Cross-Head Die Removable Cassette for Cord Replacement
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Solution Overview
Problem
Current pneumatic tire ply constructions face productivity losses due to the need to disassemble and rethread reinforcement cords when one breaks, and experience issues with cord drag and nonuniform strip formation at the die edges, leading to production disruptions and inefficiencies.
Innovation Solution
A cross-head die assembly with a removable cassette and die insert system that allows for individual cord replacement without disrupting the remaining cords, featuring fluid communication passages and a design that isolates the cassette from elastomer flow, enabling quick cord changes and reducing drag and clogging at the die inlet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide insert is fixed and integrated into the die assembly, then the structural integrity and alignment are maintained, but replacing a broken cord requires complete disassembly and rethreading of all cords, resulting in significant productivity loss
Solution Approach 1:
The guide insert is divided into a permanent body and a removable cassette containing individual cord guides. This segmentation allows the cassette to be quickly removed and replaced without disassembling the entire die assembly, enabling rapid cord replacement while maintaining the structural integrity of the permanent die body.
Solution Approach 2:
The cord guides are extracted from the fixed die assembly and placed into a separate removable cassette. This extraction allows the cassette to be independently removed and replaced, enabling quick cord changes without disrupting the permanent die structure or requiring rethreading of all cords.
2Ease of manufacture
If the die assembly is designed as a single integrated unit, then manufacturing simplicity is maintained, but cord replacement disrupts remaining cords and requires extensive downtime
Solution Approach 1:
The die assembly is segmented into a permanent body and a removable cassette. This segmentation maintains manufacturing simplicity for the permanent die body while enabling rapid cord replacement through cassette exchange, significantly reducing production downtime without complicating the overall manufacturing process.
Solution Approach 2:
The guide insert transitions from a static fixed structure to a dynamic removable cassette system. This allows the cord guides to be easily accessed, removed, and replaced without disrupting the permanent die assembly, enabling quick cord changes and minimizing production interruptions.
3Area of stationary object
If cords are positioned near the edge of the die, then coverage of the entire strip width is achieved, but increased drag causes more stretch and distortion
Solution Approach 1:
The removable cassette allows individual cord guides to be precisely positioned at optimal locations rather than being constrained by fixed die geometry. This enables better distribution of cords across the strip width while reducing edge drag and distortion, improving cord uniformity without sacrificing full width coverage.
Data Source
AI summary
A cross-head die assembly for use with an extruder is described. The cross-head die assembly includes: an inlet section having an inlet for communicating flow from the extruder to one or more flow channels formed in a support block; and an outlet, a removably mounted die located at the outlet and in fluid communication with the one or more flow channels; said support block further comprising an interior slot extending from a first side of the support block to an outlet passageway; a removable cassette positioned in the interior slot, wherein the front end of the removable cassette is positioned to seal the outlet passageway of the slot so that the slot is isolated from the flow.