Bulk material supply hopper - has screw conveyor in double walled housing with evacuated annular space to increase bulk density

摘要

The screw conveyor (5) is carried on a horizontal spindle (6) which passes through the base of the feed hopper (1). The outlet of the conveyor (7) is shaped to fit over the sacks to be filled. the screw conveyor passes through a double walled sleeve separated by a space (4). The inner sleeve is made of porous material, and the outer sleeve material is hot porous. The space (4) between the sleeves is maintained under vacuum and draws air from the loose material. The bulk of powdered products can be greatly increased.