ERJIN PACK details how two-piece aluminum cans are made at high speed

ERJIN PACK outlined the end-to-end production flow for its two-piece aluminum cans, from raw 3104 aluminum coils to printed, lined, necked and inspected cans ready for filling. The process highlights the manufacturing precision, recycling loop and quality controls that beverage brands rely on to keep high-speed lines running.

Why it matters: - Two-piece aluminum cans are a core packaging format for beer, soda and sparkling water, so manufacturing quality affects filling-line speed, shelf life and transport stability. - ERJIN PACK says a single production line can convert raw metal coils into more than 1 million food-grade cans per day. - The company says its automated lines run above 2,000 cans per minute, with tolerances under 0.01mm. - That scale matters for beverage brand managers and procurement teams that need consistent packaging supply and predictable line performance.

What happened: - ERJIN PACK published a step-by-step overview of how its two-piece aluminum cans are made. - The process starts in Shandong, China, with 3104 aluminum alloy master coils that are unrolled and fed into a multi-die cupping press. - The workflow moves through drawing, ironing, doming, trimming, washing, printing, lining, necking, flanging, inspection and palletizing. - The company says the finished cans are shipped to cooperating filling facilities worldwide.

The details: - In the cupping stage, the press punches circular discs from flat aluminum sheet and forms them into shallow cups. - Skeleton scrap from blank punching is collected and sent to thermal smelting furnaces for closed-loop recycling. - During drawn and wall ironing, a reciprocating punch pushes each cup through tungsten carbide ironing rings. - The process reduces sidewall thickness from 0.28mm to 0.10mm and extends container height beyond 130mm. - At the bottom-doming stage, the base is pressed into an inward concave shape to resist pressure from carbonated drinks and liquid nitrogen dosing. - Rotary knives trim uneven top rims after ironing so the can edges are smooth and uniform for later flanging. - Cans pass through a 6-stage washing system that includes acid wash, ultrasonic degreasing, deionized water flushes and high-temperature tunnel drying. - ERJIN PACK says the cleaning step removes lubricant, aluminum particles and moisture before decoration and lining. - Printing uses 6-to-8 color rotary dry-offset presses for high-resolution graphics. - The company lists glossy finish, matte finish, white base coatings and tactile inks as available surface effects. - An internal food-grade liner is sprayed into rotating cans to keep beverages from contacting raw aluminum. - ERJIN PACK says the liner helps prevent metallic off-flavors and supports a 12-to-24 month shelf life. - The company says it offers epoxy liners and BPANI liners for North American and European regulatory requirements. - Die necking narrows the top opening from about 60mm to 52mm or 54mm, corresponding to 202 or 200 neck specifications. - Flanging shapes the top edge for double-seaming at downstream filling plants. - Quality control includes optical camera scanning, dome pressure testing, pin-hole detection, light-leak checks and batch sampling for thickness and dimensional checks. - Passing cans are stacked on export-qualified wooden or plastic pallets, strapped, shrink-wrapped and sent out for delivery.

Between the lines: - The production sequence is designed around both speed and defect control, which is critical because small inconsistencies in wall thickness or lining can affect can performance later in the supply chain. - The closed-loop recycling step suggests ERJIN PACK is positioning the process as both industrially efficient and material-efficient. - The emphasis on surface finishes and tactile inks shows that beverage packaging is being treated as both a structural product and a branding surface.

What's next: - ERJIN PACK says it will continue supplying standard, sleek and slim can profiles for high-speed filling equipment. - The company says it supports customers with technical service intended to keep filling lines stable and improve shelf visibility in retail. - Its broader business focus remains direct wholesale aluminum can supply, export logistics and cooperation with beverage brands across Europe, the Middle East and Southeast Asia.