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What is the effect of composite structure on heat seal quality?

What is the effect of composite structure on heat seal quality? The heat temperature of the composite film is determined by the heat sealing temperature of the heat sealing material, but it should be noted that the heat sealing temperature cannot exceed the heat setting temperature of the composite film, otherwise the heat setting of the biaxially oriented film will be destroyed, causing the packaging bag to shrink after heat sealing. wrinkle. For example, the packaging bag of BOPP/CPP structure has excellent transparency and rigidity, and is widely used in food packaging. However, the heat setting temperature of BOPP is very close to the heat sealing temperature of CPP, and it is easy to cause the heat setting temperature of BOPP to be very close to that of CPP during heat sealing. The heat-sealed part is brittle and broken. Therefore, when designing, it is necessary to pay attention to the thickness of BOPP film that is close to or greater than that of CPP, or change the vertical printing layout to horizontal printing layout to reduce the necking phenomenon at the horizontal seal, or use low-temperature CPP to reduce the heat sealing temperature. Make the heat-sealing part flat and wrinkle-free. For more bag questions, please visit: www.yltpacking.com

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