METHOD OF PRODUCING A MOULDED ARTICLE HAVING A HOLLOW RIM

摘要

A method of producing an injection moulded article (1) made of a polymeric material and having a hollow rim (2) being an integrated part thereof. The rim (2) is produced using a gas injection procedure. At least one moulding impression (4) producing a circumambient rim (2) of a moulding tool (3) is provided with at least one gate (6) for injection of a molten polymeric material (10), at least one gas duct (8) for gas injection, at least one gate (7) for discharge of excess of molten polymeric material (10) and/or at least one moving part (11) for controlled expansion of the moulding impression (4) to a pre-determined volume and at least one cavity (12) being coupled to and/or surrounding a gas duct (8). The cavity (12) constitutes a material reservoir for levelling of the discharge of the excess of molten polymeric material (10) and/or for levelling of the expansion of the moulding impression (4).