The paper supplied to printers is already treated by paper mills with RH (Relative Humidity) values of 50% and protected with a package suitable to preserve it from hygrometric variations.
Sometimes, if the air humidity is not correct, it becomes difficult to process the paper. On the contrary, if the air humidity is too low, the paper loses the right humidity rate for printing and use.
Inside factories there are many enemies to humidity: heating, air conditioning, high temperatures, air extractors etc.
If the humidity is variable, the paper can lose quality: when it’s too dry, the paper can break or change its dimensions.
Keeping constant humidity in storage zones and in printing rooms will avoid loss in the production.