A method for producing a heat-sealable packaging material, in which both sides of a fibrous substrate are equipped with a polymer heat-sealing layer, characterized in that high-density polyethylene is extruded on both sides of the fibrous substrate (5). The (HDPE) polymer water vapor barrier layer (2, 9) is such that the water vapor barrier layer is held between the fibrous substrate in the packaging material and the outer heat seal layer (1, 10).
The invention relates to a method for preparing a heat-sealable packaging material, a polymer-coated packaging material prepared by using the method, and a sealed package prepared from the material. The packaging material comprises: a fibrous substrate, such as a packaging sheet (5), and an inner, extruded water vapor barrier (2, 9) on both sides thereof, which contains a high-density polyethylene (HDPE), and The heat seal layer (1, 10) is made of, for example, low density polyethylene (LDPE). In addition, the polymeric oxygen barrier layer (7) may be incorporated in a packaging material, such as ethyl vinyl alcohol copolymer (EVOH) or polyamide (PA). By the HDPE layer, the penetration of water vapor in both directions is prevented, and curling of the material in the position of the extrusion layer on both sides of the fiber substrate is reduced. The package according to the invention comprises: box-type, box-type and bag-type packages for dry and liquid foods.
The invention relates to a method for preparing a heat-sealable packaging material, a polymer-coated packaging material prepared by using the method, and a sealed package prepared from the material. The packaging material comprises: a fibrous substrate, such as a packaging sheet (5), and an inner, extruded water vapor barrier (2, 9) on both sides thereof, which contains a high-density polyethylene (HDPE), and The heat seal layer (1, 10) is made of, for example, low density polyethylene (LDPE). In addition, the polymeric oxygen barrier layer (7) may be incorporated in a packaging material, such as ethyl vinyl alcohol copolymer (EVOH) or polyamide (PA). By the HDPE layer, the penetration of water vapor in both directions is prevented, and curling of the material in the position of the extrusion layer on both sides of the fiber substrate is reduced. The package according to the invention comprises: box-type, box-type and bag-type packages for dry and liquid foods.
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