Self-Extinguishing Smoking Article Using Thermally Deactivatable Adhesive
Solution Overview
Problem
Filter cigarettes require users to extinguish the burning coal by manually placing the cigarette in an ashtray, which can leave an unpleasant smell on the fingers and is inconvenient when an ashtray is not available.
Innovation Solution
A smoking article design featuring a tobacco rod with a thermally deactivatable adhesive that attaches to a hollow tube, allowing the tobacco rod to slide into the tube when heated, enabling self-extinguishment without an ashtray, using a thermally deactivatable adhesive that loses adhesion at a specific temperature, allowing the tobacco rod to be drawn into the tube by the consumer's puffs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional filter cigarette design is used, then the manufacturing process is simple and equipment requirements are minimal, but the consumer must manually extinguish the cigarette in an ashtray which is inconvenient and leaves unpleasant smell on fingers
Solution Approach 1:
The tobacco rod is nested within the hollow tube structure, with the affixing portion received inside the inner cavity. This nesting arrangement allows the tobacco rod to be drawn into the hollow tube for self-extinguishment while maintaining a compact overall structure that does not significantly increase device complexity
Solution Approach 2:
The cigarette structure enables self-extinguishment by allowing the consumer to draw the remaining tobacco rod and ash into the hollow tube through continued puffing. The system serves itself by using the consumer's natural smoking action to achieve extinguishment without requiring manual intervention with an ashtray
2Ease of operation
If a thermally deactivatable adhesive is used to attach the tobacco rod to the hollow tube, then the tobacco rod can be drawn into the tube for self-extinguishment, but the adhesive must withstand heating during smoking while remaining attachable
Solution Approach 1:
The adhesive's key parameter - its adhesion strength - is made changeable in response to temperature. The thermally deactivatable adhesive maintains high adhesion at smoking temperatures to secure the tobacco rod, then loses adhesion when exposed to the burning coal's heat, enabling the tobacco rod to be drawn into the hollow tube for extinguishment
3Strength
If the tobacco rod is securely attached to the hollow tube, then the structural integrity is maintained during smoking, but the tobacco rod cannot be drawn into the tube for extinguishment
Solution Approach 1:
The attachment between tobacco rod and hollow tube is made dynamic rather than static. The thermally deactivatable adhesive provides strong attachment during the smoking phase, then becomes detachable when heated by the burning coal, allowing the tobacco rod to be drawn into the hollow tube. This dynamic behavior enables both strong attachment and extinguishment capability
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
Enables easy extinguishment of the cigarette without an ashtray, reducing finger contact and odor transfer, while maintaining a conventional smoking experience and ease of manufacturing without modifying existing equipment.
Implementation Method 1
a thermally deactivatable adhesive provided on an outer surface of the wrapper or on an inner surface of the hollow tube or on both. Thus, upon deactivation of the adhesive, at least a portion of the tobacco rod becomes slidable within the hollow tube in relation to the filter.
Data Source
AI summary
There is provided a smoking article (10) comprising: a tobacco rod (12) comprising a charge (16) of tobacco material circumscribed by a wrapper (18); a filter (14) arranged downstream of the tobacco rod (12); and a hollow tube (20) defining an inner cavity (22) and attaching the filter (14) to the tobacco rod (12). An affixing portion (24) of the tobacco rod (12) is received within the inner cavity (22) and secured to the hollow tube (20) by means of a thermally deactivatable adhesive (26) provided on an outer surface of the wrapper (18) or on an inner surface of the hollow tube (20) or on both. Thus, upon deactivation of the adhesive, at least a portion of the tobacco rod (12) becomes slidable within the hollow tube (20) in relation to the filter (14).