Patent ID: 9021774
Filing Date: 2015-05-05
Classification: B29C,B29K,B29L,B65B

Abstract:
1. A packaging and filling machine, in which a web-like packaging material is fed continually and is formed to a tube shape, the tube overlapped in both ends of the packaging material is longitudinally sealed along the longitudinal direction, a liquid food is filled up to a liquid level of a predetermined position above an outlet of a filling pipe from the filling pipe in the tube-like packaging material conveyed continually and vertically downward, while the tube is held with a seal jaw and a counter jaw along transversal direction below the liquid level, and is pulled down, the tube is transversally sealed, while the tube is held with seal jaws and counter jaws along transversal direction below the liquid level, and the tube is held with forming flaps at the same time to be preformed, the tube is cut in the transversal seal zone, and packaged containers are manufactured, wherein; the packaging and filling machine comprises a pressure flange being arranged around the periphery of filling pipe below the liquid level in the tube-like packaging material, the pressure flange controls free flows from the lower part to the upper part about the liquid food filled in the tube to keep the pressure of the liquid food in the tube below the pressure flange a positive pressure, and to make the preforming with the forming flaps easy, the packaging and filling machine comprises a covering means, the covering means covers a gap or a potential gap formed in splices of the longitudinal seal zone on the upstream side of points where the liquid food pressure drops due to changes of the liquid food pressure above the seal jaws, the counter jaws and the forming flaps, and the covering means prevents an invasion of external atmosphere substances to the tube due to a dropping to negative pressure of the liquid food pressure by controlling free flows from the lower part to the upper part about the liquid food filled in the tube by the pressure flange.