Roll of fibrous cellulose-based product
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Solution Overview
Problem
Conventional cellulose wadding products, such as toilet paper rolls, face issues with stiffness, weakened resistance, and unsightly pattern cuts due to uniform glue application and mechanical embossing, which compromise flexibility, softness, and aesthetic appeal.
Innovation Solution
A new association scheme is introduced where bonding points are moved to the periphery of the product, creating a technical zone for rigidity and a use zone for softness, with the glue applied only in a peripheral zone to maintain flexibility and prevent pattern cuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glue is applied uniformly over the entire surface of the folds, then the association of plies is strengthened, but the sheet becomes stiff and the embossing pattern is disrupted at the edges
Solution Approach 1:
The patent applies glue only in a peripheral zone rather than uniformly across the entire surface. This local application strategy strengthens the association of plies at the edges where it is most needed for structural integrity, while leaving the central zone free of glue to maintain flexibility, softness, and preserve the aesthetic embossing pattern.
2Shape
If mechanical embossing is applied to the entire surface, then the aesthetic appearance is improved, but the resistance is weakened in the zone of use due to fiber destruction
Solution Approach 1:
The patent applies mechanical embossing only in the peripheral zone rather than across the entire surface. This localized approach provides aesthetic appearance at the edges where patterns are less likely to be cut or damaged, while preserving the structural integrity and resistance of the central zone where the embossing would otherwise destroy fibers and create weakness.
3Shape
If patterns are made large in surface area, then the aesthetic appeal is enhanced, but the patterns are more likely to be cut and reveal weakened areas
Solution Approach 1:
The patent confines large aesthetic patterns to the peripheral zone where they are less susceptible to being cut by the four edges delimiting the sheet. This allows for visually appealing large patterns without compromising the integrity of the pattern or creating weakened areas, as the peripheral location naturally protects against edge cutting.
4Strength
If glue application is associated with embossing pattern, then the bonding is enhanced, but a continuous succession of embossed patterns is created that must be cut at the edges
Solution Approach 1:
The patent applies both glue and embossing patterns locally in the peripheral zone rather than across the entire sheet. This creates a continuous succession of embossed patterns only in the peripheral region, which maintains bonding strength where applied while preventing patterns from being cut at the edges, thus preserving aesthetic appearance.
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 product's flexibility, resistance, and aesthetic appeal by reducing stiffness and pattern disruption, while maintaining sufficient cohesion and resistance to delamination.
Implementation Method 1
the association of the plies in a multi-ply product essentially made of cellulose wadding is carried out by the application of a glue between said plies
Data Source
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AI summary
The present invention relates to the field of cellulose wadding products for sanitary or domestic use and in particular to products in roll form, such as rolls of toilet paper (or hygiene paper) and the like. The subject of the invention is a roll of fibrous cellulose-based product, characterized in that it comprises a wound web of cellulose wadding sheets (2) separated by perforated or prescored lines (4), the individual plies (3) of each sheet (2) being bonded to a peripheral surface (5) comprising between 4% and 60% of the total area of each sheet (2).