To increase the overall effect of the packaging, a lot of clients in the design of packaging, will design a larger area of the color, if not good control in the printing process, will greatly reduce the grade of the product, thereby affect the competitiveness of products in the market. So from the quality control of raw materials and operators at the time of printing technology quality is strictly required.
1. Each batch do not match the color or the same batch
(1) in the proofing for the first time, be sure to put the blade Angle, ratio of ink to do detailed records.
(2) the printing before control, due to the color of ink is commonly own, so make sure the ink bias, accuracy ratio, ink plate, stir the ink stick, ink pump to clean up. The previous use of the rest of the ink to add right amount to the new ink, according to the record set scraper, ink viscosity.
(3) the printing must control the ink viscosity, suggested that to increase artificial measurement frequency or degree of automatic tracking regulator.
2. Transfer of ink uneven
(1) on the palette should minimize ink varieties, can use two colors out of don't three colors, different manufacturers of ink can't mix, mix well after fully stir well, and add the appropriate butanone dissolve. Join solution should be slowly join and stir evenly, so as not to impact caused solubility with solution, printing ink structure, resulting in the transfer.
(2) reduce the scraper blade pressure and Angle (more color) is applied to the transition.
(3) water lines
Increase the ink viscosity, because the color version of sunken into the deep, generally is 30 ~ 35 um, so ink stained through low there will be water lines, and suggested that the 120 ~ 150 m/min speed use 22 seconds to 20 seconds (ChaEn 3 cups)
3. The indentation diagonal
(1) reduce the impression roller pressure.
(2) glial soft embossing roller, change good embossing roller, hardness of 75 shaw.
4. The peel strength is not enough and with speed
Because, the color of the packaging commonly 40% ~ 60%, even more, so the color of the peel strength must be better, could be controlled from the following aspects.
(1) substrate surface tension to conform to the requirements, not less than 38 dyne/cm.
(2) choose suitable for base material type of ink.
(3) choose a lower surface tension of solution, to reduce the surface tension of the ink system, so as to improve the wettability of the base material.
(4) increasing oven to heat and air, if the oven heat, air volume is small, the color of ink on the big, cause adhesion and stripping is not enough.
In brief, to control the color to printing, also need to seriously summarizing, improve operator awareness of product quality, seriously good every barrier, achieve excellence. (Gold Printing Group) |
