Gradient Heating and Cooling Platens for Composite Panel Consolidation
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Solution Overview
Problem
The challenge is to reduce energy expenditure for consolidating mats of materials while ensuring maximum production rate without thermally damaging outer surface layers during the process, which typically involves heating plastic and paper fragments in a hot press.
Innovation Solution
A method using a continuous hot press with a gradient of heating power values and a continuous cold press with a gradient of cooling power values, where the heating power and cooling power are maintained constant through high flow rates of heated oil and chiller fluid, respectively, to achieve efficient heat transfer and minimize energy waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high heating power is applied to the press to achieve rapid consolidation, then productivity is improved, but the outer surface layers may be thermally damaged (melted, shrank, charred)
Solution Approach 1:
The press is divided into multiple heating zones with different heating power levels. The first heating zone applies higher heating power for rapid initial consolidation, while the second heating zone applies lower heating power to complete the consolidation without causing thermal damage to the outer surface layers. This spatial segmentation of heating functions resolves the contradiction between speed and thermal protection.
Solution Approach 2:
Different regions of the press are assigned different heating power characteristics. The initial heating region uses high power density to achieve rapid bond formation, while the subsequent heating region uses lower power density to avoid overheating. This local differentiation of heating quality allows the system to achieve both rapid consolidation and thermal protection in different spatial locations.
2Loss of time
If high heating power is used to achieve rapid consolidation, then consolidation time is reduced, but energy consumption increases
Solution Approach 1:
The heating process is segmented into two distinct phases with different power levels. The first phase uses high heating power for a short duration to achieve rapid initial consolidation and bond formation. The second phase uses lower heating power to complete the consolidation process. This temporal and spatial segmentation of heating power reduces total energy consumption compared to using high power throughout the entire consolidation time.
Solution Approach 2:
The heating process employs periodic variation in power intensity, with an initial high-power period for rapid consolidation followed by a lower-power period for completion. This periodic action pattern optimizes the balance between consolidation speed and energy efficiency by applying high energy input only when most needed.
3Productivity
If the mat is cooled quickly to maintain production rate, then productivity is improved, but excessive cooling power may cause thermal stress
Solution Approach 1:
The cooling process is divided into multiple cooling zones with progressively decreasing cooling power. The first cooling zone applies higher cooling power to quickly reduce the temperature and maintain production rate. The second cooling zone applies lower cooling power to complete the cooling process gradually, avoiding thermal stress and structural damage. This spatial segmentation of cooling functions resolves the contradiction between speed and structural integrity.
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
This approach allows for faster bond formation with minimal energy usage, avoiding excess heat absorption and enabling quicker cooling of the mat, thus reducing overall energy consumption and maintaining the integrity of the outer surface layers.
Implementation Method 1
a first pair of heating platens (top and bottom), and a second pair of heating platens (top and bottom)... wherein a heating power of the first pair of heating platens is greater than a heating power of the second pair of heating platens
Implementation Method 2
a first pair of cooling platens and a second pair of cooling platens... wherein a cooling power of the first pair of cooling platens is greater than a cooling power of the second pair of cooling platens
Data Source
AI summary
A method may include forming a mat including paper fragments, plastic fragments, and top and bottom outer surface layers, wherein the outer surface layers have maximum processing temperature values and consolidating the formed mat in a continuous hot press including three pairs of opposing top and bottom heating platens. A first pair of heating platens has a first heating power. A second pair of heating platens has a second, lower heating power. A third pair of heating platens has a third, even lower heating power. The method may include consolidating the formed mat in a continuous cold press including three pairs of opposing top and bottom heating platens. A first pair of cooling platens has a first cooling power. A second pair of cooling platens has a second, lower cooling power. A third pair of cooling platens and has a third, even lower cooling power.