Method for reclaiming cured rubber scraps
AssigneePiovanelli Macchinari e Impianti S.p.A.
InventorTemistocle Boccoli
Life of this patent
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Abstract
A method for reclaiming rubber in which the scraps to be reclaimed are treated in an autoclave at a temperature which is always below the temperature at which the scraps had been cured, with continuous agitation and under the pressure of a fluid (such as air) fed to the autoclave at the ambient air temperature. The processing time is a function of the other parameters and can easily be determined experimentally depending upon the nature of the material to be reclaimed and the plasticity to be obtained.
Claims6
A method of reclaiming rubber, consisting essentially of the combination of steps of heating scraps of cured rubber which have been freed of non-rubbery components, the compositions of the scraps being identical or compatible and the size of the scraps being substantially uniform, at a temperature below the curing temperature of said scraps in an autoclave which is heated externally while subjecting said scraps to agitation to effect even mixing and constant movement of said scraps, said heating and agitating of the scraps being undertaken in the presence of water in the form of steam equal to a percentage by weight of the scraps which percentage may vary from 5 to 10% wherein the exact amount of water relative to said scraps is controlled to determine the extent to which the scraps become plastic and in the presence of air, the volume of which is sufficient to effect a pressure within the autoclave of between 10 and 30 atmospheres, for a period of time sufficient to cause the contents of the autoclave to reach a temperature of about 110.degree. C and continuing said treatment for a period of time of at least 15 minutes which is a period of time sufficient to plasticize said scraps.
Dependencies are inferred from the claim text.