| 摘要 |
PURPOSE:To form a core layer sufficiently even in the circumference of a rear attaching hole by the use of a mold provided with a small tab passage eccentrically on the side of a dewatering core with respect to the perpendicular, and injecting a skin layer material into the cavity, and then a core layer material is injected into the skin layer material, whereby the cavity is filled with both materials. CONSTITUTION:A small passage 36 is allowed to intersect with the tip surface 308 of a molding and provided on the place P at an angle of (alpha) with respect to the perpendicular M passing through the center O of a rear core 33. The angle (alpha) is made 10-90 degree. Upon molding of the sandwich of a mud guard, a skin layer material 60 is injected from a gate 32 to the cavity 30, and then the skin layer material is injected with a core layer material 70 thereinto. The core layer material 70 reaches the circumference of the rear core 33 via the circumference of a dewatering core while injecting the inner part of the cavity 3, and the core layer material 70 is permitted to flow a little into a tab from the small passage 36 while extruding the excess skin layer material 60 to the tab 37. |
