Bag filling machine for powdery material

US4074507A · kind A · utility

Assignee

• St. Regis Paper Company · US

Inventors

• Walter Ruf · Ditzingen, DE
• Harry Rothmann · Valhalla, US

Key dates

• Filing date: Dec 27, 1976
• Grant date: Feb 21, 1978
• Expiry date: Dec 27, 1996

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65B55/24
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A machine is disclosed to bag powdery material wherein primary and secondary preconditioning chambers are used, having a volume sufficient to give enough time for the powdery material to become de-aerated. This de-aerated powdery material is then supplied to a bulk filling station and a dribble filling station. Bags spouted at the bulk filling station are filled to about 90 percent of their normal capacity and are then moved laterally to the dribble filling station whereat the bags are rapidly filled to a weight close to the desired exact weight and by automatic speed changing means filled to exact weight at a slower rate. The bags are supported at the top by grippers at both filling stations with the calibrated weight scale being actuated by weight on the grippers at the dribble filling station. An auger at the bulk filling station forces the powdery material down into a generally closed bag to force the bag open by the incoming material to thus keep air out of the bag as much as possible. This saves time in the filling of the bags because time need not be spent waiting for the air to escape out of the powdery material in the bag before the bag can be closed and sealed. A vacuum p…