Fresh fruits, tender meat chunks, and newly harvested ingredients are placed into the freeze-drying chamber. Under the combined action of low temperatures and a vacuum, moisture quietly sublimates, leaving behind a finished product that retains its original shape and vibrant color while suffering almost no loss of nutrients. Unlike hot-air or spray drying, the freeze-drying process involves virtually no high heat. Consequently, it maximizes the retention of the material's original form, natural color, heat-sensitive nutrients (such as vitamins, anthocyanins, and polyphenols), and its porous, airy microstructure. KEMOLO freeze dryers utilize precision temperature control systems and stable vacuum environments to ensure that materials neither collapse nor over-dry during sublimation. However, the moment the process concludes and the chamber door opens, the real challenge begins. Why are standard packaging methods unsuitable? To understand this, one must first appreciate the "fragility" of freeze-dried products. After processing in a Kemolo freeze-dryer, the product's moisture content is typically reduced to below 3%—or even less. This extreme dryness makes the product highly sensitive to humidity. Upon contact with atmospheric moisture, it rapidly reabsorbs water, loses its crisp texture, and may even foster microbial growth, rendering all previous efforts wasted. Furthermore, light and oxygen are the "natural enemies" of pigments and natural nutrients like anthocyanins and vitamins. Which packaging solution is considered the optimal choice for freeze-dried products? Aluminum foil laminated pouches, which utilize a metallic aluminum layer as the core barrier material, offer irreplaceable advantages: a near-zero water vapor transmission rate completely blocks external moisture; an extremely low oxygen transmission rate effectively delays oxidative degradation; total light-blocking capabilities eliminate the risks of light-induced fading and photochemical reactions; and reliable heat-seal strength ensures package integrity and airtightness. Yet, simply placing the product inside an aluminum foil pouch is not enough. Residual oxygen within the pouch can still cause slow oxidation. Therefore, flushing the pouch with an inert gas—nitrogen—before sealing displaces the oxygen, thereby minimizing the rate of oxidation. Experimental data shows that after 120 days of storage, nitrogen-flushed aluminum foil packaging retains as much as 79.59% of anthocyanins—a performance far superior to that of standard packaging. For freeze-dried products requiring long-term storage, oxygen absorbers are often included within the package to eliminate trace amounts of residual oxygen, thereby maximizing freshness preservation. KEMOLO understands that a high-performance freeze dryer is merely the starting point for a quality product. Consequently, we go beyond supplying reliable freeze-drying equipment; we are dedicated to providing comprehensive technical support that covers everything from the freeze-drying process to packaging selection. Whether in the fields of food processing, biopharmaceuticals, or functional foods, KEMOLO can tailor the optimal freeze-drying solution and packaging recommendations to your needs, ensuring your products maintain peak quality and commercial value from production through to the end consumer.
WhatsApp: +8615380024001 E-mail: sales@kemolo.com https://www.kemolo.com/ https://www.liofilizador.com/ https://www.freeze-driers.com/ https://www.freezedryer.com.cn/
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