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
Trading related to fund compositions
Method and apparatus for allocating erasure coded data to disk storage
Wrench head
Plants and seeds of hybrid corn variety CH979678
Method and assembly for determining the temperature of a test sensor
Method of driving stereoscopic display apparatus and stereoscopic display apparatus
  Randomly Featured Patents
Sport bag
Booster seat
Battery adapter
Twin-disc brake having axially sliding calipers
Fractionation of phenol formaldehyde condensate and photoresist compositions produced therefrom
Modified chess set and method of playing a modified game of chess
Radio base station, user device, and method used in mobile communication system
Piezoelectric fuel injection system with rate shape control and method of controlling same
Manifold structure for pressure molding
Fuel shutoff valve