CONTINUOUS PROCESS OF HOSE MANUFACTURE AND DRIP IRRIGATION HOSE Russian patent published in 1999 - IPC

FIELD: irrigation equipment. SUBSTANCE: first strip of plastic film having first and second longitudinal edges is delivered to assembly stage continuously. First strip of film has longitudinal central part between edges on which one or more uniform melted balls of compatible plastic are deposited. Balls are used to form channel with melted side walls on control part for flow control. The second strip of plastic film narrower than the first one is fed. It is welded to melted walls, thus forming channel designed to control flow between side walls and first and second strips of film. Outlet holes from hose to control channel are made through spaces along hose length. Hose inlet holes from flow control channel are also made through certain spaces along hose length. Edges of first strip are folded longitudinally with overlapping and welded. Drip irrigation hose has extended water-supply channel of larger cross-sectional area, extended flow- control channel of smaller cross-sectional area, multiple channel inlet holes for control of flow from delivery channel, multiple channel outlet holes for control of flow outgoing from hose, and turbulent flow section formed along channel length for flow control. Hose is provided with laminar flow section formed along channel length and adjacent to turbulent flow section. Hose has facilities responding to pressure in water supply channel so as to reduce cross-sectional area of laminar flow section at pressure rise for compensation of pressure variation effect on flow rate of drops from hose. Hose makes is possible to obtain constant flow rate of drops from every outlet hole. Use of turbulent and laminar flow sections makes flow rate of water running from hose less dependent from pressure. EFFECT: enhanced efficiency. 15 cl, 7 dwg