In the medical injection molding industry, energy consumption has always been a key factor restricting the development of enterprises. Medical injection molding places extremely high control requirements on the purity of particulates, microorganisms, and process media in the production environment. This leads to not only persistently high energy consumption in traditional energy supply systems but also becomes a critical bottleneck restricting quality stability and cost control. However, through a series of innovative technological and management approaches, the medical injection molding industry can fully achieve energy-saving and consumption reduction, enhancing its competitiveness.

1. Optimization of Water, Electricity, and Gas Systems

• Cooling Water System Transformation: In medical injection molding, the stability of mold cooling water temperature directly affects the product's shrinkage rate, internal stress, and crystallinity, which are core factors influencing dimensional accuracy and performance consistency. Traditional open cooling water systems suffer from issues such as significant temperature fluctuations and unreasonable pipeline layouts, resulting in uneven cooling efficiency among different machines. By adopting a same-process water supply design and stainless steel pipelines, it can be ensured that the total resistance of the water supply and return pipelines for each injection molding machine is basically equal, achieving consistent pressure between the first and last machines. Meanwhile, stainless steel pipelines have smooth inner walls, are less prone to corrosion and microbial growth, meeting the fundamental requirements of the medical industry for the cleanliness of production media.
• Power Supply Optimization: Medical injection molding machines often need to operate continuously and stably for long periods, posing dual high requirements on the response speed and energy consumption performance of the drive system. Through servo motor transformation, the motor's torque and speed can be adjusted in real-time and precisely according to the actual process requirements during each stage, such as mold closing, injection, pressure holding, cooling, and mold opening. This avoids the energy losses of up to 40%-80% due to overflow in traditional fixed-displacement pump systems during the pressure holding and cooling stages. Measurements show that servo-transformed injection molding machines generally achieve energy savings of 30%-50%.
• Compressed Air System Optimization: Compressed air is used in medical injection molding for pneumatic ejection, part conveying, and maintaining positive pressure in clean rooms, among other purposes. Its quality and supply stability are of utmost importance. By increasing pipeline pressure and reducing consumption, as well as implementing zoned air supply, the leakage rate can be reduced. Additionally, pressure-graded air supply can be implemented according to the differentiated requirements for air pressure and cleanliness in different applications, avoiding the waste of "using high pressure for low-demand applications." Meanwhile, a combined dryer is used to ensure a stable dew point at the outlet air, and ultra-precision filters are installed upstream of the air usage points to remove oil, particulates, and microorganisms, providing "surgical-grade" clean air sources for the production processes.

2. Centralized Material Feeding and Intelligent Control

• Centralized Material Feeding System: The centralized material feeding system achieves precise delivery and efficient utilization of raw materials through PLC intelligent control and automatic material replenishment. The system supports first-in-first-out (FIFO) and last-in-last-out (LIFO) strategies, which can be flexibly configured according to the characteristics of different raw materials, avoiding moisture absorption and deterioration of raw materials due to long-term storage. Meanwhile, through barcode scanning and weighing, as well as batch management, the raw material defect rate is reduced to below 0.3%. The central control platform integrates PLC and IoT modules to monitor the material feeding status of each machine in real-time. Any abnormalities automatically trigger alarms and are pushed to mobile terminals, significantly reducing the frequency of manual inspections.
• Intelligent Drying and Recycling: For highly moisture-absorbent materials such as LCP and PBT, independent drying pipelines are designed with a stable dew point control of -40°C and a moisture content of ≤0.005%. The closed-loop conveying system has a dust emission of <5 mg/m³, meeting the cleanliness standards for medical and optical products. Meanwhile, a heat recovery device is used to recover waste gas heat for pre-drying raw materials, reducing electricity consumption by 35%. Sprue materials are automatically crushed and mixed back in proportion, saving over 300,000 yuan in annual raw material procurement costs.

3. Energy-Saving Equipment and Process Optimization

• Application of Energy-Saving Equipment: The use of energy-saving dryers, energy-saving heating rings, and other new equipment, through double-layer stainless steel materials, insulation layer design, and intelligent control systems, significantly reduces energy consumption. For example, energy-saving dryers can adjust the drying time and temperature according to the moisture content and drying requirements of the materials, avoiding over-drying and further improving energy utilization efficiency.
• Process Parameter Optimization: Under the premise of meeting product performance requirements, use the shortest possible molding cycle and optimize the injection, pressure holding, and cooling times. Meanwhile, follow the processing parameters recommended by material suppliers to avoid盲目 (blindly) increasing temperature, pressure, or extending time, which leads to increased energy consumption. Through CAE-assisted design technology for mold design, mold flow analysis, and simulation, the energy consumption of mold debugging and multiple mold repairs can be reduced, the molding cycle can be shortened, and energy consumption can be decreased.

4. Production Management and Staff Training

• Production Plan Optimization: Reasonably arrange production tasks to avoid equipment idling and frequent start-stop operations, which can effectively reduce energy consumption. Meanwhile, strengthen equipment maintenance and upkeep to ensure that the equipment is in good operating condition and reduce energy waste caused by equipment failures.
• Cultivation of Staff Energy-Saving Awareness: Through energy-saving training and publicity activities, let employees understand the importance of energy conservation and specific methods, and encourage them to actively participate in energy-saving actions in their daily work. For example, promptly turn off the power of equipment that is not in use and pay attention to energy-saving operations of the equipment.

5. Case Analysis

Take a medical injection molding enterprise in Changzhou as an example. After implementing the above energy-saving and consumption-reducing solutions, the enterprise achieved remarkable results. After the transformation, the mold thermal deformation rate decreased by 40%, and the product dimensional tolerance was stable at ±0.05 mm. The annual electricity consumption dropped from 1.2 million kWh to 850,000 kWh, reducing electricity costs by 40%. The product defect rate decreased from 1.2% to 0.05%, and the enterprise successfully passed the FDA certification audit. These data fully demonstrate the feasibility and effectiveness of energy-saving and consumption-reducing solutions in the medical injection molding industry.