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US 5,116,216 AGranted
Apparatus for preparing thermoplastic composites
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsRoland C. Cochran, Edwin L. Rosenzweig
Life of this patent
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Abstract
An apparatus for processing thermo-composites is disclosed where individual lies of a prepreg, to be formed into a laminate, are processed under two, concentric vacuum chambers. Heat and consolidating pressure are applied under a first vacuum to the material and then a second vacuum is drawn under an outer, rigid shell.
Claims9
An apparatus for processing thermoplastic matrix composites, comprising:
- a. base means having a first vacuum source connected therethrough to hold unconsolidated piles of a prepreg;
- b. edge dam means surrounding said plies to prevent the pinching off of edges of the plies and to facilitate volatile removal;
- c. heat producing means to provide sufficient heat to the prepreg to melt thermoplastic resin contained therein to permit flow thereof;
- d. an air impervious bag enveloping the plies, said first vacuum source, said edge dam means and said heat producing means, and being hermetically sealed to said base means;
- and
- e. an air impervious rigid box hermetically sealed to said bag, having an interior and having a second vacuum source connected therethrough;
- wherein said air impervious bag is sealed to said base means adjacent the interior of said rigid box.
4 more elements
An apparatus for achieving void-free consolidation of individual layers of thermo-plastic composite into a solid laminate, comprising:
- a. a base surface, for holding a laminate, of predetermined dimensions and having an aperture therein for rigid connection to a first vacuum source;
- b. edge dam bars forming, on said base surface, a closed loop around the laminate;
- c. an aluminum plate of predetermined size and thickness covering the laminate for providing a surface for even distribution of a pressing force;
- d. a heating blanket of predetermined size covering said aluminum plate;
- e. a section of glass fiber material of predetermined size covering said aperture, said edge dam bars, said aluminum plate and said heating blanket, to provide a breather ply;
- f. a flexible, air-impervious diaphragm of predetermined size covering and extending beyond said glass fiber material, and sealingly connected to said base surface;
- g. a rigid, air-impervious, open-ended box having an interior and being of smaller area than the area of said diaphragm, said rigid box being sealingly connected to said flexible diaphragm, wherein said diaphragm is sealed to said base surface;
- and adjacent the interior of said rigid box;
- and
- h. a second vacuum source connected to said rigid box.
7 more elements
Dependencies are inferred from the claim text.