• Waterborne gravure printing ink features
    Waterborne gravure printing ink features

    2022-07-22

    The difference between water-based gravure printing ink and other printing methods mainly lies in: its printing plate through corrosion or engraving, the formation of a lot of plate surface of different volumes of concave hole, known as the ink hole.The ink hole volume is large, the amount of ink filling in the printing process is large, and the ink layer thickness is transferred to the substrate. The ink hole volume is small, the amount of ink filled in is small, and the ink layer transferred to the substrate is thin, so the orderly and bright and bright picture and text formed on the substrate.In gravure printing, the smooth surface of the non-graphic part that is in contact with the substrate is pressed, and the ink is basically not pressed. The biggest characteristic of gravure printing is that the ink film of the printing product is nearly twice as thick as that of letterpress printing, so the ink layer is full and three-dimensional, but it is prone to sticky failure. Water-based gravure printing ink is characterized by: part of the plate cylinder impregnated rotation in the ink tank, making the entire plate surface is covered with ink, when all the plate with the scraping blade after inking scrape off the plate blank part of the ink, at the same time fully will ink into plate in the recess, and the plate by stamping device within the recesses of ink stamping on the surface of substrates, to complete the transfer of ink to the substrates.Some gravure rotary presses are also installed with a heating and drying device to speed up the drying and curing speed of ink on substrate materials (especially non-absorbent materials). The advantage of water-based gravure printing ink is very outstanding, the printing quality of stereoscopic effect A clear hierarchy Bright color is full Accurate color reproduction, and printing process is relatively simple, lower rejection rate, plate printing endurance than lithographic printing plate printing endurance high, in the field of flexible packaging printing, particularly for food packaging), gravure printing by the people of all ages. Water-based gravure printing inks mostly belong to volatile drying ink, the binder is composed of resin and a large number of volatile solvents, viscosity is very low, the pigment and filler additives and the binder mixture and grinding dispersion into ink.Ink is printed to the substrate, through the solvent quickly volatilized and dry conjunctiva in a gravure printing machine with heating device, the solvent in the ink to accelerate volatilization, drying faster, so can be non-absorbent materials (plastic film, metal foil, etc.) printing.

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  • How to solve the problem that pressure irregularity affects printing quality when printing self-adhesive labels
    How to solve the problem that pressure irregularity affects printing quality when printing self-adhesive labels

    2022-07-22

    How to solve the problem that pressure irregularity affects printing quality when printing self-adhesive labels Printing pressure has a great influence on printing quality.Maintaining an average and constant printing pressure in the effective printing area can not only make the printing ink uniform, small color difference, but also keep the size of the printing mark.It is feasible to achieve maximum flat flat printing printing pressure But because it is the manufacturing precision of printing plate flatness problem, and the adhesive is unlikely to be completely average thickness of base material, cause uneven pressure, affect the printing quality of the solution not average measures is a liner, where the pressure is small, the workbench bottom cushion; One is to reduce the hardness of flexible version.But reduce the hardness of flexible version is limited, if the soft hard through low, will make the geometric size of the text outward expansion, so that small font easily trance.When printing in large area, the problem of printing pressure is not easy to solve. For this, we borrow the method used in bronzing, that is, a layer of drying on the workbench to make 175 line reticular hardness of 90 silicone rubber version, which can solve the problem of exhaust and local pressure shortage. Sinograce chemical company produces various types of water-based ink raw materials with high quality and good price.

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  • The difference between coupling agent and surfactant
    The difference between coupling agent and surfactant

    2022-08-08

    In the process of coating manufacturing, it is necessary to belong to the hydrophilic polar material Yan, fillers dispersed to belong to the hydrophobic non-polar material organic base material.In order to increase the affinity between inorganic matter and organic polymer, it is generally necessary to use coupling agent or other surfactants to treat the surface of inorganic matter, so that it changes from hydrophilic to hydrophobic, so as to promote the interface between inorganic matter and organic matter. Coupling agents and surfactants have some similarities in molecular structure and application properties, but there are also differences. Both are composed of hydrophilic and hydrophobic groups.Surfactant through the molecular hydrophilic group oriented adsorption on the surface of inorganic color, packing monolayer, which is a physical adsorption phenomenon, so as to improve the dispersion and wettability of the color and packing in the base material, so it is only physical adsorption, so the surfactant migration phenomenon affects the luster, appearance and adhesion. Coupling agent is through chemical reaction and the surface of inorganic fillers accidentally coupling consolidation and crosslinked polymer binders, combine two kinds of different material, plays a role of bridge, from the bonding strength, raise yan, filler dispersion process in the basic material and reduce the extent of interfacial energy, coupling agent is greatly better than surfactant.

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  • The role of pigments in wood coatings
    The role of pigments in wood coatings

    2022-07-14

    Pigment is a white or colored fine powder substance which is generally insoluble in water, oil and solvents (some pigments are soluble), but can be evenly dispersed in water.Pigment and film forming material solution mixed on the surface of the material, can form a covering ability of various colors of the paint layer in wood products coating or finishing process, pigment has three functions. It is as a result of making lubricious lacquer, if enamel mixes lacquer to wait. Second, in the wood finishing process for the deployment of pigment colorants, used for substrate surface coloring. The third is to use it as physical pigment, used to deploy putty for wood surface inlay and fill holes. Our company produces wood lacquer, welcome to consult

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