Patent ID: 8409676

Claim:
A method of manufacture of an environmentally friendly beverage preparation package comprising the steps of: providing a single compostable sheet material comprising an outer compostable outer substrate layer having an inner side that includes a first sealable layer on the inner side of the substrate layer and a second sealable layer overlaying the first sealable layer, wherein the first and second sealable layers provide a core of a high-melting-point and a surface layer of a lower melting point, the sheet material having a top, bottom and side edges; placing two webs of the compostable sheet material together with the second sealable layers in a face-to-face relationship; inserting a nozzle between the top edges of the sheet material wherein the nozzle is configured for injecting liquid into the package interior and pressurizing the beverage preparation package; forming the beverage preparation package by sealing the top, bottom and side edges of the sheet material together to form seams in which the nozzle is sealed between the two sheets of compostable material and the top and side edges are bonded together with a high sealing strength using temperatures higher than 160° C. and the bottom seams are bonded with a low sealing strength using temperatures of about 100° C. to 150° C.; wherein the bottom seams, bonded with a low sealing strength, allow for separation of the sheets when the interior of the beverage preparation package is pressurized.