SYSTEM AND PROCESS FOR MOLDING OF PARTS MADE OF FIBER CEMENT

摘要

A system and a method for molding a part from fiber cement, or fibrocement, slurry are provided. The molding is preferably made by pressure injection of the slurry. The slurry includes cementitious material, additives, fibers and water. The fibers can include polypropylene, polyethylene, polyacrylic, cellulose, and/or asbestos fibers. First and second molding sections define, at least partially, a chamber. The second molding section has at least one evacuating channel. The system includes a slurry inlet communicating with the chamber, for inserting the slurry. A bladder covers the first molding section, the bladder being inflatable for compressing the slurry between the bladder and the second molding section. A filter covers the second molding section and allows water contained in the slurry to pass through while retaining the cementitious material and fibers within the chamber. A pressurized fluid inlet port communicates with at least one conduit for inflating the bladder.

主权项

1. A method for molding a part from a fiber cement slurry, the fiber cement slurry comprising cementitious material, additives, fibers and water, said method comprising the steps of:
a) providing a mold assembly including at least a first and second molding sections, the first molding section being covered with a bladder and the second molding section being covered with a permeable filter, the first and second molding sections defining, at least partially, a chamber for receiving the fiber cement slurry, the second molding section comprising at least one evacuating channel; b) inserting the fiber cement slurry in the chamber; c) inflating the bladder for compressing the fiber cement slurry between said bladder and the second molding section, thereby evacuating the water contained in the fiber cement slurry from the chamber through the filter and through the at least one evacuating channel while retaining the cementitious material and fibers within the chamber; d) deflating the bladder; e) removing the mold assembly, the method thereby providing a shaped body having sufficient green strength to be handled.