Duplex board paper: white paper is a positive white and smooth, mostly on the back of the duplex cardboard, commonly used thickness is 250 grams -350 grams of white paper side is white, one side is gray, the price is relatively inexpensive white paper jams point. Black cardboard: as a specialty paper, double-sided black. Paper and paperboard is characterized by fine, through the heart of black, strong and thick, good folding, smooth surface, good stiffness paper supply manufacturers, good tensile, high resistance to break and so on. Commonly used thickness of 120 grams -350 grams of black cardboard. Because black cardboard inside and outside are black, we can not print in color pattern, only suitable for bronzing, hot silver craft. Made out of the bag is very beautiful, oh. Oil bag for our diet adds a lot of convenience, custom oil bag qualified for the business is not an easy one thing, especially oil bag layout increasingly seeking personalized moment, first and foremost gray balance, based on experience in the production of sea-bag practice, paper printing color is difficult to control gray balance. Gray balance under certain printability kraft paper bags, yellow, magenta, cyan RGB version at a certain ratio combining trapping outlets get different brightness achromatic (white, light gray, gray, dark gray, black) from shallow to deep bags, namely a neutral gray color oil bag visual, many factors affect, the amount of ink used for printing, paper, solid density, dot area, trapping and screen lines, will generate thousands of silk for gray balance Wanlv influence, this is the biggest test of the machine overlay accuracy and operator skill level. Those colors when printing more difficult today, small series for everyone from the professional point of view Brief custom oil bag. Guiyang paper bags, paper bags, preferred Jinxiang (certified merchants) are provided by Shandong Jinxiang Paper Limited. Road Zhiyuan, temper forward. Shandong Jinxiang Paper Co., Ltd. (jinxiangzhiye.1688.com/)(www.sdjxpaper.com) aims to become and you win symbiosis, strategic partners to move forward, more determined to become the most influential business PAPER , and you leap together to success!