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 due to embossing patterns, and unsightly pattern cuts when unrolled, compromising flexibility, softness, and aesthetic appeal.
Innovation Solution
A new association scheme is introduced where bonding points are moved to the periphery of the sheets, creating a technical zone for rigidity and a use zone for softness, with the embossing patterns confined to the central area, allowing for a higher frequency of unique patterns without edge cuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If embossing patterns are applied over the entire surface of the product, then aesthetic appearance is improved, but resistance and flexibility are weakened due to fiber destruction in pattern zones
Solution Approach 1:
The embossing pattern is applied only in the central zone of the sheet, leaving the peripheral zone (within 10 mm of edges) unembossed. This local differentiation allows the central zone to provide aesthetic appearance while the peripheral zone maintains full fiber integrity and strength for tearing resistance.
2Strength
If glue is deposited uniformly over the entire surface to bond folds, then association strength is improved, but sheet flexibility is reduced and winding becomes more difficult
Solution Approach 1:
Glue is applied only in the peripheral zone within 10 mm of the sheet edges, concentrating the bonding function at the boundaries where folds need to be associated. The central zone remains free of glue, preserving flexibility and enabling easier winding operations.
3Shape
If embossing patterns are large in size, then aesthetic impact is improved, but pattern cuts at edges become more visible and weaken connections
Solution Approach 1:
The embossing pattern is confined to the central zone, away from the sheet edges. This ensures that even large aesthetically impactful patterns will not be cut by edge trimming or perforation lines, maintaining both aesthetic integrity and connection strength at the edges.
4Shape
If mechanical embossing is applied to the entire surface, then aesthetic appearance is improved, but a back side effect occurs with protuberances causing accelerated piercing
Solution Approach 1:
Mechanical embossing is applied only in the central zone of the sheet, creating aesthetic protuberances away from the peripheral zone. This prevents the back side effect where protuberances would otherwise cause accelerated piercing at the edges, while still providing aesthetic appearance in the use area.
Data Source
Figure 1~2
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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).