Imitation metal etching screen printing process

Screen printing is favored in the printing and decorating field of printing plants, and its status and role are increasingly neglected for envelope printing. In particular, cigarettes, wine, and gift packaging are widely used by Shanghai printing plants. At present, the most widely used are screen printing processes such as imitation metal etching, ice flower texture, and refraction. The printed boxes are colorful, elegant, luxurious, and self-adhesive printing can be regarded as top grade. They are deeply loved by consumers and the market is promising. .

Imitation metal etching screen printing process

The so-called imitation metal etching screen printing is the printing company's use of screen printing methods to print imitation metal etching inks on substrates with metallic luster such as gold and silver cards, to obtain a similar smooth printing company metal corrosion, engraving or Unique visual effects such as scrubs.

1. Imitation metal etching screen printing advertising plate making

(1) The choice of wire mesh. Should use a large tension, uniform mesh, low expansion rate Shanghai printing screen, generally use plain weave thin polyester screen. Because the imitation metal etching ink of the printing factory has coarser particles with a diameter of about 15-30μm, the platemaking should use a 180-240 mesh/inch screen, and the width of the mesh can reach 60-90μm.

(2) The selection of printing frames and the stretch net. The frame should be selected aluminum alloy mesh frame with good strength, heat resistance, corrosion resistance, light weight, durability and no distortion. In order to ensure the digital printing quality of the stretch net, a stretcher or a pneumatic stretcher can be used to stretch the net. The tension of the stretch net should be controlled between 16 and 18 N/cm.

(3) Apply a photosensitive liquid. Sensitive adhesive screen printing can use diazo photosensitive adhesive, coating slot is mostly Stainless Steel, the photosensitive liquid is poured into the slot about 1/2, will be good screen printing version of the printing service tilted 70 °, coating slot and The bottom of the screen is in contact with the screen, and it is slowly raised upwards to coat the screen from bottom to top. Note that the speed should not be too fast, so as to avoid blistering of the photosensitive liquid and pinholes on the film surface. Afterwards, the business card printing will invert the screen version and coat it again, and then dry it in a drying oven at 40°C. After drying, the squeegee side of the screen shall be coated 2 to 3 times in the same way, and the film thickness may be 10 to 30 μm to print on the disc.

(4) Shaiban. The film surface of the positive image is printed and sealed on the surface of the screen-printed sensitized adhesive and placed in a vacuum printing machine for exposure. Exposure light source can use 3kW iodine lamp, exposure time can be textile printing according to the specific circumstances.

(5) Development. Expose the color-printed screen plate in water for 1 minute to allow the unexposed film to swell and then use a spray gun with a pressure of 3.5-5.5 kg/cm2 to spray water from both sides of the screen on the screen to develop the image. The mesh is completely transparent. Afterwards, drying and revision processing are also required.

2. Imitation metal etching Shanghai packaging design screen printing

(1) Printing materials. The surface of the printing material should be a metallic shiny surface, such as aluminum foil paperboard, electrochemical aluminum foil surface. In screen printing, the glossy film surface contrasts sharply with the rough surface of printed carbonless paper etched ink. Under the irradiation of sunlight, the contrast between the two is greater, and the metal etching effect of the imitation scratch card is stronger. The effect is a screen flower that cannot be reached by other substrates.

(2) Imitation metal etching ink. This ink is widely used in high-grade tobacco, wine, tea, cosmetics, gifts and envelopes printed pharmaceutical packaging. After printing this type of ink on surface-coated vacuum coated paper (commonly known as gold or silver cardboard), it will produce a similar effect to digitally-printed metal-etched sand surfaces, and is also called matte ink. The ink was originally designed for posters imported from Japan and South Korea. Now it has been fully domesticated, and its quality is comparable to that of imported products. It is the largest amount of ink used by the Shanghai advertising design company for cigarette packs and wine bags. one. The hanging flag design ink is a transparent viscous liquid, the appearance of grayish white, divided into three kinds of specifications of coarse sand, medium sand, fine sand, good printability sample design.

Now, special inks for screen printing on imitation metal etching discs are UV curable inks and consist of photopolymerization resins, photopolymerization initiators, pigments, auxiliaries, and polymerization inhibitor printing plants. When curing, the curing light source can use a metal halide lamp with a power intensity of 120W/cm, a focal distance of 10cm, and a curing speed of 10-15m/min (the light source and the magazine printing lamp have different distances from each other). Imitation metal etching ink is characterized by fast curing, easy sealing, easy to clean.

Ice screen printing glass printing is to print ice ink on gold and silver card paper. After UV curing, the surface of the printed product will show a crystal clear and dense “ice flower” pattern, shining under the illumination of light, like a winter glass window. Blossoming ice flowers. Ice silk screen printing flyer design can make cigarettes, wine, gifts and other packaging more novel and unique.

1. Screen making points

(1) Screens are generally 100-300 mesh/inch monofilament polyester screens from Shanghai Printing Factory. Among them, screen printing ice silk with 100 to 180 mesh/inch works best. The number of meshes is low, and the flower type of the ice flower effect is rough. When the number of meshes is high, the ice flower pattern is fine and Shanghai adhesive printing is meticulous.

(2) The screen tension is 16 to 20 N/cm, and the thickness of the film coated with the photoresist is generally 12 to 14 μm.

2. Requirements for printing materials

Screen Printing Ice Covered Paper The manual printing is to cover the surface of high-smooth cardboard with a layer of high-gloss vacuum aluminized film. The quality of the film is one of the key factors that determine the quality of ice screen printing. The surface gloss of the coating has a great influence on the product quality. The higher the surface gloss, the stronger the reflection, and the better the printing effect. The pattern is more flash and brighter. As the printing and packaging design of the printed product immediately after UV curing, this requires the film has a certain degree of light resistance, heat resistance, that is, in the entire curing process, the film can not be bubbled, and can not be separated from the underlying cardboard poster design.

3. Ice flower ink

Ice flower ink is a kind of special UV ink, its business card design printing patterns can be divided into large, medium and small three kinds. The large pattern is approximately 6 to 8 mm, the medium pattern is approximately 4 to 6 mm, and the small pattern is approximately 2 to 4 mm. If the three patterns of ice printing ink digital printing are mixed together, a brand new large flower flower surface finish can be created.

Ice flower ink is transparent, not only does not cover the carbonless paper bottom layer ink, but can also play a role in the design of the propaganda sheet for the color of the underlying ink, so that the printed pattern presents a colorful visual effect.

4. Ice screen printing

The hardness of the printing squeegee is in the range of HS65-75, and the squeegee and scratch card printing effect is better. In the printing, the ice printing ink adopts the discontinuous solidification method, and the advertising design of printing products is on the conveyor belt of the curing machine with a screen printing speed of 25 to 35 meters/minute. The curing light source is six UV lamps that are discharged in parallel and the power intensity is 60 to 80 W/cm for CD printing. When curing, after passing through the first three UV adhesive printing lamps, the printed product should be blown in the cooling zone, then enter the curing zone of the last three lamps, and then blown with cold air, so that the desktop calendar is more effective. Product Manual.