Method for forming coating film on internal surface of elongated tube and unit for forming the same
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United States of America Patent
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May 17, 2005
Grant Date -
Sep 25, 2003
app pub date -
Mar 20, 2003
filing date -
Mar 22, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for forming a coating film on an internal surface of an elongated tube, includes longitudinally holding the elongated tube, applying a coating solution to the internal surface of the elongated tube; and drying the coating solution while carrying out a heat process for sequentially heating the elongated tube by using a heat source. The heat process includes adjusting the descending rate of the heat source so that a through-hole in the elongated tube is clogged with the coating solution whose viscosity is reduced by heating of the heat source, and sucking the through-hole in the elongated tube from the lower side thereof so that a portion of the through-hole that is clogged with the coating solution moves downwards along the elongated tube.
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