Optimising Plastic Moulding with Latest Temperature Control Technologies: Increased Precision, Reduced Cycle Times and Lower Energy Use
By Dave Palmer, general manager for UK at ICS Cool Energy
Across industries and applications like medical and automotive manufacturing where precision, product consistency and process repeatability are especially vital, there is a growing demand for higher energy efficiency and reduced cycle times.
Temperature control technology plays a pivotal role in plastic injection moulding processes, ensuring consistent product quality and production efficiency. Temperature control and stability also have a direct effect on cycle times and output. Manufacturers’ economic success depends to a high degree on the development of reliable production, and the ability to efficiently control and maintain the right process temperatures within the various stages of the process is critical to achieve this.
Accurate and reliable process temperatures
Providing accurate and reliable process temperatures for equipment that is designed to operate at high temperatures creates a real challenge. It’s not only because of the extremely high operating temperatures required but also because each composite and product being manufactured on the machine requires a very precise temperature level.
Traditionally, a Temperature Control Unit (TCU) has three main functions – to heat, to cool and to control. It works alongside a process-grade chiller to provide enhanced cooling power, and at elevated temperatures provide accurate temperature control with minimum temperature deviation. It does so by regulating the heating elements contained within the TCU, teamed with the cooling capacity provided by the chiller.
Until recently, all the manufacturers could do with a standard TCU was setting a temperature range, flow rate and test it until the desired quality was achieved. The latest developments in the TCU’s designs, have brought precision temperature control to a new level, a level that allows the manufacturer not only to achieve the precise temperature, but is also reducing the power consumption of the system. All this thanks to new, innovative speed control pumps.
Control over TCU’s pump speed
With these new pumps, operators gain control over temperature differentials (ΔT) across the mould. Once the desired temperature is achieved, operators can configure the desired ΔT and this will adjust pump speed accordingly. This dynamic adjustment isn’t just a solution to demand for heightened precision in plastic moulding, it’s a game-changer that reduces power consumption by between 50 and 90% at the pump level, depending on the application. Moreover, it significantly reduces cycle times, a critical gain for industries seeking to ramp up production speed.
To illustrate the impact, consider a manufacturing line currently producing a mould every 10 seconds. If the goal is to accelerate this pace to one mould every 8 seconds for increased output, enhanced cooling is essential to expedite the solidification process. With speed control pumps on the TCUs, operators can fine-tune the desired ΔT and cooling levels, achieving precise control over the cooling process.
A comparison between a system equipped with centrifugal pumps and utilizing ΔT control, and a device featuring unregulated peripheral impeller pumps speaks volumes. In a three-shift operation, the contrast in annual electricity consumption is 14.495 kWh versus a mere 1.160 kWh with the new systems. For manufacturers operating multiple moulding machines with TCUs, the cumulative energy savings can be significant, contributing to both cost reduction and environmental sustainability.
Keep your processes running
In the continuously changing environment, manufacturers face many challenges in embracing and understanding new technology, wanting to provide customers with the best quality products while also reducing their operating costs. The fact that around 60 % of a plant’s total lifecycle cost can be attributed to process cooling and refrigeration systems, makes it a vital investment that shouldn’t be overlooked.
Engaging with a partner that knows the inside and out of process temperature control can help in every step of the way from surveying the sites to understanding where efficiencies can be made – recommending bespoke, fully packaged, process-designed chillers and TCUs based on tried and tested processes.
There is just a handful of expert companies that would look at the manufacturer’s critical processes, and deliver a detailed, documented plan to keep his operations running. If it came to the worst and a chiller broke down, that partner should be able to say exactly what, when and where it happened and provide a solution to keep the plant up and running in matter of hours. Either by fixing the issue or providing a contingency solution to fill the gap. This is the part of the production that directly influences whether a plant can maintain the quality, keep their production running and keep their end customers satisfied.
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