FR2839918A1 - Packaging material, for foodstuffs, has a polyethylene barrier layer between layers of compressed cardboard and absorbent paper with a corrugated surface - Google Patents

Abstract

The compound packaging material (1), especially for foodstuffs, is in three layers. A compressed cardboard layer (2) is covered by a layer of white polyethylene (4) and a layer of absorbent paper (3). The polyethylene layer acts as a humidity barrier, together with the adhesive to bond the layers together. The absorbent layer is a dried paper, with a corrugated surface (5).

Description

suitable.

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  The present invention relates to a complex material in a plate for the production of a packaging intended for any wet product or likely to release exudates, in particular for food products, such as fish, poultry, red meat, vegetables or the like. method of manufacturing this material, and also the packaging obtained from a plate of this complex material, suitably cut and rainee. Food products which are wet or liable to release exudates, such as meat or vegetable products in particular, are increasingly packaged in cardboard-based packaging, in particular to facilitate recycling of these packaging.

  and to limit the problems of environmental pollution.

  The packages in question may be in the form of a box, or

  still in the form of a tray wrapped in a plastic film.

  But the general structure of these packages is very often relatively complex, on the one hand to ensure a sufficient seal in order to avoid that liquids or exudates cannot escape from the packaging volume, and on the other hand to ensure [' absorption of these liquids or exudates, in particular so as to limit the

  propensity of bacteria to grow.

  The present invention provides a new multilayer material of simple structure and inexpensive allowing the production of packaging capable of ensuring in optimized conditions the packaging of such moist products or

  likely to release exudates.

  The sheet material according to the present invention consists of a superposition of three layers of material: a layer of compact cardboard, a layer of polyethylene and a layer of absorbent paper, said layer of polyethylene acting both as an anti barrier. - moisture and adhesive material to assemble the layer

  of cardboard and the paper layer absorb.

  The absorbent paper layer is preferably obtained by dry fly, in particular to limit the risks of tearing of the surface fibers by the

product (s) packaged.

  To improve its anti-slip power and ensure correct positioning of the product,

  this layer of paper advantageously has an embossed exterior surface.

  The polyethylene used is advantageously a white polyethylene

  so that the color of the compact cardboard does not stain that of the absorbent paper.

  According to a preferred embodiment, this complex material consists of: - a layer of compact cardboard whose grammage is between 250 and 500 g / m2,

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  a layer of polyethylene whose grammage is between 15 and 25 g / m2, and

  - a layer of absorbent paper whose grammage is between 40 and 60 g / m2.

  The invention also relates to the process for the manufacture of this particular material, which process consists in depositing by extrusion the polyethylene layer on a sheet of compact cardboard, in applying the absorbent paper layer to said polyethylene layer before drying of the latter, then press the multilayer complex

  obtained to secure the cardboard sheet to the sheet of paper.

  The invention also relates to the packaging obtained from a plate of this complex material, suitably cut and rainee. In this packaging, which can be in the form of a tray comprising a bottom element bordered by a belt of lateral walls, the internal face is constituted by the visible face of the absorbent paper. According to a particular embodiment, the packaging in question, in the form of a tray, comprises a rectangular bottom element bordered by two longitudinal walls and by two end walls connected in pairs by sealing bellows at the corners . The longitudinal walls have complete internal lining, and the end walls are extended by sidewalk elements intended to be positioned parallel to the bottom element once ['together

wrapped in plastic film.

  But the invention will be further illustrated, without being in any way limited, by the

  following description of a particular embodiment, given only by way of

  example and shown in the accompanying drawings in which: - Figure 1 is an enlarged view, in section, showing the superposition of the constituent layers of the complex material according to the present invention; - Figure 2 is a schematic view illustrating the method of manufacturing this complex material; - Figure 3 is a flat view of a blank of material cut from a plate of complex material according to the invention for obtaining a container-shaped packaging; - Figure 4 is a perspective view of the container obtained after volume of the blank of Figure 3; - Figure 5 shows the tray of Figure 4 wrapped in a plastic film. The plate material 1 illustrated in FIG. 1 consists of a layer of compact cardboard 2 and a layer of absorbent paper 3 assembled together by an intermediate layer of polyethylene 4 .;

  The compact cardboard preferably uses a grammage of between 250 and 500 g / m2.

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  The polyethylene layer which provides the connection between the sheets of cardboard 2 and of paper 3 forms a waterproof thickness which prevents the moisture absorbed by the sheet of paper 3

  cannot reach the layer of compact cardboard 2.

  The polyethylene used is preferably a white polyethylene, so as to mask the color of the compact cardboard; its grammage is advantageously understood

between 15 and 25 g / m2.

  The absorbent paper layer 3 is in the form of an assembly of fibers

aerated cellulosics.

  This absorbent paper is preferably obtained by dry fly, using binders for the assembly of fibers, so as to avoid or at least limit the possibilities.

  detachment or tearing of surface fibers by the packaged product (s).

  The texture of the absorbent paper chosen is adapted to ensure optimal absorption

  moisture; the grammage used is advantageously between 40 and 60 g / m2.

  On the other hand, the upper surface 5 of this absorbent paper is preferably embossed with

  way to optimize its anti-slip power.

  The general thickness of the multilayer material 1 can be between 0.5 and 2

  mm; this thickness is preferably close to 1 mm.

  As illustrated in FIG. 2, this complex multilayer material is produced by depositing, by an extrusion technique, the polyethylene layer 4 on a sheet of compact cardboard 2. The absorbent paper layer 3 is applied to the polyethylene layer 4 , before drying from behind, and the multilayer assembly 1 is subjected to a pressing operation, for example between a pair of pressing rollers 6, to

  secure the cardboard with the paper.

  This type of plate material is particularly well suited for the production of packaging in the form of trays intended for the packaging of products associated with small quantities of liquids, for example wet food products or likely to produce exudates, such as vegetables or products. carnes (red meat,

fish, poultry ...).

  The blank of material 7 illustrated in FIG. 3 has been cut from a plate of multilayer material 1 in accordance with the representation of FIG. 1. This blank of material 7 allows the packaging tray 8 illustrated in FIG. 4 to be produced, in which the layer of compact cardboard 2 is placed outside, the layer of paper

  absorb 3 s7tendent internally.

  The blank of material 7 comprises a rectangular bottom element 9 bordered by two longitudinal walls 10 and by two end walls 11 connected at the

  angles by sealing bellows 12.

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  The outer edge of each longitudinal wall 10 is extended by a lining 13, and the outer edge of each end wall 11 is extended by a

sidewalk element 14.

  The mounting of this blank of material 7, in order to obtain the volume container 8 of FIG. 4, is achieved by joining the flaps 13 by bonding against the internal face of the longitudinal walls 10, and by bonding the sealing bellows 12 against

  the internal face of the end walls 11.

  The entire internal surface of the tray 8 is constituted by the absorbent paper layer 3. This paper layer 3 has the capacity to absorb well the liquids or exudates likely to come from the packaged product or products; these liquids or exudates are blocked inside the packaging volume by the watertight corners of the tray, and also by its constituent material incorporating a waterproof layer of polyethylene. Preferably, the doubling flaps 13 are secured to the longitudinal walls 10 simply by a few points of glue, so as to complete the absorption of liquids or exudates by the absorbent paper which covers the surfaces in contact with said surfaces.

  longitudinal walls 10 and said lining flaps 13.

  Once the product (s) are packaged in the tray, it can be

  wrapped in a plastic film 15, as illustrated in FIG. 5.

  The longitudinal walls 10 doubled by the flaps 13, and the sidewalks 14 which extend parallel to the bottom element 9 confer on the packaging obtained a very good

  particularly resistance to stacking.

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Claims (8)

- CLAIMS   1.- Complex material in plate for the realization of a packaging intended in particular for food products, characterized in that it consists of a superposition of three layers of material: a layer of compact cardboard (2), a polyethylene layer (4) and an absorbent paper layer (3), said polyethylene layer (4) acting as both a moisture barrier and an adhesive material   to assemble the cardboard layer (2) and the absorbent paper layer (3).   2.- Material according to claim 1, characterized in that it comprises a layer   absorbent paper (3) obtained by dry fly.   3.- Material according to any one of claims 1 or 27 characterized in that   that it comprises a layer of absorbent paper (3) whose external surface (5) is embossed.   4.- Material according to any one of claims 1 to 3, characterized in that   that it comprises a layer of polyethylene (4) of white color.   5.- Material according to any one of claims 1 to 4, characterized in that   that it consists of: - a layer of compact cardboard (2) whose grammage is between 250 and 500 gIm2 '- a layer of polyethylene (4) whose grammage is between 15 and 25 g / m2 , and - a layer of absorbent paper (3) whose grammage is between 40 and 60 glm2 6.- Method of manufacturing a complex material in plate according to one   any one of claims 1 to 5, characterized in that it consists:   - to deposit by an extrusion technique the polyethylene layer (4) on a sheet of compact cardboard (2), - to add the absorbent paper layer (3) on said polyethylene layer (4), before drying this behind, then - to press the multilayer complex (1) obtained to secure the cardboard (2) with the paper (3).   7.- Packaging obtained from a plate of complex material according to one   any one of claims 1 to 5, suitably cut and rainee, the   internal surface is constituted by the visible face of the absorbent paper layer (3).   8.- Packaging according to claim 7, characterized in that it is in the form of a tray comprising a bottom element (9) bordered by a belt of side walls (10, 11).   9. A container-shaped packaging according to claim 8, characterized in that it comprises a rectangular bottom element (9), bordered by two longitudinal walls. 6 283 991 8   (10) and by two end walls (11) connected in pairs at the corners by sealing bellows (12), said longitudinal walls (10) having internal linings (13), complete and said walls d 'ends (11) extending by sidewalk elements (14) intended to come to be positioned parallel to said bottom element (9) once bound together wrapped by a plastic film (15). 10.- Flan of material suitably cut and raine obtained from a   plate of complex material according to any one of claims 1a 5 and apse,   after setting in volume, to realize a packaging according to any one of claims 7 to 9.