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Cooking bag curing process and matters needing attention

by:Supouches Packaging     2022-07-29
The purpose of the cooking bag curing is to promote the chemical reaction between the main agent and the curing agent of the two-component polyurethane adhesive, so that the molecules form a network cross-linked structure, so as to have a higher composite firmness. Therefore, the two important factors of aging - time and temperature are indispensable. The packaging bag manufacturer's cooking bag curing, whether external heating or internal heating is used, is aimed at achieving a stable and uniform indoor temperature. Because the composite films of different material structures have different curing requirements, the composite adhesive can achieve higher bond strength only by forming a network structure. Therefore, in order to consider thoroughly, generally ordinary two-component adhesives can be completely cross-linked after 24 hours at 45-55 °C. The retort adhesive composite film needs to be cured at low temperature for a long time, and the retort bag adhesive will take 72 hours to be completely cross-linked and cured. During the curing process of the cooking bag, the adhesive still has a certain fluidity, so the effect of hanging curing is better. But some adhesives require 15-7 days. This point must be done according to the requirements of the product manuals of various brands and models. The room temperature cannot be too low and the curing time is too short. The temperature in the cooking bag curing room should be maintained at all points by means of ventilation and flow. Therefore, while strictly controlling the cooking time and temperature of the cooking bag, the exhaust fan should be turned on regularly, and the indoor air should be properly replaced. The residual solvent released during curing is discharged to the outside to replenish clean and refreshing fresh air to avoid secondary pollution of the composite membrane, so as to facilitate the circulation of fresh air in the curing room. This is beneficial to reduce the residual solvent content and peculiar smell of the compound, and is beneficial to improve product quality. The curing temperature of the cooking bag is generally controlled within a deviation of 2 °C, and the deviation of the curing time is only +4h. It is not advisable for the curing time to be insufficient or too long. After the cooking bag is cured, the material should be left to cool at room temperature for 24 hours before it can be cut into bags. According to operating experience, if a retort bag product cannot be fully cured at one time, the peeling force of secondary curing is much worse than that of primary curing, and it is also easy to delaminate and lead to high temperature cooking.
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