B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/652
B29C 67/20 (2006.01) B29C 51/22 (2006.01) B29C 59/04 (2006.01) B29C 51/08 (2006.01)
Patent
CA 1250116
ABSTRACT The apparatus of the invention, which is particularly adapted for being applied to a continuous rotary hot-molding machine for forming trays or any other containers of a relatively limited depth from a foil of foamed plastics, is provided for internally embossing the bottom walls of said trays. The apparatus comprises elements constructed in form of wheels, which are one for each single longitudinal row of cavities of the multiple molds, and which are keyed to a rotary shaft arranged parallel to the shaft of the mold-carrying drum in the hot-molding machine, and perpen- dicularly to the forward direction of the foil. Each one of these wheel elements carries in its periphery any desired number of dies (or plug) having a lateral profile that is curvilinear (or is like a circle arc, or is differently shaped), and spaced apart according to the distance between the single multiple mold cavities upon which they act, and having their outer surface provided with special embossing projections or recesses. Of course, the size of each die is not greater than the size of the bottom wall of a tray to be embossed. The thus formed embossing devices are urged with a suitable pressure against the molds, and are rotated in the direction opposite to the mold-carrying drum in the rotary hot-molding machine, at such a speed that each die will act upon the bottom of one cavity of the multiple mold, and that the peripheral speed of the embossing die and the speed of the bottom wall of a tray to be embossed, contained in the mold cavity, be the same or sensibly the same at the contact area, the whole in such a manner that the dies will rotate with no slippage in the mold cavities, to pressure-emboss the bottom walls of the trays during the hot-molding step.
499721
Martelli Nerio
Ottaviani Alvaro
Sabba Pier L.
Marks & Clerk
Nespak S.p.a. Societa Generale Per L'imballaggio
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