Package making – Methods – Wrapping contents including cover forming
Patent
1982-10-12
1985-07-02
Sipos, John
Package making
Methods
Wrapping contents including cover forming
53464, 53221, 53227, B65B 1106, B65B 5110
Patent
active
045259836
ABSTRACT:
A system for wrapping and sealing objects, such as fresh heads of lettuce, may include two fabric tube type iris valves which are capable of fully closing and opening up to a diameter greater than the object to be wrapped and sealed. The two iris valves may be mounted one above the other; then a sheet of plastic wrap film material is dispensed over the top iris valve, and a head of lettuce is set in place on the sheet of plastic. The sheet of plastic may be dispensed from a roll automatically and may be cut either mechanically or by a hot wire, for example. The upper iris valve is open end, and then, as the head of lettuce or other object slides through and is supported by the lower iris valve, the upper valve is at least substantially closed, rotating and drawing together the edges of the plastic wrap. The plastic sheet material is then heat sealed above the head of lettuce, either above or below the upper iris valve. In one embodiment a carousel arrangement is provided wherein the heads of lettuce are loaded at one station, and wrapped at another.
REFERENCES:
patent: 429759 (1890-06-01), Hiatt
patent: 516638 (1894-03-01), Nininger
patent: 1703641 (1929-02-01), Sowden
patent: 1934756 (1933-11-01), Smith
patent: 2851835 (1958-09-01), Collins
patent: 2915861 (1959-12-01), Voullaire
patent: 3106050 (1963-10-01), Westphal
patent: 3245198 (1966-04-01), Schmeid
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