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US 7,029,267 B2Granted
Reusable vacuum bag and methods of its use
AssigneeSaint-Gobain Technical Fabrics Canada, Ltd.
InventorMark C. Caron
Life of this patent
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Abstract
Reusable vacuum bags are provided which include a fabric layer containing reinforcement fibers and a release surface disposed on at least the first side of the fabric layer. The vacuum bag is capable of withstanding multiple mold cycles of the vacuum of less than ambient pressure without significant leakage. In addition, the described vacuum bag can be used in resin transfer molding and standard bagging operations with commercial benefit.
Claims26
A vacuum bag for forming a vacuum envelope over one or more polymeric materials being formed against a mold, comprising:
- a) a fabric reinforced with flexible reinforcement fibers to withstand multiple mold cycles, the fabric having a flexible portion and a semi-rigid section;
- and
- b) a chemically non-reactive and non-adhering material forming a release surface to separate said fabric from the polymeric material being formed against the mold.
A vacuum bag comprising:
- a fabric layer reinforced with high strength reinforcing fibers to withstand multiple mold cycles of a vacuum of less than ambient pressure without significant leakage;
- each side of said fabric layer having a corresponding non-stick fluorocarbon-based release layer bonded thereto;
- and
- said vacuum bag forming a shaped cavity for shaping polymeric materials against a mold.
1 more element
Dependencies are inferred from the claim text.