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Why can’t the vacuum effect be maintained after using the vacuum sealer? The following are possible reasons. Users can check by themselves first.   1. The wrong material of packing bags: the material of plastic bags is PE, PP which can’t maintain the vacuum effect. The air will enter into the bags after the vacuum sealer finishing working. It is recommended to choose Nylon bags, Aluminum foil bags which can maintain the vacuum effect for a long time.   2. The sealing line is not sealed well: please check whether the sealing line is complete or not. If the sealing line is not closed, the air will run into the bags. (1) If the bag is too thick, and the vacuum sealer wasn't set for enough sealing time, the heat wasn't enough to seal the bag. If the vacuum sealer can adjust the sealing time, users can add more seconds to test whether the sealing is firm. If the vacuum sealer can't adjust the sealing time, users may need to replace the thinner bag or buy another vacuum sealer with setting sealing time function.     (2) There have also been cases where the bottom seal of the original bag was not sealed properly. In this case, seal the bottom sealing line again before vacuuming.   3.     Vacuum bag styles are not suitable for vacuum sealers: non-nozzle vacuum sealers can't be used for vacuum flat bags. Therefore, if you buy a non-nozzle vacuum sealer, you must pay attention to the style of the bag you use. This vacuum sealer is a must-to-use vacuum embossed bag or Nylon gusset vacuum bag. It is recommended that when purchasing a vacuum sealing machine or vacuum bag, it is more appropriate to confirm with the supplier first.     4.     The vacuum bag is broken: (1) If the package article has acute angles, be careful not to cut the vacuum bag when putting it into the vacuum bag. (2) Vacuum sealer in the process of pumping, when the bag is shrunk to the package, it may be punctured by the packaging.

Vacuum Packaging in Agricultural Product Processing: Extending Freshness and Enhancing Quality   In the agricultural product processing industry, one of the key challenges is preserving the freshness of ingredients, extending shelf life, and enhancing product quality. With the advancement of vacuum packaging technology, more and more agricultural product processing factories are adopting this technique, achieving remarkable results. Vacuum packaging not only effectively extends the shelf life of agricultural products but also protects their nutrients and original flavors. Below are the main applications of vacuum packaging in agricultural product processing:   1. Extending the Freshness of Agricultural Products For fresh vegetables, fruits, meat, and seafood, maintaining freshness after processing is a critical concern for processing factories. Vacuum packaging effectively isolates air, reducing the exposure of ingredients to oxygen, which helps slow down oxidation and prevent spoilage. This not only extends the freshness of agricultural products but also ensures that their taste and nutrients are preserved, meeting consumer demand for fresh products.   2. Optimal Storage for Frozen Foods Frozen agricultural products, such as frozen vegetables, fruits, and meats, are common products in many processing factories. Using vacuum packaging can effectively prevent freezer burn, preserving the texture and nutritional value of the food. Vacuum sealing reduces moisture loss, maintains the color, taste, and texture of the product, ensuring it remains in optimal condition even after long storage, making it suitable for distribution and sales.   3. Preservation of Dry Goods and Dried Fruits Dry fruits, dried vegetables, and other dry goods play an important role in agricultural product processing. The preservation of these products heavily relies on vacuum packaging, which effectively prevents moisture and insect infestation, protecting the taste, aroma, and nutritional value. Whether it's nuts, dried fruits, or herbs, vacuum packaging extends shelf life, reducing losses caused by environmental factors.                4. Meeting the Demand for Ready-to-Eat Agricultural Products As consumer demand for convenient foods rises, many agricultural product processing factories have begun producing ready-to-eat agricultural products. These products, such as pre-packaged salad greens and frozen ready-to-eat meals, benefit from vacuum packaging, which helps retain freshness and nutrients. Vacuum packaging not only maintains the taste and texture of the products but also enhances their market competitiveness, meeting consumers’ desires for both health and convenience.   5. Seed Packaging and Protection Agricultural product processing factories are not only concerned with food processing but also the handling of agricultural seeds. Seed packaging requires sealing to maintain dryness, prevent moisture, and protect the seeds from environmental factors. Vacuum packaging plays a significant role in seed packaging, improving germination rates and ensuring the productivity of crops.   Conclusion Vacuum packaging technology in agricultural product processing has a wide range of applications, from preserving freshness, freezing, and dry goods storage to meeting the demand for ready-to-eat products. It plays a vital role in extending shelf life, protecting the flavor of ingredients, and enhancing market competitiveness. As the need for diverse agricultural products and high-quality food grows, vacuum packaging continues to be an essential technology for agricultural processing.

Q&A How to make the sealing line of the impulse sealer even and beautiful?   Q: Users often want to know why the sealing line is crooked and thin, rather than the flat and complete 2mm or 5mm wide sealing line tested by the manufacturer. A: The key point is cooling time. For impulse sealers, whether hand type or foot-operated type, both the sealing and cooling time are manually controlled. In order to shorten the package time, many users will ignore the cooling time directly. As soon as the heating time is up and the heating light goes off, they release the handle or foot pedal. This will result in uneven sealing lines.   Q: How long does the cooling time need to be? A: It is recommended to refer to the sealing time. If the heating time is longer, the cooling time should be increased accordingly, but not necessarily in a proportional manner. It still needs to be tested. Based on the experience, if using regular bags and the sealing time is not set for a long time, it is recommended that customers press for an additional 1 second after the heating light goes off (the editor usually counts to 3 in their mind) before releasing the handle or foot pedal.   Q: If I don't care about the appearance of the sealing line, can I ignore the cooling time? A: It is still recommended to have some cooling time. A complete sealing line is not only visually appealing to customers, but the most important, it ensures the bag is securely sealed. The impulse sealer uses heat to stick the bag mouth and seal it tightly, and then cools the sealing line by pressing the bag. This is how the sealing line can be both firm and smooth. Without cooling time to cool the sealing line, the sealing line of the bag mouth may be thin and easily melt and break, which could lead to bag rupture and increase the workload instead.