The medicinal blister aluminum foil is made of pure aluminum foil commonly used in the industry. It will be printed on its surface and coated with a protective agent. The other side will be attached with an adhesive, and it can also be printed before coating. The general purpose of the protective agent is to prevent the abrasion of the ink layer on the surface of the medicinal blister. This ink layer has a good insulation effect. The role of the adhesive is to seal and connect the rigid sheet and the aluminum foil. Medicinal blister has a very important relationship with human health, so aluminum foil protective agent also requires good adhesion and flexibility, the surface must be transparent, have good gloss, and have high abrasion resistance.

Most of the protective agents used by many pharmaceutical manufacturers are solvent-based, consisting of nitrocellulose, synthetic resins, plasticizers, cosolvents, diluents, etc., which are mixed in a fixed ratio and stirred in the reactor to form a solvent, Then a protective film will be produced on the outer surface of the aluminum foil blister. As for the aluminum foil adhesive, it is composed of a polymer compound and is also a composite solvent, which needs to be able to meet the heat bonding strength of the aluminum foil and the plastic rigid sheet after hot pressing.

The application of medicinal blister aluminum foil adhesive was initially made with pressure-sensitive adhesive for adhesives, the main component is natural rubber or synthetic rubber, and a certain ratio of acrylic resin mixed with a solvent. Another material used for pharmaceutical blister packaging is polyvinyl chloride plastic sheet: polyvinyl chloride, also known as PVC, is produced by the production method of extrusion or calendering of the main resin formed by the polymerization of vinyl chloride monomer and other mixtures. Almost all of the medicinal PVC rigid sheets we often see are calendered production processes.

The main component of the one-component sole is natural rubber or synthetic rubber in combination with other substances. Since the main agent is an elastomer, the proportioning thickener is used as an auxiliary agent, and the mixture is mixed to form an emulsion through the stirring reaction in the reactor. It is made into an emulsion with an organic solvent, which has non-drying property, hot-melt property and certain adhesive strength. And as people pay attention to the safety of essential supplies in the past few years. The sanitary requirements of pharmaceutical packaging materials are also more stringent. The application field of this one-component adhesive is gradually decreasing. More two-component polyurethane adhesives are used in the market, which is mainly composed of the main agent and a curing agent.

Medicinal aluminum foil has a certain adhesive strength after being coated, and it is thermally bonded with PVC after dry coating and has good heat sealability. Now this method has been widely used in production. As the requirements for sanitation and sealing performance of pharmaceutical packaging materials increase, the trend of using two-component adhesives will become increasingly obvious. It is conducive to environmental protection and can also save equipment investment costs.