Key Points About Bottle Caps
Introduction: Bottle caps are essential components of containers. They serve as primary dispensing tools for contents, alongside lotion pumps and spray pumps, and are widely used in products such as cream jars, shampoo bottles, shower gel containers, and tubes. This article provides a brief overview of the basic knowledge regarding bottle caps as packaging materials, for your reference:
Bottle caps are one of the primary dispensing tools for cosmetic containers. Their main functions include protecting the contents from external contamination, facilitating consumer access, and conveying brand and product information. A standard bottle cap must possess compatibility, strength, ease of opening, re-sealability, multifunctionality, and decorative appeal.
1. Sealing Principle:
Sealing is the fundamental function of a bottle cap. It involves creating a robust physical barrier at the bottle opening to prevent leakage (of gases or liquid contents) or intrusion (of external air, moisture, or contaminants). To achieve this, the inner lining must have sufficient elasticity to fill any unevenness on the sealing surface while maintaining enough rigidity to prevent it from being squeezed into surface gaps under sealing pressure. Both elasticity and rigidity must be consistent.
To achieve good sealing performance, the inner lining pressing against the bottle mouth sealing surface must maintain sufficient pressure throughout the product's shelf life. Within reasonable limits, higher pressure results in better sealing performance. However, it is evident that when pressure increases to a certain extent, it can cause bottle cap rupture or deformation, glass bottle mouth fracture, plastic container deformation, and liner damage, leading to seal failure.
Sealing pressure ensures good contact between the liner and the bottle mouth sealing surface. The larger the sealing area of the bottle opening, the broader the distribution of the load applied by the cap, resulting in poorer sealing performance under a given torque. Therefore, to achieve good sealing, it is not necessary to use excessively high fixed torque. The width of the sealing surface should be as narrow as possible without damaging the liner or its surface. In other words, if a smaller fixed torque is required to achieve the maximum effective sealing pressure, a narrower sealing ring should be selected.
2. Bottle cap classification In the cosmetics industry, bottle caps come in various forms: by material: plastic caps, aluminum-plastic composite caps, electroplated aluminum caps, etc.; by opening method: snap-on caps, flip-top caps (butterfly caps), screw caps, snap caps, plug caps, dispenser caps, etc.; by application: tube caps, lotion bottle caps, laundry detergent caps, etc. Bottle cap accessories: inner plugs, gaskets, etc.
3. Classification Structure Description
(1) Snap-on cap
Guangdong Hongyuan, as a supplier of lotion pumps and plastic bottles, specializes in the production of PET bottles, PE bottles, and plastic bottle caps for bottles. With 13 years of global trade experience, Hongyuan is dedicated to providing high-quality lotion pump heads and plastic bottle caps for the cosmetics, skincare, and personal care industries, and we believe we can enhance the market competitiveness of your products.
