1. Curled edge sealing
The sealing formed by bending and hooking the edges of the can cover and the flange of the can body together is called a rolled edge sealing. The cylindrical metal cans widely used in canned food and beverage packaging are sealed using this method. To prevent air leakage at the joint of the seal, a glue solution (made of rubber or tree material) is generally applied to the concave edge of the lid, which is then curled and sandwiched in the seam to enhance air tightness.
2. Gland sealing
The seal formed by the corrugation around the crown shaped round cap and the bite of the bottle mouth flange is called a capping seal. This type of sealing is achieved by lining an elastic sealing gasket made of rubber or cork between the bottle cap and the end face of the bottle mouth for sealing. The pressure cap sealing is reliable and easy to open, making it a common sealing method for glass bottle containers containing carbonated liquid beverages such as beer, soda, and alcoholic beverages.
3. Compression sealing
The method of tightly sealing the bottle mouth by the elastic deformation of the cork pressed into the bottle mouth is called cork sealing. Bottle stoppers are commonly made of materials with certain elasticity, such as cork, rubber, and plastic, and their structures and shapes vary, revealing their common shapes.
The bottle cap seal can be used for both direct sealing and combined sealing with the bottle cap. To improve product sealing and extend shelf life. Direct sealing is commonly used for sealing liquid foods such as bottled soy sauce and vinegar, while combination sealing is commonly used for sealing high-end bottled wines, medicines, and toxic products.