US 4,165,999 AGranted

Manufacture of surface elements

AssigneeEuroc Development AB

InventorErnst M. Egner

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Abstract

The present invention is concerned with a method for the manufacture of objects having two shaped surfaces from setting material such as cement and gypsum mixtures. In this method a discrete quantity of the setting material is applied to a mold portion having a surface corresponding to one of the shaped surfaces of the object and is permitted to set therein. The improvement of the invention comprises the application of a discrete quantity of the setting material also to a mold portion having a surface corresponding to the second shaped surface of the desired object. The two mold portions are then brought together to form a mold while the setting material contained therein is still shapable. Hereby the quantities of shapable material are pressed against each other to form the desired object. The latter is then separated from the mold portions.

Claims4

Dependent claims

A method of manufacturing molded objects having two shaped surfaces which comprises:

(a) forming a mixture of a setting material and fibers;
(b) spraying said mixture onto a first mold portion having a surface corresponding to one of the shaped surfaces of the object;
(c) spraying said mixture onto a second bendable mold portion having a surface corresponding to the other shaped surface of the object;
(d) permitting said second bendable mold portion of taking a curved shape;
(e) bringing said first and second mold portions together to form a complete mold and a molded object, said curved second mold portion being gradually flattened out in bringing said portions together thereby to prevent air pockets and air pores in the molded object;
(f) bringing said first and second mold portions further together while pressing to form the completed object, and
(g) separating the at least partially set molded object from the mold portions.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/884,338Filed 7 Mar 1978 · continuation in part
Priority: SE 751432418 Dec 1975
Granted: 28 Aug 1979
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

B28B 1/528
Specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement: for producing corrugated sheets
Y10S 264/57
Plastic and nonmetallic article shaping or treating: processes: processes of forming layered products
B28B
Shaping clay or other ceramic compositions
Y10S
Technical subjects covered by former uspc cross-reference art collections [xracs] and digests