Printing, first need to check for poor quality materials, version to avoid so as not to flow to the production line, debug, good effect of the follow -up check the pp samples whether to conform to the requirements of the order. productions approval, head of good prenatal sample can produce big goods. In the process of productions every printed out a roll of material productions engineer must check whether the quality of the products is the same as the approval sample but avoid there are large quantities of bad product produce. After the printed products flow to the next working procedure after each procedure in the inherited must check whether the productions is the same as the approval sample.