Drying Stresses in Hardboard and the Introduction of Cross-Linking Stresses By a Heat Treatment

In a cross-linking process, such as a heat treatment, covalent bonds are formed in the cellulosic material at almost water free conditions, where the dimensions of the cellulosic material are at a minimum. Due to the bonds, new stresses, here called cross-linking stresses, are introduced, which oppose the drying process. If drying stresses are present, the cross-linking stresses work to balance them. Thus, the cross-linking reduces the permanent contraction the plane of the sheet of wet-processed hardboard.

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