Leg Cuff Elastic Strand Severing for Diaper Gasketing
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Solution Overview
Problem
In the manufacturing of diapers, the elastic strands in leg cuffs often become inadvertently bonded to other components during the manufacturing process, leading to unretracted elastic ends that affect the aesthetic appearance and functionality of the diapers.
Innovation Solution
The method involves forming elastic laminates with intermittently bonded and severed elastic strands, which are then bonded to a topsheet substrate, ensuring that the elastic regions are correctly positioned and functional.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If elastic strands are intermittently bonded to substrates to create leg cuffs, then the leg cuff functionality and aesthetic appearance are improved, but the elastic strands may inadvertently become bonded to other component parts during manufacturing, causing unretracted elastic ends
Solution Approach 1:
The patent applies preliminary action by severing the elastic strands in the non-bonded regions before the elastic laminate is bonded to the topsheet substrate. This pre-severing ensures that the elastic strands are ready to retract properly to the bonded regions without risk of becoming ensnared in tack-down bonds during subsequent manufacturing steps, thereby resolving the contradiction between assembly precision and retraction reliability.
Solution Approach 2:
The patent segments the elastic laminate into distinct bonded regions and non-bonded regions along the machine direction. By creating these segmented zones, the elastic strands are confined to specific areas where they should be bonded, while the non-bonded regions allow for proper severing and retraction, preventing unintended bonding to other components and ensuring reliable leg cuff functionality.
2Ease of manufacture
If the elastic laminate is bonded to the topsheet substrate after severing, then the manufacturing process is simplified, but the elastic strands may become ensnared in tack-down bonds if not properly managed
Solution Approach 1:
The patent performs the severing of elastic strands as a preliminary action before bonding the elastic laminate to the topsheet substrate. This timing ensures that the elastic strands are already prepared to retract to the bonded regions, preventing them from becoming ensnared in tack-down bonds during the bonding process and eliminating harmful unretracted elastic ends while maintaining manufacturing simplicity.
Solution Approach 2:
The patent converts the potential harm of unretracted elastic ends into a benefit by using the severing process to create controlled retraction points. The non-bonded regions that initially seem like weaknesses are actually designed to allow elastic strands to retract properly, transforming what could be a defect into a functional feature that prevents harmful bonding while maintaining ease of manufacture.
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 approach enhances the aesthetic appearance and consistency of the leg cuffs by ensuring proper retraction of elastic ends, improving the manufacturing process and the overall performance of the diapers.
Implementation Method 1
advancing elastic strands in the machine direction in a stretched state; intermittently bonding the elastic strands in the stretched state to the first surface of the leg cuff substrate
Implementation Method 2
folding the first edge region of the leg cuff substrate onto a portion of either the first edge region, the central region, or the second edge region of the leg cuff substrate such that the stretched elastic strands are positioned between the first surface of the folded first edge region and the first surface of the portion
Implementation Method 3
severing elastic strands in the non-bonded regions of the elastic laminate to form a continuous length of leg gasketing assemblies having elastic regions intermittently spaced along the machine direction between deactivated regions
Implementation Method 4
bonding the continuous length of leg gasketing assemblies with the continuous topsheet substrate
Data Source
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Figure 1A
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AI summary
The present disclosure relates to methods and apparatuses for assembling absorbent articles that include leg cuff gasketing assemblies. As discussed in more detail below, each leg gasketing assembly may be formed from elastic laminates having stretched elastic strands intermittently bonded thereto. As such, the elastic laminate includes bonded regions and non bonded regions intermittently spaced along the machine direction. The elastic strands are then intermittently deactivated by severing the strands in the non bonded regions of the continuous elastic laminate to form continuous lengths of leg gasketing assemblies having elastic regions and deactivated regions. The continuous lengths of leg gasketing assemblies may then bonded to a continuous topsheet substrate. In some embodiments, the elastic laminate may be combined with the topsheet substrate before severing the strands in the non bonded regions.