Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including use of vacuum
Reexamination Certificate
2007-03-06
2007-03-06
Johnson, Christina (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Including use of vacuum
C264S511000, C264S553000
Reexamination Certificate
active
11110996
ABSTRACT:
A double vacuum bag molding assembly with improved void management and laminate net shape control which provides a double vacuum environment for use in fabricating composites from prepregs containing air and/or volatiles such as reactive resin matrix composites or composites from solvent containing prepregs with non-reactive resins matrices. By using two vacuum environments during the curing process, a vacuum can be drawn during a B-stage of a two-step cycle without placing the composite under significant relative pressure. During the final cure stage, a significant pressure can be applied by releasing the vacuum in one of the two environments. Inner and outer bags are useful for creating the two vacuum environments with a perforated tool intermediate the two. The composite is placed intermediate a tool plate and a caul plate in the first environment with the inner bag and tool plate defining the first environment. The second environment is characterized by the outer bag which is placed over the inner bag and the tool plate.
REFERENCES:
patent: 4942013 (1990-07-01), Palmer et al.
patent: 5236646 (1993-08-01), Cochran et al.
Hou Tan-Hung
Jensen Brian J.
Gibbens Barry V.
Huson Monica A
Johnson Christina
The United States of America as represented by the Administrator
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