Abstract: The invention relates to a method for top sealing a cardboard tray lined with a plastic foil.

Abstract: A clamshell packaging for airtight packaging of foodstuff includes a tray folded out of a single sheet. The tray has at least two adjacent pool parts, each pool part having a bottom wall and upstanding walls arranged around the circumferential edge of the bottom wall. The adjacent pool parts are hingedly connected to each other along an upper edge of a respective upstanding wall, so the adjacent pool parts can be hinged on top of each other to form a closed box. A circumferential, horizontal flange is arranged to the tray to at least some upper edges of the upstanding walls. A plastic barrier foil is arranged in the pool parts and extends onto and substantially covers the flange. The flange includes a seal zone extending along the length of the flange. The seal zone is line symmetrical along the hinge line at the upper edge of the connected walls.

Abstract: A packaging for modified atmosphere packaging includes a flangeless cardboard tray having a bottom and an upstanding peripheral wall. A plastic flange is arranged on top of the edge of the peripheral wall. The plastic flange has in cross-section a first part extending horizontally, substantially parallel to the bottom of the tray, a second part depending from the first part downward along the outside of the peripheral wall and a third part depending from the first part, opposite of the second part, along the inside of the peripheral wall. A plastic barrier foil is adhered to and lines the inside of the cardboard tray and extends over the plastic flange to fix the plastic flange onto the flangeless cardboard tray.

Abstract: A method for manufacturing an object, such as a tray includes providing an unfolded sheet; providing a straight score line in the unfolded sheet for providing a division between a wall part and a flange part; folding the flange part of the sheet relative to the wall part along the score line to provide an angle larger than 45° between the flange part and the wall part; providing a plastic foil; heating the plastic foil; pressing the heated foil on the sheet at the side provided with the score line and covering at least part of the wall part and the flange part; the sheet having at least one U-shaped cut interrupting the score line. The free ends of the U-shaped cut are positioned on the score line. The bridging part of the U-shaped cut is positioned in the flange part.

Abstract: The invention relates to a method for providing a packaging for modified atmosphere packaging, which method comprises the steps of: providing an unfolded sheet for folding a box; folding the unfolded sheet to a box having at least an access opening and flange parts bordering the access opening, which flange parts compose an endless circumferential flange; providing a plastic foil; heating the plastic foil; pressing the heated plastic foil against the inner wall of the box and covering the circumferential flange, such that the plastic foil is laminated to box. The invention further relates to a packaging.

Abstract: Method for arranging a foil in a tray, comprising: providing a tray (1) having a bottom, an upright wall, a tray opening and a circumferential outwardly extending flange composed out of at least two abutting portions; providing a foil (7) having at least dimensions corresponding with the outer dimensions of the flange; heating a central zone (15) of the foil; urging the heated central zone of the foil against the bottom, the upright wall and at least partially over the flange, wherein the edge of the heated central zone runs over the interfaces of abutting portions. Intermediate product with a foil lying loose over a flange of the tray. Device comprising a mold (5) for receiving a tray (1), means for arranging a foil (7) over the mold, heating means comprising a plate which is arranged over the mold for heating the foil and means for urging the foil in the mold.

Abstract: The invention relates to a method for providing a packaging for modified atmosphere packaging, which method comprises the steps of: providing an unfolded sheet for folding a box; folding the unfolded sheet to a box having at least an access opening and flange parts bordering the access opening, which flange parts compose an endless circumferential flange; providing a plastic foil; heating the plastic foil; pressing the heated plastic foil against the inner wall of the box and covering the circumferential flange, such that the plastic foil is laminated to box. The invention further relates to a packaging.