Abstract: A process and apparatus for forming a seal between a filter cartridge wall and a pleated filter disposed within the cartridge having a support for rotating the cartridge. A nozzle is connected to a source of sealant for injecting sealant into an area between the wall of the cartridge and the filter media. A valve connected to the nozzle valves sealant to the nozzle and has a draw back feature after a desired amount of sealant is injected. The method for sealing the filter media to the wall of the cartridge includes rotating the filter cartridge while disposing a nozzle into the interior of the cartridge and injecting a sealant through the nozzle controlled by a valve. The valve draws flow backwardly from the nozzle at the termination of the injection of sealant.

Abstract: A process and apparatus for forming a seal between a filter cartridge wall and a pleated filter disposed within the cartridge having a support for rotating the cartridge. A nozzle is connected to a source of sealant for injecting sealant into an area between the wall of the cartridge and the filter media. A valve connected to the nozzle valves sealant to the nozzle and has a draw back feature after a desired amount of sealant is injected. The method for sealing the filter media to the wall of the cartridge includes rotating the filter cartridge while disposing a nozzle into the interior of the cartridge and injecting a sealant through the nozzle controlled by a valve. The valve draws flow backwardly from the nozzle at the termination of the injection of sealant.

Abstract: A face mask for filtering airborne particles formed by an upper portion adapted for placement over a user's nasal area and a lower portion adapted for placement over a user's oral area. Ribs are formed ultrasonically extending along the length of the upper portion, and a pair of ears are formed at either end having openings therethrough to receive a plastic strap for passing through the openings of the ears to secure the mask to a user's face. The mask is formed by layers of plastic material including scrim and filtration material forming the upper and lower portions that have been ultrasonically bonded together. A process for making the mask includes providing plastic fabric layered materials that are ultrasonically welded with a plurality of ribs and slitting and sealing them to form two portions. The two portions are fed in overlying sandwiched relationship to each other and scored for the ears while at the same time welding them together to form an upper and lower portion of the mask.