Why does the heat-sealed part of the meat product packaging bag leak?

Quality problem: Liquid leakage occurs in the heat-sealed part of the meat product packaging bag with a lot of liquid content. Reason analysis: (1) The heat sealing performance of packaging materials is poor-in the packaging process of meat products, small particles such as liquid droplets or meat product ingredients fragments often stick to the heat seal. If it is used as the heat seal layer of the packaging bag Inappropriate selection of the film material, heat-sealing regardless of the inclusion of fine particles, the heat-sealing strength is easy to reduce. The sealing performance becomes poor, and it is squeezed by external force or stored for a long time, and liquid leakage is easy to occur. It can be verified by testing the heat-sealing strength of finished packaging bags and empty packaging with no contents. (2) The heat sealing performance of the finished product packaging production process is poor. If the parameters of the heat sealing equipment are not set properly, the sealing quality of the heat sealing part will be poor, and the phenomenon of poor heat sealing or excessive heat sealing will easily cause hot air to escape. There is a leak. Expert advice: ——Pay attention to the daily inspection of the main performance of the package, such as the heat-sealing strength (empty packaging bag), heat-sealing strength (finished packaging bag), and sealing performance (negative pressure method). ——Choose a packaging material with good heat sealability that is resistant to inclusions (that is, when the heat seal has particles, droplets, powder, etc., it still has good heat sealability), or appropriately increase the thickness of the heat seal layer material— —Adjust the heat-sealing process parameters to avoid small particles sticking to the heat-sealed part and ensure that the heat-sealed part has a good heat-sealing quality. Typical quality cases: ——Test sample: Chicken feet packaging bag| (Customers report that the finished product packaging is leaking at the heat seal of the packaging bag during the transportation or sales process) ——Targeted testing items: sealing performance (negative pressure method), Heat-sealing strength (packaging of finished product) ——Test result: In the test of sealing performance (negative pressure method), the finished product of chicken feet is packed at -80kpa (because the product adopts vacuum packaging, the pressure when leakage occurs is higher than that of ordinary packaging. High), air leakage occurs at the heat seal; the uniformity of the heat seal strength of the finished package is poor, the heat seal strength of a good seal can reach 55N/15mm, and the heat seal strength of the poorly sealed place is only 13N/15mm. Therefore, the poor sealing uniformity of the heat-sealed portion of the bag is an important reason for the leakage of the heat-sealed port.
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