Dong Il Paper Starts up Rebuilt Containerboard Machine in South Korea

Dong Il Paper Manufacturing Co., South Korea, has successfully started up the containerboard machine at its Wolsan mill in South Korea after a wet end rebuild. Valmet (Finland) supplied key components of the wet end rebuild: a new two-layer headbox and vacuum assisted forming board for middle ply. The rebuild increases the end product quality and enables the mill to produce four-ply containerboard with help of Valmet's new headbox technology.

This is the first implementation of Valmet's OptiFlo headbox with Aqua layering technology.

"Valmet's OptiFlo headbox with Aqua layering technology opens new possibilities for us to develop our process and product. We have already seen the potential of the technology on how strength properties can be improved. Unlike with conventional technologies, a rapid starch feeding response can be measured when starch is fed through Aqua layer; in both cases,15% compression strength (RCT) improvement is achieved, but the needed amount of starch is almost 30% lower with Aqua technology. Even in chemically challenging process conditions, the technology enables great results," Jin Doo Kim, VP, Dong Il Paper, said.

Valmet explains that the OptiFlo headbox with innovative Aqua layering technology makes it possible to produce a two-layer sheet with good layer coverage using only one headbox and forming unit. The Aqua layering technology is developed for the most challenging stratified solutions where layer purity is a key feature. It produces a perfect, disturbance-free, purely layered structure that boosts strength properties.

In containerboard grades, this type of layering provides further possibilities to adjust the quality and strength properties. It enables the use of different furnish qualities, cheaper raw materials, and functional additives between layers while giving flexibility to develop improved end products.

Dong Il Paper Manufacturing Co., is a privately-owned paper company established in South Korea in 1986. The company has four paper mill sites in Ansan, Wolsan, Uiryeong, and Dongwon that produce various containerboard grades such as liner, test liner, and corrugated medium.

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