Hot stamping materials and their selection (4)

4 After the test is correct, the rules of the upper and lower plates (on the upper platen and the lower plate) shall be checked and fixed again (to avoid movement), and the hot stamping work can be performed normally. Always check the hot stamping results, find problems and deal with them in time to ensure the quality of hot stamping.

5 When stamping the three-dimensional graphics of the soft plastic cover, in order to highlight the three-dimensional impression, two hot presses are required for hot stamping: the first time the first time; the second time on the blot and then hot pressure, the same position as the first time There must be no deviation in the slightest way. In this way, stereoscopic images can be burned out.

6 When hot-printing suede is especially velvet-faced, there is a pile of fluff on the surface of the velvet. One hot-pressing is unsuccessful. Therefore, two hot stampings are required. During the first hot stamping process, the co-adhesive powder is spread on the hot-stamped surface (without the hot-stamping material), and the hot-pressed method allows the adhesive powder on the imprinting layer to overwhelm the standing fluff; the second time the second time The hot stamping is on the overwhelming blot, and the second stamping must not have the slightest deviation, otherwise it will cause waste of waste material. With this kind of hot stamping method, the imprinting is firm and firm, and the unheated fluff is erected around the imprint, which is very three-dimensional and artistic.

7 hot stamping version is concave, and the hot pattern is high convex, such as the head of great people, etc., to the next version of the pad to highlight the main effect of the print.

2. Color foil stamping material. Color foil, also called powder foil, is a kind of hot stamping material made by coating pigments, resin adhesives and other solvents on the film base. Hot foil stamping can be used to create a variety of color graphics.

The variety of colors of the color foil is wide, and the range of selection is wide. It can be used for automatic continuous hot stamping processing. It is less wasteful and easy to transport and store. The foil package is the same as the electro-aluminum foil and is a very popular pigment foil. However, because the color layer of the color foil is thinner, compared with the color film, the color of the color film is not as bright, thick and full.

(1) The structure of the colored foil. The structure of the colored foil is similar to that of anodized aluminum. The difference is that the aluminum foil is vacuum-deposited with a layer of metallic aluminum, while the colored foil is coated directly on the base film without aluminum plating. There are two kinds of color foils, three layers and four layers.

The second layer: The first layer is a base film layer. The second layer is a paint layer. Three layers: The first layer is the base film layer. The second layer is a release layer. The third layer is a color layer.

The four-layer color foil is the same as the first layer, the second layer, and the third layer. The third layer is the color material layer, and the fourth layer is the adhesive layer.

(2) The performance of foil and hot stamping. There are many types of colored foils, and because of the different manufacturing processes, batches, etc., it is necessary to have good performance and use in use. Color foil is a kind of hot stamping film, classified by base film, with polyester film and paper film; it is classified by coloring material of adhesive layer, and there are water-soluble foil and alcohol-soluble foil. Some foils are suitable for embossing large-area patterns, some are suitable for small area graphics, and foils with patterned patterns. Therefore, you must choose according to your needs.

1 color foil performance. The properties of the colored foil are determined by the nature of the polymer selected. In the hot stamping process, it must have good detachability, adhesion, and can accurately display a variety of colors.

2-color foil stamping. Color foil stamping is more difficult than electro-aluminum foil, especially if it is processed with a large difference in surface color of the surface to be heated. If the material is improperly selected or poorly grasped, there will be problems such as blooming, missing bottom, discoloration, and paste quality. problem.

a. According to the texture, form and specific conditions of the material to be heated, the appropriate color foil is selected, and the width of the foil is rewound and recut according to the width of the imprint.

b. Check the quality of the colored foil before use. The inspection method is the same as that for the galvanized aluminum foil. Special attention should be paid to checking the trachoma, evenness and flatness of the colored foil.

c. Hot Stamping Smooth or patterned enclosures, stamping pressure and temperature are different. Embossed surface of the material with patterns, hot stamping pressure is greater, the temperature is also higher (usually 5-10 °C higher), if the processing conditions used are the same as the smooth surface, there will be hot after the end of the leak, not full , flowers and other quality issues. Hot foil stamping conditions, visit Table 2-6.

d. Thin line or large area of ​​hot stamping, not suitable for hot stamping on the bumpy pattern material, because the uneven pattern, will make thin lines hot line breaks, will also make a large area of ​​hot trace leakage bottom, hair Flowers or hot stamping is not a problem.

The object to be heated must be determined according to the design pattern and the condition of the hot stamping material. Generally, the hot stamping thin lines and graphics are applied with smooth or inconspicuous material. This choice, plus the convenience, can guarantee the hot stamping effect.

e. In the process of hot stamping, the finished product after hot may sometimes be in good or bad condition. In this case, you can check the temperature, time, pressure, whether there are problems, and then check the color foil roll for quality problems, found in time after cutting or switching, but it is strictly prohibited to throw indiscriminately throwing waste. Even if you change the color foil, you have to do analysis and record the reasons to accumulate experience.

f. After the hot foil, it should be full and bright with no splash at the bottom, and the paste is discolored. The writing is clear and firm and does not fall off.

3. Color hot stamping material. The color film is a kind of hot stamping material that is coated on paper and other flat and smooth objects by depositing a layer of mixed paint such as a pigment and a binding material, and drying and peeling off the paper.

The production of color chips has a history of nearly 60 years and is manual operation. The color film is dedicated to hot stamping bookcases. In the absence of color foils, glue is used to stamp various colored prints with this material. The feature of the color film is that it is simple and easy to process, the color is bright, and the hot and thick traces are pure and pure. However, the color film has no support body and it is easy to be broken and difficult to preserve. The use of color tablets for hot stamping has good results. Some high-end books with multi-color designs use hot stamps for hot stamping. The main reason is that the colors reflect the truth, and they are not easy to reflect and easy to read after encountering light.

(1) Production of color chips. The production of color chips is done manually and is divided into three steps.

1 Select the paint deposition plate. To make a color chip, you must first select and prepare a flat, smooth surface plate (usually 400mm x 200mm or 600mm x 300mm) of glass, and check whether there are blisters, etc., then wash it with clean water, dry it, and wait. . The surface of the coated plate must not contain dust, fiber wool, and other contaminants.

2 mix color paste. The main raw materials for the color pastes of color chips are: Colors—including various kinds of required light colorants and matte color materials; the main function is to present colors; adhesive—resin, shellac, or rosin Etc., the main role is to bond the color and the weak connection with the material to be heated; filler - titanium dioxide (appropriate use); solvent - industrial alcohol wax (can be used), the main role is to make the color film easy to dry Plates are peeled off.

Prepare a variety of adhesive material, and prepare it for uniform use. Dilution of color paste should be appropriate, not too thick, excessive waste of raw materials, increase costs, and difficult to process; not too thin, thinning will make the color layer thin, not reflect the hue of the color itself. The proportion of pigments and adhesives should be appropriate. Adhesive materials are too easy to change color, easy to peel, too few color chips after drying are easy to break, and not hot stamping. The degree of dilute thickness should be such that it can not only be firmly stamped, but also not easily peeled off and not broken.

3 deposition coating color paste. After the plates, color pastes, and the like have been prepared, deposition of the color chips can be performed. Before coating, a layer of wax can be applied on the plate to make it easier to separate (it can also be separated without applying wax liquid, but the effect is not as good as wax coating). Coating is generally performed by hand. The method is:

a. The cleaned plate (waxed or unwaxed) is placed on a flat table, and the adjusted color paste is evenly poured or coated on the plate for uniform deposition and coating.

b. The deposited color paste is compatible with the area of ​​the plate and the thickness of the coating, and the general thickness is approximately 0.3 mm.

c. After the coating is deposited, lay it flat and dry. After it is completely dry, peel it off and place it on the previously prepared paper. Place a layer of paper on each color sheet (the size of the pad is the same as the color film), complete the color film. Production processing.