Elastic Composite Articles With Segmented Tear Paths
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Solution Overview
Problem
Self-adherent elastic composite articles, such as wraps and bandages, exhibit undesirable tear characteristics in the cross-web direction, leading to jagged tears and requiring scissors for separation, which can spread bacteria between patients.
Innovation Solution
Incorporating a nonwoven fibrous coverweb with a woven scrim and spaced elastic yarns, uniformly bonded with a polymeric binder, providing improved cross-web tear characteristics and a smoother finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a self-adherent elastic composite article is used to provide compressive support, then the article can hold layers together against shearing forces, but the article exhibits undesirable tear characteristics in the cross-web direction resulting in jagged or uneven tear lines
Solution Approach 1:
The patent divides the cross-web direction into discrete tear zones by incorporating through-web elements (such as spaced-apart filaments, ribs, or grooves) that create predetermined tear paths. These segmented structures guide the tear to propagate along specific locations rather than creating random jagged patterns, thus maintaining cohesive bonding strength while improving tear line uniformity.
Solution Approach 2:
The patent applies different structural properties to different regions of the article. The through-web elements create localized areas of reduced bonding or structural variation in the cross-web direction, while maintaining the overall cohesive bonding strength in the machine direction. This local modification allows controlled tearing without compromising the overall structural integrity.
2Manufacturing precision
If scissors or cutting tools are used to separate lengths of elastic composite article, then clean cuts can be achieved, but the user must let go of the material and tools raise concern of transferring germs between patients
Solution Approach 1:
The patent enables the article to perform its own separation function through predetermined tear lines or self-separating structures. The user can simply pull or tear the article along the predetermined path without needing scissors or cutting tools, eliminating the need to let go of the material and removing the hygiene concern of tool-mediated patient contact.
Solution Approach 2:
The patent incorporates predetermined tear lines or self-separating structures during manufacturing, preparing the article in advance for clean separation. These pre-formed features guide the tear to propagate along specific paths, achieving clean cuts without requiring external cutting tools or user intervention beyond simple pulling motion.
3Ease of operation
If knitted fabric is used to improve cross-web tear characteristics, then tearability may be enhanced, but the article becomes more expensive to manufacture and may increase force required to tear causing user discomfort
Solution Approach 1:
The patent employs cost-effective through-web elements such as spaced-apart filaments, ribs, or grooves that can be easily manufactured and integrated into the elastic composite article. These simpler structures achieve the desired tearability without the high manufacturing costs associated with knitted fabrics, while maintaining disposable single-use characteristics.
Solution Approach 2:
The patent creates a composite structure combining the elastic composite article with through-web elements that have different mechanical properties. This composite approach allows the base material to maintain its cohesive bonding strength while the through-web elements provide the cross-web tearability, achieving both goals without requiring expensive knitted fabric alternatives.
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 solution enhances cross-web tearability while maintaining elasticity and preventing unwanted tears in the machine direction, reducing manufacturing costs and user discomfort.
Implementation Method 1
uniformly impregnated throughout and bonded together in a unified structure with a polymeric binder
Implementation Method 2
the finished composite exhibits elasticity if the elastic filaments are allowed to relax after the coverwebs are attached to each other
Data Source
AI summary
The present disclosure provides self-adherent, elastic composite articles including a nonwoven fibrous coverweb, a woven scrim, and a plurality of spaced elastic yarns located between the coverweb and the woven scrim; these components are bonded together in a unified structure with a polymeric binder. The elastic composite articles generally demonstrate desirable hand-tear characteristics in the cross-web direction.