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O. Paprzycki, E. Urbanik

Internal stresses in systems composed of layers of impregnating resin and lacquer coating used in the manufacture of artificial veneer

Polimery 1989, No 1, 20

DOI: dx.doi.org/10.14314/polimery.1989.020


The polycondensation and thermal stresses in layers of plastified impregnating urea-formaldehyde resins, in coating from chemosetting water-dilutable lacquers, and in two-layer systems composed of lacquer coating and impregnating resin have been determined. Curing of resins and coatings has been carried out at temperatures in the range of 60—140°C. It has been found that in the resin layer there are appeared tensile stresses of 4—5 MPa, in the lacquer coating of 4—16 MPa and in the two-layer systems of 2—5 MPa. Conditioning at ambient conditions changes the tensile stresses into compressive stresses in the resin layer and a relaxation of stresses in lacquer coatings to the value of 2—13 MPa and in the two-layer systems to 0.3—0.6 MPa. This relaxation is due to the absorption of humidity from environment by resins and lacquer coatings.

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