Polymer Processing Mold for Surface Porosity Without Shear Loss
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Solution Overview
Problem
Introducing porosity into polymer surfaces can weaken mechanical properties, limiting its application due to a loss in shear strength.
Innovation Solution
A method and apparatus for creating a porous surface on a polymer by displacing a porogen through the polymer surface at a temperature below its melting point, using a mold, pressure, and heat to form a matrix layer integrally connected with the polymer, followed by removing the porogen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If porosity is introduced into polymer surfaces, then friction and tissue integration are enhanced, but mechanical strength and shear strength are weakened
Solution Approach 1:
The patent applies local quality by creating porosity only in the surface layer of the polymer while keeping the bulk material dense and intact. This is achieved by placing porogen particles only on the surface and applying uniaxial pressure to displace them into the polymer matrix, resulting in a porous surface layer with enhanced friction and tissue integration properties while maintaining the mechanical strength of the underlying solid polymer structure.
Solution Approach 2:
The patent segments the polymer structure into two distinct zones: a porous surface layer and a solid bulk material. The porous layer is created by displacing porogen particles into the polymer matrix under uniaxial pressure, while the bulk material remains unaffected and maintains its full mechanical properties. This segmentation allows the surface to provide enhanced friction and tissue integration while the bulk provides structural support.
2Adaptability or versatility
If porosity is introduced into polymer surfaces, then tissue integration is improved, but mechanical integrity is compromised
Solution Approach 1:
The patent applies local quality by creating porosity only in the surface layer of the polymer while keeping the bulk material dense and intact. This is achieved by placing porogen particles only on the surface and applying uniaxial pressure to displace them into the polymer matrix, resulting in a porous surface layer with enhanced friction and tissue integration properties while maintaining the mechanical strength of the underlying solid polymer structure.
Solution Approach 2:
The patent uses preliminary action by first placing porogen particles on the polymer surface before applying uniaxial pressure. This preliminary placement ensures that the porogen particles are positioned correctly for displacement into the polymer matrix, creating a controlled porous structure that enhances tissue integration while preserving mechanical integrity through the subsequent pressure application process.
3Manufacturing precision
If uniaxial pressure is applied to displace porogen, then a controlled porous layer is formed, but processing complexity increases
Solution Approach 1:
The patent replaces complex multi-axial pressure systems with a simpler uniaxial pressure application system. By applying pressure in only one direction, the process achieves controlled porous layer formation without requiring complex multi-directional pressure control mechanisms, thereby reducing processing complexity while maintaining manufacturing precision.
Solution Approach 2:
The patent uses parameter changes by controlling the magnitude and duration of uniaxial pressure to achieve precise control over porous layer formation. By adjusting pressure parameters, the process optimizes porogen displacement into the polymer matrix, creating a controlled porous structure without requiring complex processing equipment, thus balancing manufacturing precision with reduced processing complexity.
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 process maintains mechanical integrity while creating a porous layer, enhancing friction and tissue integration without compromising the polymer's strength.
Implementation Method 1
maintaining, via a heating element located along the predetermined path, throughout the heating and displacing steps, a temperature of the surface of the solid body that is below the melting temperature by at least the melting temperature differential
Implementation Method 2
applying pressure via a press to the solid body of material for displacing the porogen through the surface by a defined distance
Implementation Method 3
creating, thereby, a matrix layer including the material and the porogen in the solid body of material, the matrix layer being integrally connected with the solid body of material
Data Source
AI summary
In general, in various embodiments, the present disclosure is directed systems and methods for producing a porous surface from a solid piece of polymer. In particular, the present disclosure is directed to a mold for processing a material. The mold includes a body having a top surface and a bottom surface. A void within the body is configured to receive a porogen and a piece of thermoplastic material. The void extends in a top to bottom direction to form a non-through cavity with a cavity surface that is substantially parallel to the bottom surface of the body. A protrusion on the body extends from the cavity surface towards the top surface. The void extends at least halfway through the body towards the bottom surface. A peg is disposed on the body and shaped to matingly engage a weight via a hole within the weight.