Rubber sheet extruder, kneading sheet extruder, automotive insulation sheet extruder

Rubber sheet extruder
Extruder structure Extruder structure
Structure diagram of single-screw extruder Motor reduction device Cooling water inlet Cooling water jacket Hopper thermometer Heating sleeve Screw filter The transmission device of the porous plate machine head and the die base is composed of a motor reduction mechanism and bearings, etc., which can ensure the stability of the screw speed during the extrusion process, the stability of the product quality, and the ability to change speed. Feeding device Regardless of whether the raw materials are granular powder or flakes, the feeding device adopts a feeding hopper. There should be devices in the feeding hopper to cut off the material flow, calibrate the material amount and remove the remaining material. Barrel The barrel is one of the main devices of the extruder, in which the mixing, plasticizing and pressurizing processes of plastic are carried out. During extrusion, the pressure inside the barrel can reach the working temperature, which is generally . Therefore, the barrel is a container that is pressurized and heated, and is usually made of high-strength, tough, wear-resistant and corrosion-resistant alloy steel. The outside of the barrel is equipped with zoned heating and cooling devices, and each is equipped with thermocouples and automatic instruments. Screw The screw is a key component of the extruder. The structure of the general screw is as shown in the figure. Die and Die The die is the transition part between the die and the material. Its length and shape depend on the type of plastic used, the shape of the product, the heating method, and the size and type of the extruder. The quality of the machine head and die structure has a great influence on the output and quality of the product, and its size is determined based on rheology and practical experience. The cooling device cools the molten material into solids or products for easy cutting into granules or products. Coiling, cutting, post-processing, spray coating, screen printing, surface treatment, etc.
Extruder parameters Extruder parameters
Screw diameter Screw outer diameter, the commonly used diameter increases, the extruder conveying capacity increases, and the production capacity increases. The aspect ratio of the screw is the ratio of the effective length to the diameter of the working part. Usually the aspect ratio is large, the mixing is uniform, and the backflow and leakage are reduced. Long plasticization time is required, such as hard plastic powder plastic or crystalline plastic, and the aspect ratio is required to be large. Heat-sensitive plastic is easily decomposed by heat and has a small length-to-diameter ratio. When the groove depth is small, higher shear force is generated, which is beneficial to plasticization, but the extrusion productivity is reduced. The opposite is true for larger ones. changes along the screw axis. The angle between the helix angle thread and the cross section of the screw increases, the production capacity increases and the shearing effect decreases. between degrees. If the thread edge width is too small, leakage will increase, and if the output is reduced too much, local overheating will easily occur. The size of the gap between the screw and the barrel affects the production capacity and plasticizing effect of the extruder. When it is larger, the shear force becomes smaller and the production capacity decreases and the material melts and plasticizes slowly. If it is too small, strong shear force will easily cause thermal degradation of the material.
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