One-Way Snare for Isolating Broken Elastic Strands
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Solution Overview
Problem
During the manufacturing of elastomeric laminates for absorbent articles, elastic strands often break, leading to loose ends that can entangle and cause downstream issues, necessitating frequent rethreading and potential breakage of adjacent strands, disrupting the production process.
Innovation Solution
The implementation of an apparatus with one-way snares that capture and isolate broken elastic strands, preventing them from retracting back upstream and reducing the likelihood of adjacent strands breaking, thereby minimizing rethreading needs and identifying breakage locations more easily.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If elastic strands are advanced through the manufacturing process, then production continuity is maintained, but strand breakage occurs and loose ends retract causing entanglement and downstream issues
Solution Approach 1:
The patent extracts the broken strand end from the main elastic web by using a snare mechanism that captures and isolates the loose end portion. This separates the problematic retraction issue from the continuous production process, allowing the main web to continue advancing without interruption while the broken end is contained within the snare.
Solution Approach 2:
The snare acts as an intermediary component between the elastic strand and the manufacturing equipment. It intercepts the retracting broken end before it can entangle with upstream components, serving as a buffer that protects the production system from the harmful effects of strand breakage.
2Ease of manufacture
If broken elastic strand ends are allowed to retract freely, then the breakage is simple, but the loose ends become entangled in upstream components requiring process stopping for rethreading
Solution Approach 1:
The snare is positioned in advance along the elastic strand path to perform the capturing action before the retraction and entanglement can occur. This preliminary interception prevents the need for later intervention to stop the process and rethread the strand.
Solution Approach 2:
The snare mechanism automatically captures and holds the broken strand end without requiring external intervention. The system serves itself by containing the problematic element, eliminating the need for operator involvement to address the breakage issue.
3Area of stationary object
If multiple elastic strands advance in close proximity, then efficient use of space is achieved, but a violent retraction of one broken strand can cause adjacent strands to break
Solution Approach 1:
By extracting and isolating the broken strand end within the snare, the patent removes the source of violent retraction from the close-proximity strand arrangement. This prevents the harmful mechanical action from propagating to adjacent strands while maintaining the space-efficient configuration.
Solution Approach 2:
The patent converts the harmful retraction force into a beneficial containment action. The snare captures the retracting end, transforming the potentially destructive motion into a controlled containment process that protects adjacent strands while utilizing the existing space efficiently.
Data Source
AI summary
The present disclosure relates to methods for making elastomeric laminates that may be used as components of absorbent articles. During the process of making the elastomeric laminate, elastic material may be advanced and stretched in a machine direction and may be joined with one or more substrates advancing the machine direction. The methods and apparatuses according to the present disclosure may be configured to automatically isolate elastic materials that may break during the assembly process. The apparatuses may include a base member and one or more one-way snares projecting from the outer surface of the base member. The one-way snares are adapted to permit advancement of continuous elastic strands in a first direction, and are also adapted to prevent an end portion a broken elastic strand from retracting in a second direction, wherein the second direction is opposite the first direction.