EP0372014A1 - Process and device for manufacturing highly oriented amorphous polyester filament yarns. - Google Patents
Process and device for manufacturing highly oriented amorphous polyester filament yarns.Info
- Publication number
- EP0372014A1 EP0372014A1 EP89902220A EP89902220A EP0372014A1 EP 0372014 A1 EP0372014 A1 EP 0372014A1 EP 89902220 A EP89902220 A EP 89902220A EP 89902220 A EP89902220 A EP 89902220A EP 0372014 A1 EP0372014 A1 EP 0372014A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cooling
- roller
- contact surface
- thread
- spinneret
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
- D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
Definitions
- the invention relates to a method for producing highly oriented, amorphous polyester filament threads by melt spinning at take-off speeds> 4000 m / min and to an apparatus for carrying out the method.
- EP-A-0 089 819 describes shock cooling using water.
- a polyethylene terephthalate filament thread is quenched at least 5000 m / min in a water bath. The resulting thread shows at high
- Orientation has only a low crystallinity, demonstrated by a cooking shrinkage of at least 45% and at most 68.5%.
- cooling in water has serious disadvantages. First the thread is braked in a water bath, which results in high tensions. Problems with splash water and the application of a spin finish to the wet thread occur. When water cooling is used, the entrained water adhering to the surface increases with the number of filaments, and with it the spray water.
- EP-A-0 244 216 describes a polyester filament yarn which is spun at more than 5000 m / min in an overpressure chamber, at the outlet of which a narrow tube is attached, the venturi effect causing shock cooling.
- air cooling As the number of filaments increases, uniform cooling of the bundle of filaments in the cooling tube (Venturi) is no longer guaranteed.
- shock cooling with air means that no defined thread speed is possible in the area below the spinneret, especially where the molten material is most sensitive.
- the object of the invention is to provide a method for flash cooling a rapidly spun polyethylene terephthalate filament thread, which ensures a defined thread speed in the area between the spinneret and the cooling element.
- the solution to the problem lies in a method which is characterized in that the melt-spun filament threads are cooled by means of a circumferential contact surface, then spin-prepared and wound up.
- a circumferential contact surface has the advantage that work can be carried out under defined conditions without a liquid or gaseous medium. Regardless of this, the cooling rate can be determined by determining the distance of the cooling surface from the spinneret and the wrap angle of the thread on the cooling surface.
- a variety of yarn properties can be achieved by varying the two parameters alone.
- the contact times of the filament threads on the contact surface between 1 ⁇ 10 -3 and 1 ⁇ 10 -2 s, in particular 2 ⁇ 10 -3 - 1 ⁇ 10 -2 s, defined at a peripheral speed range of Contact area between 800 to 2400 m / min, in particular between 1600 to 2400 m / min.
- the contact length or the wrap angle of the filament thread can also be calculated from the time.
- the polyester thread produced by the process surprisingly has an undeformed, circular cross section without adhesions.
- a peripheral contact surface has proven to be suitable as a cooling element as a device for carrying out the method.
- a rotating contact surface has the advantage that a larger number of individual filaments can be cooled than is possible with known shock cooling processes. So it is easily possible to cool 30 and more filaments at the same time.
- the desired properties of the shrinking yarn (40-70% KS) can be adjusted in a particularly simple manner by varying the distance from the spinneret and the speed of rotation of the contact surface.
- the contact surface is designed as a cooling roller.
- the cooling roller is preferably a hollow body made of a good heat-conducting material and can be provided with additional connections for a heat transport medium or coolant. Such a roller ensures almost any heat dissipation of the polyester filament threads.
- a cooling belt the thickness of which depends on the bending capacity of the belt, is also suitable for the shock cooling of polyester filament threads.
- the contact surface expediently consists of a highly thermally conductive material, preferably a metal or an alloy. Copper, aluminum and their alloys are particularly suitable.
- the thickness of the metal layer is 2-100 mm, preferably 10-80 mm, in particular 40-60 mm.
- the distance of the cooling whale ze from the spinneret is 250-1500 mm, depending on the filament and total titer.
- Fig. 1 shows a schematic representation of the inventive
- FIG. 2 shows a view rotated by 90 ° according to FIG. 1;
- FIG. 3 shows a schematic illustration of a cooling belt
- 1, 1 denotes a spinneret.
- a bundle of polyester threads 2 emerges from the spinneret, the edge threads of which are denoted by 2 ′ or 2 ′′.
- a cooling roller 3 is provided between a deflection roller 4 and the spinneret 1.
- a resulting total thread 5 runs over a convergence point 6, where a spin finish is applied in a known manner.
- An additional swirling device 7 can be provided in front of a winder 8.
- FIG. 2 the arrangement shown in FIG. 1 is shown rotated by 90 °.
- connections 11 for a heat transport medium are specified.
- the course of the individual filaments up to the point of convergence 6 should be shown clearly from the illustration.
- the number of filament threads 2 is largely uncritical.
- a cooling belt 10 is shown, which is guided over rollers 9, 9 'and 9''and at least one of these rollers is driven by a motor, not shown.
- the filament thread bundle 2 meets the cooling belt 10 in the area of the roll 9 and leaves the cooling belt 10 in the area of the roll 9 'as a total thread 5 in the direction of the winder 8, not shown.
- a polyester filament bundle 2 emerging from the spinneret 1 hits the surface of the cooling roller 3, where it undergoes shock cooling while in contact with the roller surface.
- the cooling roller rotates at a peripheral speed of 1600 to 2400 m / min.
- the thread is fed via the deflection roller 4 and via the convergence point 6 to the winder 8 at a winding speed of at least 4000 m / min. Any stretching is determined by the difference between the winder speed and that of the cooling roll 3.
- the effect of the cooling roller can be enhanced by heat dissipation using a coolant.
- a standard polyester polymer with an intrinsic viscosity of 0.75 dl / g was galettlos with a constant winding speed of 5000 m / min to the two titers dtex 67 f 12 and 200 f 30 (nom. 55 dtex f 12 and 167 f 30) spun.
- the boiling shrinkage (KS) is given.
- the boiling shrinkage was determined by measuring the length before and after heat treatment in water.
- CKS measurement individual thread 50 cm long (unshrunk); at 98 ° C ⁇ 1 ° C in water for 2.5 minutes; Average of 3 measurements].
- the value of the shrinkage can be viewed as a measure of the crystallinity, verified by measuring the density of the threads.
- the optimal distance between spinneret and roller was determined for the respective spinning titer and its desired properties.
- the spinning result can be influenced by the distance between the spinneret / roller, the peripheral speed of the roller and the contact length of the thread / roller (corresponds to the cooling time).
- the cooking shrinkage is mainly influenced by the distance between the spinneret and the roller, while the orientation shows no clear tendency.
- Table 1 It can be seen from Table 1 that, as the distance between the KS increases, it initially drops slightly, when a limit value is reached, in the described case about 55-60 cm, suddenly drops very sharply.
- the contact and thus the cooling time can be varied through the variable wrap angle of the thread on the roller circumference. This parameter also essentially influences the KS of the spun yarns. If the cooling time is shortened, i.e. the contact length, the same dependencies on the distance between the spinneret and roller tend to be shown in Table 2, only at a lower level.
- the orientation of the spun thread can be set within certain limits via the roll speed.
- Table 3 shows, the cooking shrinkage increases at the same time as the speed increases, strongly below 2000 m / min, and only above Slight, with opposite tendency of orientation (birefringence).
- Winding speed 5000 m / min
- a particular advantage of the method according to the invention is seen in the fact that, in contrast to the known cooling methods with water or air, the yarn properties can be influenced in a targeted manner.
- the method according to the invention works more economically, since neither a system for cooling air and its complex operation, nor precautions for occurring contamination by splash water have to be taken in wet operation.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Artificial Filaments (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
Selon un procédé de fabrication de fils (2) à filaments de polyester amorphes à orientation haute et à filage rapide, le refroidissement par choc thermique se fait au moyen d'une surface rotative de refroidissement formée, dans un dispositif préférentiel, par la surface de contact d'un cylindre de refroidissement (3). On peut obtenir des fils à filaments ayant un rétrécissement voulu à l'ébullition jusqu'à 70% et une biréfringence DELTAn > 0,08 en modifiant la durée du contact entre les fils à filaments (2) et le cylindre de refroidissement (3) et/ou l'écart entre la filière (1) et le cylindre de refroidissement (3).According to a process for manufacturing yarns (2) with high orientation and fast spinning amorphous polyester filaments, the cooling by thermal shock takes place by means of a rotating cooling surface formed, in a preferred device, by the surface of contact of a cooling cylinder (3). Filament yarns having a desired boiling shrinkage of up to 70% and a birefringence DELTAn > 0.08 can be obtained by modifying the contact time between the filament yarns (2) and the cooling cylinder (3) and/or the gap between the die (1) and the cooling cylinder (3).
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH72488 | 1988-02-26 | ||
CH724/88 | 1988-02-26 | ||
PCT/CH1989/000032 WO1989008159A1 (en) | 1988-02-26 | 1989-02-20 | Process and device for manufacturing highly oriented amorphous polyester filament yarns |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0372014A1 true EP0372014A1 (en) | 1990-06-13 |
EP0372014B1 EP0372014B1 (en) | 1994-04-20 |
Family
ID=4193703
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89902220A Expired - Lifetime EP0372014B1 (en) | 1988-02-26 | 1989-02-20 | Process and device for manufacturing highly oriented amorphous polyester filament yarns |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0372014B1 (en) |
CA (1) | CA1332263C (en) |
DE (1) | DE58907506D1 (en) |
ES (1) | ES2016875A6 (en) |
WO (1) | WO1989008159A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0423278B2 (en) * | 1989-05-01 | 1998-04-15 | Rhone-Poulenc Viscosuisse Sa | Process for the production of fine monofilaments |
EP0408994A1 (en) * | 1989-07-10 | 1991-01-23 | Rhône-Poulenc Viscosuisse SA | Process for the preparation of flatyarn |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4425293A (en) * | 1982-03-18 | 1984-01-10 | E. I. Du Pont De Nemours And Company | Preparation of amorphous ultra-high-speed-spun polyethylene terephthalate yarn for texturing |
ES2019285B3 (en) * | 1985-11-25 | 1991-06-16 | Schweizerische Viscose | METHOD AND DEVICE FOR BRAIDING POLYESTER THREADS |
US4687610A (en) * | 1986-04-30 | 1987-08-18 | E. I. Du Pont De Neumours And Company | Low crystallinity polyester yarn produced at ultra high spinning speeds |
DE3623748A1 (en) * | 1986-07-14 | 1988-02-18 | Groebe Anneliese Dr | High speed spun polyethylene terephthalate filaments having a novel property profile, production thereof and use thereof |
-
1989
- 1989-02-20 WO PCT/CH1989/000032 patent/WO1989008159A1/en active IP Right Grant
- 1989-02-20 EP EP89902220A patent/EP0372014B1/en not_active Expired - Lifetime
- 1989-02-20 DE DE58907506T patent/DE58907506D1/en not_active Expired - Fee Related
- 1989-02-22 ES ES8900641A patent/ES2016875A6/en not_active Expired - Lifetime
- 1989-02-23 CA CA 591849 patent/CA1332263C/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO8908159A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE58907506D1 (en) | 1994-05-26 |
CA1332263C (en) | 1994-10-11 |
ES2016875A6 (en) | 1990-12-01 |
WO1989008159A1 (en) | 1989-09-08 |
EP0372014B1 (en) | 1994-04-20 |
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