1, pad printing introduction
Pad printing is a complementary means of expansion of screen printing, refers to the use of copper or steel intaglio, cast into a hemispherical shape by the silicone rubber pad printing head, which is pressed to the layout of the ink transfer to the substrate to complete the transfer of the printing method. The substrate is an irregular shaped surface (such as instruments, electrical parts, toys, etc.).
(1) Typical products: Used for printing on the interior of transportation, consumer electronics and sports equipment.
(2) Suitable output: single piece to large quantities.
(3) Quality: Achieve sharp printing details, even on uneven surfaces.
(4) Speed: Individual printing time (1-5 seconds).- Advantages: (1) Wide range of applications: pad printing is generally used in grooves, the back of the workpiece, such as screen printing can not be processed workpiece, because there is no screen printing mesh limitations, pad printing pattern accuracy is relatively higher some, because the pad printing machine is an automatic device with high precision, so it can be printed in sets of colors, theoretically the number of colors can be unlimited, but not more than 7 colors in actual operation. (2) easy to operate: fully automatic operation of the equipment. (3) low cost: in addition to the equipment is much more expensive than the screen printing machine, but other cost factors with the same screen printing.
3, disadvantages:
(1) Ordinary effect: the visual effect of the finished product is slightly more polished than screen printing, but not far away.
(2) Area limitation: because the silicone pad printing head rely on elastic work, and the production of the size of the upper limit, so pad printing can not produce an area of too large a pattern.
(3) Color scale limitations: Although pad printing can be set color operation, but due to the corrosion of steel plate processing out of the groove edge clear, so still can not produce gradient color.
(4) construction taboo: in the case of using UV ink for construction, you need to use a dark room or pay attention to shading to prevent UV ink curing damage to the pad printing die head and steel plate.4, pad printing process:
The steel plate is coated with ink;
The pad printing machine starts;
The silicone pad printing head descends to the steel plate;
Stick the ink on the character pattern on the silicone pad printing head;
The pad printing head is moved to the top of the substrate and lowered, the ink on the surface of the silicone pad printing head is transferred to the surface of the substrate;
Repeat the above operation.
Water transfer process flow:
Transfer batch lamination → activation (with a special solvent to make the pattern on the film activated into the ink state) → transfer (the use of water pressure will be transferred to the pattern on the object to be printed) → washing (will be the residual film rinsed with water) → drying (will be printed on the object to dry) → spray lacquer (sprayed on the surface of the PU transparent lacquer to protect the surface)5、Abnormal process and analysis
(1) Phenomenon: bubbles or sand holes
Original solid: pad printing rubber tip is too soft, the rubber tip is too flat and not easy to exhaust, rubber tip surface damage; steel plate etching is not in place; ink is too thick or dry too fast; product surface dust or oil; ink deterioration or expiration.
Solution: Replace the suitable rubber tip; redo the pad printing steel plate; add the appropriate additives; clean the surface with alcohol; replace the new ink.
(2) Phenomenon: blurred pattern
Original solid: pad printing adhesive tip is too soft; loose fixture; the tip falls fast; steel plate etched too deep; ink is too thin or too thick; product surface with dust or oil.
Solution: replace the hardness of the appropriate glue head; check whether the fixture to fix the product is loose; adjust the drop speed of the glue head; replace the depth of the steel plate; the use of additives to adjust the consistency.
(3) Phenomenon: the tip does not stain the ink.
Original solid: glue head surface oil; ink concentration is too large thick; ink drying speed is too fast; etching pattern is too shallow, or the printing plate defective products; glue head angle is too large; pattern color block is large scraper to the middle of the pattern of the ink to scrape away; take the pressure of the ink is too large.
Solution: use alcohol to deal with clean paper; add the right amount of thinner; the use of slow-drying thinner; replacement of the printing plate; the use of adhesive head angle is slightly flat adhesive head; increase the dots or use thick steel plate; reduce the ink pressure.
(4) Phenomenon: ink drawing
The original solid: the ink viscosity is too large; rubber head rising too fast; rubber head surface damage or use too long deterioration.
Solution: adjust the most suitable viscosity or consistency of ink; adjust the rising speed; replacement of the rubber head; ink filler to improve the pulling situation.
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