Method of producing a heat-resistant polymer-coated oven board, an oven board obtainable by the method, a food tray and a food package
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United States of America Patent
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Apr 28, 2020
Grant Date -
Feb 2, 2017
app pub date -
Apr 14, 2015
filing date -
Apr 16, 2014
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Abstract
The invention covers a method of producing a heat-resistant polymer-coated oven board, the resulting oven board, a food tray and a food package, which comprise such board and withstand heating in a range or microwave oven. According to the invention the coated oven board (1) is made by adhering a premade heat-resisting film (4) comprising polyethylene terephthalate (PET) or its derivate, such as glycol-modified PET known as PETG, to a board base (2) by extrusion lamination, in which an adhesive layer (3) comprising polyamide (PA) is extruded between the heat-resisting film and the board base. To improve the strength and barrier properties, the film (4) may be an extruded multilayer film and/or the film may be stretch-orientated to bring about crystallization in PET.
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