Cots, printing pressure and web gravure printing

Before we talked about several factors that affect the quality of plastic gravure printing. Gravure printing, like other printing methods, has a wide range of applications. Today we talk about several factors that affect web gravure overlay printing.

The change in paper tension is affected by the tightness of the web roll. The instability of the paper tension will directly result in the instability of the printing tension, which causes the back printing to be more advanced and lagging than the reference, and ultimately affect the quality of the printed matter. If the paper roll is too loose, making it impossible to adjust, the tension roller will fluctuate in the printing process, resulting in inaccurate overprinting.

At present, the gravure printing adopts two kinds of tying methods: static tying and dynamic tying. Grafting can also have an effect on gravure printing. When the paper is changed to paper, the tension of the paper is stable, and the paper at the unwinding machine is at a standstill under the action of the tension rubber roller. If the paper selection and paper thickness and thickness are different, the tension roller will quickly move and the paper tension Uncertainty and change will result in overprinting.

The number of paper joints in the roll also affects the quality of the gravure. Because the joints are taped to join the two papers together, they are a little thicker than the original paper. When the tip paper is overprinted, the paper tension and the printing pressure at the blanket will change, resulting in incorrect overprinting. If there are many such joints, there will be more change in printing pressure, change in paper tension, instability in printing, poor print quality, and waste of paper. Therefore, it is best not to use webs with joints to ensure the quality of printed products.

In all printing methods, the printing pressure affects the quality of printed products. Gravure printing exerts the highest printing pressure. Changes in the printing pressure, there will be printing "hair loss" and other phenomena, thus affecting the printing. The pressure of the print is affected by the roller. The use of rubber rollers for each printing unit must maintain a balance in the printing pressure. If they are inconsistent, they will affect the tension of the paper and ultimately affect the quality of the printed product. It is also important to keep the surface of the roller clean. In the process of use, the rubber roller often sticks some ink. After a long time, it will dry up and form ink skin, thus accelerating the aging of the rubber roller. It will also increase the local circumference of the roller and change the uniformity of the roller.

There are many factors that affect web gravure printing. This requires constant exploration and research in the production process.