Open top plastic bag sealer
AssigneeThermoguard Insulation Co.
InventorDuane Sanders
Life of this patent
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Abstract
A machine is described for closing and sealing the upward ends of filled plastic bags. It includes a locating mechanism that positions bags successively at a closing and sealing station. The normally flexible top of each partially filled bag is formed into an upwardly open rectangular configuration by a forming mechanism. A folding mechanism operates to fold transverse short sides of the configuration inwardly. A heat element and associated pad are located on opposite longitudinal sides of the bag. They are pressed together against the folded longitudinal sides to heat the material and allow the sides to fuse together and seal the bag.
Claims8
Apparatus for closing and sealing the upwardly open ends of upright flexible plastic bags that have been filled with a formable material, comprising:
- a framework;
- bag locating means on said framework for positioning successive bags at a closing and sealing station;
- spaced facing suctions means for engaging and forming the open bag end;
- a vertically movable carriage on said framework supporting the suction means;
- means for moving the carriage vertically from a lowered position wherein the suction means are located at an elevation below the level of material within a bag at the sealing station and a raised position with the suction means at an elevation even with the upwardly open end of the bag to form the open bag end into a rectangular configuration with integral longitudinal and transverse sides;
- folding means for engaging the transverse bag sides and folding them inwardly in such a manner that they become overlapped by the longitudinal sides;
- and
- heat sealing means on said framework adapted to press the longitudinal sides together over the folded transverse sides and fuse the plastic material thereof together.
Dependencies are inferred from the claim text.