Resources Contact Us Home
Method and apparatus for making skirtless seals

Image Number 4 for United States Patent #8029428.

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 single sealing zone, and a weakening zone disposed within the single sealing zone. The single sealing zone may be a heated perforator, and may include a heating wire. The heating wire may be an NiCr wire stitched into the heater, and be disposed on a cap or on the seal bar. The weakening zone may create a line of weakness that is uniform or varies in intensity. The sealing zone may include temperature zones, cartridge heaters, cooling air, or heated air, or a source of ultrasonic, microwave or radiative energy.

  Recently Added Patents
Passive millimeter wave differential interference contrast polarimetry
Efficient file system metadata scanning using scoped snapshots
Electronic component and a system and method for producing an electronic component
Functionalized main chain polymers
Nonvolatile memory device
Bio-stimulant for improved plant growth and development
Method and apparatus for eliminating a motor vehicle tip-over risk
  Randomly Featured Patents
Communication module and method for connecting an electrical device to a network
Apparatus for cooling strip like material
Image processing system for judging whether a partial job should be processed by an own device or another device
Method of lubrication of conduits for cementitious slurries
Biodegradable polymers, the production thereof and use thereof for producing biodegradable moldings
Supporting structure for a thickness-shear type crystal oscillator for watches
Benzodiazepin derivatives useful as CCK-receptor antagonists
Method of removing paper adhered to a surface
Stamp such as a postage stamp and a method for producing it