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.
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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 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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