Curved surface, non-rotating plastic container surface printing process four

After the plastic container is molded, the graphic characters can be printed directly with the plastic ink, and monochrome and various colors can be printed. The process is simple and the cost is low. Radios, tape recorders, televisions, home appliances, and computer shells use modified polystyrene, high impact polystyrene, ABS plastics, and plexiglass. In recent years, various domestic electronic products have been widely used in plastic screen printing.

The main points of non-rotating plastic containers for screen printing are as follows.

(1) The original film and the edges of the graphics must be flat in order to reduce the jagged edges of the prints. The distance between the strokes must be increased by about 0.1 mm from the actual effect to avoid errors caused by the natural leveling of the ink.

(2) The direct sensitization method uses polyester meshes of more than 110 meshes/cm. This is because the stability of polyester meshes is high, which can improve the uniformity of the edges of prints and reduce the distortion of screens. Tension measurements should reach about 1.5 mm when stretched (mm tensiometer).

(3) Apply solvent-resistant screen-sensitive or photo-sensitive film plate.

(4) When printing an irregularity, it is necessary to make applicable fixtures and special-shaped screen frames. For example, when printing a curved container with a small curvature (about 30°), a curved arc-shaped net may be used without a curved printing machine.

1 Prepare two wooden strips first and plan them to the required curvature. And fixed in the wooden frame fixed mesh groove, mesh frame size is generally larger than the size of the print pattern 3 times. After being stretched into a net, an L-shaped hardware attachment is installed around the wooden frame to prevent the frame from being deformed, and the scraping edge of the scraping plate should be curved accordingly.

2 When the arc screen is exposed during plate making, it is important to note that the film must be tightly attached to the screen.

3 The prepared screen plate must be fixed on the workbench with a hinge to prevent it from shifting during printing and blurring the image.

(5) The correct choice of scraper hardness.

(6) To remove the release agent from plastic before printing, it is best to use a fat-based solvent and an alcohol-based solvent.

(7) Select the appropriate ink to form a good ink film.

(8) to fully understand the properties of the substrate, the correct choice of ink solvents, additives and prepress processing technology.

(9) Deinking agent is generally used when removing unacceptable prints. The following ink remover formula is recommended: 2 parts of alcohol plus 1 part (volume ratio) of tetrahydrofuran, which can be used after mixing evenly to remove the printing ink without damaging the surface of the plastic product.

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