A sheet laminate, a blister package and a method of manufacture

A sheet laminate for being used as a puncturable top web for a blister package, comprising:

• an aluminum base sheet layer;
• at least one tie layer comprising polyolefin;
• a welding layer comprising polyester or polypropylene;
• wherein the welding layer and the tie layer are coextrusion coated on the base sheet layer so that the at least one tie layer is disposed between the base sheet layer and the welding layer, whereby the welding layer is attached to the base sheet layer by the at least one tie layer.

A blister package comprising:

• a sheet laminate provided as a top web of the blister package, which sheet laminate comprises:
• an aluminum base sheet layer,
• at least one tie layer comprising polyolefin,
• a welding layer comprising polyester or polypropylene,
• wherein the welding layer and the tie layer are coextrusion coated on the base sheet layer so that the at least one tie layer is disposed between the base sheet layer and the welding layer, whereby the welding layer is attached to the base sheet layer by the at least one tie layer;
• a blister package bottom web comprising cavities;
• one or more products for consumption disposed in one or more of said cavities;
• wherein the top web is arranged with a bottom surface of the welding layer facing and welded to a welding surface of the bottom web, said welding surface surrounding said cavities.

A method for manufacture of a sheet laminate comprising:

• providing an aluminum base sheet layer;
• and
• coextrusion coating at least one tie layer and welding layer onto said aluminum base sheet layer, so that the tie layer is disposed between the base sheet layer and the welding layer, whereby the welding layer is attached to the base sheet layer by the tie layer;
• wherein the at least one tie layer comprise polyolefin and the welding layer comprises polyester or polypropylene.