Factors pharmaceutical packaging aluminum foil sealing strength of mainly the following aspects

Terms of raw material

Primary aluminum is the carrier of the adhesive layer, and its quality has a great influence on the heat seal strength of the product. In particular, the original aluminum foil surface oil, it will weaken the adhesive force between the adhesive and the original aluminum foil. If the original aluminum surface and the surface tension of the oil is less than 31 × 10-3μm time, it is difficult to achieve the desired heat seal strength, and therefore must strictly to good quality primary aluminum.

Adhesive aspects

The binder is a special substance containing the solvent, which under certain conditions, the coated aluminum foil in the original dark side (or smooth), after drying drying tunnel forming an adhesive layer, heat seal strength of the product plays a decisive effect. Adhesive on the color can be divided into colorless, transparent, gold and color series, can be selected according to the needs of users. Different components of the adhesive, heat seal strength of the final product is different

Production processes

Under certain process parameter control, so that the adhesive applied to the surface of aluminum foil in the original filming, filming will directly affect the quality of heat seal strength of the product. One of the more important parameters include the coating speed, location segments bake temperature coating roll A pattern shape, depth, number of lines and the blade angle.

Sealing temperature

Sealing temperature is an important factor affecting heat seal strength. Temperature is too low, the adhesive layer is not well with PVC film heat sealing, adhesive PVC film with an adhesive layer between the will is not strong. If the temperature is too high, but also make the drug affected. Therefore, it is reasonable sealing temperature is generally between 150 ℃ ~ 160 ℃.

Sealing pressure

To achieve the desired heat seal strength, we must set a certain sealing pressure. If the pressure is insufficient, not only can not make the product an adhesive layer and a PVC film fully bonded sealing, even make bubbles remain between the two, reach a good sealing effect. So the national standard specifies the sealing pressure of 0.2 × 10Pa.