At this point, it is necessary to set up the component to resist the internal force of the film surface, which can be a tubular metal frame, but also a thin film gas rib.
此时需要设置抵抗膜面内力的构件，该构件可以是管状的金属构架，也可是薄膜气肋，即：内充高压气体而具有一定抗弯刚度的管状。
Thin-walled tubular parts with longitudinal inner rib can satisfy the demand.
带纵向内筋的薄壁筒形件就是适应这一需要而出现的。
A pair of mold is designed for the package case with thin wall and rib by RTM process.
本文为生产特种薄壁加筋结构包装箱而设计、制备了混凝土加固玻璃钢RTM模具。
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