Paper Wrapper with Low Elongation for Aerosol Articles
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Solution Overview
Problem
Aerosol generating articles with heated aerosol generating substrates face issues of paper wrapper degradation due to absorption of aerosol formers and moisture, leading to swelling, staining, and mechanical weakening, which affects the stability and usability of the device.
Innovation Solution
A paper wrapper with a low elongation-to-break ratio of 2.5 or less, combined with a surface treatment of PVOH or silicon, is used to create a grease barrier that prevents absorption of aerosol formers and water, maintaining the structural integrity and appearance of the aerosol generating article.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional paper wrapper is used to wrap the aerosol generating substrate, then the wrapper provides basic containment and structure, but the paper absorbs aerosol formers and moisture leading to swelling, staining, and mechanical weakening
Solution Approach 1:
The patent changes the physical-chemical parameters of the paper by controlling its elongation at break ratio (CD/MD ≤ 2.5), grammage (25-45 gsm), and thickness (35-50 micrometers). These parameter changes make the paper resistant to swelling and staining while maintaining structural integrity when exposed to aerosol formers and moisture.
Solution Approach 2:
The patent creates a composite paper structure with specific fiber composition and bonding characteristics that combine resistance to liquid absorption with adequate mechanical strength. The composite nature of the paper layers provides both containment functionality and resistance to degradation from aerosol components.
2Object-affected harmful factors
If the paper wrapper has high liquid absorption capacity, then it can manage moisture and aerosol formers, but it swells and becomes mechanically weak
Solution Approach 1:
The patent converts the potentially harmful effect of liquid contact into a beneficial property by engineering the paper to have low elongation at break ratio. The paper's restricted dimensional change capability transforms what would normally be swelling and weakening into dimensional stability and maintained mechanical strength despite exposure to aerosol formers and moisture.
3Reliability
If the wrapper is tightly received in the heating device, then secure heating contact is achieved, but removal becomes difficult due to swelling
Solution Approach 1:
By changing the paper's elongation at break ratio to 2.5 or less, the wrapper maintains its dimensional stability during heating, allowing tight reception for reliable heating contact. The same parameter change prevents excessive swelling during use, ensuring easy removal from the heating device without damage.
4Weight of moving object
If the paper wrapper is thin and lightweight, then the aerosol generating article is compact, but the wrapper is more susceptible to breakage
Solution Approach 1:
The patent optimizes the paper's grammage (25-45 gsm) and thickness (35-50 micrometers) to achieve a balance between light weight and break resistance. The key parameter change is the elongation at break ratio (CD/MD ≤ 2.5), which provides exceptional strength-to-weight ratio, allowing the wrapper to be thin and lightweight while maintaining high break resistance.
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 provides a visually and mechanically stable aerosol generating article that resists swelling and staining, ensuring secure insertion and removal from heating devices without burning, while maintaining the taste and quality of the aerosol produced.
Implementation Method 1
The wrapper comprises a paper layer having an elongation at break ratio of cross direction/machine direction (CD/MD) is about 2.5 or less. Preferably, the paper layer comprises PVOH (polyvinyl alcohol) or silicon.
Data Source
AI summary
A wrapper (50) used in aerosol generating articles (10). The paper wrapper has a low elongation to break ratio and is utilized with an aerosol generating substrate (20). The aerosol generating article includes the aerosol generating substrate comprising nicotine and at least 10% aerosol former comprising glycerine. The wrapper is disposed about and in contact with the aerosol generating substrate. The wrapper comprises a paper layer having an elongation at break ratio cross direction/machine direction (CD/MD) of 2.5