Laser-Welded Industrial Fabric Seam for Loop Alignment
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Solution Overview
Problem
Conventional seaming technologies face challenges in creating strong, durable seams in industrial fabrics, particularly those made from polymeric yarns with multiple strands, which tend to deform, lose parallelism, and experience secondary helix effects, leading to issues with loop alignment and strength during the pin seam formation process.
Innovation Solution
The application of laser energy to fuse or weld the strands of synthetic polymeric yarns in the seam area, using laser-absorbing materials to prevent deformation and maintain yarn properties, effectively creating seams with strength and durability similar to the fabric body, while addressing issues of deformation and secondary helix effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional seaming methods are used to join fabric edges, then the fabric can be assembled into endless loops, but the seams suffer from loop deformation, loss of parallelism, and secondary helix effects that reduce strength and durability
Solution Approach 1:
The patent applies laser energy to fundamentally change the physical state of the yarn strands at the seam location, transitioning from mechanical interlocking to molecular-level fusion. This parameter change in the joining mechanism eliminates the deformation and parallelism issues inherent in conventional mechanical seaming methods.
Solution Approach 2:
The invention replaces the mechanical pin-seam joining system with a laser-based energy field system. Instead of using physical pins and mechanical interlocking of loops, the patent uses laser energy to fuse strands directly, substituting mechanical action with electromagnetic energy to achieve superior seam integrity.
2Strength
If laser energy is applied to weld fabric strands, then seam strength and durability are significantly improved, but the risk of yarn deformation and property alteration increases
Solution Approach 1:
The patent applies laser energy locally and selectively only to the strands at the seam location, not to the entire fabric. This localized application of energy fuses the strands where needed while leaving the rest of the fabric and yarn properties unchanged, maintaining yarn integrity while achieving strong seams.
Solution Approach 2:
The invention uses controlled partial action of laser energy - applying just enough energy to fuse the strands at the seam without excessive energy that would degrade the yarn properties. The laser parameters are precisely controlled to achieve complete fusion while maintaining yarn integrity.
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 laser welding technique enhances seam strength, durability, and alignment, enabling the use of fabrics with improved performance characteristics and extending their operational life by preventing yarn slippage and maintaining loop parallelism, thus overcoming the limitations of conventional seaming methods.
Implementation Method 1
the use of laser energy to weld or fuse selected locations in paper machine clothing ('PMC') and other industrial and engineered fabrics
Implementation Method 2
The application of laser energy to fuse or weld the strands of synthetic polymeric yarns in the seam area
Data Source
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AI summary
The invention disclosed herein relates to the use of laser energy to weld or fuse selected locations in paper machine clothing ("PMC") and other industrial and engineered fabrics. The invention also relates to an improved loop seam for an on machine seamable papermaker or other industrial fabric.