The color range of raw cotton is from raw white to a rather yellowish color. The bleaching process is intended to bleach the cotton to white and also detach or break down adhering leaf particles. As a rule these days, peroxide is use in temperature steps up to boiling. For an optimal process, the web must also here run centrally through the machine without any creases. A web tension control is very important, above all for elastic materials. The sensors for the web guiding must be suitable for boiling temperatures and be resistant to corrosive chemicals.
