JPS6385110A - Production of polyester special yarn - Google Patents

Abstract

PURPOSE:To produce the titled yarns having an intermittent difference in thickness and dyeing property in the fiber axis direction, by arranging circular spinning holes on a minute circumference, fusing extruded filaments after melt spinning to give a yarn having an U-shaped cross section and drawing the resultant yarn under specific condition. CONSTITUTION:Polyester filaments are melt spun through a spinneret having four circular spinning holes (H) arranged on the circumference having 0.32-0.60mm diameter and fused just under the spinneret just after spinning to give a yarn having an U-shaped cross section. The diameter of the spinning holes (H) is 0.10-0.30mm, preferably 0.16-0.30mm. The resultant spun yarn is subsequently hot-drawn at 50-75 deg.C, preferably 65-70 deg.C. The draw ratio [DR (times)] is within the range of -1.2X10<-3>YS+4.1--9X10<-4>YS+4.1 when the taking off speed [YS (m/min)] is 1,000-1,500 and -6.0X10<-4>YS+3.2--9X10<-4>YS+4.1 when the YS is 1,500-2,000.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a special polyester material having irregular strength and elongation properties, heat absorption properties, dyeing properties, uneven thickness, etc. in the length direction of +Jt fibers. This invention relates to a method for manufacturing yarn.

(Conventional technology) In general, polyester 4Rm has excellent physical properties.

Because it has chemical properties, it is used in a wide range of applications, including clothing and industrial materials. However, when used for clothing, polyester fibers have a slimy, waxy, and waxy feel.
Due to its coldness, it is extremely inferior to natural #a fiber in terms of texture.

Therefore, various approaches have been taken to solve these disadvantages peculiar to polyester fibers and to obtain polyester fibers with a texture superior to that of natural m-fibers and a shading effect due to the difference in dyeability. In addition, research has been carried out on threads with intermittent parts of different thickness in the fiber axis direction, and recently, Japanese Patent Application Laid-Open No. 5,5-80524 has developed yarns with diameter changes in the d-axis direction and thicker parts. There is a difference in dyeing in the thin parts,
Furthermore, a polyester long fiber thick and thin yarn has been proposed in which the thick portions that exist partially intermittently have a curved deformed cross section.

Moreover, conventional methods for obtaining such yarns include supplying two or more types of yarns using a design twisting machine, a twisting machine, a false twisting machine, etc., and setting a feed rate difference between the yarns. It is also possible to make heathered threads and marbled threads by supplying two or more types of threads with different dyeability or threads dyed in different colors in advance and using similar means and methods. , it has been pointed out that all of these methods have high manufacturing costs and are severely restricted in terms of manufacturing equipment.

Further, Japanese Patent Publication No. 61-25802 discloses a method for producing the above-mentioned special yarn by a so-called direct spinning/drawing method in which polyester is melt-spun, then taken off and stretched without being wound once.

(Problems to be Solved by the Invention) However, the method proposed in the former publication utilizes alkali treatment, which exhibits a special deformation behavior and gives a curved deformation.

Therefore, some embrittlement of the polyester yarn is inevitable, and in particular, it is necessary to consider the combination of appropriate conditions that can withstand the alkali treatment, which also involves manufacturing problems.

In addition, the special yarn produced by the latter direct spinning/drawing method has a lower draw ratio than the general yarn produced by the direct spinning/drawing method, so it changes significantly over time and is difficult to handle in subsequent processes. cannot withstand alkaline treatment.

The present invention solves such problems, and is a method for producing with high efficiency polyester special yarn that has intermittent differences in thickness and dyeability in the IR fiber axis direction and has strength and elongation properties similar to general yarns. The purpose is to provide

(Means for Solving the Problems) That is, the method of the present invention uses a direct spinning drawing method in which a diameter of 0.
Four circular spinning holes of 10~o, ao mm with a diameter of 0
．． A spinneret made of polyester filaments arranged on a circumference of 32 mm to 1 mm. [The spun filaments are spun and taken at a speed of 1000-2000n/m1nO, and the spun filaments are fused directly under the spinneret immediately after spinning to form a yarn with a substantially U-shaped cross section, and then the yarn is spun. It is characterized by stretching the strip at a temperature of 50 to 75°C and at a magnification that satisfies the following formula.

-i, xio ・YS+4. ≦D≦−9×10
・YS + 4.1 (However, YS depth 1000-150
0) -6.2×l0-'-ys+aF≦DR≦-5xxo-
'-YS+4.1 (78-1500~2000) (In the formula, ys is the take-up speed (m/+), DR is the stretching ratio (
times). ) The polyester referred to in the present invention has as a main component polyethylene terephthalate consisting of terephthalic acid or its lower alkyl derivative and ethylene glycol, or terephthalic acid or its lower alkyl derivative, ethylene glycol and at least one eighth component. It is polyester.

In this case, the eighth component includes, for example, aliphatic dicarboxylic acids such as oxalic acid, adipic acid, azelaic acid, and sepacic acid, aromatic dicarboxylic acids such as isophthalic acid, phthalic acid, and 2,6-naphthalene dicarboxylic acid, trimellidic acid, Polyfunctional compounds such as pyromellitic acid and their lower alkyl esters or glycol esters having 2 to 10 carbon atoms, diefV glycol, propylene glycol,
Examples include polyethylene glycol, butanediol, glycerin, and pentaerythritol.

The polyester is melt-spun from a modified cross-section fiber spinneret consisting of four circular spinholes arranged at specific locations. The circular spinning hole has a diameter of 0.10 to 0.80 mm, preferably 0.16 to 0.80 mm, and the spinning hole has a diameter of 0.3 mm.
It is necessary to arrange four pieces on a circumference of 2 to 0.60 mm.

If the diameter of the circular spinning hole is outside the range of 0.1θ to 0.80 mm and is less than 0.10, polymer clogging occurs frequently at the spinneret, making spinning difficult; if it exceeds o or ao, spinning becomes difficult. The draft becomes too high and uneven discharge occurs, which causes uneven fineness in the longitudinal direction of the yarn and increases the number of yarn breakages. or,
The diameter of the circle forming the circumference arranging the four circular spinning holes is 0.32 mm.In the case of no groove, all the spun polymers are fused and a U-shaped cross-section fiber cannot be obtained;
If it exceeds 100%, conversely fusion occurs and the desired U-shaped cross-section fiber cannot be obtained. Furthermore, as shown in FIG.
The angle formed by the center of the circumference of mm and the centers of two mutually adjacent circular spinning holes I is '1 sα2. It is preferable that a8 and α4 are arranged so as to fully satisfy the following formulas (1) to (4)0 60″≦α1≦85@ ・・・・・・・・・ (1
) 60@≦α2≦ 90@ ・・・・・・・・・ (
2) 95"≦as≦180' -----------
(3) 60″≦α4≦90″ ・・・・・・・・・
(4) (However, α1 * "2 *" 8 and α4 are arranged in this order, and the maximum angle 'k (1 m).) After melt spinning the polyester filament, it is The spun filaments spun through the circular spinning hole I are fused to obtain a yarn having a substantially U-shaped cross section.

The polyester filament yarn having a U-shaped cross section as described above is subsequently subjected to a drawing treatment without being wound up. Any direct stretching method can be adopted for the stretching process, but usually a device with a roller that serves as a take-up roller and a preheating supply row 2 under the spinneret and a stretching row 2 installed downstream of this row 2 is the most efficient. It is compact and advantageous in manufacturing.

FIG. 1 is a schematic diagram showing an example of a preferred direct rolling method, in which 1 is a spinning device, Y is a spun yarn, 2 is an oil roller, 8 is a take-up roller that also serves as a preheating supply roller, and 4 is a separate 5 is a stretching roller, 6 is an entangling nozzle, and 7 is a wine goo.

The yarn Y spun by the spinning device 1 is applied with oil by the oiling roller 2, wound several times around the take-off roller 8 preheated to the drawing temperature via a separate row 24t, and taken off at a predetermined speed. At the same time, it is preheated to a stretching temperature, and after being stretched to a predetermined magnification by the next stretching row 26, interlacing is applied by an interlacing treatment nozzle 6 as required, and the film is wound up into a wonder 7.

In the present invention, the surface speed of the take-up row 28 at this time is 1000 to 20002F! / minute. When the take-up speed increases to 2000 m/min, the contrast between the thick and thin portions of the resulting yarn Y becomes insufficient. Also,
When the take-up speed is less than 1000 m/min, productivity decreases and furthermore, the obtained thick and thin yarn tends to change over time.

Further, the preheating temperature of the take-up roller 8, that is, the stretching temperature is 60°C.
-75°C, preferably 60-75°C, more preferably 6
Stretching is performed by heating at a temperature of 5 to 75°C. Heating temperature is 50
If the temperature is lower than 0.9°C, stretching becomes extremely uneven during stretching, resulting in a large number of loose filaments, and single filament breakage occurs when winding up the cheese, unwinding it, and performing weaving and weaving.

In the case of polyester filament yarn with a U-shaped cross section as in the present invention, it is a special yarn that maintains a good appearance and feel even when heated at temperatures of 50°C or 60°C or higher, and also suppresses sagging of the filament. This is preferable because it can prevent thread breakage due to cheese unrolling and fuzz generation.

The stretching ratio of the present invention varies depending on the above-mentioned take-up speed,
When the take-up speed is t-y8 (m, 4) and the stretching ratio is DR (times), the following formula (%) must be satisfied. If the stretching ratio is lower than the above range, the strength required for clothing cannot be obtained, and loose filaments cause severe targing, resulting in poor operational performance in subsequent processes.

If the stretching ratio is higher than the above range, there will be little unevenness in fineness in the longitudinal direction of the fibers and between the fibers, and the shading effect will be extremely weak.

Further, in the case of the A-R fiber having a U-shaped cross section of the present invention, it is possible to produce fibers with varying dyeability by simply changing the stretching conditions, and there is no need for cold stretching.

That is, by applying sufficient heat, the structure of the fiber itself becomes very stable, making it very easy to handle the fiber in subsequent steps. In particular, the ability to obtain fibers that can be processed for weight loss has expanded the scope of use.To describe specifically the unique shape of special yarns made of industrial fibers, the filaments have uneven thickness in the longitudinal direction. However, the thick cross section of the filament is within a range of 1.20 to 8.00 times the area ratio of the thin cross section, and the number of filaments having a thick cross section is 80% or less of the total, preferably 70% or less. , furthermore, when the length of the part with uneven thickness is 0.5 to 5 cm, plO per 1 m
It is a special polyester thread having ~80 pieces. in this case,
If the cross-sectional area of the thick filament is less than 1.20 times, the shading effect will be weak, and if the cross-sectional area of the thick filament is more than 3 times that of the thin filament, the single fiber strength of the thick filament will be extremely low, and it will be There is a tendency for thread breakage to occur after the product is made.

However, if the number of filaments with a thick cross section exceeds 80% of the total, the strength of the yarn in that area becomes extremely weak, making it impossible to use it practically.

Judging from the appearance after becoming a textile product, it is effective that the length of the part with uneven thickness is 0.5 to 5-Ocm and the number of pieces is 10 to 80 per 1 m. . When the length is Q and 5 cm or less, the difference in shading is not noticeable, and 6.
If it is 0 cm or more, the darkly dyed part will be too noticeable and the quality will deteriorate. Also, if the number is less than 10, the dyeing difference will be weak, and if it is more than 80, it will become too strong.

(Example) Example 1 Polyethylene terephthalate having an intrinsic viscosity of 0.64 measured in a mixed solvent of 6:4 phenol and tetrachloroethane was spun through a circular spinning hole with a diameter of 0.2 mm and a diameter of Q.
On the circumference of 4111m, ax=so@, α2=α4=8
Using a spinneret with 86 sets of unit spinning holes arranged in four units at 6°, α, = 110@, the spinneret was discharged at 290°C, and the first
Using the device shown in the figure, the drawing speed is 1500 m/min and the temperature is 70°C.
After winding the yarn 8 times around a take-up preheating roller set at The physical properties of the obtained special yarn were a strength of 4.2 f/D and an elongation of 48%, with sufficient unevenness in thickness and density difference in the length direction of the fibers.

Example 2 The same polyethylene terephthalate yarn as in Example 1 was obtained using the same equipment and under the same conditions except that the stretching ratio and cross-sectional shape were changed. Table 1 shows the evaluation results of the obtained special polyester yarn.

Table 1 Also, a plain weave was woven with the obtained special polyester yarn, and 2
When 0% alkali weight loss processing was performed, cases 1 to 8. There were no problems with the fabric using the special yarn of Magne 5, but the plain fabric using the yarn of Nagi 4 had moth-eaten parts and was of low quality.

(Effects of the Invention) As described above, the polyester special yarn obtained by the present invention has fa, moderate thickness unevenness in the off-axis direction, and density difference, and is also excellent in strength and elongation and change over time. It has consistently stable physical properties. Furthermore, the special thread can withstand weight loss processing using alkali and the like, and has a wide range of applications, making it extremely useful.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a spinning/drawing apparatus used in the present invention, and FIG.
FIG. 2 is an explanatory diagram showing an arrangement of 41 vA circular spinning holes. 1...Spinning device, 8...Preheating supply roller, 5...Stretching roller, 7...
... Wine goo, H ... Circular spinning hole, Y
・・・・・・Spun yarn, Figure 1

Claims (3)

[Claims] (1) In the direct spinning drawing method, the diameter is 0.10 to 0.3
Four circular spinning holes with a diameter of 0.32 to 0.60 m.
Polyester filaments are melt-spun from a spinneret arranged on a circumference of 1,000 to 2,000 m.
/min, and the spun filaments are fused directly under the spinneret immediately after spinning to form a yarn with a substantially U-shaped cross section, and then the yarn is heated at 50 to 75°C. A method for producing a special polyester yarn, which comprises stretching at a temperature of and at a ratio that satisfies the following formula. -1. ^2×10^-^3・YS+4. ^1≦DR≦-
9×10^-^4・YS+4. ^1 (However, YS=100
0-1500)-6. ^0×10^-^4・YS+3.
^2≦DR≦-9×10^-^4・YS+4. ^1 (However, YS = 1500 to 2000) (In the formula, YS is the withdrawal speed (
m/min), DR is the stretching ratio (times). ) (2) The method according to claim 1, wherein the circular spinning hole has a diameter of 0.16 to 0.30 mm. (3) The method according to claim 1, wherein the temperature during stretching is 60 to 75°C.