Drumhead material and method
AssigneeDimension Polyant Sailcloth, Inc.
InventorDavid McGill
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Abstract
A drum head material is prepared by assembling a multi-layer laminate comprising upper and lower sheets of resilient, polymeric film and at least two oriented fiber layers positioned between said sheets. Each of the oriented fiber layers comprises parallel resilient fibers having high modulus of elasticity and a defined direction of orientation. The layers are positioned such that the directions of orientation of the two layers intersect. The layers are pressed to adhere them and form a drumhead membrane. In the preferred form, the films are of polyethylene terephthalate and the fibers are of polyaramid. If two fiber layers are employed, the fibers in the layers preferably intersect at right angles. If three layers of fibers are employed, the fibers preferably intersect at an angle of 60 degrees.
Claims20
A method of preparing a drumhead membrane, comprising:
- laminate comprising upper and lower sheets of resilient, polymeric film and at least two oriented fiber layers positioned between said sheets, wherein each of the oriented fiber layers comprises parallel resilient fibers having high modulus of elasticity and a defined direction of orientation, and the layers are positioned such that the directions of orientation of the two layers intersect;
- and
- pressing said laminate to adhere all layers and thereby form a drumhead membrane.
A drumhead membrane having good tonal qualities, good abrasion resistance and high resistance to delamination, formed of a multi-layer laminate, comprising:
- upper and lower sheets of resilient polymeric film characterized by high initial modulus and having a thickness of 25 to 250 μm.;
- and
- at least two oriented fiber layers positioned between said sheets, said oriented fiber layers comprised of a resilient polymer and characterized by high initial modulus and having a weight of from 100 to 3000 denier;
- wherein each of said oriented fiber layers comprises fibers oriented in a single direction and the layers are positions such that the directions of orientation of the fibers intersect.
Dependencies are inferred from the claim text.