What kind of curtains/drapes are these?

[4719hike]

I have a pair of pinch-pleated drapes, 8'H x 16'W. They are off white canvas, appear to have a very thin layer of rubber on the back, and are pretty heavy (I'd say each panel weighs 9 or 10 pounds). They do block light, but I was wondering if they might also be intended to block sound. Also, what would be the best way to clean and ship them? Any info/key words suggestions would be greatly appreciated. TIA

[janetpjohn_la]

I think they're called insulated or thermal back, not for sound, but to better keep outside temperatures outside. There are plenty of cleaning tips online.
Janet

[4719hike]

Thanks!