Talc powder is made from talc block by screening, cleaning, drying, batching, grinding, grading, packaging and other processes. It is a white powder with a slippery feel, with obvious lubricity, fire resistance and acid resistance. Excellent physical and chemical properties such as high insulation, high melting point, chemical inactivity, and strong adsorption. Because of its many excellent quality, it is widely used in coatings, paints, plastics, paper, ceramics, cosmetics, pharmaceuticals, food, daily necessities and other industries.
Most of the talc powder production uses twin-screw extruders, which are widely used in food production, plastics manufacturing and other industries. In actual production, due to the adhesion of materials or the difficulty of materials flowing through the feeding equipment, the production efficiency of the equipment is reduced or even affects the normal production. From the perspective of improving the economic efficiency of enterprises, it is necessary to optimize the twin-screw extrusion process to maximize production efficiency.
Common optimization methods currently include optimizing the feeding system, using the feeding control system, and working with intelligent drives . These optimization methods must take into account the material's characteristic parameters, and it is difficult to generalize all materials, so it is limited in practical applications.
Another highly effective optimization in production is to increase production efficiency by adding powder to a twin-screw extruder. This method is called Feeder Strengthening (PET) .
In PET technology, a certain amount of powder needs to be added, and a vacuum is applied to the barrel to remove the air, and the added powder is left in the barrel and a material cake is formed on the barrel, by adding a barrel on the barrel. The friction coefficient improves the transmission power and achieves the purpose of improving the conveying efficiency. At the same time, these added powders can effectively remove the air in the barrel to reduce the volume of the material and increase the amount of feed. The actual effect of PET technology is closely related to the properties of the powder.
Studies have shown that sloping stone powder can increase yield by 250% under the same conditions, and the yield increase effect is very significant. Under the same operating conditions, other powders such as calcium carbonate hardly increase the yield. For example, a 45 mm twin-screw extruder is used to fill 40% talc polypropylene. In the optimization of PET without talc, the twin-screw extruder has a power transmission efficiency of 54% when the twin-screw extruder is above 600 kg/hr. Through the use of talc-optimized PET technology, the power transmission efficiency is significantly increased, the output can be increased to the maximum value under motor dynamic conditions, the power per unit material is reduced, and the profit margin of 20 ¢/kg can be increased by 500 kg/hr. The annual added profit reaches $600,000.
Source : Network
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