Pre-processing before storage of dried products – An indispensable step in the SUNSAY freeze-drying value chain.

In the modern dried food production chain, many mistakenly believe that once the drying process is complete, preservation is simply a matter of packaging. However, in reality, pre-treatment before storage is the crucial factor in maintaining the long-term quality of the finished product.

For businesses using SUNSAY freeze dryers, this becomes even more important. Products dried using freeze-drying technology have low moisture content, retaining their original color, flavor, and texture – but this also means they are very susceptible to re-absorbing moisture if not properly handled before packaging and storage.

Why is pre-treatment necessary before storage?

SUNSAY freeze dryers operate at low temperatures (approximately 25–50°C), preventing heat-induced deterioration of products, but also making them susceptible to moisture absorption from the environment if not properly protected. After drying, the food remains slightly warm, and if packaged immediately without proper cooling, the released moisture will be trapped inside the bag, leading to condensation, mold growth, or changes in appearance.

Furthermore, freeze-dried products often have a porous, lightweight texture, and characteristic brittleness or flexibility – making them more sensitive to outside air. Therefore, proper processing before storage or packaging is not just an option, but a mandatory requirement in any production line aimed at sustainable quality.

Pre-processing steps before storing dried products.

To optimize the efficiency of SUNSAY food heat pump dryer and ensure output quality, production facilities need to perform several standard processing steps immediately after the drying process is complete:

• Cooling the product: After removing it from the drying chamber, the product should be allowed to cool naturally in a clean, dry, and well-ventilated area. Do not package the product while it is still warm.
• Moisture stabilization: Allow the product to rest for approximately 30–60 minutes to allow the moisture to redistribute evenly throughout the interior, minimizing shrinkage or surface cracking due to sudden environmental changes.
• Removing defective products: This is when the entire batch is inspected, separating out any parts that do not meet the requirements in terms of appearance, color, or show signs of localized moisture.
• Pre-packaging treatment: Depending on the type of product, additional measures such as vacuum sealing, adding desiccant packets, or treating with inert gas may be applied before packaging.
• Trial storage: Some businesses also implement a short-term sample retention step to evaluate the ability to maintain quality under simulated conditions, helping to optimize packaging and actual storage temperatures.

Common risks associated with neglecting post-drying treatment.

No matter how advanced the drying technology is, if post-processing is not given proper attention, the following risks can absolutely occur:

• Rapid re-moisture absorption: By simply leaving the freeze-dried product exposed to high humidity for a few hours, it can reabsorb water, soften its texture, and reduce its shelf life.
• Unusual odor in the packaging: Packaging products while they are still hot can create a phenomenon called “product sweating”—condensation forming tiny droplets inside the bag, causing the product to change smell after a few days.
• Sensory changes: Dried fruits may turn brown, medicinal herbs may lose their aroma, or herbs may clump together if not properly cooled.
• Increased defect rate: Even a batch with only 10–15% moisture-contaminated products can significantly impact overall credibility during shipping or long-term storage.

For export businesses, being rejected by partners simply because of mold or loss of flavor is not an uncommon lesson – and most cases stem from a lack of proper post-drying processing.

The role of SUNSAY freeze dryers in quality preservation.

SUNSAY’s difference lies not only in its energy-efficient freeze-drying technology, but also in its commitment to supporting customers throughout the entire production process. SUNSAY engineers regularly advise and establish post-drying processes tailored to each type of material, from flowers and fruits to medicinal herbs and seafood.

In particular, SUNSAY freeze dryers are capable of precisely controlling the final moisture content of the product thanks to their intelligent sensor and control system. However, maintaining that effectiveness after the product exits the drying chamber requires close coordination with the processing and storage stages.

In other words, SUNSAY is not just an equipment supplier, but a technology partner that accompanies you throughout the entire product value chain

A sustainable process cannot be without a post-drying step.

Today, consumers evaluate products not only based on taste, but also on preservation quality, safety, and the experience after opening the package. A dried product that looks appealing, retains its color and aroma, but quickly deteriorates after a few days, will seriously erode trust, especially in high-end markets such as organic food, exported medicinal herbs, or specialty fruits.

Therefore, pre-treatment before storage of dried products is not a secondary step, but the final finishing step that helps shape commercial value. For products from SUNSAY freeze dryers – where higher quality is required – investment in post-drying should be included in the production plan from the outset.

Investing in post-drying processing is an investment in long-term value.

If we consider the drying process as the core technology, then preservation is where the quality of that technology is “tested.” A product dried correctly but preserved improperly can still fail when it reaches the consumer. And pre-preservation treatment of dried products is the boundary between success and risk.

With the support of SUNSAY freeze dryers, businesses can better control the moisture content and quality of their dried products. However, to ensure that value isn’t lost in storage or on store shelves, make sure you dedicate sufficient time and resources to the final processing stage. This is how to make products holistically – not just drying, but leading to successful commercialization.

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With more than 15 years of research and innovation, SUNSAY’s team of talented engineers has crafted a perfect solution for enhancing the value and preserving Vietnamese agricultural products. SUNSAY not only helps drying become faster and more efficient, but also opens up new opportunities for the sustainable development of the agricultural industry.

With competitive prices and outstanding quality, SUNSAY has affirmed its position as the ideal partner for those who love to improve the quality of agricultural products. SUNSAY’s freeze dryer not only preserves the flavor and nutrition, but also preserves the freshness and appeal of the fruit. Not only that, SUNSAY also demonstrates perfection through the design of the fruit drying factory to meet the growing needs of customers.

Come to SUNSAY to experience our difference and professionalism. We are committed to providing completely free product sample drying services, helping you feel completely secure about the quality and effectiveness of SUNSAY cold dryers. We not only contribute to enhancing the value of Vietnamese agricultural products but also promote the development of the domestic agricultural industry.

For detailed advice, please visit website: kynghexanh.com.vn or immediately contact Hotline (Zalo): +84 935.995.035 or switchboard number: +84 94.110.8888 for support.

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