Ventilated Filter Element with Inclined Holes for Uniform Smoke Dilution
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Solution Overview
Problem
Conventional filter-tipped cigarettes suffer from uneven smoke and air mixing at the mouth end, resulting in higher undiluted smoke volumes near the axis and lower air incorporation in radially outer zones, leading to inefficient smoke dilution.
Innovation Solution
A filter element with a ventilating piece having internal channels and inclined holes that allow air to mix with smoke, creating a whirling motion and uniform dilution, is integrated into a smoking article, where the holes are strategically positioned and perforated to ensure optimal airflow and smoke mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If small holes are made radially in the filter to provide ventilation, then air intake is improved, but smoke and air mixing becomes uneven with higher undiluted smoke volumes near the axis
Solution Approach 1:
The filter is divided into multiple functional zones with different hole patterns. The first ring of holes provides primary ventilation while the second ring of holes provides secondary ventilation, creating segmented airflow paths that improve mixing uniformity throughout the filter cross-section.
Solution Approach 2:
Different regions of the filter are given different properties through the use of two distinct rings of holes with different characteristics. The radial distribution and spacing of holes in each ring are optimized to create locally appropriate airflow patterns that collectively achieve uniform overall mixing.
2Quantity of substance
If two rings of holes are used to increase ventilation, then smoke dilution is improved, but manufacturing complexity increases
Solution Approach 1:
Both rings of ventilation holes are integrated into a single filter body structure, combining the functions of primary and secondary ventilation in one unified component. This merging approach achieves enhanced smoke dilution without requiring separate filter elements or complex assembly procedures.
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 achieves uniform smoke and air mixing at the outlet of the filter, enhancing dilution and stability of the smoke flow, resulting in a more consistent smoking experience.
Implementation Method 1
the holes are strategically positioned and perforated to ensure optimal airflow and smoke mixing, creating a whirling motion
Data Source
Figure 1~3
Figure 4~6
AI summary
A filter element (2) for a smoking article (1) of the tobacco industry comprises at least one ventilating piece (6) comprising at least one internal channel (8) and at least one hole (9) having an inlet (10) in communication with an outside surface (11) of the filter element (2) and an outlet (12) in communication with the internal channel (8) in order to ventilate a main flow (F1) of smoke passing through the filter element (2).