B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
25/103
B28B 7/40 (2006.01) B28B 3/02 (2006.01) B28B 7/46 (2006.01)
Patent
CA 1315959
A B S T R A C T. "Pressing of concrete bodies and a filter fabric for use therein." The invention is concerned with pressing wet concrete between a ram and a mould to compact the concrete and express water from it so as to produce a moulded slab. A layer of filter material is provided between at least one of the ram and the base of the mould on the one hand and the concrete which is being compacted on the other hand and the filter material is secured by a discontinuous coat of adhesive applied over a sufficient area of the filter material to secure adhesion of the filter material to the ram and/or base of the mould. The discontinuous adhesive coating is preferably provided as a pattern of particles which covers substantially the entire area of the face of the filter which will contact the face of the ram or the base of the mould and in the preferred method, the adhesive is present over between 2% and 15% of the total surface area of the filter material. It has been found that by using filter material which is secured in place by a discontinuous coat of adhesive that it is possible to use the process to manufacture relatively long runs of slabs without the filter material becoming "blinded" by concrete and other fines.
586938
Johnson Ernest Peter
P. G. Lawton (industrial Services) Limited
LandOfFree
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