Abstract: A device for soundproofing a plate, includes a soundproofing part and a mounting part, wherein the mounting part is to be mounted secured to a border of the plate, the mounting part being mounted secured to the soundproofing part and having a second thickness h2 in contact with the soundproofing part, and the soundproofing part is made of a first material, and extends along a first length l in a first main direction, the soundproofing part having a first thickness h1 of the first material in a direction perpendicular to the first main direction the first thickness h1 varying, based on an x coordinate, along the first length l, proportionally to a value of xn, wherein n is a real number strictly greater than 1, from a minimal thickness h1min until h2, the first length l being so that h1min, is less than or equal to one third of h2.

Abstract: A device for soundproofing a plate, includes a soundproofing part and a mounting part, wherein the mounting part is to be mounted secured to a border of the plate, the mounting part being mounted secured to the soundproofing part and having a second thickness h2 in contact with the soundproofing part, and the soundproofing part is made of a first material, and extends along a first length l in a first main direction, the soundproofing part having a first thickness h1 of the first material in a direction perpendicular to the first main direction the first thickness h1 varying, based on an x coordinate, along the first length l, proportionally to a value of xn, wherein n is a real number strictly greater than 1, from a minimal thickness h1min until h2, the first length l being so that h1min, is less than or equal to one third of h2.

Abstract: A viscoelastic plastic interlayer to be incorporated between two glass sheets of a glazing provides it with vibro-acoustic damping properties. The interlayer includes two outer layers made of standard PVB, first and second inner layers made of viscoelastic plastic material based on polyvinyl acetal and plasticizer, with improved acoustic properties, a central layer made of standard PVB, the first and the second inner layers being arranged, respectively, between the central layer and the first and second outer layers. The viscoelastic plastic interlayer, when incorporated between two glass sheets to form a laminated glazing with vibro-acoustic damping properties, allows an improvement in the acoustic insulation properties, in particular within a frequency range of between 1000 Hz and 5000 Hz, in which range the human ear is the most sensitive.