Uncrimped Cellulose Acetate Thread for Cigarette Filters and Smoke Resistance
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Solution Overview
Problem
Cotton threads used in cigarette filters are prone to discolouration due to smoke penetration, and standard dyes applied to cotton may leach into the filter material, posing regulatory and aesthetic issues.
Innovation Solution
Using cellulose acetate filaments for the central thread in cigarette filters, which are uncrimped and densely packed, providing an ordered structure that resists smoke staining and incorporates colour-fast pigments, ensuring uniform flavour distribution and improved positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cotton thread is used as the central thread in the filter, then flavour absorption is achieved, but discolouration occurs due to smoke penetration
Solution Approach 1:
The patent changes the material parameter from cotton to cellulose acetate for the central thread. This material substitution maintains the flavour absorption capability while eliminating the discolouration problem, as cellulose acetate does not stain with smoke in the same way cotton does.
Solution Approach 2:
The patent uses cellulose acetate, a synthetic material with different chemical properties compared to natural cotton. This composite approach combines the flavour-absorbing capability with smoke resistance, creating a thread that performs both functions without the drawbacks of cotton.
2Object-affected harmful factors
If dye is applied to cotton thread to mask discolouration, then aesthetic appearance is improved, but dye leaching occurs into the filter material
Solution Approach 1:
Instead of applying temporary surface dyes that can leach, the patent uses inherently colour-fast cellulose acetate material. The material itself provides the colour stability without requiring additional dye coatings that could detach or leach into the filter.
Solution Approach 2:
The patent changes the material property from cotton (which requires dyeing) to cellulose acetate (which is naturally colour-fast). This parameter change eliminates the need for surface dyes and prevents leaching issues at the material level.
3Object-affected harmful factors
If standard vat dyes are applied to cotton thread, then colour masking is achieved, but regulatory approval is not obtained for food/cigarette use
Solution Approach 1:
The patent eliminates the need for regulatory-approved food-grade dyes by using cellulose acetate material that is inherently colour-fast and does not require additional dyeing. This approach bypasses the regulatory hurdle entirely while maintaining aesthetic appearance.
Solution Approach 2:
The patent changes the material from cotton (requiring food-grade dyes) to cellulose acetate (naturally colour-fast). This parameter change removes the regulatory barrier by eliminating the need for food-contact approved dyes, as the material itself maintains colour stability without leaching.
4Shape
If crimped cellulose acetate filaments are used, then filter rod structure is achieved, but smoke penetration and staining occur
Solution Approach 1:
The patent changes the physical structure parameter from crimped to uncrimped filaments for the central thread. This structural modification creates a tighter, more compact configuration that resists smoke penetration while maintaining the filter rod's overall structure.
Solution Approach 2:
The patent uses uncrimped cellulose acetate filaments arranged in a specific configuration to create a dense, smoke-resistant structure. This composite arrangement provides both structural integrity and protection against smoke staining.
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 cellulose acetate thread effectively prevents smoke-induced discolouration, maintains regulatory compliance, and enhances flavour delivery with visible colour differentiation for quality assurance.
Implementation Method 1
The cellulose acetate thread comprises an ordered arrangement of cellulose acetate filaments arranged substantially parallel to the central cylindrical axis of the filter rod. The cellulose acetate thread is therefore structurally distinct from the cellulose acetate tow, and the filaments of the cellulose acetate thread do not generally intermingle with those of the cellulose acetate tow.
Implementation Method 2
The cellulose acetate thread generally incorporates a flavourant, such as menthol, or any other desired additive.
Data Source
Figure 1~2
Figure 3~4
AI summary
A filter for a cigarette comprises a porous filter rod (3) a material sheet (2) wrapped around the filter rod and a cellulose acetate thread (4) formed from substantially uncrimped cellulose acetate filaments. The cellulose acetate thread is positioned within the filter rod and extends along the central axis of the filter rod.