Claims
- 1. The method of making a lock core panel of layers of strands forming a face sheet, a base sheet spaced from said face sheet and impervious to sound waves, and a core sheet, said sheets being fibrous, said fibrous sheets preimpregnated with a resin, comprising the steps of alternately stitching the core sheet to the face and to the base sheet, forming the resulting composite to its resultant shape and curing to create a rigid structural panel.
- 2. The method of making a lock core panel as in claim 1 wherein said face sheet is formed by angularly orienting said layers of strands and fastening them together for improved strength characteristics.
- 3. The method of making a lock core panel as in claim 1 wherein preselected fibers are removed from the face sheet before curing to provide openings in said face sheet through which acoustic energy may pass.
- 4. The method of making a lock core panel as in claim 3 wherein said preselected fibers are of solvent removable rayon acetate which are removed with a solvent before curing of the face sheet.
- 5. The method of making a lock core panel as in claim 3 wherein said preselected fibers are of water soluble poly vinyl alcohol which are removed with water prior to curing of the face sheet.
Parent Case Info
This is a division of application Ser. No. 479,842, filed June 17, 1974, now U.S. Pat. No. 3,960,236.
US Referenced Citations (7)
Divisions (1)
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Number |
Date |
Country |
Parent |
479842 |
Jun 1974 |
|