Foamed Polymer Core Thickness Control in Steel Belt Press
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Solution Overview
Problem
The manufacture of wall or floor panels with foamed cores using double belt presses often results in uneven foaming due to high pressures, which can rupture foam cells and reduce the strength of the foam.
Innovation Solution
A method where polymer powder layers, including foamable polymer powder, are foamed between conveyor belts in a steel belt press, ensuring that the total thickness at the outlet is equal to or greater than the opening of the steel belt press, minimizing mechanical pressure and allowing for even foaming within the defined space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high pressure is applied during foaming in a double belt press, then the foam cells are compressed and may rupture, but the foaming process can be controlled more effectively
Solution Approach 1:
The patent changes the pressure parameter from high to low during the foaming process. By using low pressure and allowing the foam to expand freely within the defined space between conveyor belts, the integrity of foam cells is preserved while achieving uniform foaming throughout the substrate.
Solution Approach 2:
The patent applies preliminary action by defining the space between conveyor belts before foaming occurs. The opening of the steel belt press is carefully selected to be equal to or greater than the total thickness at the outlet, pre-establishing the boundaries within which the foam can expand uniformly without requiring subsequent compression.
2Manufacturing precision
If the opening of the steel belt press is reduced to control foaming, then foam uniformity improves, but the process becomes more constrained and complex
Solution Approach 1:
The patent simplifies the device configuration by changing the approach from active compression control to passive space definition. Instead of using complex mechanisms to apply and control high pressure, the opening dimension of the steel belt press is simply set to be equal to or greater than the required thickness, allowing foam to expand naturally.
Solution Approach 2:
The patent inverts the conventional approach by not trying to compress the foam to control its dimensions. Instead, the space is pre-defined to accommodate the expected foam expansion, and the foam is allowed to fill this space naturally, achieving uniformity through the absence of constraining forces rather than through active control.
3Manufacturing precision
If additional mechanical pressure is applied after foaming to achieve desired thickness, then dimensional accuracy improves, but foam strength deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and setting the opening dimension of the steel belt press to be equal to or greater than the total thickness at the outlet. This preliminary configuration eliminates the need for subsequent compression steps, as the foam expands to fill the pre-defined space, achieving both thickness control and foam integrity simultaneously.
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 method produces a more uniform and even foamed core without the need for additional mechanical pressure, enhancing the strength and consistency of the foam structure.
Implementation Method 1
one or more layers of polymer powder comprising at least one foamable polymer powder are foamed at least partially onto a substrate between two conveyor belts of a double belt press in the forming zone
Data Source
AI summary
A method for making a floor or wall panel has a foamed polymer core. A foamable polymer powder is foamed between two conveyor belts in the forming zone of a steel belt press. The sum of the thicknesses of the two conveyor belts and the total thickness of the layers at the entrance of the steel belt press is less than or equal to the opening of the steel belt press at the entrance of the steel belt press. The sum of the thicknesses of the two conveyor belts and the total thickness of the substrate at the outlet of the steel belt press is equal to the opening of the steel belt press at the outlet of the steel belt press and greater than the sum of the thicknesses of the two conveyor belts and the total thickness of the layers at the entrance of the steel belt press.