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AssigneeHeberlein Fibertechnology, Inc.
InventorsGotthilf Bertsch, Erwin Schwarz
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A method of air jet texturing is described wherein the intensity of texturing is proposed to be increased in that an air flow exceeding Mach 2 is obtained by the design of the nozzle duct. The total opening angle of the nozzle duct (11) directly in front of the texturing zone is designed to be greater than the ideal Laval angle with an effective length which is preferably a multiple of the smallest diameter of the nozzle. This predominantly improves the quality of texturing, quite particularly at higher production rates. These can be increased into the range of 600 to 1000 m/min and higher. It has surprisingly been found that the novel nozzle core (10) can be designed so that it has all advantages of the novel invention and can be used as a substitute for prior art nozzle cores. The same applies to the complete texturing head as the novel invention can be used within the same geometric external dimensions, the same air pressure and the same quantity of air.
A method for the aerodynamic texturing of yarn with a texturing nozzle having a continuous yarn duct, at one end of which the yarn is supplied and at the other end is delivered as textured yarn, the method comprising the steps of supplying compressed air into a central portion of the yarn duct, accelerating the air to supersonic speed higher than Mach 2 in a widening acceleration duct portion of the yarn duct proximate said other end, wherein at a predetermined supply pressure of the compressed air higher than 4 bar, a substantially constant yarn tension is achieved for a given yarn quality and a production rate of 400 to 600 m/min.
A texturing nozzle for yarn comprising a continuous yarn duct with an outlet end having an acceleration duct proximate thereto, a compressed air supply inlet (P) in a central portion of the yarn duct, an inlet end to which yarn can be supplied, textured yarn being taken off at said outlet end, wherein the central portion and an inlet region of the acceleration duct is substantially cylindrical, and the compressed air supply inlet is angled in the direction of the outlet end and operating by a radial principle, an accelerating portion of the acceleration duct has a length greater than 11/1 times a diameter (d) at the beginning of the acceleration duct and a total opening angle greater than 10 degrees, and is sized to provide acceleration of the air to greater than approximately Mach 2.
Dependencies are inferred from the claim text.