| 摘要 |
A die is described comprising a die body having passage means extending therethrough and a resin inlet communicating therewith; said passage means including first and second coaxial frusto-conical passage sections tapering in the same direction, a cylindrical passage section coaxial with the frusto-conical passage sections and disposed between them connecting the smallest diameter end of the first frusto-conical passage section with the largest diameter end of the second frusto-conical passage section, and a cylindrical sizing passage section communicating with the smallest diameter end of the second frusto-conical passage section and forming the outlet of said passage means from said die body; a pilot member having a flange portion, a nose portion and a guide passage means extending therethrough having an inlet end in the flange portion and a tapered outlet end in the nose portion; said pilot member being mounted on said die body in a manner whereby said nose portion of the pilot member extends into the passage means of the die body forming an annular chamber extending at least from the resin inlet of the die body to the interior region of the second frusto-conical passage section spaced from the cylindrical sizing passage section; said nose portion including a frusto-conical section tapering toward and terminating at the outlet end of said guide passage m
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