| 摘要 |
PROBLEM TO BE SOLVED: To mold resin having uniform film thickness without irregular section of the resin or intentionally mold resin with necessary irregular section by easily and adequately regulating a flow rate of a cooling medium. SOLUTION: A cooling medium conducted between a plurality of nozzle plates 17 and 19 is directed by a plurality of partition wall members 22a, 22b in a central direction, injected to an outer periphery of discharged resin to cool it, and a plurality of openings are formed on the outer periphery of a cylindrical cylinder at an exhaust tube 23 for exhausting the medium between the members 22a and 22b in response to a film thickness of the discharged resin. And, an exhaust valve 30 in which a valve disc 38 formed with a plurality of recesses corresponding to the openings is rotatably inserted into the cylinder and the disc is rotated to conduct a switching operation is disposed. |
