Method and apparatus for the moulding of articles in polyurethane.

摘要

A method for the production of articles moulded in polyurethane, in particular in compact and semi-compact polyurethane. According to the invention, the polyurethane mixture is compressed directly in the mould cavity (13) from a moment (Tx) chosen in the time interval between the end of the feeding phase of the mixture into the mould (11) and the instant in which a filament may be formed in the polymerization process of the polyurethane material (24), during which the polyurethane material (24) is in a transitional condition between liquid and solid states. In the above way, moulded articles with well-defined markings and free from defects due to eventual surface air-bubbles are obtained.