Package making – Methods – With contents treating
Patent
1994-03-23
1997-01-07
Sipos, John
Package making
Methods
With contents treating
53510, 53557, 53433, 53442, B65B 3102
Patent
active
055905099
ABSTRACT:
A process for packaging a product on a receptacle includes advancing a film tubing on a conveyor, the tubing having therein a product on a receptacle, the film having a forward end which is sealed; sending a gaseous mixture into the tubing; blowing heated air onto an outer surface of the forward sealed end region of the tubing to pre-shrink this end of the tubing and to expel gas rearwardly from the forward region; applying a vacuum inside the tubing from a rearward portion of the tubing of film, to facilitate the welding of the tubing of film at the rear portion of the container; heat sealing the tubing in an area rearward of the receptacle, so that the receptacle having the product thereon is surrounded by the film; separating the sealed tubing film portion from a remainder of the tubing film; and heat-shrinking the sealed portion of the film. The process of the invention solves a problem in the packaging of products of the "bloody offals type," i.e., in preventing the smearing of stains over the packaging film during the shrinking of the film against the product.
REFERENCES:
patent: 4034536 (1977-07-01), Mahaffy et al.
patent: 4747253 (1988-05-01), Schulte
patent: 4831811 (1989-05-01), Nixon, Jr. et al.
patent: 4964259 (1990-10-01), Yluisaker et al.
patent: 5179819 (1993-01-01), Sukeyasu et al.
patent: 5237800 (1993-08-01), Omori
Esteves Robert
Fruchard Michel
Hurley Jr. Rupert B.
Kim Gene L.
Sipos John
W. R. Grace & Co-Conn.
Wasatonic John J.
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