US 11,911,873 B2
Methods, precursors, and abrasive blasting masks for manufacturing noise attenuating devices
Derek Simpson, Belfast (GB); and Tony Millar, Belfast (GB)
Assigned to Short Brothers PLC, Belfast (GB)
Filed by SHORT BROTHERS PLC, Belfast (GB)
Filed on Jun. 3, 2021, as Appl. No. 17/337,656.
Application 17/337,656 is a division of application No. 15/779,433, abandoned, previously published as PCT/GB2016/053624, filed on Nov. 22, 2016.
Claims priority of application No. 1521075 (GB), filed on Nov. 30, 2015.
Prior Publication US 2021/0283747 A1, Sep. 16, 2021
Int. Cl. B24C 1/04 (2006.01); B32B 7/12 (2006.01); B32B 3/12 (2006.01); B32B 37/12 (2006.01); F02C 7/24 (2006.01); G10K 11/168 (2006.01); B64D 33/02 (2006.01); B32B 3/26 (2006.01); B32B 5/02 (2006.01); B32B 15/20 (2006.01); B32B 5/26 (2006.01); B32B 15/14 (2006.01); B32B 29/02 (2006.01); B32B 15/12 (2006.01); B32B 15/08 (2006.01); G10K 11/172 (2006.01); B32B 7/05 (2019.01); B32B 37/14 (2006.01)
CPC B24C 1/04 (2013.01) [B32B 3/12 (2013.01); B32B 3/266 (2013.01); B32B 5/024 (2013.01); B32B 5/26 (2013.01); B32B 7/05 (2019.01); B32B 7/12 (2013.01); B32B 15/08 (2013.01); B32B 15/12 (2013.01); B32B 15/14 (2013.01); B32B 15/20 (2013.01); B32B 29/02 (2013.01); B32B 37/12 (2013.01); B32B 37/146 (2013.01); B64D 33/02 (2013.01); F02C 7/24 (2013.01); G10K 11/168 (2013.01); G10K 11/172 (2013.01); B32B 2250/03 (2013.01); B32B 2250/04 (2013.01); B32B 2250/40 (2013.01); B32B 2260/021 (2013.01); B32B 2260/046 (2013.01); B32B 2262/02 (2013.01); B32B 2262/0269 (2013.01); B32B 2262/101 (2013.01); B32B 2262/103 (2013.01); B32B 2262/106 (2013.01); B32B 2307/102 (2013.01); B32B 2307/732 (2013.01); B32B 2605/00 (2013.01); B32B 2605/10 (2013.01); B32B 2605/18 (2013.01); B64D 2033/0206 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for manufacturing a noise-attenuating device, the method comprising:
bonding a facing sheet to a cellular core so that an inner side of the facing sheet faces a first side of the cellular core;
producing an abrasive blasting mask by:
applying a photosensitive masking material on an outer side of the facing sheet; and
selectively exposing the photosensitive masking material to light configured to activate the photosensitive masking material, wherein selectively exposing the photosensitive masking material to light comprises projecting one or more images on the photosensitive masking material; and
after bonding the facing sheet to the cellular core, perforating the facing sheet by abrasive blasting the facing sheet, the one or more images being configured to cause the formation of one or more holes in the photosensitive masking material in a region not overlapping the structure of the cellular core and substantially avoid the formation of holes in the photosensitive masking material in a region overlapping a structure of the cellular core.