초록 ▼

A method for making a composite panel, wherein the composite panel has a honeycomb core sandwiched between a pair of facing sheets, includes the steps of (a) coating the interior walls of the cells with a unexpanded thermo-expandable material; (b) bonding a pair of facing sheets to the opposite side

A method for making a composite panel, wherein the composite panel has a honeycomb core sandwiched between a pair of facing sheets, includes the steps of (a) coating the interior walls of the cells with a unexpanded thermo-expandable material; (b) bonding a pair of facing sheets to the opposite sides of the honeycomb core; and (c) heating the honeycomb core while the honeycomb core is sandwiched between the pair of facing sheets with sufficient heat to cause the thermo-expandable material to expand and to substantially fill the cells.

대표청구항 ▼

What is claimed is: 1. A method for making a composite panel having a honeycomb core sandwiched between a pair of facing sheets, the honeycomb core comprising a pair of opposed sides and a plurality of contiguous cells with interior walls, the method comprising the steps of: (a) coating the interio

What is claimed is: 1. A method for making a composite panel having a honeycomb core sandwiched between a pair of facing sheets, the honeycomb core comprising a pair of opposed sides and a plurality of contiguous cells with interior walls, the method comprising the steps of: (a) coating the interior walls of the cells with an unexpanded thermo-expandable material by coating interior walls of elongate cells within a honeycomb block with a unexpanded thermo-expandable material and then slicing the honeycomb block along a plane substantially perpendicular to longitudinal axes of the cells within the block to create a honeycomb core having coated interior walls; (b) bonding a pair of facing sheets to the opposite sides of the honeycomb core; and (c) heating the honeycomb core while the honeycomb core is sandwiched between the pair of facing sheets with sufficient heat to cause the thermo-expandable material to expand and to at least partially fill the cells. 2. The method of claim 1 wherein the step of bonding an exterior sheet to the opposite sides of the honeycomb core and the step of heating the honeycomb core to cause the thermo-expandable material to expand and substantially fill the cells are both accomplished in a single operation.