| 摘要 |
<p>PCT No. PCT/FI94/00379 Sec. 371 Date Mar. 8, 1996 Sec. 102(e) Date Mar. 8, 1996 PCT Filed Aug. 30, 1994 PCT Pub. No. WO95/07245 PCT Pub. Date Mar. 16, 1995Provided is a clay pigeon which is a saucer-shaped compressed piece of clay and one or more additives. 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 additive content 5-50%, calculated from the dry matter of the clay pigeon. The clay pigeon may also contain another additive reducing drying shrinkage and a component improving the plasticity of the mass. Also provided is a method for preparing a clay pigeon, where clay, one or more additives, and optionally 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 mold in which it is compressed for a moment, and the clay pigeon is removed from the mold while still in a plastic state.</p> |
