Curved surface screen printing process of the most

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Surface printing process of rotating and non rotating plastic containers IV

IV. printing process of non rotating plastic containers after the plastic containers are formed, the graphics and text can be directly printed with plastic ink, which can print monochrome and various colors. The process is simple and the cost is low. Modified polystyrene, high impact polystyrene, ABS plastic, plexiglass, etc. are mostly used in radio, tape recorder, television, household appliances and computer shells. In recent years, the plastic printing process of various domestic electronic products has been widely used

the key points of the printing process of non rotating plastic containers are as follows

(1) the handwriting and graphic edges of the original negative must be flat to reduce the jagged edges of the imprinted edges. The distance between handwriting strokes must be increased by about 0.1 mm than the actual effect to avoid errors caused by the natural leveling of ink

(2) direct photosensitive method mostly uses polyester yarn with more than 110 mesh/cm. Therefore, this is because polyester yarn has high stability, which can improve the uniformity of the imprinted edge and reduce the deformation of the plate. The measured value of tension during tension should reach about 1.5 mm (mm tensiometer)

(3) use solvent resistant silk photosensitive adhesive or photosensitive film to make plates

(4) when printing special-shaped objects, suitable fixtures and special-shaped wire frames should be made. For example, when printing curved containers with small radians (about 30 °), the stretched arc process can also be used without a curved printing machine

① prepare two wooden strips first and plane them into the required radian. The groove of the fixing wire is processed on the wooden frame, and the size in the frame is generally 3 times larger than the size of the printed pattern. After stretching with the driving method, L-shaped hardware accessories are installed around the wooden frame to prevent the frame from deformation, and the blade of the scraping plate should also be in a corresponding arc. The other is the archives of various metal cutting equipment, transportation equipment, mining equipment, lifting equipment and some instruments and meters

② when the arc is exposed in plate making, it should be noted that the negative film must be close to the sand in silk bags

③ the prepared version must be fixed on the workbench with a hinge to prevent loosening and displacement during printing and blur the image

(5) correctly select the hardness of the scraper

(6) the release agent on the plastic should be removed before printing, and it is best to use fat solvents and alcohol solvents

(7) choose appropriate ink to form an ink film with good performance

(8) fully master the performance of the substrate, and correctly select the ink solvent, additives and pre press and post press processing technology

(9) when removing unqualified marks, deinking agent is generally used. Based on the above analysis, it is suggested to adopt the following deinking agent formula: 2 parts of alcohol plus 1 part of tetrahydrofuran (volume ratio), which can be used after stirring evenly, which can not only remove the printing ink, but also do not damage the surface of plastic products

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