METHOD OF MANUFACTURING FUEL TANKS BY BLOW MOULDING

• Main Authors: BOUCAUX, Eric, KOSAKO, Seiji
• Format: Patent
• Language: English; French; German
• Published: 15.04.2020
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A method of manufacturing fuel tanks made of polymer material using a blow molding technique, the method including: offering up at least one sheet form extrudate between two opposing cavities of an open mold with an impression that corresponds to a shape of a tank that is to manufactured; then bringing the two cavities together until the mold is closed; as the two cavities are being moved closer together and before the extrudate comes into contact with one of them, injecting a first fluid between the extrudate and at least one cavity; injecting a second fluid on the opposite side of the extrudate from each cavity, to press it firmly against the wall of the cavity; removing the first fluid present between the cavity and the extrudate before end of injection of the second fluid.