an improved , economical , high speed method for attaching a fibrous material to a plastic substrate involves positioning a fibrous material over a surface of a plastic substrate , directing a stream of heated air through the fibrous material and at the surface of the plastic substrate to melt the surface of the plastic substrate , compressing the fibrous material against the melted surface of the plastic substrate , and allowing the melted surface of the plastic substrate to cool and resolidify , whereby fibers of the fibrous material become embedded in the resolidified plastic .