LAMINATED ARTICLE WITH ACOUSTICALLY ACTIVE LAYER Russian patent published in 2007 - IPC E04B1/74 G10K11/00 B32B11/02 

FIELD: building units, particularly laminated articles of vegetable material providing high acoustic properties and adapted to be used in rooms, electromechanical audio transmitters, musical instruments and the same objects.

SUBSTANCE: laminated article comprises outer layer made of wooden material, namely of wood veneer, and inner layer comprising dried plant stems and made as chips or bars of dried burdock stems. The inner layer is active acoustic layer. The article has modulus of elasticity in static flexure of 2.63×10¹⁰N/m², density of 190-215 kg/m³ and ratio between modulus of elasticity and density of (138.4 - 122.3)×10⁶ m²/s².

EFFECT: extended range of technical means for article production.

1 dwg