Composite Cutting Mat Backing Resolves Cupping
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Solution Overview
Problem
Cutting mats used in rotary die cutting equipment experience cupping, leading to surface irregularities and imperfections in the finished corrugated products due to non-uniform backing materials, which results in increased scrap and potential rejection.
Innovation Solution
A composite cutting mat backing formed from a fiber material and cured resin, providing greater rigidity and conformability to the rotary anvil surfaces, reducing or eliminating cupping and maintaining a flat, uniform surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a steel backing layer is used to provide stiffness and support, then the cutting mat gains structural strength, but cupping occurs causing surface irregularities
Solution Approach 1:
The patent replaces the traditional steel backing layer with a composite material consisting of a fabric reinforcement layer embedded in a polymeric matrix. This composite structure provides the necessary stiffness and strength while eliminating the cupping problem that plagues steel backings, achieving both structural integrity and surface uniformity.
Solution Approach 2:
The invention changes the material parameters of the backing layer by transitioning from metal (steel) to a polymeric composite system. This parameter change allows tuning of mechanical properties through resin selection, fiber orientation, and matrix composition to achieve optimal balance between stiffness and flatness.
2Strength
If conventional backing materials are used, then mounting support is provided, but flexibility is reduced complicating installation
Solution Approach 1:
The polymeric matrix provides viscoelastic properties that allow the backing to flex during installation and then stabilize in its final position. The material's ability to deform under stress and return to its original shape facilitates easy mounting while maintaining structural support.
Solution Approach 2:
The combination of flexible fabric reinforcement with a pliable polymeric matrix creates a composite that exhibits both structural support and installation flexibility. The fabric provides tensile strength while the polymer matrix allows for bending and conforming during the mounting process.
3Manufacturing precision
If the backing material cannot maintain a uniform surface, then gaps form between the mat and anvil, but increasing rigidity to reduce gaps creates high spots and low spots
Solution Approach 1:
The fabric-reinforced polymeric composite provides distributed structural support that maintains uniform surface contact with the anvil. The fabric network prevents localized deformation while the polymer matrix ensures conformability, eliminating both gaps and extreme high/low spots.
Solution Approach 2:
The composite structure provides locally optimized properties where the fabric reinforcement distributes stress evenly across the surface, preventing localized cupping or deformation. This local reinforcement mechanism maintains consistent surface quality throughout the entire mat area.
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 composite backing significantly reduces cupping and low spots, enhancing the quality of the finished products by ensuring a uniform cutting surface and extending the life of the cutting mats.
Implementation Method 1
infusing the roving with a polymer resin and curing the resin via electromagnetic radiation to form the cutting mat backing
Data Source
AI summary
In various embodiments, a method of making a cutting mat backing includes creating a roving by wrapping a fiber material around a rotary cylinder under tension to form a plurality of layers. Each of the plurality of layers is angled with respect to a central axis of the rotary cylinder and the roving has a normalized axial flexural rigidity of from 2 lbf.in2 to 30 lbf.in2 over a beam width of 1 inch and a ratio of normalized circumferential flexural rigidity to normalized axial flexural rigidity of from 1:1 to 30:1. The method further includes infusing the roving with a polymer resin and curing the resin via electromagnetic radiation to form the cutting mat backing. Cutting mats including the cutting mat backing are also described.