Ten operational details that affect the drying speed of bone china cup blanks

Hello everyone, it's time for everyone's favorite Guangdong Hosen chinaware ceramic knowledge small class time again! Today, I would like to share with you the ten operational details that affect the drying speed of the ceramic tableware cup body during the production process: 1. The heat transfer rate accelerates the heat transfer rate, which can increase the drying rate: ①Increase the temperature of the drying medium, such as increasing The hot gas temperature in the drying kiln should be increased by adding a hot blast stove, etc., but the surface temperature of the green body cannot be increased too fast to avoid cracking; ②Increase the heat transfer area: such as changing from single-sided drying to double-sided drying, layered stacking or reduction The number of billet layers is increased on the contact surface with hot gas; ③Increase the convective heat transfer coefficient. 2. Outer diffusion rate When the drying is in the stage of constant speed drying, the outer diffusion resistance becomes the main contradiction for the entire drying rate. Therefore, reducing the outer diffusion resistance and increasing the outer diffusion rate have the greatest impact on shortening the entire drying cycle. The external diffusion resistance mainly occurs in the boundary layer, so the following should be done: ④Increase the flow velocity of the medium, reduce the thickness of the boundary layer, etc., and improve the convective heat transfer coefficient. It can also increase the convection mass transfer coefficient, which is beneficial to increase the drying speed; ⑤Reduce the water vapor concentration of the medium, increase the mass transfer area, and increase the drying speed. Third, the internal diffusion rate The internal diffusion rate of water is a combination of moisture diffusion and thermal diffusion. Moisture diffusion is the movement of moisture in the material due to the humidity gradient, and thermal diffusion is the movement of water caused by the temperature gradient in physics. To increase the internal diffusion rate, the following should be done: ⑥ Make the direction of thermal diffusion and moisture diffusion consistent, that is, try to make the center temperature of the material higher than the surface temperature, such as far-infrared heating, microwave heating; ⑦When the direction of thermal diffusion and moisture diffusion are the same, Strengthen heat transfer and increase the temperature gradient in the material. When the two are opposite, although the enhanced temperature gradient expands the resistance of thermal diffusion, it can enhance heat transfer. The temperature of the material increases, and the moisture diffusion increases, so drying can be accelerated; ⑧Decrease Thin body thickness, change from single-sided drying to double-sided drying; ⑨Reduce the total pressure of the medium, and increase the wet diffusion coefficient, thereby increasing the wet diffusion rate; ⑩Other factors such as the nature and shape of the body.
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