Plastic and nonmetallic article shaping or treating: processes – Explosive or propellant article shaping or treating – Extrusion to form sheet or rod
Patent
1992-09-14
1993-05-11
Nelson, Peter A.
Plastic and nonmetallic article shaping or treating: processes
Explosive or propellant article shaping or treating
Extrusion to form sheet or rod
264 34, 86 2012, 102289, 102290, C06B 2100
Patent
active
052098761
ABSTRACT:
A method of providing a very strong mechanical interlock between the insuor and propellant of an interceptor rocket motor by employing a first lay-up material comprised of a cloth mat of woven cotton cloth (muslin) over a release liner with bleeder which covers a mandrel shell with a boss and a second lay-up material of an uncured vulcanizable rubber insulator, e.g., ethylene-propylene-diene-monomer (EPDM) with additives and curatives. The lay-up materials are subjected to a vacuum bag and autoclave curing environment to complete a vulcanization cycle to vulcanize and consolidate the insulator to the cloth mat. The vulcanized insulator/cloth mat is installed in a rocket motor case. The muslin cloth mat has many protruding microfibers which will be in the interface section when an uncured propellant composition is cast onto and cured to the vulcanized insulator/cloth mat. A very strong mechanical interlock is achieved which exceeds breaking strength of propellant and insulator. Tensile adhesion strength, shear composite adhesion strength, and peel strength are higher for cloth mat faced or fabric faced insulator on propellant-to-insulator bonding as compared with insulator-propellant bonding without cloth mat facing.
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Bush Freddie M.
Nelson Peter A.
Nicholson Hugh P.
The United States of America as represented by the Secretary of
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