Laminated Paper Web Bonding Pattern for Soft Delamination Resistance
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Solution Overview
Problem
Existing absorbent paper articles, such as wipes and toilet paper, face issues with delamination and stiffness due to inadequate bonding patterns, leading to compromised absorbency and handling properties.
Innovation Solution
An absorbent laminated paper article with an oversized bonding pattern featuring intermeshing bonding lines that form an interlocking network, providing sufficient bonding while maintaining flexibility and preventing delamination, achieved through a specific arrangement of bonding lines that create large unbonded areas and undulating patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied in a closely spaced pattern of bonding elements distributed over the whole surface, then strong attachment between plies is achieved, but the paper article becomes unduly stiff and difficult to fold
Solution Approach 1:
The bonding pattern is segmented into discrete bonding lines rather than continuous coverage. The bonding elements are arranged along specific lines that extend from one edge to another, creating distinct bonded regions separated by unbonded areas. This segmentation provides strong attachment where needed while maintaining flexibility in unbonded regions.
Solution Approach 2:
Different regions of the paper article have different bonding characteristics. Bonding lines are strategically positioned to provide strong attachment at critical areas while leaving other areas unbonded to maintain flexibility. The bonding pattern creates a non-uniform structure with locally optimized properties for different functional requirements.
2Ease of operation
If mechanical embossing is applied along two parallel edges only, then the article remains soft and flexible, but the plies tend to separate or delaminate in the area between bonding lines
Solution Approach 1:
The bonding pattern extends from one-dimensional edge bonding to a two-dimensional network of intersecting bonding lines. Multiple sets of bonding lines intersect to form a grid-like structure that provides comprehensive delamination resistance while still maintaining large unbonded areas for flexibility. This dimensional expansion of the bonding pattern solves the delamination problem without sacrificing softness.
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 the softness, flexibility, and resistance to delamination of absorbent paper articles, improving their absorbency and handling properties while allowing for continuous production processes and decorative patterns.
Implementation Method 1
at least two plies being bonded together by an adhesive applied in a bonding pattern between the plies
Data Source
AI summary
An absorbent laminated paper article is a rectangular sheet having first parallel edges in a first direction, second parallel edges in a second perpendicular direction and an article area delimited by the edges. The article includes at least two plies adhesively bonded in a bonding pattern between the plies. The bonding pattern includes bonding elements arranged along a first set of bonding lines extending from one of the first parallel edges to the other of first parallel edges in a first direction at a first angle to the first direction and along a second set of bonding lines extending from the one of first parallel edges to the other of first parallel edges in a second direction at a second angle to the first direction, the first set of bonding lines intersecting with the second set and forming an intermeshing network of bonding lines.