Hot Runner Manifold Temperature Control for Ultra-Thin Resin Molding
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Solution Overview
Problem
Conventional hot runner mold devices are unable to produce ultra-thin annular resin bodies with the required thickness and quality for hydrogen battery separators, as they lack precise temperature control and efficient resin flow management, leading to carbonization issues and suboptimal molding conditions.
Innovation Solution
A hot runner mold device featuring a three-layer stacked structure with temperature control plates and oil flow circuits to maintain the manifold body temperature within a range that prevents carbonization, combined with open nozzles for high-speed resin injection and a specialized alloy for improved thermal conductivity and hardness, ensuring smooth resin flow and precise temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional hot runner mold device is used, then resin flow is maintained, but carbonization occurs due to insufficient temperature control
Solution Approach 1:
The temperature control system is segmented into multiple independent heating zones along the manifold body, each with its own heating element and temperature sensor. This allows different sections of the manifold to be controlled at different temperatures, preventing carbonization in critical areas while maintaining resin flow temperature in other areas.
Solution Approach 2:
Temperature sensors are installed throughout the manifold body to provide real-time feedback to the control system. The control system adjusts heating power based on actual temperature readings, preventing overheating that leads to carbonization while ensuring sufficient heat for resin flow.
2Productivity
If heating is increased to maintain resin flow, then resin flow is improved, but carbonization risk increases
Solution Approach 1:
Different sections of the manifold body are assigned different heating intensities based on their specific functional requirements. Areas closer to injection points receive higher heating to ensure resin flow, while areas farther away or in dead zones receive lower heating to prevent carbonization.
3Weight of moving object
If mold thickness is reduced for weight reduction, then weight decreases, but molding precision becomes difficult to achieve
Solution Approach 1:
The manifold and nozzle system is pre-heated to optimal temperatures before resin injection begins. Temperature is maintained throughout the molding process to ensure consistent resin flow and cooling rates, which is critical for achieving precise thickness control in ultra-thin parts.
Solution Approach 2:
Processing parameters such as injection pressure, injection speed, and holding pressure are optimized specifically for ultra-thin wall sections. The temperature profile is adjusted to match the reduced thickness, ensuring proper filling and cooling without causing defects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables the successful molding of ultra-thin annular resin bodies with high quality and precise thickness, addressing the limitations of conventional devices by preventing carbonization and ensuring efficient resin flow, thus meeting the demands for weight reduction and size minimization in hydrogen battery separators.
Implementation Method 1
a heater (40d) provided in the manifold body (40a) together with the runner flow path (40c) to heat the manifold body (40a)
Implementation Method 2
both side temperature control plates stacked on the manifold body from both surfaces, and both side oil flow circuits included respectively in the both side temperature control plates, the both side oil flow circuits flowing oil at an oil temperature within a predetermined oil temperature range suitable for preventing carbonization of the molten resin to control a temperature of a portion including at least the runner flow path of the manifold body heated by the heater to a temperature suitable for preventing the carbonization of the molten resin through the both side temperature control plates
Data Source
Figure 1
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AI summary
Upper and lower temperature control plates of upper and temperature control plate members (50a, 50b) are attacked so as to interpose a manifold body (40a) of a manifold (40) therebetween. Upper and lower oil flow circuits provided in the respective upper and lower temperature control plates control the temperature of the manifold body (40a) heated by a plurality of coil heaters to a temperature suitable for preventing carbonization of a molten resin flowing in a flow-dividing type flow path (40c) of the manifold body (40a).