  We show that we can release the rigidity of the skew Howe duality process for
${\mathfrak sl}_n$ knot invariants by rescaling the quantum Weyl group action,
and recover skein modules for web-tangles. This skew Howe duality phenomenon
can be extended to the affine ${\mathfrak sl}_m$ case, corresponding to looking
at tangles embedded in a solid torus. We investigate the relations between the
invariants constructed by evaluation representations (and affinization of them)
and usual skein modules, and give tools for interpretations of annular skein
modules as sub-algebras of intertwiners for particular $U_q({\mathfrak sl}_n)$
representations. The categorification proposed in a joint work with A. Lauda
and D. Rose also admits a direct extension in the affine case.
