Plastic and nonmetallic article shaping or treating: processes – With step of making mold or mold shaping – per se – Utilizing surface to be reproduced as an impression pattern
Patent
1979-09-10
1981-03-03
Czaja, Donald E.
Plastic and nonmetallic article shaping or treating: processes
With step of making mold or mold shaping, per se
Utilizing surface to be reproduced as an impression pattern
264256, B29C 102
Patent
active
042540771
ABSTRACT:
A method for making decorative concrete blocks which have inlays and which are especially suitable for use as floor or patio tiles. The method involves two steps in which concrete with two different degrees of wetness is employed. As an initial step, a first form, which is configured to define the desired inlaid pattern, is placed on a support. The form is filled with a first charge of concrete, which has the lesser of the two degrees of wetness and is preferably colored, to produce a pattern for the inlay. Thereafter, the concrete in the first form is compacted whereafter the form is removed without delay and the material is allowed to harden. In a further step, a second form, which is configured and dimensioned to surround the concrete inlay pattern, is placed on the support. A charge of concrete with a greater degree of wetness is then poured into the second form until it produces a layer which surrounds the concrete inlay pattern. The wet concrete is then allowed to set and harden sufficiently such that it is bonded to the concrete inlaid pattern formed by the first charge of concrete. To enhance the adherence between the concrete charges, the first charge is roughened by edge trowelling. Also, the first form is made with tapered elements to facilitate both compacting and subsequent withdrawal.
REFERENCES:
patent: 1137595 (1915-04-01), Eyl
patent: 3515779 (1970-06-01), Jones
patent: 3922413 (1975-11-01), Reineman
Fontana John D.
Fontana Louis R.
Czaja Donald E.
Hall James R.
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