In the stone paper production process
, first the stone should be broken to a small enough size and screened to meet the fineness requirements of the powder to at least 1500 mesh. Then the powder is subjected to a modification treatment and the resin is mixed with the raw materials to granulate the pellets. A single-screw high-speed rotation machine is used to make a gel fluid and extrudes a certain thickness of the sheet. The sheet is then subjected to rolling by a roller and the casting machine stretches to form a desired thickness of stone paper, remaining in the process. The edge material can be recycled and reused. The final paper can be applied to the coating equipment on both sides to make it have better printing characteristics.
At present, the plastic rolling four-roll machine used in the stone paper production process can only be pressed to the thickness of the sheet, and the thickness of the qie stone paper is only 0.01 mm. This kind of plastic calender obviously cannot meet the needs. Publication No. CN102373648A discloses a calender specializing in the production of stone paper, including a roller, a motor, a transmission gear, a distance adjusting device of a roller, and an electric control device. Among them, there are 10 rollers. In addition to the two feed rollers A and B, the C-H rollers are two or two matching calender rollers. The device uses five calendering and two calendering and stretching, which is beneficial to melting some powder particles that are not easily plasticized, and has good foam discharging capability. It can form a substrate with a thickness of 0.8mm to better meet the demand for the stone paper production.
The invention patent application with the publication number CN102229188A provides a method for producing a three-layer structure lightweight stone paper. In this method, three layers of raw materials having different compositions are thrown into three extruders to co-extend the paper film, and then the paper film is subjected to foaming at 160° C. to 170° C. The processed stone paper has a hollow structure inside, so as to reduce the weight of stone paper. Compared to stone paper with the same thickness, the weight of the foamed layer of lightweight stone paper is 18% to 35% lighter, and the presence of holes makes the interior of the stone paper have a vertical support structure, which also improves the Stiffness of the stone paper to some extent.