Patent ID: 11911873
Assignee: SHORT BROTHERS PLC
Field: Surface technology, coating (Chemistry)
Classification: CPC B  F  G | IPC B  F  G

Claim 12:
13. A precursor for manufacturing a noise attenuating device, the precursor comprising:
a cellular core having a first side;
an imperforated facing sheet having an outer side and an inner side, the imperforated facing sheet being bonded to the first side of the cellular core so that the inner side of the facing sheet faces the first side of the cellular core; and
a mask overlaying the outer side of the facing sheet and configured to substantially prevent abrasive blasting of the facing sheet at locations where the facing sheet is to remain imperforated, the mask being produced 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, 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.