1. Introduction：
Four layer cardboard paper machine, paper trimmed width is 3700mm, mainly used for cardboard paper making . Paper machine is consist of headbox, wire section, press section, front drying section, oblique surface sizing machine, back drying section, calender section, reel section.

2.Headbox:

With four air cushion type headbox, corresponding to top layer, lining layer, core layer , bottom layer, and by controlling the gas pressure in the headbox to control and stabilize the sizing of the pulp.

3. Forming section:

Four layer include top layer, lining layer, core layer and bottom layer. The main components are consist of breast roll, forming board, Dewatering board, vacuum box, composite roll, suction couch roll, wire drive roll, wire guiding roll and paper machine framework.Top layer, lining layer, core layer and bottom layer are respectively equipped with one forming section respectively.

4. Press section:

First press, second press, third press and fourth pressure. The first press is vacuum press with vacuum suction roll which equipped with one rubber coated metal roller, one vacuum press roll; The second and third press are all MG press and each with one upper and lower rubber coated metal roll; The fourth press is glossy press which equipped with one stone roller and one rubber covered metal roller. The first three press are respectively equipped with wire guiding roll and felt suction box and upper & lower felts. These four press is pressurized by the hydraulic cylinder pressure.

5. Front drying section:

Φ1500/Φ1800 dryer drove in groups and equipped with wire guiding roll , dry wire and closed gas hood.

6. Oblique surface sizing machine:

One surface chrome-plated metal roller and one rubber coated metal roll. its pressurized way is corrugated tire pressure.

7. Back drying section:

Φ1500/Φ1800 dryer drove in groups and equipped with guiding roll , dry wire and closed gas hood.

8. Calender section:

Double roller calender, the upper and lower rollers are metal roller, pressurized way is corrugated gas tire pressure.

9. Reel section:

Pneumatic horizontal reel machine and pressurized way is cylinder pressure.