High-temperature cooking bags are resistant to retort compound inks in use. If the operation is not careful, it may affect the printing and compound quality. Therefore, the flexible packaging must pay attention to the following points before use.
1. The printing ink should pay attention to distinguish between ordinary cooking-resistant type, high temperature-resistant cooking type and ultra-high temperature-resistant cooking type, and select according to actual needs.
2. It is best to conduct a confirmation test before using the retort-resistant composite ink, especially the compatibility of the retort-resistant composite ink with BOPA film, and the compatibility of the retort-resistant composite ink with the compound adhesive, so as not to affect the printing and compound quality . For example, the resin used in the retort-resistant composite ink has similar performance as the main component of the two-component polyurethane adhesive. Due to the different reactivity of the curing agent in different types of adhesives, there is a large difference in the remaining amount of use. When the printed pattern is compatible, the composite packaging bag may wrinkle or delaminate after cooking.
3. If the ink has poor cooking resistance, the color will change or fade after high temperature cooking. In addition, when using red-based retort compound inks (such as pink, magenta, or pink hues) to print high-temperature retort packaging bags with BOPA film as the outer material, color penetration often occurs, causing serious Quality accident.
4. The pattern design of the steaming packaging bag should be simple and the color number should not be too much. If using the inner printing method, considering the composite strength and heat seal strength of the subsequent process, try to avoid full-page printing when designing the manuscript, especially the heat-sealing part of the packaging bag should be designed to be transparent, without printing the pattern.
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