Honeycomb panel stacked body manufacturing method and honeycomb panel stacked body

A method for manufacturing a honeycomb panel laminate,

• the honeycomb panel laminate including a sound absorbing face, a sound absorbing layer, and a sound insulating face,
• the sound absorbing face being made of a sponge foam,
• the sound absorbing layer being composed of a honeycomb material and a layer obtained by filling spaces in cells of the honeycomb material with a hard foam material,
• the method comprising the steps of:
• (a) before filling the cell spaces in the honeycomb material, which constitutes the sound absorbing layer, with the hard foam material, bonding the honeycomb material to the sound absorbing face by applying an adhesive to hexagonal linear edges of cell walls of the honeycomb material and to rising wall surfaces of the cell walls, pushing the hexagonal linear edges of the cell walls against the sound absorbing face made of the sponge foam, and applying further pressure to press the hexagonal linear edges, to which the adhesive has been applied, of the cell walls against the sponge foam so that the hexagonal linear edges of the cell walls bite into the sponge foam;
• (b) after step (a), forming the sound absorbing layer by filling the cell spaces in the honeycomb material with the hard foam material by pressing the hard foam material into the cell spaces in the honeycomb material from a side of the honeycomb material opposite the sound absorbing face while applying pressure to such an extent that bubbles in the hard foam material do not get destructed, in order that the sound absorbing layer is in a plane state where the cell walls of the honeycomb material and the hard foam material are at substantially a same level, the hard foam material having substantially a same thickness as that of the honeycomb material,
• the sound insulating face, which is parallel to the sound absorbing face and which faces the sound absorbing face across the honeycomb material, being made of a sponge foam;
• and
• (c) bonding the honeycomb material to the sound insulating face by applying an adhesive all over a surface of the sound insulating face that is to be in contact with the honeycomb material, pushing opposite edges of the cell walls of the honeycomb material of the sound absorbing layer against the surface, to which the adhesive has been applied, of the sound insulating face made of the sponge foam, the opposite edges being opposite the hexagonal linear edges to which the adhesive was applied, the sound absorbing layer remaining in the plane state where the cell walls of the honeycomb material and the hard foam material are at substantially the same level, and applying further pressure to press the opposite edges against the surface, all over which the adhesive has been applied, of the sponge foam so that the opposite edges bite into the sponge foam.