发明名称 Method and apparatus for forming ports in drip irrigation hose
摘要 In a high speed method and apparatus for forming inlet and/or outlet ports in drip irrigation hose, the surface of one margin of a continuous length of plastic film is deformed without puncturing at periodic intervals along its length corresponding to the locations of the inlet and/or outlet ports to form protrusions from the film surface. Thereafter, the protrusions are severed from the film to form the ports. The remainder of the hose is made in a conventional fashion. Preferably, the film surface is deformed by directing the film through the nip of pair of rotating wheels. On the surface of one of the wheels is a series of blunt projections sized, shaped and positioned to correspond to the ports being formed. The protrusions are severed by the edge of a knife across which the film is directed.
申请公布号 US5123984(A) 申请公布日期 1992.06.23
申请号 US19900568941 申请日期 1990.08.17
申请人 T-SYSTEMS INTERNATIONAL, INC. 发明人 ALLPORT, DAVIES;GIUNTOLI, DAVID;HOLZER, WILLIAM F.
分类号 A01G25/02;B29C53/48 主分类号 A01G25/02
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