| 摘要 |
<p>Temporary screen for agricultural seedlings etc. comprises a square of flexible woven fabric cut so that the weft and warp cords are aligned with the diagonals by which the screen is supported from opposite corners, so that one pair of corners is higher than the other pair. The screen is supported by tubular poles braced with wires. The height and angle of the screen is adjustable, opt. by remotely controlled cord and pulley systems. Claims translucent screens of fabric made from 'high tenacity polyester' filaments, and made impermeable by a coating of coloured PVC plastisol stabilised against weather, heat and UV light, in e.g. semi-desert climates.</p> |
