Acrylonitrile Fiber Bundle Spinning via Flow Control Guide
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Solution Overview
Problem
Conventional spinning methods for producing acrylonitrile-based fiber bundles face challenges such as insufficient relaxation of accompanying flows, generation of local vortices, and increased equipment costs due to the need for larger equipment widths.
Innovation Solution
The method involves extruding a spinning dope solution through multiple discharge holes in a spinneret, forming coagulated fibers in a coagulation bath, and using a direction changing guide part with a fiber-free region to control the flow of the coagulation bath liquid, thereby reducing the speed of liquid flows colliding with the fibers and minimizing equipment width requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the traveling speed of fibers is increased to improve production efficiency, then productivity increases, but accompanying flows increase causing uneven tension and physical properties of coagulated fibers
Solution Approach 1:
A flow control member is introduced as an intermediary element between the coagulated fibers and the coagulation bath liquid. This member selectively controls the flow of coagulation bath liquid to relax accompanying flows generated by high-speed fiber travel, thereby maintaining fiber quality while preserving productivity
Solution Approach 2:
The invention changes the flow parameters of the coagulation bath liquid by introducing a flow control member that modifies liquid flow velocity and distribution. This parameter change allows the system to operate at higher fiber traveling speeds while preventing excessive accompanying flows that would deteriorate fiber quality
2Productivity
If the number of discharge holes per spindle is increased to improve production efficiency, then productivity increases, but accompanying flows increase causing uneven tension and physical properties of coagulated fibers
Solution Approach 1:
The flow control member acts as a mediator that handles the increased accompanying flows generated by higher discharge hole density. It selectively regulates liquid flow to maintain tension uniformity even when many discharge holes are used, thereby preserving fiber quality while achieving high productivity
Solution Approach 2:
The invention modifies the flow parameters of the coagulation bath liquid through the flow control member, allowing the system to accommodate higher discharge hole counts without excessive accompanying flows. This parameter adjustment enables increased productivity while maintaining consistent fiber physical properties
3Productivity
If the density of discharge holes is increased to improve production efficiency, then productivity increases, but accompanying flows increase causing uneven tension and physical properties of coagulated fibers
Solution Approach 1:
The flow control member serves as a mediator that manages the accompanying flows generated by high discharge hole density. It selectively controls liquid flow to maintain uniform tension and physical properties in coagulated fibers, thereby preserving quality while enabling high productivity through increased hole density
4Manufacturing precision
If the flow speed of coagulation bath liquid is increased to improve fiber formation, then fiber formation improves, but the surface of the coagulation bath liquid fluctuates more largely causing decrease in spinnability
Solution Approach 1:
The flow control member acts as a mediator that regulates the relationship between liquid flow speed and surface stability. It selectively controls liquid flow to maintain appropriate flow speeds for fiber formation while preventing excessive surface fluctuations that would reduce spinnability
Solution Approach 2:
The invention adjusts flow parameters through the flow control member to optimize the balance between fiber formation quality and surface stability. By controlling liquid flow velocity and distribution, it maintains high fiber formation quality while preventing surface fluctuations that would deteriorate spinnability
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 approach allows for the stable production of high-grade, high-quality acrylonitrile-based fiber bundles even at increased traveling speeds and higher numbers of discharge holes, while reducing equipment costs and maintaining high production efficiency.
Implementation Method 1
the spinning dope solution comes into contact with a coagulation bath liquid to form coagulated fibers
Implementation Method 2
their traveling direction is changed by a direction changing guide part to cause them to travel diagonally upward
Implementation Method 3
the spinning dope solution can thin as it runs through the air gap where air resistance is small
Data Source
AI summary
Provided herein is a method for producing an acrylonitrile based fiber bundle by dry-jet wet spinning technique that serves to allow a high-grade, high-quality acrylonitrile based fiber bundle to be produced stably even if the traveling speed of the coagulated fibers is increased or the number of spinneret discharge holes is maximized in an attempt to enhance the production efficiency. The production method for an acrylonitrile based fiber bundle is characterized by first extruding a spinning dope solution through a plurality of discharge holes in a spinneret, then allowing the spinning dope solution to run downward into a coagulation bath liquid stored in a coagulation bath to form coagulated fibers, turning the coagulated fibers upward on a direction changing guide part located in the coagulation bath liquid below the spinneret, and pulling them out of the coagulation bath liquid, wherein certain requirements are met.