Hot Stamping Technology--Influencing Factors

The main factors that affect hot stamping

The main factors affecting the quality of hot stamping are temperature, pressure and hot stamping time, as well as the level of cooperation among the three. In addition, stampability, speed, substrate, stamping machine, hot stamp quality, plate loading and hot plate technology, anodized aluminum tensioning, fixtures and pads, environmental conditions, indoor, substrate temperature, indoor The degree of air cleanliness (dust content), humidity, etc. are also important factors that affect hot stamping. The adjustment of major factors should pay attention to the following issues.

(1) Hot stamping temperature. If the hot stamping temperature is too high, the hot stamping imprint will lose its metallic luster, blistering, unclear edges or even stencil; while the hot stamping temperature is too low, hot stamping will not appear firmly or the writing hair will not be able to be stamped. Various types of aluminum foil are suitable for different stamping temperatures. No. 1 is 80-95 degrees Celsius, No. 8 is 75-90 degrees Celsius, No. 12 is 75-90 degrees Celsius, No. 15 is 60-75 degrees Celsius, and pure gold foil is 80-130 degrees Celsius. The color foil, gold foil foil, and silver foil foil are 70 to 120 degrees Celsius, so according to the actual situation, pay attention to debugging.

(2) Stamping pressure. Excessive hot stamping pressure will result in thicker paste or imprinting. When the hot stamping pressure is too low, the hot stamping foil cannot adhere to the substrate, and the hot stamping area cannot be cut. In addition, the installation of hot stamping foil can not be too tight or too loose, when the writing is too short, the writing will be broken; if it is too loose, the trace will be unclear and the paste will be dirty.

(3) Hot stamping speed: The hot stamping speed actually reflects the contact time between the substrate and the hot stamping foil during the hot stamping process of the hot stamping and directly affects the fastness of the hot stamping. Hot stamping speed is too fast, it will lead to hot stamping or imprinting; Hot stamping speed will not only affect the quality of hot stamping, but also affect the production efficiency. Different types of aluminum foil suitable for different hot stamping speed, according to practice, the No. 1 anodized aluminum suitable for fast hot stamping, about 40 sheets / minute or so, 8th, 12th anodized aluminum suitable hot stamping speed is 18-30 sheets / Minutes, 15th is 18-22 shots/minute. In addition, the speed, pressure, temperature and other factors in the hot stamping process are mutually restricted, and its work: art parameters are always determined in the order of stamping speed, pressure, and temperature. Under normal circumstances, the hot stamping speed should be determined first, and treated as a constant, not to be easily changed; then the corresponding stamping pressure and hot stamping temperature can be found out, which can simplify the operation procedure and also can easily control the quality of the stamping. .

(4) Hot stamping materials. Various hot stamping substrates are available. Printed materials include offset paper, coated paper, whiteboard paper (cardboard), textured paper, lacquer cloth, plastics, etc. Hot stamping process and precautions for different substrates vary. For example, the hot stamping of coated paper products, such as hot at various temperatures are not up, or there is a lack of pen strokes, edge hair and other phenomena, generally can be hot stamping on the reverse side of the coated paper, the effect is ideal. Sometimes the ground color is found, the ink layer is not thick, and the surface of the ink film is slightly glossy, which is caused by the addition of a detackifier containing wax substances in the ink in order to overcome certain process troubles when printing the actual version. , The method of processing, for the field version containing wax materials, a small number of hot stamping using five layers of gauze bag rosin powder wipe in the hot stamping parts, a large number of to dilute ink plus 3% adhesive and 3% white dry oil cover Once printed, after this treatment, the hot stamping results are better; for reverse pulling, corresponding measures are taken according to different situations. The reason for the back-drawing is that the printed ink layer is not dry, and the printed product should be placed in a ventilated dry place where the ink layer is dried; second, the white ink is used to dilute the light-colored ink layer. Agents, due to the coarse white pigment particles and poor bonding between the binders, the surface of the stamping surface can be powdered. You can use bright light diluting agent and dry oil to cover the surface first, and then perform hot stamping; The aluminum foil is hot stamped. For printing with bright colors, good gloss, moisture-proof, wear-resisting, etc., gold-card paper is welcomed by customers. Because gold-card paper printing is difficult, it is easy to get dirty, and ink is touched off. difficult. However, as long as you pay attention to the following issues, you can also stamp out exquisite products. First of all, gold cardboard is formed by bonding aluminum foil and paper. From the cross section, it is a surface coating, an aluminum foil layer, an adhesive layer, and a paper substrate. The surface coating is equivalent to preprinted with a layer of metallic color, which is relatively smooth and poor in permeability. The ink is not easy to adhere to, and even if it is printed, it is difficult to dry. Therefore, the best choice for synthetic paper special ink, ink volume should be small, as thin as possible, not too much dusting, imprinted completely dry before hot stamping. If hot stamping does not die, a thin layer of background color may be printed on the hot stamping area before printing so that the hot stamping foil adheres to the ink. When hot stamping, choose the right stamping temperature, pressure and speed, hot stamping version to use copper plate, because of its good heat transfer performance, pressure wear resistance, not easy to deformation, the height difference between graphic and blank parts should be as possible to pull Large, so that it does not contiguous or paste version.