Patent EA-002567-B1 (EA)
Title: Packing tray and method for its production and use
IPC: B65D77/20
Filed: 1999-09-15
Abstract: 1. A packing tray (2) substantially of cardboard, paper, or a laminate made, for example, by extrusion and based on cardboard or paper and in particular intended as sales packing for foodstuffs, such as meat, minced meat, sliced meat or vegetables, poultry, fish, fruit, vegetables, pasta, salads, dishes for dinner, bakery and dairy products, which tray preferably has a rectangular shape with rounded corner parts (8), a mainly plane bottom (14) and sloping side walls (16) which at the top continue in an annular edge (12) approximately extending in parallel with the bottom (14), charactarized in that the tray (2) consists of one press formed item, the upper side of which consist of a gas- and/or diffusion-proof coating having such barrier abilities that a covering film or a dome-shaped, e.g. transparent, lid (18) may be connected gas-proof or diffusion-proof to the said annular edge by welding, as said annular edge (12) at said rounded comer parts (8) is provided with a number of bending lines (10), and that the said coating has a certain minimum thickness being sufficient to ensure a smoothing and melting together of possible corrugations at said corner parts (8). 2. A packing tray (2) according to claim 1, characterized in that the said covering film is a so-called peelable film, i.e. a film which is exceptionally easy to remove from the annular edge (12) of the packing tray. 3. A packing tray (2) according to claim 1, characterized in that the sand dome-shaped lid is constituted by a correspondingly designed, inverted tray (2), which trays are welded together edge to edge. 4. A packing tray according to claims 1 - 3, characterized in that the tray (2), the lid (18) and possible paper laminated extruded covering film is provided with print. 5. A packing tray according to claim 1, characterized in that the tray (2) consists of one press formed item, the upper side of which between the cardboard and the upper weldable barrier coating being provided with a susceptor coating. 6. A packing tray according to claim 1, characterized in that the tray consist of one press formed item having form as a substantial round tray. 7. A packing tray according to claim 1, characterized in that the tray consist of one press formed item having form as a substantial elliptical or oval tray. 8. A method for production a packing tray according to claim 1 from a sheetor rollshaped cardboard material, which is laminated, coated or provided with a coating by extrusion, the surface coating of which material is weldable, characterized in that blanks [of material], the shape of which correspond to the packing tray, are punched out, that preferably at the same time a number of bending lines are embossed at corner parts of the blanks, and that these thereafter are press formed by means of a press forming tool, preferably a heated press forming tool. 9. A method according to claim 8, characterized in that there is used a material with an exceptionally thick surface coating which at the subsequent press forming by means of heat and friction ensures a smoothing and melting together of the bending lines at the corner parts of the annular edge at least. 10. Using a packing tray according to claim 1, for example as sales packing for foodstuffs, where one or more food item, e.g. a recently slaughtered chicken, is placed on the tray, characterized in that the foodstuffs are covered by a weldable, gasproof film which is welded to the annular edge of the packing tray, during simultaneous scavenging with a protective gas. 11. Using a packing tray according to claim 1, for example a sales packing for foodstuffs, where one or more food items, e.g. a portion of minced flesh or meat, is placed on the tray, characterized in that the foodstuffs are covered by means of a lid, e.g. a dome-shaped, transparent plastic lid which is welded to the annular edge of the packing tray, during simultaneous scavenging with a protective gas. 12. Using a packing tray according to claim 1, for example as sales packing for foodstuffs, e.g. prepared dinner dishes, where a portion of foodstuffs are placed on the tray, characterized in that the foodstuffs are covered by means of a dome-shaped lid consisting of a correspondingly shaped, inverted tray, and that the trays are welded together at the annular edge, during simultaneous scavenging with a protective gas.