Why does my vinyl background look like this?

wonderer

wonderer

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RMP_7808 by Wonderer1981, on Flickr


It has over the last month or so just decided it want to sag like this. I did see another post similar to this a while back but I cant find it for the life of me. Any idea what has caused this and more importantly what can be done to even it out? It is only affecting the left side of the vinyl.

The vinyl has been hung constantly as it is in a permanent studio room and is still on the original aluminium tube it came on! Would rolling it tightly back on the tube and leaving it for a few days help? Its really annoying and surprising how much it affects the image*

* Obviously this is an unlit shot just to show the effect!
 
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Is the pole still straight or has the weight of the vinyl bent it slightly? I'm guessing there is a fair bit of weight which is only supported at each end.
When I was researching background I read quite a few instances of this which eventually convinced me paper was better for my low use applications.
 
Don't forget over the last 3 weeks we've seen some extreme humid weather, it's done the same to one of my rolls, nothing to worry about too much, see if you can anchor it at the back bottom with some velcro just to add a bit of tension :)
 
Thanks for the replies guys, yes I guess it probably is the heat but not sure why it would only affect the one side? Do you think it would help to roll it up tightly when its not being used?
 
Rolling it up may help, the reason it's not all affected is possibly due to the draft, even in my office at home when using canvas to print, that stuff can slightly warp if you don't keep it in the packaging sleeves etc!

And currently right now I've got the fan on full blast and still can't seem to cool down - already drank 6 stubbies and that's not helping :)
 
I may be wrong, but I feel that if the vinyl was rolled the opposite way (ie drops down from the bottom rather than going up and over like yours) this would offer a more taught solution and possibly solve the problem. Just a thought,
 
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