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Rocche di Carbonio sulle rastrelliere

Production process
Carbon or glass fibers are conveyed through a rack from the bobbins to the resin tank for the impregnating process.

Impregnazione nella resina delle fibre di Carbonio

The impregnate fibers are conveyed through a warmed mould for the polymerization process under pressure; by this operation the empty spaces between the fibers are removed.

Stampo riscaldato

Usually the mould is warmed with resistors controlled by thermocouples. The warming time depends of the production speed.

Sistema di traino

During the moulding and the polymerization process the profile is moved out by the pulling system at fixed speed and it’s cut at the needed length by a disk saw.  

Sistema di taglio

During the production process the profile can be reinforced outside and inside along various axial directions by fitting in some strips of mat or carbon fabric, or by winding it with carbon filaments

Composite Materials

Composite materials are made with fibers as glass, carbon,boron and aramidic fiber, included in a resin matrix (polyester, vinil, epoxy, phenolic) which does not have tasks of meccanical resistance, but guarantees the cohesion between the adjacent layers. Their discovery is due to the large engagement, as well economic as human, of the aerospace industry in tecnological search.

Really in the a.m field this industry spent many efforts to obtain the better compromise between resistance, weight and cost for the structure of the aircraft and to realize the best performance in terms of energetic saving.

As regards this matter, the metallic materials have not totally satisfied the conditions previously exposed, due specially to the high costs and the difficult in assembling the strutture; therefore the researchers, at the beginning of the years sixty, tried new solutions.

 Filato di Carbonio

The greater attentions have been turned towards those elements that introduced bottom values of molecular weight as the lithium, beryllium, boron and carbon. It discards the lithium and the beryllium which are more espansive and not easy to find, the searches have concentrated on boron and carbon.

With fibers made up of carbon, they have been resolved also some economical disadvantages thanks to a better technology of production and the greatest availability of this element in nature. As departure products have been chosen poliacrilonitrile and the rayon, two polymers which have a strong percentage of carbon (beyond 65%) and adapted characteristics for being able to face the tranformation process.

In order to reach the production of fibers, in fact, the polymers must endure before the pyrolysis (variation of the chemical compositions for effect of the heat) to aproximately 200 °C in oxygen presence and the elimination of the elements different than the carbon.

The highest meccanical characteristics are due to a traction exercised on the fibers during the a.m. two process and can partially be modified by changing the temperatures. In the year 1971 an other product, the aramidic fiber, joined the carbon as material having advanced meccanical an peculiar characteristics, leaving not from syntetuc polymers but from an organic compound, the aromatic poliamyde, for which the production process still protected from world-wide licence.

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