| 摘要 |
<p>Method for molding multiple injection of plastic materials for manufacturing integral elastic supports, such as bicycle saddles or similar cushion or seat articles, formed of elastically yieldable padding (6) firmly secured to a support framework (2), said method comprising the following steps: A) providing a variable geometry mold (7) having a first configuration (7a) with an internal cavity adapted to form the support frame and a second configuration (7b) with an internal cavity adapted to form the entire support, B) injecting a first plastic material in the mold cavity in its first configuration (7a) to form the framework (2), C) modifying the mold from the first (7a) to the second configuration (7b), D) injecting a second plastic material in the mold internal cavity in its second configuration, form the padding, E) opening the mold and removing the finished saddle. During step B) a metered quantity of gas or air is blown in the injected mass, to provide at least one enlightening blow passage (15). The integral elastic support obtained is substantially free of flaws and uneveness in the contact area of the two component materials, and exhibits impressed mechanical strength and lightness, excellent finished suface and high aesthetic value.</p> |
