How Can Water-based Mold Temperature Controllers Achieve Water Temperatures of 120°C, 160°C, 180°C, Or Even 200°C To Heat Molds?

In the injection molding industry, water-based mold temperature controllers can raise water temperatures to 120°C, 160°C, 180°C, and even 200°C. Their core principle is to overcome water's boiling point by applying pressure, combined with efficient heating and temperature control systems to achieve stable output. The specific operating mechanism can be broken down into the following three key steps:

1. Core Principle: Pressurizing to Raise Water's Boiling Point

At standard atmospheric pressure (1 atm), the boiling point of water is 100°C. Further heating after reaching this point will only vaporize the water, preventing any further increase in temperature. Water-type mold temperature controllers, on the other hand, directly change the boiling point of water through a closed circulation system combined with pressure control:

• The circulating water circuit within the system is completely sealed, preventing the steam generated during the heating process from escaping, causing the pressure within the circuit to rise in tandem with the temperature.

• According to the laws of physics, pressure and boiling point are positively correlated: higher pressure increases the boiling point (for example, at 0.3 MPa, the boiling point of water is approximately 133°C; at 1.6 MPa, the boiling point can exceed 200°C). This allows water to be heated to the target temperature of 120-200°C while still in its liquid state.

2. Key Components: Ensuring High-Temperature Water Circulation and Temperature Control

To achieve stable high-temperature heating, the water-based mold temperature controller is equipped with targeted core components to prevent system leaks, vaporization, or overheating:

• High-Pressure Circulation Pump: Provides sufficient pressure in the enclosed water circuit, forcing high-temperature water to circulate through the flow channels of the mold temperature controller and the mold, ensuring efficient heat transfer;

• High-Pressure Heating Tube: Made of high-pressure and high-temperature resistant materials (such as stainless steel), it directly heats the water in the enclosed water circuit, preventing damage to the heating element due to high pressure;

• Pressure Control System: Includes components such as a pressure sensor and a safety valve. The pressure sensor monitors the water circuit pressure in real time. If the pressure is too high, the safety valve automatically releases pressure to prevent system rupture. Furthermore, the pressure is adjusted in tandem with the temperature to ensure that the pressure remains consistent as the water temperature rises, preventing premature vaporization of the water.

3. Adapting to Injection Molding Requirements: Precise Temperature Control and Heat Transfer

The injection molding process requires extremely stable mold temperature (temperature fluctuations can cause defects such as sink marks and deformation in plastic parts). Water-based mold temperature controllers, in addition to high-temperature heating, also meet these requirements through the following design features:

• Precision Temperature Control Module: Equipped with a PID controller (Proportional Integral Derivative Controller), it monitors water and mold temperatures in real time, automatically adjusting the heating tube power to keep water temperature fluctuations within ±1°C.

• Efficient Heat Exchange Structure: A flow channel designed within the mold matches the mold temperature controller's water path. High-temperature water circulates rapidly through the flow channel, transferring heat to the mold through heat conduction, ensuring a uniform temperature rise to the target value (e.g., 120°C for ABS parts, 180-200°C for parts made of high-temperature materials such as PA66).