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 第三个过程：纸张经后推气挡板之作用，再往复至第二层滚筒完成前边折边。
2.
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 第二个过程：纸张经前推气挡板之作用，再往复至第二层滚筒完成后边折边。
