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
Harmonic sensor
Shower bench
Herbicide composition having improved effectiveness, method of preparation and use
Pickup device and method for manufacturing the same
Production of battery grade materials via an oxalate method
Perception-based artifact quantification for volume rendering
Activated carbon cryogels and related methods
  Randomly Featured Patents
Electronic device with illumination circuit and EL device utilizing the same
Portable power cleaning system
Vehicle sound synthesizer
Ear lobe clip with heart beat sensor
Neutrally buoyant submerged system using lesser density ballast fluid
Radiation detecting apparatus, and radiation image pickup system
Convertible selector switch
Copy sheet-feeding apparatus
Measuring method and device for determining a pumping characteristic or a parameter of a fluid
Lighting fixture