Double funnel bag material and method, wherein continuous length plastic film material is formed into a plurality of coextensive funnel strips connected together as formed. Each of the funnel strips is provided along an edge which is remote from the edge connection with the companion strip, with a zig-zag...http://www.google.com/patents/US4651504?utm_source=gb-gplus-sharePatent US4651504 - Double funnel bag material and method
