Apparatus for stretching a continuous plastics film in a packagi

Details Apparatus for stretching a continuous plastics film in a packagi Apparatus for stretching a continuous plastics film in a packagi

1992-10-09

1994-02-15

Sipos, John

Package making

Apparatus for contraction of cover by stretching or shrinking

533746, 533895, 198575, B65B 4102, B65B 5130

Patent

active

052856216

ABSTRACT:
An apparatus for stretching a continuous plastic film in a packaging machine, in which products fed one after the other are wrapped and sealed within the continuous film, which includes a first conveyor belt, a transverse welding apparatus, and a second conveyor belt, in which the transverse welding apparatus has a horizontally traversing carriage which supports a pair of superposed welding bars and a pressing belt facing the second conveyor belt. The conveyor belts are driven by a speed variator via a pair of transmissions, the first of which drives an end roller of the first conveyor belt and the second drives an end roller of the second conveyor belt by way of a linkage which varies the speed of the two conveyor belts, there being also provided upstream of the transverse welding apparatus, both above the first conveyor belt and operationally linked to the vertical movement of the upper welding bar, elements for clamping the film onto the products wrapped in it.

REFERENCES:
patent: 1606166 (1926-11-01), Green et al.
patent: 4430844 (1984-02-01), James
patent: 4506488 (1985-03-01), Matt et al.
patent: 4709537 (1987-12-01), Ballestrazzi et al.
patent: 4715166 (1987-12-01), Kameda
patent: 4872302 (1989-10-01), van Eijsden et al.

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