Printing, packaging printing Shenzhen, long hung printing (certified merchants) are provided by Shenzhen Mayor David Printing Limited. Shenzhen Mayor David Printing Co., Ltd. (www.hong0755.com) is a professional "album, tag, bag, box" company. Since its inception, we adhere to the "honesty, sound management" approach, the courage to participate in healthy competition in the market, so that the "long hung" brand has a good reputation. We adhere to the "service first, customers first" principle, so long hung printed won the trust of customers congregation in paper printing, and establish a good corporate image. Special Note: This information is for reference pictures and information, please contact us to obtain the most accurate information, thank you! Printing knowledge. What is positive and negative version, left and right wheels, and world round? Positive and negative version: AB sides of a single card design and printing color pages Shenzhen, A and B, each row a separate version for the positive and negative version; left and right wheels: A total of left and right B row a version for left and right wheels; World Wheel: A Under the B version of the world total discharge of a wheel; or: Version 1 pros say two deputy version of the child, a pair are positive, and vice versa .... about 2 wheels, also called self-replica of the printed version of the child pair, turn the paper around. 3. The world round, up and down to make the paper seams, a positive and negative upper and lower row, head to head or feet on the foot. Habit of saying, if the imposition is the pros and cons of India, since the turn over, roll turning distinction. Long hung printing custom paper packaging boxes printing carton wallet belt carton largely for its exquisite styling and decor printing plant in Shenzhen to promote landscaping products, improve the competitiveness of goods. Because of the shape and structure of the design of the tray often to be determined by the shape of the characteristics of packaged goods, so a lot of its style and type, rectangular, square, polygon, shaped cartons, cylindrical, etc., but its basic manufacturing process the same, that the choice of materials - design icon - Manufacturing Template - Stamping - joined into boxes.