国产亚洲av片在线观看18女人,9久9久女女热精品视频在线观看,国产AV无码专区亚洲AⅤ蜜芽,亚洲熟妇中文字幕五十中出

In order to improve the surface properties of the PET film, in order to improve the adaptability of printing and the binding force of the vacuum aluminum plating layer, a corona treatment method is generally used to increase the surface tension of the film. However, the corona method has problems such as timeliness, and especially in a high-temperature and high-humidity environment, the film tension after corona treatment is easily attenuated. However, the chemical coating method does not have such a problem, so it is favored by the printing industry and the aluminum plating industry. Some domestic companies have developed PET chemical coating products: if coated with water-soluble polymers, the surface tension of PET films can be increased; coating with acrylic emulsions can improve the adaptability of printing (water-soluble inks can be used) ; Coating with polyurethane aqueous solution can strengthen the binding force of the aluminum plating layer and the PET base film, and increase the thickness of the aluminum plating layer. In addition, the coating method can also be used to produce high-resistance films and antistatic films.