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A retractable timberclad cinema screen

working details

At the heart of the new Galeri building is an auditorium designed for cinema, theatre or concert use. To allow this degree of flexibility, the cinema screen is constructed from a rigid steel frame that can be raised out of sight automatically or, alternatively, rotated and used as an acoustic reflector.

The lifting and raising of the screen is operated by a remote hand-held console.

While in cinema mode, the screen hangs vertically from three steel chains, each connected to a powered hoist.

The screen weighs 1,500kg, due primarily to the convex timber-clad reflector surface at the rear. This double-skin ply construction ensures rigidity and acts as the acoustic surface.

In theatre mode, the screen is raised vertically and suspended at high level, providing a clear floor space for the stage. In concert mode, there are two positions where the screen can act as either a low-level or highlevel acoustic reflector and the integrated, recessed lighting can be used. Finally, for general use of the auditorium, the screen can be stored at high level .

The screen is fabricated from a series of tubular steel trusses, which are 400 x 400mm at the top, 400 x 350mm at the sides and 400 x 200mm at the base.

The upper and lower frames are connected to three primary fabricated-steel trusses, which provide stability in the centre.

The proprietary projection screen is laced simply into the outer frame and the perimeter edges masked with a traditional cinema-fabric 'valance'. The rear ply face is constructed around 15 curved MDF formers 12mm thick at 600mm centres and clad with two layers of ply sheathing. The outer layer of ply is varnished and, where exposed, the MDF is painted black. All the steel trusses have a black powdercoated paint finish.

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