1. Mold design and size adaptation
Mold design plays a key role in the adaptation of plastic bottle caps to bottles of different calibers. During the production process, the corresponding bottle cap mold will be designed according to the size of the bottle caliber. For common round bottles, the inner diameter of the mold will accurately match the outer diameter of the bottle, and a certain tolerance range is usually reserved to ensure that the bottle cap can be tightly fitted on the bottle and easily installed. For example, for small-caliber bottles, such as cosmetic trial bottles, the inner diameter of the bottle cap mold will be designed to be smaller, and during the manufacturing process, the dimensional accuracy requirements are higher to ensure good sealing performance. At the same time, in order to adapt to different shapes, the mold will have a variety of shapes. For square or special-shaped bottles, the mold will be designed to fit the edge contour of the bottle, so that the bottle cap and the bottle can fit closely in appearance, and there will be no loosening or misalignment during use.
2. Adjustment of the sealing structure
In order to adapt to bottles of different calibers and shapes, the sealing structure of plastic bottle caps will also change. For bottles with larger diameters, liquids or items are more likely to leak due to the larger opening, so the sealing structure inside the bottle cap may be more complicated. For example, multiple layers of sealing gaskets or increased width of the sealing ring will be used to ensure that liquid leakage can be effectively prevented under different usage environments. For special-shaped bottles, the sealing structure needs to be customized according to the special shape of the bottle. For example, the sealing part of some elliptical container caps will be designed with different sealing flanges along the major and minor axes of the ellipse, which can better fit the irregular shape of the bottle and ensure the sealing effect. In addition, the choice of sealing materials will also take into account the purpose of the bottle. If it is used to hold volatile liquids, such as perfume, the sealing material will have better chemical resistance and low permeability.
3. Material elasticity and plasticity
The elasticity and plasticity of plastic bottle caps enable them to adapt to different bottles. Many plastic bottle caps have a certain elasticity, such as polyethylene (PE). This elasticity enables the bottle cap to produce appropriate deformation when it is put on bottles of different diameters. When the bottle cap is put on a bottle with a slightly larger diameter, the elasticity of the material allows the bottle cap to open and fit tightly to the bottle; while for a bottle with a slightly smaller diameter, the material can be slightly compressed, which can also achieve a good seal. In terms of shape, plastics with strong plasticity can be made into various shapes through injection molding to match the bottle. For example, for some bottles with curved shapes, Plastic bottle caps can be formed according to the mold shape during high-temperature injection molding, and after cooling, they can perfectly fit the curve of the bottle, ensuring the stability and sealing of the bottle cap during use.
4. Diversity of connection methods
The connection method of Plastic bottle caps to the bottle body will also vary depending on the diameter and shape of the bottle body. For small-diameter bottles, a simple threaded connection method is usually used, which ensures sealing while facilitating consumers to open and close. For large-diameter bottles, a snap-on or press-screw connection may be used. The snap-on connection is suitable for some bottles that need to be opened and closed quickly, such as some food cans, whose bottle caps and bottles are tightly connected by a special snap-on structure, which is easy to operate. For special-shaped bottles, the connection methods may be more diverse. For example, for some special-shaped cosmetic bottles, the bottle cap may be connected to the bottle body through magnetic attraction or nesting. This innovative connection method can not only adapt to the shape of the bottle, but also increase the beauty and convenience of the product.
