Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Wall flow type exhaust gas purification filter
Flexible circuit routing
Air-fuel ratio control apparatus for an internal combustion engine
Prioritizing application data for transmission in a wireless user device
Image processor
Electronic device
Authentication method
  Randomly Featured Patents
Hair dressing accessory for a hair dryer appliance
Photomask and pattern forming method employing the same
Motor-driven power steering apparatus
Cost effective measurement of high currents
Shoe upper
Double rabbet combustor mount
Multi-use collapsible sun-shade tent
Biodegradable sanitary disposable tub liner
Tape cassette having outer and inner lids locked by the inner lid
Retainer-equipped roller