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The process of manufacturing blackout was invented by Baltimore-based Rockland Industries, [2] and involves coating a fabric with layers of foam, or 'passes'. A '2-pass' blackout is produced by applying two passes of foam to a fabric – first, a black layer is applied to the fabric, then a white or light-colored layer is applied on top of the black.
A blackout during war, or in preparation for an expected war, is the practice of collectively minimizing outdoor light, including upwardly directed (or reflected) light. This was done in the 20th century to prevent crews of enemy aircraft from being able to identify their targets by sight, such as during the London Blitz of 1940.
Another common occurrence of greyouts is in roller coaster riders. [ citation needed ] Many roller coasters put riders through positive g-forces, [ 4 ] particularly in vertical loops and helices . Roller coasters are unlikely to have high enough negative g-forces to induce redouts, as most low-g elements are designed to simulate weightlessness.
Speeds range from 18 square meters per hour in a smaller 44 in wide printer to over 3,000 square meters per hour in a high-speed industrial textile printer. Direct dye-sublimation fabric printing In this type of digital textile printing , an inkjet printer is used to print dye-sublimation inks directly onto the fabric.
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