INNOVATION | CAPS AND CLOSURES


rotation, the second component (2.10 g) is injected at station three. Finally, the finished parts are removed automatically at station four, also without influencing the cycle time.” A six-axis robot which is fully integrated in the machine controller sets the finished parts down on a conveyor belt. The controller runs a check for any defective injection moulded parts which are then removed by the robot system. Arburg


says that test samples can be removed at the


Above: Engel developed the all-electric E-cap machine series specifi- cally for caps and closures production


was 1.25 g, resulting in a total shot weight of 120 g. The cycle time of this application is less than 2 s with an injection time of less than 0.3 s. In the tests, targeted process changes were


introduced, among other things by changing the raw material batch several times. The changes resulted in the production of caps outside the tolerance range. Engel says: “The injected melt volume, for example, exhibited deviations of up to 1.5 cm³ from the reference value. With iQ Weight Control activated, it corresponded to the reference value again. This meant that good parts could be produced from the first shot after the batch change. In addition, the process stability was improved by 66%.” Arburg developed its Allrounder Cube ma- chines for high-volume production in the packag- ing sector using a cube mould, in which four sides of the mould can be used to increase the number of cavities without affecting the cycle time. In July last year, it launched its 180-tonne Allrounder Cube machine, illustrating its capabilities using the example of a two-component sealing cap for personal care packaging. In this application, the new Allrounder Cube 1800 machine produces four bichrome sealing caps made from chemically recycled PP from Borea- lis in a 4-cavity pilot mould from Foboha in a cycle time of 8.7 s. Describing the process, Arburg says: “Four frames each weighing 0.85 g are injected at station one. Having been rotated 90 degrees onto the passive side of the cube, the pre-moulded parts are cooled at station two. Following a second


touch of a button and set down in QA trays sorted by cube side for visual inspection of the parts. The hybrid Allrounder Cube 1800 has a clamp-


ing force of 1,800 kN and a distance between tie-bars of 570 x 570 mm. It can be equipped with horizontal injection units in sizes from 400 to 1300 and moving injection units in sizes from 70 to 800. The cube mould from Foboha is easily accessible from above. The rotation of the cube is powered servo-electrically and the horizontal movement relies on rack and pinion mechanisms. Arburg says that when fitted with an 8+8-cavity


mould, the Allrounder Cube 1800 is capable of more than double the output quantity of a conven- tional size 570 Allrounder with a 4+4-cavity rotary mould working with the same mould mounting surface. Alternatively, it has the same output as at least two Allrounders with comparable tie-bar spacing or one injection moulding machine three numbers larger.


CLICK ON THE LINKS FOR MORE INFORMATION: � www.husky.co � www.tetrapak.com � www.trimascorp.com � https://affabaferrari.com � www.riekepackaging.com � www.aptar.com � www.berryglobal.com � www.gualaclosures.com � www.sabic.com � www.engelglobal.com � www.arburg.com


Plastic Closure Innovations event


AMI’s Plastic Closure Innovations conference on 7-9 June in Barcelona, Spain, brings together influential speakers to give an in-depth view on all the important aspects of the plastic closure industry. The conference will be focussing on material and technol-


28 INJECTION WORLD | April 2022


ogy developments to help improve production efficiency and sustainabil- ity, caps and closures innovations and how changing market demands, consumer behaviour and legislation are shaping new product develop- ment. This year’s programme will also


include end-user perspective, mergers and acquisitions, sustainabil- ity materials, technology trends and developments in tethered closures. Book you place by email joe.huckings@ami.international or at the conference website.


www.injectionworld.com


IMAGE: ENGEL


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