Apparatus for pressure-forming and curing of polymer products

An apparatus for pressure-forming and curing of polymer products, said apparatus comprising:

• two moulds, each of said moulds being a semicylinder having a flat side and a curved surface;
• two spaced apart, parallel plates interlinking said two moulds such that the flat sides of the two moulds face each other, said parallel plates and said moulds forming a building core having a contoured outer surface, said contoured outer surface comprising the curved surfaces of said moulds and outer surfaces of said parallel plates, said building core being revolvable about a fulcrum pin having an axis of rotation so that material for a circular polymer product can be wound around said contoured outer surface of said building core;
• means for setting a separating distance between said moulds in a direction perpendicular to the axis of rotation of the fulcrum pin;
• and
• forming means comprising a girdling structure which circumferentially embraces said building core such that said girdling structure extends around the contoured outer surface of said building core, said girdling structure comprising at least two elements, at least one of said elements being radially displaceable.