Patent ID: 8348247
Filing Date: 2013-01-08
Classification: B01F,B26F,B29C,B29K,B29L,B65H,F16L

Abstract:
1. A method of manufacturing a flexible tubing for fine bubble aeration, comprising: providing a raw tubing material; extruding the tubing material into a flexible tubing having an upper portion of a given cross-sectional area, a lower portion of a selected cross-sectional area larger than said given cross-sectional area of the upper portion and having a cross-sectional shape with generally flat sidewalls and a generally flat bottom wall extending between the sidewalls, and a longitudinal air passageway defined by the upper and lower portions; curing the flexible tubing; and cutting micro-slits through the upper portion of the flexible tubing, wherein said extruding, curing, and cutting are performed by an automated, one-stage production line.