Roller Surface Sections for Filament Grip and Release
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Solution Overview
Problem
The lyocell process faces challenges in minimizing slippage and filament damage during high-speed production due to conflicting requirements for adhesion and detachment of filaments on rollers, leading to defects and production stoppages.
Innovation Solution
The roller surface is designed with alternating sections of high and low surface tension to ensure proper adhesion and detachment of filaments, using materials like metals and synthetic polymers, with specific surface tension ranges and structural features such as creases or grooves to manage filament transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the roller surface has high adhesion to prevent slippage, then filament transport reliability is improved, but filament damage and breakage increase due to excessive mechanical forces
Solution Approach 1:
The roller surface is divided into multiple sections with different surface tension characteristics. First sections have higher surface tension for reliable adhesion and filament transport, while second sections have lower surface tension to reduce mechanical forces and prevent filament damage during detachment. This local differentiation resolves the contradiction between adhesion and filament protection.
2Object-affected harmful factors
If the roller surface has low adhesion to prevent filament damage, then filament integrity is improved, but slippage occurs leading to production stoppages
Solution Approach 1:
The roller surface is divided into multiple sections with different surface tension characteristics. First sections have higher surface tension for reliable adhesion and filament transport, while second sections have lower surface tension to reduce mechanical forces and prevent filament damage during detachment. This local differentiation resolves the contradiction between adhesion and filament protection.
3Productivity
If spinning speed is increased to improve productivity, then production efficiency is improved, but filament defect proportion increases
Solution Approach 1:
The invention changes the surface tension parameter of the roller surface by using different materials or coatings in different sections. This parameter modification allows the roller to maintain optimal interaction with filaments at high spinning speeds, preventing both slippage and excessive adhesion that would cause defects, thereby enabling high productivity without compromising filament quality.
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
This design effectively prevents slippage and filament breakage, ensuring high-quality yarn production even at high speeds by maintaining optimal filament contact and detachment, reducing defects and process interruptions.
Implementation Method 1
the roller surface comprises first sections displaying a surface tension so that, depending on the liquid adhering to the filament or yarn, one of the following conditions is fulfilled: a) surface tension of the first sections is in the range of from 0.25 to 3.5 times, preferably 0.35 to 2.5 times, more preferably 0.4 to 0.8 times the surface tension of the liquid
Implementation Method 2
the roller surface comprises second sections having a surface tension lower than the first sections
Data Source
AI summary
The present invention relates to the surface adaptation of a roller to be employed in the production of cellulose filament yarns.