| 摘要 |
PURPOSE:To enable to favorably function the resultant product as a cap by a method wherein a synthetic resin sheet just extrusion-molded is thermoformed as is extrusion-molded. CONSTITUTION:Firstly, a synthetic resin sheet 1 with a thickness of 1.0-3.0mm. is formed by being extruded from and extrusion molding machine. Secondly, the molding portion 1a of the sheet 1 formed in said extrusion molding process A is partitioned by being tightly pinchingly held by a clamp 2 consisting of a cylindrical upper clamp 2a and a lower clamp 2b. Thirdly, a core 3, onto which a mold area is formed by making a spiral groove 3a or an undercut onto the peripheral surface of a cylindrical form body, is insertedly positioned in the clamp 2 in order to form a molded part or a cap S by pressingly bringing the molding portion 1a into close contact onto the mold area of the core 3, which is insertedly positioned in the clamp 2, by means of thermoforming means. Fourthly, the core 3 is released from the cap S, which is formed as is attached to the sheet 1 through the thermal forming, by being drawn out of the cap S. Fifthly, the pinching holding of the sheet 1 with the clamp 2 is released. Finally, the molded cap S is cut off and separated from the sheet in order to obtain the independent molded part. |
