（三）Rotary single- face corrugated unit

1920 pairs of corrugated cardboard come out, corrugated packaging products manufacturing technology and the use of development is very rapid. During the First World War, wooden crates accounted for 80% of the transport box, while only 20% of corrugated boxes, in the Second World War, corrugated boxes in transport packaging has accounted for 80%. While the sharp decline in the use of wooden boxes, corrugated boxes to become the most important transport packaging containers. Corrugated packaging products, production technology and equipment and the simultaneous development of corrugated boxes applications. The early 20th century, 20, corrugated production technology began to stand-alone production instead of early manual operation.

In 1922, 1.32 m format of the single-face electric corrugated machine was born.

In 1923, the emergence of the 1.6-meter single-face corrugated machine.

In 1925, 1.88 m format single-face corrugated machine come out.

In 1938, 2.2 meters wide single-face corrugated machine launched.

To the 20th century, 40 years, continuous rotary single-faced corrugated units come out. 50 years of the 20th century, the world economy, the rapid development of trade, driven by the situation, there will be multi-channel coherent operation of double-sided corrugated board production line. The initial period of the width of the cardboard production line is generally only 1000 ~ 1600mm, running speed is only 60 ~ 100m / min. After the advent of single-sided corrugated board after 64 years of development, 1950, double-tile composite corrugated board assembly line was born. In 1959, to create a mechanical linked corrugated board production line.