US 12,257,131 B2
Method for producing an elastic composite web and elastic composite web
Guido Bonelli, Pescara (IT)
Assigned to Fameccanica.Data S.p.A., San Giovanni Teatino Chieti (IT)
Appl. No. 17/611,242
Filed by Fameccanica.Data S.p.A., San Giovanni Teatino (IT)
PCT Filed May 12, 2020, PCT No. PCT/IB2020/054462
§ 371(c)(1), (2) Date Nov. 15, 2021,
PCT Pub. No. WO2020/230012, PCT Pub. Date Nov. 19, 2020.
Claims priority of application No. 102019000006819 (IT), filed on May 16, 2019.
Prior Publication US 2022/0211548 A1, Jul. 7, 2022
Int. Cl. A61F 13/15 (2006.01); A61F 13/49 (2006.01); B32B 3/26 (2006.01); B32B 3/28 (2006.01); B32B 5/04 (2006.01); B32B 7/12 (2006.01); B32B 37/14 (2006.01); B32B 38/00 (2006.01)
CPC A61F 13/15593 (2013.01) [A61F 13/15699 (2013.01); A61F 13/4902 (2013.01); B32B 3/266 (2013.01); B32B 3/28 (2013.01); B32B 5/04 (2013.01); B32B 7/12 (2013.01); B32B 37/144 (2013.01); B32B 38/1875 (2013.01); B32B 2250/03 (2013.01); B32B 2250/40 (2013.01); B32B 2555/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for producing an elastic composite web comprising a first corrugated web and a second corrugated web provided with ridges alternating with depressions and connected to each other at said depressions, and at least one elastic element entrapped between said first corrugated web and said second corrugated web, wherein said method comprises:
a corrugation step of said first web and of said second web by means of respective corrugating devices each provided with at least one corrugation surface configured to form said ridges alternating with said depressions along a reference direction, so as to obtain said first corrugated web and said corrugated second web, and
an entrapment step of said at least one elastic element between said first corrugated web and said corrugated second web, connecting together said first corrugated web and said second corrugated web at said depressions,
wherein the corrugation step is carried out before said entrapment step and involves feeding said first web and said second web towards the respective corrugating devices with a feeding speed greater than respective movement speed of said corrugation surface so as to generate the ridges alternating with said depressions of the first and second corrugated webs without stretching the first and second webs, and
wherein said entrapment step involves entrapping said at least one elastic element while it is under tension along said reference direction.