Cigarette Filter Flavor Granules with Core-Shell Structure
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Solution Overview
Problem
Cigarette flavors added to filters or tobacco fillers tend to evaporate during storage, leading to insufficient flavor release in mainstream smoke, and the addition of charcoal can dilute the flavor and increase air-flow resistance, while uniform distribution of flavor powders is challenging.
Innovation Solution
Cigarette filters with flavor granules having a core material and a flavor-carrying carrier on their surface, with a grain size distribution where 99% of granules are 100 μm or larger and 70% are 200 μm or larger, allowing uniform addition and maintaining air-flow resistance similar to charcoal filters, preventing flavor evaporation and adsorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If flavor is added to tobacco filler or cigarette paper, then smoking flavor is improved, but flavor evaporates during storage and cannot be released sufficiently into mainstream smoke
Solution Approach 1:
The patent introduces a carrier material (such as cellulose, starch, or sugar) as an intermediary substance to physically adsorb and retain the flavor compound. This carrier acts as a mediator between the flavor and the combustion process, preventing evaporation during storage while enabling controlled release during smoking. The carrier material provides a stable matrix that holds the flavor compound in place until it is activated by the heat of combustion.
Solution Approach 2:
The patent changes the physical state and chemical environment of the flavor compound by incorporating it into a carrier material matrix. This parameter change transforms the flavor from a volatile liquid or solid that evaporates easily to a stabilized form within the carrier structure. The carrier material modifies the physical properties of the flavor, reducing its vapor pressure and preventing premature evaporation while maintaining release capability during smoking.
2Object-affected harmful factors
If charcoal is added to cigarette filter, then substances harmful to smoke are removed, but smoking flavor is diluted and air-flow resistance increases
Solution Approach 1:
The patent segments the filter function into distinct zones: a charcoal portion for harmful substance removal and a flavor portion for flavor delivery. By dividing the filter into separate functional segments rather than mixing all components uniformly, the design allows each zone to perform its specific function optimally without interfering with the other. The flavor granules are placed in a dedicated section where they can release flavor without being diluted by the charcoal material.
Solution Approach 2:
The patent applies local quality by creating different material compositions in different regions of the filter. The flavor granules are formulated with specific carriers and adjuvants that provide optimal flavor release properties, while the charcoal provides filtration properties. Each local region of the filter has tailored properties suited to its specific function, with the flavor granules designed to release flavor efficiently without being affected by the charcoal's adsorptive properties.
3Quantity of substance
If flavor is added to filter in the form of fine powder, then flavor can be incorporated, but uniform distribution is difficult and air-flow resistance increases
Solution Approach 1:
The patent changes the physical parameters of the flavor material by formulating it into granules with specific size distributions (D10, D50, D90 ranges) and incorporating it into a carrier material matrix. This parameter change transforms the fine powder into larger, more manageable granules that can be uniformly distributed throughout the filter using existing filtration equipment. The granulation process creates particles that flow and distribute evenly without creating excessive air-flow resistance.
4Quantity of substance
If flavor is added to filter in the form of fine powder, then flavor can be incorporated, but fine powder drops out of filter and may enter mouth
Solution Approach 1:
The patent changes the physical size parameter of the flavor particles by formulating them into granules with controlled dimensions (D10 ≥ 10 μm, D50 ≥ 30 μm, D90 ≤ 150 μm). This parameter change ensures that the flavor particles are large enough to remain retained within the filter structure during the smoking process and cannot be expelled into the mouth. The granulation process creates particles of optimal size that are retained by the filter medium while still allowing effective flavor release during combustion.
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 ensures consistent flavor release into mainstream smoke without increasing air-flow resistance, allowing for effective use with charcoal and stable flavor retention during storage.
Implementation Method 1
a flavor-carrying carrier adhered to the surface of the core material
Implementation Method 2
flavor can be sufficiently released into mainstream smoke during smoking without evaporating a flavor during a storage period
Implementation Method 3
flavor can be sufficiently released into mainstream smoke during smoking
Implementation Method 4
addition of charcoal to a cigarette filter is one of effective means for removing substances that are desired to be removed from mainstream smoke
Data Source
AI summary
A cigarette filter includes a filter body and flavor granules added to the filter body, wherein the flavor granules each comprise a core material and a flavor-carrying carrier adhered to the surface of the core material, and wherein the flavor granules have a grain size distribution such that granules having a grain size of 100 μm or larger make up 99% by mass or more of the flavor granules and granules having a grain size of 200 μm or larger make up 70% by mass or more of the flavor granules.