Cellulose Acetate Filter Element for Low Draw Resistance
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Solution Overview
Problem
Existing filter materials for slim and ultra-slim cigarettes face challenges in maintaining sufficient filter hardness, filtration performance, and reducing draw resistance while managing thermal cooling and appearance, with cellulose acetate filaments being inadequate for these requirements.
Innovation Solution
A filter element comprising a filter body made of cross-linked and crimped cellulose acetate filaments with a specific filament titer between 5 to 10 denier, total titer between 5,000 to 10,000 denier, and a specific fiber weight of less than 2.5 mg/mm, featuring hollow or tubular structures, which are designed to maintain high filtration efficiency and hardness without increasing draw resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the filter rod hardness is increased to maintain structural integrity, then the filter hardness is improved, but the draw resistance increases excessively
Solution Approach 1:
The patent applies parameter changes by precisely controlling the filament titer (5-10 denier) and total titer (5,000-10,000 denier) of cellulose acetate filaments, along with specific fiber weight (<2.5 mg/mm), to achieve optimal filter rod hardness while maintaining acceptable draw resistance. This quantitative parameter optimization resolves the contradiction between hardness and drawability.
Solution Approach 2:
The patent uses composite material structure by combining cross-linked and crimped cellulose acetate filaments with hollow or tubular configurations. This composite approach creates a filter material that simultaneously provides structural hardness and controlled porosity, allowing air passage while maintaining rigidity.
2Object-affected harmful factors
If the filtration performance is enhanced to remove more harmful substances, then the filtration efficiency is improved, but the draw resistance increases
Solution Approach 1:
The patent employs porous material structure through hollow and tubular filament configurations that provide controlled porosity. The hollow/tubular design creates internal voids that facilitate air flow while the filament walls provide filtration surface area, achieving high filtration efficiency without excessive draw resistance.
Solution Approach 2:
The patent optimizes filtration performance by controlling specific parameters including filament titer (5-10 denier), total titer (5,000-10,000 denier), and fiber weight (<2.5 mg/mm). These parameter adjustments create a balance between filtration surface area and air permeability, resolving the contradiction between filtration efficiency and draw resistance.
3Ease of operation
If the fiber weight per unit volume is reduced to lower draw resistance, then the draw resistance is improved, but the filter rod hardness decreases
Solution Approach 1:
The patent uses composite material approach by combining low fiber weight (<2.5 mg/mm) with hollow/tubular filament structures. The hollow/tubular configuration provides structural rigidity through geometric strength while the reduced fiber weight maintains low draw resistance, resolving the contradiction between hardness and drawability.
Solution Approach 2:
The patent applies parameter changes by optimizing the relationship between fiber weight, filament titer, and filament structure. The specific combination of low fiber weight with controlled filament dimensions and hollow/tubular geometry creates a filter material that is both soft to draw and hard structurally.
4Ease of manufacture
If conventional cellulose acetate filaments are used, then the manufacturing process is simple, but the filter hardness and filtration performance are insufficient for slim and ultra-slim cigarettes
Solution Approach 1:
The patent applies parameter changes by specifying precise filament characteristics (titer: 5-10 denier, total titer: 5,000-10,000 denier, fiber weight: <2.5 mg/mm) that differ from conventional filaments. These parameter modifications maintain compatibility with existing manufacturing processes while achieving the required filter hardness and filtration performance for slim and ultra-slim cigarettes.
Solution Approach 2:
The patent uses composite material approach by incorporating hollow or tubular structures within the cellulose acetate filaments. This internal structural modification can be integrated into conventional manufacturing processes while significantly enhancing the filter's hardness and filtration capabilities without requiring completely new manufacturing equipment.
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 filter element effectively prevents 'hot collapse' and achieves desired filtration performance, hardness, and cooling, while maintaining low draw resistance, suitable for slim and ultra-slim cigarettes.
Implementation Method 1
the filter element effectively prevents 'hot collapse' and achieves desired filtration performance, hardness, and cooling
Implementation Method 2
a filter element comprising a filter body made of cross-linked and crimped cellulose acetate filaments
Data Source
AI summary
The invention relates to a filter element for mouthpieces for use with smoking products or HNB products, the filter element having a filter body made of a tow material, the tow material being formed by a plurality of individual threads of cross-linked and crimped cellulose acetate filaments, the cellulose acetate filaments having in particular a multilobal or polygonal and preferably Y-shaped cross-sectional geometry. According to the invention: the cellulose acetate filaments of the tow material have a uniform filament titre, which is in particular predetermined or predefinable, in a range of less than or equal to 10 denier (11.1 dtex) and greater than or equal to 5 denier (5.5 dtex); the tow material has a total titre in a range of less than or equal to 10,000 denier (11.1 kdtex) and greater than or equal to 5,000 denier (5,555.5 dtex); and the specific fibre weight of the cellulose acetate filaments of the tow material is less than or equal to 2.5 mg per mm of filter element length and greater than or equal to 1.0 mg per mm of filter element length.