CAPS AND CLOSURES | TECHNOLOGY
and technology suppliers, according to Arburg. Reiner Schmid, Senior Application Manager Packaging, says: “First and foremost, attention will be paid to energy-efficient technology, which corresponds to the trend towards electric machines or electrified axes. With the electric and hybrid Allrounders, and especially with the electric injection units of sizes 1300 and 2100, Arburg has the necessary equipment for high-speed applica- tions in its range. This also applies for the usual high-cavity moulds in the area of caps and closures, where 72- and 96-cavity moulds for standard beverage closures are the norm.” In the injection moulding of caps and closures,
In the future, recycled materials will be increasingly used for closures. For their processing, Arburg offers a recyclate package as well as special controller functions such as the aXw Control RecyclatePilot, which ensures a stable shot weight by means of adaptive process control
and E-motion the fastest Engel injection moulding machines. Cycle times of less than 2 s enable the production of plastic caps profitably and without disruption. Engel’s E-motion and E-cap injection moulding machines have efficient servo-electric drives, which minimises energy consumption (up to 50%) in plastic cap production. In addition, the machines are robust and reliable, and deliver maximum performance. The screw and non-return valves are specifically developed for plasticising HDPE with a low melt flow index to ensure trouble- free processing of caps and closures. The E-cap injection moulding machine also
ensures lower maintenance due to electric drive technology and an encapsulated toggle lever reduces the need for lubricants. Increased product quality is ensured through totally clean production. There is no dirt and oil mist, but optimum lubrica- tion with the smallest oil amounts. Encapsulated toggle lever, closed spindle lubrication, sealed bearings and linear guidance of the moving platen ensure a clean mould area and conveyor belts. Engel says the E-cap is equipped for the require-
ments of the packaging industry. This means continuous operation under maximum load. Permanent monitoring of lubrication and motor temperature ensure reliable and problem-free operation. In addition, critical components such as the screw and spindle are monitored during operation with the digital solution E-connect. monitor. The remote maintenance tool E-con- nect.24 allows additional support worldwide. The EU directive 2019/904 on tethered caps remains a priority for the caps and closures market
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energy efficiency continues to drive new develop- ments. “For energy efficiency reasons alone, electric drives are increasingly being used in combination with electric mould technology,” says Schmid. “Due to the incorporation of servo motor manufacturer AMKmotion, the production of the entire powertrain, including the inverter, motor and planetary roller screw drive, has been an internal matter for the Arburg family since 2021. This allows the company to act much more flexibly in the market and adapt its machine technology to the needs of customers.” In addition, increased cooling water tempera-
tures of between 20-30°C are coming into focus, which requires adjustments on the machine and mould side to ensure an increased media flow, for example through adapted piping and tubing. He says the trend for increased use of recycled materials is catered for by Arburg’s recycling package, including a specially modified cylinder module, as well as Gestica control system functions such as the aXw Control ScrewPilot for stable mould filling and the aXw Control PressurePilot for
At K2022, an Arburg Allrounder Cube 2900 machine produced 32 two-colour flip-top closures in a cycle time of 8.5 s. The cube-mould technology increases output while reducing the energy requirement
April 2023 | INJECTION WORLD 39
IMAGE: ARBURG
IMAGE: ARBURG
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