Heat-sealing packaging material for coating polymer, manufacturing method and sealing package

Patent Name: Heat-sealable packaging material coated with a polymer, method of manufacture, and sealed package Patent applicant Stano Aesop O. Co., Ltd. Principal applicant Address Inventor T. Pentinen, Helsinki, Finland; K. Neiva Lai Ning; J. Yervinen Application (Patent) No. 02814086.9 Date of Application 2002.07.12 Certification Date Approval Notice No. 1527765 Audit Notice Date 2004.09.08 Manual CD-ROM D0436 Main Classification Number B32B27/10 Classification Number B32B27/10; B65D65 /40 Subsequent to the original application Serial number Abstracts This invention relates to a process for the preparation of a heat-sealable packaging material, a polymer-coated packaging material prepared using this 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. Sovereignty 1. A method of manufacturing a heat-sealable packaging material in which both sides of a fibrous substrate are provided with a polymer heat-sealing layer characterized by extruding on both sides of the fibrous substrate (5). High-density polyethylene (HDPE) polymer water vapor barrier (2, 9) so that the water vapor barrier layer is held in the packaging material in the fiber substrate and the outer heat seal layer (1, 10) between.