Packaging Trademarks Screen Printing Note

For screen printing and packaging trademarks, the production technology and design of the bottom plate are different due to the difference between screen printing and other printing. To sum up, in the screen printing plate making, the main concern should be the following issues.

(1) Multi-map joint design. The combination of one edition, one map, and multiple associations is a distinctive feature of packaging trademark plates. It requires that the accuracy of overprinting of platemaking must be high. In the past, manual solarization was very troublesome. First, the electric extension swept out a set of negative images, and then used a masking process to make the positive image into a graphic version. If a layout had 20 images, use a positive image to copy it into 5 identical shades. In the figure, the five negatives are combined into one, and then the nails are copied four times, finally forming a 20-joint positive version. The biggest drawback of this process is the serious loss of outlets and inaccurate overprinting. Afterwards, instead of using the tanning machine, although the accuracy of overprinting was solved, the problem of network loss could not be solved fundamentally. The application of a color desktop system now makes it difficult to duplicate the past tedious manual work and solved the problem of missing and overprinting of outlets.

(2) Hollow and mosaic designs. Packaging trademark platemaking often encounters processes that require hollowing and inlaying. In particular, in the case of manuscripts that require printing and printing of silver and silver, the platemaking must be made into a stencil mosaic. Otherwise, if it is supposed to be printed once, it must be changed to two printings. Because the gold and silver inks are not directly printed on the ink, the ink is wet and wet and the ink is printed wet. This can easily cause the shortage of gold and silver ink and cause darkening of the color.

(3) box shape design. Die cutting is an indispensable process for packaging trademark printing plants. Among them, the die cut size is required to be precise, and the design of the box shape is the basis for ensuring the quality. Most of the customers are unclear about the details required in the box-shaped design, or the size of the box drawn by hand in the draft is inaccurate. If it is copied as it is, it is difficult to guarantee the quality of the final molded box. Therefore, when platemaking is required, variable processing is performed according to the box size provided by the customer, the thickness of the sheet of the sheet, the size of the box, and the shape of the folded sheet, etc., so that an accurate multi-connection can be made. Die cutter wire version.

At present, ready-made packaging box-shaped design software is available abroad, and packaging box-shaped design software has also been developed in China. In the future, the application of these softwares in the high-end networking system of electric extensions will result in the standard box shape size and reasonable combination pattern as soon as the corresponding data is input, so that the box-shaped design of the packaging trademark will be standardized and standardized.

Screen printing plates directly manufactured using emulsions are currently widely used in screen printing. Similarly, in the case of packaging trademark screen printing, plates are generally prepared using a direct plate making method. The manufacturing process and technical problems to be noted are as follows.

The basic process characteristics of the direct plate making method

The screen printing plate process directly manufactured with the emulsion is: screen degreasing → screen drying → gluing sensitized film → stencil drying → stencil replenishing sizing → stencil drying → exposure → developing → stencil drying → checking and revising.

The method of operation of each process is as follows.

Screen degreasing: stencil printing is done directly with photographic emulsions. Before the stencil is made, the stencil version must be degreased with a suitable degreasing agent or liquid.

Screen Drying: After the screen plate has been degreasing, it should be rinsed with clean water, and all the water on the screen plate should be sucked with the air brush, and then thoroughly dried at room temperature.

Gum sensitized adhesive: The diazo emulsion is evenly applied to the screen plate using a suitable applicator, usually wet to wet.

Stencil Drying: The stencil that has been coated with the emulsion must be placed horizontally in a dry box with the print face down and the drying temperature must not exceed 40 degrees Celsius.

Template replenishing coating: In order to eliminate the unevenness of the photographic plate of the stencil, a layer of sensitized adhesive can be added on the printing surface of the stencil.

Stencil drying: Dry again in the same way as for the first drying. The drying temperature must not exceed 40 degrees Celsius.

Exposure: Stencil exposure of the stencil using a suitable light source, such as a metal halide lamp. Exposure time is determined by graded exposure. Development: Use a suitable water pressure spray gun for spray development. Rinse the images completely. Pay attention to the developer's explanation of the development temperature.

Stencil drying: Use an unused newspaper or hygroscopic cloth to gently wipe off excess water from the plate. If it is a large number of plate-making production, it is necessary to use a special device to suck in moisture. Finally, the plate is dried in a drying oven.

Revision: Any pinholes and flaws in the screen printing plate can be covered with a water-soluble screen filler and undergo revision.



Author/Lin Qishui