Package making – Closing packages and filled receptacles – By means adapted to engage outturned seam of package cover
Patent
1985-04-25
1986-03-11
Coan, James F.
Package making
Closing packages and filled receptacles
By means adapted to engage outturned seam of package cover
53371, 53383, 53526, B65B 5114
Patent
active
045745609
ABSTRACT:
Apparatus for closing filled sacks, preferably large sacks, which consist at least in part of thermoplastic material, comprises a feeder for feeding the filled sacks into a closing station. The feeder preferably comprises a roller conveyor or a belt conveyor. The apparatus also comprises means for holding the top end portion the sack above the contents of the sack, pressure-applying bars, which are parallel to each other and adapted to be lowered onto the contents of the sack on both sides of the sack end portion, which is held taut, which pressure-applying bars when in a lower position define between them a gap for the passage of the sack between said bars, and closing means provided above the pressure-applying bars. The closing means comprise welding bars and backing bars, which engage the sack end portion between the end-holding means and the pressure-applying bars and are disposed on opposite sides of said sack end portion. That of the pressure-applying bars which is disposed on the trailing side of the sack is provided with adhesive discharge nozzles directed toward the upper wall portion of the sack in contact with the contents of the sack, and that of said pressure-applying bars which is disposed on the leading side of the sack comprises a folding edge or folding rod, which faces the end of the sack. When the end seam weld has been formed and the welding and backing bars have released the sack and the conveyor has subsequently been restarted said folding edge or folding rod causes the end portion of the sack to be folded down onto and forced against the flattened upper portion of the trailing wall of the sack.
REFERENCES:
patent: 3866395 (1975-02-01), Timmerbeil
patent: 3968629 (1976-07-01), Gidewall et al.
patent: 4241560 (1980-12-01), Deimel et al.
patent: 4510736 (1985-04-01), Muller
Huwelmann Helmut
Tetenborg Konrad
Coan James F.
Windmoller & Holscher
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