Application of Transparent Ink in Printing and Troubleshooting 2

For example, the hue of some inks before compounding is close to the standard, but the hue after compounding may be very different. On the other hand, some hue after ink printing has a certain gap with the standard, but after compounding, the hue of the ink is closer to the standard. The hue of the transparent ink is very difficult to mix so it is very important to understand the customer's process. The drying speed of transparent ink is very slow. This is because the curing agent of transparent ink contains low f (because the color concentration of the dye is higher than that of the pigment, so the amount is not too much). The solvent contains high f, so it is necessary to control the drying condition, otherwise it is easy to cause Excessive residual solvent and odor. In severe cases, after compounding, the solvent will slowly penetrate into the surrounding area and spread to discolor other colors. Therefore, when printing such transparent ink, it is necessary to pay attention to the control of the solvent ratio and the printing speed, and then put it into a curing chamber at about 400° C. and mature it for more than 10 hours.

Transparent ink selection and application

The selection and application of transparent ink should be based on the requirements of different substrates and customer requirements. To sum up, the following three aspects should be taken into consideration and a transparent ink should be reasonably selected.

1, according to the printing materials used to adapt to the choice of ink: If the printing table printed aluminum film must be selected table printing transparent ink: printing BOPP film and composite aluminum plating should use printed transparent (composite) ink. Therefore, it can be said that the type of printing materials determines the type of ink used, even if it is the same type of film material, it often varies depending on the type and grade. Also note that printing with clear ink generally does not use a white bottom underneath the color case because the white will have a delustering effect that will greatly reduce its effectiveness and value. Relatively speaking, the transparent ink printing color is thinner by 0.01mm than the white ink pad bottom.

2, according to the sample provided by the customer choose to adapt to the transparent ink: the choice of transparent ink, including hue and color. For the deployment of spot color clear ink, you must consult the production supplier because the deployment of clear ink spot color is different from the general spot color ink, and the difficulty is obviously higher than that of the opaque ink tone.

3, according to the actual situation and the use of packaging to select the appropriate transparent ink: such as packaging prints high temperature resistance, light resistance, penetration resistance and other parameters, these must be included in the selection of considerations. In addition, transparent ink printing requires high brightness and vivid colors without aluminum film or aluminum foil, aluminum foil, etc. Since the transparency of the transparent ink is extremely high and the aluminized film is composited or directly printed on the above materials, it will change. In order to reveal the luster and color of the metal, yellow is more yellow, green is greener, and red is redder is better.

Today, transparent inks have developed a variety of transparent golden, transparent yellow, transparent light blue. The transparent golden compound is even more glittering when it is laminated on aluminized film: transparent golden Because transparency is extremely high, it is often used in self-aligning gold, and it can also be lined with gold powder. According to the customer's request, the golden ink which is prepared with the ratio of 1:3:2 of gold powder, gold transfer oil, and transparent golden ink for self-made golden ink can be selected not only for gold but also greatly enhances its adhesion. . At present, transparent ink is mainly used for printing colorful flowers, color bars, ribbons, and other gift gold paper. These wrapping papers are printed in transparent ink (red, yellow, green, blue, etc.) or printed with aluminum film, which is a single-stick film. After the transparent ink is printed, the inner layer is made of aluminized film to form a flexible packaging bag or a small inner bag made of aluminized film is made into a conjunctiva. This is a film that belongs to more than two layers and has been widely used in the food industry. There are also printed papers, carton boxes, New Year pictures and other high-end packaging printed products made of transparent ink and printed on aluminum after being re-applied to paper. The printed products have the advantages of waterproof and moisture-proof. The use of anti-counterfeit materials printed and then printed with transparent ink and then re-launched laser holographic film can not only increase the security effect, while making the appearance of colorful, shining. In order to achieve the best results, the transparent ink may not be fully used at the time of design, and only a partial transparent ink printing may be used to obtain better results. Transparent ink is a dry special ink, because of its different formulations, so the use of methods and general ink also have some differences.

Transparent ink must be fully stirred before printing If in the colder winter, the table printing transparent ink is not suitable to add too much thinner because of the low drilling degree, and the drilling degree is generally controlled at 18-22 seconds, preferably 3 cups, and then according to the depth of the printing plate. Adjust the blade angle and the pressure of the impression cylinder and the distance between the doctor blade and the embossing point.