Unitized Composite Fabrics with Wave-Like Shaping
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Solution Overview
Problem
Existing methods for creating thicker, three-dimensionally raised fabric structures often compromise tensile strength and stiffness due to the reduction in fiber-to-fiber bond strength and internal cohesion, especially when using short fibers or post-treatment processes like creping and micro-creping.
Innovation Solution
A simplified manufacturing method using conventional short fiber airlaid process equipment, where an airlaid assembly of loose, randomly oriented short fibers is shaped into a repeating wave-like form using a transfer device moving faster than the oven wire, and then bonded at high temperature to create a unitized composite with adjustable wavelength and amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If mechanical shaping treatments (corrugation, pleating, creping) are used to create thicker three-dimensional fabric structures, then fabric thickness and bulk are improved, but tensile strength and stiffness deteriorate due to reduced fiber-to-fiber bond strength and internal cohesion
Solution Approach 1:
The wave-like shaping is performed on the loose fiber assembly before bonding occurs. The assembly is shaped while still in a loose, unbonded state, allowing the three-dimensional structure to be formed without compromising the fiber-to-fiber bonds that will later provide tensile strength. This preliminary shaping action resolves the contradiction by establishing the thick structure before bonding reduces flexibility.
Solution Approach 2:
The invention creates wave-like shaping in the z-direction (thickness direction) while maintaining fiber alignment primarily in the machine direction. By utilizing the z-dimension for structural complexity rather than compromising in-plane fiber bonds, the fabric achieves increased thickness without sacrificing tensile strength in the primary loading direction.
2Volume of stationary object
If mechanical shaping treatments are applied to short fiber assemblies, then fabric bulk and softness are improved, but fiber-to-fiber bond strength and internal cohesion deteriorate
Solution Approach 1:
The shaping is performed on the loose fiber assembly before bonding takes place. This preliminary action allows the short fibers to be arranged in a wave-like configuration while maintaining their random orientation and potential for bonding, rather than attempting to reshape already-bonded fibers which would damage internal cohesion.
Solution Approach 2:
The invention changes the state of the fiber assembly from bonded to unbonded temporarily, allowing shaping to occur without compromising bond strength. By controlling the sequence of operations (shape first, then bond), the process parameters are optimized to achieve both high bulk and high internal cohesion.
3Volume of moving object
If conventional shaping methods are used to create wave-like structures, then fabric thickness is improved, but manufacturing complexity increases due to multiple process steps and machinery adjustments
Solution Approach 1:
The invention merges the shaping function with the existing airlaid web formation process. By using the airlaid assembly process itself to create the wave-like structure through controlled deposition onto a shaped surface, rather than adding separate corrugation or pleating machinery, the manufacturing process is simplified while achieving the same thickness enhancement.
Solution Approach 2:
The invention replaces complex mechanical shaping systems (corrugation rolls, pleating devices, creping mechanisms) with a simpler airlaid deposition system. The wave-like structure is created by the airflow and deposition mechanics inherent in the airlaid process, eliminating the need for additional mechanical shaping equipment and reducing overall manufacturing 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
This method allows for the production of high thickness, high basis weight, and high bulk, low-density unitized composites that can be either extensible or inelastic, while maintaining or improving tensile strength and stiffness, without the need for significant machinery adjustments.
Implementation Method 1
The shaped assembly is subsequently subjected to a high temperature in an oven or other suitable activation step sufficient to cause the thermally sensitive elements to bond the assembly together into a unitized composite
Implementation Method 2
This causes the flat assembly to buckle and pile up into a repeating wave-like form of the desired amplitude and wavelength
Data Source
Figure 1~3B
Figure 4
Figure 5~6
AI summary
A manufacturing method for producing a unitized composite material has been discovered. An assembly of loose fibers or fiber and fabric combinations is formed where at least one of the layered elements contains a bondable material such as a thermally sensitive bonding fiber. The un-bonded layered assembly is shaped into a wavy form having a repeating wave-like pattern of the desired amplitude and wavelength. The amplitude and wavelength of the repeating waves can be altered such as by changing the relative speeds of a transfer device and an oven wire and the height of the transfer device relative to the height of the oven wire using simple machinery control settings. The shaped assembly is subsequently bonded in an oven or other activation step preserving the wave-like shaping when cooled or removed from the activation effect.