An evacuator for a plastic bag containing viscous liquid within a rectangular, parallelepiped container having a drain positioned at a bottom edge region uses a windlass for drawing and winding an evacuated upper region of the bag to a region above the drain. A bag wall region diagonally...http://www.google.fr/patents/US5765723?utm_source=gb-gplus-shareBrevet US5765723 - Bag evacuator
