Patent ID: 7105202

Claim:
A process for coating an inner wall surface of a thin tube with a resin, comprising the steps in the named order of: filling the tube having an inside diameter of 0.2 to 5 mm with a resin particulate dispersion containing resin particles and a solvent; positioning a heater at an upper end of the tube while the tube is held in an upright or slanting position with the dispersion held inside the tube by surface tension of the resin particulate dispersion so that the dispersion does not flow out the tube; while keeping this condition, heating the tube by moving the heater relative to the tube toward a lower end of the tube for vaporizing the solvent from the dispersion, while leaving the resin particles adhering to the whole inner wall surface of the tube, and thereby forming a layer of the resin particles adhering to the inner wall surface of the tube; further heating the tube for causing the resin particles to melt and coat the inner wall surface of the tube; and cooling the tube to solidify a resin layer coated on the inner wall surface of the tube, wherein said filling is carried out by introducing the resin particulate dispersion into the tube by suction with the lower end of the tube dipped in the resin particulate dispersion held in a vessel.