Porous Active Particle Filter for Tobacco Smoke
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tobacco smoke filters using carbon blocks bonded with high melt flow polymers suffer from block-to-block variation in performance, leading to ineffective smoke component removal and commercialization issues due to reduced surface area and pressure drop variability, which are critical for uniform cigarette production.
Innovation Solution
A porous mass of active particles and binder particles, where the active particles comprise 1-99% of the mass and are bound together at randomly distributed points, enhancing smoke flow while maintaining a high surface area and minimizing pressure drop, using low melt flow polymers like ultra-high molecular weight polyethylene to ensure uniformity and effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If high melt flow polymers are used to bond carbon particles in porous blocks, then the blocks can be manufactured, but block-to-block variation in performance increases and surface area is reduced
Solution Approach 1:
The patent changes the key parameter of polymer melt flow index from high ( conventional) to low (0.1-10 g/10min), which fundamentally alters the bonding behavior. This parameter change enables the polymer to bond particles without excessive flow, maintaining particle surface area while achieving consistent block-to-block performance uniformity in mass production
Solution Approach 2:
The patent maintains a highly porous structure with 70-90% void volume by using low melt flow polymers that bond particles at minimal contact points. This preserves the effective surface area of carbon particles while still providing sufficient mechanical integrity for manufacturing and use in cigarette filters
2Strength
If high melt flow polymers are used to bond carbon particles, then the blocks can be formed, but the carbon surface area is masked and effectiveness is reduced
Solution Approach 1:
By changing the melt flow index parameter to low values, the polymer bonds particles with minimal material deposition. This maintains 70-90% of carbon particle surface area exposed and accessible for smoke component adsorption, while still providing adequate bonding strength for structural integrity
Solution Approach 2:
The low melt flow polymer creates localized bonds at particle contact points rather than coating entire particle surfaces. This localized bonding approach provides sufficient mechanical strength while preserving the majority of carbon surface area for its smoke purification function
3Object-affected harmful factors
If conventional porous blocks are used, then smoke filtration is achieved, but pressure drop variability is high
Solution Approach 1:
The low melt flow polymer parameter creates consistent bonding characteristics that produce uniform pore structures across blocks. This results in consistent pressure drop values (6-15 mmH2O/mm block length) and uniform smoke component removal performance, eliminating the high variability seen in conventional blocks
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 porous mass effectively reduces targeted tobacco smoke components such as acetaldehyde, acrolein, benzene, benzo[a]pyrene, and formaldehyde to levels below WHO recommendations, maintaining a low encapsulated pressure drop and maximizing the active surface area, thus addressing the commercialization and performance issues of previous technologies.
Implementation Method 1
The porous mass effectively reduces targeted tobacco smoke components such as acetaldehyde, acrolein, benzene, benzo[a]pyrene, and formaldehyde
Data Source
AI summary
A tobacco smoking device comprises a porous mass of active particles adapted to enhance a tobacco smoke flowing over said active particles and binder particles. The active particles comprises about 1-99% weight of the porous mass, and the binder particles comprises about 1-99% weight of said porous mass. The active particles and said binder particles are bound together at randomly distributed points throughout the porous mass. The active particles have a greater particle size than the binder particles.