Patent DE-102009019500-A1 (DE)
Title: Producing thread having individual filaments, by guiding each of individual filaments at distance from each other, and coating each individual filament with flowable resin having solvent and crosslinked under effect of physical variable
Inventor: KNAPPE FAISAL H-J
IPC: D02G3/04
Filed: 2009-05-04
Abstract: The method for producing a thread (2'), which includes individual filaments (45, 46, 47), comprises guiding each of the individual filaments at a distance from each other, coating each of the individual filaments with a flowable resin (14) containing a solvent and crosslinked under the effect of a physical variable and/or a chemical substance, and subsequently compacting the coated individual filaments, so that a composite is formed which consists of the individual filaments and the resin cohesively surrounding the filaments and which is free of gas pockets. The method for producing a thread (2'), which includes individual filaments (45, 46, 47), comprises guiding each of the individual filaments at a distance from each other, coating each of the individual filaments with a flowable resin (14) containing a solvent and crosslinked under the effect of a physical variable and/or a chemical substance, and subsequently compacting the coated individual filaments, so that a composite is formed which consists of the individual filaments and the resin cohesively surrounding the filaments and which is free of gas pockets. The solvent contained in the resin is expelled from the composite during a drying process. The composite present as a monofilament thread is wound in an uncrosslinked state of the resin. All of the individual filaments are unidirectionally aligned during all the preceding process steps. The individual filaments are coated in a bath of the resin by immersion, where the individual filaments are continuously pulled through the bath. The compacting step takes place in a nozzle, by which the coated individual filaments are pulled, where an inner space of the nozzle is in truncated cone form, so that the surplus resin from an opening cross-section of the nozzle is held back into the inner space of the nozzle during discharging the compacted individual filaments. The individual filaments comprise one of the filament types such as para-aramide filament, carbon filament, glass filament, basalt filament and steel filament. The individual filaments have a diameter of 6-10 mu m, the compacted composite has a diameter of 250 mu m to 1.0 mm and/or the dried monofilament thread has a diameter of 220 mu m to 0.9 mm. The monofilament thread is made of a number of individual filaments with intervals of 200-1000. The resin contains water portion 30-40% before drying. The solvent is expelled from the coated and compacted composite using convection with positively promoted air and/or infrared radiation and/or microwave radiation, where the temperature is kept at 80-100[deg] C during drying process. The individual filaments are heated at 60-70[deg] C before coating with the resin. A first type of individual filaments is present in an inner zone (42) of the compacted composite of the individual filaments, a second type of the individual filaments is radially outwardly present in a first outer zone (43) subsequent to the inner zone and a third type of the individual filaments is optionally radially outwardly present in a second outer zone (44) as in the first outer zone, where the second outer zone is subsequent to the first outer zone and the boundaries between the zones are formed by cylindrical surfaces, which are coaxially directed to a thread longitudinal axis. The individual filaments are washed in a bath of a cleaning liquid before coating and/or are provided with a coating conveying the resin flow, where the individual filaments are separately guided during cleaning. Independent claims are included for: (1) a device for producing a thread; and (2) a thread.