Electrostatic Flocking Apparatus for Thermal Interface Materials
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Solution Overview
Problem
Existing thermal interface materials (TIMs) face challenges in achieving high thermal conductivity due to random distribution of thermal conductive fillers, leading to low flocking density and orientation, which limits their performance and increases production costs.
Innovation Solution
An automatic production apparatus utilizing a conveyor system with conveyer belts of different speeds, an electrostatic flocking assembly, and a thermosetting device to achieve high flocking density and orientation of staple fibers within a polymer matrix, enhancing vertical thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thermal conductive fillers are doped into polymer matrix by random blending, then the manufacturing process is simple, but the thermal conductivity is limited due to random distribution of fillers
Solution Approach 1:
The patent replaces random mechanical blending with an electrostatic field-based assembly system. The electrostatic flocking assembly uses high-voltage electrostatic fields to induce alignment of thermal conductive fillers (particularly carbon fibers) within the polymer matrix, transforming the random distribution into an oriented structure that forms effective thermal conduction paths without requiring complex manual intervention
Solution Approach 2:
The patent changes the physical state and distribution parameters of thermal conductive fillers by applying electrostatic fields during the flocking process. This causes the fillers to transition from random distribution to oriented alignment, fundamentally changing how thermal conductivity is achieved in the composite material
2Reliability
If field assisted assembly is used to align carbon fibers, then the directional properties are improved, but the energy consumption is huge and cost increases
Solution Approach 1:
The patent employs a dynamic electrostatic flocking process where the polymer matrix is continuously conveyed through the electrostatic field at controlled speeds. The conveyor system creates a dynamic environment where fibers are aligned by electrostatic forces during motion, allowing for efficient energy utilization compared to static field application methods
Solution Approach 2:
The patent optimizes energy consumption by controlling the voltage parameters and exposure time of the electrostatic field. By adjusting the conveyor speed and electrostatic field strength, the system achieves effective fiber alignment with minimized energy input, making the process economically viable
3Reliability
If electrostatic flocking is used to align fibers, then the orientation is improved, but the flocking density is low and production efficiency is limited
Solution Approach 1:
The patent merges the electrostatic flocking process with a continuous conveyor system and automated resin perfusion. This integration allows multiple operations (fiber alignment, matrix application, and resin infusion) to occur simultaneously in a continuous workflow, dramatically increasing production efficiency and flocking density compared to batch electrostatic flocking methods
Solution Approach 2:
The patent implements continuous production through the conveyor system that continuously transports polymer matrices through the electrostatic flocking assembly and subsequent resin perfusion. This eliminates idle time between batches and maintains continuous useful action, significantly boosting productivity while preserving fiber orientation quality
4Reliability
If CVD method is used to grow oriented carbon nanotubes, then the thermal conductivity is improved, but the production cost is high and industrial scalability is difficult
Solution Approach 1:
The patent uses readily available thermal conductive fillers (carbon fibers, aluminum oxide, boron nitride) that can be purchased at low cost and applied through the electrostatic flocking process, replacing the expensive and complex CVD growth method for carbon nanotubes. This approach achieves comparable or superior thermal conductivity at a fraction of the material and equipment cost
Solution Approach 2:
The patent replaces the complex chemical vapor deposition process with a simpler electrostatic field-based assembly method. This substitution eliminates the need for specialized CVD equipment, high-temperature furnaces, and complex chemical precursor systems, making the manufacturing process much more accessible and scalable for industrial production
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 apparatus enables stable and efficient production of high-thermal-conductivity flocking pads with improved fiber orientation and density, reducing energy consumption and production costs while preventing dust and impurities entry.
Implementation Method 1
an electrostatic flocking assembly for flocking on the polymer matrix
Implementation Method 2
a conveyor system for conveying polymer matrix; the conveying system including at least a first conveyer belt, a second conveyer belt and a third conveyer belt
Implementation Method 3
a thermosetting device for curing the poured polymer matrix
Data Source
AI summary
An automatic production apparatus for high-thermal-conductivity flocking pad includes a conveyor belt system, a cutting assembly, an electrostatic flocking assembly, a perfusion device and a thermosetting device, wherein the electrostatic flocking assembly is connected to a power supply which is configured for outputting a step-wave voltage through a bottom screen mesh thereof. The polymer matrix is conveyed through the conveyor belt system, and is stretched, flocked in the step-wave electric field, shrunk, poured and dried to form a flocking pad product with high-thermal-conductivity. In this invention, the polymer matrix is stretched and shrunk to make the flocking be dense by regulating and controlling the speed of the conveyor belt system, a step-wave electric field is provided during the flocking process, and meanwhile, the flocking, pouring and curing time is regulated and controlled.