Method and an apparatus for perforating polymeric film
AssigneeAmcor Limited
InventorsDavid Lee CAREW, Erol Craig Harvey, Jasson Lindsay Mills, Ramon Glenny Waycott, Richard Leigh Barber, William Howard Barling
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Abstract
A tool for perforating a polymeric film is disclosed. The tool comprises a support substrate and at least one projection (3) extending from the substrate. The projection is multi-sided with side walls that have straight sides that are tapered upwardly and inwardly from the support substrate at an angle theta (θ) that is at least 5°. The angle is measured in relation to imaginary lines extending perpendicularly to the substrate at the locations at which the side walls contact the substrate.
Claims25
A tool for perforating a polymeric film which comprises a support substrate and at least one projection extending from the substrate, with the projection being multi-sided with side walls that have straight sides that are tapered upwardly and inwardly from the support substrate at an angle theta (θ) that is at least 5°, with the angle being measured in relation to imaginary lines extending perpendicularly to the substrate at the locations at which the side walls contact the substrate.
A tool for perforating a polymeric film which comprises a support substrate and a plurality of projections for forming perforations extending from the substrate, with the projections being arranged in a pattern that comprises a series of spaced-apart parallel lines of projections.
Dependencies are inferred from the claim text.