Transparent Wrapper Seam for Smoking Articles
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Solution Overview
Problem
Conventional transparent wrappers in smoking articles have visible seams when using adhesives like PVA or hot melt adhesive, which are not transparent, making it difficult to achieve a fully transparent appearance and requiring registration with cut-out windows in tipping paper.
Innovation Solution
A substantially transparent wrapper made from an acetate ester of cellulose with an ester of glycerol, such as triacetin, is used to create a seamless overlap between edges, allowing light transmission and maintaining transparency, eliminating the need for registration with underlying tipping paper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive such as PVA or hot melt adhesive is used to secure the opposed edges of the substantially transparent wrapper, then the wrapper edges are joined together, but the seam becomes visible and transparency is lost
Solution Approach 1:
An intermediary substance (adhesive or coating composition) is applied to the overlapping edges to join them while maintaining transparency. The intermediary is specifically formulated to be substantially transparent when cured, allowing the seam to be invisible or minimally visible while providing the necessary bonding strength to secure the wrapper edges together.
Solution Approach 2:
The optical parameters of the adhesive or coating composition are changed to achieve transparency. By selecting materials with refractive indices matched to the wrapper material and ensuring the cured adhesive has optical properties similar to the wrapper, the seam becomes substantially invisible while maintaining structural integrity.
2Illumination intensity
If a transparent polymeric tipping wrapper is used, then consumers can observe the smoking article through the wrapper, but the surface feel is different from traditional paper and is disliked by consumers
Solution Approach 1:
A composite structure is created by combining a transparent polymeric wrapper with a paper tipping wrapper that has a window. The paper wrapper provides the desired tactile surface feel that consumers expect, while the transparent polymeric wrapper underlying it allows visibility of the smoking article through the window portion.
Solution Approach 2:
The wrapper structure has different properties in different regions: the paper tipping wrapper portion provides the desired surface feel and opacity where needed, while the transparent polymeric wrapper portion allows visibility through the window. This local differentiation of material properties satisfies both consumer tactile preferences and transparency requirements.
3Illumination intensity
If a cut-out window is provided in opaque tipping paper to allow observation, then consumers can see the underlying portion, but registration is required to avoid placing the seam under the window
Solution Approach 1:
The seam-forming adhesive or coating composition is applied in a controlled manner that excludes the window region. By taking out the window area from the adhesive application zone, the seam is automatically positioned away from the window, eliminating the need for precise registration between the seam and window locations.
Solution Approach 2:
A substantially transparent adhesive or coating composition is used as an intermediary to join the wrapper edges. Because this intermediary is transparent, even if the seam falls within or near the window region, it remains substantially invisible, thereby eliminating the need for precise registration to avoid placing the seam under the window.
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 solution results in a transparent seam that matches the wrapper's appearance, enabling a fully transparent smoking article without visible seams, allowing consumers to see through the wrapper and enhancing aesthetics.
Implementation Method 1
an agent disposed between the first and second opposed edges of substantially transparent in at least a portion of the longitudinal overlapping region; wherein the substantially transparent wrapper comprises an acetate ester of cellulose, and wherein the agent comprises an ester of glycerol
Data Source
Figure 1~2
Figure 3
AI summary
A mouthpiece for a smoking article comprises at least one mouthpiece element; a substantially transparent wrapper wrapped around the at least one mouthpiece element such that first and second opposed edges of the substantially transparent wrapper (18) overlap with each other along a longitudinal overlapping region; and an agent disposed between the first and second opposed edges of substantially transparent in at least a portion of the longitudinal overlapping region. The substantially transparent wrapper comprises an acetate ester of cellulose, and the agent comprises an ester of glycerol.