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What is the reason for the heat sealing and delamination of the packaging film?

What is the reason for the heat sealing and delamination of the packaging film? The general reasons for the heat-sealing and separation of the packaging film are as follows: 1. The choice of the adhesive is wrong or the heat resistance of the adhesive is poor. 2. The ratio of curing agent is out of balance. The possible reasons for the imbalance of the curing agent ratio are: a. Human-made ratio errors; b. The ambient temperature is too high; c. The solvent contains water, alcohol or active-OH gene; d. The container in the ink is not fully dried . 3. Insufficient curing or too low temperature. 4. Insufficient drying. Since the solvent does not volatilize cleanly during printing or compounding, there are many residual solvents. Although these solvents may not have active ammonia and will not affect the cross-linking reaction of the adhesive, the adhesive layer will swell due to the solvent, and at high temperature Vaporization may occur, so although it has little effect on the composite strength at room temperature, it may cause heat seal delamination. 5. The influence of printing ink. One is that the non-volatile active solvent in the ink, the resin or the additive in the ink consumes a part of the curing agent, which causes the imbalance between the main agent of the adhesive and the curing agent, resulting in the heat-sealing separation layer. The second is that the heat resistance of the ink layer of the ink itself is not good, and the ink layer is damaged during heat sealing, causing the heat seal to separate from the layer. Heat-sealing delamination may occur when heat-labile polyester amine inks or ammoniated polypropylene inks are used for high-temperature heat-sealing applications. More packaging film knowledge: Customized packaging film roll film

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