Solid Viscose Flat Fiber Transparency Strength Trade-off
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Solution Overview
Problem
Existing methods for producing viscose flat fibers for paper production often result in fibers that are either hollow or contain high-molecular substances, which compromise transparency and structural integrity, limiting their suitability for transparent paper production.
Innovation Solution
A solid viscose flat fiber is produced with a high cellulose content (>98%), a smooth surface, and a width-to-thickness ratio of 10:1 or higher, using a spinning process with a coagulation retarder like polyethylene glycol and controlled acid concentration in the spinning bath to prevent hollow structures and enhance surface smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If hollow fiber structure is used to produce flat fibers, then fiber transparency is improved, but fiber structural integrity and strength deteriorate due to thin walls
Solution Approach 1:
The invention changes the fundamental structural parameter from hollow to solid fiber configuration. By using a solid fiber structure with controlled dimensions (width-to-thickness ratio ≥10:1) and high cellulose content (>98%), the fiber maintains both transparency and structural integrity, eliminating the trade-off present in hollow fiber designs.
2Reliability
If high-molecular substances are added to spinning dope to improve fiber properties, then fiber performance is enhanced, but fiber transparency deteriorates
Solution Approach 1:
The invention changes the compositional parameter by strictly controlling cellulose content to exceed 98%, thereby eliminating or minimizing the presence of high-molecular substances that would compromise transparency. This compositional purity achieves both high performance and transparency simultaneously.
Solution Approach 2:
The invention uses a composite approach by combining high cellulose content (>98%) with specific structural parameters (solid structure, width-to-thickness ratio ≥10:1, smooth surface) to create a material that achieves both enhanced performance and transparency, avoiding the need for transparency-compromising additives.
3Strength
If fiber width is increased to improve paper strength, then mechanical properties are enhanced, but fiber transparency deteriorates due to increased light scattering
Solution Approach 1:
The invention changes the dimensional parameters by optimizing the width-to-thickness ratio to be 10:1 or higher. This specific geometric configuration allows fibers to maintain transparency even at increased widths, as the high aspect ratio minimizes light scattering while providing sufficient mechanical strength for paper applications.
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 resulting fibers are highly transparent and strong, suitable for producing high-quality transparent papers with improved mechanical properties, such as increased breaking length, and can also be used in nonwoven fabrics.
Implementation Method 1
a coagulation retarder, in particular polyethylene glycol, is added to the viscose spinning dope
Data Source
AI summary
The invention relates to a regenerated cellulose fiber in the form of a solid viscose flat fiber having the following properties:The fiber consists of cellulose by more than 98%.The ratio of width B to thickness D of the fiber is 10:1 or higher.The fiber surface is essentially smooth.The fiber is essentially transparent.The fiber according to the invention is particularly suitable for the production of paper.