| abstract |
The film comprises a first surface and an opposing second surface with a plurality of projections defined in the surfaces. Projections may extend from a single, or both surfaces (figure 2). The projections may be located in a rectangular envelope 3 with each projection 2 abutting the edge of the envelope. The centers of the envelopes may be 3 to 6 millimeters apart in the x dimension and 2-4 mm apart in the y dimension, as shown. The film may be between 50 and 100 micrometers thick. In use, the film makes minimal noise when one part of the film is moved in relation to another part of the film. |