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Manufacturing
Processes - Vacuum
Bag Molding
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Composite
Molding
Processes
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Composite
Molding Processes
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Vacuum Bag Molding
Vacuum bag molding,
a refinement of hand lay-up, uses
a vacuum to eliminate entrapped air
and excess resin. After the lay-up
is fabricated on either a male or
female mold from precut plies of glass
mat or fabric and resin, a nonadhering
film of polyvinyl alcohol or nylon
is placed over the lay-up and sealed
at the mold flange. A vacuum is drawn
on the bag formed by the film while
the composite is cured at room or
elevated temperatures. Compared to
hand lay-up, the vacuum method provides
higher reinforcement concentrations,
better adhesion between layers, and
more control over resin/glass ratios.
Advanced composite parts utilize this
method with preimpregnated fabrics
rather than wet lay-up materials and
require oven or autoclave cures.
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