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damel
Joined: 15 Jul 2007
Posts: 210
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 Posted: Tue Apr 17, 2012 7:01 pm Post subject: |
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| feuser wrote: | | $200 for a sail ... too much, IMHO. |
Agreed but I doubt the vendor will give any kind of refund, maybe a store credit.
| feuser wrote: | | The only way to protect monofilm from UV is by tinting it ... laminate (x-ply) so much more resistant is the UV inhibitor in the glue between the layers ... Remember, monofilm is a monolithic sheet of polyester... |
Feuser, you are spot on I just didn't want to go into too much detail. There are some new UV protection applications that can be used on monofilm either by infusing it into polyester or applying a top layer coat, however I have doubts about it working better than the tinting methods and the UV resistant materials decrease over time in the sun unlike the tinted dies. While monofilm by definition is a single sheet of polyester you will find some materials labeled as monofilm consists of multiple sheets. Manufacturers have found a way to condense polymers in a way that the molecular chains align so the film has more diagonal strength along one direction but not the other. Fusing 2 sheets with opposite diagonal strengths makes the monofilm much stronger and more resistant to tearing. Not sure if the technology has made its way to windsurfing I switched to sails that use x-ply, scrim and a vinyl window a while ago.
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jingebritsen
Joined: 21 Aug 2002
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feuser
Joined: 29 Oct 2002
Posts: 1282
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| Posted: Wed Apr 18, 2012 1:20 pm Post subject: |
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| jingebritsen wrote: | | toughest stuff out there in the windsurf world is technora, then x-ply. pentex is light and UV resistant too, but is not very puncture resistant. pentex was used on larger aerotechs for years. some are still going strong 10 years later. pentex is not as expensive as technora. if used in the upper parts of a sail, one could save swing weight, without spending quite as much money. |
Technora is a fiber embedded between very thin film layers. The fiber itself is very strong and the idea behind using it is to let the fiber carry load, versus an x-ply where the fiber acts as rip-stop only and the film carries the load.
The problem with technora is how to connect the panels, i.e. bring the load into the fiber. I believe some sails using technora in high-load areas are suffering from the stitching tearing through the thin film at the seams. I've heard reports of this happening with recent model Ezzies. Although, I can't imagine that to be an issue if you apply tension in the proper order (i.e. not fully outhaul a sail without downhaul).
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