Hot runner nozzles Fitting hot runner systems into increasingly complex moulds
With energy efficiency, measuring technology and temperature control, the requirements for hot runner nozzles are becoming more and more demanding. If the hot runner systems also need to fit into small spaces, they have to be designed as compact as possible.
The technical centrepiece of any hot runner system is the hot runner nozzle. This has a decisive influence on the mechanical properties, the quality and the appearance of the injection-moulded part. In addition, the properties of the hot runner nozzle frequently influence production efficiency, such as short cycle times, a low energy requirement and a low outlay on maintenance. For this reason, the customer requirements for a hot runner nozzle have undergone considerable development over the past few years. Customers no longer wish to adapt to the predefined solutions of hot runner suppliers but are increasingly asking for tailor-made products that can be aligned individually and as easily as possible to specific applications.
Global competition is currently creating a situation where designers, mould-makers and injection moulders are increasingly called upon to generate unique selling points through innovations. And it is important to always keep an eye on cost efficiency and profitability when doing this.
Moulds are increasingly incorporating a greater number of functions in the fields of demoulding, measuring technology and temperature control. At the same time, however, attempts are made to keep the moulds as compact as possible so that production can be run on the smallest possible injection moulding machines. This means that hot runner systems also have to fit into increasingly small installation spaces and thus have to be designed to be as compact as possible.
Hasco’s hot runner division has responded to these latest requirements by developing the new Vario Shot nozzle series H6000 that is tailored to current market demands. The Hasco hot runner specialists have channelled all of their knowledge and experience, acquired over 40 years of practical application, into this nozzle. The development work focused on aspects such as homogeneous temperature distribution, compact design, a broad application range thanks to a modular system and ease of servicing.
It was important for countless practical tests to be performed during the concept phase so that all the ideas could be thoroughly checked. In addition, using the first prototypes, injection moulding tests were conducted on actual applications together with the customers. According to the company, ever since the Vario Shot nozzle series was brought onto the market for K 2016, the nozzles have already been successfully used in more than a thousand applications.
Customisable nozzles for specific user requirements
The positive feedback from users shows that Hasco has developed a premium product that fulfils all of its users requirements, the company says. According to Hasco, it has achieved the optimum balance between a compact design and an optimum temperature distribution, making the nozzle feasible to process challenging plastics without any problems.
The flow-optimised torpedo geometries permit gentle transport of the melt and hence high-grade injection-moulded parts. The modular parts concept and the vast range of special torpedo variants to choose from means that Hasco is in a position to customise the nozzle for any specific application. In addition, this concept offers particularly easy servicing, since all the components are easily exchangeable, including the heating unit, sensor and torpedo tip.
The modular component concept also offers business advantages. The number of individual parts to be assembled has been more than halved compared with the Techni Shot series and the number of configurable variants has been more than doubled despite this. Reducing the number of component types ensures efficient stock management, thus further increasing availability.