As a long - standing supplier of white duplex board, I've witnessed firsthand how its production technology has changed over the years. When I first stepped into this business, the white duplex board production was a far cry from what it is today.
In the early days, the production of white duplex board was a relatively simple and labor - intensive process. The raw materials mainly consisted of recycled fibers and some virgin pulp. The recycled fibers were sourced from old newspapers, magazines, and cardboard boxes. These materials were collected and sorted, then sent to the pulping machine. The pulping process was basic, using large vats where the fibers were soaked in water and chemicals to break them down into a pulp. This pulp was a bit rough and inconsistent in quality, which affected the final product's smoothness and strength.
The forming process was also quite primitive. The pulp was poured onto a wire mesh conveyor belt. Gravity and simple suction devices were used to remove the water from the pulp, gradually forming a wet sheet of paper. Then, this wet sheet was pressed between a series of rollers to squeeze out more water. But the pressure was not evenly distributed, leading to uneven thickness and density across the board. Drying was the next step, and it was done using large steam - heated cylinders. The drying process was slow, and it was difficult to control the moisture content precisely. As a result, the boards often had varying moisture levels, which could cause warping or cracking later on.
The quality of the early white duplex board was mediocre at best. The surface was not very white or smooth, and it lacked the stiffness and durability required for high - end applications. Most of the products were used for basic packaging, like packing some ordinary consumer goods.
But as time went on, things started to change. With the development of new technologies and the increasing demand for higher - quality products, the production technology of white duplex board began to evolve rapidly.
One of the major breakthroughs was in the raw material selection and preparation. Instead of relying solely on recycled fibers, more and more high - quality virgin pulp was introduced. Virgin pulp, usually from pine or eucalyptus trees, has longer and stronger fibers. This not only improved the strength and stiffness of the white duplex board but also enhanced its surface smoothness and whiteness. The pulping process also became more sophisticated. Advanced chemical pulping methods were adopted, which could break down the fibers more effectively and remove impurities more thoroughly. This resulted in a purer and more consistent pulp.
In the forming process, modern machines with better control systems were developed. The pulp is now fed onto the wire mesh using a highly precise headbox. The headbox can distribute the pulp evenly across the width of the wire, ensuring a more uniform thickness and density of the wet sheet. Vacuum systems are used to remove water more efficiently, and the pressure from the rollers during the pressing stage is precisely controlled. This leads to a more homogeneous board with better physical properties.
Drying technology has also advanced significantly. Infrared drying and hot - air drying systems have been integrated, which can dry the board more quickly and evenly. Moisture sensors are installed throughout the drying process to monitor and adjust the moisture content in real - time. This ensures that the white duplex board has a stable moisture level, reducing the risk of warping and cracking.
The surface treatment of white duplex board has also come a long way. Coating technology has been widely applied. By applying a thin layer of coating on the surface of the board, the whiteness, glossiness, and printability are greatly improved. There are different types of coatings available, such as clay - based coatings and polymer - based coatings, which can be selected according to different customer requirements.
Today, white duplex board has a wide range of applications. It is not only used for general packaging but also for high - end packaging, such as Clothing Packaging Cardboard One - side White One - side Gray Base White Board Paper. This type of board is perfect for clothing packaging, providing a clean and professional look. For the fashion industry, Cashmere Sweater, Cardboard Round Neck Shirt, T - shirt, Whiteboard Paper, Clothing Lining Paper White Duplex Board With Grey Back For Custom Printing Solutions is very popular. Custom - printed white duplex board can add value to the clothing products and attract more customers. And Garment T - Shirt Lining Fabric Packaging Paperboard Shirt Forming Board Paper Shape Printing Good Quality White Duplex Board Wtih Grey Back is used for T - shirt lining and packaging, ensuring the clothes are well - protected during transportation and storage.
As the production technology of white duplex board continues to evolve, we are committed to staying at the forefront of this industry. We invest in the latest equipment and research to improve our products' quality and performance. We understand that different customers have different requirements, and we are capable of providing customized solutions.
If you are in need of high - quality white duplex board, whether for clothing packaging, general product packaging, or other applications, we'd love to have a chat with you. Contact us to discuss your specific needs, and our team of experts will work with you to find the best solution. We look forward to the opportunity to serve you and help your business succeed.
References
- Industry reports on paper and board production technology evolution
- Manufacturer's brochures and technical documents of white duplex board production machines