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 stiffening due to uniform glue application, leading to weakened resistance and unsightly pattern cuts, which compromise flexibility, softness, and aesthetic appeal, especially when large patterns are involved.
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 representing between 4% and 60% of the sheet's surface, ensuring flexibility and resistance while maintaining aesthetic appeal.
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 flexibility is reduced
Solution Approach 1:
The patent applies glue only in a peripheral zone rather than uniformly across the entire surface. This localized application provides sufficient association strength at the edges where plies need to be secured, while leaving the central area free of glue to maintain flexibility and softness for user comfort.
2Shape
If large embossed patterns are used to cover the entire surface, then aesthetic appearance is improved, but the patterns are cut by edges and weakened areas are revealed
Solution Approach 1:
The patent positions the embossed pattern entirely within the central zone, away from the peripheral bonding zone. This ensures the pattern remains intact and aesthetically pleasing without being cut by edges, while the peripheral zone provides structural strength through glue application.
3Strength
If mechanical crushing is used to associate folds, then association is achieved, but the back side effect and accelerated piercing occur
Solution Approach 1:
The patent replaces mechanical crushing with chemical bonding using glue applied in the peripheral zone. This substitution achieves fold association without creating protuberances on the back side, thereby eliminating the tent canvas effect and accelerated piercing issues.
4Ease of operation
If peripheral zone for bonding is reduced to 4%-60% of sheet surface, then flexibility and softness are improved, but bonding area is reduced
Solution Approach 1:
The patent optimizes the peripheral zone to occupy 4%-60% of the total sheet surface area. This parameter range provides sufficient bonding area to maintain association strength while leaving the majority of the central area free for flexibility, softness, and aesthetic patterns.
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 product's flexibility, resistance, and softness, with improved resistance to tearing and wet conditions, while maintaining a presentable appearance by reducing the association surface area and minimizing pattern cuts, resulting in a 20% improvement in dry resistance and 7% in cross-direction resistance.
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
Implementation Method 2
another, equally classic, type of association of folds which is purely mechanical and which consists of locally deforming, by crushing, the folds to be linked
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 is particularly concerned with roll products such as toilet paper rolls and the like. It relates to a roll of fibrous cellulose product characterized in that it comprises a rolled strip of sheets (2) of cellulose wadding separated by perforated or pre-cut lines (4), the individual plies (3) of each sheet (2) being glued on a peripheral surface (5) comprising between 4% and 60% of the total surface area of each sheet (2).