Biodegradable Cigarette Filter with Cellulose Acetate Coating
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Solution Overview
Problem
Conventional cigarette filters are slow to degrade in disposal environments due to their tightly bound design, which insulates them from environmental effects, and existing attempts to enhance biodegradability have not successfully combined rapid degradation with the desired smoke flavor profile.
Innovation Solution
A biodegradable fiber or paper substrate coated with cellulose acetate and/or plasticized cellulose acetate is used in cigarette filters, incorporating biodegradable materials like polyhydroxyalkanoate and polylactic acid, which are configured to degrade quickly in various disposal environments while maintaining the desired smoke flavor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cellulose acetate filters are tightly bound to provide filtering effect, then filtration performance is improved, but biodegradability deteriorates
Solution Approach 1:
The filter is divided into two distinct segments: a biodegradable core material (starch, cellulose, or natural fiber) that degrades quickly in disposal environments, and an outer cellulose acetate coating that provides the necessary filtering performance and structural integrity during use. This segmentation allows each component to fulfill its specific function optimally.
Solution Approach 2:
The invention uses a composite structure combining biodegradable materials (starch, cellulose, or natural fiber) with cellulose acetate coating. This composite approach enables the filter to exhibit both rapid biodegradability from the core and effective filtration from the coating, resolving the contradiction between these two requirements.
2Duration of action of stationary object
If biodegradable materials are used to enhance degradation rate, then biodegradability is improved, but smoke flavor quality deteriorates
Solution Approach 1:
Different parts of the filter have different properties: the inner core uses biodegradable materials for rapid degradation, while the outer coating uses cellulose acetate with specific surface chemistry to provide desired smoke flavor. This local differentiation allows each region to optimize its function without compromising the other.
Solution Approach 2:
The invention modifies the surface chemistry parameters of the biodegradable core by coating it with cellulose acetate, which alters the interaction with smoke components and provides the desired flavor profile. This parameter change (surface chemistry modification) enables the biodegradable core to also contribute to acceptable smoke flavor.
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 enables cigarette filters to biodegrade rapidly in common disposal environments, such as landfills and composting, while providing a smoke flavor similar to traditional filters, thus addressing the slow degradation and flavor profile challenges of existing technologies.
Implementation Method 1
The surface chemistry of cellulose acetate and plasticizer provide for a smoke flavor that is widely desired and accepted by smokers. This may be due in part to their well-known ability to reduce naturally occurring phenolic compounds from tobacco smoke.
Data Source
AI summary
A biodegradable bi-component fiber may include a polyhydroxyalkanoate and/or polylactic acid with cellulose acetate and/or plasticized cellulose acetate for use in a filter material configured for use in a filter of a smoking article. The bi-component fiber may have a sheath-core construction where one component of the bi-component forms the core, and the other component forms the sheath of each fiber. A filter made in accordance with this design may also include non-biodegradable material.