Synthetic paper in the inorganic filler (calcium carbonate, talc, wollastonite, titanium dioxide, etc.) accounted for about 60% to 80% of the total mass of synthetic paper, according to the different use of synthetic paper, adding PP, PE and other resins and a variety of chemical Additives, after blending, modification, extrusion process, production into a special masterbatch.
At present, domestic and foreign synthetic paper is divided into rolling method, casting method, blown film method, two-way drawing method and non-woven paper method, according to the structure and use requirements are divided into single layer synthetic paper, three synthetic paper, Synthetic paper and multi-layer synthetic paper.
1, synthetic paper – rolling production method
calendering process: ingredients, blending, mixing, extrusion production into a special masterbatch, and then after extrusion, rolling, stretching, cooling , Surface treatment, cutting, coating, that is synthetic paper. Some of the process to take a special masterbatch and rolling sub-production, foreign advanced production equipment also take a continuous molding process.
Rolling method of high efficiency, good product quality, paper surface is smooth, suitable for printing high-end pictures and books cover and so on. Its shortcomings is the complexity of the process, the larger the proportion of products, equipment prices more expensive.
2, synthetic paper – casting production method <br style=float:none; /> casting method of production and rolling method is basically similar. Casting method is characterized by die extrusion speed and casting roller rotation there is a certain speed difference in the die extrusion of the meniscus and the cooling roll between the formation of stretching, according to product requirements, synthetic paper The thickness can be adjusted. PP products for the matrix resin more, with good rigidity, toughness, good tensile strength and so on. Due to the production process to make the molecular structure of the product has a one-way, synthetic paper longitudinal, horizontal physical properties have some differences.
The use of polypropylene resin, the production of shopping bags, boxes, aircraft and shopping malls with food packaging, the appearance of fine, but also natural degradation.
3, synthetic paper – blown film production method Blown film production of synthetic paper with the PE to more, mainly to three co-extruded blow molding more, and some use single Layer, five layers, multi-layer production process, according to product use, synthetic paper in the outer layer of appropriate increase in resin content, the inner layer of inorganic powder content, the layers of materials are different. Product longitudinal, horizontal stretching can be adjusted within a certain range, so that synthetic paper products, uniform thickness, physical stability.
This process is characterized by high yield, simple process, the product thickness uniform, small investment in equipment, but because of the high resin content, the width of the paper has a certain limit.
Blown film method is divided into blowing and blowing method:
Synthetic paper blowing method as shown: synthetic paper blowing method as shown:
4, synthetic paper – one-way stretch production method uniaxial stretching method with the rolling, casting similar extrusion process, the installation of one-way stretching system, after longitudinal stretching After the molecular chain distribution of resin uniform, synthetic paper, the vertical physical properties are basically similar. In the uniaxial stretching process, synthetic resin and inorganic powder due to material performance differences and interface compatibility and other reasons, will produce difficult to observe the small gap, commonly known as “island phenomenon.” These phenomena can reduce the proportion of synthetic paper and production costs, but also to the synthetic paper’s physical properties, appearance, color, moisture absorption and so on are significantly improved. Especially after stretching will form a certain pearl effect, so that paper printing with gorgeous exquisite effect, for advertising inkjet, exquisite pictures and so on. One-way stretch process equipment complex, large investment, production technology skills, in the popularization of synthetic paper will be subject to a variety of early restrictions. But the product performance, low production costs, wide range of uses, the process will be the development of synthetic paper, is also the international application of advanced processing technology.
5, synthetic paper – non-woven paper production method US DuPont its non-woven production process applied to synthetic paper production process, the substrate is mainly polypropylene, the production of ” Non-woven synthetic paper “. After the raw and auxiliary materials are melted, the very fine silk fibers are extruded and formed into a nonwoven synthetic paper by rolling.
Products with paper characteristics, the proportion of light, strong permeability, the physical and mechanical properties, color strength, product deformation is small. The product can be widely used in furniture decoration, product packaging, interior decoration wallpaper. But the process of production costs higher, complex processing equipment.
At present, many domestic manufacturers are in the trial production of synthetic paper, many companies are still raw materials, equipment, technology and other aspects of a variety of innovative research, such as: heavy / light calcium blending, PP / PE composite, blending / extrusion One-step production process and so on.
For more information on the production process and equipment of the “Synthetic Paper” project, Pars Kavosh Polymer Machinery Co., Ltd. welcome you to call, contact or visit our company to discuss and exchange on the “synthetic paper / stone paper” production technology, Equipment matters!