Printing Technology: Application of Thin Paper in Digital Printing and Binding

At present, digital printing technology has reached a new level, with toner, inkjet, and electronic ink technologies all becoming quite mature. However, the use of thin paper in digital printing machines remains a challenging issue. The article refers to Bible paper with a grammage below 35g/m² as thin paper. During the digital printing process, such paper often faces problems like paper jams and ink penetration. Regardless of the ink technology used, paper feeding issues persist. For inkjet systems, additional challenges include ink penetration and reduced resolution. Moreover, the binding process for thin paper digital prints is more complex than traditional post-press operations. Take the HP Indigo 5600 digital press as an example. This machine uses electronic ink and can print on paper as thin as 0.07 mm, equivalent to 60–70g/m². To accommodate paper below 35g/m², the equipment required modifications and adjustments. This article explores the challenges and solutions related to paper feeding, electronic ink adaptability, paper deformation, static electricity, and binding during the transformation test of the HP Indigo 5600. Stable Paper Transport 1. Paper Cabinet Selection The HP Indigo 5600 features four paper trays. The first one is directly connected to the paper feed bridge, with a short transport path and no turning or directional changes—ideal for thin paper. The second, third, and fourth trays are not recommended for thin paper because they require vertical feeding, which increases the risk of misfeeding. 2. Feida Suction System Feida paper is made by spraying pulp onto a felt cloth, then squeezing, drying, calendering, and rewinding. This process creates pinholes that can cause issues during suction. Thinner paper has more pinholes, making it harder for the Feida system to pick up single sheets. Conventional Feida systems may result in double feeding when handling thin paper. To address this, the paper must be smooth, firm, and have fewer pinholes. The Feida suction system on the HP Indigo 5600 should be adjusted accordingly. Unlike traditional presses, the HP Indigo 5600 has a simpler structure, limiting major modifications. However, paper separation components can be added based on traditional printer mechanisms to reduce friction-related double feeding. An air volume adjustment system can also be introduced to fine-tune suction for thin paper, using low air pressure and precise control to minimize issues. 3. Bridge Transfer The HP Indigo 5600's bridge transfer system includes paper positioning. It uses suction to move the paper. For thin paper, adjusting the suction pressure and airflow is crucial to ensure stable feeding without curling. 4. Gripping Mechanism Like traditional presses, the flatness of the gripper teeth and uniform bite pressure are key to successful printing. The HP Indigo 5600 uses a high-temperature blanket and impression cylinder to grip the paper. Uneven pressure can cause deformation or wrinkles, which become visible when passing through the high-temperature blanket. Ensuring even pressure and flat teeth is essential for quality output. 5. Swing Arm Nozzle The swing arm nozzle is responsible for turning and delivering the paper. To maintain stability, the nozzles should be evenly and symmetrically distributed. Adjusting the air intake and pressure ensures the paper is securely held without wrinkling. 6. Duplex Conveyor The duplex conveyor handles reverse printing by pressing the paper against a belt using steel balls. When printing on thin paper, the steel ball’s material or quality should be adjusted based on the paper’s surface and stiffness. Additionally, a guide device should be added to counteract air currents, ensuring smooth and stable paper movement during operation.

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