Creasing method, creasing apparatus, and long fiber non-woven fabric
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Solution Overview
Problem
Existing methods for forming creases in long fiber non-woven fabrics face challenges in maintaining bending habit and achieving desired effects like heat retention, as irregular creases lack uniformity and regular creases fail to sustain bending habit effectively.
Innovation Solution
A creasing method involving a gripping and rotating step to twist and heat the fabric, followed by widening, which forms regular inclined creases that enhance rigidity and restore force, ensuring the creases maintain their shape and effects over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If irregular uneven creases are formed on the long fiber non-woven fabric by packing in a bag, then the creasing process can be simplified, but the degree of unevenness varies depending on location and the heat retention effect cannot be sufficiently obtained
Solution Approach 1:
The invention uses a crease forming roller with a specific curved surface (cylindrical or conical shape) to press against the non-woven fabric. This curved surface creates regular, uniform creases with consistent folding lines throughout the fabric, eliminating the location-dependent unevenness caused by bag packing while maintaining ease of manufacture through continuous roller processing.
2Productivity
If two types of regular creases with intersecting folding lines are formed, then continuous production is possible, but the regular folding lines cannot sufficiently maintain bending habit
Solution Approach 1:
The invention employs crease forming rollers with asymmetric curved surfaces (particularly conical rollers) that create creases with specific geometric characteristics. The asymmetric curvature produces folding lines that naturally maintain bending habit better than regular intersecting creases, while the continuous roller mechanism preserves high productivity.
Solution Approach 2:
By using conical or cylindrical rollers with specific curvature radii, the invention creates creases with optimized geometric properties. The curved surface contact produces folding lines that follow the natural grain of the non-woven fabric, enhancing bending habit maintenance while enabling continuous production through the roller mechanism.
3Stability of the object's composition
If the long fiber non-woven fabric is heated to fix the folding line, then the crease shape is stabilized, but the fabric requires additional heating equipment and process time
Solution Approach 1:
The invention combines the crease forming and heating functions into a single integrated process. The crease forming roller itself is heated to serve as both the pressing tool and the heating element, eliminating the need for separate heating equipment. The fabric is heated during the creasing operation itself, stabilizing the crease shape without adding additional process steps or equipment complexity.
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 achieves continuous wave creases that maintain bending habit and enhance heat retention in long fiber non-woven fabrics, ensuring the required effects last longer.
Implementation Method 1
a first heating step of heating the twisted long fiber non-woven fabric to fix the folding line to the long fiber non-woven fabric after the first gripping and rotating step
Data Source
AI summary
A creasing method includes: a gripping and rotating step of bunching and gripping a continuously drawn long fiber non-woven fabric and rotating the gripped part so that the long fiber non-woven fabric is twisted and a first folding line is formed; a heating step of heating the twisted long fiber non-woven fabric to fix the first folding line; and a widening step of releasing the long fiber non-woven fabric having the first folding line formed thereon.