How to Dry Cocoon/Dehydrate Cocoon in a Dehydrator
Introduction to cocoon：
Cocoon refers to the cocoon of silkworm. Cocoon drying is a process and management process that uses heat to kill the silkworm pupae in the fresh cocoons and dry them into dry cocoons, while maintaining the quality of the cocoons and preventing mildew. Silkworm cocoons are dry, commonly known as drying cocoons. In addition to killing silkworm pupae in time, preventing emergence and steaming and mildew of the cocoon layer, the main purpose is to remove most of the water in the fresh cocoons, especially drying the pupae. The water content of the fresh cocoon layer is about 11-13%, and the water content of the pupae is about 74-79%, and it is better to dry to about 15%. If it is too dry, the hydrophilicity of the cocoon layer sericin will decrease, resulting in poor relaxation.
Cocoon drying process：
Before baking silkworm cocoons with a heat pump dryer, the amount of cocoons laid is based on the thickness of the cocoons. Generally, the height of the cocoon should not exceed 2 and a half cocoons in the horizontal position. The hot air circulation dryer with vertical penetrating airflow should not exceed 3 cocoons. High is better. The main process conditions of cocoon drying are temperature, humidity, wind speed, cocoon laying amount and drying time. Among them, temperature, humidity and wind speed have a greater influence on the drying speed and quality of cocoons. Must comply with the law of moisture evaporation in each stage of drying. For example, the temperature should be gradually reduced from high to low, the humidity should be gradually increased from low, and the wind speed should be gradually decreased from high to low.The cocoon drying process is mainly divided into three stages: preheating, constant drying and deceleration drying:
1. Preheating stage: Heating the fresh cocoon, and the heat energy penetrates into the cocoon cavity through the cocoon layer to kill the pupae, so that the moisture of the pupae enters the evaporation period. At this stage, the temperature should gradually rise.
2. In the isokinetic drying stage, the pupa body has the most water evaporation and the fastest evaporation rate. During this period, the diffusion rate of the pupa body moisture is in equilibrium with the evaporation rate of the cocoon surface. The temperature of the cocoon layer is lower than the air temperature in the drying room, and the temperature of the pupa body is lower than the temperature of the cocoon layer, until the pupa body water diffusion rate. It gradually lags behind the evaporation rate of the cocoon layer surface.
3. During the deceleration drying stage, the moisture in the cocoon gradually decreases and the evaporation rate is correspondingly slower. During this period, the temperature of the cocoon gradually increased to close to the temperature of the hot air. When the inside of the pupa body begins to evaporate, the decelerated drying is transferred from the first stage to the second stage until the end of the drying.
Precautions:
Silkworm cocoons are mainly composed of cocoon layer and pupa body. Generally, the weight of cocoon layer in fresh cocoons only accounts for 18-24%. Fresh cocoons contain a lot of water. Usually, about 60 kg of water is removed when 100 kg of fresh cocoons are baked to dryness. Under normal circumstances, the water content of the fresh cocoon layer is about 13-15%, and the water content of the pupae is about 73-77%. Therefore, the drying of silkworm cocoons is mainly to remove the water in the pupae, while the cocoon layer only loses a small amount of water.
Recommendation of cocoon dryer/drying machine
Commercial 100-3000kg/h large amount of dehydration wide application and easy operation
Heat pump drying machine use the principle of inverse Carnot cycle. It absorbs low-temperature heat energy in the air, which becomes high-temperature heat energy after efficient heat collection and integration by the heat pump system, and is transported to the drying room for cyclic heating and drying of materials.It refers to exhausting the hot and humid air in the drying room directly to the outside of the drying room through dehumidification device, and then replenishing natural fresh air.
Hot air circle drying machine belongs to high temperature heat pump unit. Its working principle is: the working fluid of the heat pump is compressed by the compressor, becomes high temperature and high pressure gas, enters the condenser, condenses and liquefies the heat, and is used for air heating in the drying room. The moisture in the material is vaporized and evaporated by the form of hot air, and the evaporated water vapor is discharged by the moisture discharge system, thereby achieving the purpose of drying the drying material.
Cocoon drying video：
Previous post:
RELATED PRODUCTS
Hot News
-
Hemp Drying Machine Delivery To France
Our French customers have been in the hemp business for many years and have their own plantations. We learned through the Internet that we are engaged in the manufacture of drying equipment and consulted with us on hemp drying. The customer requires that the drying output of hemp is 300kg/h, the heat source uses an air energy heat pump, the heat can be recovered, the installation should be simple, and one container is finished.
-
8 Sets Flowers Dryer Tested Well In Client's Site
This time, we have equipped 8sets flowers dryer of model BX-15m*2.2*4layers. Drying material: flowers Output: 120 tons/day Drying machine: continuous multi-layer mesh belt drying machine Drying time: 1-2 hours
-
Henan Baixin Export 6 Sets Leaf Dryer To American!
In recent days, we have continuously exported 6 dryers to the United States! Customer drying material: leaf material Drying temperature: strict drying temperature and humidity requirements. The drying temperature needs to be kept at about 30-50℃, and the temperature is moderate, which can well retain the effective ingredients, which is conducive to the later material extraction and reprocessing...
RELATED NEWS
-
Coconut Dryer Machine Malayalam
If you want to dry coconuts, you need a professional coconut dryer machine. So what are the coconut dryer machines? How to choose the right dryer machines? Next, I will share with you three types of coconut dryer machines, coconut drying room, mesh belt coconut dryer machine and coconut dryer all-in-one machine. -
Garlic Drying Methods
After drying, the garlic not only retains the original taste and nutrition, but also is more convenient to store and carry. What kind of method can achieve such drying effect? Let's explore this issue together.
There are two ways to dry garlic. One is to do dry garlic at home, and the other is the large quantities of the garlic industry to produce dried garlic. -
Copra Drier
At present, copra drier can be divided into three types according to the output: Continuous Mesh Belt Copra Drier with output of 300-2000kg/h; Heat Pump Copra Drying Room with output of 100-5000kg/batch; and All-in-one Copra Drier with output of 100-1500kg/batch. In addition to different output, these three driers are also different in terms of heat source and working principle. Each has its own advantages, the following is a detailed introduction. -
Copra Dryer Price
Under normal circumstances, copra manufacturers dry the coconut before shipping it out. Today I will share with you the professional copra dryer by Baixin Machinery and the copra dryer price. At present, copra dryer can be divided into three types according to the output: Continuous Mesh Belt Copra Dryer with output of 300-2000kg/h; Heat Pump Copra Drying Room with output of 100-5000kg/batch; and All-in-one Copra Dryer with output of 100-1500kg/batch.
