Impermeable membrane based on flexible PVC for lining pools

Abstract

A process for lining a pool, which includes applying a lining consisting essentially of an impermeable membrane, based on flexible PVC comprising a glass reinforcement, to at least one wall of a pool, in which the membrane comprises two flexible PVC layers placed at least in part on either side of the glass reinforcement. When applying the lining, a rounded part at a base of the wall is provided so that a void forms between the membrane and the wall, serving as an expansion region, so that when swelling of the membrane occurs to form fit the membrane to the wall no wrinkles form in the membrane.

1 . A process for lining a pool, which comprises: 
 applying a lining consisting essentially of an impermeable membrane, based on flexible PVC comprising a glass reinforcement, to at least one wall of a pool,    wherein the membrane comprises two flexible PVC layers placed at least in part on either side of the glass reinforcement;    wherein when applying the lining, a rounded part at a base of the wall is provided so that a void forms between the membrane and the wall, serving as an expansion region; and    wherein when swelling of the membrane occurs to form fit the membrane to the wall no wrinkles form in the membrane.    
   
   
       2 . The process according to  claim 1 , wherein the impermeable membrane has an elongation at break of greater than 20%.  
   
   
       3 . The process according to  claim 1 , wherein the flexible PVC layers comprise a vinyl chloride homopolymer having a K value (Kw) of between 60 and 80 and a phthalate as plasticizer.  
   
   
       4 . The process according to  claim 1 , wherein at least one of the PVC layers includes waste from the production of similar membranes and/or regrind from spent similar membranes.  
   
   
       5 . The process according to  claim 1 , wherein only one flexible PVC layer contains waste from the production of similar membranes and/or regrind from spent similar membranes.  
   
   
       6 . The process according to  claim 1 , wherein the glass reinforcement is a glass mesh.  
   
   
       7 . The process according to  claim 6 , wherein the mesh consists of woven glass fibers having a mesh density of 1×1 to 10×10, the fibers having a weight per 10,000 m of 280-2200 dtex.  
   
   
       8 . The process according to  claim 6 , wherein the mesh consists of glass fibers of 340 to 1100 dtex, woven with a mesh density ranging from 2×2 to 8×8.  
   
   
       9 . The process according to  claim 1 , wherein the glass reinforcement is a glass fleece.  
   
   
       10 . The process according to  claim 9 , wherein the glass fleece has a weight of 50 to 100 g/m 2 .  
   
   
       11 . The process according to  claim 1 , wherein the radius of the rounded part is less than 15 cm.  
   
   
       12 . The process according to  claim 1 , wherein the radius of the rounded part is less than 10 cm.  
   
   
       13 . The process according to  claim 1 , wherein the radius of the rounded part is less than 5 cm.  
   
   
       14 . The process according to  claim 1 , wherein the impermeable membrane is impermeable to water.  
   
   
       15 . The process according to  claim 1 , wherein the membrane comprises two or more sheets welded together at edges of the sheets.  
   
   
       16 . The process according to  claim 15 , wherein the edges overlap.  
   
   
       17 . The process according to  claim 15 , wherein the edges overlap by 2 to 10 cm.  
   
   
       18 . The process according to  claim 15 , wherein the sheets are welded together by hot-air welding.