Multi-Gradient Foamed Polymer Processing via Topological Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing foamed polymeric materials are limited to single gradients, resulting in less-foamed layers internally and more-foamed layers externally, and using multiple materials complicates recycling.
Innovation Solution
A process combining topological optimization software with variable pressure profiles over time and space to create multi-gradient foamed polymeric materials, ensuring uniform density and morphology gradients without the need for multiple materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If constant pressure and temperature conditions are used during solubilization, then the process is simple to control, but only single gradient foamed structures can be obtained
Solution Approach 1:
The patent applies dynamics by transitioning from static constant pressure/temperature conditions to dynamic variable pressure profiles during the solubilization process. The pressure is varied over time and space to create different foaming agent concentration distributions, enabling multiple gradient structures (single gradient, multi-gradient, stratified) from a single process system. This resolves the contradiction by making the previously static process dynamic and adaptable.
Solution Approach 2:
The patent implements parameter changes by systematically varying pressure and temperature parameters during solubilization to achieve different foaming outcomes. By changing pressure profiles (increasing, decreasing, or maintaining constant) and temperature conditions, the process can produce diverse gradient structures using the same basic equipment, thus improving versatility without proportionally increasing device complexity.
2Reliability
If multiple materials with different rigidities are used to meet performance requirements, then functional requirements can be satisfied, but recycling becomes difficult
Solution Approach 1:
The patent applies local quality by creating spatial variations in foam density and cell structure within a single homogeneous material. Through variable pressure solubilization, different regions of the foam product achieve different densities and mechanical properties (rigidity, strength) tailored to local functional requirements. This eliminates the need for assembling multiple different materials while maintaining performance requirements, and the single-material composition enables easier recycling.
Solution Approach 2:
The patent creates composite-like structures within a single material system by producing foams with heterogeneous density distributions and cell morphologies. The resulting multi-gradient foam acts as a functional composite where different regions provide different mechanical properties, but the entire structure consists of one base material, preserving recyclability while meeting diverse performance requirements.
3Manufacturing precision
If longer solubilization time is used to reach uniform concentration, then uniform foaming is achieved, but internal portions remain less foamed
Solution Approach 1:
The patent applies dynamics by implementing time-dependent pressure profiles during solubilization. Instead of maintaining constant pressure, the pressure is varied over time to control the diffusion and distribution of the foaming agent. This dynamic approach allows achieving uniform or desired non-uniform concentration distributions in shorter times by optimizing the pressure evolution pattern, resolving the time-uniformity contradiction.
Solution Approach 2:
The patent employs periodic action through cyclic or staged pressure variations during solubilization. By applying pressure in stages or using periodic pressure pulses, the process enhances the penetration and distribution of the foaming agent throughout the material, achieving more uniform concentration profiles faster than continuous constant pressure would allow.
Data Source
AI summary
A process for manufacturing products made of foamed polymeric material, comprising the following steps: generating, via software, a virtual model (M) of a product to be manufactured in a solid foamable polymeric material; performing a topological optimization via software of the virtual model (M) in order to obtain an optimized virtual model (MO) with areas of differentiated relative density; preparing the foamable polymeric material and inserting it in a mold (1); solubilizing, under pressure, at least one foaming agent in the foamable polymeric material placed in the mold (1) with a pressure profile of the foaming agent variable over time and/or space as a function of the topological optimization; releasing the pressure in order to obtain a product (S) made of foamed polymeric material provided with the above-mentioned areas of differentiated relative density; removing the product (S) made of foamed polymeric material from the mold (1).