| 摘要 |
PURPOSE:To obtain a T-die capable to obtain favorable product when applied to the film formation by extrusion of low viscosity resin by a structure wherein a feed manifold and a pressure equalizing manifold are connected with each other through a large number of fine molten resin passages. CONSTITUTION:When pressure is applied, low viscosity resin, which fills a feed manifold 3 with an enough large volume and an enough large sectional area for a flow passage, is past through respective molten resin passages 4 with a nearly uniform flow rate so as to shift itself in a pressure equalizing manifold 5 in order to emit itself uniformly over the whole width of a die through a die slit 6. The extrusion of low viscosity resin from a wide breadth die can be possible by making the volume of the feed manifold 3 enough larger than that of the pressure equalizing manifold 5 and normally the ratio of said volumes is necessary at least 1.5:1. In addition, when the breadth of the die is larger than usual, the further the molten resin passages 4 are located from a molten resin receiving port 2, the denser they are arranged or the larger the sectional area of a passage 4 is made so that the amount of molten resin shifted to the pressure equalizing manifold is uniform in the respective passages 4. |
