Regarding the dimensions of ribs, there are three key elements: length, width, and height. The height here refers to the protrusion of the rib from the wall surface, and it is primarily this height that determines the rib's strength. Generally, the designed height of a rib should be at least four times the average wall thickness of the product to significantly enhance its strength. The width of the rib should be designed to be at least five times the average wall thickness to provide sufficient space for powder or liquid to flow adequately into the cavity. If the space is too narrow, the raw material cannot flow evenly into this part of the mold cavity, leading to bridging, internal voids, and increased shrinkage in the product.
When hollow ribs cannot be used, shorter solid ribs may be employed. However, solid ribs present issues such as a tendency for the material to bridge and an inability to completely fill the mold cavity where the rib is located. If a solid rib is fully filled, it results in localized wall thickening, increasing cooling time and causing greater shrinkage than the thinner walls surrounding the rib, which can deform the adjacent wall surfaces. Therefore, solid ribs are generally used with caution.
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