  We propose a model dielectric function for ropes of single-walled nanotubes
distributed in a glassy graphite host medium. We study the significance of the
bosonic charge excitations arising in interacting quasi-one-dimensional systems
in the screening processes. We also pay special attention to the role of the
intertube Coulomb interactions. In order to compare with experiments, weak
relaxation processes are also considered in the relaxation-time approximation.
