Process for providing a fiber cement product
AssigneeEternit GmbH
InventorPhilippe Hellemans
Life of this patent
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Abstract
A process for providing a fiber cement product is provided the process comprising the steps of: —providing an uncured fiber cement product; —curing said uncured fiber cement product; —drying said cured fiber cement product to obtain a humidity of said cured fiber cement product being less than or equal to about 8% w; —abrasive blasting at least part of the surface of said dried fiber cement product.
Claims10
A process for providing a fiber cement product which is free of any visible effects of efflorescence, comprising a combination of the following steps in the following order:
- providing an uncured fiber cement product consisting essentially of fiber and cement;
- air curing said uncured fiber cement product under ambient conditions;
- air drying said cured fiber cement product after completion of curing, in a separate step and in a ventilated furnace at a temperature between about 70° C. and 105° C., to obtain a humidity of said cured fiber cement product being less than or equal to about 8% w;
- and
- upon completion of said air drying, directly abrasive blasting at least part of the surface of said dried fiber cement product,
- wherein said uncured fiber cement product is obtained using a Hatschek process and the abrasive blasting excludes sandblasting.
A process for providing a fiber cement product which is free of any visible effects of efflorescence, comprising a combination of the following steps in the following order:
- providing a fiber cement slurry comprising about 80 to 90% by weight cement, 1.5 to 5% by weight cellulose fibers and 1.5 to 5% by weight synthetic fibers;
- transforming the slurry into a green fiber cement sheet by a Hatschek process, prior to air curing;
- air curing said green fiber cement sheet under ambient conditions;
- air drying said cured fiber cement sheet after completion of curing, in a separate step and in a ventilated furnace at a temperature between about 70° C. and 105° C., to obtain a humidity of said cured fiber cement sheet being less than or equal to about 8% w;
- and
- upon completion of said air drying, directly abrasive blasting at least part of the surface of said dried fiber cement sheet,
- wherein the abrasive blasting excludes sandblasting.
Dependencies are inferred from the claim text.