专利名称：Apparatus and method of manufacturing
pressure compensator type drip irrigationtubes with desired molecular orientationand tubes obtained thereby
发明人：Michael P. DeFrank,Mark D. Wynn申请号：US13342549申请日：20120103公开号：US09027856B2公开日：20150512
专利附图：
摘要：A method for manufacturing high speed pressure compensator-type drip
irrigation tubes and the tubes obtained thereby having absolute radial orientation ofmolecular chains, the orientation imparting strength as well as flexibility to the tubematerial. The said method comprises extruding a tube using a plurality of extruders;blowing up the extruded tube by introducing a pressure inside the tube relatively higherthan the pressure outside the tube; drawing the blown tube simultaneously to theblowing of tube; flattening the blown tube by heat welding the collapsed halvestogether and forming a tape immediately, subsequent to the process of blowing anddrawing the tube; extrusion of a bonding polymer on one border of the tape; printingflow channels into the hot and viscous bonding polymer; and forming a tube bylengthwise folding the tape and heat welding the overlapping borders together usingthe bonding polymer.
申请人：Michael P. DeFrank,Mark D. Wynn
地址：Madera CA US,Caruthers CA US
国籍：US,US
代理机构：Burns & Levinson LLP
代理人：Orlando Lopez
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