| 摘要 |
<p>The invention provides a method of producing a platelike article (202) having a molding formed on a peripheral edge thereof, using an extrusion die (208) having a cavity for supplying a molding material to the peripheral edge. The peripheral edge has a straight portion (202c) and a curved corner portion (202d,202e,202f). The cavity has first and second cavity portions. The method includes the steps of: (a) inserting the peripheral edge of the platelike article (202) into the cavity of the extrusion die (208); (b) supplying the molding material to the cavity; (c) moving the platelike article (202) relative to the extrusion die (208), with a moving speed of "Vs" at the straight portion (202c) and with a moving speed of "Vc" at the curved corner portion (202d,202e,202f) while the peripheral edge is kept inserted in the cavity; and (d) extruding the molding material from the cavity onto the peripheral edge so as to form the molding on the peripheral edge, with an extrusion rate of "Ms" at the straight portion (202c) and with an extrusion rate of "Mc" at the curved corner portion (202d,202e,202f), while the steps (b) and (c) are conducted, wherein the steps of (b), (c) and (d) are respectively controlled in accordance with a radius of curvature of the curved corner portion and/or with a sectional shape of the molding such that Mc/Vc becomes different from Ms/Vs. According to the method, the molding has a substantially constant sectional shape as desired even at a curved corner portion of the platelike article (202). <IMAGE></p> |
