When printing picture books, the selection of glazing machine is coater. Different coating methods have different requirements for coating materials, mainly viscosity requirements. General high speed, low viscosity, such as high-speed picture printing gravure, Flexo machine glazing, printing speed is about 60-200m / min. If the viscosity is high, varnish transferred to the substrate less, and not easy to level, so the viscosity is less than 28s (coated four cups). When the machine speed is 20-50m / min, the viscosity of varnish can not be lower than 35S, generally 35-80s. The viscosity of UV oil is better than 100-200s when using offset printing press and relief machine.
Generally, when printing picture books, the effect is good after gilding, because the back of the gold film is sticky and firmly adheres to the printed paper, the front is good and firmly adheres to the UV light film. If the album printing process can only be polished and then gilded, such as flexographic album printing machine, self-adhesive machine, should be on the UV oil after corona treatment and then gilded, otherwise easy to appear gold film off phenomenon.
If this phenomenon is not serious, it will not fall off without gravity friction. Like the manual, the friction between the upper and lower pages is not big, so it's OK. But books can't, because when packing is stacked and transported, the gold film will be worn off by the friction between the upper and lower books. In addition, the packing boxes are not good, because when the packing boxes are stacked, the boxes rub against each other.濟南印刷廠講解的內容 更多的內容 請咨詢公司官網http://www.703248.com/