How to solve the bag break rate of a soft bag factory up to 45%?

October 09, 2018

[China Packaging Network News] A soft package factory processing NY // CPP cooking packaging, the bag breaking rate is as high as 45%, and later found the reason and found a solution with the help of the ink factory. This method of using the exclusion method to find out the real problem is worthy of reference in the industry. The problem has arisen: up to 45% steamed bags and broken bags The industry encountered such a problem: Before receiving the customer in Guangdong, he reported that using our company has a high bag breaking rate (up to 45%) for the cooking ink and retort resistance of processing NY // CPP cooking package. The same phenomenon can also occur with other brands of resistant cooking adhesives. The manufacturer sends the bag and some materials. Please check what caused it. Reason for inspection: determine the bagging problem caused during heat sealing By inspecting the packaging bag, it was found that the packaging bag had the quality problem of heat sealing. The packaging bag was heat-sealed by hand, the heat sealing strength was not very good, the heat sealing edge was particularly poor at 1 to 2 mm, and the heat sealing between CPP and CPP could be very good. Easy to pull apart, but the composite strength of NY / CPP can not be peeled off. At the same time, it was placed in a bag by hand and the edges of the CPP and CPP were heat sealed. Therefore, we believe that there is a problem with the heat sealing process. Reason for elimination: Exclude one by one according to factors affecting the heat seal process 1. The type, thickness and quality of the heat seal layer material have a decisive influence on the heat seal strength. Typical heat sealing materials commonly used in composite packaging include CPE, CPP, EVA, hot melt adhesives and other ionic resins coextruded or blended modified films. The thickness of the heat seal layer material is usually between 20 and 80 μm, and in special cases is as high as 100 to 200 μm. For the same type of heat seal material, the heat seal strength increases with the heat seal thickness. The heat seal strength of the cooking bag typically needs to be 40-50N. Therefore, the thickness of the heat seal material should be 60-80 μm or more. 2. The heat sealing temperature has the most direct influence on the heat seal strength. The melting temperature of the various materials directly determines the minimum sealing temperature of the composite bag. In the production process, the heat sealing temperature actually used is generally higher than the melting temperature of the heat sealing material due to the effects of heat sealing pressure, bag making speed and thickness of the composite substrate. The smaller the heat sealing pressure, the higher the heat sealing temperature; the faster the machine speed, the thicker the surface material of the composite film, and the higher the heat sealing temperature required. If the heat sealing temperature is lower than the softening point of the heat sealing material, it is impossible to completely seal the heat sealing layer anyway by increasing the pressure or prolonging the heat sealing time. However, if the heat sealing temperature is too high, it is easy to damage the heat sealing material of the welded edge and melt and extrude, resulting in "root cutting" phenomenon, which greatly reduces the heat sealing strength and impact resistance of the sealing bag.

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