Package making – Methods – Conforming by stretching or shrinking of cover over contents
Patent
1997-10-30
1999-04-13
Johnson, Linda
Package making
Methods
Conforming by stretching or shrinking of cover over contents
53556, 53342, 53390, 53488, B65B 5300, B65B 728
Patent
active
058932615
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device suitable for applying a stretch plastic film of commonly used type, for example for wrapping food, onto the opening of containers in order to seal them for preservation or for long-life of their contents.
PRIOR ART DISCLOSURE
Up to now, in order to use a stretch film to seal a container, the most common procedure consists of applying by hand a stretch film of sufficient size and, after having positioned it in the best way over the container opening, a downward movement over the container opening is exerted by hand, so to make the film adhere to the opening itself; this procedure is ended up by joining together and overlapping the free edges of the film around the container opening, in order to make this "cap" stay in its place.
Obviously, this procedure lead to the waste of a lot of material; furthermore, it does not normally ensure the hygiene necessary in these cases and it does not guarantee a constant and assured adhesion of the film to the container opening. Moreover, said procedure has the great disadvantage of wasting plastic material, which is no more useful and lead to an increase of pollution.
The device which is the object of the present invention is able to avoid all these drawbacks, assuring an easy and efficient hermetic sealing with only little amounts of film.
U.S. Pat. No. 4,199,917 describes a reusable device for applying a stretch film lid to a cup, comprising a planar rigid peripheral frame and a multiplicity of finger elements extending inwardly therefrom. When said finger elements are urged against the brim of the cup, they displace upwardly, thus opening a passageway therebetween to permit the cup to pass thereinto, facilitating the film stretching. Finally, the film is released from the device, which can be reused with another length of stretch film.
SUMMARY OF THE INVENTION
The object of the present invention is a device for sealing container openings by applying a stretch plastic film; said device comprises a support having at least one hole piercing the length-width support plan and supporting said stretch plastic film; the diameter of said at least one hole is greater than the diameter of the container openings to be sealed and the stretch plastic film is placed on said at least one hole and is taut and adherent to said support.
DESCRIPTION OF THE DRAWINGS
Some embodiments ol the device according to the present invention are schematically illustrated in the following drawings:
FIG. 1 shows a perspective, a planar and a cross-sectional view of a first embodiment of the device of the invention, wherein the film is held adherent to the support, having a hole, by the counter-pattern.
FIG. 2 shows a perspective, a planar and a cross-sectional view of a second embodiment of the device according to the present invention, wherein the support, having three circular holes of different size, the film and the counter-pattern are held together by means of mushroom-shaped protrusions of said support, which are embedded by force into the corresponding holes of the counter-pattern.
FIG. 3 shows a perspective, a planar and a cross-sectional view of a third embodiment of the device according to the present invention, said cross-sectional view illustrating the separate parts of the device before assembling; in this figure, the support, the film and the counter-pattern are held together by means of the elastic clamps on the two opposite rims of said support.
FIG. 4 shows a perspective, a planar and a cross-sectional view of a further embodiment of the device according to the present invention, with the separate parts of the device before assembling; in this figure, the film is held adherent to the hole of the support, by means of the elastic ring embedded around the outer ring-like protrusion of the conic trunk of the hole.
FIG. 5 shows a perspective a planar and a cross-sectional view of another embodiment of the device according to the present invention, in which the hexagonal support and the membrane are glued together.
F
REFERENCES:
patent: 2008802 (1935-07-01), Stanek et al.
patent: 3321103 (1967-05-01), Phillips
patent: 3519128 (1970-07-01), Swanberg
patent: 4018034 (1977-04-01), Keren
patent: 4199917 (1980-04-01), Mitchell
patent: 4658568 (1987-04-01), Reid et al.
patent: 5312031 (1994-05-01), Thelen et al.
Ribi Guido
Ribi Leon A.
Johnson Linda
Leon Ribi
World Wide Sealing Corp.
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