Multilayer heat-sealable packaging material, a food package...

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 81/30 (2006.01) B32B 27/10 (2006.01) B32B 27/20 (2006.01) B65D 65/40 (2006.01)

Patent

CA 2405286

The invention relates to a multi-layer heat-sealable packaging material especially for food packages. In addition, objects of the invention are a food package formed of the said packaging material, a method of packaging, and the use of the material for packages. The packaging material (1) comprises a middle layer (3) of fibre material, such as carboard; at least one polymeric protective layer (4, 5) protecting the product from going bad; and polymeric heat sealing layers (2, 7) preferably on both sides of the packaging material. According to the invention, the heat sealing layer (7) forming the inner surface of the closed package, is blended with light-absorbing pigment, such as carbon black, for protecting the product from visible light. By further blending white pigment, such as titanium dioxide, into the heat sealing layer (7), a grey tint resembling an aluminium foil has been achieved for the layer. The heat sealing polymer may be low-density polyethylene (PE-LD), and an oxygen and aroma proof sealing layer (4) of, for example, ethylene vinyl alcohol copolymer (EVOH) or polyamide (PA) may be provided between it and the cardboard (3).

L'invention concerne un matériau d'emballage thermoscellable multicouche notamment destiné à l'emballage d'aliments. L'invention concerne, en outre, des objets, tels que des emballages pour aliments, fabriqués à partir dudit matériau, un procédé d'emballage, et l'utilisation de ce matériau dans des emballages. Ce matériau d'emballage (1) comprend une couche centrale (3) de matériau fibreux, tel que du carton, au moins une couche polymère de protection (4, 5) protégeant le produit du dépérissement, et des couches polymères thermoscellantes (2, 7), de préférence, sur les deux faces du matériau d'emballage. Selon l'invention, la couche thermoscellante (7) formant la face intérieure de l'emballage fermé, est comêlée avec un pigment absorbeur de lumière, tel que du noir de carbone, afin de protéger les produits de la lumière visible. En comêlant du pigment blanc, tel que du bioxyde de titane, dans la couche thermoscellante (7), un voile gris ressemblant à une feuille d'aluminium a été créé pour la couche. Le polymère thermoscellant peut consister en un polyéthylène basse densité (PE-LD), et une couche isolante destinée à conserver l'arôme les produits et à les protéger de l'oxygène, par ex., en copolymère d'éthylène alcool de vinyle (EVOH) ou en polyamide (PA) peut être placée entre ce polymère et le carton (3).

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