| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve gate for molding a crystallized preform capable of accurately preventing the occurrence of wrinkles in the top of the mouth, capable of lowering the temperature of a resin during molding to reduce the production amount of acetaldehyde and the occurring ratio of the seizing/scorching of the resin and capable of also enhancing a molding cycle. SOLUTION: A protruded part 4 for preventing the occurrence of a weld-mark caused when the resin A impinges against a stem 3 is provided to a part of the inner wall of a nozzle tip 2 equipped with the stem 3 for adjusting the supply amount of the resin. Herein, a plurality of the protruded parts 4 are preferaly provided at a pitch of 5-30 mm. Further, the clearance between each of the protruded parts 4 and the stem 3 is preferably set to 0.1-5.0 mm. COPYRIGHT: (C)2006,JPO&NCIPI |
