Patterned Cigarette Paper for Visual Homogeneity
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Solution Overview
Problem
Cigarette paper exhibits visual inhomogeneities in whiteness and opacity, making the tobacco rod appear non-homogeneous, which is undesirable for premium cigarette brands, and existing methods to increase opacity or whiteness are limited by consumer acceptance, filler content constraints, and legal/toxicological issues.
Innovation Solution
Applying a pattern with specific Tamura coarseness and opacity/whiteness differences to the cigarette paper, where the printed area has a whiteness at least 25% but no more than 60% less than the unprinted area, and opacity higher than the unprinted area, to create a visually more homogeneous appearance without compromising technical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the basis weight of the paper is increased to improve visual homogeneity, then the opacity and whiteness improve, but the paper becomes too thick and consumers reject it
Solution Approach 1:
The patent applies a patterned composition selectively to certain areas of the cigarette paper rather than uniformly increasing the basis weight. This creates local variations in opacity and whiteness that mask visual inhomogeneities while maintaining overall paper thinness and consumer acceptance.
Solution Approach 2:
The patent changes optical parameters (opacity, whiteness) by applying a composition with specific optical properties to the paper surface, rather than changing the fundamental physical parameter of basis weight. This allows visual homogeneity improvement without increasing paper thickness.
2Manufacturing precision
If the filler content is increased to improve visual homogeneity, then the opacity and whiteness improve, but the tensile strength decreases and dust formation increases
Solution Approach 1:
Instead of uniformly increasing filler content throughout the paper which would weaken it, the patent applies a composition locally in a pattern. This provides the needed optical masking effect without the negative structural consequences of high filler content.
Solution Approach 2:
The patent uses a composition as an intermediary layer on the paper surface that provides the optical properties needed for visual homogeneity without requiring high filler content in the paper matrix itself, thus preserving tensile strength.
3Weight of stationary object
If the paper is made thinner and lighter to improve smoking experience, then the visual inhomogeneities become more pronounced
Solution Approach 1:
The patent applies a composition that creates color/optical variations in a fine pattern on the paper surface. This pattern masks the visual inhomogeneities that become more apparent in thinner papers, allowing the paper to remain thin and light while achieving visual homogeneity.
Solution Approach 2:
The patent addresses a two-dimensional visual problem (inhomogeneity) by introducing a third element - a patterned composition layer with specific optical properties. This additional dimensional approach allows thin papers to achieve visual homogeneity without increasing weight.
4Manufacturing precision
If optical brighteners are used to increase whiteness above 100%, then the visual homogeneity improves, but legal and toxicological restrictions prevent their use
Solution Approach 1:
The patent applies a composition locally in a pattern rather than using optical brighteners uniformly throughout the paper. This achieves the needed visual effect through selective application of materials with acceptable optical properties, avoiding prohibited substances.
Solution Approach 2:
The patent uses a composition that can be applied and dried to provide the needed optical effect without requiring persistent optical brighteners. The effect is achieved through the physical presence of the composition layer rather than chemical fluorescence.
Data Source
AI summary
The invention relates to a cigarette paper onto which a composition is applied in the form of a pattern which has a Tamura coarseness of at most 0.22 mm, preferably at most 0.2 mm. According to ISO 2470-1 the absolute difference in whiteness between an area of the cigarette paper over the whole of which the composition is applied and an area of the cigarette paper onto which the composition is not applied is at least 25% in the dry state, preferably at least 35% and particularly preferably at least 40% and at most 60%, preferably at most 55%. Furthermore, the opacity according to ISO 2471 of an area of the cigarette paper over the whole of which this composition is applied is higher, when the composition is in the dry state, than the opacity of an area onto which this composition is not applied.