Ceramic Extrusion Drainage Plate with Sealed Radial Liquid Channels
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Solution Overview
Problem
Existing extrusion processes for ceramic-forming batch mixtures suffer from fluid accumulation at hardware interfaces, leading to defects such as fissures and cracks in the extruded articles due to uneven drying and surface streaking of liquid components.
Innovation Solution
The use of drainage plates with radially extending channels and a seal portion to selectively migrate liquid components away from the batch mixture, preventing their accumulation and deposition on the extrudate surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional extrusion hardware is used without drainage features, then the extrusion process is simpler, but liquid components accumulate at hardware interfaces causing defects such as fissures, cracks, and surface streaking
Solution Approach 1:
The drainage plate is segmented into distinct functional zones: a seal portion with enhanced thickness for sealing, and radially extending drainage channels for fluid removal. This segmentation allows each zone to perform its specific function optimally while working together to prevent defects.
Solution Approach 2:
The drainage plate acts as an intermediary component between the extrusion die and the hardware interface. It mediates the flow of liquid components by providing a controlled path for drainage, preventing direct accumulation at the hardware interface that would cause defects.
2Manufacturing precision
If drainage features are added to remove liquid components, then fluid streaking and defects are reduced, but the manufacturing complexity of the drainage plate increases
Solution Approach 1:
The drainage plate utilizes parameter changes in its structure, specifically varying the thickness of the plate radially. The seal portion has greater thickness than the drainage channel regions, creating natural sealing pressure while allowing liquid to flow through the thinner channel sections. This parameter variation achieves both sealing and drainage functions.
Solution Approach 2:
The drainage channels create a controlled porous pathway through the drainage plate structure. Liquid components can pass through these channels while the overall structure maintains structural integrity. The channel geometry provides selective permeability for liquid removal.
3Reliability
If the seal portion has greater thickness, then sealing effectiveness is improved, but the overall material usage and manufacturing complexity increase
Solution Approach 1:
The drainage plate applies local quality by concentrating the increased thickness specifically at the seal portion where sealing is required, while the drainage channel regions maintain reduced thickness to facilitate liquid flow. This localized thickness variation provides effective sealing only where needed without excessive material usage throughout the entire plate.
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
Reduces or eliminates fluid streaking and associated defects in ceramic articles by effectively removing liquid phases during extrusion, ensuring defect-free manufacturing.
Implementation Method 1
the seal portion comprises an oleophilic material
Implementation Method 2
pressurizing batch mixture to force the batch mixture through an extrusion die of an extrusion assembly
Data Source
AI summary
A drainage plate (10) for an extruder assembly including a body (12) having an inner edge (14) and an outer edge (15). A seal portion (24) of the body extends radially from the inner perimeter toward the outer perimeter. One of more drainage features are located radially outward of the seal portion. The one or more drainage features extend an axial depth into the body such that a first thickness (t1) of the drainage plate at the seal portion is greater than a second thickness (t2) of the drainage plate at the one or more drainage features. Methods of manufacturing a drainage plate and manufacturing ceramic articles are also disclosed.