PRODUCTION OF PLASTIC TANK HAVING LIQUID IMPERMEABILITY

摘要

PURPOSE:To impart impermeability and flexibility to a barrier layer to be formed by coating and to obviate the generation of cracking by specifying the resin to form the barrier layer on the inside surface of a plastic tank. CONSTITUTION:Oxygen converted to plasma is introduced through holes 10 connected to the bottom ends of respective plasma generating furnace 8 facing the inside of a chamber 2. The gaseous pressure in the chamber 2 is evacuated to a vacuum and the inside surface of the tank W is subjected to a plasma treatment. Molten liquid nylon soluble in alcohol is coated on the inside surface of the tank W to form a nylon layer. The tank W is conducted to a drying furnace and is dried by heating to evaporate the alcohol in the nylon layer, by which the barrier layer made of the liquid impermeable nylon is formed. The resultant barrier layer is provided with both the impermeability and flexibility and does not crack even if exerted with impact.