Joseph Michael Donckers from Blacksburg, VA, age 57

Process For Manufacture Of Perforated Slab Propellant
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US Patent:

60714441, Jun 6, 2000
Filed:

Nov 24, 1997
Appl. No.:

8/979447
Inventors:

William J. Worrell - Draper VA
David A. Worrell - Radford VA
Joseph M. Donckers - Blacksburg VA
Assignee:

Alliant Techsystems Inc. - Hopkins MN
International Classification:

B29C 6700
US Classification:

264 31
Abstract:

A method of producing a perforation pattern in a slab of thermoplastic propellant material and the material produced includes subjecting the slab to a perforating press operation in which the press has a patterned array of fixed perforating members arranged according to a first pattern coordinated with a system for advancing and incrementally indexing the slab through the press is used to perforate the slab to create a desired second, denser perforation pattern by subjecting the slab to a series of perforation actions by the patterned array of perforating means coordinated with the indexing of the slab through the press.