How to return the tide how to return the tide

Tobacco leaves after baking typically have a very low moisture content, usually between 5% and 8%. This dryness makes the leaves fragile, which can lead to significant losses in both yield and quality. To prevent this, tobacco leaves must undergo a process called "resurfacing" or "rehydration." This process slightly softens the leaves, making them more manageable for subsequent steps like tapping, removing twists, and stacking, thus preserving their quality and overall value. The standard for resurfacing varies depending on the intended use. For tobacco that will be smoked immediately, the moisture level should reach around 14% to 15%. If the tobacco is meant for grading and sale, the moisture content needs to be higher—between 16% and 18%. If the moisture is too low, the leaves become brittle and break easily, reducing both yield and quality. On the other hand, if the moisture is too high, the leaves may darken in color, lose their shine, and develop a condition known as “flushing.” Excess moisture also increases the risk of mold, further degrading the quality of the tobacco. To determine if the resurfacing is complete, you can check the texture of the leaves. When properly softened, the leaves feel slightly damp and do not crack when touched. The base of the veins should not break easily, and the leaves should feel pliable. At this stage, the moisture content is generally around 16% to 18%, which meets the national standards for purchase. If the tobacco is not being sold right away, it should be stored carefully. The ideal moisture level for storage is around 15%, as this prevents mold while keeping the leaves from becoming too dry. These leaves will feel dry with a slight rustling sound, and the veins are more likely to break. Therefore, they should be stacked with care and covered with plastic film to maintain the right humidity. If the moisture content exceeds 18%, the leaves will feel wet and sticky. The main vein becomes flexible, and the leaves are difficult to pull apart. After being placed upright, the leaves may droop and clump together, leading to an "oil out" phenomenon. Dark wrinkles may appear on the surface, and the leaves cannot be restored to their original state. Such tobacco not only fails to meet national acquisition standards but is also prone to overheating and mold during storage. There are several methods for resurfacing tobacco leaves. One common method is using a hot air circulation barn. This technique ensures even rehydration and reduces damage during handling. After the baking process is complete, once the temperature in the barn drops below 40°C, 3 kg of water is evenly sprayed inside, and all doors, windows, and vents are sealed. The fan is then turned on for about 2.5 hours to distribute the moisture evenly. Another method is "borrowing the tide," also known as natural resurfacing. This involves taking advantage of the higher relative humidity in the environment, typically during the early evening to early morning. Once the temperature in the barn has dropped slightly below the outside temperature, the doors and vents are opened to allow the leaves to absorb moisture from the air. The process continues until the leaves are slightly softened, at which point they are carefully removed. This method is convenient and requires no special equipment, but it depends on local weather conditions, which can affect the speed and effectiveness of the process. A third method involves using a "tide room," a specially designed structure for resurfacing. Similar in design to a regular building, it includes doors and windows to maintain humidity. The process involves removing soot from the barn and placing the tobacco on shelves or spreading it on the floor. As the leaves gradually regain moisture, the doors and windows are closed tightly. If the air is too dry, water can be sprinkled on the floor to increase humidity. This method is not affected by external weather conditions, improves the efficiency of the barn, and results in more uniform rehydration with fewer broken leaves. No matter which method is used, it's important to monitor the process closely. Resurfacing should not cause the leaves to break, and the main veins should remain intact. Ideally, the moisture content should be around 13% after the process is complete. With proper care and attention, the quality and value of the tobacco can be preserved effectively.

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