Extrusion Die Deckle System with Retractable Cleaning Access
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Solution Overview
Problem
Conventional deckle systems for extrusion dies require substantial time and effort for cleaning, often necessitating disassembly, and suffer from inefficient adjustment mechanisms and wasteful replacement of internal deckle blades due to threading damage.
Innovation Solution
The deckle system includes a retractable external deckle with a transversely moveable base that exposes a cleaning access for scrapers, allowing for cleaning without disassembly, and a novel adjustment mechanism with a series of detent recesses and a lever device for rapid internal deckle positioning, along with a removable internally threaded sleeve to prevent unnecessary blade replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional deckle systems are used, then the die can be sealed and extrusion can occur, but cleaning requires substantial time and disassembly
Solution Approach 1:
The deckle blade is segmented into a blade body and a separate throat plate with internal threading. This allows the throat plate to be removed independently for cleaning access to the transition zone, while the blade body remains in place. The segmentation enables partial disassembly specifically for cleaning purposes without requiring complete deckle removal.
Solution Approach 2:
The throat plate is extracted as a separate removable component from the deckle assembly. This extraction provides direct access to the transition zone between the preland and final land channels, allowing cleaning tools to reach previously inaccessible areas without disassembling the entire deckle system.
2Ease of repair
If internal threading is integrated into the deckle blade, then adjustment is possible, but thread damage requires complete blade replacement
Solution Approach 1:
The threading function is segmented from the blade body and placed in a separate throat plate. This allows the throat plate with damaged threads to be replaced independently, preserving the expensive blade body. The segmentation isolates the threaded component that is subject to wear and damage.
Solution Approach 2:
The throat plate is designed as a lower-cost, replaceable component compared to the blade body. When threading damage occurs, the inexpensive throat plate can be replaced rather than the entire blade assembly, following the principle of using cheaper replaceable parts to protect expensive components.
3Speed
If conventional adjustment mechanisms are used, then deckle positioning is possible, but adjustment speed is slow
Solution Approach 1:
The adjustment mechanism uses a dynamic quick-release system with movable lugs and corresponding slots instead of static threaded adjustments. The lugs can be rapidly moved along the slots to change deckle positioning, and the quick-release feature allows fast detachment and reattachment. This dynamic mechanism significantly increases adjustment speed compared to conventional slow-threaded systems.
Data Source
AI summary
The invention provides a deckle system for extrusion dies. In certain embodiments, the invention provides methods of cleaning an extrusion die equipped with a retractable external deckle system. Also provided in some embodiments is a deckle system having a novel deckle adjustment mechanism. In other embodiments, the invention provides an advantageous internal deckle member equipped with a removable, replaceable internally threaded insert.