Greenhouse roof roller - GIF

Greenhouse roof roller.

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Previously:

https://www.homemadetools.net/forum/...437#post104285
https://www.homemadetools.net/forum/...538#post117419
https://www.homemadetools.net/forum/...2939#post97575
https://www.homemadetools.net/forum/...488#post166489
https://www.homemadetools.net/forum/...925#post164177

My brother in-law owns and runs a small greenhouse business, having helped him scence he started it my best guess is this is an insulating blanket for night time. My first thought was a form of shade cloth but these must block all the light where as shade cloth is to limit sun for crop groth or temperature control.