| 摘要 |
The invention refers to a plastic film for coverage with loose openings for weight insertion at its edges that is used in linear cultivations whose edges ( 3 ) have been elongated up to 100% and have been folded and welded onto the main part of the plastic film with consecutive umbrella weldings ( 7 ). Due to the elongation of its edges ( 3 ) and the shape of the umbrella weldings ( 7 ), consecutive hoppers ( 8 ) are formed along the edge of the film. During the use of the film and due to the inclination that the film has towards its edges the hoppers ( 8 )) that form the loose openings for the fluid material in the weight insertion vaults ( 9 ) can readily accumulate any fluid material ( 11,12 ) and guide it by means of gravity to the weight vaults ( 9 ) where it is entrapped. Hence the weight insertion process becomes a rather simple matter without excessive cost and strenuous work. |
