Fig. 1
From: Self-folding of thick paper via continuous solution supply analyzed by FTIR spectroscopy
Process of self-folding paper using inkjet printing. (a) Solution is ejected from the printer onto the paper surface. (b) The permeated region expands as the solution penetrates, generating an initial mountain fold. (c) Transient state in which expansion and contraction momentarily balance and the sheet becomes flattened. (d) Contraction becomes dominant as retained solution decreases, and plastic deformation in this concave configuration fixes the folded geometry.
