Engraving printing, embossing, and hot-melt printing are three techniques for obtaining embossed images on paper. It is important to understand the differences among the three, the design techniques of each method, and the process of each method. These technologies are often used to print text, business cards, and important documents at the top of letterhead. Experts who are versed in mastering this knowledge can provide appropriate advice to customers. Based on experience, customers often only like the "surface" of a particular technology and do not understand the cost and time constraints of the product. At this time, you can recommend one of the most effective printing methods to your customers and provide a choice. This not only meets the company's requirements, but also satisfies the customer's needs.
Engraving printing Engraving printing combines the ink and paper by pressure to produce a clear and long-lasting image. High-quality engraving ensures the highest fidelity and clarity in the transfer of linework and images (from fine lines to small fonts) within the plate to the paper.
The process of engraving printing is to etch the designed concave image on the plate first, and then transfer the image to the surface of the substrate (usually paper). Photolithography is often used to make etching plates (ie impressions) because this technique can produce clean and clear images on the plate to be engraved.
First, a photosensitive layer is coated on the surface of the printing plate, exposed, and etched using an acid bath. Fine lines are formed by hand after etching, or excess plate material is removed in the recessed image area. The process of actually transferring an image onto paper should be called gravure printing by engraving the plate and applying pressure to a bottom mold (also called an imprint).
The bottom mold is a slightly raised copy of the stamp placed on top of the paper and the stamp to act as an imprint. It presses the paper into the recessed part of the stamp filled with ink. When the ink is filled with the stamp, the paper and the bottom mold are in full contact, and the image is transferred to the surface of the paper.
As shown in Figure 1, the edge of the bottom die is flush with the edge of the die, confining the ink between the die and the paper. The bottom mold is usually shallower than the stamp and made of cardboard. It is the bottom mold that creates a slight depression in the back of the paper. The bottom mold can minimize edge scratches on the image surface of the paper surface.
Embossed printing bump printing can also form a unique raised image on the surface of the paper. The resulting raised image is produced by two etched plates (unlike only one piece used in engraving printing). The main difference between engraving and embossing is that the two "coupled" stamps used in the embossing are used to form raised images, and the stamps do not contain ink.
Bump prints come in many forms. The stamp can be applied to the inked surface of the printing press, and the graphic with the ink is registered with the graphic image obtained by stamping. These stamps can also be used on the surface of metal foils in printing presses to print raised metal foils, or to print colored raised images on the surface of colored foils. They can even use the press alone to print "braille" bulges.
Embossing requires two stamps to form a pair of impressions: one is a recessed image pattern (as in engraving) and the other is a convex image pattern. The convex stamp, which is completely opposite to the concave stamp, is used as an imprint plate (secondary mold). All embossing processes use these two "mate" stamps to transfer the image to the paper. These two stamps are called "mates" because they must be perfectly matched to ensure that when the paper is placed When heated and pressurized between the two, the upper image can be raised. Likewise, the bottom image will be embedded in zigzag.
The production of impressions must be done carefully and carefully monitored on the press to prevent the two impressions from cutting the paper. Where there are deep impressions, the edge of the impression is inclined or rounded to avoid cutting the paper, and the pressure must be accurately controlled during printing. Can create bulges with multiple depths. If a series of chemical etching methods are used successively, each layer is etched deeper than the previous layer, so that a layered effect is obtained.
Do not confuse foil embossing with foil stamping. Although both techniques require metal foil and heat to transfer the image onto the paper, foil stamping does not belong to embossing. The bronzing foil image is obtained by flatly affixing the image to the film base through the etched stamp of the protrusion, instead of the "mate" impression. In the bronzing process, the metal foil does not directly bond with the paper to produce a clear raised image. The foil embossing technique produces raised images through two matching impressions, heating, and metal foils, which are not flat. Foil embossing requires that the foil roller be pressed against the surface of the paper while the surface of the foil roller in the foil is in contact with the stamp. Metal foils come in many colors. Color bump printed with a pale foil, can be seen in both rough and glossy surface printing.
Hot melt printing hot melt printing also produces a unique, raised appearance, but it is completely different from engraving and embossing. Hot-melt printed images are produced by applying ink on the press (as with embossing) and are not imaged by pressure and etched plates. Hot melt imaged sheet-fed printing uses rubber or oil-based slow-drying inks. Spray a layer of resin powder on the surface of the wet ink. As the process shows:
Slow-drying inks—spraying resin powders—vacuum—heating and drying powders can be fine, medium, or coarse (high-grade inks require fine powder for best results). Resin stuck to the ink remains on the paper, and excess resin is sucked away by the vacuum cleaner. The paper is then heated to melt the resin and fuse the ink and resin together. The image with the glass texture expands after heating, forms a raised image, and cools and solidifies.
The height or extent of the image is determined by the amount of resin that sticks to the ink surface. Larger images usually absorb more resin. Therefore, different effects can be created by controlling the ink, the amount of resin, and the heating temperature. If the surface of the inked paper is evenly sprinkled with resin, the time for heating the product is long enough, the resulting image will be firm and horizontal, and the product will always maintain a stable color value. However, hot melt printing technology can also be used to create a variety of complex effects. Different inks and resins can be printed glossy, semi-glossy, dull, half-gray, rough, metallic, pearlescent, high-rise, low-rise images. Braille can also be hot-melt printed using bright, colorless inks and resins.
Paper used These three techniques are best suited for use with non-coated paper, tissue paper, and textured paper. Their high fiber content guarantees better and lasting images. In engraving and embossing, the pressure of the printing press can cause the coated paper and coated paper to crack. For these three printing methods, the use of heavy-weight book paper is recommended. (In engraved and embossed printing, these papers are not easily broken, and it is not easy to see the damage caused by the imprinted plates. In the hot melt printing, these heavier papers can better support the weight of the resin).
After paper processing (refers to the process of folding and cutting the paper cover), the envelope is best suited to these three printing methods. The processing of paper products before printing solves the problem that it is difficult to register due to the fact that the shape of the paper is not fixed and the folding manner is different.
Paper with a weight between 20 and 24 pounds is best used to print the text above the letterhead in these three ways. In most cases, paper weighing less than 13 pounds is difficult to control because it runs slowly on the printer.
Design Factors All three technologies can print strong colors because the color matching system can be used, so the choice of colors is completely limitless.
Embossed prints, embossed prints, and hot melt prints used with laser printers require special attention. Laser-compatible (thermally resistant) hot-melt printing resins and engraving inks are required. Metal foils and light-colored reliefs are also particularly sensitive to the heat of laser printers. Take care to ensure that printer pressure does not flatten or deform the relief image.
In engraving and hot melt printing, do not determine the ink before seeing the appropriate sample and final proofs. Because during the engraving process, the ink looks different before drying and after drying; in hot melt printing, the final effect cannot be seen until the resin is completely dry.
When embossing on paper substrates of specific colors (primarily brown, yellow, and orange), heat and pressure tend to cause the paper to fade.
Metallic foil embossments can be printed on medium and deep coloured surfaces (and some rougher foils can achieve the desired display effect). The Braille relief can be effectively printed on any color paper that meets the weight requirements
Engraving printing Engraving printing combines the ink and paper by pressure to produce a clear and long-lasting image. High-quality engraving ensures the highest fidelity and clarity in the transfer of linework and images (from fine lines to small fonts) within the plate to the paper.
The process of engraving printing is to etch the designed concave image on the plate first, and then transfer the image to the surface of the substrate (usually paper). Photolithography is often used to make etching plates (ie impressions) because this technique can produce clean and clear images on the plate to be engraved.
First, a photosensitive layer is coated on the surface of the printing plate, exposed, and etched using an acid bath. Fine lines are formed by hand after etching, or excess plate material is removed in the recessed image area. The process of actually transferring an image onto paper should be called gravure printing by engraving the plate and applying pressure to a bottom mold (also called an imprint).
The bottom mold is a slightly raised copy of the stamp placed on top of the paper and the stamp to act as an imprint. It presses the paper into the recessed part of the stamp filled with ink. When the ink is filled with the stamp, the paper and the bottom mold are in full contact, and the image is transferred to the surface of the paper.
As shown in Figure 1, the edge of the bottom die is flush with the edge of the die, confining the ink between the die and the paper. The bottom mold is usually shallower than the stamp and made of cardboard. It is the bottom mold that creates a slight depression in the back of the paper. The bottom mold can minimize edge scratches on the image surface of the paper surface.
Embossed printing bump printing can also form a unique raised image on the surface of the paper. The resulting raised image is produced by two etched plates (unlike only one piece used in engraving printing). The main difference between engraving and embossing is that the two "coupled" stamps used in the embossing are used to form raised images, and the stamps do not contain ink.
Bump prints come in many forms. The stamp can be applied to the inked surface of the printing press, and the graphic with the ink is registered with the graphic image obtained by stamping. These stamps can also be used on the surface of metal foils in printing presses to print raised metal foils, or to print colored raised images on the surface of colored foils. They can even use the press alone to print "braille" bulges.
Embossing requires two stamps to form a pair of impressions: one is a recessed image pattern (as in engraving) and the other is a convex image pattern. The convex stamp, which is completely opposite to the concave stamp, is used as an imprint plate (secondary mold). All embossing processes use these two "mate" stamps to transfer the image to the paper. These two stamps are called "mates" because they must be perfectly matched to ensure that when the paper is placed When heated and pressurized between the two, the upper image can be raised. Likewise, the bottom image will be embedded in zigzag.
The production of impressions must be done carefully and carefully monitored on the press to prevent the two impressions from cutting the paper. Where there are deep impressions, the edge of the impression is inclined or rounded to avoid cutting the paper, and the pressure must be accurately controlled during printing. Can create bulges with multiple depths. If a series of chemical etching methods are used successively, each layer is etched deeper than the previous layer, so that a layered effect is obtained.
Do not confuse foil embossing with foil stamping. Although both techniques require metal foil and heat to transfer the image onto the paper, foil stamping does not belong to embossing. The bronzing foil image is obtained by flatly affixing the image to the film base through the etched stamp of the protrusion, instead of the "mate" impression. In the bronzing process, the metal foil does not directly bond with the paper to produce a clear raised image. The foil embossing technique produces raised images through two matching impressions, heating, and metal foils, which are not flat. Foil embossing requires that the foil roller be pressed against the surface of the paper while the surface of the foil roller in the foil is in contact with the stamp. Metal foils come in many colors. Color bump printed with a pale foil, can be seen in both rough and glossy surface printing.
Hot melt printing hot melt printing also produces a unique, raised appearance, but it is completely different from engraving and embossing. Hot-melt printed images are produced by applying ink on the press (as with embossing) and are not imaged by pressure and etched plates. Hot melt imaged sheet-fed printing uses rubber or oil-based slow-drying inks. Spray a layer of resin powder on the surface of the wet ink. As the process shows:
Slow-drying inks—spraying resin powders—vacuum—heating and drying powders can be fine, medium, or coarse (high-grade inks require fine powder for best results). Resin stuck to the ink remains on the paper, and excess resin is sucked away by the vacuum cleaner. The paper is then heated to melt the resin and fuse the ink and resin together. The image with the glass texture expands after heating, forms a raised image, and cools and solidifies.
The height or extent of the image is determined by the amount of resin that sticks to the ink surface. Larger images usually absorb more resin. Therefore, different effects can be created by controlling the ink, the amount of resin, and the heating temperature. If the surface of the inked paper is evenly sprinkled with resin, the time for heating the product is long enough, the resulting image will be firm and horizontal, and the product will always maintain a stable color value. However, hot melt printing technology can also be used to create a variety of complex effects. Different inks and resins can be printed glossy, semi-glossy, dull, half-gray, rough, metallic, pearlescent, high-rise, low-rise images. Braille can also be hot-melt printed using bright, colorless inks and resins.
Paper used These three techniques are best suited for use with non-coated paper, tissue paper, and textured paper. Their high fiber content guarantees better and lasting images. In engraving and embossing, the pressure of the printing press can cause the coated paper and coated paper to crack. For these three printing methods, the use of heavy-weight book paper is recommended. (In engraved and embossed printing, these papers are not easily broken, and it is not easy to see the damage caused by the imprinted plates. In the hot melt printing, these heavier papers can better support the weight of the resin).
After paper processing (refers to the process of folding and cutting the paper cover), the envelope is best suited to these three printing methods. The processing of paper products before printing solves the problem that it is difficult to register due to the fact that the shape of the paper is not fixed and the folding manner is different.
Paper with a weight between 20 and 24 pounds is best used to print the text above the letterhead in these three ways. In most cases, paper weighing less than 13 pounds is difficult to control because it runs slowly on the printer.
Design Factors All three technologies can print strong colors because the color matching system can be used, so the choice of colors is completely limitless.
Embossed prints, embossed prints, and hot melt prints used with laser printers require special attention. Laser-compatible (thermally resistant) hot-melt printing resins and engraving inks are required. Metal foils and light-colored reliefs are also particularly sensitive to the heat of laser printers. Take care to ensure that printer pressure does not flatten or deform the relief image.
In engraving and hot melt printing, do not determine the ink before seeing the appropriate sample and final proofs. Because during the engraving process, the ink looks different before drying and after drying; in hot melt printing, the final effect cannot be seen until the resin is completely dry.
When embossing on paper substrates of specific colors (primarily brown, yellow, and orange), heat and pressure tend to cause the paper to fade.
Metallic foil embossments can be printed on medium and deep coloured surfaces (and some rougher foils can achieve the desired display effect). The Braille relief can be effectively printed on any color paper that meets the weight requirements
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