Device for sealing the overlapped end flaps of a thermoplastic m

Details Device for sealing the overlapped end flaps of a thermoplastic m Device for sealing the overlapped end flaps of a thermoplastic m

1989-06-20

1991-01-01

Spruill, Robert L.

Package making

Means to open or erect receptacle

Means to open bag

1565835, 219243, B65B 5118

Patent

active

049810065

ABSTRACT:
The invention relates to a device for sealing the folded over and overlapped end flaps (L1, L2) of the plastics material wrapper for packages (P), particularly for packages of cigaerettes. In this device, the packages (P) to be sealed are passed after each other between the heated sealer bodies (7) of at least a stationary pair of opposite sealer bodies (7--7) the active faces of which engage, in their operative position, the respective ends of the packages (P) with the intermediary of the parallel facing stretches (102) of two endless belts running in the same direction and at the same speed as the packages. According to the invention, the active surface of each sealer body (7) of at least one pair of opposite sealer bodies (7--7) comprises at least two slightly protruding i.e. in-relief zones (8,9; 18,19,20; 108,208,308,109,209,309; 118,119,120,218,219,220) staggered from each other both in the direction (F) of movement of the packages (P) and transversely to said direction. In the operative position of two opposite sealer bodies (7,7), the distances between the surfaces of the slightly protruding zones of the two sealer bodies is such that the higher specific pressure exerted at said slightly protruding zones will not damage the packages (P) and their contents.

REFERENCES:
patent: 3057125 (1962-10-01), Jensen et al.
patent: 3083514 (1963-04-01), Smith et al.
patent: 3140971 (1964-07-01), Crescenzo et al.
patent: 3190056 (1965-06-01), Ramaika et al.
patent: 3353332 (1967-11-01), Bartlo et al.
patent: 3899863 (1975-08-01), Seragnoli et al.
patent: 4220847 (1980-09-01), Focke et al.
patent: 4771683 (1988-09-01), Schermutzki

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