Package making – With contents treating – Vacuum or inert atmosphere
Patent
1985-08-16
1986-07-22
Culver, Horace M.
Package making
With contents treating
Vacuum or inert atmosphere
53550, B65B 3108, B65B 3106, B65B 906, B65B 920
Patent
active
046011595
ABSTRACT:
A machine for packaging articles in continuous tubular material, which may be formed by rolling the marginal edges of a flat web around a succession of the product articles to bring the marginal edges into contact and then sealing them continuously to complete the tube, comprises a pair of transverse sealing jaws 14 and 15 which each include a hemi-cylindrical chamber 24 having gas-pervious walls 16 and defining a cylindrical space 25 initially centrally divided by the film between two successive product articles 1.
The film extending diametrically across the space 25 is first of all severed and then suction is applied to the gas-pervious walls 16 to draw the film into contact with the walls 16. To the righthand side of the space 25 is a double impulse sealing system 18, 19 centrally divided by a knife 21 which separates a righthand pack 28 from the film in the space 25, and to the lefthand side of that space 25 is a further double impulse sealing system 18, 20, again with a knife 22 to effect separation. The sealing pads 20 at the lefthand side are movable by means of push rods 27 so that initially they allow the pack 8b to be communicated with the space 25 while the pack 8a has been separated from the space 25, and this enables gas from within the pack 8b to be extracted by way of the hemi-cylindrical chambers 24 and the suction conduits 17. Subsequently the two sealing pads 20 are pressed into contact with their counterpressure pads 18 and the righthand side of the pack 8b is then isolated from the space 25.
Such a machine allows the individual packages to be evacuated so that after the conventional post-shrinking step they are even tidier than in the prior art and the interior is substantially air-free. Alternatively an inert flushing gas may be injected into the pack from the cylindrical space 25 to allow a residual atmosphere of the inert gas in the finished pack.
FIG. 2 shows the arrangement before the beginning of evacuation and FIG. 4 shows the arrangement during evacuation.
REFERENCES:
patent: 2387812 (1945-10-01), Sonneborn et al.
patent: 3009298 (1961-11-01), Gerlach et al.
patent: 3524298 (1970-08-01), Hamilton
patent: 3857222 (1974-12-01), Grebe
patent: 3938298 (1976-02-01), Luhman et al.
patent: 3995407 (1976-12-01), Segale et al.
patent: 4170863 (1979-10-01), Schwanz
Culver Horace M.
Lee, Jr. William D.
Quatt Mark B.
Toney John J.
W. R. Grace & Co., Cryovac Div.
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