| 摘要 |
<p>PURPOSE:To make it possible to breadthwise splice agricultural films, the front surface of which consists of non-rigid polyvinyl chloride resin and the rear surface of which consists of non-rigid polyvinyl chloride resin and high- frequency-unweldable resin, by a method wherein base layers of abutting portions and a band-shaped film, the width of which is a little broader than the width of one roller electrode are welded in a bridge-like form by one action between a pair of roller electrodes each having predetermined width. CONSTITUTION:In a high frequency welder, the width of one roller electrode must be 18mm at least and narrower than the width of a non-rigid polyvinyl chloride band-shaped film, while the width of the other roller electrode must be broader than that of said roller electrode. Composite films, to each of which other high-frequency-unweldable resin is laminated, are abutted against each other and then, after a non-rigid polyvinyl chloride resin band-shaped film the width of which is cut so as to be broader than the width of the electrode by 7-5mm, is put over the abutted surfaces, the films are pinched between a pair of the roller electrodes so as to weld base layers and the band-shaped film in a bridge-like form by one action in order to breadthwise splice the films.</p> |
