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
Systems and methods to provide communication history for communication devices
Vacuum cleaner
Method and apparatus for managing network traffic
Multifunction switch for vehicle having lighting module
Meter socket cabinet
Liquid crystal display apparatus
Method for detection and characterization of a microorganism in a sample using time-dependent intrinsic fluorescence measurements
  Randomly Featured Patents
Line filter
Power tool with measurement of a penetration depth of a working tool
System and method for stereo digital audio compression with co-channel steering
Hydrolytically stabilized polarizer
Optically imaged recording apparatus
Delosperma plant named `Jewel of Desert Ruby`
Patterning process
Turret type yarn winder
Bar code scanner and method of programming
Non-detachable end unit