Patent ID: 7186310

Claim:
A method for forming a honeycomb sandwich composite panel comprising: stacking dry fabric, an unpermeating-resin film in contiguity with the dry fabric, a honeycomb core, and a non-low viscosity resin film in contiguity with the honeycomb core and positioned between the honeycomb core and unpermeating-resin film in the honeycomb sandwich composite panel to form a stacked structure on a lower half mold of a mold; putting an upper half mold of the mold on the stacked structure and clamping together the upper half mold and the lower half mold; heating an interior of the mold at a first temperature for a predetermined heating time to cure the unpermeating-resin film and the non-low-viscosity-resin film and to dry the dry fabric; changing a temperature of the interior of the mold to a second temperature while the interior of the mold is evacuated; and then supplying an impregnating resin into the mold to impregnate the dry fabric with the impregnating resin; and heating the interior of the mold at a third temperature for a predetermined heating time to cure the impregnating resin supplied into the mold, wherein the unpermeating-resin film contiguous with the dry fabric has a flowing profile different from a profile of the non-low-viscosity-resin film contiguous with the honeycomb core, and the flowing profile of the unpermeating-resin film is a property for preventing the resin forming the unpermeating-resin film from permeating into the dry fabric at the first temperature to cure the unpermeating-resin film and the non-low-viscosity-resin film and to dry the dry fabric.