Patent ID: 8790010
Filing Date: 2014-07-29
Classification: B32B,B65B,B65D,Y10T

Abstract:
1. A cement bag for pourable cement, the cement bag for cement comprising: a cement bag wall formed of a laminate having a first inner layer and a second outer layer, the cement bag wall defining a storage space for the pourable cement, the first inner layer having a first exterior surface and an opposite first interior surface, the second outer layer having a second exterior surface and an opposite second interior surface, the first exterior surface being bonded with the second interior surface, and the first interior surface defining the storage space, and the second exterior surface defining an exterior of the cement bag wall, the first inner layer being formed of an air permeable film material and the second outer layer being formed of an air permeable nonwoven material, wherein the laminate is air permeable perforated, and wherein a perforation effects a penetration of the film material into the nonwoven material, wherein nonwoven fibers thereby stabilizing the configuration created by the perforation, wherein perforation creates a semipermeable membrane in which liquids do not penetrate into the cement bag, but air can escape from the cement bag.