28mm 48mm Metal Screw Cap

In the packaging industry, metal screw caps, thanks to their excellent sealing, durability, and aesthetics, have become a preferred accessory for many product packaging. 28mm and 48mm sizes are particularly widely used.

28mm screw cap

Key Features

The most notable feature of the 28mm metal screw cap is its compact size. With an overall diameter of only 28mm and a height typically between 10-15mm, it's lightweight and highly adaptable to small containers. These screw caps are often made from food-grade aluminum alloy or tinplate. The surface can be electroplated, spray-coated, or printed to enhance rust resistance and customizable patterns for enhanced product recognition.

In terms of functional design, the 28mm metal screw cap's sealing structure is particularly impressive. Most products are equipped with a food-grade silicone or nitrile rubber sealing ring. The fine, uniform spiral pattern ensures a tight fit when tightened, effectively blocking out air, moisture, and impurities, extending the shelf life of the contents. Additionally, some 28mm screw caps feature an anti-tamper ring that breaks once opened, preventing product tampering and enhancing consumer safety.

Typical application scenarios

Food and Beverage Industry: It is commonly used for small bottles of condiments (such as vinegar, soy sauce, and chili sauce), mini fruit juices, and concentrated syrups. For example, the 50-100ml small bottles of sauces commonly found on the market are often fitted with 28mm metal screw caps, which ensure a tight seal without being bulky due to the large size of the cap.

Cosmetics and Daily Chemicals Industry: It is suitable for small-volume skincare products (such as serum samples and travel-sized lotions), nail polish, and perfume samples. These products prioritize portability and a refined aesthetic, and the compact size of the 28mm screw cap perfectly complements the miniature packaging. The metal material also enhances the product's premium feel.

Pharmaceutical Industry: Some small-dose oral medication bottles and medicinal alcohol vials also use 28mm metal screw caps. The food-grade material and tight seal ensure that medications remain contaminated during storage, and the tamper-evident ring prevents accidental opening or tampering, ensuring medication safety.

48mm metal screw cap

Core features

Compared to 28mm screw caps, 48mm screw cap offers superior adaptability for larger volumes. With a diameter of 48mm and a height typically between 15-25mm, the cap offers more space inside, allowing for wider bottle openings or thicker gaskets, making it suitable for larger containers. While primarily constructed from aluminum alloy and tinplate, some models feature thicker sidewalls to withstand greater tightening force, improving structural stability.

In terms of sealing performance, the 48mm screw cap's advantage lies in its "high-strength seal." In addition to the conventional sealing ring design, some products feature a dual-seal structure (e.g., inner and outer sealing rings), effectively counteracting the turbulence and squeezing of large-volume liquids during transport, preventing leaks. Furthermore, the 48mm screw cap offers greater flexibility in opening. Some styles feature anti-slip grooves or raised opening tabs, making it easier for users to open with force, thus resolving the difficulty of unscrewing large-capacity bottle caps.

Typical Applications

Food Industry: It is primarily used for large-volume bottled foods, such as 1-5L edible oil bottles, 2-10kg barrels of sauces (such as doubanjiang and peanut butter), and large bottles of honey. For example, in the case of edible oil bottles, the 48mm screw cap fits snugly over the wider bottle opening. The dual-seal structure prevents oil oxidation and deterioration, while the anti-slip grooves make it easy for consumers to tighten the cap after each pour.

Chemical and Industrial Industries: It is suitable for small chemical reagent bottles (such as 500ml-2L alcohol and detergents) and industrial lubricant barrels. These products require high sealing and corrosion resistance. The 48mm metal screw cap's thickened material and tight sealing structure effectively prevent reagent volatilization and external impurities from entering, ensuring stable product performance.

Household Goods: It is commonly used in large-capacity bottles for laundry detergent, dishwashing liquid, and disinfectant. Household cleaning products are frequently used, and the 48mm screw cap's large opening facilitates pouring, while its tight seal prevents liquid leakage, even when the bottle is stored upside down or tilted.

Original source: https://www.alubottlecaps.com/a/28mm-48mm-metal-screw-cap.html

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