Patent ID: 9205940
Filing Date: 2015-12-08
Classification: B29C,B65B,Y10T

Abstract:
1. A twin lane tray sealer comprising: a pair of conveyors aligned with respective tray feed lanes for conveying trays to a heat sealing tool; a pair of transfer mechanisms each for transferring a plurality of trays together and at a predetermined separation from the respective conveyors to the heat sealing tool wherein the heat sealing tool comprises a plurality of individually operable heaters, each aligned with a respective tray in the tool in use; and control means operable to determine that a tray is missing from a group of trays transferred by a transfer mechanism and not activate the heater aligned with the position of the determined missing tray in the tool; and wherein said control means comprises a tray sensor operable to detect that a tray is missing on the conveyor; and wherein said sensor comprises a weight sensor configured to detect a tray when a weight threshold corresponding to the weight of a known tray is crossed.