Blended Wood Door Jamb Composite Structure
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Solution Overview
Problem
Existing exterior door jambs face challenges in achieving optimal strength and durability while minimizing material waste and distortion, particularly in using wood materials that are prone to warping and twisting.
Innovation Solution
A dual-layered door jamb assembly comprising a backing layer of engineered wood material, such as thermoplastic, and a facing layer of wood material, like laminated veneer lumber, bonded together with adhesive, providing superior screw pull strength and dimensional stability, and optionally a third layer for additional support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solid wood material is used for door jambs, then natural appearance and workability are improved, but warping and twisting occur due to moisture absorption
Solution Approach 1:
The patent applies composite materials by combining a wood veneer layer with a thermoplastic backing layer. The wood veneer provides natural appearance and workability, while the thermoplastic backing layer resists moisture absorption and dimensional changes. This composite structure resolves the contradiction by allowing the wood layer to maintain its aesthetic and machining properties while the thermoplastic layer prevents warping and twisting.
Solution Approach 2:
The patent applies local quality by giving different layers different properties: the wood veneer layer provides surface aesthetics and workability where needed, while the thermoplastic backing layer provides moisture resistance and dimensional stability where required. Each layer is optimized for its specific function, resolving the contradiction between workability and dimensional stability.
2Stability of the object's composition
If thermoplastic material is used for door jambs, then moisture resistance and dimensional stability are improved, but screw pull strength is insufficient
Solution Approach 1:
The composite structure combines thermoplastic material with a wood veneer layer. The thermoplastic provides moisture resistance and dimensional stability, while the wood veneer layer provides superior screw pull strength. This resolves the contradiction by allowing each material to contribute its strengths: thermoplastic for stability and wood for fastening capability.
3Stability of the object's composition
If thick solid wood is used to prevent warping, then dimensional stability is improved, but material waste increases and shipping costs rise
Solution Approach 1:
The patent uses a thin wood veneer layer bonded to a thermoplastic backing layer, rather than requiring thick solid wood. This composite construction achieves dimensional stability through the thermoplastic layer's moisture resistance while using minimal wood material, thereby reducing material waste and associated shipping costs.
Solution Approach 2:
The patent transitions from using thickness (one dimension) to achieve stability to using a layered composite structure (multiple dimensions). Instead of increasing wood thickness to prevent warping, the solution uses a multi-layer construction where the thermoplastic backing layer provides dimensional stability, allowing thin wood veneer usage and reducing material waste.
4Stability of the object's composition
If thick solid wood is used to prevent twisting, then dimensional stability is improved, but manufacturing complexity and shipping costs increase
Solution Approach 1:
The composite of wood veneer and thermoplastic backing provides dimensional stability without requiring thick wood sections. This reduces manufacturing complexity compared to working with thick solid wood, as the thermoplastic layer can be manufactured with consistent properties and bonded to the veneer, simplifying the overall manufacturing process.
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 enhances the strength and stability of door jambs, reduces material waste, and minimizes distortion, while allowing for efficient local production and reduced shipping costs, improving the overall performance and manufacturing efficiency of exterior door jambs.
Implementation Method 1
bonded together with adhesive
Data Source
AI summary
A blended trim molding assembly can include a first layer of engineered wood material (e.g., thermoplastic) having a first, generally rectangular cross-sectional thickness, and a second layer of wood material (e.g., lumber, particle board, fiberboard) having a second, generally rectangular cross-sectional thickness. The second layer of wood material is joined (e.g., glued) to the first layer of engineered wood material/thermoplastic at a planar interface. Together, the first and second layers have a total thickness. The blended trim molding assembly may also include a third layer of wood material having a third, generally rectangular cross-sectional thickness, where the third layer of wood material is joined to the first layer of engineered wood material/thermoplastic at a second planar interface opposite the planar interface.