Flat vs. Side Wall Sealing Aluminum Caps for Medical Vials

Sealing principle of aluminum cap

According to the sealing principle of aluminum cap bottle cap, it can be divided into flat pressure sealing and side wall sealing. Flat pressure sealing can only be used in screw caps. When tightened, the contact surface of the Russian sealing ring between the bottle mouth plane and the inner plane of the bottle cap increases, thereby achieving a sealing effect.

Side wall sealing uses the effective contact between the bottle mouth memory and the outer side of the bottle cap sealing system to achieve the sealing effect. The screw cap with the side wall sealing system should be a common pattern cap solution. For injection glass caps, it is often a metal cap combined with a rubber stopper, which requires design and selection based on the structure, purpose and price of the product.

In the case of specifying the specifications of the aluminum cap, saline bottles of different calibers should be selected and the appropriate bottle cap should be selected. The shape of the aluminum cap is generally flat top, and the shape after pressing depends on the capping mold of the capping machine. If the mother and child and the flat top are sealed into an aluminum cap flat top shape, they often cannot fit tightly with the bottle stopper and are prone to loosening. (