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Reasons and countermeasures for broken bags of cooking bags

by:Supouches Packaging     2022-07-29
Due to its light weight, small size, fast heat conduction, short sterilization time, and better retention of the color and aroma of the contents, the retort bag has gradually replaced some iron cans and glass cans, but due to the many properties of its packaging materials , sterilization and other processes have a greater impact, so there is a potential risk of bag breakage. 1. Substrate problem The retort bag is heated together with the product, which determines that the surface material of the retort bag has very good stability after cooking, especially the dimensional stability after cooking and cooling. If the thermal stability of the substrate Not good, it is easy to break the bag after cooking, cooling and shrinking. Countermeasures: Retort bags are generally made of PET, NY, AL, RCPP and other substrates with better high temperature resistance. Pay attention to the shelf life of various substrates, especially the shelf life of RCPP, because RCPP is used as the inner layer material for high temperature cooking. , plays a central role in the performance of the cooking bag. If the quality of RCPP is relatively poor or has expired, it will be brittle and rupture to a large extent when it is compressed after cooking and cooling. 2. The influence of the bag making process The temperature, pressure and machine speed of the heat sealing knife are the three major elements of the retort bag making process. In order to make a bag with good sealing performance, a reasonable match of the three is required. Countermeasures: Due to the high requirements of the use environment, the retort bag is generally required to have strong heat sealing strength. When making retort bags, special attention should be paid to the point sealing of the junction between the bottom and the bag body, because under the cooking conditions, with the shrinkage of the material, the junction will become the focus of moisture and heat attack. The number of heat-sealing times greatly affects the heat-sealing strength. Reasonable setting of the number of horizontal and vertical seals during bag making can well ensure that each sealing edge has a good heat-sealing strength. At the same time, attention should be paid to the cooling after heat sealing. During cooling, under a certain pressure, use a lower temperature to shape the position just melted and heat sealed to eliminate stress concentration.
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