Patent ID: 6444065
Filing Date: 2002-09-03
Classification: B29C,B60B,Y10T

Abstract:
A process for producing rotatable plastic rollers having a roller shaft, an outer running roller layer, and an inner running roller layer, the process steps comprising:producing the inner running roller layer by placing thermoplastic material between the outer running roller and the roller shaft; upon cooling, the thermoplastic material of the inner running roller layer shrinks and bonds to the shaft forming a gap between the inner running roller layer and the outer running roller layer so that the outer running roller layer is rotationally moveable around the inner running roller layer; both the inner running roller layer and the outer running roller layer being produced in one mold by a multi-component injection-molding by initially placing the roller shaft in the mold process; moving together two cylindrical slides arranged opposite each other around the roller shaft to thereby define an outer cavity in the mold into which thermoplastic material is injected to form the outer running roller layer; and subsequently moving the cylindrical slides apart to thereby define an inner cavity in the mold into which the thermoplastic material is injected to form the inner running roller layer.