Extruded Composite Core Injection for Strength and Stability
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Solution Overview
Problem
Existing extruded composite building materials lack the strength to compete with wood-based structures, requiring additional support and facing issues like delamination due to chemical and physical incompatibility between core and structural materials, which limits their load-bearing capacity and stability.
Innovation Solution
Incorporating a tailored conformable core material with a specific coefficient of thermal expansion (CTE) into the extruded member, which is injected around internal structural support members during the extrusion process, enhancing load-bearing capacity, stability, and overall strength while reducing material costs and improving thermal insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a core material is incorporated into the extruded member to increase strength, then the load-bearing capacity is improved, but delamination occurs due to chemical and physical incompatibility between core and structural materials
Solution Approach 1:
The patent applies parameter changes by carefully selecting and adjusting the coefficient of thermal expansion (CTE) of the core material to match the structural material. This parameter matching prevents differential thermal expansion and contraction that would cause delamination, while still allowing the core material to provide enhanced load-bearing capacity and structural integrity.
Solution Approach 2:
The patent employs composite materials by combining the structural material with a specifically engineered core material that has compatible CTE properties. This composite structure integrates two materials with different functions: the structural material provides the outer framework while the core material provides internal support, and their compatibility ensures they work together without delamination.
2Strength
If a tailored conformable core material with specific CTE is injected into the extruded member, then the strength and stability are increased, but the manufacturing process complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-determining and selecting a core material with a specific CTE that matches the structural material before the extrusion process begins. This pre-selection eliminates the need for complex real-time adjustments during manufacturing, as the material compatibility is established in advance, simplifying the overall manufacturing process while ensuring strength and stability.
Solution Approach 2:
The patent uses parameter changes by specifying a particular CTE value for the core material that matches the structural material. This parameter specification guides material selection and ensures compatibility, transforming a potentially complex material matching problem into a straightforward selection process based on a single critical parameter.
3Strength
If wood particles are added to plastic to improve stiffness and mechanical properties, then the strength is increased, but the wood particles are susceptible to rot, fungal attack, and moisture absorption
Solution Approach 1:
The patent applies this principle by replacing organic wood particles with an inorganic or synthetic core material that does not rot or suffer from fungal attack. The core material serves the structural function temporarily during the product's service life but is inherently resistant to degradation, effectively eliminating the 'short-living' aspect while maintaining the strength benefits.
Solution Approach 2:
The patent uses composite materials by substituting the wood-plastic composite approach with a different composite structure: a synthetic or inorganic core material embedded within or alongside the plastic structural material. This alternative composite configuration achieves similar mechanical property enhancements while eliminating the biological degradation issues associated with wood particles.
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 method significantly increases the strength and stability of extruded composite materials, allowing them to compete with wood-based structures, reduces material costs, and enhances thermal insulation by tailoring the CTE of the core material to match the structural material, thereby improving mechanical properties and reducing shear stresses caused by thermal cycling.
Implementation Method 1
An extrusion process is one of the most economic methods of manufacturing to produce engineering structural materials
Implementation Method 2
tailoring the CTE of the core material to match the structural material, thereby improving mechanical properties and reducing shear stresses caused by thermal cycling
Data Source
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AI summary
This invention relates to extruded composite materials specifically focusing on the increasing load bearing capacity and the overall strength of composites. Injectable conformable structural core materials are used to replace foam cells inside extruded composite materials thereby increasing the overall load bearing stability and strength. The core materials are tailored to have a desired CTE with respect to the structural materials. The core materials may also incorporate fibers and solid structural fillers for increasing the strength of the composite member. The objective is to enable composite materials to have the highest structural load bearing capability possible so that these technologies can be used as the replacement of wood, in aerospace applications and for other purposes.