Cardboard with edge sealed with mixture of hot-melt adhesive and wax

Cardboard with edges sealed with a mixture of a hot-melt adhesive and wax, wherein the cardboard comprises a first surface sheet, a second surface sheet, and an intermediate core material provided between the surface sheets;

• the intermediate core material has a top side and a bottom side each forming at least one interstitial space with a corresponding one of the surface sheets;
• the surface sheets have a pair of corresponding edges that form an edge opening therebetween;
• and the edge opening is in communication with the interstitial spaces;
• the cardboard being characterized in that the interstitial spaces are provided therein with an edge-sealing structure for sealing the edge opening, the edge-sealing structure comprising:
• a primer layer, formed by an adhesive mixture, and the adhesive mixture made by mixing the hot-melt adhesive with the wax, wherein the hot-melt adhesive makes up 10% to 65% by weight of the adhesive mixture, the adhesive mixture is applied to the edge opening to adhesively bond the surface sheets and the intermediate core material together, and the adhesive mixture when cured forms the primer layer with a plurality of voids;
• and
• a sealing layer, formed by a sealing mixture, and the sealing mixture made by mixing the hot-melt adhesive with the wax, wherein the hot-melt adhesive makes up 5% to 40% by weight of the sealing mixture, the hot-melt adhesive in the sealing mixture has a lower weight percentage than the hot-melt adhesive in the adhesive mixture such that the sealing mixture is less adhesive than the adhesive mixture, and the sealing mixture is applied to the primer layer to fill up said voids in the primer layer that correspond to the edge opening, thereby forming the sealing layer.