Patent ID: 9027856
Filing Date: 2015-05-12
Classification: A01G,B29C,B29D,B29L,F16L,Y02A,Y10T

Abstract:
1. A method for manufacturing pressure compensator-type drip irrigation tubes at high speed comprising: a. extruding a polymer tube using a plurality of extruders; b. blowing up the extruded tube by inducing a pressure inside the tube; c. drawing the blown tube simultaneously to the blowing of tube, wherein an advance speed of the drawing of the tube is imposed by a speed of a sealing roller selected in a way that there is no minimal, or no stretching in a longitudinal direction and consequently no molecular orientation in an axial direction; d. flattening the blown tube by heat welding collapsed halves of the tube together using a pair of chilled rollers and forming a tape immediately subsequent to the process of blowing and drawing the tube; e. extrusion of a bonding polymer on one border of the tape; f. printing flow channels into the hot and viscous bonding polymer; and g. forming a tube by lengthwise folding the tape and heat welding the overlapping borders together using the bonding polymer; wherein simultaneous blowing and drawing of the extruded tube whereby confers radial orientation to molecular chains.