Process for producing rubber sheets, rubber mats or similar rubber products from rubber granules
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United States of America Patent
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Jan 1, 2013
Grant Date -
Feb 3, 2011
app pub date -
Aug 27, 2008
filing date -
Aug 27, 2007
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Abstract
A rubber sheet is made from rubber-containing granules by first coating the rubber granules with a binder, then 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, and then, 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. The mat with the inhomogeneous moisture level is then hot-pressed with pressure and heat so as to vaporize moisture in the one outer layer and drive steam into the core layer, and the hot-pressed mat is cured.
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