Patent ID: 8343290
Filing Date: 2013-01-01
Classification: B29B,B29C,B29K,B29L,C08G,C08L,Y02W

Abstract:
1. A method of making a rubber sheet from rubber-containing granules, the method comprising the steps of sequentially: coating the rubber granules with a binder; forming the coated rubber granules into a mat having a core layer with a low moisture level of less than 5% and a pair of outer surface layers; without substantially increasing the low moisture level in the core layer, setting in at least one of the outer layers a high moisture level of 10% to 50% by weight and thereby imparting to the mat an inhomogeneous moisture profile; hot-pressing the mat with the inhomogeneous moisture level with pressure and heat so as to vaporize moisture in the one outer layer and drive steam into the core layer; and curing the hot-pressed mat.