Twelve Practical Techniques to Reduce Energy Consumption in Injection Molding Workshop
2026-04-27 11:04:32
Injection Molding
Injection molding manufacturing is a typical high-energy-consumption processing industry, with intensive energy loss in electric power, cooling water, compressed air and thermal heat. Long-term 24-hour continuous equipment operation, unreasonable parameter setting, extensive on-site management and aging equipment components will cause huge invalid energy waste. Combined with practical workshop production experience, this paper summarizes 12 highly practical and implementable energy-saving techniques from five dimensions: equipment refined management, molding process optimization, mold performance improvement, public engineering adjustment and standardized on-site management. Without large-scale renovation investment, these measures can effectively reduce workshop power consumption and production costs, stabilize product molding quality, extend equipment service life, and adapt to long-term mass production operation of various plastic injection workshops.
I. Refined Control of Equipment OperationIdle operation and long-term no-load standby of injection molding machines are the main causes of ineffective energy waste. Formulate unified equipment start-stop standards for mold replacement, material waiting, lunch breaks and off-duty gaps. Timely turn off barrel heating and oil pump motors to avoid long-term idle rotation and invalid power consumption. Arrange staggered start and stop of multiple equipment to prevent instantaneous peak power load, reduce additional high-voltage power fees, and realize fundamental reduction of basic energy consumption.
Most traditional fixed-pump injection molding machines have serious overflow loss. All mass-production equipment shall be enabled with frequency conversion and servo energy-saving modes. The system automatically matches pressure and flow according to different processes of injection, pressure holding and cooling, reducing useless hydraulic work. Regularly inspect hydraulic valves and sealing parts to eliminate internal oil leakage and pressure loss, and avoid extra power consumption caused by repeated pressurization of the hydraulic system.
Implement segmented temperature control for material barrels to reduce heating energy consumption. Adjust the temperature of the rear material barrel to a lower level during standby material waiting, and only maintain front-end heat preservation. Reduce temperature in time during material replacement and cleaning to avoid thermal decomposition of raw materials and continuous power consumption of heating coils, achieving dual effects of energy saving and carbon deposition prevention.
II. Energy-Saving Optimization of Injection Molding ProcessLong molding cycles directly increase the comprehensive consumption of electricity, water and gas per product. On the premise of ensuring product size and appearance quality, optimize cooling time, mold opening and closing speed and ejection rhythm to compress invalid action time. Avoid excessive cooling and redundant pressure holding, balance product shaping quality and production efficiency, and reduce single-piece energy consumption by shortening the overall molding cycle.
Excessively high injection pressure and clamping force will greatly increase equipment operating load and power consumption. Set parameters strictly according to actual mold molding requirements, appropriately reduce injection pressure and holding pressure, and eliminate redundant over-limit parameters. Set clamping force reasonably to avoid long-term ultra-high pressure mold clamping, which not only saves electric energy, but also reduces parting surface wear and prolongs mold service life.
Within the qualified range of product quality, appropriately reduce mold temperature to lower the operating load of mold temperature machines and cooling water circulation systems. Avoid excessive high-temperature shaping for ordinary thin-walled plastic parts, make full use of the natural shrinkage characteristics of raw materials to stabilize product size, and reduce ineffective energy consumption caused by long-term operation of heating and cooling equipment.
III. Mold Structure Improvement and Auxiliary OptimizationBlocked cooling water channels and accumulated scale will lead to slow cooling efficiency and prolonged molding cycles, resulting in increased energy consumption. Regularly clean and pickle mold water channels to ensure smooth cooling water circulation. Adopt conformal water channel layout in new mold design to improve heat exchange efficiency, reduce cooling cycle and lower the operating load of chillers.
Excessive mold fitting clearance and over-deep exhaust grooves are prone to burrs and flash, resulting in additional trimming procedures and repeated machine debugging, which indirectly increase energy consumption. Precisely control the fitting accuracy of parting surfaces, inserts and sliding blocks to reduce flash defects, improve one-time molding yield, and cut secondary processing energy and labor consumption.
IV. Energy Saving Management of Public Engineering System
Implement centralized management of workshop cooling water circulation system. Adjust the number of operating chillers according to seasonal temperature changes, and turn off part of refrigeration equipment in low-temperature seasons to adopt normal-temperature circulating water production. Wrap water pipes with thermal insulation materials to reduce cold and heat exchange loss. Regularly inspect pipeline valves to eliminate water leakage and running water waste, and save dual consumption of water resources and refrigeration energy.
Demolding air blowing, mold cleaning and automated equipment operation in injection workshops consume a large amount of compressed air. Fully investigate and repair air leakage points of air pipe joints, solenoid valves and mold air passages. Reduce invalid air blowing time and air pressure to avoid long-term empty venting. Centrally control the operation time of air compressors, eliminate no-load operation of multiple units, and effectively reduce air station energy consumption.
V. Daily Equipment Maintenance and On-Site ManagementDust and carbon deposits accumulated on screws, material barrels, heating coils and cooling fans for a long time will lead to slow heating efficiency, poor heat dissipation and increased energy consumption. Establish a regular equipment maintenance account to clean dust, oil stains and carbon deposits, and replace aging heating parts and sealing components. Maintain the equipment in the best operating state and reduce additional power consumption caused by equipment aging.
Formulate standardized workshop energy-saving management systems and team assessment rules, clarify the operation specifications of turning off lights, water, equipment and air, and put an end to artificial energy waste. Strengthen staff energy-saving training to standardize daily operating habits. Implement zoning control of workshop lighting and ventilation equipment to avoid long-term full-load operation, and realize long-term and normalized energy-saving production management.
ConclusionMost energy consumption waste in injection molding workshops comes from neglected detail management and redundant parameter settings. The above 12 practical energy-saving measures cover all links of equipment operation, molding process, mold structure, public engineering and personnel management. Through refined control of equipment operation, optimized molding parameters, improved mold cooling structure, standardized water, electricity and gas loss control, and complete daily maintenance system, the overall workshop energy consumption can be effectively reduced. While ensuring product quality and production capacity, it compresses production costs, improves comprehensive production benefits, and realizes green and low-carbon standardized production of injection molding workshops.
