thin wall moulding | Innovations Right: Up to
35% cycle time reductions have been
achieved using GWK’s Integrat 4D conformal cooilng
technology for thin wall
production
comprising 94 valve gates arranged over five moving ele- ments with 49 individual injection control zones. Meanwhile, another major player in the melt delivery
sector, Synventive, says its new nuGate gate control for pneumatically controlled hot runner systems allows the user to define the valve pin’s position, speed, acceleration and stroke. The company says this delivers unparalleled accuracy and repeatability while the high level of control facilitates a stable process and solves a variety of part cosmetic issues or system balance challenges. Synventive says nuGate can prevent moulding
or during cycles in order to distribute plastic anywhere inside the mould. Gates can be located directly inside the moving slides of a mould. Thielen explains the benefits of the technology in
production by citing the example of a large PP container with a volume of one cubic metre and walls 0.8mm thick. Using a conventional hot runner mould, the mould designer would face big problems in getting the melt to flow all the way to the rim of the cavity. A moveable manifold can overcome these issues, he says. “In such a large container, you would probably have
undercuts and ribs,” says Thielen. “The mould walls need to be able to move so that the core can come away with the part on it.” This movement is always a problem for cooling and feeding, he says. Using the slide technology it is possible to arrange nozzles so that the melt can go all the way to the rim, even when moulding a very large part with very thin walls. Thielen sees the technology being used for production of parts such as refrigerator liners as well as for large houseware items. The Slide Manifold technology is already in commercial use but applications are confidential. However, MHS has previously shown a schematic of a commercial system
Learn more at these conferences
Learn more about thin wall packaging moulding and network with leading players and sector suppliers at Applied Market Information’s North American and European Thin Wall Packaging conferences. The North American event takes place on 6-7 May 2015 in Chicago in the US; while the European conference will be held in Cologne in Germany on 1-3 December 2013. Thin Wall Packaging 2015 - North America Thin Wall Packaging 2015 – Europe Thin wall moulding technology also features in Applied Market
Information’s third Plastic Closure Innovations conference, which takes place in Berlin in Germany on 9-11 June 2015.
40 INJECTION WORLD | January/February 2015
defects such as marks opposite direct gating, and sink marks. By proportionally regulating the pneumatic flow of the actuator’s opening and closing ports, nuGate is able to control the complete movement of the pin. “Users gain a level of control that allows for a regulated release of melt pressure into the cavity,” says executive vice president Mark Moss.
Targeting cooling Temperature control specialist GWK says that for applications such as production of thin-wall PP tubs, segmented mould cooling with adjusted flow control us- ing its integrat 4D segmented temperature control system can cut some 35% off total cycle time. Segment- ed cooling with the cooling channels placed as close as possible to the cavity surface (conformal cooling) provides a more homogeneous temperature on the mould surface, yields significant energy savings, broadens the process window, and can even extend the lifetime of the mould, says Thomas Leng, head of system engineering at the company. Using such a system, production of 500ml containers
on a two-cavity mould takes just 2.7s, for example. While the use of the Integrat 4D technology ups the investment cost, Leng says in this example the addi- tional investment would be recovered in just four months. GWK’s integrat 4D system includes segmented cooling inserts, which are made to order, as well as the temperature control system.
Click on the links for more information: ❙
www.arburg.com ❙
www.bmb-spa.it ❙
www.engelglobal.com ❙
www.xaloy.com ❙
www.sumitomo-shi-demag.eu ❙
www.stackteck.com ❙
www.gr8eng.com ❙
www.trexel.com ❙
www.moldhotrunnersolutions.com ❙
www.synventive.com ❙
www.gwk.com
www.injectionworld.com
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