Pressing process improvements for roofing tiles using porous moulds
article
Roofing tiles are traditionally produced via pressing using plaster of Paris moulds. A replacement of such moulds by porous PMMA based moulds increases production speed and the durability of the moulds, however results in a non-acceptable surface finish due to enhanced adhesion of the clay to the porous mould. A much better release of the clay tiles after pressing could be obtained by applying a thin layer of a gypsum suspension of the mould starting the production cycle. The Ca<sup>2+</sup>ions caused a surface agglomeration of the clay particles leading to a suppression of adhesion on the porous mould and an improvement of the dewatering and consequently to a better release.
TNO Identifier
408474
ISSN
01739913
Source
CFI Ceramic Forum International, 87(6-7)
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