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We produce EVA foam sheet by one stage expansion in compression moulding.We would like to produce EPDM foam sheet by same method.Is it possible?
In one stage expansion method, we put EVA compound in the mould. Press is opened quickly after proper moulding time under proper curing/foaming temperature and the EVA foam sheet is expanded very quickly.
But in some factories, two stages process is used for EPDM foam manufacturing. In two stages method, EPDM compound is moulded to preform shape by a normal rubber compression press. Preform dimension is much less than final foam product. Then preform is put in a a very big mould in a low pressure hot press. In this method, expansion is done slowly in the big mould under temperature and low pressure. Some Where, expansion is done in hot air oven or autoclave too.
We are looking for one stage expansion.

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