Patent ID: 8591213
Filing Date: 2013-11-26
Classification: D01D,D04H,Y10T

Abstract:
1. An apparatus for the production of a non-woven fabric of filaments, comprising a spinneret ( 2 ) to extrude a plurality of filaments, a cooling chamber ( 3 ) to cool said filaments, a stretching duct ( 7 ) located below the cooling chamber to stretch said filaments and a means for collecting the stretched filaments, wherein said means for collecting comprises a gas permeable mobile support element ( 28 ), at least one aspirator ( 29 ) and a plurality of aspiration ducts ( 33 C- 36 C), to define a plurality of corresponding aspiration areas ( 33 - 36 ) on the mobile support element ( 28 ) through which air is drawn by the at least one aspirator ( 29 ) while depositing the stretched filaments on the gas permeable mobile support element ( 28 ) in a deposition area ( 33 , 34 , 38 ) to form a layer of filaments as a non-woven fabric of filaments, characterized in that said collecting means is provided with pneumatic insulation means to avoid inflow of ambient air from entering the deposition area ( 33 , 34 , 38 ) on said mobile support element ( 28 ), and wherein said pneumatic insulation means comprises a containment case ( 100 ) encompassing at least part of said mobile support element ( 28 ), a first pair of pressing cylinders ( 30 A, 30 B) forming a calender through which said non-woven fabric deposited on the mobile support ( 28 ) is made to pass, comprising furthermore an area of aspiration ( 41 ) external to said cylinders ( 30 A, 30 B), said first pair of cylinders ( 30 A, 30 B) being partially lodged within said containment case ( 100 ) downstream of said deposition area ( 33 , 34 , 38 ), and wherein said gas permeable mobile support element comprises a belt ( 28 ) that exits the containment case ( 100 ) by passing between said first pair of cylinders ( 30 A, 30 B), and further comprising a second pair of cylinders ( 30 C, 30 D) partially lodged within said containment case ( 100 ) upstream of said deposition area ( 33 , 34 , 38 ), and wherein said belt ( 28 ) enters the containment case by passing between said second pair of cylinders ( 30 C, 30 D).