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
Display for displaying three-dimensional images and method for displaying three-dimensional images
Methods for forming patterned structures
Molecular sieve
Heterogeneous language data typing without executable regeneration
Undercabinet plug-in mount
Keyswitch controller
Content display monitor
  Randomly Featured Patents
Portable device for deionizing liquids
Imaging device and driving method thereof
Software-based acceleration color correction filtering system
Invertible apparatus for molding a concrete panel
Wordline driver for semiconductor memory device
Seeding in a skill scoring framework
HEPA filter printhead protection
Horizontal continuous casting apparatus
Flush tank capable of receiving waste water
Non-contiguous memory location addressing scheme