| 摘要 |
A method of forming a blow moulded container in the form of a tub or wide-mouth container, comprising the steps of: providing an injection moulded substantially planar perform 4 composed of thermoplastic material; heating the preform; and stretch blow moulding the heated preform within a mould cavity 14 to form a tub having a bottom wall and an annular sidewall having an upper edge 8a, 10b, the tub comprising biaxially oriented thermoplastic material in the annular sidewall and at least an outer portion of the bottom wall, the stretch blow moulding step using at least one stretch rod 12 to engage an inner side of the preform and axially to stretch at least a part of the preform prior to blowing a pressurized gas against the inner side which urges the opposite side of the preform radially outwardly against the mould. A plurality of mutually spaced stretch rods may be provided. The upper edge of the container is preferably adapted to engage a lid. Prior to the stretch blow moulding step, the mould cavity may be pre-pressurised such as to form a counter pressure on the preform as it is stretched causing at least one region to bow radially inwardly. The method may include an in-mould labeling step. A blow moulded container and apparatus for forming a blow moulded container are also provided. |
