| 摘要 |
<p>Method for embodying a tennis racquet frame by moulding a tubular flexible element impregnated with resin, which comprises the following steps: - impregnating reinforcing fibers with resin; - winding said impregnated reinforcing fibers around a flexible sheath placed onto a rigid rotary-driven mandrel, caracterised in that: &cirf& the flexible tubular element has a length L1 comprised between 1200 and 1800 mm, &cirf& the impregnated reinforcing fibers windings laid over the flexible sheath have a total weight P comprised between 150 and 250 g, and are laid with angles contained between 18 DEG and 42 DEG with relation to the mandrel axis. The weights and lengths of the windings on the sheath are comprised within values indicated in the following table: Layers Length of layers Coefficients Percentage of the a, b, c/L1 total P weight of impregnated fibers L1 L1 58 % to 70 % L2 L2 = L1 x a 72% </= a </= 85% 12 % to 26 % L3 L3 = L1 x b 50% </= b </= 62% 8 % to 20 % L4 L4 = L1 x c 16% </= c </= 33% 2 % to 8 % In the preferred embodiment the finished tubular element is removed from the mandrel placed in a mould and inflated to take the form of the mould (i.e. a tennis racquet frame). <IMAGE></p> |
