solid rib


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centering

centering: two types
A temporary structure upon which the materials of a vault or arch are supported in position until the work becomes self-supporting.
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Triple-wall PE pipe has existed for decades, but was previously made using spiral-wound solid ribs between separately extruded skins.
Traditional solid ribs are limited to 60% of nominal wall thickness if you want to avoid sinks.
Parts can be hollow overall with randomly dispersed solid ribs, or they can be designed with localized hollow channels as in conventional gas-assist techniques, says Ed Hunerberg, Johnson Controls' director of engineering.