With help from Sumitomo Demag, Shin-Etsu, and Mettler Toledo, Elmet will debut two innovative production cells to make silicone can covers at K 2022.

Compared to its predecessor, the Smartmix TOP 5000 P, the Smart TOP 7000 Pro features a completely new pump system, which now only contains approximately one third of the liquid silicone in the system, making it much easier to clean. This is particularly important for use in the medical and pharmaceutical fields where the pump unit is dismantled and cleaned each time the material changes to prevent mixing of different types of liquid silicone.

Together with three project partners, Austrian company Elmet developed two innovative injection-molding production cell that manufacture four different covers for beverage and food cans, which have been dubbed as Smartcaps.

PlasticsToday learned from Michael Schaffer, Elmet’s business unit manager tooling & turnkey, that the company built a 4-cavity mold specifically for the K Show. It will be used to make Smartcap lids in the Sumitomo booth as a souvenir for visitors, he adds.

One key feature is the controlled acceleration and deceleration injection speed. The company’s Medical Business Development Director Anatol Sattel said: “When there is no margin for error, the IntElect’s highly dynamic direct drive technology can react quicker to the injection speed changes. This not only delivers a faster cycle time but ensures the optimal product quality. All of this results in a faster ROI.”

The machine is particularly suited to medical moulders producing pipette tips, vials, drug delivery devices and injector pens, says the firm.

The dosing system design was focused on reducing the unit’s footprint to 1,150 mm/55.3 inches by 790 mm/31 inches. This makes the system the smallest liquid-silicone dosing system for 200-Liter container units on the market.

The new system boasts a material utilization level of up to 99.6%. Drums are changed automatically to increase ease of use and keep the amount of training to a minimum. Use of special seals made of FDA-compliant materials allows the Smartmix Top 7000 Pro to be used for medical applications.

Lids for food & beverage cans are manufactured by the Elmet injection molding system with an all-electric Smartshot E valve-gate cold-runner system.

The heart of the innovation is the interaction between the high-tech contributions from the four partner companies. The combination of high-precision dosing (Elmet Smartmix), the all-electric injection-molding machine (Sumitomo IntElect), and the electric valve-gate cold runner (Elmet Smartshot E) enables a new level of accuracy in the reproduction of part weights.

With Elmet‘s Smartshot E and Smartmix Top 7000 Pro systems, two of the company’s technological flagships are used in the production cell.

The drive system can be tailored to the application, so Irish customers operating in the medical space can benefit from lower energy consumption and reduced heat dissipation in air conditioned environments.

Rick Lingle is Senior Technical Editor, Packaging Digest and PlasticsToday. He’s been a packaging media journalist since 1985 specializing in food, beverage and plastic markets. He has a chemistry degree from Clarke College and has worked in food industry R&D for Standard Brands/Nabisco and the R.T. French Co. Reach him at [email protected] or 630-481-1426.

“Having our very own medical machine in Ireland now gives customers a high-spec package to support validations, run tool trials and provide valuable process optimisation training to technicians. We are anticipating this machine will generate a lot of interest from medical moulders in Ireland. Combined with the IntElect S 180 machine already installed at our new Limerick facility, we now have the ability to demonstrate a range of AI and connectivity features to customers in all sectors. Critically, customers can benefit from the convenience of running tests and trials on site, without having to travel overseas. We look forward to welcoming customers from the first week of January 2024,” said UK & Ireland Director Dave Raine.

The special four-cavity injection mold from Elmet injects four different can lids made of liquid silicone (LSR) from partner company Shin-Etsu. The silicone lids produced serve as coverings for customary beverage cans such as those for soft drinks, energy drinks, and various alcoholic beverages. A separate cavity also produces covers for customary food cans made of sheet steel.

In medical production, the difference between overfilling, a full part or a short shot can be very small. The IntElect’s maximum injection speed of 350mm per second can be reached in 0.14 seconds, opening up a more flexible process window.

The technological high-end counterpart in material provision is the Elmet Smartmix Top 7000 Pro dosing system, which delivers precise and reliable dosing of material to the Elmet injection mold. A Sumitomo linear handling device removes the parts from the mold and transfers them to the weighing cell made by Mettler Toledo where every part is weighed. The result is stored in a database and displayed graphically to demonstrate the process accuracy of the system. After weighing, the silicone parts are marked by laser to ensure highest possible traceability. After lasering, the parts are placed on a conveyor belt.

Tests  on these machines and their components have shown no signs of visible wear on the spindles, even after millions of cycles.