TH26536A - The processes and equipment for producing synthetic yarns or fibers from polymers, especially polyamides, polyesters, or polypropylene. - Google Patents

Abstract

Fabrication is a process for producing synthetic yarns or fibers that have been completely decomposed from polymers by melt spinning microfibers that have been cooled at least to their solidification temperature. This is followed by spinning with small spinning machines, and then, for the purpose of stretching, they are heated to a temperature above the freezing point and simultaneously air-blown to achieve the desired tensile strength. These microfibers have a specific density < 1.0 dtex, are passed in a straight line without being bound through the heating area, and are then air-blown in an opposite flow. This results in perfectly shaped, synthetic microfibers with a high relative tensile strength and a low heating area. The resulting synthetic yarn has low relative elongation and is ready for immediate use. Due to its fineness, it is possible to produce very fine and flexible silk-like fabrics without any post-processing.

Claims (7)

1. The method of producing synthetic yarns or fibers from polymers, especially polyamides, polyesters, or polypropylene, involves molten spinning of microfibers. These microfibers, drawn at a specific pulling speed, are cooled after the spinning nozzle in a cooling zone to at least a solidification temperature. Subsequently, for the purpose of stretching, they are heated in a heating zone to a temperature exceeding the solidification temperature. Simultaneously, to increase abrasion resistance or produce the desired yield strength, they are blown through a gaseous medium (air). Specifically, microfibers with a single titer <1.0 dtex are passed in a straight, unbound path through the heating zone. To complete stretching, they are blown out by a gaseous medium in a symmetrical stream, and the microfibers are drawn through the heating zone at pulling speeds greater than 3500 m/min to 8000 m/min. 2. The method under Claim 1, which specifies that microfibers with a single titer of 0.4 dtex to 0.8 dtex are treated. 3. The method under claim 1 or 2, which specifies that the microfibers are heated in a heating zone of 150 to 250°C, preferably 220°C. 4. A method pursuant to one of claims 1 through 3, which is characterized by the microfibers being drawn through a heating zone at a drawing speed of 4500 m/min to 5500 m/min. 5. A method pursuant to one of claims 1 through 4, which specifies that the treated microfibers are bundled after the heating zone prior to winding. 6. The installation of equipment to carry out the method for the production of yarns or synthetic fibers of polymers, especially polyamides, polyesters or polypropylene, by melt winding of microfibers according to one of claims 1 through 5, which has at least one winding nozzle, a shaft with an air blower as a cooling zone, a shaft with a heating zone, and a gas medium supply device, a preparation device, rollers and winding devices which are characterized in that the gas medium supply device is made up as an air blower (9), an air blower nozzle which creates an opposing current on the outlet side of the heating shaft (5). 7. The installation of the equipment according to claim 6, which specifies that the heating shaft (5) is provided in the thread drawing direction 0.8 m to 1.2 m below the spinning nozzle (3) and the length of the shaft is 1 m to 1.5 m, preferably 1.2 m.