Porous Thermoplastic Core Adhesion via Powder Particle Size
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Solution Overview
Problem
Existing composite articles with porous thermoplastic core layers and powder coated layers face challenges in achieving substantial adhesion and precise control over adhesive layer thickness, particularly in automotive and building materials applications where structural and aesthetic performance are critical.
Innovation Solution
A thermoplastic composite article comprising a porous core layer with reinforcing fibers and a powder coated layer, where the average particle size of the powder is selected to create an interface between the two layers, ensuring that substantially all powder remains above the interface, thereby enhancing adhesion and allowing for precise control over the adhesive layer thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a powder coated layer is applied to a porous thermoplastic core layer, then adhesion between layers is improved, but powder penetration into the porous core layer occurs causing loss of substance and reduced manufacturing precision
Solution Approach 1:
The patent utilizes a porous thermoplastic core layer with controlled porosity (10-50% open cell structure) that allows the powder coated layer to be applied while maintaining adhesion. The porous structure provides surface area for bonding while the controlled pore size prevents excessive powder penetration, thus balancing adhesion improvement with substance loss reduction.
Solution Approach 2:
The patent applies thermal energy to melt the thermoplastic material in the core layer, which changes the physical state and enables the powder coated layer to adhere properly. By controlling the temperature parameters during processing, the patent optimizes adhesion while minimizing powder penetration into the core layer.
2Manufacturing precision
If powder particle size is reduced to improve adhesion, then manufacturing precision is improved, but powder penetration into the porous core layer increases causing loss of substance
Solution Approach 1:
The patent specifies powder particle sizes in the range of 50-200 micrometers, optimizing the balance between adhesion and penetration control. This parameter selection ensures sufficient adhesion while preventing excessive penetration into the porous core layer, thus maintaining manufacturing precision without significant substance loss.
Solution Approach 2:
The controlled porosity of the core layer (10-50% open cell structure) works in conjunction with the optimized powder particle size to prevent excessive penetration. The porous structure provides adequate surface area for adhesion while the controlled pore dimensions, combined with appropriate particle sizing, limit powder penetration and maintain manufacturing precision.
3Strength
If the powder coated layer penetrates into the porous core layer, then adhesion is improved, but the thickness of the adhesive layer cannot be controlled with precision
Solution Approach 1:
The patent controls processing temperature and powder application parameters to achieve optimal adhesion while maintaining precise control over adhesive layer thickness. By carefully managing these parameters, the patent ensures that the powder coated layer adheres properly without uncontrolled penetration that would compromise thickness precision.
Solution Approach 2:
The controlled porosity of the core layer provides a balance between adhesion and thickness control. The open cell structure (10-50% porosity) allows for sufficient bonding surface area while the controlled pore dimensions prevent uncontrolled powder penetration, thus maintaining adhesive layer thickness precision while achieving adequate adhesion.
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 provides enhanced adhesion, reduced cost, and lighter weight, while allowing for precise control over the adhesive layer thickness, meeting stringent performance specifications in automotive and building materials applications.
Implementation Method 1
enhancing adhesion and allowing for precise control over the adhesive layer thickness
Data Source
AI summary
Composite articles comprising a porous prepreg or core layer and a powder coated layer thereon are described. In some instances, a thermoplastic composite article comprises a porous core layer comprising a web of reinforcing fibers held together by a thermoplastic material, and a powder coated layer disposed on the porous core layer, in which a particle size of the powder coated layer is selected to provide an interface between the powder coated layer and the porous core layer, wherein at least 50% by weight of the disposed powder coated layer is present above the interface.