For the PET bottle blowing,Air Dryer, is also a necessary equipment. Why should we use Air Dryer? There are two reasons:firstly,the vapor in the compressed air will erode machine’s air flowing pipe and pneumatic elements;secondly,the vapor in the compressed air will take bad effect on bottle’s quality because of the strong hygroscopic characteristic of PET resin.So,in order to ensure blow molding machine’s long working life and nice running condition, and to guarantee bottle’s high quality,we have to use air dryers to remove the moisture in the compressed air.