Removable Die Insert Gas Purging for Coating Defects
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Solution Overview
Problem
Conventional die inserts for fluid extrusion in coating processes face challenges such as gas entrapment, weight issues, and maintenance difficulties, leading to defects like streaks and voids in the extrudate due to trapped air bubbles and particulate settlement.
Innovation Solution
A die assembly with a removable insert featuring flow channels and conduits for gas purging, chamber reduction to alleviate weight, and controlled gap design to facilitate easy installation and reduce gas entrapment, utilizing external fluid supply for purging and material distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If die inserts are used to reduce effective slot width, then coating width control is improved, but gas entrapment increases leading to defects
Solution Approach 1:
The patent extracts the harmful gas from the die cavity by providing dedicated gas venting pathways that allow trapped air to escape during the extrusion process, thereby eliminating the defect-causing gas entrapment while maintaining the insert's width-control function
Solution Approach 2:
The patent implements preliminary gas venting channels and vacuum assistance before extrusion to remove trapped gas from the die cavity and insert interfaces, preventing gas entrapment defects before they can manifest in the extruded product
2Manufacturing precision
If die cavity volume is reduced to minimize particulate settlement, then product quality is improved, but weight reduction is insufficient
Solution Approach 1:
The patent segments the die insert into a modular structure with separate functional zones including flow channels, venting pathways, and support elements, allowing optimization of each segment's mass while maintaining overall functionality and achieving weight reduction
Solution Approach 2:
The patent employs thin-walled construction and optimized wall thickness in the die insert design, reducing material usage and weight while maintaining structural integrity and flow control functions
3Manufacturing precision
If conventional die inserts are used, then slot width control is achieved, but maintenance difficulty increases
Solution Approach 1:
The patent designs the die insert as a removable, modular component that can be easily detached from the die housing for cleaning and maintenance, with standardized interfaces that simplify replacement and reduce downtime
Solution Approach 2:
The patent implements a design where the die insert can be quickly removed, cleaned, or replaced as a disposable or recoverable component, streamlining maintenance operations and reducing the complexity of in-situ servicing
4Manufacturing precision
If die inserts are installed in die cavity, then effective slot width is reduced, but gas entrapment and void formation increase
Solution Approach 1:
The patent introduces gas venting channels and vacuum assistance as intermediary mechanisms between the die insert and die cavity, providing controlled pathways for gas evacuation that prevent void formation while preserving the insert's width-control function
Solution Approach 2:
The patent implements preliminary gas removal through venting channels and vacuum assistance before extrusion begins, eliminating trapped gas that would otherwise cause defects in the final product
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 purges gas from the die cavity, reduces defects by minimizing air bubbles, and simplifies maintenance by allowing for easier handling and cleaning, ensuring consistent and defect-free fluid extrusion.
Implementation Method 1
A die assembly with a removable insert featuring flow channels and conduits for gas purging
Implementation Method 2
a first conduit passing through at least part of the body portion of the insert, and the first conduit is in fluid communication between the inlet passageway and the outlet passageway
Data Source
AI summary
A die assembly includes a die housing having a multiplicity of inner wall sections defining a die cavity, an inlet passageway passing through the die housing in fluid communication with the die cavity, and an outlet passageway passing through the die housing in fluid communication with the die cavity at a position distal from the inlet passageway. The die assembly also includes an insert removably received in the die cavity. The insert includes a body portion having a multiplicity of outer wall sections, and at least one flow channel is formed between at least one inner wall section of the die housing and each opposite outer wall section of the body portion of the insert; fluid communicates between the external supply and each of the flow channels and the outlet passageway. Also provided is a die insert and a method of purging gas from a die having an insert.