Sound absorbing article and method of making same

Details Sound absorbing article and method of making same Sound absorbing article and method of making same

B - Operations, Transporting

32

B

B32B 17/10 (2006.01) B32B 15/08 (2006.01)

Patent

CA 2222764

A sound dampening glazing, for example an automotive windshield, in one embodiment of the invention includes a pair of glass sheets having facilities therebetween. In cross section and moving from one glass sheet to the other, the facilities include a polyvinyl butyral sheet, an intermediate sheet having a surface harder than the surface of the interlayer to smooth the interlayer surface e.g. an intermediate polyester sheet, a sheet of dampening material, a polyester sheet, a polyvinyl butyral sheet. In another embodiment, the automotive windshield has two sheets of dampening material, the sheets have sound dampening properties in different temperature ranges to as to provide the automotive windshield with sound dampening properties over a wider temperature range. Methods for making the glazings of the instant invention are also disclosed.

La présente invention vise un vitrage insonorisant, par exemple un pare-brise d'automobile. Selon une première version, le vitrage est constitué de deux feuilles de verre entre lesquelles sont insérées une feuille de polyvinylbutyral, une feuille intermédiaire ayant une surface plus dure que la feuille de polyvinylbutyral et servant à lisser la surface de cette dernière, par exemple une feuille de polyester, une feuille de matériau insonorisant, une feuille de polyester et une feuille de polyvinylbutyral. Selon une autre version, le pare-brise est constitué de deux feuilles de matériau insonorisant, dont les propriétés insonorisantes se situent dans deux plages de températures différentes de manière à ce que l'ensemble couvre la plus grande plage possible. L'invention vise également les méthodes de fabrication de tels vitrages.

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