Gap-Sealed Print Head Parking Unit for Binder Jetting
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Solution Overview
Problem
Existing 3D printing technologies are sensitive to dirt, adhesions, and contamination, which can prevent droplet formation and affect the trajectory of droplets, and the capping stations are complex and prone to malfunction.
Innovation Solution
A gap-sealed parking unit for print heads that maintains a contactless seal, using a trough-shaped design with a gap of less than 5 mm, incorporating a capping liquid system and a spitting structure to prevent contamination and drying out, and featuring spiral springs for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capping station with contact seals is used to protect the print head, then protection against drying out and contamination is improved, but device complexity and susceptibility to malfunction increase
Solution Approach 1:
The patent extracts the sealing function from complex mechanical contact seals and implements it through a simple liquid meniscus barrier in the trough. The liquid seal removes the need for moving parts, actuators, and complex mechanical sealing mechanisms, dramatically simplifying the device while maintaining protection against contamination and drying out.
Solution Approach 2:
The patent introduces a liquid intermediary (binder or cleaning fluid) that forms a meniscus seal in the trough. This liquid mediator creates an effective barrier against contamination and evaporation without requiring direct mechanical contact between sealing components, thereby reducing complexity and improving reliability.
2Ease of operation
If the print head is frequently removed and repositioned for maintenance, then cleaning and protection functions are improved, but loss of time and reduced productivity occur
Solution Approach 1:
The patent implements preliminary protection by providing continuous liquid sealing in the trough whenever the print head is parked. This preliminary action prevents contamination and drying out during idle periods, eliminating the need for frequent maintenance interventions and reducing overall downtime.
Solution Approach 2:
The patent ensures continuous protection through the persistent liquid meniscus seal in the trough. The sealing action continues uninterrupted during all parked positions, maintaining print head functionality without requiring periodic maintenance cycles, thereby improving productivity.
3Reliability
If air is present in the pump chamber, then droplet ejection functionality is impaired, but additional purging mechanisms increase device complexity
Solution Approach 1:
The patent uses hydraulic principles by implementing a liquid-filled trough that creates a sealed environment. The liquid barrier prevents air ingress into the pump chamber, maintaining proper droplet ejection functionality without requiring complex pneumatic purging systems or additional air removal mechanisms.
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 reduces contamination and unreliability, maintains print head functionality between printing processes, and extends the protection time against drying out, allowing for longer printer downtime without maintenance.
Implementation Method 1
A thin layer of particulate material is applied to a platform, which is then selectively printed with a binder material using a print head
Implementation Method 2
the function of generating droplets is achieved by piezo elements. These are arranged around a pumping chamber and, stimulated by an electrical signal, can abruptly change the volume of this chamber
Implementation Method 3
elements necessary to maintain the print head function operate in a space partially sealed by a gap seal
Data Source
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AI summary
The invention relates to a method and a device for protecting a print head (100) during layer-by-layer manufacture of a shaped part (103) using the binder jetting process, in which a plurality of elements required for preserving print head function act, and are housed, in a space which is partially sealed off by a gap seal (800).