Method for coating the inner surface of metal pipes

Details Method for coating the inner surface of metal pipes Method for coating the inner surface of metal pipes

1973-10-04

1976-08-10

Smith, Ronald H.

Coating processes

Solid particles or fibers applied

Interior or hollow article coating

118306, 118309, 118317, 118408, 118DIG10, 427181, 427195, 427231, 427232, 427233, 427234, 427238, 427239, 427318, 427350, B05D 722, B05D 302

Patent

active

039743063

ABSTRACT:
A method for coating the inner surface of a metal pipe having an inner diameter of about 1 to 15 cm, which comprises feeding from one end of said metal pipe dry particles of a coating composition into the interior of the metal pipe preheated at a temperature of from a softening point of said coating composition to below a melting point thereof, sucking air at the same time from the other end of the metal pipe so as to form an air stream carrying the particles and flowing in the interior of the pipe at a flow rate of about 4 to 20 m/sec and to allow the particles to deposit on the inner surface of the pipe, and fusing the deposited particles at a reduced pressure of 10 to about 100 mm Hg to form a continuous film on the inner surface of the pipe.

REFERENCES:
patent: 3074808 (1963-01-01), Harrison
patent: 3207618 (1965-09-01), De Hart
patent: 3484276 (1969-12-01), Burggraaf et al.
patent: 3814616 (1974-06-01), Kondo et al.
patent: 3850660 (1974-11-01), Inamura et al.

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