Aluminum foil printing for pharmaceutical packaging its brief process flow is:
Aluminum foil uncoiling → gravure printing → drying → coating protective layer → drying → coating adhesive layer → drying → aluminum foil winding.
Throughout the production process, the surface quality of gravure printing text patterns and adhesive layer to achieve the heat sealing strength, the adhesion of the protective layer and its temperature in the drying and coating machinery running speed, tension control, is the process of operation needs to be strictly grasped.
Therefore, in the national standard of "Aluminum Foil for Pharmaceutical Packaging", there are clear requirements on the surface quality of the printed text of pharmaceutical aluminum foil, and there are physical and chemical indexes on the performance of the protective layer and the adhesive layer, so as to protect the pharmaceutical PTP aluminum foil with better barrier property, health and safety, heat sealing and good physical and mechanical properties. To PTP aluminum foil printing and coating production process to achieve the above requirements of the performance, but also need to be familiar with the performance of the raw materials applied, and in the process of operation should pay attention to the following issues:
First, grasp the characteristics of aluminum foil and printing ink
Production of PTP aluminum foil used as raw materials for industrial use of pure aluminum foil, general requirements for the thickness of 0.02mm, tensile strength of 98kPa, rupture strength of 90kPa, the surface is clean, smooth, no wrinkles, no indentation damage, no flakes of fluorescent material, the surface of the wettable tension is not less than 32.
the pinhole degree of the pharmaceutical aluminum foil is required to be 0.1-0.3mm in diameter. The requirement of pinhole degree for pharmaceutical aluminum foil is 0.1-0.3mm in diameter, no more than 1 pinhole/m2. Since pinhole in aluminum foil is a penetrating defect, the medicine will be invaded by oxygen, water vapor and light to reduce the efficacy of the medicine or deterioration, so the requirement of pinhole degree is very strict; in addition, the thickness of the aluminum foil will be affected on the coating amount of adhesive layer and protective layer if it exceeds the required deviation (10%), which needs to draw the attention of the operator.
*** Translated with www.DeepL.com/Translator (free version) ***