... body,the ultrasonic system resolve the problem that double sides PE coated paper can not be sealing ... raw material.Main Technical Data:· Paper Cup Sizes: 3,4,5,6.5,8,9,10.5, ... sizes· Row material: Single side(one side) or Double Sides PE(polyethylene) film coated paper· Suitable paper weight ... paper weight(the paper thickness),Finished Products' Usage:Double sides PE coated paper cups are widely used ...