Ink fountain coating product introduction

Introduction

The main function of coating glazing is to protect the printed products, and also to obtain different printing effects of the products, increase the sense of beauty, and thus increase the value of the printed products. In addition, it can also meet the needs of post-processing. (eg, applied to blister packaging, indentation, laminating, etc.)

There are basically three types of glazing methods: an individual glazing machine, an on-line glazing machine for printing presses, and a printer ink fountain unit for glazing, and ink glazing is the focus of this article.

Use ink scoops to hold ink fountain light in ink fountain


The use of the ink fountain coating is similar to the use of printing inks. The ink is used to dip the varnish into the ink fountain. The varnish can be glazing after the varnish is turned on. Varnish is brought to the printing plate through the ink cartridge, and then transferred from the plate to the blanket, and finally pressed onto the paper. The ink fountain coating technology has been used for a long time. Because its products have been constantly updated and updated, and there are various types of products, manufacturers do not need additional investment or equipment, so they still have certain advantages in the market.



NAPPcoat resin version has a solid aluminum layer, which can improve the accuracy of the local coating.

Ink fountain polish type

In order to meet the requirements of various printing glazing, ink fountain products are also different. There are roughly three types of ink fountain coating products in terms of material composition:

(a) Oil-based

In general, the oil-based varnish has a solid content of 70%, and the rest is a volatile solvent. Similar to the ink, it is dried by oxidative polymerization and generally takes 24 hours to completely dry. Its yellow color is more pronounced after drying. Because of the slow drying, it cannot be processed or shaken at once, otherwise it will stain the prints. The print speed cannot be too fast, and the paper stack cannot be too high, otherwise sticking or bottoming may occur. However, the oil-based ink fountain polish also has its advantages: it can be used for partial or full-screen coating with the PS plate using the principle of offset printing.

(b) watermiscible-based

Water-soluble ink fountain coating is divided into two types: water base and non-water base. Water-based ink fountain coating oil, also known as emulsion ink fountain coating oil, in general, 60% of water, solids content is only 40%, non-water-based ink fountain coating oil is mainly composed of the connecting material and polymer. Both glosses are transparent, not yellowish, and are mainly dried by penetration, evaporation and polymerization. It is almost completely dry within 15 minutes and neither will turn yellow after drying. Because it is a water-based product, it is necessary to operate under water-free conditions to prevent the effect of blisters on varnish during printing. That is, using ordinary PS plates for full-plate coating or graphic coating (such as partial coating) does not require investment in special equipment or special treatment.



The varnish on the offset printing plate is transferred to the blanket, and the varnish of the blanket is transferred to the paper.

Ink fountain oils can be processed by engraving polyblankets or using special photosensitive resin reliefs such as NAPP coat plates. The former can be obtained by manually cutting or cutting a resin plate with a CAD platform plotter to obtain a concave and convex effect. The raised portion is a portion to be locally applied, while the recessed portion becomes a non-glazed portion because it is not stained with varnish. However, since the resin cutting plate can only be cut in a large area, it cannot be used for fine partial coating. The latter can be used to obtain more fine raised graphics through water treatment after printing, so it can be used for more demanding local coating production.



In the picture, there is no varnish protection and it is easily wiped.


(C) Ultraviolet (UV)

The solid content of the ultraviolet ink fountain varnish accounts for almost 100%. The drying method is similar to that of the UV ink. For example, the UV ink needs to be irradiated with ultraviolet light to dry, and the UV ink is dried immediately after being irradiated. However, the use of UV inks will require additional auxiliary equipment and consumables. For example, there are UV lamps and exhaust pipes at the post-print paper outlet (UV lamps will emit harmful odors), and even ink cartridges for UV inks will be used. Blanket, fountain solution and cleaning agent. UV ink fountain coating can be used for partial or full-version coating by offset printing PS plate. UV ink fountain oil gloss can be very high, but generally somewhat yellowish, will affect the print color, especially in some spot colors such as Pantone violet and color light blue and other special colors, the color change is more obvious.

to sum up

From the glazing effect point of view, ink fountain coating can have different characteristics, such as different gloss (bright, special high light, extinction and matte), color (usually transparent is better), wear resistance (according to India Live demand, some printing products require particularly high), viscosity (or flow resistance) and drying time (the faster the drying, the faster the next process). Waterborne oils are more environmentally friendly because they are more environmentally friendly, contain no toxic substances, and dry faster than oil-soluble oils. At present, Heidelberg China Co., Ltd. provides a variety of ink coating products, such as water-based ink coating oil W110 (high light) and W290 (extinction), are special quick-drying products, and non-water-based water-soluble Varnish W650 (bright) and W170 (Extinction) are very popular products.