Several common flexible packaging quality problems

1. Aluminized transfer Common aluminized CPP and aluminized PET. Aluminized transfer usually appears on aluminized PET because it is often used in the middle layer composite. There are two types of aluminum-plated PET: one is plated aluminum, and the other is transferred aluminum. The effect and adhesion of the two types of aluminum plating are different. The plating is better, and many of the transferred products are reprocessed and transferred from poorly purchased PET by the company, which has poor adhesion. This is because the peel strength of the film itself is too low, and the bonding strength between the aluminum coating and the base film is relatively poor. The normal aluminized film has a layer of primer on the vacuum aluminized surface of the substrate to improve the adhesion of the aluminized layer, and then vacuum aluminize on the primer, and then coat the aluminum layer with a double set Polyurethane glue is used as the top coating to protect the aluminum-plated layer from falling off. The aluminum-plated layer of this aluminized film has good firmness and is not easy to fall off. In order to save production costs, some aluminized film manufacturers do not use primer when producing aluminized film. The aluminized film has low adhesion and is not very strong, so it is easy to fall off. Therefore, plastic bag factories and enterprises should pay attention to the difference when purchasing materials. Another factor that may cause the transfer of aluminum plating is that after pulling it apart, it is found that there is aluminum on both sides of the aluminum plating and the substrate. Obviously, this shows that the film has undergone secondary aluminum plating, which is the material manufacturer for some reason. The film was aluminum-plated twice, and aluminum-plating transfer occurred. Another factor that triggers the transfer of aluminum plating is the cause of glue. Ordinary glue is relatively small in molecular mass and has strong activity. It is easy to penetrate into the aluminum plating and affect the adhesion of the aluminum plating, and the aluminum plating transfer occurs. At the same time, the current solvent volatilization ability is poor, and the glue can easily penetrate into the aluminum coating and damage the aluminum coating. Due to the residual solvent after curing, the bonding strength will decrease, which will affect the peel strength and cause aluminum coating. Transfer. The solution of most manufacturers is to reduce the addition of curing agent. This has changed the effect of aluminum plating transfer, but it is not a cure for the symptoms. As the weather changes and the temperature and humidity of the workshop change, it is difficult to control the amount of curing agent, which may cause the problem of batch production of defective products. Because most of the compounding problems need to be cured before knowing how to deal with it. After curing, it is discovered that it is too late. So I don't recommend using this program frequently. In terms of glue, I suggest choosing an adhesive with a moderate molecular weight, a relatively uniform molecular weight distribution, and a low initial tack. The characteristics of the water-based glue can meet the above requirements. The molecular weight of the water-based adhesive is about 10 times that of the solvent-based adhesive, and the molecular weight distribution is relatively uniform. There is no possibility of damage to the aluminum coating due to solvent penetration, so it will not affect the adhesion fastness of the aluminum layer, and it will not cause Aluminized transfer. Water-based adhesives are currently widely used in aluminum-plated packaging. For example, Shanghai Longhong's two-component water-based 268 and Rohm and Haas's one-component water-based 90D have unique advantages in this regard. Therefore, the choice of adhesive is very important in solving the problem of aluminized film transfer. Another reason for the transfer of aluminum plating is improper operation by the technicians. The improper operation method is manifested in the following aspects: · Excessive operating tension will strain the aluminized film, resulting in elastic changes, resulting in transfer; · Excessive amount of glue can lead to non-volatile, false drying, and solvent residues leading to transfer; ·Excessive residual solvent will damage the aluminum plating, because the aluminum plating layer of the aluminum plating film is relatively thin, it is inevitable that there will be some pinholes, so that the residual solvent will penetrate in, destroy the aluminum layer and cause the aluminum plating transfer; the above is about the aluminum plating transfer According to some analysis, I personally think that reducing the amount of curing agent is not advisable. Companies can choose enhanced aluminum plating or plated aluminum to solve this problem. Don’t use transferred aluminum plating and secondary aluminum plating. Material. 2. Retort Packaging Bags There are many kinds of retort problems, the common ones are delamination, wrinkling, swelling, air leakage, peculiar smell and other problems. 1. Delamination Delamination is the phenomenon of material delamination after the packaging has been sterilized at 121°C. Usually nylon compound high temperature CPP, the material and ink glue must be high temperature. Pay attention to the amount of glue in the operation to solve this problem. 2. Wrinkles Many companies find that it is good to take the product out of the drying room. After the bag is made, they find that the edge of the bag is wrinkled. This is typically caused by insufficient curing time. After the bag is cooled, you will find wrinkles at the sealing edge, so it should be immediately returned to the curing room for curing.
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