11. Ink bubble
Causes and solutions:
(1) Ink is mixed with a lot of air. Check the seals and piping on the suction side of the ink pump and repair if necessary.
(2) Ink pump air pressure is too large. Adjust the ink pump pressure to a minimum.
(3) Intensive ink stirring. The ink pump or agitator speed is reduced to the minimum necessary value so that the ink return line is submerged.
(4) The squeegee has a gap. 1 Change the scraper in time; 2 Adjust the angle of the scraper and seal the ink tank; 3 Adjust the pumping volume to keep the ink tank full.
(5) The ink is too thin. Add fresh ink and improve the viscosity of ink.
12. Ink color fades
Causes and solutions:
(1) Too much water is added to the ink or the car wash water is not drained. 1 Replace ink or add fresh ink; 2 Inspect and repair drains and dry the system; 3 Measure and control the amount of water in the ink.
(2) The anilox roller is worn or dirty. Clean or replace the anilox roller.
(3) Ink viscosity is too low. Add fresh ink to increase the viscosity of the ink.
(4) The ink layer is too thin. Increase the thickness of the ink layer: 1 increase the viscosity of ink; 2 reduce the amount of ink scraped by the anilox roller; 3 gradually increase the ink supply volume of the anilox roller; 4 add a transfer agent to the ink formulation.
(5) The plate pressure is incorrect. Adjust the pressure between the plate and the substrate.
(6) Insufficient ink colorant. Adjust the ink formulation according to the characteristics of the machine.
13. Inconsistent printing
Causes and solutions:
(1) Change in ink viscosity or pH. Control ink viscosity and pH.
(2) Board changes. Control board quality indicators remain consistent.
(3) Ink is mixed with other substances. Remove impurities from the ink.
(4) Printing speed and printing pressure change. When printing the same job, the process parameters such as printing speed and printing pressure are kept as stable as possible.
(5) The amount of ink transferred by the anilox roll changes. Check and clean the anilox roller.
(6) The plate has worn out. Check the plates and re-plate if necessary.
14. Ghosting
Only the image is surrounded by ghosts, causes and solutions:
(1) The pressure of the printing plate is too high. Reduce plate and board pressure.
(2) The pressure between the anilox roller and the printing plate is too large. Reduce the anilox roll check plate and liner.
Just before and after the edge has ghosting, causes and solutions
(1) The pressure between the anilox roller and the printing plate is too large. Decrease the pressure of the anilox roller and check the flatness of the plate and the pad.
(2) The plate liner is deformed. Use a thin lithography material.
(3) The printing plate is loose. Reinstall the plate to make it firm. All ghosting, causes and solutions:
(1) Improper printing plate, wear, dents, light, or improperly installed plates. Flatten or replace the liner.
(2) The ink layer is too thick. Reduce the ink film thickness: 1 reduce the viscosity of ink; 2 enhance the scraping effect of the scraper; 3 reduce the ink supply of the anilox roller.
(3) The ink layer is not uniform. 1 Adjust the parallelism of the scraper; 2 check whether the pressure between the printing plate and the anilox roller is even; 3 check the parallelism of each roller.
15. Imprint flash
Causes and solutions:
(1) The pressure between the plate and the cardboard is too great. Reduce pressure. Or between anilox roll and plate
(2) The ink pH is too low. Check and adjust the ink pH to a suitable value.
(3) The ink layer is too thick. Reduce the ink film thickness: 1 reduce the viscosity of the ink 2 increase the squeegee ink pressure; 3 reduce the anilox roller supply.
(4) Ink drying is too fast. 1 add slow drying agent; 2 stop blowing or heat drying; 3 increase the speed of the machine.
(5) The paper dust and dust in the workshop or warehouse stick to the plate. Clean cardboard, machinery, plates, etc. before printing.
16. Decolorization (not wear resistant)
Causes and solutions:
(1) Ink drying is too fast. 1 add slow heat drying; 3 increase printing speed. 2 stop blowing or add
(2) The paper has poor adsorption. The use of absorbent sex paper or a layer of varnish after printing.
(3) Insufficient abrasion resistance of the ink. Add a suitable amount of anti-wear (anti-off) agent, or switch to anti-wear resin.
(4) Insufficient use of ink resin, or insufficient stirring after adding colorant. A sufficient amount of resin is added and sufficient mechanical stirring is performed so that the colorant is completely surrounded by the resin.
(5) Ink packing is too much. Add new ink or replace ink.
1 7. Ink layering
Causes and solutions:
(1) The ink is too thin and easy to separate. Appropriately increase the viscosity of ink.
(2) Ink viscosity is not low, but the ratio is significant, may contain more additives, the specific gravity of the additive is usually greater than the ink, easy to sink. Replace ink or contact ink supplier.
(2) The ink is stored for too long and deteriorates or its performance deteriorates. Ink stability is poor, should pay attention to storage time should not be too long.
(3) When water is used, adding too much water destroys the balance of the system. Add fresh ink.
(Author/Xiao Baoping Shenzhen Yingjie Flexo Printing Technology Co., Ltd.)
"Printing Technology" corrugated box special issue 2005, 7
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