| 摘要 |
A ski which has a sandwich structure including upper and lower plastic laminations and a foamed plastic core situated therebetween with dense side portions integral with the upper and lower laminations and forming a shell surrounding the foamed core has in its new finished condition the same condition as when the ski is removed from a mold, so that finishing operations are not required subsequent to removal of the ski from the mold. The mold which is used to manufacture the ski has opposed relatively wide walls and a pair of opposed relatively narrow walls which are permanently fixed to one of the relatively wide walls while the other of the relatively wide walls is movable to and from an operating position closing the mold and cooperating with the relatively narrow walls for this purpose. The relatively wide walls have inner surfaces directed toward the interior of the mold to define part of the mold cavity, and against these inner surfaces the upper and lower laminations of the ski are held by a suitable holding structure so that the foamable plastic can be injected into the mold between the upper and lower laminations to become bonded integrally therewith while forming the dense side portions along the inner surfaces of the relatively narrow mold walls. According to the method, the mold downwardly extends in its longitudinal forward direction at an angle to the horizontal so that gravity forces can be employed in order to promote a complete filling of the core space within the mold with foamable plastic material. The upper lamination of the ski, which preferably is narrower than the lower lamination thereof, is first placed in the mold, after being completely finished, while being held in place by an adhesive tape which in addition to holding this upper lamination in the mold serves to protect the finish thereof, the lower ski lamination being situated against the inner surface of the movable mold wall and held thereagainst during the injection of the foamable plastic. According to the method, when the foamable plastic has cured to form the core, the ski structure is removed from the mold, and no further surface-finishing operations are required. |
