Package making – Methods – Conforming by stretching or shrinking of cover over contents
Patent
1986-09-12
1988-03-08
Spruill, Robert L.
Package making
Methods
Conforming by stretching or shrinking of cover over contents
53451, 53551, 53556, B65B 5300
Patent
active
047292105
ABSTRACT:
Process for packaging items having irregular shape and size, singly on in groups, in a stretchable film of plastic material, comprising the operations of forming, filling and sealing a bag from the stretchable plastic film such film being maintained under adjustable tension and stretch and subsequently adherent on the items due to the elastic "memory" of the released film. The machine for operating the process continuously comprises essentially two members subjected to a reciprocating motion, provided with means for gripping, stretching, sealing and cutting the plastic film, each of such members being subjected to a motion having a stroke of varying length and independent from the one to the other member.
REFERENCES:
patent: 2915866 (1959-12-01), Bartlo
patent: 2959901 (1960-11-01), Conti
patent: 3055154 (1962-09-01), Markley et al.
patent: 3070931 (1963-01-01), Zwight
patent: 3703796 (1972-11-01), Inoue et al.
patent: 3872644 (1975-03-01), Giraudi et al.
patent: 4501106 (1985-02-01), Treiber et al.
patent: 4516385 (1985-05-01), Lenker et al.
Padeco S.A.
Spruill Robert L.
Weihrouch Steven P.
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