An apparatus for manufacturing easy-to-open bags comprising a pair of feed rollers, at least one puncher disposed downstream of said feed rollers, upper and lower separating rollers disposed downstream of said puncher, tear string positioning member disposed downstream of said separating rollers, heat...http://www.google.com/patents/US4725329?utm_source=gb-gplus-sharePatent US4725329 - Apparatus for manufacturing easy-to open synthetic resin bag
