KR880001031B1 - Improved partially oriented nylon yarn and process - Google Patents

Abstract

A sheath-core filament spun at least 2200 MPM is characterised in that it has a nylon 66 sheath component surrounding a polymeric core component, the sheath component having a higher melt viscosity (at 284≰C) than the core component. Also, claimed are; (i) a process for spinning the sheath core filament; and (ii) prodn. of a textured yarn comprising simultaneously drawing and friction-twist texturing the filament. The filaments have high RV sheaths and low RV cores. Exceptional crimp developement is achieved in the resulting textured yarn.

Description

Nylon yarn with partially improved crimp and its manufacturing method

1 is an example of the spinning process of the present invention,

2 shows a cross-sectional view of the filament according to the present invention.

* Explanation of symbols for main parts of the drawings

20 molten polymer stream 22 detention

24: cooling zone 26: filament

28: yarn 30: conditioner tube

32: Finish Roll 34, 36: Godet

38: Package 42: Seed

44: core

The present invention relates to a false twisted yarn having a crimpability characteristic by providing a filament composed of a seed component having a high relative viscosity and a core component having a relative viscosity lower than the seed component, and a nylon 66 in the present invention is a polymer. By linear synthetic polyamide, at least 85 wt% of units of the structure

Apparel yarns made of conventional nylon 66 are wound at a low speed of about 1400 meters per minute, wound on bobbins, and then drawn on the next machine, and then wound on bobbins, and then the drawn yarn is about 55 to 55 minutes per pin-twisted method. By burning at a low speed of 230 meters, it has been manufactured with high quality stretch yarns suitable for stretch garments such as leotards. An example of a flammable device in a pin-twist burnout process can be found in US Pat. No. 3,475,895. Recently, however, various types of combustors, collectively called frictional flammables, have been widely used commercially, the most widely used of which are mentioned in US Pat. Nos. 3,973,383, US Pat. No. 4,012,896 or US Pat. No. 3,885,378. It is a general type composed of a combination of disks.

As the combustion method was changed to frictional combustion, the feed yarns in the frictional combustion process also changed to partially crimped Lylon 66 (PON). In a typical nylon 66 spinning process, yarns made of nylon 66 have been produced by simply increasing the winding speed from a pre-set 900-1500 meters per minute to generally 2750-4000 meters per minute. Such nylon 66 yarns are spun at a higher speed than pre-stretched yarns or the yarns spun at low speeds as described above during the friction burning process. However, the twisted yarns based on the frictional twisting method up to now have a significantly lower disadvantage than those twisted by the pin-twist process in terms of crimping. Therefore, the current market of false twisted yarn is expensive because of using the old method, but it is burned by high quality pin type combustion method and low cost but low quality friction burning method by using the new method. It is formed. Combustible PON feed yarns have a relative viscosity value in the range of medium or greater than 30 to less than 40, as described in US Pat. No. 3,994,121. These yarns have a strength that is more suitable for the manufacture of conventional garments. It is things that have.

In the conventional nylon 66 polymerization technology, since the polymer relative viscosity is increased, the manufacturing cost is high and the gel formation rate is increased, resulting in shortening the life of the spin pack (filter). Therefore, a polymer having a high relative viscosity was not generally used except in the special case of manufacturing a high strength yarn. In recent years, however, it has been found that in manufacturing false twisted yarn with PON feed yarn having a high relative viscosity, in some cases, it is possible to manufacture twisted yarn with increased crimpability compared to the twisted twisted yarn by a pin type flammable method.

This increase in crimping is to provide a substantially improved fabric coverage compared to fabrics treated with false twisted yarns made from nylon 66 feed yarn referred to in US Pat. No. 3,994,121. Thus, less combustible yarns are required to have a uniform coatability and nylon 66 yarns with high relative viscosities increase productivity in spinning and combusting processes.

The present invention provides a method for producing a false twisted yarn with a significantly improved crimping property than the conventional pin type twisted yarn in some cases by using a new PON feed yarn, thereby providing a small amount of yarn to the fabric. Even if used, it is to have the coating property of the fabric equivalent to the twisted yarn pin type.

Extensively, the yarns of the present invention are high speed spinning combustible feed yarns characterized by a seed and core composite structure formed of a core and a seed made of nylon 66 polymer having a higher melt viscosity at 284 ° C. than a polymer forming a core. As such, the mechanisms and exact reasons for the improved results of the present invention are incomprehensible.

A feature of the present invention is to provide a seed-core filament spun at a spinning speed of at least 2200 MPM, wherein the filament is composed of a nylon 66 seed component having a higher melt viscosity than the core component at 284 ° C. surrounding the core component. In another aspect, the melt stream of nylon 66 seed component and core component having a higher melt viscosity at 284 ° C. than the core component is extruded through a capillary tube and cooled to form a filament, which is recovered at a spinning speed of at least 2200 MPM. To provide a method for spinning a seed-core filament comprising a box, on the other hand to provide a method for producing a false-twist yarn that simultaneously draws and combusts the seed-core filament spun at a spinning speed of at least 2200 MPM.

In the present invention, the core component is nylon 66, and the relative viscosity of the seed component is preferably at least about 10 higher than that of the core component in relative viscosity units, but the most suitable relative viscosity is 20 in relative viscosity units than the core component. It is high enough. It is preferable that the relative viscosity of the seed component is at least 50, More preferably, it has a relative viscosity of at least about 60.

The optimum volume ratio of seed and core is about 3: 7. The spinning speed should be chosen to achieve good results with an elongation of less than 150%, i.e. between 50% and 120%.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the molten polymer stream 20 is extruded through the capillary of the cap 22 to the cooling table 24 where the cooling air at room temperature is supplied transversely and slightly downward from the mold in the cooling table. After being solidified at a spaced point to become a filament 26, and then bonded in the form of a yarn 28, it passes through an interfloor conditioner tube 30. The yarn 28 passing through the interfloor conditioner tube is subjected to a conventional spin-finish with a finish roll 32 and partially wrapped with the Godet 34 and Godet 36 and then wound into a package 38. In some cases, the pneumatic tangle chamber 40 may entangle the filaments.

In general, the Godet 34 and the Godet 36 have a function of recovering the filament 26 from the cooling table 24 at a spinning speed determined according to the circumferential speed of the Godet 34 and the yarn 28. It serves to reduce the tension from the high level just before the Godd 34 to a level suitable for winding in the package 38.

Winding tension ranges from 0.03 to 0.25 g per denier. A particularly suitable tension is about 0.1 g per denier. If it is possible to obtain just before winding the tension of the yarn as described above, the godet 34 and the godet 36 may not be provided.

The yarn tension in the present invention means the tension of the yarn measured immediately before the yarn is traversed and wound. Some commercially available winding machines are those equipped with auxiliary rolls that can reduce the tension of the yarn to have a tension suitable for crimping in the saga bobbin or package while traversing the yarn.

Such winding machines may be used in the case of winding up the yarn tension greater than the above.

Technique of the conventional method

Example 1

This embodiment describes an example of a conventional method that is currently implemented.

Nylon 66 polymers with a relative viscosity of 39 were extruded through conventional spin packs and caps at a melting temperature of 285 ° C. The detention 22 consists of 34 capillaries, 0.009 inches (0.229 millimeters) in diameter and 0.012 inches (0.3 millimeters) in length, and the cooling stand 24 is 35 inches (60.96-88.9 cm) in height and cooled to 20 ° C. It is designed to deliver air at an average horizontal speed of 1 foot per second (30.5 centimeters). The filaments 26 are joined at a point about 36 inches (91.4 centimeters) from the bottom of the detention to form yarns 28. Conditioner tube 30 passes yarn 28 through a steamless tube heated to 120 ° C., such as known in US Pat. No. 4,181,697, which is 72 inches (183 centimeters) in length. The speeds of the Goddette 34 and the Godet 36 were 4100 meters and 4140 meters per minute to prevent the saga from lapping on the Godet 36, and the injection speed of the polymer could be 89 of the winding yarn denier. Selected to be. The winding machine used was Toray 601 type and the winding speed was adjusted to have a winding force of 0.1g per denier. The elongation of the wound yarn was 65-68% and the relative viscosity was 41 (about 700 poise at the viscosity calculated at 284 ° C, ignoring the shear stress).

미터짜리 히이터 및 피이드로울과 드로우 또는 미드 로울 사이의 연신 구역내에 쿄세라 세라믹 디스크 들로 된 버막디스트 어그리 게이트를 사용하는 버막 FK 6-L900가연기로 마찰형 가연을 하였다. 히이터의 온도는 225℃로 하고 디스크의 원주 속도와 연신 로울의 속도비(D/Y 비)는 1.95로 하였다. 연신 로울의 속도는 분당 750미터로 고정하였으며 피이드 로울의 속도는 연신비와 이에 다른 연신 가연장력(히이터 출구와 어그리게이트 사이에서의 사의 장력)을 조절하기 위하여 다소 느린 속도로 조정하였다. 권축성을 최대로 하기 위하여 연신비는 피이드로울의 속도에 맞추어 변화시키므로써 연신 가연 장력이 가연 구역내에서 안정성을 충분히 유지할 수 있도록 하였고, 필라멘트가 절단되지 않을 정도로 충분히 약한 가연장력의 범위를 유지할 수 있도록 하였다. 최대 가연 장력이란 필라멘트가 절단되어 적합하지 않은 수준의 프레이의 형성 없이 초기에 권축성을 최대로 나타내는 장력을 의미하는 것으로 kg당 필라멘트가 10줄 이상 절단되는 것들은 상업적으로 사용이 부적합한 것이다.Next, while stretching the spun yarn

Friction type combustion was performed with the Vermak FK 6-L900 combustor using a bust heater and a Burrist aggre gate made of Kyocera ceramic disks in the draw zone between the feed and draw or mid-rows. The temperature of the heater was 225 ° C and the speed ratio (D / Y ratio) of the circumferential speed of the disk and the stretching roll was 1.95. The drawing roll speed was fixed at 750 meters per minute, and the feed roll speed was adjusted to a slightly slower speed to adjust the draw ratio and other draw tensions (tension of yarn between the heater exit and the aggregate). In order to maximize the crimping, the draw ratio is changed according to the speed of the feed roll so that the draw flap tension can be sufficiently maintained in the flammable zone, and the range of the flammable tension that is weak enough not to cut the filament. It was. The maximum flammable tension refers to the tension at which the filament is cut and initially exhibits the maximum crimp without forming an unsuitable level of fryer.

The range of effective twist tensions of the yarns obtained in this example becomes very narrow in the case of stretch twisting at 750 MPM. The maximum flammable tension was about 0.43 g per draw throw denier, with about 13-15% of the aging crimp (the yarn left on the bobbin for two weeks after burning). The drawer's denier is defined as the spinner's denier divided by the mechanical draw ratio obtained by the different surface velocities of the feed and feed rolls that feed the yarns to the heater and the draw and mid-rolls of the combustor. If the flammable tension is more than 0.45 g per draw throw denier, the filament cut to an unsuitable level will appear. Attempts to increase the initial crimp by increasing the temperature of the heater above 225 ° C. resulted in inadequate levels of cut filaments. The denier of the combustible yarn was about 70.

Example 2

This embodiment is an example of a PON company having a high relative viscosity.

The spinning process of Example 1 was repeated except that the polymer was selected and dried to give a relative viscosity of yarn of about 70 (about 2200 poise at a viscosity calculated at 284 ° C. ignoring the shear stress). PON's denier was 98, and its proficiency was 88%.

It was found that the maximum twist tension when the spun yarn obtained in this example was stretched and burned (heater temperature 245 ° C.) was 0.54 g per drawer denier. It was wide. Denier was 70 and the crimp was 18%. The fabric processed with the twisted yarn obtained in the present example was superior to the fabric made of the twisted yarn twisted with the pin type because the coating property and the stretchability were superior to those of the twisted yarn of the first embodiment. In order to improve the crimping rate, the twist tension was further increased, but only the filament or yarn was cut.

2 shows a seed-core filament according to the invention in which the seed 42 surrounds the core 44. Detaining packs designed to form such seed-core filaments are well known in the art. The seed 42 in the present invention is spun at a spinning speed of at least 2200 MPM at a temperature lower than the core 44.

Example 3

This example illustrates the present invention, except that the apparatus of Example 1 is replaced with the detention packs used in Examples 1 and 2 by detention packs designed to extract 34 rows of seed-core filaments. It was used as it is. The first batch was prepared by drying a nylon 66 polymer to produce a yarn having a nominal relative viscosity of 75 (about 2570 poise at a viscosity calculated at 284 ° C. ignoring shear stress), and the second batch had a nominal relative degree of The nylon 66 polymer is prepared by drying to prepare a yarn of 41 (ignoring shear stress, about 700 poise at a viscosity calculated at 284 ° C.). The polymer was spun under the conditions set forth in Example 1 to obtain a seed-core filament in which a seed was formed of a polymer having a high relative viscosity and a core was formed of a polymer having a low relative viscosity. The volume ratio of the seed to the core was 2: 3, that is, 40% of the filament was formed as a seed component and the remaining 60% as a core component. PON's denier is 108 and its elongation is 79%.

The twisted twisted twisted PON yarn by the friction type twisting method with the maximum twisting tension had a denier of 70 and a high crimping rate of about 23%. These figures not only provide a significant improvement in the crimping rate not obtainable by any company using the friction type combustion method, but also far exceed those obtained by various pin type combustion methods. The fabric made of the twisted yarn of the present invention with increased crimping rate thus provides much better stretchability and coverage compared to fabrics made of twisted yarns by all friction type twisting methods known in the art.

Example 4

It has been found that giving some stretching (extension ratio 1.05 to 2.0) before winding may in some cases result in improved results. Example 3 was repeated except that the draw ratio was about 1.3 by setting the speed of the Godet 34 to 3154 MPM.

PON's denier was 100, the elongation was 64%, and the high-strength crimp of flammable yarn with 70 denier was 24%.

Example 5

The method of Example 3 was repeated except that the detention made to emit 34 rows of filaments was replaced with an emergency prepared to emit 68 rows of filaments. The polymer constituting the sheath is nylon 66 with a relative viscosity of 70 (ignoring the shear stress and about 2200 poise at a viscosity calculated at 284 ° C.) and the polymer constituting the core has a relative viscosity of 39 (ignoring the shear stress 284). Nylon 66) with a viscosity calculated at < RTI ID = 0.0 > The volume ratio of the seed to the core was 2: 3. The denier of the company was 108, the elongation was 76%, and the 70 denier combustible yarn obtained had a crimping degree of 14%. Therefore, it was found that the crimping performance is comparable to that of Example 1 in consideration of only half of the denier per filament.

The fabrics made with the false twisted yarns of this example are stretchable compared to the fabrics made with the false twisted yarns of Example 21, giving the fabrics much improved coverage and flexibility. However, fabrics made of friction-twisted yarns with a relative viscosity of 50 with filaments of 68 rows of filaments have a better coating property than fabrics made of friction-twisted yarns with 70 deniers with 34 filaments. However, since the high crimping rate is about 8 to 10%, it does not have the above effective extensibility.

Example 6

The method of Example 5 was repeated except that the spinning and winding speeds were reduced to 2000 MPM and the polymer injection rate was reduced to 132 deniers and 132% elongation. The high crimping degree of combustible denier 70 was 9-10%, and the improvement of crimping, which is the main feature provided by the present invention, can be obtained only at spinning speeds of about 2200 MPM or more.

Example 7

It is preferable that the volume ratio of the seed component and the core component is 1: 1 or less, but a ratio of 3: 7 is particularly preferable. Example 3 is modified to provide a volume ratio of the seed component and the core component in a ratio of 3: 7, wherein 30% of the constituents of the filament is formed of the seed component and 70% of the core component. The denier of PON was 114 and the elongation was 76%, and the extensible crimp of the twisted 70 denier yarn was about 23.4%, slightly higher than the result of Example 3 in a volume ratio of 2: 3.

All the bundles were allowed to stand for one day under conditions controlled to a temperature of 21 ° C. and a relative humidity of 65% and used for the experiment. The elongation of the yarn was measured one week after spinning. 50 yards of yarn were taken from the bobbin and elongation was measured using an Instron tensile tester. The length of the yarn, which was the sample between the clamps, was 25 cm (initial length), and the crosshead was pulled until the yarn was cut while the speed of the crosshead was 30 cm per minute. Elongation is the percentage of sample length divided by the initial length (25 cm) as the maximum load is increased.

미터가 되게 하였다. 리일의 회전수는 사의 데니어당 2840으로 하므로써 가장 근사한 회전수를 구할 수 있었다. 이렇게 하므로써 스케인의 최초의 길이가 9/16미터이고, 스케인 데니어가 5680인 스케인을 얻을 수 있었다. 스케인에 14.2g의 하중을 걸고 약 180℃의 강제 공기 순환식 오븐 내에 5분 동안 넣어둔 다음, 오븐에서 스케인을 꺼내어 하중이 걸려 있는 상태로 실온에서 1분간 방치한 후 스케인의 길이 L₂를 0.1cm정도의 가까운 거리에서 측정하였다. 다음에 14.2g의 하중을 650g의 하중으로 바꾸고 30초가 경과된 후에 스케인의 길이 L₃를 0.1cm정도의 가까운 거리에서 측정하였다. 따라서 권축도 %는

으로 정의된다. 권축성의 감소는 보빈 위에서 가연사를 고성할 때와 같이 처음에는 빠르게 진행되었다가 나중에는 서서히 진행된다. 본 발명에서의 고성 권축도는 가연사를 실온에서 2주일 동안 보빈 위에서 방치 시켰다가 측정한 것이다. 상대점도는 90%의 포름산을 사용하는 ASTM D 789-81로 측정하였으며, 절단된 필라멘트의 수는 팩키지 표면에 나타난 절단 필라멘트를 눈으로 보고 세어서 계산한 것이다.The crimp was measured as follows. In other words, Skele's main circumference has a tension of 2g or less

Meter. By setting the number of revolutions of the rail to 2840 per denier of the company, the closest number of revolutions was obtained. In this way, a scale with a length of 9/16 meters and a skein denier of 5680 was obtained. The load is 14.2g and placed in a forced air circulation oven at about 180 ° C for 5 minutes.Then, the scale is removed from the oven and left for 1 minute at room temperature under load. ₂ was measured at a close distance of about 0.1 cm. Next, after changing the load of 14.2g to the load of 650g, after 30 seconds, the length L ₃ of the skein was measured at a close distance of about 0.1 cm. Therefore the percent crimp

Is defined. Decrease in crimping occurs rapidly at first, then slowly, as in the case of smelting twisted yarns on bobbins. The solid crimp in the present invention is measured after leaving the false twisted yarn on bobbin for 2 weeks at room temperature. Relative viscosity was measured by ASTM D 789-81 using 90% formic acid, and the number of cut filaments was calculated by visually counting the cut filaments appearing on the package surface.

Claims (31)

A sheath-core filament spun at a spinning speed of at least 2200 MPM, wherein the polymer core component is surrounded by a nylon 66 seed component having a melt viscosity at 284 ° C. higher than the polymer core component. The filament according to claim 1, wherein the core component is nylon 66. The filament according to claim 2, wherein the relative viscosity of the seed component is at least 10 higher in relative viscosity units than the relative viscosity of the core component. The filament according to claim 3, wherein the relative viscosity of the seed component is at least 20 higher than that of the core component in relative viscosity units. The filament according to claim 2, wherein the seed component has a relative viscosity of at least 50. The filament according to claim 5, wherein the seed component has a relative viscosity of at least 60. The filament according to claim 2, wherein the volume ratio of the seed to the core component is 1: 1 or less. 8. The filament of claim 7, wherein the volume ratio of the seed to the core component is about 3: 7. The filament according to claim 2, wherein the elongation is 150% or less. The filament according to claim 2, wherein the elongation is 40% to 120%. A melt stream consisting of nylon 66 seed component and core component having a melt viscosity at 284 ° C. larger than the core component is extruded through capillary tube and cooled to form a filament, which is then wound at a spinning speed of at least 2200 MPM. Spinning method of seed-core filament yarn to be used. The spinning method according to claim 11, wherein the core component is nylon 66. 13. The spinning method according to claim 12, wherein the relative viscosity of the seed component is at least 10 higher in relative viscosity units than the relative viscosity of the core component. 13. The spinning method according to claim 12, wherein the relative viscosity of the seed component is at least 20 higher in relative viscosity units than the relative viscosity of the core component. 13. The spinning method according to claim 12, wherein the seed component has a relative viscosity of at least 50. 13. The spinning method according to claim 12, wherein the seed component has a relative viscosity of at least 60. The spinning method according to claim 11, wherein the volume ratio of the seed to the core component is 1: 1 or less. 18. The spinning method according to claim 17, wherein the volume ratio of the seed to the core component is 3: 7 or less. 13. The spinning method according to claim 12, wherein the elongation of the filament is 150% or less by selecting the spinning speed. 20. The spinning method according to claim 19, wherein the elongation of the filament is 40% to 120%. The spinning method according to claim 12, wherein the filaments are stretched and wound at a winding speed of 1.1 to 2 times the spinning speed. Nylon 66 seed component having a melt viscosity at 284 ° C. greater than the core component simultaneously draws and frictionally burns the sheath-core filament spun at a spinning speed of at least 2200 MPM surrounding the core component. . The method for producing a combustible yarn according to claim 22, wherein the core component is nylon 66. 24. The method according to claim 23, wherein the relative viscosity of the seed component is at least 10 higher in relative viscosity units than the relative viscosity of the core component. 24. The method according to claim 23, wherein the relative viscosity of the seed component is at least 20 higher in relative viscosity units than the relative viscosity of the core component. 24. The method of claim 23, wherein the seed component has a relative viscosity of at least 50. 24. The method according to claim 23, wherein the seed component has a relative viscosity of at least 60. 24. The method of claim 23, wherein the volume ratio of the seed to the core component is 1: 1 or less. 29. The method of claim 28, wherein the volume ratio of the seed to the core component is about 3: 7. 24. The method for producing a twisted yarn according to claim 23, wherein the elongation of the filament is 150% or less. 31. The method of claim 30, wherein the elongation of the filament is 40% to 120%.

Images