Deep-Nested Embossed Paper Strength via Rounded Protrusion Corners
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Solution Overview
Problem
Deep-nested embossing of paper products often results in significant loss of paper strength, which detracts from the product's acceptance despite improved aesthetic appeal.
Innovation Solution
An apparatus comprising two rotatable embossing cylinders with coordinated non-random protrusions that engage each other to a depth greater than 1.016 mm, maintaining paper strength by using protrusions with rounded corners and a radius of curvature between 0.076 mm and 1.778 mm, allowing for deep-nested embossing while preserving the paper's initial strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If deep-nested embossing is performed with traditional protrusions, then aesthetic appearance and absorbency are improved, but paper strength deteriorates significantly
Solution Approach 1:
The patent applies spheroidality by replacing traditional sharp-cornered protrusions with rounded protrusions having a radius of curvature between 0.076 mm and 1.778 mm. This curvature prevents stress concentration at sharp corners during embossing, thereby maintaining paper strength while achieving deep nested embossment patterns with average height of at least 650 μm that preserve more than 85% of the original wet burst strength.
2Shape
If protrusion engagement depth is increased for deeper embossing, then aesthetic appeal improves, but paper strength loss increases
Solution Approach 1:
The patent changes the geometric parameters of the protrusions by specifying a radius of curvature between 0.076 mm and 1.778 mm, which optimizes the balance between embossment depth (average height of at least 650 μm) and paper strength retention (greater than 85% of unembossed wet burst strength). This parameter optimization allows deep nested embossing without excessive strength loss.
3Strength
If rounded protrusions with specific radius of curvature are used, then paper strength is maintained, but manufacturing complexity increases
Solution Approach 1:
The patent defines specific parameter ranges for the protrusions (radius of curvature between 0.076 mm and 1.778 mm) that can be implemented using standard manufacturing techniques. These parameter specifications provide clear manufacturing guidelines that balance the need for rounded protrusions to maintain paper strength with the practical constraints of manufacturing complexity.
Data Source
AI summary
The present invention relates to an apparatus for producing a deep-nested embossed paper product comprising two embossing cylinders, each cylinder having a plurality of protrusions on its surface. The protrusions on each cylinder are disposed in a non-random pattern where the respective non-random patterns are coordinated to each other. The two embossing cylinders are aligned such that the respective coordinated non-random pattern of protrusions nest together such that the protrusions engage each other to a depth of greater than about 1.016 mm. The protrusions each comprise a top plane and sidewalls, with the top plane and sidewalls meeting at a protrusion corner. The protrusion corners of the protrusions of the embossing cylinders of the apparatus of the present invention have a radius of curvature ranging from about 0.076 mm to about 1.778 mm.