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Tank trailers are usually made from a formed aluminium sheet. Spitzer Eurovrac, a French company that specializes in the manufacture of tank trailers for powder goods, has designed a new trailer concept using a composite sandwich concept.
(Published on October 2008 – JEC Magazine #44)
LUC GALLOT, TECHNICAL SALES REPRESENTATIVE FOR FRANCE, STRUCTISO, A NIDA-CORE COMPANY
The new product is made of carbon/vinylester skins laid up around a Nidafusion STF core from Structiso, a Nida- Core Corp. company.
Specifically designed for closed moulding, Nidafusion STO and STF cores are suitable for light RTM, infusion and vacuum bag processes. Both cores are manufactured by draping fibreglass over a lightweight foam core and tufting fibreglass through the core to form triangulations with specific angles and spacings. The products are produced in France and in the USA for use in the transportation, marine and civil construction sectors, among others.
Nidafusion STO and Nidafusion STF use two different types of foam. “STO” refers to rigid foams (such as PU, PIR, and phenolics for fire resistance), whereas “STF” refers to soft foams (PE, PP) that can be moulded into shape.
The smart core makes it possible to manufacture the tanks using a tape-winding process with lay-up of Nidafusion STF sheets and carbon tapes directly around the cylindrical mandrel.
New concept improvements
The new concept shows several improvements over the traditional design: