The bag has a polyethylene film (4) impermeable to air and interposed between two paper folds (2, 3). The film is folded to form a sleeve with two contactless edges spaced by an interval (5) for permitting free passage of the air for deaeration, during filling of the bag. The fold ...
air inlet (6) and having a primary air distribution chamber (7), the grate (2) in its part lower has a first upper disc (8) which in turn has the alveoli (10) to let the primary air pass, and the lower disc (9) with its alveoli (11), all with means to rotate in a sense....
(3) for passing the primary air, which is supplied through the inlet (6) of primary air and providing a distribution chamber (7) primary air grille (2) in its part bottom has a first upper disc (8) which in turn has alveoli (10) to let the primary air, and the lower disk (9)...