This is due to the mechanical compression of the press driving out air pockets and aligning wet clay particles and compacting the clay around the sand particles.[1]
Hii ni kutokana na mgandamizo wa kimakanika wa presi inayoondoa vifuko vya hewa na kupanga chembe za udongo mfinyanzi na kuzigandamiza pamoja kuzunguka chembe za mchanga.[1]