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The method used for the production of the springs is a variation of the RTM (Resin Transfer Moulding) process. Through this method, the dry braids are positioned in the mould before being impregnated with the resin, making production very clean and simple. In this case, an open mould consisting of a helically grooved mandrel was used, and the braids are impregnated by plunging in a bowl filled with resin. The production process can be described in few steps:
- A silicon tube is filled with sand in order to let the braids keep a circular shape when winded. The number of socks needed to achieve the required thickness is then superimposed on the silicone tube.
- The braids are then wound around the mould.
- The mould is put in the oven to warm up together with the resin, in order to facilitate the impregnation.
- The resin is cured while turning on its axis. This allows the resin in excess to be equally removed from the spring. The curing time is 12 hours (3 hours 80°C + 8 hours 160°C). The figure shows the spring after being cured.
- After the curing time the mould is then easily removable from the mould. The figure shows the product when extracted from the mould.
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