Engineering:Inflatable movie screen
An inflatable movie screen is an inflatable framework with an attached projection screen. Inflatable screens are used for outdoor movies, film festivals, drive-in theaters, sports, social, fundraising and other events requiring outdoor projection.
Design
The projection frame is made from PVC-coated fabric layers joined by high-frequency welding or mechanical sewing. The projection surface can be made of PVC or spandex, with the latter providing for rear projection capabilities. The projection surface can be detachable for ease of care. The frame is inflated with a high-pressure air blower. Larger frames may require a three-phase blower. For bigger screens, the blower typically continues to operate, ensuring the screen remains fully inflated. For consumer market and smaller screen sizes, the screen is sealed and does not require a constantly operating air blower.
Screens can be held upright with help of a supporting structure (A-frame or inflatable legs) or with the system of straps and counterweights.
In comparison to traditional and heavy steel constructions, inflatable screens can be set up in a few hours or less, with the smallest screens taking one minute to inflate. This can be useful for environments where wind may be a factor. This is one of the major drawbacks of an inflatable screen. Even a small wind can make these fly like a kite without proper anchoring. Inflatable screens can be deflated quickly adding to their safety. Inflatable screens are lightweight and highly portable compared to other structures used to support screens like a truss or scaffold. A 16-metre-wide (52 ft) screen usually fits on a single pallet. A truss or steel system takes up an entire truck. Inflatable screens reach sizes up to 560 square metres (6,000 sq ft). Another big disadvantage of inflatable screens is the noise created by the continuous blowers.[citation needed]
See also
- Video projector
- LCD projector
- DLP projector
- Drive-in theater
- List of inflatable manufactured goods
- Outdoor cinema
References
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