Aluminum Alloy Sheets for Closures (beverage container caps)

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Caps for Beverage Bottle Cans, Glass Bottles and Other Containers

Picture of Aluminum Alloy Sheets for Closures (beverage container caps)

Closures (stoppers) are the items that close various types of container. Aluminum closures are used to seal a wide variety of glass bottles and bottle cans for soft drinks, nutritional drinks and the like. We provide closure sheet materials to meet customer needs for closures that protect a container's contents, open easily and are highly convenient.

Features

  • Chemical composition and rolling reduction and temperature can be adjusted to achieve higher material strength, allowing the sheet gauge to be reduced (making them lighter).
  • We control material composition, rolling temperature and time, and annealing temperature to produce optimal materials to meet clients’ performance needs, such as its opening capability and earing.
  • If requested, we treat materials with phosphoric acid chromate or zirconium to improve paint adherence.
  • We carefully monitor flatness and squareness to prevent color gapping, unevenness or print misalignment during printing.

Product Characteristics

Principal alloys Applications Characteristics
3105 General-purpose materials Formability is good, and strength can be standardized to meet product demands.
5355 Specialized bottle cans Material characteristics are similar to can-end stock materials, making them stronger.

Cap Production Process

Printing process

Aluminum sheet

Foundation processing

Known as a “size coat,” foundation processing is conducted to help the paint adhere better. Products that are processed using phosphoric acid chromate or zirconium are often cut.

Exterior (interior) paint

Either the public side or the product side surface may be painted first, depending on the product.

Exterior printing

The number of printing passes depends on the image to be printed on the cap.

Topcoat varnish

Glossy varnish

Cutting

A single slitter method is used to cut the sheet into three equal strips. For some products, both edges are trimmed at this time.

Press Process

First pressing

The cut printing plate is run through the press to create the cap shape (straight side walls).

Second pressing

The bottom edge of the formed cap is trimmed off (broken off) or curled.

Attaching the liner to the inner surface

Adhesive joining

Knurl forming

Protrusions are formed on the sides of the cap, near the top, to prevent slippage when twisting the lid open.

Perforations

Perforations are added to ensure that when the lid is twisted open, the TE band (ring) remains behind.

Fig. 1st Pressing

1st Pressing
Approximately 2 mm is left at the base of the pressing, forming a hat-like shape. Blank diameter: 67 mm

Fig. 2nd Pressing

2nd Pressing
At the same time as the first pressing, the hat-shaped edge is trimmed away.

Fig. Knurling

Knurling
Knurls are added as the cap rotates.

Fig. Perforation

Perforation