Aluminum foil packaging bags are used more in electronic packaging bags and cooking bags. How to make an aluminum foil bag that can satisfy customers and pass the quality standard? The following by the small braid with you from the material to solve the problem for you. [aluminum foil packaging bag]
At present, the cooking temperature in the market is above 121 ℃ (inclusive). The high temperature cooking packaging containing aluminum foil mainly has the following two material structures, namely BOPET / Al / rcpp and BOPET / Al / BOPA / rcpp. The following author focuses on the analysis of these two structures, and to discuss with you, hoping to do a good job in this kind of packaging.

BOPET is a kind of high-grade plastic film with excellent properties, which is produced by biaxial stretching with PET chips as raw materials. It has high transparency, non-toxic and tasteless, high tensile strength, good stiffness, tear resistance, non-destructive, excellent electrical and optical properties, good oxygen resistance, moisture resistance, cold resistance (- 70 ℃), heat resistance (200 ℃), and chemical corrosion resistance And good properties of stable shrinkage. When selecting BOPET, the heat shrinkage should be less than 2% in longitudinal direction and 1.5% in transverse direction at 150 ℃ for 30 min, and the surface tension should not be less than 45MN / m.

Aluminum foil is the only metal foil in flexible packaging materials, which has a long application time in packaging field. Aluminum foil is a kind of metal material. Its water resistance, gas resistance, light shielding and taste retention are difficult to be achieved by any other packaging materials, and they can not be completely replaced. Aluminum foil is made of electrolytic aluminum with 99.0% ~ 99.97% purity after multiple calendering. It is rich in resources and has considerable advantages in performance price ratio. The aluminum foil for cooking packaging should be grade a soft aluminum foil with thickness of 9 μ M.
BOPA film has high puncture resistance, impact strength, friction strength and bending strength, and has good barrier property. When we use BOPA film, we should pay attention to the characteristics that it is easily affected by moisture and water absorption deformation. As the material of the intermediate layer, double-sided corona treatment is required, and the surface tension is not less than 50Mn / m. some customers use BOPA with single side treatment for lamination. The strength of the composite will be much lower, and increasing the amount of glue on the non treated surface will make up for it.
The characteristics of rcpp film are transparency, good flatness, good temperature resistance, certain stiffness, flexibility, and good heat sealing property. When making rcpp with aluminum foil packaging, attention should be paid to the heat shrinkage rate not to be too large, and the selection should take into account the different contents and have certain pertinence, especially when making some materials containing grease and acid and alkali 。 It is suggested that the thickness of cooking CPP should not be less than 80 microns, and the supplier with good physical control should be selected. For the special requirements of the contents, the corresponding products should be selected.
Special attention should be paid to the selection of ink for cooking and packaging. The double liquid polyurethane ink with good temperature resistance must be added with curing agent. Otherwise, the free hydroxyl in the ink will consume part of the curing agent, resulting in insufficient curing agent and main agent reaction, so that the adhesive layer can not be completely cured. After cooking, the peeling strength is low and the adhesive layer is back sticky; when it is serious, the ink layer and aluminum foil layer will appear, which will affect the appearance and barrier performance of the packaging.