(1) The basic performance of PPA, plastic processing aids—PPA (1) can automatically speed up the production of film blowing or rolling, increase the production capacity of equipment, and reduce the unit output power consumption and the related management costs. PPA can automatically increase the equipment production capacity by 7-12% without changing the original process conditions of blown film and rolling equipment. Without increasing the power consumption of the main motor but increasing the screw speed, the production capacity can be further increased to 10-15%. (2) Significantly reduce the number of crystal spots produced during blown film or calendering processes, including those that cannot be directly observed by the human eye. Therefore, the “whiteness†caused by the crystal dots during fine printing can be significantly reduced. point". (3) It can significantly improve the surface smoothness of various blown film or rolled film materials, especially the microscopic smoothness shown under the optical microscope. Therefore, the transparency of various film materials, the brightness of the printing ink, and the fine printing dots The uniformity of the printing and the leveling of the fine print are all improved. (4) Eliminate longitudinal drag marks on the surface of the film material caused by the die head or device transmission components, including the longitudinal drag marks that can be clearly seen under high-intensity light sources. (5) Can reduce the die temperature 10-15 °C. Reducing the temperature of the die head is of great significance for processing various types of high-performance PE raw materials. Due to the high melt viscosity of high-performance PE raw materials, higher die temperatures are used during processing to obtain a film with higher smoothness. The high die temperature has a significant effect on the stability of the blown film. Especially in summer, because of the higher temperature of the cooling air ring, it further affects the stability of the foam. Therefore, the film blowing speed is also directly limited. PPA can reduce the die temperature by 10-15%. Therefore, it can improve the foam body properties of various types of high-performance PE raw materials processed by ordinary equipment, and provides process conditions for the purpose of improving the production speed. (6) Improve the uniformity of thickness and thickness of various types of blown film and rolled film. The uniformity and stability of the film thickness ensure the fine print quality, ensure the reliability and uniformity of the seal strength of the plastic bag, ensure the uniformity of bubble expansion of the multi-layer co-extruded shrink film and the heat shrinkage of the fine print pattern. After the proportion of contraction, there is an important significance. (7) Membranes with metallocene-catalyzed mLLDPE have uniform sealing fastness, which guarantees the reliability of the line-to-seal fastness of the seal, and the physical and chemical control of the addition amount of the metallocene-catalyzed mLLDPE. Qualitative improvement. PPA can improve the melt plasticity of mixed ingredients with different melt index. The melt viscosity of mLLDPE is higher than that of ordinary PE produced with Ziegler-Natta catalyst in high shear rate, not only Qualitative decline in body enthalpy and increase in the back pressure of the extruder, the main motor torque increased. High shear rate is a new generation of high-speed blown film, high-speed multi-layer co-extrusion blown film or calendaring equipment features. In order to improve the high-speed sealing effect of some membrane materials, some plastic bags factories often adjust the amount of metallocene-catalyzed mLLDPE to a high level, which not only increases production costs, but also worsens the process conditions of PE melts. After the use of PPA, all the above-mentioned process problems can be significantly improved. Plastic Processing Aids - PPA
(B) The use of plastic processing aids - PPA PPA additives In order to ensure good dispersion, PPA is added as a masterbatch. In the use of methods, divided into two phases: The first phase - the establishment of a high-tech metal surface coating. This stage is an important operation to fully functionalize the PPA builder. The 5% masterbatch was added and the prepared LLDPE/LDPE raw materials were evenly mixed, and the film was continuously blown for 60 minutes. According to experience, at this stage, it may be because PPA began to create a lubricant layer on the steel surface of the blow-molding equipment to “wash out†a large number of “crystal dots†or impurities that had been attached to the surface of steel and continue to blow with the film material. Plastic or calendered and brought out. Therefore, for some older film blowing machines or calendering equipment, a large number of crystal spots may appear on the surface of the film when it is used. This is completely normal. According to a large amount of experience, the equipment is basically cleaned after about 72 hours of the use of blown film or calendering equipment that has not used PPA additives in the past, and the performance of the PPA is fully exerted. The second stage - the normal production stage. The amount of masterbatch in the normal production stage is about 1% of the total weight of the PE plastic raw materials used for film blowing or calendering, depending on the blown film or rolled line speed (m/min), the film thickness, and the die of the film blowing or calendering equipment. Width of the gap, the smoothness of the inner wall of the die, and the actual condition of the raw material combination. Plastic Processing Aids - PPA
(III) Discussion on the Addition Method of Plastics Processing Aid-PPA PPA for Multi-layer Co-extruded Films Multi-layer co-extruded films are the mainstream of high-quality packaging films. At the same time, most multi-layer co-extruded films are used for fine printing. Therefore, the microcosmic smoothness of the multilayer coextruded film used for printing, the content of crystal dots visible to the human eye, and the content of microcrystallites that cannot be seen by the human eye are important contents of film quality control in terms of printability. In addition, the transparency of multi-layer coextruded films is also one of the contents of quality control. For some users, in order to improve the micro smoothness used for printing the surface layer and greatly reduce the content of crystal dots used for printing the surface layer, adding only PPA processing aids to the surface layer used for printing can achieve good results, but it can be improved. Film transparency and speed of production are ineffective. Therefore, if the user desires to improve the transparency of multi-layer co-extruded films, if the film is composed entirely of olefinic materials (PE, PP), it is recommended to add PPA to each layer. Production has actually confirmed that after PPA is added to each layer, the interlayer smoothness of the film is improved, so that the overall transparency of the film is improved. (IV) Production cost accounting (1) Reduce electricity consumption, increase production capacity, and reduce the cost of corporate management. (2) The production of high-quality products will reduce the scrap rate. (3) Increase the proportion of LLDPE use and reduce raw material costs. (4) High tensile LLDPE with a melting index of 1 can thin the film. In summary, the adoption of PPA not only does not increase costs, but also reduces the overall cost of the product. (V) About the safety of PPA The PPA meets the FDA (Food and Drug Administration) testing requirements and is absolutely safe. All types of membranes that are blown or calendered with PPA can be used for pharmaceutical or food packaging.