Heat-sealed sterilised product package, packaging material...

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 65/40 (2006.01) B32B 27/10 (2006.01) B32B 27/20 (2006.01) B65D 5/56 (2006.01) B65D 81/24 (2006.01) B65D 81/30 (2006.01) B65D 81/34 (2006.01)

Patent

CA 2513151

The invention relates to a polymer-coated heat-sealable packaging material, to a heat-sterilised package formed from this and to the use of the packaging material. The material comprises a fibre base ( 4), which is e.g. a packaging board made of bleached pulp, and polymer heat-seal layers (1, 9) located on both sides of this. In accordance with the invention, the package comprises, outside the fibre base, a polymer coating layer (2), which contains white pigment for covering the fibre base from sight, and a second coating layer (8), which contains light-absorbing pigment. A coating layer pigmented grey inside the fibre base, for instance, provides a light shield for the packaged product. The absorbent black pigment may also be located outside the fibre base underneath a white layer in order to stabilise the brightness of the material. The package may be e.g. a food package heat-sterilised in an autoclave, in which yellowing of the fibre-based material has been avoided by means of a white pigment.

L'invention concerne un matériau d'emballage thermoscellable à revêtement polymère, un emballage thermo-stérilisé formé à partir de ce matériau et l'utilisation dudit matériau d'emballage. Ce matériau comprend une base fibreuse (4) constituée par exemple d'un carton d'emballage fait de pâte blanchie et des couches polymères thermoscellables (1, 9) disposées de part et d'autre du carton. Selon cette invention, l'emballage comprend, hors de la base fibreuse, un couche de revêtement polymère (2) contenant un pigment cachant la couche fibreuse, et une seconde couche (8) renfermant un pigment absorbeur de lumière. Une couche de revêtement pigmentée en gris à l'intérieur de la base fibreuse, par exemple, protège le produit emballé contre la lumière. Le pigment noir absorbant peut également se trouver hors de la base fibreuse, sous une couche blanche et stabiliser l'éclat du matériau. L'emballage peut être utilisé notamment pour des produits alimentaires stérilisés à la chaleur en autoclave, le jaunissement du matériau fibreux de base étant empêché grâce à un pigment blanc.

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