| 摘要 |
PURPOSE:To mold at a high speed and stably by providing an air port oriented horizontally with respect to the central line of a device and an air port oriented within a specific angle range as an airing air port for the use of inflation molding. CONSTITUTION:An upper lip 10, a middle lip 11, and a lower lip 12, are attached to an airing main body 13. A cooling air 4 coming in from a cooling air inlet 1 becomes nearly uniform speed in the annular direction at a partition plate 2 and is distributed to blowoff ports 7 and 8 at the middle lip 11. For the angle of the port 8, an angle alpha of 0 deg. through 90 deg. both inclusive with respect to the central line A is necessary. On the other hand, the port 7 is oriented to the rectangular direction with respect to the central line A, that is, an angle gammais made to be within 0+ or -10 deg.. A melted resin receives the cooling air 4 nearly from the vertical direction and is cooled rapidly, so that stability of a valve will be improved. Also, as the cooling air 4 is blown off from the 2 parts, the heated air touches the valve surface a little, so that larger cooling effect can be obtained. |
