In the modern packaging industry, corrugated board is one of the most popular packaging materials due to its excellent protective properties and sustainability. Today, we will take an in-depth look at the operation of a five-layer corrugated board production line, revealing the key technologies and steps behind its efficient operation.


What is five-layer corrugated board?
Five-layer corrugated board, also known as double-pit corrugated board, is made up of two layers of corrugated core paper and three layers of boxboard stacked alternately. This structure provides greater compressive strength and durability for heavy-duty packaging and long-distance transportation.


Production Line Introduction
The 5-ply corrugated board production line is a highly automated system that contains several processes and equipment. It mainly includes paper roll stand, preheater, single facer, gluer, laminator, dryer, calender and slitter. The following are the detailed steps of the production line operation:


1. Raw paper loading
The production process starts with raw paper loading. The paper roll stand feeds containerboard and corrugated medium into the line sequentially. Each roll is heated by a preheater to improve its flexibility and bonding effect before entering the subsequent equipment.


2. Corrugated Forming
The corrugated core paper is formed into corrugated corrugations by heating and pressure in a single-sided machine, and bonded with a layer of containerboard to form a single-sided corrugated board. This process ensures the corrugated structure of the core paper and provides the necessary strength and flexibility.


3. Laminating and bonding
Two single-sided corrugated boards are glued in the laminating machine through the gluing machine, and bonded to the two sides of one layer of intermediate containerboard to form a five-layer structure. The precision and bonding effect of this step directly affects the quality of the final board.


4. Drying and calendering
After lamination, the corrugated cardboard is dried by a drying machine to ensure that the adhesive is fully cured. At the same time, the board is flattened in a calender to improve surface flatness and aesthetics.


5. Slitting and Stacking
Finally, the dried and calendered corrugated board is transported to the slitting machine, where it is cut to the size required by the customer. The slit cardboard is automatically stacked and ready for packing and shipment.


Key technologies of the production line
Automation Control
The five-layer corrugated cardboard production line utilizes an advanced automation control system, which is capable of real-time monitoring and adjusting various parameters in the production process, such as temperature, pressure and speed. This not only improves production efficiency, but also ensures product consistency and stability.


Energy saving and environmental protection
Modern production lines are designed to focus on energy saving and environmental protection, reducing the impact on the environment by optimizing energy use and reducing waste emissions. For example, the heat recovery system can effectively utilize the waste heat generated during the production process and reduce energy consumption.


Quality Control
Quality control is a top priority in the production process. Online testing equipment monitors the bond strength, thickness and surface quality of corrugated board in real time to ensure that every piece of board that leaves the factory meets strict quality standards.


Summary
The efficient operation of a five-layer corrugated board production line relies on advanced technology and strict management. High quality and stability of corrugated board is ensured through automated control, energy saving and environmental protection, and strict quality control. Understanding these production processes and technologies not only helps us better understand the corrugated board production process, but also provides an important reference for the development of the packaging industry.


We hope this article can give you a better understanding of the five-layer corrugated board production line. If you have any questions or need further information, please feel free to contact us.