| 摘要 |
<p>A structural element (10) comprises a composite sheet (11) that is folded to form parallel ribs (22), that each comprises two folds (28) along which the support sheet (11) is folded in the same direction, with an apex (26) extending between the two folds (28). Each of the ribs (22) is formed by compressing the composite sheet (11) from opposing sides to form two pairs of grooves on opposing sides of the sheet (11), and folding the sheet (11) along the grooves of both pairs to form the pair of folds (28) of the rib (22).</p> |
