Brief discussion on three-stage drying process of silkworm cocoon dryer

- May 03, 2019 -

The drying process of cocoon dryer can be divided into three stages: preheating, constant speed drying and decelerated drying:

preheating stage: heating fresh cocoon, heat energy penetrates into cocoon chamber to kill pupa, and make pupa water enter evaporation stage. At this stage, the temperature will rise gradually and rapidly.

2. The period in which the moisture evaporation of pupae was the most and the evaporation rate was the fastest in the isokinetic drying stage. During this period, the water diffusion rate of the pupa was in balance with the evaporation rate of the cocoon layer surface. The temperature of the cocoon layer was lower than that of the air in the drying room, and the temperature of the pupa was lower than that of the cocoon layer, until the water diffusion rate of the pupa gradually lagged behind that of the evaporation rate of the cocoon layer surface.

3. The moisture content in cocoon decreases gradually and the evaporation rate decreases correspondingly during the deceleration drying stage. During this period, the cocoon temperature gradually increased to near the temperature of hot air. When evaporation begins inside the pupa, the deceleration drying is transferred from the first stage to the second stage until the end of drying. Before drying silkworm cocoons, it should be made clear that the main technological conditions of drying silkworm cocoons are temperature, humidity, wind speed, cocoon laying amount and drying time. Temperature, humidity and wind speed have great influence on drying speed and quality of silkworm cocoons. It must conform to the law of water evaporation in different drying stages. For example, the temperature should gradually decrease from high to low, the humidity should gradually increase from low to low, and the wind speed should gradually decrease from large to small.

p>strong>silkworm cocoon dryer in which the cocoon laying amount is measured by the thickness of cocoon laying, generally not more than two and a half cocoons lying horizontally is appropriate, and the hot air circulation dryer with vertical penetrating airflow is appropriate to not more than three cocoon laying heights.

Talking about the three-stage drying process of silkworm cocoon dryer. Industry provides various forms of microwave drying and hot air drying equipment, heat pump drying scheme and cost budget. This article is from the microwave drying equipment (www.bodawb.com) network.

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