1. Characteristics and application of aBS tube The aBS resin has been introduced in Chapter 1, which is a copolymer of acrylonitrile, butadiene, and styrene. Pipes molded from aBS resin have synergistic effects and characteristics of three monomers. aBS pipe is tough, hard, rigid, dimensionally stable, non-toxic, chemically resistant, wear resistant, heat resistant, cold resistant and electrical, etc., and the surface is easy to chrome; but the aBS tube is not resistant to ketones, aldehydes and chlorinated hydrocarbons. . Due to its superior performance, aBS pipes are widely used and can be used in some areas to replace metal pipe applications; aBS pipes can also be used as hot air ducts and water and drainage pipes for the marine industry and for transporting certain temperatures and pressures. Chemically corrosive liquid, can be used in the temperature range of -20 ~ +70 °C. However, it is important to note that this type of pipe should not be used outdoors. 2, aBS tube extrusion molding production process aBS resin drying treatment → extruder plasticizing raw materials to make it molten state → mold forming tube blank → cooling setting → traction → cutting → inspection → check into the warehouse 3, equipment selection The aBS pipe extrusion molding mainly adopts the single-screw extruder. The structure of the screw should generally be selected with the same thread pitch and thread depth as the gradient type. The mutant screw structure can also be selected, and the aspect ratio is relatively small, generally (12-18). The range of :1 is selected, and the compression ratio is (34):1. The mold for forming a pipe is a straight-through general-purpose structure. 4, aBS pipe extrusion molding process technical conditions 1 Raw material selection. There are many kinds of aBS resin, and it should be selected for the resin for extrusion molding, such as E-7, E-3 or E-1 aBS resin produced by Lanzhou Petrochemical Industry Co., Ltd. Synthetic Rubber Factory. 2 Before the raw materials are put into production, they should be dried in an oven at 70-80 °C for 4 h. The water content is controlled to be below 0.1%. 3 The plasticized raw material is in a molten state, the temperature of the extruder barrel is 150-165 ° C for the feeding section, 165-180 ° C for the plasticizing section, and 170-180 ° C for the homogenizing section. 4 The molding die temperature for forming the tube blank is 175 to 190 °C. 5 The draft ratio is 1 to 1.2. 6 The circulating water temperature for cooling and setting is 15-22 °C. 5, aBS tube extrusion molding matters needing attention 1 The process temperature control of extruded aBS resin should be used as low as possible. Keep in mind that the residence time of the melt in the barrel should not be too long to avoid decomposition of the melt. The melt decomposition temperature was 250 °C. 2 When producing aBS pipe, always pay attention to observe the color of the melt, and control the fairness with the molten yellow color as the plasticizing temperature. When the melt is light gray, the temperature of the barrel is too high, and the temperature of the barrel should be lowered immediately. 3 The spacing of the sizing set should be controlled within the range of 15 to 35 mm. 4 If the process temperature of the barrel is controlled fairly, but there is still a phenomenon of melt decomposition (the color of the melt is light blue), the length-to-diameter ratio of the screw should be considered to be smaller. 5 The working speed of the screw should not be too high, generally not exceeding 20r/min. Solar Lawn Light,Solar Flame Lawn Light,Solar Led Lawn Bollard Lights,Solar Lawn Light Outdoor Yantai LUHAO Lightig CO.,Ltd , https://www.luhaosolar.com