Patent ID: 9733173
Date: 2017-08-15
CPC Classifications: B32B,B60J,B60R,E06B,G01N,Y10T

Claim:
1. A method for selecting a viscoelastic plastic interlayer including two outer layers and a central layer configured to be incorporated between two sheets of glass of a glazing unit, the method comprising: providing a first component made of a viscoelastic plastic material intended to constitute the central layer and a second component made of a viscoelastic plastic material intended to constitute the two outer layers, the central layer being located between the two outer layers, measuring the shear modulus G′ of the first component and of the second component by a viscoanalyzer; selecting the material of the second component only if its shear modulus G′ is greater than or equal to 3×10 setting the thickness h of the first component so that h is between 0.50 mm and 0.90 mm and so that the shear parameter g=G′/h, G′ being the shear modulus, is between 7.56×10 wherein the interlayer is an acoustic polyvinyl butyral (PVB) that includes at least the two outer layers and the central layer.