| http://www.w3.org/ns/prov#value | - In order to form perforations or deformations in the film as small as possible, an average maximum width dimension of less than 100 ??m is particularly suitable. [0024] The method outlined above may be utilised in a novel technique for the treatment of a thermoplastic polymeric film which involves: [0025] (a) providing a web of thermoplastic polymeric film; [0026] (b) rupturing the film to form pe
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