Nanocoated Permanent Filter for Additive Manufacturing Gas Purification
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Solution Overview
Problem
Conventional filters in additive manufacturing devices have a short service life, leading to increased risk of uncontrolled reactions and dust explosions, and require frequent replacement, which complicates safe filter removal and maintains high differential pressure levels.
Innovation Solution
A permanent filter device with a metal filter coated with nanofibres or nanoparticles is used, providing enhanced filtration and mechanical strength to withstand multiple cleanings, reducing particle adhesion, and maintaining low pressure loss, while the coating prevents slippage of metal condensates and extends filter life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional filters are used, then filtration is provided, but service life is short and frequent replacement is required
Solution Approach 1:
The patent applies parameter changes by coating the filter with nanofibres or nanoparticles that modify the surface properties. This coating prevents metal condensate adhesion and enables easier cleaning, allowing the filter to withstand multiple cleaning cycles and extend service life from months to years while maintaining operational continuity
Solution Approach 2:
The patent uses composite materials by combining a base filter material (such as metal mesh or fabric) with a coating layer of nanofibres or nanoparticles. This composite structure provides both the mechanical strength and filtration capability of the base material and the anti-adhesion and cleanability properties of the nanocoating, resolving the contradiction between service life and operational continuity
2Ease of operation
If filters are cleaned by pressure surge, then particle removal is achieved, but differential pressure level increases over cycles
Solution Approach 1:
The nanocoating changes the surface energy parameters of the filter, making it hydrophobic or oleophobic depending on the coating material. This parameter change prevents metal condensate adhesion in the first place, so that cleaning requires less pressure and does not increase differential pressure levels over multiple cycles, while still maintaining easy cleanability
3Reliability
If filter openings are reduced to improve filtration, then particle capture increases, but metal condensate slippage increases
Solution Approach 1:
The patent creates a composite structure where the base filter provides mechanical strength and pore structure for particle capture, while the nanocoating layer provides anti-adhesion properties that prevent metal condensate slippage. This allows the use of smaller pore sizes for better filtration without the drawback of condensate passing through, as the nanocoating prevents condensate from adhering to and passing through the filter
Solution Approach 2:
The nanocoating changes the surface energy parameters of the filter pores, creating a superhydrophobic or superoleophobic effect. This parameter change allows the filter to maintain small pore sizes for effective particle capture while preventing metal condensate from wetting and passing through the pores, thus resolving the contradiction between filtration effectiveness and condensate slippage
4Reliability
If reactive particles accumulate on filters, then filtration occurs, but risk of uncontrolled reactions increases
Solution Approach 1:
The nanocoating changes the surface chemistry parameters of the filter to create a barrier that prevents direct contact between reactive particles and the filter material. This parameter change reduces the risk of uncontrolled reactions while maintaining effective particle removal, as particles are captured on the coating surface rather than penetrating into the filter structure where they could react
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 significantly extends the service life of filters, reduces the risk of uncontrolled reactions, and maintains a stable differential pressure level, allowing for safe filter removal and prolonged operation without the need for frequent replacements.
Implementation Method 1
the permanent filter has at least one coating... reducing particle adhesion
Implementation Method 2
filter device for an additive manufacturing device for purifying a process gas
Data Source
AI summary
Disclosed is a filter device for an additive manufacturing device for purifying a process gas of the additive manufacturing device, where the filter device for purifying a process gas during operation has at least one permanent filter, where the permanent filter has at least one coating as well as a method for manufacturing such a filter device. Further disclosed is an additive manufacturing device as well as a method for additive manufacturing.