Composite Large Fabrication Molds for Thermal Stability
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Solution Overview
Problem
Molds for manufacturing large plastic articles face challenges with thermal and mechanical resistance, leading to deformation and dimension changes during heating and cooling cycles, affecting reproducibility.
Innovation Solution
A mold composition comprising polyarylsulfones, poly(etherimides), and reinforcing carbon fillers provides enhanced thermal and mechanical resistance, using melt fabrication techniques like injection molding and additive manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal is used for large molds, then thermal and mechanical resistance is improved, but weight increases and ease of manufacture decreases
Solution Approach 1:
The patent applies composite materials by combining polyarylsulfone polymer with carbon fiber reinforcement and ceramic particles. This composite structure provides metal-like thermal and mechanical resistance while maintaining the inherent advantages of polymer materials including lower weight and easier manufacturing through conventional plastic molding techniques
2Strength
If metal is used for large molds, then mechanical resistance is improved, but ease of manufacture decreases
Solution Approach 1:
The composite material system combines polyarylsulfone with carbon fibers and ceramic particles to achieve metal-level mechanical strength. This enables the mold to be manufactured using conventional plastic molding processes rather than complex metal fabrication methods
Solution Approach 2:
The patent modifies the thermal and mechanical parameters of polymer materials through compositional changes (adding reinforcements and fillers) to achieve performance levels previously only attainable with metals, thereby enabling easier manufacturing
3Temperature
If the mold is heated for molding, then the molding process is enabled, but deformations and dimension changes occur during cooling
Solution Approach 1:
The composite material composition including polyarylsulfone, carbon fiber, and ceramic particles provides high dimensional stability during thermal cycles. The ceramic particles and carbon fibers act as thermal stabilizers that minimize expansion and contraction, preventing warpage and maintaining manufacturing precision
Solution Approach 2:
The patent addresses thermal expansion by incorporating materials with low thermal expansion coefficients (ceramic particles and carbon fibers) into the polymer matrix, creating a composite that resists dimensional changes during heating and cooling cycles
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 mold composition achieves high heat deflection temperature and mechanical strength, ensuring minimal warpage and reproducibility for large plastic articles.
Implementation Method 1
a reinforcing carbon filler
Implementation Method 2
high heat deflection temperature
Data Source
AI summary
A mold for the molding of large articles is provided, said mold comprising at least one molding surface for receiving the material to be molded and which comprises at least one polyarylsulfone polymer, selected from poly(ethersulfone) and poly(biphenylsulfone), at least one poly(etherimide) polymer and a reinforcing carbon filler. The mold has good mechanical and thermal resistance properties.