Calcium plastic paper is a new type of paper that contains almost two-thirds of inorganic substances. It has many varieties such as "artificial wood", "foam material" and "calcium plastic paper". At present, it is collectively referred to as calcium-plastic materials in our country.
Since inorganic salt is a fairly stable compound at normal temperature, it is hardly soluble in water, heat-resistant, and non-flammable. Therefore, the calcium plastic paper made with it as the main body also has the following characteristics: good chemical stability, not afraid of water, no moisture absorption, heat resistance, not easy to burn, even if it catches fire, it burns very slowly, almost no black smoke, after burning There is only a little white ash left. Calcium plastic paper also has relatively high burst resistance and tear resistance, and has a certain absorption force for ink, so it is suitable for printing, even color printing. In appearance, it is indistinguishable from ordinary paper.
Calcium plastic paper is different from synthetic paper. Its main components are inorganic substances, while synthetic paper is composed of organic polymers. Calcium plastic paper can be processed into offset paper, coated paper, tracing paper, etc., and can also be used to make book cards and securities. It can also be made into light corrugated cardboard boxes, etc.
The cost of calcium plastic paper is not high, but some properties need to be improved, such as evenness, smoothness, refractive index and so on.
The production process of calcium plastic paper is roughly as follows: First, the raw materials (calcium carbonate is generally used in CHINA, and some other inorganic calcium salts with fineness meeting the requirements can also be used, and there are also microcrystalline calcium sulfites produced by roasting limestone and combining with sulfur dioxide, etc.) And a small amount of polyolefin resin (such as polyethylene) and auxiliary materials (such as foaming agent-isodiformamide, cross-linking agent- dicumyl peroxide, mold release agent-stearic acid, stabilizer-tribasic lead sulfate) and so on in the mixer to mix evenly, and then use a two-roller kneader to carry out strong kneading at a temperature of 160 ℃, relying on the action of mechanical force to make the fine calcium carbonate (about three microns in diameter) embedded and melted In the state of the resin, the last thing rolled out by the kneader is a semi-finished product, a sheet. Calcium plastic paper is then rolled and stretched by the rollers of the rolling mill.
