(19)

(11)

EP 3 638 071 A1

(12)

(43) Date of publication: 22.04.2020 Bulletin 2020/17 (21) Application number: 18733687.0 (22) Date of filing: 31.05.2018

(51) International Patent Classification (IPC):  A45D 8/34(2006.01) A45D 8/40(2006.01) (86) International application number: PCT/IB2018/053904 (87) International publication number: WO 2018/229585 (20.12.2018 Gazette 2018/51)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 14.06.2017 IT 201700066188 (71) Applicant: Politecnico di Milano 20133 Milano (IT)	(72) Inventor: PAOLETTI, Ingrid 20123 Milano (IT) (74) Representative: Di Bernardo, Antonio et al Thinx S.r.l. P.le Luigi Cadorna, 10 20123 Milano 20123 Milano (IT)