Process and device for the manufacture of blisters with high barrier properties
AssigneeSwiss Aluminium Ltd.
InventorsWerner Festag, Hans-Ueli Muller
Life of this patent
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Abstract
The invention concerns a process and a device for manufacturing blisters with high barrier properties from a metal-plastic composite foil which can be deep drawn, in particular from an aluminum-plastic composite foil which is held fast in the clamping facility of a device for manufacturing blisters. In shaping the foil into one or more blisters, pressure is applied pneumatically or pneumatically and hydraulically to at least one side of the foil which stretches onto and over a lubricating layer or easy slip plate on the base of a die.
Claims16
Device for manufacturing blisters from metal-plastic composite foil which comprises a clamping facility including two separable parts between which a metal-plastic composite foil is firmly clamped, one part of which is a pressure resistant plate and the other part of which is a die having a base and a recess therein corresponding to the desired blister shape, wherein said pressure resistant plate includes at least one pressure supply line for supplying a fluid medium thereto for deforming said foil into said recess, said line connected to a closed chamber formed with the help of the foil held fast in the clamping facility, and said die being provided with a lubricating layer in the base thereof so that said foil is smoothly elongated or stretched into said recess and over said lubricating layer thereby obtaining improved blister volume and larger drawing ratio.
Device for manufacturing blisters from metal-plastic composite foil which comprises a clamping facility including two separable parts between which a metal-plastic composite foil is firmly clamped, one part of which is a pressure resistant plate and the other part of which is a die with a base, wherein said pressure resistant plate includes at least one pressure supply line for supplying a gaseous or gaseous and liquid medium thereto and connected to at least one closed chamber formed with the help of the foil held fast in the clamping facility, and said die being provided with a lubricating layer in the base thereof, wherein said layer is an easy slip plate which comprises a plastic plate with holes spaced apart at a predetermined distance and containing balls which can rotate freely.
Process for manufacturing blisters with high barrier properties from metal-plastic composite foil which can be deep drawn or stretched, which comprises holding said foil fast in a clamping facility including a recess corresponding to the desired blister shape and having a lubricating layer in the base thereof, said clamping facility also including a chamber opposed to said recess and closed in part by said foil, shaping said foil into said recess by the application of fluid pressure to said foil by a pressure supply line connected to said chamber, and elongating or stretching said foil into said recess and over said lubricating layer so that said foil is smoothly elongated or stretched into said recess and over the lubricating layer thereby obtaining improved blister volume and large drawing ratio.
Process for manufacturing blisters with high barrier properties from metal-plastic composite foil which can be deep drawn or stretched, which comprises holding said foil fast in a clamping facility including a recess having a lubricating layer in the base thereof, said lubricating layer comprising an easy slip plastic plate containing freely rotating balls, shaping said foil by the application of gaseous pressure or gaseous and liquid pressure to at least one side of the said foil, and elongating or stretching said foil into said recess and over said freely rotating balls.
Dependencies are inferred from the claim text.