Single-Ply Tissue Deep Nested Embossing for High Bulk
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Solution Overview
Problem
Deep nested embossing processes tend to tear the fibrous structure of single-ply tissue products, reducing their strength and integrity, making it difficult to achieve high absorbency and bulk without significant tearing.
Innovation Solution
A deep nested embossing process is applied to a single-ply tissue-towel paper product with a fibrous structure that maintains physical integrity, achieving an embossment height of at least 650 μm on both surfaces, resulting in high absorbency and bulk without significant tearing, using a combination of embossing rolls with matched protrusions to create a continuous ply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If deep nested embossing process is applied to single-ply tissue products, then absorbency and bulk are improved, but the fibrous structure tears and strength is reduced
Solution Approach 1:
The patent changes the physical parameters of the tissue product by applying deep nested embossing with controlled protrusion depth (at least 25% of the tissue thickness) and specific engagement conditions. This creates high bulk regions with enhanced absorbency while maintaining overall product integrity through controlled parameter adjustment rather than uniform treatment.
Solution Approach 2:
The embossing process creates localized high bulk regions with increased absorbency through nested protrusions, while the surrounding areas maintain their original strength characteristics. The local quality change is achieved by concentrating the embossing effect in specific zones rather than uniformly across the entire tissue surface.
2Volume of moving object
If deep nested embossing process is applied to single-ply tissue products, then bulk is improved, but the fibrous structure tears and integrity is reduced
Solution Approach 1:
The patent controls the embossing parameters including protrusion depth (at least 25% of tissue thickness), engagement pressure, and temperature conditions to achieve high bulk (embossment height of at least 650 μm) while preventing fibrous structure failure. The parameter optimization allows bulk enhancement without compromising integrity.
Solution Approach 2:
The process applies controlled engagement conditions and temperature (at least 40°C) before the embossing protrusions contact the tissue, preparing the fibrous structure to accommodate the deformation. This preliminary conditioning prevents sudden stress concentration that would cause tearing during the embossing process.
3Quantity of substance
If deep nested embossing process is applied to single-ply tissue products, then absorbency is improved, but tearing occurs and strength efficiency is reduced
Solution Approach 1:
The patent optimizes embossing parameters including protrusion depth, engagement pressure, and temperature (at least 40°C) to enhance absorbency in the embossed regions while preventing fibrous structure failure. The controlled parameter adjustment creates high absorbency zones without inducing tearing.
Solution Approach 2:
The patent converts the potential harmful effect of embossing-induced stress into a beneficial outcome by controlling the protrusion depth and engagement conditions. The stress that would normally cause tearing is instead used to create controlled high bulk regions with enhanced absorbency, transforming a potential defect into a functional advantage.
Data Source
AI summary
The present invention relates to absorbent tissue-towel paper products comprising one essentially continuous ply of fibrous structure having a first surface and a second surface, wherein the product has an HFS absorbency greater than 8 g/g and the first surface exhibits an embossment height of at least 650 μm and the second surface exhibits an embossment height of at least about 650 μm.