21 kinds of surface treatment processes

Microarc oxidation

Micro-arc oxidation, also known as micro-plasma oxidation, is to grow ceramic film mainly composed of matrix metal oxide on the surface of aluminum, magnesium, titanium and their alloys by the combination of electrolyte and corresponding electrical parameters under the instantaneous high temperature and high pressure generated by arc discharge.

Metal wire-drawing

Metal wire drawing is a kind of surface treatment means to form lines on the surface of workpiece by grinding products and play a decorative role.


Blue-burning means that the whole carcass is filled with colored glaze, and then it is baked in a blast furnace with a furnace temperature of about 800℃. The colored glaze is melted from a sandy solid into a liquid, and after cooling, it becomes a gorgeous colored glaze fixed on the carcass. At this time, the colored glaze is lower than the height of copper wire, so it is necessary to fill the colored glaze again, and then sinter it, generally four or five times in a row, until the pattern is filled to be even with the thread.

Shot blasting

Shot peening is a cold working process that uses shot to bombard the surface of the workpiece and implant residual compressive stress to improve the fatigue strength of the workpiece.

Sand blast

Sandblasting is a process of cleaning and roughening the surface of the substrate by the impact of high-speed sand flow, that is, compressed air is used as the power to form a high-speed jet beam to spray sprayed materials (copper ore, quartz sand, emery, iron sand and Hainan sand) to the surface of the workpiece to be treated at high speed, so that the appearance or shape of the outer surface of the workpiece surface changes.


Etching is a technology to remove materials by chemical reaction or physical impact. Etching is also called photochemical etching, which refers to removing the protective film from the area to be etched after exposure and development, and contacting with chemical solution during etching to achieve the effect of dissolving corrosion, forming concave-convex or hollow molding.


IMD (In-Mold Decoration technology), also known as paint-free technology, is an internationally popular surface decoration technology. The surface is hardened with transparent film, the middle printed pattern layer, the back injection layer and the middle of ink, which can make the product wear-resistant, prevent the surface from being scratched, and keep the color bright and not easy to fade for a long time.


OMD Out Mold Decoration, abbreviated as OMD, is a decoration technology that integrates vision, touch and function, and is extended by IMD. It is a 3D surface decoration technology that combines the characteristics of printing, texture and metallization.

Laser carving

Laser engraving, also called laser engraving or laser marking, is a surface treatment process based on optical principles. The laser beam is used to carve a permanent mark on the surface of a material or inside a transparent material.


Electrical discharge machining (EDM) is a special machining method to remove conductive materials by using the electric erosion produced by pulse discharge between two electrodes immersed in working fluid, also known as discharge machining or electric erosion machining, or EDM for short. Tool electrodes are commonly made of corrosion-resistant materials with good conductivity, high melting point and easy processing, such as copper, graphite, copper-tungsten alloy and molybdenum. In the process of machining, the tool electrode also has loss, but it is less than the erosion amount of workpiece metal, and even close to no loss.

Laser flower biting

Laser flower biting uses high energy density laser to react with steel surface to form snakeskin/etching/pear land or other patterns.

Transfer printing

Pad printing is one of the special printing methods, that is, using steel (or copper, thermoplastic plastic) intaglio, using a curved pad printing head made of silicone rubber material, dipping the ink on the intaglio onto the surface of the pad printing head, and then pressing the surface of the required object to print words, patterns and so on.

Silk-screen printing

Screen printing is to stretch silk fabric, synthetic fiber fabric or metal screen on a screen frame, and make a screen printing plate by hand engraving paint film or photochemical plate making. Modern screen printing technology is to use photosensitive materials to make screen printing plates by photographic plate-making (making the screen holes in the graphic part of the screen printing plate be through holes, but not the screen holes in the graphic part are blocked). When printing, the ink is transferred to the substrate through the mesh of the graphic part through the extrusion of the scraper, forming the same graphic as the original.

Direct thermal printing

Direct thermal printing refers to a method of coating a thermal agent on paper to make it a thermal recording paper. Under the action of heat, the thermal recording paper changes the physical or chemical properties of the substance (developer) to obtain an image.

Thermal transfer

The principle of thermal transfer printing is that digital patterns are printed on special transfer paper with special transfer ink through a printer, and then the patterns are accurately transferred to the surface of goods with a special transfer machine at high temperature and high pressure to complete the printing of goods.

Offset printing

In lithography, the graphic part and the non-graphic part are on the same plane. In order to distinguish the graphic part or the non-graphic part of the printing plate with ink, the non-graphic part of the printing plate is first supplied with water by the water supply device of the printing plate parts based on the principle of oil-water separation, thus protecting the non-graphic part of the printing plate from being wetted by ink. Then, ink is supplied to the printing plate by the ink supply device of the printing part. Because the non-graphic part of the printing plate is protected by water, ink can only be supplied to the graphic part of the printing plate. Finally, the ink on the printing plate is transferred to the milk skin, and then the ink on the milk skin is transferred to the substrate by using the pressure between the rubber roller and the impression cylinder, thus completing one printing. Therefore, lithography is an indirect printing method.

Curved surface printing

Curved surface printing is to put the ink into an intaglio engraved with characters or patterns, then copy the characters or patterns onto the curved surface, then transfer the characters or patterns to the surface of the molded product by using the curved surface, and finally cure the ink by heat treatment or ultraviolet light irradiation.


Hot stamping, commonly known as “hot stamping”, refers to the hot stamping of characters and patterns made of materials such as colored foil on the first or fourth seal and the back of a hardcover book, or the stamping of various convex and concave titles or patterns by hot pressing.

Water transfer printing

Water transfer printing is a kind of printing that uses water pressure to hydrolyze transfer paper/plastic film with color patterns. The technological process includes the production of water transfer printing decal, immersion of decal, pattern transfer, drying and finished product.

Flat screen printing

Flat screen printing, the printing die is a polyester or nylon screen (pattern) fixed on a square frame and with hollow patterns. Color paste can penetrate through the pattern on the pattern plate, and the mesh is closed with polymer film layer at the place without pattern. When printing, the flower plate is pressed against the fabric, and the color paste is filled on the flower plate, which is scraped and pressed back and forth with a scraper to make the color paste reach the surface of the fabric through the pattern.


Calendering is also called calendering. The last process of heavy leather finishing. Using the plasticity of fiber under mixed heat condition, the fabric surface is flattened or rolled into parallel fine diagonal lines to improve the finishing process of fabric luster. After the material is fed, it is heated and melted, then formed into a sheet or film, and then cooled and rolled up. The most commonly use calendering material is polyvinyl chloride.


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