Gas knife process for controlling hot-dip aluminum coatings

Details Gas knife process for controlling hot-dip aluminum coatings Gas knife process for controlling hot-dip aluminum coatings

1975-05-19

1976-10-26

Herbert, Jr., Thomas J.

Coating processes

With post-treatment of coating or coating material

Gas jet or blast mechanically treats coating

118 63, 427431, 427434R, 427436, B05D 304, B05D 312

Patent

active

039885178

ABSTRACT:
A gas knife process for controlling the thickness profile of hot-dip aluminum coatings, employs a hybrid gas knife design incorporating both a "curved-lip" with a "bow-tie" orifice. This design, in combination with very close knife to strip distance at the strip edges, was found to provide desirable coating profiles. Best results are obtained with knife deflections of 5.degree. to 30.degree. below the horizontal while utilizing orifice pressures of 15 to 70 mm of Hg at line speeds of 20 to 150 m/min.

REFERENCES:
patent: 3406656 (1968-10-01), Patterson
patent: 3607366 (1971-09-01), Kurokawa
patent: 3681118 (1972-08-01), Ohama et al.

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