Application of color silk screen printing in packaging containers

The production requirements of the screen printing version of the screen are the same as those for the special printing, but when dealing with the small outlets, the fine printing dots must be dried on the printing screen. Whether it is to select a direct photosensitive coating layer or a capillary stencil layer, the stencil must meet two requirements: one should establish a sealing plate that can cover the mesh lines and level; the other is to minimize the deposition of ink in the mesh. Make the edges as thin as possible. If the template is too thick, the ink will be deposited in the mesh position during printing, and transfer to the substrate will result in dot gain and image smudging.
For screen printing, the use of a high-quality, high-curing direct emulsion is a requirement for half-tone printing, and it is also required to produce a capillary stencil film matching the number of screen lines.
Emulsion coating technology plays an important role in the finished product quality. If practiced many times, it will make the technology more perfect. If you want to measure and control the stencil thickness and surface roughness, you should use a triangometer and R2 meter. These instruments can measure stencil surface characteristics or roughness.
Exposure exposure is very important for halftone printing because over or under exposure affects the size of the dots, which in turn affects the quality and color of the printed image. The effective exposure is mainly related to the elimination. Therefore, in order to obtain a uniform light energy, it is better to use an optical integrator to compensate for the attenuation of the light energy and the lamp.
Screen Overprinting When performing color separation printing, screen overlays are used. When different colored screens are overlaid together, an unacceptable pattern will inevitably appear. This is a moire, but it can be in some form. Reduced in degree. The generation of moire also has a great relationship with color separation personnel. Each color has the same angle and yellow is at the maximum angle. In short, make sure that the next color does not interfere with the previous process color.
Although you have the correct halftone screen angle, you should also pay attention to the angle of the screen because the image is exposed on the screen plate. Interference from the screen can also produce moiré patterns on the screen, so container printers sometimes encounter moiré patterns when the screen is tilted. Of course, this situation is rare, unless you use a scalable frame. However, since the angle of the original cannot be controlled on the container printer, the screen angle must be adjusted during the screen making process. Place the color separation sheet on the taut screen and rotate the color separation sheet until the moire is at the desired angle. The same method is applied to each color separation, and satisfactory results can be obtained.
Machine Features Over the past decade, packaging container printing has evolved from monochrome and two-color printing to four- and five-color printing. However, not all container printers can produce good color prints. An important aspect of color overprinting is to maintain the machine well so that it can remain within a tolerance of ±0.005 in.
In addition, the tools provided by suppliers should have a range of accuracy, and the right tools are a critical part of solving problems. These two factors ensure that the containers are overprinted because they control the registration accuracy.
The ideal container to be printed is an outer wall with a sufficient hardness and does not serve as an expansion treatment. So make sure that the inflation pressure is the same, because over-expansion will produce the effect printed on the balloon, and the under-expansion will be printed on the pillow.
After years of hard work, machine manufacturers have developed a printing system that effectively handles the surface of the substrate. Even if the image is not printed exactly on the same spot, it still prints a consistent ink layer and guarantees registration accuracy. More and more accurate tools are also important factors in solving problems.