Patent ID: 7022058

Claim:
A method for manufacturing a multi-layer film for use in vacuum packaging applications, said multi-layer film including an inner layer having a plurality of grooves which operate to form channels suitable for evacuation of gas when said multi-layer film is used in the creation of a vacuum packaging bag, said method comprising the acts of: heat-extruding a first material directly onto a spinning cooling roll such that a patterned inner layer made of said first material is formed upon said spinning cooling roll, said patterned inner layer having a plurality of grooves which operate to form channels suitable for evacuation of gas from said vacuum packaging bag made of said multi-layer film, said plurality of grooves formed on said patterned inner layer in conjunction with a cooling of said first material; and feeding an outer layer onto said spinning cooling roll in conjunction with said extrusion and cooling of said first material such that said outer and inner layers laminate to form two layers of said multi-layer film, wherein said plurality of grooves are formed on a first surface of said patterned inner layer and a second surface of said patterned inner layer is laminated to said outer layer.