发明名称 |
Plastic film construction |
摘要 |
A roll of greenhouse film which is a large sheet of flattened tubular plastic film wherein the longitudinal edges of the plastic film are folded back over a surface of the film about 180 DEG toward an imaginary longitudinal line drawn substantially through the center of a surface of the film. The so-folded sheet is then longitudinally rolled.
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申请公布号 |
US4948638(A) |
申请公布日期 |
1990.08.14 |
申请号 |
US19890398059 |
申请日期 |
1989.08.24 |
申请人 |
TREDEGAR INDUSTRIES, INC. |
发明人 |
FRANCIS, MICHAEL A. |
分类号 |
A01G9/14;B65H45/09 |
主分类号 |
A01G9/14 |
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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