High temperature cooking bags abscission layer and broken bag is going on?

Qualified high temperature cooking bags means that can resist high-temperature cooking, not destroyed, structure composition is changeless, hardness is the same. But in the process of production, due to various reasons, hard to avoid can appear like bags, delamination of the question. Torn bags and delamination phenomenon is easy to confuse, here need to distinguish between: broken bag generally refers to the film or heat sealing side strength is not enough, such as cooking or resistance to low temperature resistance of the CPP film, heat sealing produced when & other; Root cutting & throughout; Such as, composite bags will be broken and air leakage. Ordinary CPP film of heat resistant performance are good, when choosing the lining of the retort pouch of CPP film, must choose cooking level of polypropylene film, namely RCPP. Because of the outstanding RCPP film boiling resistance, mainly displays in the heated remains toughness, but also a good low temperature resistance. Market high-grade cooking CPP is mitsui, Japan toray company's products, such as delamination phenomenon: OPA membrane is separated from the CPP film, packaging bags have not been flat. Look carefully, the printing ink of abscission layer after layer, we pass to analyze delamination phenomenon is divided into two types: the first is to keep most of the ink layer on the nylon membrane, can be understood as ink and adhesive layer from or adhesive layer out of retort pouch lining CPP film. This happens first examine whether the adhesive curing completely, and the inner surface treatment effect of the CPP film, glue, etc. Township used to make the right guy bag of CPP film surface corona must reach more than 38 dyne, place the CPP film is not available for too long, can appear otherwise the delamination phenomenon; The second is the vast majority of transfer printing ink layer to retort pouch lining on the CPP film, the delamination can be understood as OPA from film and ink layer. When this happens, first consider the quality of the OPA membrane, printing ink features and printing, and glue and ink compatibility. Nylon membrane be affected with damp be affected with damp or corona is not good, will affect the ink adhesion fastness, under the printing film machine, available pressure sensitive adhesive fastness test ink layer. Polyurethane ink connection part contained more lively sex groups, easy to react with curing agent, and the adhesive had good affinity. When the glue quantity is too large, or the amount of residual solvents in the ink layer is large, the possibility of ink transferred to the lining of the CPP film layer increases. Aiming at this problem, for printing ink viscosity is low, as far as possible to reduce residual solvents, composite increases when the dosage of the curing agent.