Second process: After operated by the front forward gas baffler, the paper reciprocates to the drum of the second layer to perform flanging of the backside.

纸张经后推气挡板之作，第二层滚筒完成前边折边。

Third process: After operated by the back forward gas baffler, the paper reciprocates to the drum of the third layer to perform flanging of the front side.

纸张经前推气挡板之作，第二层滚筒完成后边折边。