FR2780706A1 - Wrapper for fresh food products - Google Patents

Abstract

The wrapper, designed to be heat-sealed, is made from two opaque strips (10) of a plastic-coated bleached craft paper n either side of a central transparent plastic strip (12). The opaque and transparent strips are joined together by heat-sealing, hot or cold adhesive bonding and have respective densities of 15 - 150 and 10 - 150 g/sq m.

Description

The present invention relates to a heat-sealable paper intended for

  the packaging of fresh products, as well as packaging using a

such paper.

  The invention relates more particularly to heat-sealable paper used for packaging products sold at retail, such as, for example, cut cheeses, meat and cold meats, fish, etc. These products are fatty and / or aqueous products. To be packaged, they are generally placed on a sheet of heat-sealable paper, which is folded so as to form a "slipper" in which the product is located. To ensure watertightness, the three free edges of the "bootie" are sealed using a device generally comprising

three heating bars.

  The materials used until now to package such products are composite materials having a layer of paper and a layer of heat-sealable synthetic material. These materials are opaque and therefore do not allow you to see the packaged products. To allow the identification of the product, it is known to stick a label on the packaging, this label usually also carrying the price of the packaged item. The identification is relatively discreet and it is not possible to distinguish by far which product is packaged in the packaging. The consumer, for example, cannot quickly distinguish in his

  refrigerator a product of another product.

  The present invention therefore aims to provide a packaging material in the form of a film which allows easy identification of the product packaged in a packaging made of this material. Preferably, this material will be compatible with existing devices allowing the heat sealing of composite packaging sheets. To this end, the invention provides a heat-sealable paper intended for the packaging of fresh products, the paper being covered by or mixed with a layer of waterproof and / or grease-resistant synthetic material. According to the invention, this paper has on a part of its surface a transparent window, while the rest of its surface is

opaque.

  In this way, packaging made with this paper allows very rapid identification, even from a distance, of the product packed in

said packaging.

  One embodiment of the paper according to the invention provides that it is made up of at least two strips of water and / or grease tight material, at least one of these strips being transparent. The material constituting the opaque part of the paper according to the invention is, for example, a complex material comprising a layer of paper, for example bleached kraft paper, and a layer of a material chosen from the set of materials comprising polyethylene, low density polyethylene (LDPE), polypropylene, polyvinylidene chloride (PVDC) and ethylene-vinyl alcohol copolymers

(EVOH).

  The transparent part of the paper according to the invention has for example a layer of polyethylene and / or a layer of paper

  cellulosic and / or a polypropylene layer.

  To make a paper according to the invention, one can for example connect the transparent part to the opaque part using a technique

  chosen from heat sealing, hot bonding and cold bonding.

  The opaque part of a paper according to the invention has for example a density of between 15 and 150 g / m2, while the transparent part of this paper has for example a density of

between 10 and 150 g / m2.

  To avoid the formation of fogging and to thereby make the identification of the packaged product more difficult, the paper according to the invention can be covered with a product limiting the appearance of fogging, in particular at

level of the transparent part.

  The present invention also relates to a heat-sealable packaging using a paper covered with or mixed with a layer of synthetic material waterproof and / or grease, in which the

  paper used is paper as described above.

  Figure 1 is a perspective view of a closed package containing a fresh packaged product, Figure 2 illustrates a method of manufacturing a packaging paper according to the invention, Figure 3 shows a top view of a sheet of paper packaging according to the invention, and

  Figure 4 illustrates a variant of the process of Figure 2.

  Figure 1 shows a package 2 in which there is a product 4 shown here in the form of three fish. The package 2 is formed from a sheet 6 folded back on itself so as to sandwich the product 4 to be packaged. To seal the packaging, a weld is made at the three free edges 8 of

sheet 6 folded.

  The sheet 6 comprises two strips 10 of opaque paper between which there is a strip 12 of transparent material. The sheet shown in Figure 3 shows an alternative embodiment in which

  an opaque strip 10 is located between two transparent strips 12.

  FIG. 2 illustrates a process making it possible to obtain a sheet 6 for producing the packaging 2 of FIG. 1. FIG. 2 shows three coils mounted coaxially next to each other. Two reels of opaque flat film 14 are separated from each other by a reel of transparent flat film 16. The three reels 14 and 16 are unwound. One or two-sided printing with integrated lacquering or with the use of prepainted material may be carried out on one or more of the three

unrolled films.

  To make the three films integral, a thermal weld is performed at the neighboring edges of two adjacent films, or else a

  hot laminating or even cold laminating.

  This process can be carried out in a single or in several phases. Window paper is thus obtained which can be presented flat or on a roll. Of course, the film obtained can be cut to length to

  make individual sheets.

  The opaque film used is made of a complex material comprising a layer of bleached kraft paper and a layer of low density polyethylene (LDPE). Of course, another type of paper can be used and the LDPE can be replaced by another synthetic material such as for example polypropylene, another type of polyethylene, polyvinylidene chloride (PVDC) or a copolymer.

  ethylene vinyl alcohol (EVOH).

  Instead of having a complex material having two distinct layers, it is possible to use a mono-material in which are mixed a virgin paper pulp plus a lacquer or a coating of a welding agent. The surface mass, or grammage, of this heat-sealable paper is for example between 15 and

g / m2.

  The film used to make a transparent strip 12 can be

  made of a single material or can be a complex material.

  As mono-material, it is possible, for example, to use polypropylene or polyethylene. It is also conceivable to use a complex material using these two products. A complex material may also

  have a layer of cellulose paper.

  The surface mass, or the grammage of this transparent film is for example between 10 and 150 g / m2. The thickness of this film is

  then between about 3.7 trm (microns) and 55! im (microns).

  To prevent fogging on the transparent part of the package 2, it is possible to provide a coating of a product limiting the appearance of fogging. Such a product is of chemical composition

  complex and is known to those skilled in the art.

  Figure 4 shows an alternative embodiment of a sheet according to the invention. The method illustrated here is similar to the method illustrated in Figure 2 but here only two coils, a coil 14 of opaque film and a coil 16 of transparent film are used. We then obtain a sheet 6 not shown formed of two strips, a transparent strip

and an opaque band.

  The drawing shows opaque bands 10 and transparent bands 12 of substantially equal widths. This is a preferred embodiment. However, it is entirely possible to have

  opaque and transparent bands of entirely different widths.

  In general, wrapping papers for fresh produce, of the type described above, have a width of 350 to 500 mm. The paper according to the invention will advantageously have the same dimensions, but

  wider or narrower paper would not depart from the scope of the invention.

  Depending on the product for which it is intended, the paper according to the invention may have a window of greater or lesser width. A width between 30 and 50% of the total width of the paper generally allows the contents of the packaging to be clearly seen. However, we can consider larger or lower proportions for the

  width of the transparent window.

  A packaging produced with paper according to the invention makes it possible to see and identify the packaged product or products. This is a significant advantage for the consumer. Indeed, when several products packaged separately are packed in a refrigerator each in an opaque paper of the prior art, it is difficult to quickly know which product is in which packaging. Thanks to the paper according to the invention, it is possible to produce a packaging allowing

  quickly identify the packaged product.

  A product wrapped in paper according to the invention can without

  problem be refrigerated or frozen.

  A packaging according to the invention respects the traditional side of the product. The opaque parts of the packaging allow presentation and

product information.

  Like the packaging of the prior art, the packaging

  according to the invention is waterproof and / or grease-proof.

  The packaging according to the invention can be used in the sale of retail products but it is also possible to envisage using it for the

  sale of preconditioned fresh products.

  It goes without saying that the invention is not limited to the embodiments described above by way of nonlimiting examples; on the contrary, it embraces all variants within the framework of

claims below.

Claims (9)

  1. Heat-sealable paper intended for the packaging of fresh products (4), the paper being covered by or mixed with a layer of synthetic material which is waterproof and / or grease-proof, characterized in that it has on one part from its surface a transparent window (12), while the rest of its surface (10) is opaque. 2. Paper according to claim 1, characterized in that it consists of at least two strips (10,12) of waterproof material   and / or greases, at least one (12) of these bands being transparent.   3. Paper according to one of claims 1 or 2, characterized in   that the material constituting its opaque part (10) is a complex material comprising a layer of paper, for example bleached kraft paper, and a layer of a material chosen from the set of materials comprising polyethylene, low polyethylene density (LDPE), polypropylene, polyvinylidene chloride (PVDC) and copolymers   ethylene vinyl alcohol (EVOH).   4. Paper according to one of claims 1 to 3, characterized in   that its transparent part (12) has a layer of polyethylene and / or a layer of cellulose paper and / or a layer of polypropylene.   5. Paper according to one of claims 1 to 4, characterized in   that the transparent part (12) is connected to the opaque part (10) using a technique chosen from heat sealing, hot gluing and cold bonding.   6. Paper according to one of claims 1 to 5, characterized in   that the opaque part (10) has a density between 15 and g / m2.   7. Paper according to one of claims 1 to 6, characterized in   that the transparent part (12) has a density of between 10 and 150 g / m2.   8. Paper according to one of claims 1 to 7, characterized in   that it is covered with a product limiting the appearance of fogging, in particular   at the transparent part (12).   9. Heat-sealable packaging (2) using a paper covered with a layer of waterproof and / or grease-proof synthetic material, characterized in that the paper used is a paper according to one of claims 1 to 8.