| 摘要 |
<p>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 cardboard; 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 ).</p> |
