Embossing Roll with Variable Protrusion Geometry
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Solution Overview
Problem
Conventional embossing technologies for producing multi-ply fibrous products, such as tissue paper, limit the versatility of optical appearances and mechanical properties due to standardized embossing patterns and material constraints, leading to suboptimal bulk softness and stability.
Innovation Solution
A method using an embossing roll with a structurized surface featuring male protrusions or female depressions of varying heights and angles, allowing for a freely shaped three-dimensional geometry that translates into a fibrous product with unique embossing patterns, and optionally using mechanical ply bonding and colored adhesives for enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional standardized embossing patterns are used, then the manufacturing process is simple and reliable, but the versatility of optical appearances and mechanical properties is limited
Solution Approach 1:
The embossing roll features dynamically varying protrusion heights and angles around its circumference, allowing the embossing pattern to change continuously along the web width. This dynamic geometry enables a single roll to produce multiple embossing variants by adjusting position, eliminating the need for multiple standardized rolls and achieving versatile optical appearances through geometric variation rather than discrete pattern repetition.
Solution Approach 2:
Different regions of the embossing roll surface have locally optimized properties - protrusions with varying heights, angles, and densities are positioned at specific locations to create corresponding variations in the embossed pattern. This local quality differentiation allows each region to contribute distinct visual and tactile characteristics, enabling complex multi-pattern embossing from a single standardized roll structure.
2Strength
If conventional standardized embossing patterns are used, then the manufacturing process is reliable, but the bulk softness and mechanical properties are suboptimal
Solution Approach 1:
The embossing roll systematically varies critical geometric parameters including protrusion height, angle, and spacing along the roll circumference. By changing these parameters dynamically during the embossing process, the technique creates optimized local structures that enhance bulk softness through controlled deformation of fibrous material, while maintaining overall mechanical strength through the distributed pattern of embossed elements.
Solution Approach 2:
The embossing roll introduces variation in the vertical dimension by creating protrusions of different heights and angles that extend radially outward. This three-dimensional geometric complexity translates into corresponding depth variations in the embossed pattern, enabling enhanced bulk softness through multi-level surface structure while maintaining structural integrity through the distributed mechanical interlocking of varying-depth features.
3Adaptability or versatility
If materials with different properties are used to achieve diverse embossing effects, then the versatility of visual effects is improved, but the device complexity and material constraints increase
Solution Approach 1:
A single embossing roll design serves multiple functions by incorporating varying protrusion geometries that can produce different visual effects depending on the fibrous material properties and processing conditions. The universal roll structure with its systematically varied pattern can create diverse embossing effects - from subtle texture changes to pronounced three-dimensional patterns - without requiring multiple specialized rolls or material-specific tooling, thereby reducing device complexity while maintaining versatility.
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 method enhances the optical appearance and mechanical properties of fibrous products by creating complex, customizable embossing patterns that improve bulk softness and stability, offering a higher range of possible geometries and visual effects.
Implementation Method 1
The embossing roll has a structurized embossing surface with male protrusions or female depressions starting from a base circumferential surface of the roll. The embossing pattern is characterized by different base areas, different heights in a radial direction, and different angles between side wall sections and the adjacent base circumferential surface.
Implementation Method 2
bonding together the top ply and the further ply in the nip between the embossing roll and a marrying roll or in the nip between the embossing roll and a second embossing roll for embossing the further ply
Data Source
Figure 1
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AI summary
An embossing roll (10) for producing fibrous products, especially tissue paper products, non-woven products or a hybrid thereof, and preferably hygiene and cleaning products, has a structurized embossing surface suitable to run against an anvil roll. The structurized embossing surface comprises male protrusions or female depressions (16) starting from a base circumferential surface (12) of the roll (10). The embossing pattern is characterized by the following features: the base areas (Al, A2) of selected male protrusions or female depressions (16) in the base circumferential surface (12) are different; the heights or depths (D1 D2) of selected male protrusions or selected female depressions (16) in a radial direction of the roll (10) and starting from the base circumferential surface (12) are different; and the angles (a1, a2) between sidewall sections (17) and the adjacent base circumferential surface (12) of selected male protrusions and/or female depressions (16) are different.