Netting with a frame from thermoplastic polymer and method for its manufacture

摘要

A net is laid across the parting plane of a multi-part molding tool with cavities and then fixed in position. A thermoplastic plastic melt is injected into the tool and allowed to cool to form a frame which holds the net. When fixed across the parting plane the net extends outside the frame periphery and is held on the outside with clamps or cables. Additional tension is applied to the net by ribs in the tool which press the net into the tool cavities on tool closure. Net stretching is such that even when the frame shrinks during cooling tension is retained. Net is a woven or plastic net. The framed net may include an adjusting system, e.g. a screw mechanism. A seal extends around the parting plane and may project outside the latter. Independent claims are included for: (a) a framed flexible net, the frame being of thermoplastic; (b) a tool for manufacturing a framed net and comprising two or more tool parts with cavities having the shape of the frame and fed with thermoplastic plastic; and (c) equipment for manufacturing the framed net comprising the claimed tool and a net tensioning mechanism.