Moulding of articles
First Claim
1. A method of producing molded construction products from a liquid-setting mixture of fine and coarse particulate materials comprising the steps of mixing the dry constituent materials, said materials including a proportion of fine particles sufficient to substantially surround all of the coarse particles but not including fibrous reinforcing materials, introducing said mixture into a mold, vibrating at least a part of said mold to effect compaction of said mixture in said mold to an extent that said fine particles substantially fill the interstices between said coarse particles and that any vertical surface of said product will stand and be self-sustaining upon being exposed without mold support, removing at least a part of the mold from contact with the thus compacted product, thereby exposing at least one vertical surface of the compacted product, spraying the product at a surface unsupported by said mold with a predetermined quantity of a setting liquid, said quantity being sufficient to wet all of the compacted constituents so as to initiate a chemical setting reaction but insufficient to completely saturate the compacted product and to cause the associated effect of structural collapse of the compacted product in the region of said exposed surface, and allowing said product to set.
2 Assignments
0 Petitions
Accused Products
Abstract
Construction products are moulded by mixing the dry constituents, including a proportion of fine particulate material, feeding (1, 2) the mixture into a mould (5), compacting the mixture, removing part (6) of the mould (5), lightly spraying (9) an exposed upstanding surface of the product with setting liquid, removing the product from the mould (5) and allowing it to set. Sufficient fine particulate material to surround the coarse particles and compaction, using vibration (7) of the mould (5) and compression of the mixture, to cause the fine particles to fill the interstices between the coarse particles, provide sufficient support of the exposed surface to prevent collapse or erosion thereof during wetting even though no fibre reinforcement is included in the mixture. Sufficient liquid to wet the product but not to saturate it is applied by the spray (8, 9).
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Citations
13 Claims
- 1. A method of producing molded construction products from a liquid-setting mixture of fine and coarse particulate materials comprising the steps of mixing the dry constituent materials, said materials including a proportion of fine particles sufficient to substantially surround all of the coarse particles but not including fibrous reinforcing materials, introducing said mixture into a mold, vibrating at least a part of said mold to effect compaction of said mixture in said mold to an extent that said fine particles substantially fill the interstices between said coarse particles and that any vertical surface of said product will stand and be self-sustaining upon being exposed without mold support, removing at least a part of the mold from contact with the thus compacted product, thereby exposing at least one vertical surface of the compacted product, spraying the product at a surface unsupported by said mold with a predetermined quantity of a setting liquid, said quantity being sufficient to wet all of the compacted constituents so as to initiate a chemical setting reaction but insufficient to completely saturate the compacted product and to cause the associated effect of structural collapse of the compacted product in the region of said exposed surface, and allowing said product to set.
Specification
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- Resources
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Current AssigneeDryflow Limited
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Original AssigneeC G Bevan Associates Limited
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InventorsBevan, Christopher G.
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Primary Examiner(s)NOT, DEFINED
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Application NumberUS06/302,472Time in Patent Office1,376 DaysField of Search264/71, 264/333, 264/82, 264/123US Class Current264/71CPC Class CodesB28B 13/028 Deflecting the flow of the ...B28B 7/465 Applying setting liquid to ...
