Hot Stamping Technology--Types of Hot Stamping Materials (4)

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 color 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 color 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 color 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, including 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 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 not properly selected or is not well-handed, 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 break, 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 fine 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.