US 11,725,315 B2
Method for producing a fibrous mat for the acoustic and/or thermal insulation of a component of a motor vehicle
Luigi Zara, Refrontolo (IT)
Assigned to SO.LA.IS.—SOCIETA' LAVORAZIONE ISOLANTI—S.R.L. CON UNICO SOCIO, Refrontolo (IT)
Appl. No. 16/84,667
Filed by SO.LA.IS.—SOCIETA' LAVORAZIONE ISOLANTI—S.R.L. CON UNICO SOCIO, Refrontolo (IT)
PCT Filed Mar. 16, 2017, PCT No. PCT/IB2017/051545
§ 371(c)(1), (2) Date Sep. 13, 2018,
PCT Pub. No. WO2017/158556, PCT Pub. Date Sep. 21, 2017.
Claims priority of application No. 102016000027681 (IT), filed on Mar. 16, 2016.
Prior Publication US 2019/0078244 A1, Mar. 14, 2019
Int. Cl. D04H 1/76 (2012.01); D04H 3/002 (2012.01); F01N 1/24 (2006.01); D04H 3/018 (2012.01); F01N 3/28 (2006.01); D04H 3/077 (2012.01); D04H 3/07 (2012.01); D04H 3/005 (2012.01); D04H 3/00 (2012.01)
CPC D04H 1/76 (2013.01) [D04H 3/00 (2013.01); D04H 3/002 (2013.01); D04H 3/005 (2013.01); D04H 3/018 (2013.01); D04H 3/07 (2013.01); D04H 3/077 (2013.01); F01N 1/24 (2013.01); F01N 3/2853 (2013.01); F01N 2310/02 (2013.01); F01N 2310/04 (2013.01); Y02A 50/20 (2018.01)] 15 Claims
OG exemplary drawing
 
1. A method for producing a fibrous mat which is without resin, amalgam, or both and is designed to be installed in a silencer of an exhaust gas system of an internal combustion engine of a vehicle to attenuate noise and heat associated with exhaust gas passing through the exhaust gas system, said fibrous mat is designed to be wrapped around or fitted in associated pipes, tubular perforated partitions, exhaust ducts passing through a chamber of the silencer, the method comprising:
providing a fibrous core by winding a first fibrous bundle around two axes that are perpendicular to a longitudinal axis and are mutually spaced at a distance approximately equal to the length of the fibrous mat so as to form an elongated wound skein that extends along the longitudinal axis; and
wrapping an outer surface of the fibrous core with a second fibrous bundle to form an outer tubular fibrous containment sleeve that extends along the longitudinal axis to internally retain the first fibrous bundle and trap the fibrous core within the outer tubular fibrous containment sleeve;
wherein the fibrous core and the outer tubular fibrous containment sleeve comprise mineral fibers which attenuate the noise and heat transmission due to exhaust gas passing through the exhaust duct, and an inner space of the outer tubular fibrous containment sleeve is filled by the fibrous core, the fibrous core being simultaneously trapped by the outer tubular fibrous containment sleeve;
wherein the first fibrous bundle corresponds to the second fibrous bundle.