Transparent construction form

Abstract

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.

1 . A tubular construction form, comprising: 
 a plurality of flexible sheet material layers wound one upon another about an axis and bonded together so as to form a tube having a wall encircling the axis, all of the flexible sheet material layers comprising transparent polymer film, whereby the tube is transparent such that a settable composition poured into the tube is visible from outside the tube through the wall of the tube.    
   
   
       2 . The tubular construction form of  claim 1 , wherein the flexible sheet material layers are bonded together with an adhesive between the flexible sheet material layers, and the adhesive comprises a transparent adhesive.  
   
   
       3 . The tubular construction form of  claim 1 , wherein the flexible sheet material layers are bonded together by at least partially melting the flexible sheet material layers and fusing the flexible sheet material layers together.  
   
   
       4 . The tubular construction form of  claim 1 , wherein the flexible sheet material layers comprise polyethylene film.  
   
   
       5 . The tubular construction form of  claim 1 , wherein the flexible sheet material layers comprise polypropylene film.  
   
   
       6 . The tubular construction form of  claim 1 , wherein the flexible sheet material layers comprise polyvinyl chloride film.  
   
   
       7 . The tubular construction form of  claim 1 , wherein the flexible sheet material layers comprise polyvinyl chloride film and are bonded together with a transparent adhesive between the flexible sheet material layers.  
   
   
       8 . The tubular construction form of  claim 7 , wherein the adhesive comprises acetone.  
   
   
       9 . The tubular construction form of  claim 1 , wherein the tube comprises from 2 to 20 flexible sheet material layers.  
   
   
       10 . The tubular construction form of  claim 1 , wherein the tube comprises from 2 to 15 flexible sheet material layers.  
   
   
       11 . The tubular construction form of  claim 1 , wherein the tube comprises from 2 to 10 flexible sheet material layers.  
   
   
       12 . The tubular construction form of  claim 1 , further comprising a release material disposed on an inner surface of the wall to facilitate removal of the construction form from the settable composition after setting thereof, the release material being transparent.  
   
   
       13 . The tubular construction form of  claim 12 , wherein the release material comprises silicone.