Plastic moulding and sustainability: how to reduce the environmental footprint in production
When discussing sustainability in the plastics industry, attention almost always focuses on the finished product: recyclability, regenerated materials, end of life. What happens beforehand, namely the moulding process itself, is rarely analysed. Yet it is precisely at this stage that energy consumption, the quantity of waste generated and overall production efficiency are determined. In this guide we examine how the technological choices adopted in injection moulding can make a tangible contribution to reducing the environmental footprint of a manufacturing company.
The environmental impact of injection moulding: where it really originates
The plastic injection moulding process is by its nature a high energy consumption activity. Traditional hydraulic presses require substantial power to heat the polymer, inject it into the mould and maintain closing pressure during the cooling cycle. To this must be added the auxiliary systems, such as chillers, dryers and conveyors, which contribute significantly to the overall electrical demand of the plant.
The second impact factor is the generation of process waste. Every moulding cycle produces sprues, flash and non-conforming parts which, if not managed correctly, become industrial waste. In a context where textile client companies are demanding increasing guarantees from their suppliers in terms of environmental sustainability, the ability to minimise waste and optimise consumption is no longer an added value but a qualification requirement.
Addressing these two fronts, energy and waste, means acting on the structural causes of the environmental footprint of moulding, not on its consequences.
Energy efficiency in moulding: the technological choices that make the difference
Reducing energy consumption in the injection moulding process does not depend on a single intervention, but on a combination of integrated technological choices that act on every phase of the production cycle.
Latest generation hybrid presses
Replacing traditional hydraulic presses with hybrid models enables a significant reduction in electricity consumption for the same tonnage and cycle time. Hybrid presses combine electric drive for dosing and plasticising movements with a hydraulic system for closing, achieving the best balance between power, precision and energy saving.
Closed loop cooling systems
New generation chiller units, designed to operate in a closed loop, reduce water consumption and improve the thermal consistency of the mould, with a direct effect on the dimensional stability of the moulded part and on the reduction of non-conforming pieces.
Heat recovery
The hot air generated by the operation of presses and industrial refrigeration units can be channelled to heat the working environment, eliminating or drastically reducing natural gas consumption. This type of intervention transforms a process by-product into a zero cost energy resource, with a positive impact on both the economic and environmental balance sheet.
Moulding waste management: from a linear approach to integrated recycling
In the traditional production model, moulding waste represents a cost item and a disposal problem. Sprues, flash and defective parts are accumulated, classified as waste and sent to external operators. This linear approach generates direct costs, logistical impact and an avoidable environmental footprint.
An alternative model, already adopted by some advanced manufacturing companies, involves the integrated recycling of waste directly at the press. The scrap material is ground immediately after moulding and reintroduced into the production cycle as secondary raw material. This system makes it possible to achieve a recovery rate close to 100%, eliminating the need for storage and transport of plastic waste.
A further contribution to waste reduction comes from optimised mould design. A mould engineered to minimise sprues and material accumulation zones reduces the quantity of excess plastic at source, simultaneously improving the quality of the finished part and cycle efficiency. In this sense, the mould design phase is not merely a technical step, but a concrete action for environmental prevention.
Sustainable raw materials: the role of regenerated plastic in moulding
Beyond process efficiency, a decisive contribution to reducing the environmental footprint comes from the choice of raw materials. The use of regenerated polymers derived from post production enables a reduction in the demand for virgin plastic, with a consequent decrease in petroleum consumption and in the CO2 emissions associated with its transformation.
However, the use of regenerated plastic in injection moulding requires rigorous quality control of the granulate. Not all recycled polymers offer the same guarantees in terms of consistency in mechanical properties, fluidity and chromatic stability. For this reason, it is essential to select suppliers of regenerated raw materials that can guarantee homogeneous, traceable and certified batches.
Sustainable moulding: a commitment measured by facts
Reducing the environmental footprint of plastic moulding is not a statement of principle, but a pathway built on technological investment, process choices and material innovation. Low consumption hybrid presses, integrated waste recycling, heat recovery, the use of regenerated polymers and optimised mould design are concrete interventions that produce measurable results in terms of reduced consumption, emissions and waste.
Beschi applies these principles every day in the production of cylindrical tubes and plastic cones for the textile industry, with a plant powered to 30% by photovoltaic energy and a growing proportion of regenerated raw materials.
Would you like to know how our production processes contribute to the sustainability of your supply chain?
Contact us for a direct discussion with our technical team.
