Printhead Electroactive Viscosity Reduction for High Viscosity Materials
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Solution Overview
Problem
Current three-dimensional printing printheads are limited in their ability to handle high viscosity materials, as they can only effectively eject fluids with viscosities in the 5-20 cP range, restricting the range of materials that can be used for object formation and reducing productivity.
Innovation Solution
A printhead configuration that includes a reservoir with electroactive elements and an electrical signal generator to thin high viscosity materials, allowing them to flow through the printhead by applying shear stress and reducing viscosity, enabling the use of higher viscosity fluids for printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional printheads are used, then materials with viscosity in the 5-20 cP range can be ejected, but materials with higher viscosity cannot be processed
Solution Approach 1:
The patent applies parameter changes by using electroactive elements to alter the viscosity parameter of high viscosity materials. The electroactive elements generate electrical signals that change the physical state of the material, reducing its viscosity from a high state to a lower state that enables ejection through the printhead nozzles.
Solution Approach 2:
The patent replaces the conventional purely mechanical pressure-based ejection system with an electro-active system. Instead of relying solely on mechanical pressurization, the system uses electroactive elements (such as piezoelectric or dielectric materials) to induce viscosity changes in the material, enabling ejection of materials that would otherwise be too viscous for mechanical ejection.
2Adaptability or versatility
If single nozzle printheads are used to eject high viscosity materials, then material ejection is possible, but productivity is limited due to inability to manufacture as arrays
Solution Approach 1:
The patent segments the printhead into multiple independent nozzle units, each equipped with its own electroactive elements and material reservoir. This segmentation allows the system to process high viscosity materials through multiple nozzles simultaneously while maintaining the electro-active viscosity reduction mechanism in each segment, thereby enabling array configuration for improved productivity.
Solution Approach 2:
The patent creates a universal printhead design where each nozzle unit can independently handle high viscosity materials through the electroactive viscosity reduction mechanism. This multi-functional design allows the same printhead architecture to process a wide range of material viscosities while maintaining array configuration for high productivity.
3Adaptability or versatility
If conventional printheads are used, then device structure is simple, but only limited viscosity range materials can be printed
Solution Approach 1:
The patent integrates electroactive elements into the printhead structure that can change the viscosity parameter of materials on demand. These elements are positioned to interact with the material flow, and when electrical signals are applied, they induce local viscosity changes that enable high viscosity materials to flow through the printhead and be ejected successfully.
Solution Approach 2:
The patent replaces complex mechanical viscosity control mechanisms (such as variable pressure systems or heating elements) with electroactive elements that can more precisely and rapidly control material viscosity through electrical fields. This substitution enables better adaptability to different material viscosities while managing device complexity through electronic control.
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
Facilitates the use of higher viscosity materials in three-dimensional printing, enhancing the productivity and versatility of the printing process by ensuring the thinned fluids can be efficiently ejected and replenished within the printhead.
Implementation Method 1
activate selectively the at least one electroactive element with a first electrical signal to move the at least one member and thin the high viscosity material adjacent the at least one member
Data Source
AI summary
A printer includes a printhead configured to eject high viscosity material and refill a manifold in the printhead with high viscosity material. The printhead includes a layer having an opening to form a reservoir to hold a volume of a high viscosity material and at least one member positioned within the receptacle formed by the opening in the layer. The at least one member has an electroactive element mounted to the member, and an electrical signal generator is electrically connected to the electroactive element. A controller operates the electrical signal generator to activate selectively the electroactive element with a first electrical signal to move the at least one member and thin the high viscosity material adjacent the at least one member to enable the thinned material to move away from the at least one member.