Clay pigeon and a method for the preparation thereof

Details Clay pigeon and a method for the preparation thereof Clay pigeon and a method for the preparation thereof

F - Mech Eng,Light,Heat,Weapons

41

J

F41J 9/16 (2006.01) B28B 1/00 (2006.01) C04B 33/13 (2006.01) C04B 33/132 (2006.01) F41J 1/01 (2006.01)

Patent

CA 2171467

The object of the inven- tion is a clay pigeon which is a saucer-shaped compressed piece made of clay and one or more additives. According to the invention, one of the additives is a calcium-based compound which reduces the drying shrinkage of clay and stabilizes the clay, which is preferably limestone powder or mortar. The clay content is at least 50 % and the ad- ditive content 5 - 50 %, cal- culated from the dry matter of the clay pigeon. The clay pigeon may also contain an- other additive reducing dry- ing shrinkage and a component improving the plasticity of the mass. The invention also comprises a method for preparing a clay pigeon, where clay, one or more additives, and possibly a component improving the plasticity of the mixture are mixed to form a mass. Water is added if necessary to improve the plasticity of the mass, the mass is fed into a mould in which it is compressed for a moment, and the clay pigeon is removed from the mould while still in a plastic state.

Pigeon d'argile qui est une pièce comprimée en forme de soucoupe, constituée d'argile et d'un ou plusieurs additifs. Selon la présente invention, l'un des additifs est un composé à base de calcium qui réduit le retrait par séchage de l'argile et stabilise l'argile, de préférence de la poudre ou du mortier de calcaire. La teneur en argile est d'au moins 50 % et la teneur en additif est de 5 à 50 %, calculée sur la base du matériau sec du pigeon d'argile. Ledit pigeon d'argile peut également contenir un autre additif réduisant le retrait par séchage et un constituant améliorant la plasticité de la masse. La présente invention concerne également un procédé de préparation dudit pigeon d'argile selon lequel l'argile, un ou plusieurs additifs et éventuellement un constituant améliorant la plasticité du mélange sont mélangés pour former une masse. On ajoute de l'eau si nécessaire pour améliorer la plasticité de la masse, on introduit ensuite ladite masse dans un moule dans lequel on la comprime pendant un moment, puis on retire le pigeon d'argile du moule alors qu'il est encore à l'état souple.

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