Proper Storage Methods for Preserving Silk Cocoons

Effective storage of dried silk cocoons is crucial to maintaining their quality and ensuring a consistent supply of raw material for silk production. This involves protecting them from moisture, mold, pests, and physical damage. The following methods are essential for successful cocoon storage.

1. Preparing the Cocoon Storehouse

A suitable cocoon storehouse is fundamental for long-term preservation. Key considerations include:

• Location: The storehouse should be situated on high, dry ground to minimize moisture exposure.
• Construction: The building must be designed to be moisture-proof, airtight, and well-ventilated, allowing for climate control.
• Ground Protection: A wooden cocoon frame or pallet, elevated roughly 50 cm from the floor, should be used to store the cocoons. This provides insulation against dampness and temperature variations. The cocoon frame should also be kept about 50 cm away from the wall.
• Storage Layout: A transport channel, approximately 120 cm wide, should be incorporated to facilitate movement and accessibility. The cocoons should be piled in a criss-cross manner to reduce the contact area with air and increase the volume that the storehouse can accommodate.

2. Proper Stacking of Cocoons

The way cocoons are stacked affects their stability and preservation. The following methods are recommended:

3. Managing Moisture and Humidity

Controlling moisture and humidity is critical since dry cocoons readily absorb moisture, which can lead to mold growth and damage, impacting the quality of the silk.

• Optimal Humidity: The ideal relative humidity for storing cocoons is between 60-70%. This range minimizes the risk of mold development. The reasonable moisture regain rate of dry cocoons is about 11%.
• Ventilation: Doors and windows should be opened for ventilation when the temperature and relative humidity outside the storehouse are lower than inside. This helps to dehumidify the environment.
• Moisture Absorption: If needed, moisture-absorbing materials such as calcium chloride, calcium sulfate, or quicklime should be used to reduce humidity.
• Consistent Environment: Temperature and humidity should be kept relatively stable to avoid repeated moisture absorption and dehumidification, which can degrade sericin protein and negatively affect cocoon quality.

4. Preventing Mold and Fungi

Several types of mold can harm stored cocoons. Each has distinctive characteristics:

5. Controlling Pests and Rodents

Insect and rodent infestations can severely damage stored cocoons. Common pests include:

To control pests, chemical insecticides are advised, which are employed before cocoons are stored. Rodenticides are also recommended to prevent rodents from damaging the cocoons.

By meticulously following these methods, the quality and value of stored silk cocoons can be effectively preserved, ensuring high-quality raw materials for silk production.