Oral liquid aluminum caps have plastic caps and aluminum caps in terms of material, as well as integrated caps based on plastic materials in terms of function. The so-called “integration” refers to the way in which the required monomer functions are organically and effectively integrated into the unity through different combinations as needed.

The mouth of the oral liquid aluminum cap and the bottle cap constitute the sealing system of the bottle. In addition to the raw materials used in the bottle and the wall permeability of the bottle itself, the sealing of the bottle cap directly affects the quality of the contents of the bottle. According to the locking method of the aluminum cap of oral liquid, the bottle cap can be divided into threaded cap and first pressed cap.The threaded cap uses a threaded locking method. The cap and the bottle body fall firmly, and the thrust is large, but from the appearance, it is impossible to judge whether it is tightened. First press the cap to visually see whether it is fastened to the bottle body, but its thrust is small, easy to leak, and not easy to hold liquid.

According to the sealing principle of the 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 screw sealing ring between the plane of the bottle mouth and the inner plane of the bottle cap increases, thereby achieving a sealing effect.The side wall sealing uses the effective contact between the inside of the bottle mouth and the outside of the bottle cap sealing system to achieve the sealing effect.Screw caps with sidewall sealing system should be the preferred solution for ordinary screw caps.For injection glass caps, metal caps are often combined with rubber plugs, which need to be designed and selected according to the structure and use of the product and the price.