Tray forming and welding machine

Details Tray forming and welding machine Tray forming and welding machine

1974-08-13

1976-05-11

Coan, James F.

93 41, B31B 326, B31B 146

Patent

active

039554821

ABSTRACT:
Preformed tray blanks, e.g., of an expanded foam thermoplastic material, are individually transported from a supply hopper into registration with a die cavity through which a mandrel forces the blank. In passing through the die, the blank is sequentially moved through sidewall-erecting, radiant heating, and corner tab folding stations by the extension stroke of the mandrel. A fluid power and control system moves the mandrel through these stations at desired different velocities to maximize the rate of sidewall erection, to optimize the rate of heat transfer to those surface areas of the blank to be welded together, and to minimize the open time between the heating and welding phases. The control system also optimizes the dwell time of the mandrel in a fourth station at which the heat plasticized, mutually contacting surfaces are pressed together to solidify or vulcanize, after which the mandrel is retracted, the formed tray being stripped therefrom by a means at the exit end of the die cavity. An electromechanical control circuit maintains a feed rate of individual blanks in phase with the extension and retraction cycle of the mandrel relative to the forming and welding die.

REFERENCES:
patent: 2843027 (1958-07-01), Sevison
patent: 2997928 (1961-08-01), Hoyrup
patent: 3115073 (1963-12-01), Kreimendahl
patent: 3125007 (1964-03-01), Jaroff et al.
patent: 3376796 (1968-04-01), Gordon
patent: 3421416 (1969-01-01), Benzon-Petersen
patent: 3451317 (1969-06-01), Hakansson et al.

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