Composite Cigarette Filter with PLA Fibers
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Solution Overview
Problem
Existing cigarette filters made from non-cellulose acetate materials like polylactide (PLA) fibers lack sufficient rigidity and hardness due to inadequate firmness enhancement by traditional cellulose acetate plasticizers, which affects their performance as smoking article filters.
Innovation Solution
A method and device for producing a filter segment by inserting a region of non-plasticized PLA fibers into a plasticized cellulose acetate fiber structure, where the PLA fibers can comprise up to 60% of the filter segment volume, and the cellulose acetate fibers are plasticized with triacetin to provide the necessary rigidity and hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-cellulose acetate materials like PLA fibers are used in cigarette filters, then sustainability and selectivity are improved, but rigidity and hardness deteriorate
Solution Approach 1:
The patent creates a composite filter structure by inserting PLA fibers into a cellulose acetate matrix. The cellulose acetate provides rigidity and hardness while the PLA fibers contribute sustainability and selectivity properties. This composite approach allows both materials to work together, achieving a balance between mechanical strength and environmental benefits.
Solution Approach 2:
The invention applies local quality by creating regions with different material compositions within the filter. The filter contains both plasticized cellulose acetate regions (providing structural integrity) and non-plasticized PLA fiber regions (providing sustainability and selectivity). This localized differentiation allows each material to contribute its optimal properties to specific areas of the filter.
2Strength
If traditional cellulose acetate plasticizers are used, then rigidity and hardness are improved, but compatibility with non-cellulose acetate materials deteriorates
Solution Approach 1:
The patent applies local quality by creating distinct regions within the filter: plasticized cellulose acetate regions for structural integrity and non-plasticized PLA fiber regions for sustainability. This localized differentiation prevents the plasticizer from interfering with the PLA fibers while still providing rigidity where needed.
Solution Approach 2:
The filter is segmented into different material zones - the cellulose acetate matrix with plasticizer and the embedded PLA fiber regions. This segmentation isolates the plasticizer to specific areas, preventing it from degrading the PLA fibers while maintaining the necessary mechanical properties in the cellulose acetate regions.
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 enhances the rigidity and hardness of the filter segment, improving its filtration properties and durability, while allowing for the benefits of both materials to be utilized, such as increased selectivity and sustainability.
Implementation Method 1
generating a fluid stream and transferring a first fibrous material along a transfer path through the fluid stream, and then into a flow of a second fibrous filter material
Data Source
Figure 1a~1d
Figure 1e
Figure 2
AI summary
The invention relates to a filter for a smoking article, a method of production thereof, a smoking article and a device for inserting a first fibrous filter material into a second fibrous filter material to form a filter for a smoking article. Particularly but not exclusively the invention relates to a smoking article filter segment including a region of first fibrous filter material disposed within a region of second fibrous filter material and a method of production thereof. The first fibrous filter material in some embodiments comprises greater than 10% by volume of the total filter segment volume and in some embodiments the first fibrous material comprises PLA fibres and the second fibrous filter material comprises CA fibres.