Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Extrusion molding
Patent
1982-11-26
1985-07-16
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Extrusion molding
523099, 5230912, 5230917, 52612, 264 39, 264 406, 264 455, 264338, 425127, 425144, 425817R, B29D 2704
Patent
active
045295620
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
This invention relates to the production of blocks bricks and tiles such as are used in the construction industry, and in particular to such blocks or the like having good thermal insulation properties by virtue of thermally insulating material being incorporated therein.
STATE OF THE ART
Building blocks and the like of this type, hereinafter referred to generally as blocks, are used in wall construction for example to form one or both walls of a cavity wall.
In order to improve the thermal insulation properties of such blocks it is known to provide, as an alternative to simply increasing their thickness, a cavity or cavities in the block which may be filled with a material such as a foamed plastics material, rock wool or the like insulating material. However the filling of the cavities with previously foamed material or material such as rock wool is a time consuming operation, thus adding to the production costs.
Also such materials are not secured to the material of the block and as a consequence tend to be omitted from an open sided cavity such as occurs in the case of a block cut to fit in a space which is smaller than will accommodate a full-size block. To overcome the former problem foamable plastics material may be injected into the cavity or cavities in the block and allowed to foam in situ. However the foaming of the material produces a domed surface at the open end of the cavity, and in order to provide that the foam material extends to the extremities of the cavity a considerable excess of material must be injected and the subsequently protruding domed portion must be cut off in order that the blocks may be stacked or used for building purposes. This process is wasteful of the plastics material and requires that the block must stand for an appreciable period of time after the foaming step before the foamed material is in a suitable condition for cutting. As a consequence the cost of block production by this method is increased unduly.
Another disadvantage of blocks of the abovementioned type is that there is an appreciable loss of thermal insulation in the regions of the block which form the walls of the cavities and provide a thermal path through the block. In order to overcome this problem many elaborate arrangements of cavities within such blocks have been proposed, such arrangements providing that the thermal path through the block is tortuous and relatively long by comparison with the thickness of the block in order to reduce the heat transference therethrough. However such blocks are difficult to produce, and therefore costly, and do not overcome the problem to an acceptable extent. It is an object of the invention to provide a building block in which the above problem is overcome or at least substantially reduced.
As an alternative to the use of the insulated blocks described above, it is known to fill the cavity between the inner and outer walls of the cavity wall construction with a foamed plastics material. However, the foamed material forms a bridge between the inner and outer walls and can lead to condensation or water ingress problems in certain circumstances. In consequence, alternative methods of construction of a thermally insulated cavity wall have been sought. One alternative which has been proposed is that of placing in the cavity between the inner and outer wall a sheet of thermally insulating material and securing such sheet to the inner wall during building. However, such a solution has not been readily accepted by builders since it is time consuming. Furthermore, the sheet can become detached from the inner wall after a period of time and can then form a bridge between the inner and outer walls so that water ingress problems can result.
It is also known to secure to the inner surface of the inner wall a sheet of thermally insulating material, but this is usually done, if at all, by the owner or occupier of the property and not by the builder, since it may not be desirable in all cases depending upon the nature of the property, any fixtu
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Blackwell James B.
Connett Michael
Connett Peter
Anderson Philip
Beamech Group Limited
Farley Walter C.
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