Date: 2016-07-19
The criss-cross delivery is a key feature in the layout and functionality of high-speed printing presses, particularly in offset printing. It plays an essential role in managing how printed sheets are handled after they pass through the printing units. This method is designed to optimize the flow of printed sheets, ensure smooth handling, and avoid jamming or misalignment during the delivery process.
What is Criss-Cross Delivery?
In a criss-cross delivery system, printed sheets are stacked or arranged in a way that creates a criss-cross or interlaced pattern. The primary aim of this layout is to improve the overall stacking process, reduce the potential for damage to the printed sheets, and ensure that sheets remain in perfect alignment. The system allows for a more efficient transfer of printed sheets from the press to the finishing area, such as the bindery or the stacker.
How It Works
A criss-cross delivery system typically includes multiple delivery belts or conveyors. The sheets are passed along these belts, with each conveyor positioned at different angles to one another. As a result, when the sheets are delivered to the end of the press, they overlap in a criss-cross fashion. This arrangement helps in several ways:
Prevents Jams: By interlacing the sheets, it minimizes the chances of multiple sheets sticking together or jamming.
Reduces Damage: The criss-cross pattern helps distribute the weight of the sheets evenly, which prevents warping or damage during the delivery process.
Increases Efficiency: The pattern allows for faster delivery, as the sheets are handled gently and can be processed further without disruption.
Benefits of Criss-Cross Delivery
Improved Sheet Handling: The interlaced pattern helps in smoother transitions between various stages of the printing process. Sheets are less likely to slip or get misaligned during delivery, which ensures they are ready for further processing such as cutting, folding, or binding.
Space Efficiency: Criss-cross delivery systems are often more compact compared to traditional systems, as they allow more sheets to be delivered in a smaller space. This makes them ideal for high-speed presses with limited space in the delivery area.
Reduced Operator Interference: Since the sheets are delivered in an organized and structured way, the need for manual intervention to adjust or realign sheets is minimized. This reduces labor costs and allows operators to focus on other aspects of the press.
Applications in Modern Printing
Criss-cross delivery systems are widely used in large-scale offset presses, such as those by Heidelberg, Komori, and Manroland. They are particularly beneficial in high-speed presses that need to handle large volumes of paper without compromising on quality or efficiency. The system is especially useful in packaging printing, commercial printing, and other applications where fast delivery and precise handling are critical.
Conclusion
The criss-cross delivery system is a highly effective solution for improving the efficiency and quality of sheet handling in high-speed printing presses. By ensuring that printed sheets are delivered smoothly and without damage, it helps printers maintain the speed and consistency required in modern printing operations. Whether for commercial printing or packaging, this technology is essential for maintaining high standards in the production process.
Author: Ahmet Karakus
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