Why shall we need the stretcher for the oil paitings?

There are many advantages of the stretcher ,now a brief description for you.
Oil paintings stretcher can draw a flat for the paintings,it can keep the paintings in good looking,also a flat paintings is very suitable for the laster frame.
Stretcher also has a main purpose is moisture-proof, especially in the moist region, spring is the very moist season of the year.With the stretch,the oil paintings can effectively prevent water seepage to canvas,It can keep the oil paintings storing for a longer time.
Sometimes, we may just make the stretcher without the frame,this kind of oil paintings looks simple and easy to hang.Also it is cheaper than the oil paintings with frame.So the oil paintings with stretcher are very popular nowadays.
The article is from http://www.oilpaintingart-gallery.com/