Filter filter cloth use precautions
Precautions for use of filter press filter cloth: Â Â Â 1. The filter cloth should not be too loose or too tight, too loose and easy to accumulate dust, too tight and easy to pull. Â Â Â 2. New and old filter bags should not be mixed to avoid damage to the equipment and normal operation. Â Â Â 3. Replace the filter bag, first blow it with compressed air, and then check for holes. After repairing the holes, leave them for replacement. If it is dusty filter bag, rinse with water, dry and leave to be replaced. 4. Stop the filter cake when it is suitable for thickness, and then work after unloading the cake, which can extend the service life of the filter bag. Â 5. When changing the filter bag, you can not use the hard object to directly pull the filter bag to pull down, and apply the force to pull up the auxiliary belt sewn on the filter bag. Â Â Â 6. When unloading the filter cake, the unloading cake should be kept parallel with the filter cloth as much as possible to prevent damage to the filter bag. Â Â 7. When installing the filter cloth, ensure that the filter cloth on the upper part of the board frame is flat and fixed to avoid damage to the filter cloth when the board frame is pressed due to the discount of the filter cloth. Â Â Â 8. The time for the filter cake to adhere to the filter cloth should not be too long. If the filter is too long, it will cause deformation and sagging of the filter cloth. Â Â Â 9. When unloading the filter cake, shovel the filter cake in the direction of the filter cloth.
PEI plastics (polyetherimide plastics) is an amber transparent solid. It has an inherent flame retardancy and low smoke concentration without adding any additives. The oxygen index is 47%, and the combustion level is ul94-v-0, and the density is 1.28~1.42 g/cm3.
PEI plastics has a strong thermal stability, and even the non-enhanced PEI plastics still has good toughness and strength.Therefore, the high thermal stability of PEI plasticsis used to make high temperature heat-resistant devices.
PEI plastics has excellent mechanical properties, electrical insulation performance, radiation resistance, high temperature resistance and abrasion resistance, and can be used by microwave.The PEI plastics also has good flame retardancy, chemical resistance and electrical insulation.Vitrification transformation temperature is very high, up to 215 ℃.PEI plastics also has a very low shrinkage rate and good mechanical properties.Adding fiberglass, carbon fiber or other fillings to enhance the purpose of modification;And other engineering plastics of heat-resistant polymer alloys, can be in 160 ~ 180 ℃ under the working temperature of use for a long time.
The long-term use of polyether amines in the us underwriters laboratory is 338T and 356T (according to the grade), and the combustion rating reaches UL94V - 0 (10 mille thickness).The oxygen index is 47, and the polyetherimide is in line with the requirements of the aircraft for the requirements of the FAA's flame retardant and thermal release material standards.It has a glass transition temperature of 419F and is allowed to be used intermittently under 392F, at higher temperatures, resulting in a short-term shift.Under 356T, the tensile temperature and flexural modulus were above 41 and 2068MPa respectively.The material reinforced with Glass Fiber and carbon fiber has higher strength and rigidity under the transition temperature of glass.
PEI plastics long-term resistance to creep under high temperature and stress allows it to replace metals and other materials in many structural devices.PEI plastics shows good performance in variable temperature, humidity and frequency.The low dissipation factor at GHz frequency makes the polyetherimide have high microwave wearability.Its ionic pollutant is low, at 250F100 % R.H.And 207kPa after 120 hours of water extraction with the conductivity, at 20 megaohm, it can be used as an electronic sensor element insulation.
PEI plastics is a fine coating and film forming material which can be used for the coating and film of electronic industry, and can be used in manufacturing aperture < 0.1 mu m, with high permeability microporous diaphragm.It can also be used as high temperature adhesive and high strength fiber.
Application field
Since PEI plastics has excellent comprehensive and balanced performance, PEI plastics has been applied to the departments of electronics, motor and aviation, and used as metal substitute materials for traditional products and cultural life supplies.Using PEI plastics instead of metal to make optical fiber connector, PEI plastics can optimize the structure of the component, simplify its manufacturing and assembly steps, and maintain a more precise size.Used in automobile industry, such as high temperature fittings for manufacturing, the high power lamp and light, control the car cabin outside temperature sensor (air conditioning temperature sensor) and the control of air and fuel mixture temperature sensor (effective combustion temperature sensor).Also can be used for high temperature erosion of lubricating oil vacuum pump impeller, distilling apparatus that operate at 180 ℃ of ground glass joints (following), the lighting of anti fog light reflector.
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