| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a valve gate type mold apparatus which controls forming of a pressing mark caused by a tip of a valve pin remaining on a design surface of a molding to enable the design surface to give few optically adverse influence, when forming a cover lens constituting a lamp for a vehicle by injection molding using the valve gate type mold apparatus. <P>SOLUTION: A design surface forming area 56 of a cavity 55 of a mold for molding a part of the design surface of the cover lens is formed in the inclined state by a determined angle with respect to the vertical surface direction of the mold opening direction of the mold. While a valve gate 60 is arranged on the design surface forming area 56, the insert-pull direction of a valve pin 65, which is inserted into and pulled from a cylinder interior 65 of a gate part 61 of the valve gate 60 to close and open a passage of a melt resin, is set to the same direction of the mold opening direction. The shape of the tip part 69 of the valve pin 65 is convex spherical or convex conical, and also a tip surface 70 is a concave and convex surface, which is structured of a plurality of concave parts and convex parts. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
