The image receiving layer of the microporous medium does not need expansion and can suck ink. Microporous coating structures similar to bee honeycombs. Because the coating does not need expansion, it can absorb ink, so it can ensure high efficiency ink absorption and good water repellency, so the medium avoids all disadvantages of the expansion medium and has excellent ink absorption property. In fact, the surface layer attracts ink so quickly that it effectively avoids the intermixing of various colors in ink and the formation of ink droplets.
The expansion of class and class paper micropore weight range is generally 260 - 300 g / m2, the two types of paper can avoid the folds of the above question, different from the two kinds of cast coated paper, coated paper base paper class PE (polyethylene), or RC (Resin Coated) coating, which makes the ink can not penetrate the paper base to avoid wrinkles generated. As with PE/RC coated paper based on the traditional silver halide photographic paper base paper is exactly the same, this kind of paper in paper thickness, hardness and smoothness etc. with the traditional silver halide photographic paper no two what kind of. Because the paper substrate with PE/RC coating ink, in the image quality depends on the image formed by the decomposition of medium receiving layer characteristics, usually a variety of print media image receiving layer large individual difference characteristics. For expanded media, the image receptive layer is mainly formed by soluble Polymer (polymer). When the ink falls on the surface of the photographic paper, the Polymer will expand so that it can absorb ink. This is a contradictory process, it is difficult to ensure that the medium with ink and good waterproof performance, because the Polymer coating is quick drying means that its water solubility is strong, so although the swelling medium has good optical density, but its drawback is that after printing, slow drying, and after the loss of print medium gloss, but also curl, not waterproof.
Cast coated class paper weight usually in the range of 170 - 197 g / m2, the image of poor quality paper, this is because the light density and gloss it is relatively low, and the paper based direct ink, so after printing paper will appear wrinkles to some extent, but because of its print the basic quality is acceptable, and the production cost is low, so the market demand, can be used as a substitute for high-end products.
