Method for selecting an interlayer for vibroacoustic damping, interlayer and glazing unit comprising such an interlayer
AssigneeSaint-Gobain Glass France
InventorsMarc Rehfeld, David Fournier
Life of this patent
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Abstract
The invention relates to a method for selecting a viscoelastic plastic interlayer including two outer layers and a central layer that can be incorporated between two glass sheets of a glazing unit, the method includes providing first and second components that constitute respectively the central layer and the outer layers, measuring the shear modulus G′ of the first and second components, selecting the material of the second component only if G′≧3×107 Pa at 20° C. and between 100 Hz and 240 Hz, and setting the thickness h of the first component so that h is between 0.31 mm and 1.20 mm and so that g=G′/h is between 5.58×108 Pa/m and 2.37×109 Pa/m at 20° C. and between 100 Hz and 240 Hz.
Claims11
A viscoelastic plastic interlayer configured to be incorporated between two glass sheets of a glazing unit in order to give it vibroacoustic damping properties, the interlayer comprising:
- two outer layers made of a viscoelastic plastic material, the shear modulus G′ of which is greater than or equal to 3×107 Pa at 20° C. and for a frequency range between 100 Hz and 240 Hz;
- a central layer having vibroacoustic damping properties, of thickness h, so that h is between 0.50 mm and 0.90 mm and so that the shear parameter g=G′/h of the central layer, G′ being the shear modulus, is between 7.56 ×108 Pa/m and 1.42×109 Pa/m at 20° C. and for a frequency range between 100 Hz and 240 Hz,
- wherein the central layer is between the two outer layers, and
- wherein the interlayer is an acoustic polyvinyl butyral (PVB) that includes at least the two outer layers and the central layer.
Dependencies are inferred from the claim text.