Transparent construction form

Details Transparent construction form Transparent construction form

B - Operations, Transporting

28

B

B28B 21/76 (2006.01) B32B 1/08 (2006.01) B32B 27/28 (2006.01) E04G 13/02 (2006.01)

Patent

CA 2534177

A wound construction form comprising a plurality of flexible sheet material layers wound one upon another about an axis and bonded together to form a tube, wherein all of the flexible sheet material layers comprise transparent polymer film. The tube thus is transparent such that a settable composition poured into the tube can be seen through the tube wall. If an air bubble is present adjacent the wall, it can be eliminated while the composition is still fluid by puncturing the wall with a small hole at the bubble so that the air can escape and the composition can fill the void.

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