Package making – Plural layer package material – Lining preformed receptacle
Patent
1979-10-03
1981-07-28
Bray, W. D.
Package making
Plural layer package material
Lining preformed receptacle
53386, 493186, B65B 4330, B31B 1100
Patent
active
042803136
ABSTRACT:
In plastic pouch forming, improved vacuum boxes that are movable toward and away from one another are provided. Each vacuum box comprises a series of superimposed, paired, mutually spaced vacuum ports in fluid communication with one another, the outer pair of ports being resilient and adapted to frictionally engage a wall portion of a flattened pouch and to flex open upon application of a vacuum to draw portions of the pouch wall into a cavity defined by an underlying port. In the specific and preferred embodiments of the invention, the vacuum boxes comprise (a) a vacuum chamber defined by a hollow metal box body and a cover plate comprising a pair of vacuum ports; (b) a resilient rubber pad affixed to the box cover plate comprising a pair of vertical, elongated vacuum ports, preferably in the form of slots and aligned with overlying the vacuum ports of the cover; and (c) a thin, high friction resilient facing affixed to the rubber pad comprising a pair of vertical, elongated vacuum ports, preferably in the form of slits, and overlying the vacuum slots, preferably in offset lateral relation thereto. A flattened, pouch is placed between the vacuum boxes and a vacuum is introduced to force the confronting flat surfaces of the pouch into frictional engagement with the facing material and to flex the slits formed therein thereby drawing portions of the pouch walls into the slits and partially into the cavity formed by the vacuum slots.
REFERENCES:
patent: 3965652 (1976-06-01), Cimins
patent: 4150519 (1979-04-01), Akkala
Akkala Walter I.
Gorshe Thomas M.
American Can Company
Auber Robert P.
Bartlett Ernestine C.
Bray W. D.
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