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1. When mounting plates on the rewinder, ensure they are tightly secured and firmly pressed to prevent relative slippage during printing. In actual production, the ideal printing pressure is typically controlled around 0.15-0.25mm. It must be emphasized that the ideal printing pressure is the minimum force required to achieve sufficiently solid impressions of the image areas on the plate onto the paper, with clear and complete halftone dots, while maintaining a certain degree of compression deformation on the printing surface.
2. Since self-adhesive labels consist of two layers of coated paper, the paper thickness requires corresponding adjustments to the double-sheet controller gap. Increase the distance between the pressure tongues of the side and front guides and the paper feed plate.
3. Increase the distance between the rewinder's feed pad and the impression cylinder surface, as well as between the feed pad and the delivery plate. Maintain this distance at approximately the paper thickness plus 0.3mm.
4. Adjust the printing pressure on the rewinder. During offset printing, adjacent cylinders—plate, blanket, and impression—transfer ink through contact and compression. To ensure proper ink transfer onto the paper and accurately reproduce continuous-tone text, lines, images, and halftone dots, additional printing pressure is essential beyond surface contact between cylinders. The intensity of printing pressure and the accuracy of its adjustment directly determine the quality of image transfer and halftone reproduction—specifically the size, depth, and clarity of ink coverage. When printing self-adhesive labels, adjust the center distance between the impression cylinder and blanket cylinder by increasing it by approximately 0.2–0.4 mm. When switching from thicker to thinner paper, add the thickness reduction—equivalent to the padding removed from the plate cylinder—to the blanket cylinder padding. Conversely, when transitioning from thinner to thicker paper, reduce the blanket cylinder padding by the corresponding thickness and add it to the plate cylinder padding.
5. When printing self-adhesive labels, pay attention to adjusting the paper feed section. Increase the airflow of both the suction nozzle and the blowing nozzle in the paper feed section.
6. Replace the paper separation suction nozzle and the paper feed suction nozzle with rubber rings of larger diameter and greater thickness to ensure stable paper feeding and prevent wobbling of the feed rollers.
7. Since self-adhesive labels consist of two layers of coated paper, the thickness requires increasing the gap of the double-sheet detector. Additionally, the distance between the pressure tongues of the side and front guides and the delivery plate should be increased.
8. The distance between the rewind machine's delivery pad and the impression cylinder surface, as well as between the delivery pad and the delivery plate, should be increased. Maintain a distance approximately equal to the paper thickness plus 0.3mm.