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Paper forming machine: stack several independent forming machines on long net. Generally, it is composed of 2 or 4 independent long net forming machines, each of which has its own sizing system and flow box. Used to produce multilayer cardboard. Make the current most popular board molding machine. There are two kinds of layout forms of the web stack molding machine. Figure 4-63c in page 138 is a common layout form with compact structure. The length of the core layer network can be determined arbitrarily, and the low layer network can be greatly shortened. Interlayer bonding l problem of web folding molding machine: it is necessary to control the dry degree of combined paper between 10 and 14 percent. Control the pressure of the composite roll on the paper width and the vacuum degree of the real empty box: the composite roll is a hole roll, the pressure is too small and the binding is poor, and the over-assembly will produce the net mark. Spray starch glue at the junction. Transmission problem: control the speed difference and distribute the load correctly. Features: compared with garden net paper machine, it has the advantages of good evenness, low horizontal and horizontal tension ratio and high speed. But big investment, high operation requirements; Compared with the paper plate machine of the superforming machine, the quantity and speed range of the machine can be copied, the machine can adapt to higher speed, but the investment is large.