PURPOSE: To obtain a resin tube with uniform thickness by a method in which a resinous liquid in a cylinder chamber is sent under pressure to a nozzle by a cylinder shrinking in an interlocking manner with the movement of the resin supply nozzle in such a way as to supply the resin in a fixed amount all the time.
CONSTITUTION: When a resin supply nozzle 8 is sent forward by running a truck 5, a piston rod 12 moves in the shrinking direction through connecting levers 21 and 22 in an interlocking manner and the piston 11 moves to cause the inside of the cylinder 13 to contract. In this case, since back flow is interrupted by an one-way valve 14, the resin 23 is supplied through a discharge path 17, a supply hose 19, and a supply path 20 from the supply nozzle 8 into a cylindrical mold 1 in a fixed amount all the time. When a truck 5 goes back, the piston rod 12 is gradually extened and the resin 23 in the resin tank 16 is supplied to the cylinder chamber 13 by means of negative pressure actions inside the cylinder chamber 13 and also of pressurizing actions by a pump 15. A resin tube having uniform thickness over the whole length can thus be obtained.
NISHINO YOSHINORI
SONODA YOSHITERU
FUJI KINZOKU KOSAKU KK