Compliant Rollers for Absorbent Article Conveyance
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Solution Overview
Problem
Conveyors used in absorbent article manufacturing fail to account for variations in thickness, leading to jams and line shutdowns due to inadequate grip on both thin and thick sections of flexible products.
Innovation Solution
The use of compliant rollers in a conveyance apparatus with endless belts that deform to accommodate varying thicknesses, ensuring continuous contact and stable transport of absorbent articles through a nip region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If opposed conveyors are positioned to have a nip with a relatively large gap, then they can accommodate thick sections of the flexible product, but they cannot adequately grip thin sections leading to transport failures
Solution Approach 1:
The conveyor system uses compliant rollers that can dynamically adjust their position and deformation based on the local thickness of the flexible product. The rollers deform more when encountering thin sections and less when encountering thick sections, maintaining consistent contact pressure and grip reliability across varying thicknesses
Solution Approach 2:
The system changes the physical state of the rollers from rigid to compliant, allowing them to deform elastically in response to thickness variations. This parameter change enables the rollers to adapt their contact pressure automatically, ensuring reliable grip on both thin and thick sections without manual adjustment
2Device complexity
If rigid conveyors are used to transport the flexible product, then the structure is simple, but they fail to account for thickness variations causing jams and line shutdowns
Solution Approach 1:
The patent replaces rigid conveyor components with flexible compliant rollers that can deform to match the contour of the flexible product. This flexibility allows the rollers to maintain contact across thickness variations without causing jams, ensuring continuous operation while adding only minimal complexity through the use of elastomeric materials
3Reliability
If the nip gap is reduced to grip thin sections, then grip reliability improves, but thick sections cannot be accommodated causing transport failures
Solution Approach 1:
The compliant rollers dynamically adjust their effective nip gap through elastic deformation. When encountering thin sections, the rollers deform more to maintain contact pressure; when encountering thick sections, they deform less. This dynamic adjustment maintains both grip reliability and thickness accommodation simultaneously
Solution Approach 2:
The compliant rollers are pre-loaded with sufficient force to ensure contact with the flexible product. This preliminary action of pre-loading allows the rollers to immediately respond to thickness variations without requiring active control or adjustment mechanisms during operation
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 compliant rollers maintain contact with both thin and thick areas of the substrate, preventing jams and ensuring smooth transport of absorbent articles, enhancing production efficiency by accounting for thickness variations.
Implementation Method 1
Each compliant roller may be elastomeric and adapted to provide a reaction force normal to the endless belt along the machine and/or cross direction of the nip region
Data Source
Figure 1
Figure 2A~3B
Figure 2B
AI summary
The apparatuses and methods herein may be configured to transport articles in the form of continuous lengths of substrates having thicknesses that varies along a machine direction and/or cross direction. The conveyance apparatuses may be configured to include a first carrier and second carrier, wherein each carrier includes an endless belt positioned adjacent to the other so as to define a nip region between the endless belts, the nip region extending in a machine direction and a cross direction. The carriers may also include compliant rollers in rolling contact with the endless belts. Each compliant roller may be elastomeric and adapted to provide a reaction force normal to the endless belt along the machine and/or cross direction of the nip region. As such, the compliant rollers help maintain and hold the endless belts in contact with both relatively thin and thick areas of the substrate advancing through the nip region.