The pH value of the dampening water refers to what? PH value is expressed as a wetting liquid containing acid, alkali content value (concentration) of the bridge box printing and packaging boxes, with the negative logarithm of the hydrogen ion concentration represents an acid solution alkaline. ph = 7 is neutral solution, pH> 7 is alkaline solution, pH. Production of the wetting liquid pH value should be controlled to what extent? PS version of the wetting solution pH value, the general control between 5 and 6 students is appropriate. . Wetting liquid PH value control box printing cosmetics boxes improper bridgehead, the impact on product quality stronger acidity:? Likely to cause the plate flower version, dot becomes smaller, reducing printing anti-Indian forces, ink easy emulsification, resulting in blots not easy to do, and so the quality of product on the back of offset ills. Acidic weak: the printing outlets easy to paste, easy and, easy to play dirty, resulting paste version, dirty and so on. Measures to avoid the control sheets (1) process design to be appropriate (2) the book enters the clip book, a folder of the pitch should be moderate, it is necessary to allow normal access to the books, it can not open too much, in order to prevent signatures because the material soft and deformed, they can not lead to less long car or milling back, forming sheets. (3) milling back must be wholly milling, milling through (folding platform the first and last note must bundling, or may not burring milling, forming sheets), attention must not be milled slung bridge color box printing, or vulnerable to the formation of loose pages. (4) Avoid pulling knife slot passive or incomplete bridge box printing customization or two pull-groove cutter is only one work, another to not work; to avoid the host and the pull grooves speed does not match the groove spacing becomes large, plastic the amount of penetration and bonding point fewer sheets; avoid milling back and pull the knife slot knife height height mismatch makes groove depth is not enough, but also easily lead sheets. (5) must be strict monitoring of hot melt adhesive temperature glue pot preheating temperature setpoint should be slightly higher than the value and continued glue pot preheating glue must be timely, non-raw rubber directly into the glue pot. Bridgehead box printing gift box, beyond printing (certified), the bridge box printing by the Dongguan City, often beyond packaging products factory provided. Dongguan Chang-ping beyond packaging products plant (www.dgcyp.com) Dongguan, Guangdong, printing paper leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In all walks of life beyond the printing leadership with the staff warmly welcomed the inquiry negotiations to create a better future beyond printing.