Package making – Methods – Forming a cover adjunct or application of a cover adjunct to...
Reexamination Certificate
1999-04-29
2001-08-28
Sipos, John (Department: 3721)
Package making
Methods
Forming a cover adjunct or application of a cover adjunct to...
C053S463000, C053S139200
Reexamination Certificate
active
06279297
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for the hermetic packages of various products, in particular food products, inside an envelope of flexible material, openable and re-closeable after each partial drawing of the product.
An apparatus for carrying out such process is a further object of the invention.
2. The Prior Art
As known, there are various types of air-tight packages currently available, in particular for easily perishable food products, consisting of envelopes generally of flexible material able to exclude the exposure of the product to the open air and at the same time to allow that the packaged product be recognised through inscriptions, designs and figures reported on the envelope. It is also known that the current air-tight envelopes for food products made of plastic material, cardboard and the like, while, on one side, have the advantage of resulting long lasting and of securing the air-tightness, on the other side, they turn out to be difficult to open, requiring for this operation the employment of scissors and knives, which can come out to be dangerous.
Moreover, the current hermetically sealed envelopes have the drawback that they cannot be re-sealed once they are opened to allow the partial drawing of the product. In the practice, this forces the user to seek expedients to try to close the product as hermetically as possible after each drawing, such as, for example, folding the open side of the package over itself, or wrapping the package inside plastics films or other sort of envelopes.
The possibility of using laminated plastics films or sheets for carrying out the air-tight wrapping of products of various types is also known; in such cases, an edge region of laminated film, closing the opening made in the envelope of the packaging carried out by means of the film itself, can be separated by detaching the same edge of the envelope as it were a peel; this hermetic packaging system is known in the packaging industry as “inside to outside sealing”.
It is known in fact that the laminated plastics film is able to seal two overlapping layers of the same film by mutual adhesion, which layers can be separated from each other to open a package and re-seal it again, after each partial drawing of the product therein contained.
The only serious drawback present in the envelopes carried out by laminated and separable films is that they allow the formation of envelopes in an shape and size unique to each single type of products, in that the apparatuses currently employed for producing such a kind of packaging do not permit to produce different types of packages; said apparatuses have to undergo in fact conversions and structural modifications as well as regulations for producing the envelopes in different shapes and sizes, in order to adapt them to the various products.
DE-A-2939791, Beck, discloses a process for the production of a small bag which can be opened and closed again containing the product to be packed, characterised in that a thread of adhesive is stuck onto a first sheet, that a second sheet is applied on the first sheet, that the ensemble constituted by the first and the second sheet joined together is joined to a third sheet on which the product to be packed is placed; the ensemble is joined to the third sheet by means of two joints, an upper joint at the top of the bag and a lower joint at the bottom of the bag; finally the bag is sealed on the sides by means of a seam.
The apparatus for carrying out the process is constituted by a first spool from which the first sheet unfolds, by a second spool for the second sheet and by a third spool rotating in opposite direction, for the third sheet.
The bag obtained is provided with an upper sealing line joining the second sheet to the third sheet, a lower sealing line joining the first sheet to the third sheet and an adhesive line joining the second sheet to the first sheet.
U.S. Pat. No. 3,022,613, Powers discloses a process for packaging a product comprising forming a continuous envelope from a continuous wide web of heat-sealable sheet, formed by longitudinally folding the web on a longitudinal fold line to provide a first and a second superimposed walls, integrally joined, and providing a marginal portion which is folded on a longitudinal fold line constituting a flap-forming portion.
According to a variation of the process the envelope is formed from two individual webs of the same material, heat sealing the webs along an edge of the envelope, so forming a lower joint at the bottom of the envelope. According to another variation, the envelope is formed from two individual webs and a tape, each of heat sealable sheet, heat sealing the webs and the tape, so forming a lower joint at the bottom of the envelope and an upper joint at the top of the envelope.
SUMMARY OF THE INVENTION
An object of the present invention is therefore to afford an industrial process for forming air-tight envelopes, openable and re-closeable after each partial drawing of the product, conceived in such a way as to allow the production of packages of various shapes and sizes in an easy and reliable way, thus eliminating the limitations of use present in the current production methods for air-tight envelopes and allowing to produce openable and hermetically re-closeable envelopes, without employment of cutting tools and the like. Another object of the present invention is to carry out a method of packaging for various products able to employ every sort of sheets within packaging material of flexible type, such as plastics, paper, cardboard, metallised foil and the like.
A further object of the invention is to offer a process such as that described above, which is conceived in such a way as to be carried out more or less integrally over the machines currently employed in the packaging industry, and more precisely, such as not to require particular conversion procedures in the sealing and/or sizing displays and in the regulation means of said current machines for modifying the volume and the shape of the sealed enclosure constituting the requested packaging.
These and other further objects, which will be more clearly hereinafter evidenced, are reached through a process for the application of an air-tight wrapping material around a solid product of various shape and consistency, in order to substantially obtain a package of flexible material for food products, openable and re-closeable after each partial drawing of the product, which process consists:
in using two quadrangular sheets of different material as wrapping flexible material, of which at least one is laminated and of a material separable from the other sheet, having such a size as to allow the formation of an enclosure in pre-defined sizes;
in locating said two sheets in a partly overlapping position in two adjacent and parallel planes, so as to allow a first longitudinal side edge of the first sheet to overlap a first longitudinal side edge of the second sheet, thereafter
in joining said first longitudinal side edges, so that they successively come out to be separable from each other, once the packaging is over, then
in storing the product to be packaged in said partly overlapping and extended sheets and in folding the same sheets around the product until they partly overlap each other, leaving the two opposed side edges of the same sheets free and extended; then
in tightly joining together said opposed first longitudinal side edges so as to partly wrap said product; then
in folding the ends of the second extended side edges over each other, protruding from the opposed ends of the partly wrapped product, so as to allow them to be tightly joined and thus to form two opposed terminal closures, so as to obtain a substantially parallelepiped package, hermetically sealed, openable and re-closeable by separating and raising the exterior longitudinal first side edge with respect to the first edge region of the underlying sheet.
More particularly, the outermost of said first longitudinal side edges is joined with the underlying o
BG-Pack S.R.L.
Collard & Roe P.C.
Sipos John
LandOfFree
Process for the production of a hermetic recloseable package... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the production of a hermetic recloseable package..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of a hermetic recloseable package... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2435672