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Method for the preparation of a foamed article of a polyolefin resin

Image Number 4 for United States Patent #4674976.

A sheet of a cross-linkable and foamable polyolefin resin is thermally treated on an endless conveyor belt formed of a plain weave wire net. A plurality of parallel, spaced apart rolls are disposed in a direction perpendicular to the direction in which the conveyor belt runs for supporting engagement and rolling contact with the conveyor belt to maintain the flatness of the conveyor belt. The belt is supported to prevent lateral and vertical displacement.

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