25mm aluminum ROPP caps (Roll-On Pilfer-Proof Cap) is an anti-theft cap suitable for packaging containers with a bottle mouth diameter of 25mm. ROPP caps are usually made of aluminum and have good sealing properties, which can effectively prevent liquid leakage and external contamination. The height of ROPP caps is usually between 15 and 20 mm, and the specific height may vary depending on the manufacturer and design.

Manufacturing process of 25mm ROPP caps:

1. Material preparation

- Raw materials: aluminum sheets 3105 or 8011(for example, a factory needs 1,000 tons of aluminum to produce 250 million bottle caps per year).

- Coating treatment: The aluminum closure sheet is coated with colored glossy paint, and the pattern is printed after 25 minutes of drying to ensure bright colors and scratch resistance.

2. Forming and stamping

- Punching forming: High carbon steel blades press 500 aluminium ROPP caps blanks per minute.

- Precision stamping: Two stampings adjust the size to ensure a perfect match with the bottle mouth, with a tolerance of ±0.2mm.

3. Decoration and modification

- Side printing: Special ink is used to print patterns through the steel coil decorative tape, and then dried and cured in a warm oven.

- Pad embedding: Embed polyethylene or rubber pads to ensure sealing, and pass the temperature and alcohol resistance tests.

4. Quality inspection

- Light detection: Check whether the shapes of cut lines, grooves and ridges meet the standards.

- Sealing test: Ensure that there is no leakage or air leakage, in accordance with GB/T 17876 standard.

Features of 25mm aluminum ROPP caps:

- Strong sealing:

The ROPP bottle cap design ensures a tight connection between the bottle mouth and the bottle cap to prevent oxidation and deterioration of the contents.

- Anti-counterfeiting function:

ROPP bottle caps usually have anti-counterfeiting designs, and consumers can determine whether the product has been tampered with by checking the integrity of the bottle cap.

- Easy to open:

The design makes it easy for consumers to open it easily after purchase, and usually requires the use of a special bottle opener.

- Lightweight and corrosion-resistant:

Aluminum is lightweight and has good corrosion resistance, suitable for packaging a variety of liquids.

- Recyclable:

Aluminum bottle caps have good recyclability and meet environmental protection requirements.

Main application areas of 25mm ROPP caps:

- Food and beverage:

Case: milk tea, juice, and wine packaging (such as red wine and beer bottle caps).

Advantages: The anti-theft design prevents illegal opening, and the sealing ensures the freshness of the product.

- Medical and health care:

Case: oral liquid and injection bottle caps (must meet medical grade hygiene standards).

Standard: The material must be certified by GB 4806.1 (Food Contact Material Hygiene Standard).

- Cosmetics:

Case: lotion pump, essential oil bottle cap.

Features: electrochemical aluminum surface treatment, support for customized patterns and LOGO.

25 mm aluminum ROPP caps have stable demand in the fields of food and beverage, medicine, and cosmetics due to their anti-theft, sealing, and recyclable characteristics.