| 摘要 |
<p>PURPOSE:To obtain a film with a rib whose surface is free from unevenness by a method wherein resin for molding of the rib is sent out to a slit having a large number of small holes for rib-lined resin and the rid-lined resin is interposed and placed between two films with a meeting slit of a die. CONSTITUTION:Resin is sent out into a first and second resin paths 7, 8 of a die 4 through a first and second extruding machines 1, 2 and a first and second films F1, F2 are molded. Then the resin extruded through a third extruding machine 3 is sent into a slit 10 having a large number of small holes through a third resin path 9 and a large number of rib lines R running parallel with each other are molded. The films F1, F2 and rib lines R are extruded through the die 4 by interposing and placing the rib lines R between the films F1, F2 with a meeting slit 11 and a film F is manufactured. Quantity of the resin for molding the rib lines R is controlled to a smaller quantity than the quantity of the resin of the films F1, F2 and a resin thickness of the rib lines R is made thinner than that of the resin of the films F1, F2.</p> |
