Relevant adjustment requirements before printing       In the packaging and printing industry, printing manuscript plate making needs four-color electrical separation. Apple computer color separation originals include reflection originals (such as color photos, originals, watercolor paintings, oil paintings, traditional Chinese paintings, New Year paintings, gouache paintings, etc.) and transmission originals (such as color reversal films (natural color positive films), color negative films, etc.).Relevant adjustment requirements before printing.       The brightness of the color negative original is opposite to the original, and the color is complementary to the original. For example, the opposite color of red complementary on the negative is green, the opposite color of yellow complementary is blue purple, and the opposite color of red complementary is blue. The light and shade on the positive manuscript are the same as the original, and the color is the same as the original.Relevant […]

Quality discrimination of polishing oil      In the packaging and printing industry, it is often necessary to identify the varnish. Theoretically, the chemical composition of the varnish should be measured. From the perspective of application, a simple method is used to check the quality of polishing oil purchased by users.Quality discrimination of polishing oil.         Smell the smell. The solid content of UV oil is more than 95%, and the volatility of solid content is very small. Therefore, a good varnish tastes less than printing ink. The smaller the odor after curing, the better.Quality discrimination of polishing oil.         Measure the solvent content. Put the polishing oil into a graduated vessel (diameter less than 50mm), place the paper for 12h, and observe how much volatilized. Generally, there is no decline in the position of the surface. If a significant decrease is observed, it indicates that there are too many solvents in the varn […]

Steps to be done before film output       Film output may be used in the packaging and printing industry. Of course, some problems and steps need to be paid attention to when outputting film.Steps to be done before film output. 1. Format of documents      At present, most of the output centers adopt the square grid (pspnt) dot color separation output system, and some adopt Harlequin or Israel’s saiangel and other systems. However, there are similarities to supporting postscrit printer documentation.Steps to be done before film output.      That is, the suffix is. PS file. Currently popular design software: Photoshop, PageMaker, CorelDRAW, illustrator, etc. support PS printing. S2, PS2 and PS files generated by founder software such as founder book edition, thinking and leap can only be output by pspnt, which is not supported by other output systems.Steps to be done before film output.      In addition, word, WPS2000 and other language processing software can theoretically generat […]

Offset overprint deviation control method     In some small and medium-sized packaging printing enterprises using single and two-color offset presses, the overprint deviation of four-color color printing is often a headache for workers. The front two-color overprint is generally no problem, but the overprint accuracy of the back two-color is more difficult to control.Offset overprint deviation control method.    Generally, measures such as reducing mechanical speed, reducing ink volume, adjusting ink fluidity and powder spraying can only be taken, but the effect is also great. The above measures affect work efficiency and product quality. At the same time, the operation is complex and greatly improve labor intensity.Offset overprint deviation control method.     In fact, overprint technology can be divided into dry overprint and wet overprint. The so-called wet printing refers to that both inks during printing are wet ink, that is, the previous color has just been printed, th […]