The color inkjet paper ink coating

At present, the color inkjet paper ink coating is basically divided into resins and pigments. Resin ink coating is mainly composed of some polymer swelling which has strong ability of absorbing ink; pigment ink coating containing special pigment, a large number of micropores in the coating, so as to realize the rapid absorption of the ink and color.

(1) selection of pigments
The specific surface area, pigment ink suction and liquid transfer amount will impact the size of the coating ink absorbency and image dot roundness, absorption coefficient and scattering coefficient of pigment will affect the optical density and bright image, so in order to meet the characteristics of color inkjet printing paper, a selection of large surface area, a large quantity of ink absorption, liquid transfer capacity, absorption coefficient and scattering coefficient of small coating pigments.

Under the same conditions, the main pigment liquid transfer amount of the order is: > > silica synthetic silicate precipitated calcium carbonate > clay, wherein the liquid silica in 0.01s transfer within the maximum amount of up to about 15mL/m2; silica, calcium carbonate, titanium dioxide is the size of the light scattering coefficient of the order is: silica calcium carbonate. < titanium dioxide; absorption coefficient of the size of the order is: > > titania silica calcium carbonate. Therefore, the comprehensive comparison, small particle size, large specific surface area, high oil absorption of silica is a more appropriate pigment.

(2) selection of adhesive
The main function of adhesive in pigment coating in addition to pigment coating substrate bonding on the outside, but also on the paint viscosity, rheology, release plays an important role in water and curing time of coating adhesive properties, the content and distribution of optical properties of color inkjet paper and ink absorption effect on the great.

At present, color inkjet printing paper adhesive commonly used with starch, polyvinyl alcohol (PVA), ethylene vinyl acetate copolymer (EVA), carboxymethyl cellulose (CMC) and styrene butadiene latex, acrylate latex, polyvinyl pyrrolidone (PVP) etc.. The PVA has the advantages of strong adhesive force, high transparency, crosslinked water resistance, good compatibility, but also can be used as a carrier coating stabilizer, fluorescent whitening agent, in the modulation of inkjet paper coating is preferred. In addition, in the actual production, in order to avoid due to the increase of solid content coating caused by paint viscosity increased sharply, influence of coating rheology, should use can be partially hydrolyzed (degree of hydrolysis was 87% ~ 89%), the relative molecular mass is low, low or moderate levels of PVA.

(3) selection of adjuvant
In order to further improve the printing performance and other physical properties of color inkjet printing paper, some auxiliary agents should be added to the coating. The common auxiliary agents are dispersing agent, defoaming agent, water proofing agent, ultraviolet absorbent and anti-aging agent.

Characteristics of color inkjet printing paper

Color inkjet printing paper is very different from ordinary inkjet printing paper, this is because the color inkjet printing usually use water-based ink, rapid absorption and diffusion will generally receive paper as long as water-based ink, results from both color or from the definition are not up to the requirements of printing. The color inkjet printing paper is paper products deep processing, it is the ordinary printing paper surface through special coating processing, make it not only can absorb the water ink and make the ink droplets spread to the surrounding, so as to maintain the original color and clarity. The types and characteristics of the commonly used color ink-jet printing paper are as follows:

(1) special inkjet printing paper support for RC paper, which is containing fluorescent agent and magnetic materials, so it is fake and anti copy security function, but it also has UV resistance and light resistance characteristics, so it is especially suitable for a photo like effect picture output production and construction;

(2) PVC inkjet printing paper support for composite plastic film and paper, the mechanical strength of the paper, the output image has high quality, good ink absorbency, and indoor good light resistance, so the printing paper is suitable for a photographic effect picture output device;

(3) high gloss inkjet printing paper with a thick base, there are photos of the same high gloss, whiteness of paper, with good ink absorption. Because of its rich image output levels, full color, especially suitable for photo image output and advertising display production;

(4) high gloss inkjet printing paper support for RC paper base, with high resolution, generally in 720dpi. Therefore, the use of it to print the image clear and bright, good gloss, interior furnishings with good light fastness and color fastness of the single. Often used for bright colors, there is the effect of photographic image output, and the general use of the time are equipped with high-grade inkjet printer;

(5) the inkjet printing paper support for the RC paper base, medium gloss, high resolution, it is full of bright colors, good light resistance, suitable for photographic image output.