Field operation of flexo labels

Flexographic printing is a form of letterpress printing. It has been widely used in the United States and some European countries. In China's printing industry, flexographic printing can still be said to be in its infancy. However, in recent years, flexographic printing has shown unique advantages in the field of packaging and printing in China, and has made considerable progress. At present, China has introduced more than 300 flexo printing production lines, and its production methods have been accepted by more and more domestic packaging and printing industry.

Since Shanghai People's Printing Factory No. 8 introduced the first flexographic printing production line in 1992, it has already had five flexographic printing production lines of five colors, seven colors and nine colors. These flexo printing presses are mainly used for printing various types of self-adhesive stickers, coffee and sugar packaging, tea packaging bags and various alcohol labels. In the second national quality evaluation of flexographic printing products in 2000, the “biggest breweries” and “Kweichow Moutai” wine labels of Shanghai People's Printing No. 8 Factory were rated as quality awards. I have been engaged in flexo printing labels for many years and have accumulated some experience in flexo printing. However, in practice, such problems will arise and need to be resolved.

For example, when we printed the product Lipton Black Tea, because it was full-printed, 63 gm offset paper was used, and the amount of ink was large. During the printing process, it was dried by an oven. Finally, the printed product was found on both sides of the paper. Both are upturned, which brings great inconvenience to customers' products during the packaging process. In order to solve this problem, I came up with a way to use water over the back of the paper before printing so that after the finished product is printed, it won't rise so much, reducing the customer's packaging process. Loss in the.

Another example is when we printed another product called "Joint Pain Relief Cream", we also encountered some problems. Originally, we used Aksu 2000 water-based inks for printing this product, but in order to reduce costs, we switched to water ink of Mudan brand of Shanghai ink factory. Because the black ink viscosity of the Mudan brand ink is not very stable, and the internal particles are coarser, the black version is easy to paste, and a flexible version cannot be replaced for a long time. This not only can not reduce costs, but also can not be guaranteed product quality. Later, we constantly communicated and studied with the master of the Shanghai Ink Factory, adjusted the composition of the ink, and added an appropriate amount of pH stabilizer during the printing process, so that the finished printed product was clearly printed and the loss of the plate material was also reduced.

When we printed the labels, we used the method of cutting into individual sheets and then punching. However, the punched products did not neatly cut, and customers often reported that they would cause downtime when labeling, resulting in abnormal production of customers. Go on. Later, after research and trial production, the online die-cutting method was adopted to solve the problem of punching irregularities, thereby giving full play to the advantages of fast delivery of flexographic printing. The daily output is about 600,000 pieces, which increases the output and saves the cost.

Today, it has been nine years since the Shanghai People’s Printing Eight Factory introduced a flexographic printing press. In actual printing production operations, we feel that we must do a good job of flexographic printing. The most important thing is to adjust the pressure of the printing plate so that we can print it out. Exquisite products.

In the process of using flexo printing for many years, we encountered various problems. After continuous practice and accumulation of experience, we can objectively say that we basically grasped the operation method of flexographic printing. The above mentioned some experiences, not to mention very mature, willing to learn from peers. Looking ahead, we believe that China's flexo printing industry will thrive

Reprinted from: Chinese Flexo