Powder Molding Process with Conductive Mold Thermal Control
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Solution Overview
Problem
Existing processes for molding objects from powdered materials, such as expanded polystyrene, face challenges with structural collapse under impact, inefficient heating and cooling, material compaction, and surface finishing issues, which affect the quality and reliability of the molded products.
Innovation Solution
A process using minuscule plastic particles (microspheres) with a specialized molding technique involving electrostatic stabilization, rapid heating and cooling using conductive molds, and controlled fluid injection for extraction, along with surface coating to prevent residue and enable smooth finishing, allows for the creation of high-performance impact-absorbing materials with controlled density and multi-density structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional molding processes are used with expanded polystyrene, then production is simple, but the material collapses under impact and lacks structural integrity
Solution Approach 1:
The patent changes the physical parameters of the molding process by heating the mold to 140-160°C to solidify the microspheres and control their expansion, creating a rigid structure that maintains structural integrity under impact while managing the complexity through controlled thermal processing
Solution Approach 2:
The patent uses a composite material system consisting of minuscule plastic particles (microspheres) combined with a binding agent, creating a multi-component material that provides both impact resistance and structural stability, resolving the contradiction between reliability and ease of manufacture
2Productivity
If heating and cooling systems are added to the mold, then production cycle time is reduced, but device complexity increases
Solution Approach 1:
The patent implements periodic heating and cooling cycles through fluid circuits in the mold, rapidly transitioning between temperature states to solidify and then cool the molded material, dramatically reducing production cycle time from hours to minutes while managing complexity through standardized thermal control systems
Solution Approach 2:
The patent uses hydraulic or pneumatic fluid circuits to transfer heat rapidly through the mold, enabling fast heating and cooling cycles that shorten production time while using well-established fluid control technology to manage system complexity
3Productivity
If material is inserted quickly into the mold, then productivity increases, but material compaction occurs causing molding flaws
Solution Approach 1:
The patent applies preliminary electrostatic stabilization to the material before insertion, creating a protective charge that prevents premature compaction during rapid loading, allowing high-speed material insertion while maintaining uniform distribution and preventing molding flaws
Solution Approach 2:
The patent uses electrostatic charge as an intermediary force during material insertion, creating a repulsive barrier that prevents particles from compacting too quickly, enabling rapid loading while maintaining manufacturing precision through controlled electrostatic fields
4Productivity
If the mold is made thin for heat conduction, then heating and cooling efficiency improves, but the mold cannot resist the pressure from material expansion
Solution Approach 1:
The patent uses composite mold construction combining thin outer walls for heat conduction with internal reinforcing structures, achieving both rapid thermal response and sufficient mechanical strength to resist expansion pressure from the material during molding
Solution Approach 2:
The patent applies local quality by making the mold walls thin in areas requiring heat transfer while adding localized reinforcement in areas requiring pressure resistance, optimizing both thermal efficiency and structural strength through spatially differentiated design
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 ensures reliable, versatile production of high-performance impact-absorbing materials with improved structural integrity, efficient production cycles, and enhanced surface finish, effectively addressing the limitations of conventional molding techniques.
Implementation Method 1
heating of the mould to a temperature of 140-160°C, so that the material solidifies in the mould
Implementation Method 2
cooling of the mould, e.g. to 50-70°C
Implementation Method 3
The mould should be of the minimum thickness possible, sufficiently thick to resist the pressure generated by the material during expansion and have the best heat conduction possible
Implementation Method 4
extract the moulded object, by injecting a pressurised fluid into the mould from the outside
Implementation Method 5
electrostatic stabilisation, that is, dispersion of any residual electrostatic current
Data Source
Figure 1~2
Figure 3~4
AI summary
A process is disclosed for producing objects by inserting powdered material to heat and solidify in a mould (10; 50), characterised by the fact of heating and/or cooling the mould by means of circulation of fluid on the outer surface of the mould.