Abstract: The disclosure relates to a method of producing a blank (50a, 50b) of thermosealable and creased packaging laminate for a microwave-friendly packaging container, comprising the steps of: (a) advancing a continuous web (1) of a base laminate (10) in a conversion line for the packaging laminate so that continuous blanks for said packaging containers are oriented with their top-to-bottom direction transversely of the machine direction of the conversion line and with a top-to-bottom interface (51), (b) providing said base laminate (10) with creases and cutting into said blanks (50a, 50b) of the packaging laminate, a continuous strip (2) of a material which conducts heat and electricity being applied in the machine direction in a region over said top-to-top/bottom interface (51) and in conjunction with step (a), and an elongate opening indication (53) being provided, before or after the application of the strip (2) so that the opening indication is positioned within the region of said strip.

Abstract: The present invention relates to a method of heating a package, comprising the steps of: placing a number of packages in a retort, pressurising the retort to a first pressure by the supply of a gaseous pressurisation medium of low moisture content, supplying a heating medium for heating the package and the product packed in the package, raising, in connection with the supply of the heating medium, the pressure in the retort to a second pressure, and, during the final phase of the heat-treatment, reducing the pressure in the retort in such a manner that the pressure of the product packed in the package is higher than or equal to the pressure prevailing in the retort outside the package.

Abstract: The disclosure relates to a method of producing a blank (50a, 50b) of thermosealable and creased packaging laminate for a microwave-friendly packaging container, comprising the steps of: (a) advancing a continuous web (1) of a base laminate (10) in a conversion line for the packaging laminate so that continuous blanks for said packaging containers are oriented with their top-to-bottom direction transversely of the machine direction of the conversion line and with a top-to-bottom interface (51), (b) providing said base laminate (10) with creases and cutting into said blanks (50a, 50b) of the packaging laminate, a continuous strip (2) of a material which conducts heat and electricity being applied in the machine direction in a region over said top-to-top/bottom interface (51) and in conjunction with step (a), and an elongate opening indication (53) being provided, before or after the application of the strip (2) so that the opening indication is positioned within the region of said strip.

Abstract: The disclosure relates to a packaging laminate for a retortable packaging container comprising a core layer (11), outer, liquid-tight coatings (12 and 13) and a gas barrier (14) disposed between the one coating (12) and the core layer (11). Between the gas barrier (14) and the core layer (11), there is a layer (16) of a lamination or sealing agent of such a nature that the lamination or sealing agent has a melting point which is higher than the maximum temperature to which the retortable packaging container is to be subjected during a normal heat treatment in a retort. The lamination or sealing agent in the layer (16) may, for example, be a polypropylene with a melting point of above 130° C.

Abstract: The present invention relates to a method of heating a package, comprising the steps of: placing a number of packages in a retort, pressurising the retort to a first pressure by the supply of a gaseous pressurisation medium of low moisture content, supplying a heating medium for heating the package and the product packed in the package, raising, in connection with the supply of the heating medium, the pressure in the retort to a second pressure, and, during the final phase of the heat-treatment, reducing the pressure in the retort in such a manner that the pressure of the product packed in the package is higher than or equal to the pressure prevailing in the retort outside the package.

Abstract: The disclosure relates to a packaging laminate for a retortable packaging container comprising a core layer (11), outer, liquid-tight coatings (12 and 13) and a gas barrier (14) disposed between the one coating (12) and the core layer (11). Between the gas barrier (14) and the core layer (11), there is a layer (16) of a lamination or sealing agent of such a nature that the lamination or sealing agent has a melting point which is higher than the maximum temperature to which the retortable packaging container is to be subjected during a normal heat treatment in a retort. The lamination or sealing agent in the layer (16) may, for example, be a polypropylene with a melting point of above 130° C.

Abstract: A container is manufactured by means of folding and sealing, and is intended to be used in extremely humid conditions, such as in an autoclave or in a cooling tunnel. The container has at least one liquid absorbing layer and all the cut edges of the container are protected.

Abstract: The invention relates to a method for fastening a barrier layer to an adjacent laminate layer in a package material. The fastening is performed by a partial adhesive being achieved in a first step and is completed by means of heat treatment in a subsequent step.

Abstract: A package container fabricated from plastic-coated packaging material includes an upper end wall and a sealing fin that extends across the upper end wall of the container. The sealing fin includes mutually facing material layers between which is located an opening strip. The opening strip includes an inner layer positioned between outer layers that are sealed to plastic coatings of the packaging material, and an intermediate layer positioned between the inner layer and each of the outer layers. The intermediate layer is fabricated from a material whose properties are such that the adhesive bonding strength between all material layers of the opening strip and between the outer layers of the opening strip and the plastic coating of the packaging material is greater than the internally cohesive bonding strength of the intermediate layer.

Abstract: A method of heating a portion of a continuous material strip includes heating the web through use of one or more IR lamps provided with radiation-concentrating reflectors. The IR lamps are directed towards a restricted area on the web to thereby heat the thermoplastic surface in the restricted area to a temperature that corresponds to the melting temperature of the thermoplastic. The web can be provided with a color strip in the restricted area, whereby the color strip absorbs the heat from the IR lamps.

Abstract: Packing containers manufactured from plastic-coated paper and having a sealing fin wherein the packing material is joined inside-to-inside in a sealed union, the material layers so joined together accommodating between them, at least along a part of the sealing fin, a tearing strip inserted in the sealing fin which is sealed to the inner plastic coating of the packing material. To facilitate the pulling off of the tearing strip on opening of the container, the packing material is provided at least within the region of the part of the sealing fin accommodating the strip with a material layer adapted to weaken adherence which is applied between the fibrous layer and the inner plastic coating of the packing material and preferably consists of water glass.

Abstract: An opening arrangement on a packing container of the type which comprises a pouring opening 6 formed in the upper side of the container. The opening arrangement comprises a cover strip 8 and a pouring edge strip 7 arranged between the cover strip 8 and the packing container. To make possible the reclosure of the pouring opening 6 the cover strip 8 is provided with a gripping strip 9' sealed to its underside which preferably has a free gripping edge 9" facilitating the hooking of the cover strip 8 to the pouring tab 7.

Abstract: The invention relates to a packing laminate web with a protective layer which is applied during the manufacture of the laminate web to one, sterile side of the web. When the laminate web is to be converted to aseptic packing containers the protective layer is detached and is transferred to the opposite side of the laminate web where it serves as an external plastic layer. The invention also comprises a method for the manufacture and conversion of the packing laminate web.

Abstract: The invention relates to an opening arrangement on parallelepipedic packing containers of the type which include a sealing fin extending over the top end wall of the packing container and a longitudinal overlap joint which crosses the sealing fin. In the region of the sealing fin arranged between a crossing point and a tip of a triangular lug, which is connected with the top end wall of the packing container, a strip is provided which includes a central portion of a non-extensible or only slightly extensible, material and outer coverings of thermoplastic. These outer coverings, upon sealing of the fin, will fuse together with an inner plastic covering of the packing material in the fin. The packing container is adapted to be opened by upwardly pulling a part of the strip projecting at the crossing point, so that the central layer of the strip is detached from the outer coverings to form an emptying channel.