from different spinnerets in the same spinning pack, preferably at the same temperature as that of the high intrinsic viscosity polyester.

  Here, when the temperature difference between the two polymers is less than 5 ° C., the melt viscosity of the polyester having a high intrinsic viscosity becomes too high and the liquid feeding property is lowered, so that stable spinning cannot be performed, or the low intrinsic viscosity is low. Viscosity polyester is not preferable because the melt viscosity becomes too low or heat degradation causes stable spinning. In addition, it is preferable from the point of suppression of thermal decomposition of a polymer that the spinning pack average residence time of low intrinsic viscosity polyester shall be 2 minutes or less.

  The melted and discharged yarn is focused after cooling and solidification by blowing cooling air, and then passed through a fluid processing device such as an interlace nozzle, and then entangled to give 500 to 2500 m / min, preferably 800 to 1500 m. Take up at the rate of / min. At this time, the intrinsic viscosity of the polyester to be used is such that the intrinsic viscosity of the filaments A and B finally obtained is in the above range. In addition, the fluid processing apparatus is selected so that the number of entanglements is 3 to 10 / m, or fluid processing conditions (for example, air pressure) are appropriately selected and set.

  The undrawn yarn subjected to the entanglement treatment is a temperature of 70 to 100 ° C., preferably 80 to 95 ° C., 2.5 to 4.5 times, so as to be a mixed yarn satisfying the above properties by a conventionally known method. Preferably, the film is heat-set at a temperature of 180 to 220 ° C. after stretching to 3.0 to 4.0 times.

Hereinafter, the present invention will be described more specifically with reference to examples.
[Example 1]
Using the equipment capable of simultaneously spinning polyethylene terephthalate with an intrinsic viscosity of 0.95 and polyethylene terephthalate with an intrinsic viscosity of 0.64 as shown in FIG. After melting, the melt was supplied to the spin pack. At that time, after the measurement was performed so that the discharge weight ratio of the high intrinsic viscosity side to the low intrinsic viscosity side was 8: 2, and the total fineness after drawing was 78 dtex, the mixture was discharged from a spinneret at a temperature of 295 ° C. The discharged yarn was entangled with an interlace nozzle after cooling so that the number of entanglement was 10 / m and wound at a speed of 1000 m / min.

  The obtained undrawn yarn was drawn 3.36 times at a temperature of 95 ° C., and then heat-set at a temperature of 200 ° C. to obtain mixed yarns described in Table 1. Table 1 shows the evaluation results of the obtained mixed yarn.

  The single yarn physical properties of filaments A and B were measured by separating 20 filaments from each other. The intrinsic viscosity was measured at a temperature of 35 ° C. using o-chlorophenol as a solvent.

[Example 2]
In Example 1, the same procedure as in Example 1 was followed, except that the high intrinsic viscosity polyester had a melting temperature of 293 ° C. and was spun and stretched under the conditions shown in Table 2. Table 2 shows the evaluation results of the obtained mixed yarn. In addition, the melt viscosity of the polyester became too high, and the spinning stability was lowered.

  Since the polyester blended yarn of the present invention is produced by the spinning blending method, it is possible to stably produce a blended yarn having a fineness and having both strength and appearance, excellent in quality, etc. Can provide the final product.

It is the schematic of the melt spinning equipment which shows one embodiment of this invention.

Explanation of symbols

1 Core side polymer metering gear pump.
2 Sheath side polymer metering gear pump 3 Polymer supply block 4 Spin pack 5 Spinneret

Claims (2)

  The intrinsic viscosity is 0.75 to 1.00, the stress at 5% elongation is 1.5 to 2.4 cN / dtex, the boiling water shrinkage is 6 to 15%, and the single yarn fineness is 1.0 to 5.0 dtex. Polyester filament A with an intrinsic viscosity of 0.5 to 0.65, a stress at 5% elongation of 1.0 cN / dtex or less, a boiling water shrinkage of 6% or less, and a single yarn fineness of 1.0 to 5.0 dtex It is a spun mixed yarn composed of a certain polyester filament B, the proportion based on the total weight of the blended yarn of the polyester filament B is 5 to 30% by weight, and the total fineness of the mixed yarn is 30. A fine-fineness polyester blended yarn characterized by having ~ 100 dtex, a strength of 4.5-7.0 cN / dtex, and an entanglement number of 3-10 k / m.   Polyesters with different intrinsic viscosities are melted and discharged from different spinnerets in the same spin pack, the discharged yarns are cooled and solidified, converged, mixed and entangled, and then taken as undrawn yarns, then drawn In producing the polyester blended yarn according to claim 1 by heat treatment, the temperature of the polyester fed into the spinning pack is set to be 5 ° C. or more higher for the polyester having the higher intrinsic viscosity than the polyester having the lower intrinsic viscosity. A method for producing a polyester fine yarn having a fineness characterized by comprising:

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