TABLE OF CONTENTS Like any other kind of commercial goods, inhibited polymer films should comply with certain quality parameters and requirements indicated in standards and technical specifications.
Such characteristics as the external view of the films, their linear dimensions, deformation and strength parameters, and CI concentration are subjected to obligatory checking. The protective properties of the films are evaluated as necessary.
The appearance of the films is examined in order to exclude various defects in the form of ruptures, punctures, bends, fracture, foreign inclusions, surface soiling, etc. A defect peculiar to inhibited films produced by joint processing of VCI and polymer melts is gas inclusion arising from foaming of the polymer binder by CI vapors. This may occur when temperature regimes for molding are not strictly observed and may lead to violation of film continuity. Films containing powder CI sometimes acquire defects as a result of agglomeration of inhibitor particles. Uneven distribution of liquid-phase CI in the polymer binder results in areas of excess exudation of inhibiting liquid. Multilayered and combined film materials should be devoid of any delamination resulting from disruption of the adhesive bonding of the constituent layers.
The linear dimensions of the films refers to their width and thickness. The thickness of the films is an important parameter as it reflects stability of molding regimes and defines their strength. The measurement procedure for linear dimensions of films is specified in both national and international standards [139], [140], [141], [142]. Relative changes...
