The influence of bottle cap design on the sealing performance of plastic cosmetic bottles

Bottle cap design plays a vital role in ensuring the airtightness of plastic cosmetic bottles. They are not just simple lids, but carefully designed seals designed to prevent leaks and product spoilage.
The type of bottle cap has a direct impact on sealing. Different bottle cap types use different sealing mechanisms. For example, screw caps rely on thread engagement to form a seal, while push caps use gaskets or seals to achieve the sealing function. Additionally, spray pumps are also a common type of bottle cap and they use a piston or valve mechanism to dispense the product. The accuracy of these pistons or valves and the performance of the seals all affect sealing performance.
In addition to cap type, cap material is also an important factor affecting sealing performance. Flexible and chemically resistant materials such as polyethylene (PE) and polypropylene (PP) can form a tight seal, while metal bottle caps provide excellent sealing properties but cost more.
Gaskets and seals are also integral parts of bottle cap sealing. They are usually made of rubber, silicone or other elastic materials and are used to fill the gap between the bottle body and cap to prevent leakage. The shape, size and material of the gasket all have an impact on sealing performance.
In addition to the above factors, the fit between the bottle cap and the bottle body is also the key to sealing. The inner diameter of the cap and the neck diameter of the bottle must match to ensure a tight fit. If the tolerance is too large or too small, it will result in a poor seal.
In addition, some plastic cosmetic bottles need to be child-proof to prevent children from accidentally opening them. However, this design also affects sealing performance and requires careful consideration.
In addition to the above factors, there are other bottle cap design factors that may affect the sealing performance of plastic cosmetic bottles. For example, the shape of the bottle cap will affect its fit with the bottle body and sealing performance. The surface texture of the bottle cap also affects friction and therefore sealing performance. In addition, the color of the cap may also affect its sensitivity to light and thus the performance of the seal.