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Method for manufacturing a preform for a composite helmet process to obtain a composite helmet preform for a composite helmet and composite helmet
Method for manufacturing a preform for a composite helmet process to obtain a composite helmet preform for a composite helmet and composite helmet
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机译:用于制造复合头盔工艺的预成型件以获得复合头盔的复合头盔预成型件的方法和复合头盔
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摘要
A preform (36) for a protective helmet is made from resin-impregnated blanks cut from a length of reinforcing fabric (10) along a zig-zag line (13) so that each part (14, 15) has a straight edge (11, 12) and a series of teeth (18, 19) defining the opposite edge. Lengths are cut off from each part (14, 15) to form the blanks and are wrapped in a plurality of layers around a cylindrical former, sized to correspond to the head size of the helmet, so that the teeth in successive layers are in staggered relationship. The layers are then compressed in a press (34, 35) to bend the teeth (18) over into mutual engagement and form a rigid domed preform (36).
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