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.

一般印刷畫冊的時候先燙金后上光效果好，因?yàn)榻鹉颖趁嬗姓承耘c印刷的紙張附著牢固，正面性好與Uv光膜附著牢。如果畫冊印刷的工藝只能先上光后燙金，如柔版畫冊印刷機(jī)、不干膠機(jī)，應(yīng)該上uv油后經(jīng)電暈處理再燙金才行，否則易出現(xiàn)金膜脫落現(xiàn)象。

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.

若此現(xiàn)象不嚴(yán)重，一般無重力摩擦是不會脫落的。像說明書，疊放時上下頁摩擦力不大就沒問題。而書就不行，因?yàn)榘b疊放、運(yùn)輸時，上下書相互摩擦?xí)⒔鹉つサ簟Ａ硗獍b盒也不行，因?yàn)榘b盒碼放時，盒挨著盒相互摩擦。

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.