Recent Developments and Open Problems in Composites Materials Manufacturing
Resin injection molding is the most widely used technique to produce composites. It consists in injecting a polymeric melt in a porous material, usually called solid preform. The solid preform is placed in a mould and the liquid constituent is injected through it. As the liquid front advances and impregnates the preform, it displaces the air that outflows from the mould through suitably located air vents. When the liquid constituent has solidified or is completely polymerized, the mould is opened and the composite materials is available for subsequent finishing operations. The structure of the preform can strongly differ from case to case: it can exhibit a sponge—like structures, or a knitted one, it can be made of fibers, bundles, or mats, and so on. In all these cases the infiltration process can be schematized as the flow of a liquid through a deformable porous material.
KeywordsPorous Medium Injection Moulding Infiltration Process Resin Cure Surface Area Fraction
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