US 11,806,811 B2
Method for producing a shaped sheet of wrapping
Sergio Mansuino, Castiglione Falletto (IT)
Assigned to SOREMARTEC S.A., Senningerberg (LU)
Filed by SOREMARTEC S.A., Senningerberg (LU)
Filed on Dec. 8, 2020, as Appl. No. 17/115,172.
Claims priority of application No. 101585 (LU), filed on Dec. 30, 2019.
Prior Publication US 2021/0197321 A1, Jul. 1, 2021
Int. Cl. B23K 26/40 (2014.01); B23K 26/38 (2014.01); B23K 103/00 (2006.01)
CPC B23K 26/40 (2013.01) [B23K 26/38 (2013.01); B23K 2103/50 (2018.08)] 16 Claims
OG exemplary drawing
 
1. A method for producing a shaped sheet of wrapping (10), comprising a hollow portion (10A) and a perimetral edge (10C) that extends along a pre-set profile (K), said method comprising the steps of:
laying a sheet of wrapping (100) on a treatment surface (50) having a forming cavity (50A); and
forming said sheet of wrapping (100) within said forming cavity (50A) so as to reproduce a shape of said hollow portion (10A) thereon,
wherein said forming step includes an action of insertion of said sheet of wrapping (100) into said forming cavity (50A), without subjecting said sheet of wrapping (100) to deformation by stretching at least for a phase of said action of insertion, said formed sheet (100) having a plurality of folds (110) consisting of two or more layers set on top of and in contact with one another of said sheet of wrapping (100);
cutting said formed sheet of wrapping (100) along said pre-set profile (K) for producing said perimetral edge (10C) and obtaining said shaped sheet of wrapping (10);
wherein said step of cutting said formed sheet of wrapping (100) along said pre-set profile (K) comprises the use of a laser source (60) designed to emit a laser beam (B), and includes applying said laser beam (B) on said formed sheet (100) and orienting said laser beam so as to carry out a plurality of passes of said laser beam along said pre-set profile (K), wherein said plurality of passes comprises:
a first pass of said laser beam that follows a first path (P1), wherein following said first path (P1) comprises moving the center of said laser beam to different positions along said first path (P1); and
at least one further pass of said laser beam that follows a further path (P2, P3, . . . , Pn) different from said first path (P1) and that is shifted from said first path (P1), in a direction away from said pre-set profile (K), by a given distance (d1, d2) such that the laser beam that follows said further path (P2, P3, . . . , Pn) can operate on an underlying layer of the formed sheet (100) that still connects said shaped sheet (10) to a residual portion (100′) of said sheet of wrapping (100) and that emerges on a side where the laser source is located as a result of said first pass of said laser beam, wherein following said further path (P2, P3, . . . , Pn) comprises moving the center of said laser beam to different positions along said further path (P2, P3, . . . , Pn).