KR100347328B1 - Process for manufacturing poly(trimethylene terephthalate) bulky continuous filaments - Google Patents

Abstract

In the present invention, in producing a polytrimethylene terephthalate bulky continuous filament, the molten polytrimethylene terephthalate is a Y-shaped cross section of 60 holes or more through a nozzle designed to have a release degree of 1.8 to 2.5, and a spinning temperature of 245 to 285 ° C. And the filaments melted and spun at a spinning speed of 1800 to 3000 m / min, and the filaments that are spun are emulsified, stretched and crimped, and are focused by a separate focusing device in units of 15 to 20 times / m. The present invention relates to a method for producing a polytrimethylene terephthalate bulky continuous filament. The present invention can provide a polytrimethylene terephthalate bulky continuous filament having uniform physical properties and excellent spinning properties and cutting properties.

Description

Process for manufacturing poly (trimethylene terephthalate) bulky continuous filaments

The present invention relates to a method for producing a polytrimethylene terephthalate (hereinafter referred to as PTT) bulky continuous filament (hereinafter referred to as BCF), and more particularly to using a properly designed nozzle or The present invention relates to a method for producing PTT BCF having excellent physical properties and excellent spinning workability by a giving method.

As a synthetic material of BCF used in general carpet production, nylon, polypropylene, polyethylene terephthalate, and the like are typically used. Household or office carpets have an antifouling property that can suppress food contamination. In the case of nylon, antifouling agents are used to improve the antifouling properties or to add and modify antifouling agents in the polymer.

Meanwhile, the BCF manufacturing method using polyethylene terephthalate of U.S. Patent Nos. 3,998,402 and 4,877,572 has some disadvantages of antifouling but has a disadvantage in that the pile is broken or loosened. Recently, a method for producing BCF using polytrimethylene terephthalate resin has been published for the production of BCF of a new material having improved these disadvantages. The BCF manufacturing method using PTT disclosed in US Pat. No. 5,662,980 provides a BCF having superior antifouling properties compared to other materials and having excellent bending and pile height preservation. However, even in this case, when using a nozzle with a low degree of release of 1.7, the cross-sectional area of each filament may be different during spinning, resulting in a loss of uniformity of physical properties and a sharp cross-sectional shape, which will withstand the frictional force at the point of contact with the yarn such as fiber guides in the spinning machine. There is a problem such that the weakness is caused by a lot of trimming occurs and the radiation workability is lowered. In addition, the converging of the yarn proceeds at the same time as the bulking and focusing at high temperature, so the focusing force is reduced, and the finishing of piles occurs a lot during the shearing step during the manufacturing process of the carpet. Economic loss is caused by the need to chop off a large amount of yarn during the shearing operation.

The present invention is to improve the disadvantages of the prior art as described above, uniform physical properties, excellent spinning workability and cutting properties to improve the workability in the tufting and sharing step of the carpet manufacturing process to reduce yarn loss It provides a PTT BCF manufacturing method that can obtain an economic effect as.

That is, in the present invention, in producing the polytrimethylene terephthalate bulky continuous filament, the molten polytrimethylenetephthalate is 245 to 285 ° C spinning through a nozzle having a Y cross-sectional shape and 60 holes or more and a release degree of 1.8 to 2.5. Provided are a method for producing a polytrimethylene terephthalate bulky continuous filament characterized by melt spinning at a temperature and a spinning speed of 1800 to 3000 m / min.

In order to further enhance the effect, the spun filaments are subjected to emulsion, stretching and crimping, and then focused by a separately separated focusing device in units of 15 to 25 times / m.

1 is a view schematically showing an apparatus for implementing the manufacturing method of the present invention.

<Description of Signs of Major Parts of Drawings>

Spinneret

2. Filament

3. Quenching area

4. Finish appricator

5. Yarn suction nozzle

6. 1st high bolt roller (feed roller)

7. 2nd and 3rd high bolt rollers (stretching roller)

8. Texturing nozzle

9. Cooling drum

10. 4th goth roller

12. 5th gossip roller

13. Guide roller

14. Winder

Hereinafter, a method for producing a polytrimethylene terephthalate bulky continuous filament according to the present invention will be described in detail with reference to the accompanying drawings.

In the case of producing polytrimethylene terephthalate bulky continuous filaments according to the present invention, PTT polymer having an intrinsic viscosity of 0.8 to 1.2 and a moisture of 50 ppm or less is melt-spun and spun at a spinning speed of 1800 to 3000 m / min at a temperature of 245 to 285 ° C. Pass the spinret (1). At this time, the nozzle has a Y-shaped cross section, 60 holes or more, and one having a release degree of 1.8 to 2.5 is used. In the present invention, when using a nozzle having a low degree of release less than 1.8, the cross-sectional area between each filament is uneven during spinning, resulting in poor uniformity of physical properties, and the shape of the cross section becomes sharper, which is in contact with yarn such as a fiber guide in the spinning machine. The strength to withstand the frictional force in the weak is a lot of trimming occurs, radioactivity is less. In addition, when using a nozzle having a large degree of release of more than 2.5, the yarn stiffness is sharply dropped, making normal spinning work difficult.

The filament 2 radiated from the nozzle is cooled by cold air at a speed of 0.4 to 0.6 m / min in the quenching area 3. At this time, the cooling temperature is preferably 10 to 25 ℃.

After cooling, the oil is subjected to a spin finish step of oiling. The oil is mixed by mixing the emulsion stock and the mineral oil in the first and second stages of the finish appricator (4). oil) It improves the focusing power, lubricity and smoothness of the company. Then, the feed roller 6 having a temperature of 45 to 65 ° C. and a speed of 650 to 850 m / min is passed through a fiber suction nozzle 5 provided with an aspirator that sucks the broken thread during spinning. Stretching is carried out at a ratio of 3.0 to 3.5 between the single high bolt roller and the stretching roller 7 (second and third high bolt rollers) at 140 to 180 ° C and 1800 to 3000 m / min. The filament passing through the stretching roller 7 passes through a bulking unit 8 with a texturing nozzle to impart bulkiness, at a temperature of 180-220 ° C. inside the bulking unit 8. Hot air is blown at a pressure of ⁶ to 7 kg / m ² to allow the filament to be crimped in three dimensions. The crimping rate at this time is preferably 4 to 20%.

The filament that has passed through the bulking unit 8 is cooled to 15-22 ° C. while passing through the cooling drum 9 and passed through an interlacer 11 via the fourth high bolt roller 10. In this part, in order to improve the focusing force of the yarn, a slight twist and a knot are applied at a pressure of 4.0 to 5.0 kg / m ² , which is preferably 15 to 25 times / m. If the interlacer 11 focuses less than 15 times, the focusing power is lowered in general yarns, so that a lot of bobbins or pin yarns occur during weaving, resulting in poor weaving work. In the tufting step, which is an intermediate step of carpet manufacturing, Due to the poor cutting property of the yarn, a lot of loosening of the yarn occurs in the shearing work stage, and thus a problem of having to shave a large amount of yarn in order to have a carpet-like appearance made of nylon. If it exceeds 25 times, even after dyeing and post-processing, the unfocused state remains unchanged, resulting in damage to the appearance of the carpet.

Thereafter, the final winder 14 is wound around the fifth gothic roller 12 and the fiber guide 13. The speed of the winder is determined based on the speed of the fifth gothic roller, which is approximately 1700-2800 m / min.

Hereinafter, the present invention will be described in detail with reference to the following examples, but the scope of the present invention is not reduced by the following examples.

Examples 1-3 and Comparative Examples 1-2

A PTT polymer having an intrinsic viscosity of 0.92 and a moisture content of 40 ppm was melt-spun into 1300 denier and 68 filaments at 250 ° C. in a Y-section, 68-hole nozzle using a barmag spinner having 3 tons of radioactivity. At this time, the degree of release of the nozzle was changed to 1.8, 1.9 and 2.1 in Examples 1 to 3 and 1.5 and 3.0 in Comparative Examples 1 and 2, respectively. Cooled by cold air at 0.5 m / min and 16 ° C. in the cooling zone. The stretching operation was performed at a feed roller and a stretching roller at 60 ° C and 160 ° C, respectively, and a roller speed of 700m / min and 2300m / min, respectively. The bulking unit internal temperature was 200 ° C., and then cooled to 16 ° C. in a cooling drum. In the focusing device, a concentration of 20 times / m was given at a pressure of 4.0 kg / m ² . Winding speed of the final winding was 1950m / min to prepare a PTT BCF.

The PTT BCF company evaluated the radio workability and produced a carpet with it to evaluate the tufting (tufting workability) step is shown in Table 1. Examples 1, 2 and 3 were excellent in both spinning work and tufting workability, and Example 2 having a release degree of 1.9 showed the best results. In Comparative Example 1, the strength and the tufting workability were similar to those of the example, but the number of trimmings was high.

division Shape House Radiation workability Tufting workability Intensity (g / d) Example 1 1.8 20 times / m 12th ◎ 2.1 Example 2 1.9 20 times / m 9th ◎ 2.1 Example 3 2.1 20 times / m 15th 2.0 Comparative Example 1 1.5 20 times / m 20 times 2.1 Comparative Example 2 3.0 20 times / m Not measurable Not measurable Not measurable

[Measurement of physical properties]

1) Deformability: The ratio of the outer diameter adjacent to the outer diameter adjacent to the inside of the yarn 1 filament.

2) Radioworkability: Number of trimmings for 3ton yield.

3) Tufting workability: It shows the cutting property of the file and indicates as below

◎: very good Good △: Normal ×: Poor

4) Strength: Measured according to KS K 0412 standard using the universal tensile tester under the condition of 20cm of sample length, 20cm / min of tensile speed, 20g of super load, 8 times / 10cm of twist.

Examples 4-5 and Comparative Examples 3-4

Using the nozzle of the degree of release 1.9 showing the best results in the experiment, it was carried out in the same manner as in the above example except that the number of focusing. In Examples 4 to 5 and Comparative Example 3, experiments were performed by varying the number of focusing in the separate focusing apparatus, and in Comparative Example 4, the bulking and focusing were simultaneously performed in the bulking unit.

Examples 4 and 5 had excellent loss of yarn of 20% or less during sharing. In Comparative Example 3, the normal cutting was not made during the tufting operation, so that the shearing operation was not progressed. In Comparative Example 4, the yarn was excessively generated with 30% loss.

As can be seen from the above results, the release degree 1.9, when the focusing in the separate focusing device is given 20 times / m it can be seen that the most optimal workability and physical properties can be expressed.

division House Shape Tufting workability Sharing workability Remarks Example 4 20 times / min 1.9 ◎ 17% Example 5 25 times / min 1.9 ◎ 18% Comparative Example 3 10 times / min 1.9 × Not measurable Comparative Example 4 20 times / min 1.9 30% Bulk and concurrent

[Measurement of physical properties]

1. Release degree, tufting workability: measured in the same way as above

2. Shearing workability: Measured as a percentage of the weight of yarn lost during operation, relative to the weight of the yarn before the shearing operation.

As described above, the present invention can provide PTTBCF having excellent physical properties and excellent spinning performance. In addition, in the case of using the PTT BCF of the present invention, the cutting property is improved in the tufting step, which is an intermediate step of the carpet manufacturing process, and the workability is increased, and the loss of yarn can be drastically reduced even in the finishing step of the sharing step. Economic effect can be obtained.

Claims (4)

In producing the polytrimethylene terephthalate bulky continuous filament, the molten polytrimethylenetephthalate is formed by Y-shaped cross section of 60 holes or more, and has a release temperature of 245 to 285 ° C. and 1800 to 1,200 through a nozzle designed for 1.8 to 2.5. A method for producing a polytrimethylene terephthalate bulky continuous filament, characterized in that the melt spinning at a spinning speed of 3000 m / min. The method of claim 1, further comprising the step of concentrating the melt-spun filaments in an amount of 15 to 25 times / m by a separate focusing device after emulsifying, stretching, and crimping. Method for producing a polytrimethylene terephthalate bulky continuous filament, characterized in that. The method for producing a polytrimethylene terephthalate bulky continuous filament according to claim 2, wherein the filaments are stretched at a ratio of 3.0 to 3.5 by the stretching process. The method for producing a polytrimethylene terephthalate bulky continuous filament according to claim 2, wherein a crimping ratio of 4 to 20% is given to the filament by the crimping process.