Package making – Apparatus for contraction of cover by stretching or shrinking
Patent
1978-09-25
1981-02-03
Sipos, John
Package making
Apparatus for contraction of cover by stretching or shrinking
53587, B65B 1104
Patent
active
042480310
ABSTRACT:
There is disclosed a machine for wrapping a skid-supported load with stretch wrap film. A roll of film is moved up and then down, at the same time that the turntable which carries the load to be wrapped rotates on its axis. The film is thus wound around the load in the form of a spiral. The machine is provided with dials for setting the skid height and the load height, so that the overall wrap is within limits set by the operator. The operator also sets a dial to control a predetermined number of extra wraps at the top of the load and at the bottom. Wherever reinforcement is required, the pressing of a "reinforce" button allows extra wraps to be formed. The tension in the film builds up from a minimum value to a maximum value during approximately the first half turn of the turntable; unlike the prior art, the maximum tension is not suddenly applied as the wrapping is in progress. The operator can also control the magnitude of this maximum tension.
REFERENCES:
patent: 3034718 (1962-05-01), Freitas
patent: 3983679 (1976-10-01), Zemke
patent: 4050221 (1977-09-01), Lancaster
patent: 4058954 (1977-11-01), Asami
patent: 4077179 (1978-03-01), Lancaster
patent: 4079565 (1978-03-01), Lancaster
patent: 4102513 (1978-07-01), Guard
patent: 4109495 (1978-08-01), Shulman
patent: 4136501 (1979-01-01), Connoly
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Sipos John
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