Manufacture of insulating products
AssigneeNewalls Insulation Company Limited
InventorRobert Graham
Life of this patent
Estimating the term…
Abstract
A method of manufacturing sheet form insulation products from an aqueous slurry containing calcium silicate comprises the steps of pumping the slurry into a closed mould cavity in a platen filter press, at least one wall of the mould cavity being foraminous to an extent sufficient to allow the escape substantially only of fluid, stopping the pumping at a predetermined level of back pressure in the mould cavity, followed by closing the press to reduce at least one dimension of the mould cavity a prechosen amount.
Claims4
A method, of manufacturing sheet from insulation products from an aqueous slurry containing calcium silicate and fibers, utilizing a platen filter press having a mold cavity defined by a mold and a movable platen constituted by a plurality of platen portions which form a single unitary pressing surface, said platen portions being adjustable with respect to one another so as to apply pressure evenly upon the slurry in the mold cavity, said mold being foraminous to an extent sufficient to allow the escape substantially only of liquid of the slurry, said method comprising the steps of:
- (i) pumping said slurry into said mold cavity at a prechosen pressure until the back pressure exerted by the deposition of solids of the slurry in the mold cavity balances said prechosen pressure to terminate the pumping,
- (ii) thereafter moving said platen relative to said mold to press the slurry in the mold and reduce the slurry in at least one dimension by a prechosen amount.
Dependencies are inferred from the claim text.