Patent ID: 6547019
Filing Date: 2003-04-15
Classification: B29C,B29K,B29L,F01P

Abstract:
A reserve tank for engine coolant formed by blow molding, wherein a method of said blow molding comprises the steps of:forming a parison between halves of an open mold; blowing air into the parison to expand while pinching the parison between the mold halves; and forming a hollow product by cooling to harden the expanded parison pressed in cavities of the mold halves; wherein before pinching the parison between the mold halves, a thermoplastic film with a color which is different from the parison is so placed that the thermoplastic film covers at least one of the cavities; and and wherein when blowing the parison, the thermoplastic film placed over the cavity is pressed along with the parison and stuck thereto.