A freeze dryer is a machine that helps you preserve food by removing as much moisture content and while retaining its physical characteristics. In effect, you get a longer storage life without altering any flavors.
Freeze drying, or lyophilization, is a sophisticated dehydration process that takes place entirely within a freeze dryer. This process is designed to preserve perishable materials while maintaining their structure and nutritional content. Here's how the process works inside a freeze dryer, broken down into the key steps:
The food is frozen to -40℉ or lower.
After the food is frozen, the freeze dryer uses a vacuum pump to pull out the air inside its chamber. The ice in the food then changes into a misty gas. The freeze dryer takes this gas away, leaving only dry food behind.
Once the food is dry, it's sealed in mylar bags with oxygen absorbers. Mylar bags block light and moisture, and oxygen absorbers remove air. This combo keeps the food fresh until opened.
When the freeze-dried food is ready to be consumed, just add water. It will taste, smell, and look as if it's fresh.
Once the freeze drying process is complete, the product must be promptly sealed in moisture-proof packaging to prevent reabsorption of water and maintain its quality until rehydrated. For added protection against oxidation and to prolong shelf life, it's recommended to include oxygen absorbers inside the packaging. When ready to use, the freeze-dried product is rehydrated with water, returning almost to its original state, while retaining its original structure and nutritional content.
A freeze dryer offers remarkable versatility, allowing you to preserve a wide range of items, from everyday foods to specialized products such as:
Consider the following points when buying a freeze dryer
Choosing the right freeze dryer can be a complex task given the number of options available, along with various technical aspects to consider. If you're feeling overwhelmed or simply need some professional advice, we're here to help!