How to animate after simple deform? I want to animate a folding sheet:



I locked the locrotscale without any bend that is at deform bend angle =0°. 
But when I change this angle to 90° for the next key frame the object seems to capture the angle and apply to the intial key frame, which I have animated with 0°.
You can deform the object to it's final shape first, and then you select APPLY AS SHAPE KEY.
Then, go to the vertex group menu, and select SIMPLE DEFORM under SHAPE KEYS
Finally, you will see a slider named VALUE. turn automatic keyframe on, and then start deforming the object through time.
In that way you don't even need armatures