FR2532281A1 - REINFORCING PIECE FOR ENVELOPE FOR FOOD PRODUCTS - Google Patents

Abstract

THE INVENTION RELATES TO A REINFORCEMENT PIECE FOR A PACKAGING ENVELOPE FOR HAMS, SAUSAGES AND OTHER FOOD PRODUCTS. THE ENVELOPE 1 INCLUDES A RETRACTABLE FILM 2, THE INSIDE SURFACE OF WHICH IS THERMOS-SEALABLE 3. THIS ENVELOPE IS CURVED SO THAT ITS TWO EDGES 1A AND 1B ARE COVERED, AND AN ADHESIVE TAPE 6 CONSTITUTES A "4" NYLON LAPTOP SHRINKABLE AND WITH A THERMOS-SEALABLE LAYER 5, IS APPLIED TO THE INSIDE FACE OF THE COVERING PART OF THE SHEET OF THE ENVELOPE AND IS THERMOSCAL TO THIS PART. FIELD OF APPLICATION: PACKAGING OF FOOD PRODUCTS SUCH AS HAMS, SAUSAGES, ETC.

Description

253228-1

  The invention relates to a reinforcing

  attached to a retractable "nylon" envelope, used for

  the packaging of hams, sausages and other

  similar food products The foil of an envelope made of a shrinkable "nylon" film whose inner surface is coated with a heat-sealable layer is curved to form a cylindrical envelope of which two

  edges overlap, and the inside of the part of

  overlap is covered with adhesive tape consisting of 1.0 "Nylon" retractable, heat-sealed on this part When a product such as meat is introduced in this

  envelope and boiled, the upper edge of the foil

  the envelope rises to the outside to

  the shrinkage under the effect of heat shrinkage and 1.5 moisture absorption, but the adhesive tape and the

  sheet C S the envelope remain heat-sealed and do not

parent not.

  The invention relates to an envelope made of "nylon" retractable for the packaging of hams,

  sausages, minced fish meat and other food products

  The envelope is packaged with such food products, and it is heated (boiled) so as to have a thermal shrinkage giving it a fold-free, stretched state, in which it is tightly bound.

  The invention relates more particularly to

  In particular, a covering joint structure of the sheet of the envelope, made by raising a sheet

  in "nylon" retractable so that it takes a cylindrical form.

  the two edges of the leaf overlapping and

  both heat-sealed (this lap joint is designated

hereinafter "reinforcing piece").

  Figure 1 of the accompanying drawings and described above.

  after represents a reinforcing part of a conventional envelope

  Made in retractable "nylon" In this conventional structure, an envelope sheet 03, consisting of a

  retractable "Nylon" film 01 and a thermo-

  sealable (polyethylene layer) 02 applied to the inner surface of the "nylon" film, is bent so that its two edges are in contact

  end-to-end, and an adhesive tape 06 consisting of a pel-

  05 of "Nylon" retractable and a thermal layer

  sealable (polyethylene layer) 04 applied to the inner surface (bonding face) of the "nylon" film, is applied to the inner side of the

  seal at the end of the envelope sheet 03 and is thermally

  moscellée on this sheet 03 to form a cylindrical envelope.

  In this classic structure of

  strong, when the envelope is used in the form of a

  commercial article by filling meat or otherwise, fer-

  the two open ends with a staple

  or other means, hot sterilization of the article

  When it is boiled and then cooled, the edges of the seal at the end of the sheet 03 of the envelope tend to rise outwards as shown in FIG. 2, due to the differences in heat shrinkage between the

  film 01 of "Nylon" and the heat-sealable layer 02.

  A too large increase weakens the resistance

  the connection of this joint, since the bound zone of the

  adhesive 06 is reduced, which has the effect of breaking the package The solution to this problem is to use an adhesive tape 06 of greater width for

  establish a wider bonding zone between the adhesive tape

  sif 06 and sheet 01 of the Ceo 3 envelope, this enlargement

  of the liaison zone is impractical in the case

  of a commercial product, because it requires a significant amount of

  with tape and heat seal

expensive.

  In addition, the fact that the edges of the sheet de-

  pass, as shown in Figure 2, night to aesthetics

  external appearance, thereby reducing the commercial value of

product.

  The object of the invention is to eliminate this problem.

  According to the invention, a cylindrical envelope is formed, not by butt jointing the two edges of a sheet, but first by placing the two edges t 532281 of the sheet in contact with each other. other, and so that they overlap, then by the application of an adhesive tape on the inner surface of the lap joint

  and by heat-sealing this ribbon on the sheet of the

develops.

  The invention will be described in more detail in

  annexed drawings as an ex-

  and in which FIG. 1 is a partial cross-section

  reinforcement part of a classic packaging envelope

  ham slice in which the two edges of the envelope sheet form an end-to-end seal and an adhesive tape is bonded to the inner face of the joined edges of the sheet to secure them in position; FIG. 2 is a partial section showing the state (curved state) of the part of the envelope of FIG. 1 comprising the reinforcement piece, after heat sterilization; Figure 3 is a partial cross-section

  showing the state of the area of the reinforcement part of a

  veloppe according to the invention, the two edges of the sheet overlap, an adhesive tape being applied on the inner face of these edges to fix them to one another; Figure 4 is a partial cross section of the envelope of Figure 3 (envelope according to the invention) after sterilization by heat; and

  FIG. 5 is a perspective view of a jam

  packaged in an envelope with a coin

strong according to the invention.

  The invention relates to a reinforcement piece intended.

  with the packaging of hams, sausages or others, the reinforcing piece being able to maintain a binding strength

  even after heat sterilization.

  According to the invention, the two edges of the sheet of a retractable "nylon" envelope, whose inner face carries a heat-sealable layer (for example a layer

  polyethylene), are close to each other and

  one above the other (put in

  forming a cylindrical sheet, and an adhesive tape, which also comprises, on its bonding face, a heat-sealable layer, is applied on the inner face of the overlapping edges of the sheet of the envelope and is heat-sealed at these edges to connect them securely. In accordance with this reinforcing member arrangement, when the adhesive tape is heat sealed, the overlapped edges of the envelope sheet are also bonded to each other because the heat sealable layer of the

  inner side of the upper edge of the leaf of the enve-

  loppe melts and binds to the adjacent surface of the "nylon" sheet Therefore, the joined and bound edges of the

  leaves do not recover during the previous treatment.

  sterilization by heat.

  When the envelope sheet shrinks after heat sterilization, the upper edge of the sheet is detached and lifted. This recovery may extend over the entire width of the overlapping edges of the sheet when this portion is weak. This recovery is due to the difference in thermal shrinkage between

  the retractable "nylon" sheet and the thermoset layer

  lable so that, if the width of the coverage area is

  is calculated to tolerate this difference, it is possible to prevent this recovery from occurring on any

  the width of the overlap area.

  As previously described, the overlapping edges

  of the envelope sheet are joined by a ribbon

  adhesive applied on their inner side so that the

  may only take place in the recovery zone.

  the leaf, but be prevented from

  heat sealed between the adhesive tape and the foil

  so that the strength of this portion of the sheet comprising the reinforcing piece is not changed after the sterilization heat treatment. Thus, an important feature of the invention resides in the fact that the relegation: caused by the sterilization heating can only occur in the recovery area of the

  sheet of the envelope, but is prevented beyond the

  adhesive tape (reinforcement piece) as described above.

  above, so as to prevent any reduction of the resistance

  the area of the envelope comprising the reinforcement piece. Figure 3 shows the embodiment

  of the invention as described above.

  the reference numeral 1 designates the sheet of the

  veloppe consisting of a film 2 of "nylon" retractable-

  on its inner surface a film of poly-

  ethylene Two edges la and lb of the sheet 1 of the envelope

  pe are brought closer to one another and placed one

  above the other (1b) to form a cylinder.

  Reference numeral 6 denotes an adhesive tape

  sif composed of a sheet of 4 "nylon" retractable carrying

  on its inner surface a film 5 of polyethylene.

  This adhesive tape 6 is therefore made of the same material and

  has the same structure as the sheet 1 of the envelope.

  The adhesive tape 6 is applied to the inner face of the

  overlapping edges of the sheet 1 of the envelope,

  Thus, to cover the edge 1b of the sheet inside, and it is heat-sealed to join the two edges 1a and 1b overlapping. During this heat-sealing operation, the

  laminated sheet is pressed from both the outer face and

  adhesive tape 6 and the outside of the foil.

  1 of the envelope by heated bars, which causes not only a melting of the polyethylene 3 of the sheet 1 of the casing and the polyethylene 5 of the ribbon

  adhesive 6, but also a simultaneous fusion of the poly-

  ethylene 3 on the inner surface of the

  1 of the sheet covering the other edge 1b, so that the molten polyethylene 3 binds relatively firmly

  on the adjacent surface of sheet 2 of "nylon".

  When using the "Nylon" envelope

  retractable having the structure described above,

  form to the invention, meat or other foodstuff

  The two ends of the envelope are sealed with staples or other members 7 as shown in FIG. 5, then the entire package is subjected to sterilization

  In the heat The packaging is heated again

  for a short time so that the folds formed on the surface of the sheet, by the sterilization heater,

  eliminated, and the resulting packaging constitutes a

marketable duality.

  During the heat sterilization step, a difference in heat shrinkage between the retractable "nylon" 2 and the polyethylene 3 and due to heating and moisture absorption causing a rise of the upper edge of the sheet, on the upper side, but the portion of the sheet 1 of the envelope comprising the reinforcement piece remains fixedly bonded by the bonding of the adhesive tape 6 on its inner face Therefore, there is no risk of weakening the envelope and breaking it at the level of the part comprising

the reinforcement piece.

  Another important feature is that the bearing occurs only at the upper edge of the sheet, i.e. only one edge is raised on the shell, which mitigates the deterioration of the appearance. outside compared to the case of conventional envelopes which

two edges stand up.

  It goes without saying that many modifications can

  may be made to the reinforcement piece described and

  felt without departing from the scope of the invention.

Claims (2)

  1 reinforcement piece for an envelope (1)   made of retractable "nylon", used for jam packaging.   good, sausages or other, characterized in that an enve-   loppe (1), comprising a retractable sheet (2); whose inner surface has a heat-sealable layer (3), is curved so that its two edges (la, lb) overlap, an adhesive tape (6), consisting of "nylon" retractable (4>   on the connecting face of which is formed a thermo-   sealable material (5), being applied to the inner face of the cover portion of the envelope sheet and   being heat sealed to this part.   2 reinforcement piece according to claim 1,   characterized in that the heat-sealable layers of the envelope sheet and the adhesive tape are formed polyethylene film.