Print Head Manifold Valving for Pressure-Stable Binder Flow
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Solution Overview
Problem
Existing printing assemblies face issues with pressure fluctuations, inter-container leaks, and defects during priming and de-clogging operations due to lack of independent control over fluid flow and isolation of print heads, leading to material waste and inefficiencies in large-scale commercial production.
Innovation Solution
A printing assembly with a manifold system featuring independently operable inlet and outlet valves, bypass ports, and pressure differentials to control fluid flow, allowing for independent operation of each print head and preventing leaks, enabling precise pressure management during priming and de-clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a manifold with dual containers is used for inlet and outlet flow control, then material circulation is enabled, but pressure control precision deteriorates and leaks occur
Solution Approach 1:
The manifold is divided into separate inlet and outlet sections with independent valve control for each print head. This segmentation allows precise pressure control in each zone while maintaining material circulation through the dual-container system.
Solution Approach 2:
Check valves are introduced as intermediary components between the dual containers and print heads. These check valves prevent backflow and maintain pressure differentials, enabling reliable material circulation without compromising pressure control precision.
2Device complexity
If print heads are connected in parallel without individual isolation, then system simplicity is maintained, but material waste increases during priming and de-clogging
Solution Approach 1:
Individual isolation valves are installed at each print head connection point in the parallel manifold system. This segmentation allows selective closure of specific print heads during priming or de-clogging operations, preventing material waste while maintaining the overall simplicity of the parallel connection architecture.
3Reliability
If pressure is increased to clear clogged print heads, then de-clogging effectiveness improves, but pressure fluctuations affect the entire system
Solution Approach 1:
Isolation valves on each print head enable selective pressurization of individual clogged nozzles. By closing other valves, high pressure can be applied to the specific print head requiring de-clogging without causing pressure fluctuations in the rest of the system, thus maintaining overall pressure stability.
Solution Approach 2:
The isolation valves act as intermediaries that decouple the pressure application at one print head from the rest of the system. This allows effective de-clogging through localized pressure increases while preventing system-wide pressure instability.
4Ease of operation
If manual priming operations are performed without flow control, then operational simplicity is maintained, but time consumption and material waste increase
Solution Approach 1:
Individual inlet and outlet valves at each print head enable selective and controlled priming operations. Operators can open only the necessary valves for specific print heads, reducing the time and material required for priming while maintaining ease of operation through straightforward valve 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
The solution effectively prevents leaks, reduces material waste, and enhances operational efficiency by allowing independent control over fluid flow, improving the reliability and productivity of large-scale commercial production.
Implementation Method 1
wherein each of the plurality of inlet valves and the plurality of outlet valves is independently operable to permit or prevent a flow of binder material from the inlet reservoir to a corresponding one of the plurality of print heads, and from a corresponding one of the plurality of print heads to the outlet reservoir, respectively
Data Source
AI summary
A printing assembly (150) is provided including a manifold assembly including an inlet manifold (210) including an inlet reservoir (238) and an inlet port (266), and an outlet manifold (212) including an outlet reservoir (286) and an outlet port (310). A valve is provided at each of the inlet port of the inlet manifold and at the outlet port of the outlet manifold. The valve is operable between an open position for permitting the flow of material through the port and a closed position for preventing the flow of material through the port. The printing head includes a housing and print heads provided within the housing and in fluid communication with the inlet reservoir via the inlet port and the outlet reservoir via the outlet port. The valves are independently operable to control a flow of material from the inlet reservoir to the print heads, and from the print heads to the outlet reservoir, respectively.