to coat and dry twice can prevent transmission of light by keeping the respective separate coating layers and maximize the effects of the respective coating liquids furthermore through this method the second coating liquid can be firmly fixed on the first coating liquid next how to carry out the u201c s u201d coating or the u201c r u201d coating will be described the coating liquid of 62 g to 69 g is used per 1 yard with the width of 65 inches and an interval of a coating knife from the surface of the fabric during coating is 1 5 mm the room temperature of the drying room for drying the coating liquid is kept in a range of 170 u00b0 c to 190 u00b0 c the surface tension of the fabric is kept in a relatively loose condition as much as the knife interval of 1 5 mm so that the coating liquid can be coated satisfactorily if the surface tension is too strong the coating liquid is coated too thin and the fabric may be shrunk again after the completion of the product and hence the surface tension is to prevent tunneling between the fabric and the backer after the fabric and the backer are laminated together the coating liquid of 34 g to 41 g is used per 1 yard with the width of 65 inches and an interval of a coating knife from the surface of the fabric during coating is 2 mm the room temperature of the drying.