Claims
- 1. A method for intermittently applying a liquid to a moving threadline comprising: supplying a liquid in a metered stream to a continuously vibrating atomizing surface of an active horn of an ultrasonic vibrator, said liquid having a threshold level of vibration amplitude for atomizing said liquid; moving the threadline in a path in close proximity to said atomizing surface; and intermittently atomizing and propelling the liquid onto the yarn by using bilevel excitation of the horn to vary the amplitude of vibration of said continuously vibrating atomizing surface above and below said threshold level thereby adding liquid to said threadline intermittently to produce liquid treated and untreated regions along the threadline.
- 2. The method as defined in claim 1, said amplitude being varied at the rate of from about 12 to about 500 Hz, said threadline moving at speeds up to 2000 yards per minute.
- 3. The method of claim 1, wherein varying the amplitude of vibration of said surface is periodic.
- 4. The method of claim 1, wherein varying the amplitude of vibration of said surface is random.
- 5. The method of claim 1, wherein varying the amplitude of vibration of said surface is in a programmed manner.
- 6. The method of claim 1, wherein at least two ultrasonic vibrators are employed closely spaced in series along the moving threadline.
Parent Case Info
This application is a continuation, of application Ser. No. 631,747 filed July 17, 1984.
US Referenced Citations (4)
Continuations (1)
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