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Photo paper classification


Silver salt printing paper is the traditional sense of the paper, with a certain wet strength, acid, alkali thick paper, high stiffness, folding endurance. The paper is coated with photosensitive emulsion, imaged by light irradiation and chemical phase development, and the image can be maintained for a long time.

1. Silver salt photographic paper

Silver salt printing paper is the traditional sense of the paper, with a certain wet strength, acid, alkali thick paper, high stiffness, folding endurance. The paper is coated with photosensitive emulsion, imaged by light irradiation and chemical phase development, and the image can be maintained for a long time. In the use of high-quality photographic base paper evenly coated with a layer of barium sulfate and alum adhesive made of coating on the barium paper, coated by gelatin and silver halide made of photographic emulsion, and then in the emulsion coating on the application of a layer of protective film. By changing the ratio of silver halide and gelatin in the photographic emulsion, controlling the curing conditions and adding sensitizing pigments, the paper with different sensitivity was obtained. According to the different types of photosensitive agent in the coating emulsion, it is divided into different types of printing paper. For example, monochrome printing paper has slow-sensitive printing paper (the main component is silver chloride), bromine printing paper (the main component is silver bromide), chlorine bromine printing paper (silver bromide and silver chloride) and so on. Color printing paper is made by coating three kinds of light color silver salt emulsion on base paper or barium paper in layers.

At present, the types of silver salt photo paper on the market include ① smooth photo paper: high brightness, good reflectivity, but easy to get fingerprints, its clarity is the best, generally suitable for product photos, art photos and landscape photos; ② suede photo paper: the surface is rough, no reflection, not easy to get fingerprints for longer storage time, but the degree of transparency is lower than smooth photo paper, suede photo paper is softer, especially suitable for showing people; ③ silk photo paper: the surface is the effect of silk cloth, with silk texture, silk fabric luster under the light, gorgeous and delicate, very three-dimensional.

2. Inkjet printing photo paper

Inkjet photographic paper is a receiver of ink ejected from the nozzles of an inkjet printer on which an image or text is recorded. Its basic characteristics are fast ink absorption speed and non-diffusion of ink droplets. Specific requirements: ① Good recordability, strong ink absorption, fast ink absorption speed, small diameter of ink droplets, and approximate circular shape; ② Fast recording speed, I .e. high density, continuous gradation and clear picture; ③ Good preservation, certain water resistance and light resistance of the picture, and certain preservation and fastness indoors or outdoors; ④ The coating has certain fastness and strength, the coating is not easy to scratch, no static electricity, has a certain degree of smoothness, bending resistance, folding resistance.

Inkjet printing paper according to its characteristics is divided into: ①. Cast coating: using micron silica process, brightness and whiteness can reach the level of traditional photo paper, but the paper base is paper base. Expansion type: Polyolefin (PVA) material is mainly used to form a Penrun-shaped coating and apply it to the base paper; ③. Microporous technology: RC coated photo paper uses silica technology to form inorganic-organic composite particle ink. After printing, it is immediately absorbed by similar honeycomb micropores, which is called microporous photo paper. The paper base uses the same paper base as the traditional photo paper, and the two sides of the base paper are coated with waterproof PE coating called RC waterproof photo paper.

3, Printing photo paper

Printing photo paper is a digital printing substrate, its surface and electronic ink has a good affinity, can make the electronic ink firmly fixed on the substrate surface, in addition to printing photo paper has a good waterproof and anti adhesion, after printing image has sufficient reflection density. Printing photo paper according to its surface characteristics are divided into three categories, respectively: 1. double-sided fine velvet digital printing photo paper, printing effect is smooth and delicate, double-sided can be printed, mainly used for photo albums and photo books and other high-quality image output applications. 2. Han Rong digital printing photo paper, printing images soft, generally used for high-end image output, such as landscape photography, art photos and other applications. 3. Pearlescent digital printing photo paper, with excellent pearlescent effect, reflecting elegant and shiny texture, is mainly used for high-quality portrait output, product brochures, creative works display and high-grade atlas production.

Digital printing photo paper is currently available in the world, and only three countries can produce it. They are Gulou in Germany, Mitsubishi in Japan and Lucky in China. Among them, Gulou in Germany started the earliest and has the most mature technology.


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