印刷工艺中的上光和压光工艺（Glazing and calendering process in printing process）

1、印刷工艺中的上光和压光工艺（Glazing and calendering process in printing process）Glazing and calendering process in printing process.TxtGlazing and calendering in printing process (designer must read)This article is dedicated to graphic designers and enthusiastsA. what is glazing?Glazing is on the surface of print

2、ing (or spray, printing) on a layer of colorless transparent coating (polishing oil), after leveling, dry, press light, in the printed surface to form a thin and uniform transparent bright layer. Glazing includes comprehensive glazing, local glazing, luster glazing, matte (extinction) polish and pol

3、ish special coatings, etc.B. why should the printing paper be polished?Glazing is to beautify the printed matter, protect the printed matter, strengthen the propaganda effect of the printed matter and improve the practical value of the printed matter. The printed surface on the polish surface is mor

4、e smooth, resulting in uniform reflection of the incident light, and the ink layer is more luminous. Glazing is the use of varnish on the printing of surface coating processing. Before printing the final processing of the printed material, take appropriate measures to protect the surface of the pape

5、r or board. A bright film is applied to the surface of the printed matter after glazing. Its range of application is:The book, such as jacket, cover, insert, calendar, calendar, advertising, promotional samples, after polishing can make print gloss, bright color.The packing paper products such as pa

6、per bags, envelopes, trademark, Polish resistance to beautify and protect the function of commodity.Third, cultural products such as playing cards, postcards and printing gold pattern, after polishing, can play the role of resistance to mechanical friction and chemical corrosion.Daily necessities, f

7、ood, etc. Such as cigarettes, food, detergent and other trademarks after polishing, can play the role of moisture-proof, mildew.The hard pressed copper foil on the hard cover can make the appearance attractive, and the brightness of the copper foil is very high, and is like the golden color. If the

8、copper and Chicco combination is not solid, after after glazing can obtain good adhesion properties.C. what are the technical requirements for polishing oils?In addition to the ideal oil, colorless, odorless, shiny, dry fast, chemical resistance and other characteristics, but also must have the foll

9、owing performance.The film has high transparency and no color change. Print decoration to get excellent polishing effect, depending on the sheet surface to form a layer of transparent film, and drying the picture color. And not because of the sun or use a long time and discoloration, yellowing.The f

10、ilm has a certain wear resistance. Some glazing products require a certain degree of wear resistance and scratch resistance after glazing. Because of the high speed box making machine, carton packaging machine equipment, books on the book jacket production line process, the printing surface by frict

11、ion, so it must be with wear resistance.Thirdly, it has certain flexibility. Any kind of varnish on the surface of the printed film, bright film must maintain good elasticity, and can be used with paper or paperboard flexibility, without breakage or cracking, fall off.The film has good environmental

12、 resistance. After the printing of some of the products used in the manufacture of various types of packaging boxes, in order to be able to packaging products play a good role in the protection of the requirements of the film layer, environmental resistance must be better. For example: food, cigaret

13、tes, cosmetics, clothing and other commodity packaging must have moistureproof, mildew proof properties. In addition, the drying film has a stable chemical performance. Not because of weak acids or weak bases in the same environment contact with chemical properties change.Have certain adhesive force

14、 to the surface of printed matter. The printing ink layer due to surface integral density value, surface adhesion adaptability is greatly reduced, in order to prevent drying after coating in use, dry film, film requires strong adhesion, and the printing ink and ink with all kinds of accessories have

15、 certain adhesion.The leveling is good, smooth surface. Printing printing materials and printing of various kinds, influence, absorption, surface smoothness, wettability vary greatly, in order to make the coating to form a smooth coating on the surface of the product are different, requirements on o

16、il leveling, film surface smooth.The Postpress eligibility width. Printed matter after polishing, usually also need to be processed after the process, such as: molding processing, hot stamping, anodized aluminum processing. Therefore. Require polishing film finishing, suitable for wide. For example:

17、 heat resistance is better, after the hot stamping anodized aluminum can not produce sticky phenomenon; high solvent resistance; after drying the film can not be affected by the post processing of adhesives and foaming, wrinkling and sticky phenomenon.D. how to choose polishing oil?The choice of var

18、nish must conform to the basic principles of science, economy and practicality.The so-called science, is the physical and chemical properties of glazing and glazing oil conforms to the use of print in. For example: the picture books and periodicals, or the cover of the book jacket, requires not only

19、 transparency and gloss, abrasion resistance, folding resistance is better; food packaging varnish,Requirements must first be non-toxic and has moistureproof and anticorrosive performance of the various types of packaging carton; light oil, chemical stability, can not be placed (sunlight or light) c

20、olor, yellow, or stacked and sticking phenomenon.Economy, refers to the choice of polishing oil, you must do with the printing oil matching, to avoid the use of high-grade varnish processing, low-grade printed matter. For example: high-grade printing polishing processing, can choose high cost, good

21、quality of light pressure, UV curable or acrylic resin as the main agent of solvent based varnish; on the contrary, if the product is printed textbooks and other bulk products, the cost is moderate, the quality can meet the processing requirements of the general solvent based on.Practical, refers to

22、 the choice of glazing and glazing equipment matching. For example, solvent based varnish is only applicable to ordinary machine; UV curing varnish, must be fitted with a UV drying machine; ethanol soluble or water soluble varnish, the machine must meet the requirements on drying oil (General requir

23、ements for drying long more than 6m, the temperature is over 65 DEG C). In addition, it is necessary to consider both labor and material consumption, but also for mechanized mass production, as far as possible to reduce production costs, less investment, more productive. The choice of polishing oil,

24、 but also must pay attention to safety, health and environmental protection requirements. From the safety point of view, should choose good storage performance, not easy to burn polishing oil; from the health and environmental considerations, should be selected odorless, non-toxic, tasteless varnish

25、. The production site and the well ventilated machine, choose suitable wide range, on the contrary, should not be used with aromatic substances as solvent oil, to prevent the effects of the health of the operator and to the environment caused by pollution.E. what are the quality requirements of varn

26、ish coating?In order to obtain the ideal polishing effect, coating process, coating varnish should meet the following requirements: the coating layer is uniform, no blisters, no bubble and no leak painting phenomenon. The coating quantity is suitable, and the coating can finish the drying conjunctiv

27、a at a certain temperature and coating speed. The coating is free from the influence of printing ink performance, printing text area and integral density value. The flow is good and has a certain adhesive force on the surface of printed matter. The coating can adhere to the surface of the pressure b

28、and in the pressing light, and can be easily peeled off after cooling.F. what are the factors that affect the quality of glazing?Factors affecting the quality of glazing are: paper properties, temperature, ink and printing, crystallization and so on.Effect of paper properties on glazing quality. The

29、 influence of paper on the quality of glazing is mainly due to the influence of smoothness on the quality of the coating. Gaoping smoothness of the paper, after polishing effect is remarkable, and smoothness of low paper or paperboard, after polishing the effect is poor, because the varnish is rough

30、 surface of paper or cardboard almost all absorbed. In order to solve this problem, you can finish before the last casein base, or two light.Influence of temperature on glazing quality. The temperature of the glazing is between 18 and 20 degrees centigrade, and the optimum effect can be obtained. In

31、 winter, the varnish is easy to solidify, and the surface of the glaze is uneven. To solve this problem, varnish needs to be kept in a warm place. If the varnish temperature is too low - less than 10, although the oil will be transported to room temperature 20 degrees Celsius room, put a day and nig

32、ht time, still can not use, but also on the varnish solution is appropriately added to the solvent dilution.The influence of printing ink on the quality of printing. After printing, the printing inks used for printing must have solvent resistance and heat resistance. Otherwise, the printed matter wi

33、ll change color or cause wrinkling and skin defects. The solution is to pay attention to the following points in the selection of printing ink: A. should be resistant to alcohols, esters, solvents, acid and alkali ink. B. must wear a durable and glossy ink. C. must select the ink that has good adhes

34、ion to the paper.The influence of printing quality on the quality of printing. Print crystallization phenomenon is mainly due to the printing is placed for a long time, the printing ink bottom area is too large, dry oil to add too much reason, the ink film produced crystallization phenomenon on the

35、surface of the paper, often make up or polish mimeograph painted face pits fault.In order to solve this problem, usually add 5% of lactic acid in the oil, after mixing can be used. The modified varnish is applied to the printed matter, so that the surface of the printed material is glassy and the cr

36、ystal film is damaged, so that the varnish can be uniformly coated on the surface of the printed material to form a bright film.G. what is calendering?Calendering is the glazing process, which is performed on two units: coating, polishing and hot pressing. The first printed coating on the ordinary m

37、achine on the finish, after drying the calender stainless steel with hot pressing, cooling, after stripping, the formation of the specular reflection surface of printing, so as to obtain high gloss.What are the factors that influence the quality of H.?The main factors affecting the quality of calend

38、ering are calendering temperature, pressure and machine speedCalendering temperature. The appropriate calendering temperature can increase the molecular thermal movement ability of the coating film and accelerate the diffusion rate, which is beneficial to the two wetting, adhesion and penetration of the main agent on the surface of the printed material. In addition, the proper