摘要 |
A machine and method for making bags is described and includes a web , traveling from an input section to a rotary drum, to an output section. The rotary drum includes at least one seal bar, having a first sealing zone, and an adjacent weakening zone. The weakening zone may be a heated perforator, includes a heating wire, or be disposed to create an auxiliary sealed area. The heating wire can have, connected thereto, a source of power that is at an adjustable voltage or magnitude, and/or pulsed, and/or a feedback loop. The heating wire may be an NiCr wire and make intermittent contact with the web and be disposed in an insert. The weakening zone may create a line of weakness that is uniform or varies in intensity, is a separating zone, or includes a heat film, a toothed blade, a row of pins, a source of air, or a source of vacuum. The sealing zones may include temperature zones, cartridge heaters, cooling air, or heated air, or a source of ultrasonic, microwave or radiative energy. |
申请人 |
CMD CORPORATION |
发明人 |
JANSEN, THOMAS C.;WHITE, CHRISTOPHER LEE;RADTKE, KENNETH C.;STICKNEY, MICHAEL J.;SCHMOLL, BRADLEY J.;SELLE, PAUL A.;SAUDER, CHARLES H.;PRELLWITZ, GREGORY T.;LEITZKE, TERRY L.;SAUCIER, CHRISTOPHER A.;JOHNSON, PAUL A.;JOHNSON, ARVID R. |