Aerosol-Forming Substrate Composite Binder for Strength and Crust Control
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Solution Overview
Problem
Aerosol-generating articles with hydroxypropylmethyl cellulose exhibit insufficient tensile strength and are prone to melting and forming crusts, which affect their performance and usability.
Innovation Solution
Incorporating hydroxypropylmethyl cellulose with cellulose-based strengthening agents, such as cellulose fibers, microcrystalline cellulose, or cellulose powder, and carboxymethyl cellulose to enhance tensile strength and prevent crusting, while maintaining a low viscosity for easier manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hydroxypropylmethyl cellulose is used as the binder in aerosol-forming substrate, then the substrate exhibits low viscosity and ease of manufacture, but the tensile strength is insufficient and the substrate is prone to melting and crusting
Solution Approach 1:
The patent combines hydroxypropylmethyl cellulose (which provides low viscosity and ease of manufacture) with cellulose-based strengthening agents (such as microcrystalline cellulose, cellulose fibers, or cellulose powder) to create a composite binder system. This composite approach allows the substrate to simultaneously achieve ease of manufacture from the hydroxypropylmethyl cellulose component and improved tensile strength from the cellulose-based strengthening agent component, resolving the technical contradiction between these two properties.
2Ease of manufacture
If hydroxypropylmethyl cellulose is used as the binder in aerosol-forming substrate, then the substrate exhibits low viscosity and ease of manufacture, but the substrate is prone to melting and forming crusts
Solution Approach 1:
The patent creates a composite binder system combining hydroxypropylmethyl cellulose with cellulose-based strengthening agents. The hydroxypropylmethyl cellulose provides the desired low viscosity for ease of manufacture, while the cellulose-based strengthening agents (microcrystalline cellulose, cellulose fibers, or cellulose powder) contribute thermal stability and resistance to melting and crusting, thereby resolving the contradiction between ease of manufacture and reliability.
3Strength
If cellulose-based strengthening agents are added to improve tensile strength, then the substrate strength increases, but the manufacturing complexity increases
Solution Approach 1:
The patent specifies optimized content ranges for the cellulose-based strengthening agents (0.1-10 wt%, preferably 0.5-5 wt%) within the binder composition. By controlling the concentration of these strengthening agents within these parameter ranges, the substrate achieves improved tensile strength while minimizing the increase in manufacturing complexity. This parameter optimization allows the formulation to balance performance improvement with manufacturing feasibility.
Data Source
Figure 1
Figure 2
AI summary
An aerosol-forming substrate (1020) for use in an aerosol-generating system (2000). The aerosol-forming substrate (1020) comprises: one or more aerosol formers; hydroxypropylmethyl cellulose; one or more cellulose based strengthening agents; and carboxymethyl cellulose. The aerosol-forming substrate (1020) has an aerosol former content of greater than 30 percent by weight.