Polymer Fiber Additive Profiling by Dynamic Injection Rate Control
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Solution Overview
Problem
Existing methods for producing polymer fibers with additives, such as colorants, result in uniform distribution throughout the fiber, lacking the ability to vary the concentration of additives along the fiber's length.
Innovation Solution
A method involving injecting an additive into a polymer flow in a main transfer line with varying flow rates at least twice within 15 minutes to produce a modified polymer flow, which is then extruded into a fiber using a spinneret, resulting in specific locations with varying concentrations of the additive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If additive is mixed with polymer in main hopper or injected into transfer line, then homogeneous polymer melt is produced, but uniform distribution of additive throughout fiber length results, preventing varied concentration profiles
Solution Approach 1:
The system dynamically adjusts the additive injection rate during the fiber production process. The injection rate is varied over time to create different concentration profiles along the fiber length, transforming a static uniform mixing process into a dynamic controlled deposition process that achieves both homogeneity at the melt level and variability at the fiber level.
Solution Approach 2:
The additive injection is performed in periodic cycles with varying rates. The system alternates between different injection rates (e.g., high rate, low rate, zero rate) at specific time intervals during the 15-minute production cycle, creating periodic variations in additive concentration that translate to spatial variations along the continuous fiber length.
2Adaptability or versatility
If additive injection rate is changed at least twice within fifteen minutes, then varied additive concentration along fiber length is achieved, but process complexity increases
Solution Approach 1:
The system changes the injection rate parameter of the additive over time within the 15-minute cycle. By adjusting this single parameter (injection rate) at different time points, the system achieves varied additive concentration profiles without requiring complex structural modifications to the extrusion or fiber formation equipment.
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 method enables the production of fibers with distinct locations of additive concentrations, allowing for tailored properties and functionalities along the fiber length.
Implementation Method 1
The additive and polymer melt are mixed in the transfer line to produce a homogeneous polymer melt
Implementation Method 2
an extruder produces a polymer melt in a transfer line and an additive is injected into the transfer line
Data Source
AI summary
Described is a fiber containing at least one polymer and at least one additive. The concertation of the additive is not constant throughout the fiber, but changes along the length of the fiber. Also disclosed is a method of making a fiber.