A continuous, multi-phase process for debossing and perforating a substantially continuous web of substantially planar polymeric film to coincide with the image of one or more forming structures, each having a patterned forming surface with a multiplicity of holes and an opposed surface. Each forming...http://www.google.de/patents/US4609518?utm_source=gb-gplus-sharePatent US4609518 - Multi-phase process for debossing and perforating a polymeric web to coincide with the image of one or more three-dimensional forming structures
