The alumina ceramic PC material must be dried to reduce its water content to below 0.02%. The molecular weight of the PC board raw material should be 35,000.
The length-to-diameter ratio of the extruder screw is 20:1, the length of the feeding section and the metering section in the rod each account for 25% of the Molded Tablets Focusing Potentiometer Ceramic Substrate full length, and the depth of the screw groove is constant, and the length of the compression section is half of the full length. The screw compression ratio is 2.5-3; the depth of the screw groove should generally be less than 4 mm; the mixing effect with a pin screw is better.
Over-shading net group can adopt 80/120/200/120/80 mesh type.
The coat hanger head is more commonly used, but the cost is more expensive. The sheet calendering method includes horizontal extrusion calendering sheet, oblique direction extrusion calendering sheet, downward or upward extrusion calendering sheet. But currently the best is Molded Tablets Focusing Potentiometer Ceramic Substrate the inclined roll calendering method. Typical PC board extrusion conditions:
Machine temperature 260, 280, 300℃, head temperature 2801C, calendering roller temperature: upper roller 121-135℃, middle roller 129-139℃, lower roller 132-150℃, screw speed 12-24 rpm , Filter group 40/60/100 mesh.
PC board can be used for automobile, airplane windshield glass, corrugated board, folded board, building window glass, sports facility ceiling glass, etc. Others: PC can be blended with ABS to improve impact strength. When ABS is added at 50%, the increase is greatest. When the ABS content is too small, such as 3%, the impact strength will decrease instead.
PC can be blended with HDPE. When the HDPE content is 30%, the blending effect is better, which can improve the impact strength, improve the processing fluidity, and is easy to fill the mold. LDPE has a very poor co-won effect, and can not be used due to delamination. PC can also be Molded Tablets Focusing Potentiometer Ceramic Substrate made into a film, which has high puncture resistance and is suitable for welding and heat sealing. The surface tension of the PC film is large, no corona treatment is required before printing, and the electroplating performance is also good. It can be used in medicine, food packaging, and decorative board in combination with cardboard.
More than 100 studies have explored the ecological response of polycarbonate bisphenol A leachates. Howdeshell et al. found that at room temperature, an endocrine disruptor, Bisphenol A (C15H16O2) (bisphenol A), appears to be infiltrated into water from polycarbonate animal cages, and it may be Molded Tablets Focusing Potentiometer Ceramic Substrate the cause of the development of female reproductive organs. A paper published by vom Saal and Hughes in August 2005 on the analysis of the effects of low doses of bisphenol A leachate seems to have found an implied relationship between financial support and conclusions: research funded by industry appears to be inclined Yu found no significant impact; government-funded research tends to find significant impact. Easy to react with other substances
Sodium oxide and other alkaline cleaners should not be used on polycarbonate fibers or they will cause the release of Bisphenol-A (C15H16O2), a known endocrine disruptor (affecting the reproductive system). It is characterized by non-crystalline thermoplastics, high-quality heat resistance, good transparency and high impact resistance and other physical and mechanical properties.
advantage:
1. With high strength and elasticity coefficient, high impact strength, wide temperature range;
2. High transparency and free dyeability;
3. H.D.T. high;
4. Poor fatigue resistance;
5. Good weather resistance;
6. Excellent electrical characteristics;
7. Tasteless and odorless, harmless to human body, in line with hygiene and safety;
8. Low molding shrinkage and good dimensional stability.
How to make alumina ceramics?
2020 11/10