Chemistry: electrical and wave energy – Processes and products
Patent
1987-11-09
1989-11-21
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
204 24, C25D 108
Patent
active
048820156
ABSTRACT:
Friction spinning elements, in the form of drums or discs comprising perforated friction spinning bodies are subject to the requirement that, on the one hand, the entry section of each hole should be as small as possible, in order to prevent penetration of fibers wherever possible. On the other hand, the form of each hole in the longitudinal direction, as viewed in the airflow direction, should be as favorable as possible aerodynamically so that a hole acting as a nozzle generates the lowest possible air resistance. Further, the form of the hole viewed along its length should be selected such that dirt and dust or other contaminants which may penetrate into the hole do not remain caught therein. It has been established that in galvanically formed perforated bodies there is a tendency for each hole to become larger in section with increasing wall thickness, thus giving each hole a diffusor-like longitudinal section as viewed in the airflow direction. This advantage can be exploited in the use of the perforated body in a friction spinning process by arranging the fiber receiving surface of the body to be fabricated against the mold during the galvanic forming step whereby the narrowest section of the hole forms an opening edge at the fiber receiving surface.
REFERENCES:
patent: 3167489 (1965-01-01), Hadjian
patent: 3332858 (1967-07-01), Bittinger
"Metalloberflache", 19th publication year, vol. 12, Dec. 1965, pp. 369 to 372, Munich, West Germany, Article of H. J. Heinrich entitled Galvanoplastische Siebherstellung.
"Metalloberflache", 20th publication year, vol. 8, Aug. 1966, pp. 333 to 336, Article of H. J. Heinrich, entitled Verfahren zur Beeinflussung der Lochprofile bei der Galvanoplastischen Siebherstellung.
Kleeman Werner W.
Rieter Machine Works Ltd.
Tufariello T. M.
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