An injection molding cooling water system is an industrial closed-loop recirculating cooling system that uses cooling water within the range of 20°C ~ 30°C as a medium to cool equipment or processes. Its fundamental operational characteristic is temperature reduction control. Essentially, it is understood as a system where cooling water absorbs heat from the load equipment it flows through, then dissipates this heat via cooling units (chillers) before being recirculated. When exploring the comprehensive utilization of thermal energy within the cooling water system, hardware solutions such as installing plate heat exchangers and heat pump units within the cooling network can enable heat recovery and reuse. However, the actual equipment investment and economic return must be carefully considered. In the field of air conditioning, the recovered heat can theoretically be supplied for space heating. This is feasible, especially in winter when a large portion, or even all, of the heat could potentially be utilized. However, there are two major prerequisites regarding system scale: 1. The installed capacity must be sufficiently large, and 2. The amount of heat available for exchange must be substantial. Regarding process temperature requirements: the cooling water exchange must meet the temperature demands of the injection molding process. Nevertheless, a significant drawback exists. The period when the industrial cooling water system has its peak cooling demand coincides precisely with the period when the air conditioning system also has its peak cooling demand. Using the systems interconnectedly during these peak periods would increase the required installed capacity of both the refrigeration equipment (chillers) and the cooling units. Therefore, the value of such integration must be critically assessed. Secondly, utilizing the heat for air conditioning heating introduces a new problem. The industrial cooling water system is a constant-temperature system. When its temperature reaches the control target, the heat exchange from the air conditioning’s heat pump system must be stopped. This frequently leads to situations in practical application where there is no heat available for the heat pump to recover. Consequently, when selecting air conditioning units, the electrical heating power of the auxiliary heating function in the fan coil units cannot be reduced at all. For systems where the overall recoverable heat is limited, the utilization rate of the recovered heat is low, and the economic return is negligible. Thirdly, integrating the air conditioning units into this heat recovery scheme does not reduce the investment in the core unit equipment. All necessary units (chillers for cooling, heat pumps for heating) must still be installed. It is recommended that clients assess the necessity of heat exchange between the cooling water system and the air conditioning system based on their actual operational demands and current situation.

In the injection molding industry, the cooling water system comprises two distinct components: “​​Equipment Cooling Water​​” and “​​Process Cooling Water​​.” Together, they form a comprehensive system, but serve different functions and applications: 1. ​​Equipment Cooling Water​​ • ​​Function:​​ Primarily cools critical injection molding machine components like the hydraulic system, motors, screw, and barrel to prevent overheating, damage, or reduced efficiency. • ​​Application Targets:​​ ◦ Hydraulic Oil Cooler: Prevents excessive hydraulic oil temperature, ensuring stable system operation. ◦ Motors & Drives: Prevents motor overheating, extending equipment lifespan. ◦ Screw & Barrel: Controls temperature during plasticization, preventing material degradation. • ​​Characteristics:​​ ◦ Requires relatively low water temperature, typically near or slightly below ambient. ◦ Requires stable flow rate and pressure for consistent, efficient machine operation. 2. ​​Process Cooling Water​​ • ​​Function:​​ Primarily cools the mold and the molded product itself, ensuring product quality and production efficiency. • ​​Application Targets:​​ ◦ Mold Cooling: Circulates through channels within the mold to precisely control mold temperature, enabling rapid and uniform cooling. ◦ Product Cooling: Directly affects dimensional stability, surface quality, and internal stress distribution of the final part. • ​​Characteristics:​​ ◦ Water temperature requires precise regulation based on material and product requirements. ◦ Flow rate and pressure require careful design to ensure uniform cooling across all mold sections. 3.​​The Integrated Cooling Water System​​ In practice, injection molding plants often utilize a ​​single, integrated cooling water circulation system​​ that supplies both equipment cooling water and process cooling water. Distribution and control are managed through separate piping circuits and control units. ​​Advantages:​​ • ​​Resource Consolidation:​​ Shared water source and circulation reduce equipment investment and operating costs. • ​​Efficient Management:​​ Centralized control allows unified monitoring and adjustment of both cooling loops. • ​​Energy Efficiency & Sustainability:​​ Water recycling minimizes waste and environmental impact. 4. ​​Key System Control Parameters​​ Both equipment and process cooling loops require precise control of these parameters: • ​​Temperature:​​ Adjusted according to equipment and process specifications. • ​​Flow Rate:​​ Ensures sufficient water supply to prevent localized overheating. • ​​Pressure:​​ Maintains stable pressure for effective heat transfer. • ​​Water Quality:​​ Requires regular maintenance (e.g., descaling, filtration) to prevent blockages and corrosion. ​​Summary:​​ The injection molding cooling water system is an ​​integrated entity​​ combining Equipment Cooling Water and Process Cooling Water. They work synergistically to ensure machine efficiency and product quality stability. Optimizing design and management of this system enhances production efficiency and product quality while reducing energy consumption and operational costs.

Industrial cooling water systems maintain precise, constant water temperatures based on production process requirements. The rapid advancement in rubber and plastic molding places increasingly high demands on the accuracy of cooling water temperature control. Precision injection molding generates a growing need for rapid mold cooling. However, the reality is that the use of room-temperature cooling water remains widespread in many injection molding factories, with many believing it is sufficient. While room-temperature industrial cooling water is extensively used in industrial production, precision injection molding sets very high requirements for the development of the rubber and plastic molding field. The following are the three most significant drawbacks of room-temperature cooling water in precision injection molding production: ​​Limited Cooling Efficiency:​​ Cooling effectiveness is impacted by ambient temperature, unable to meet high-precision or rapid cooling demands. ​​Imprecise Temperature Control:​​ Difficulty achieving precise temperature control, making it unsuitable for temperature-sensitive processes. ​​Susceptibility to Environmental Influence:​​ Cooling performance significantly degrades in high-temperature or high-humidity environments. Low-temperature chilled water enables precise and constant cooling temperature control, offering the following crucial benefits in precision injection molding: 1. ​​Enhances Product Quality:​​ • ​​Reduces Deformation:​​ Rapid cooling minimizes internal stresses, reducing warpage and deformation. • ​​Improves Surface Finish:​​ Accelerated cooling helps minimize surface defects like sink marks and flow lines, resulting in a smoother finish. 2. ​​Shortens Production Cycle:​​ • ​​Accelerates Cooling:​​ Low-temperature chilled water rapidly extracts heat from the mold, reducing cooling time and boosting production efficiency. • ​​Increases Output:​​ Reduced cooling time leads to higher production volume per unit time. 3. ​​Optimizes Material Properties:​​ • ​​Controls Crystallinity:​​ For crystalline materials, low-temperature chilled water regulates crystallinity, improving mechanical properties. • ​​Stabilizes Dimensions:​​ Rapid cooling promotes dimensional stability, minimizing the need for secondary operations. 4. ​​Extends Mold Lifespan:​​ • ​​Reduces Thermal Fatigue:​​ Lower temperature fluctuation within the mold minimizes thermal fatigue, extending mold service life. • ​​Prevents Overheating:​​ Avoids excessive mold temperatures, lowering the risk of damage. 5. ​​Reduces Energy Consumption:​​ • ​​Lowers Energy Use:​​ Shortened injection cycle due to faster cooling reduces overall energy consumption. • ​​Improves Resource Utilization:​​ Decreased scrap rates enhance material utilization. 6. ​​Accommodates Complex Structures:​​ • ​​Enhances Detail Replication:​​ Low-temperature chilled water aids in the precise molding of intricate details and complex geometries. ​​ In summary,​​ low-temperature chilled water in precision injection molding significantly improves product quality, shortens production cycles, optimizes material performance, extends mold life, saves energy, and enables the production of complex structures.