Moisture-Resistant Smoking Capsule Shell Design
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Solution Overview
Problem
Existing breakable capsules in smoking devices, typically made of gelatin, lose their breakability due to moisture exposure, making it difficult for smokers to rupture them during smoking, as the crush strength exceeds the desired limit of 2.5 kp.
Innovation Solution
Incorporating selected hydrocolloids into the outer shell or applying a moisture barrier layer, such as gellan gum and a hydrophobic coating, to maintain the capsule's breakability and crush strength within the range of 0.5 to 2.5 kp even in moist conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gelatin is used as the capsule shell material, then the capsule provides good storage properties, but the capsule loses breakability when exposed to moisture during smoking
Solution Approach 1:
The patent uses a composite shell structure combining gelatin with hydrophobic materials (wax, oil, or silicone coating) to create a material that maintains gelatin's storage properties while adding moisture resistance. This composite approach allows the capsule to remain intact during storage yet breakable during smoking operation.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the gelatin shell by controlling gelatin concentration (5-50%), adding plasticizers (1-20% glycerol or sorbitol), and applying hydrophobic coatings. These parameter changes adjust the shell's moisture sensitivity to maintain breakability in humid smoking conditions while preserving storage stability.
2Ease of operation
If the capsule shell is made sufficiently soft to be breakable, then the capsule can be ruptured by finger pressure, but the capsule deforms excessively when exposed to smoking moisture
Solution Approach 1:
The patent optimizes gelatin concentration (5-50%) and plasticizer content (1-20%) to precisely control shell softness and deformation characteristics. This parameter adjustment ensures the shell remains soft enough for finger-actuated breaking while limiting moisture-induced deformation to less than 2/3 of the original diameter.
Solution Approach 2:
The hydrophobic coating layer acts as an intermediary between the gelatin shell and moisture in the smoking environment. This intermediate layer reduces moisture penetration and swelling, thereby limiting deformation while preserving the shell's breakability under finger pressure.
3Shape
If the capsule shell is made stronger to resist deformation, then the capsule maintains its shape in moisture, but the crush strength exceeds the desired limit of 2.5 kp
Solution Approach 1:
The patent carefully adjusts gelatin concentration (5-50%) and plasticizer content (1-20%) to control the shell's mechanical properties, achieving a crush strength between 0.5-2.5 kp. This parameter optimization ensures the shell is strong enough to resist moisture deformation but weak enough to break under finger pressure.
Solution Approach 2:
The capsule shell is designed as a disposable component with controlled strength characteristics. The shell is intentionally made with limited durability (crush strength 0.5-2.5 kp) to ensure it breaks after use, while maintaining sufficient strength during storage and handling in the smoking device.
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 capsules retain their ability to rupture with a crush strength of 0.5 to 2.5 kp and minimal deformation, ensuring consistent release of the core during smoking, even when exposed to moisture, with improved moisture stability and an audible 'pop' upon rupture.
Implementation Method 1
The outer shell or outer coating of the capsule has the ability to retard degradation of the capsule due to the water brought into the smoking device by a smoker
Data Source
Figure 1
Figure 2
AI summary
A smoking device comprising a recipient including or able to receive burning products, preferably tobacco, and a filter element connected to the recipient, wherein said filter comprises at least one breakable capsule, said capsule having a initial crush strength from 0.5 to 2.5 kp, and keeping a crush strength from 0.5 to 2.5 kp and a deformation of less than two third of its diameter prior to rupture after having been submitted to a smoking test . The invention is also relating to the capsule suitable for being incorporated in a smoking device, and to the process of manufacture of said capsule.