Method for treating films

摘要

A method for treating a film by providing a structure including a substrate and an array of upstanding projections each of which includes multiple contact points. The structure is pressed against the surface of a polymeric film to cause deformation or rupture of the film. The film may then be pressed to partially reseal the perforations. The structure can be produced by electroplating a mould which includes an array of elements of dimensions corresponding to the projections of the desired structure.