Cigarette Paper Non-Linear Airflow Exponent k
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Solution Overview
Problem
Conventional cigarette papers exhibit linear air-flow pressure relationships, limiting the dilution of smoke and reduction of harmful substances, as they maintain air permeability between 10 CU and 300 CU with little variation, failing to effectively reduce harmful smoke components without altering taste or chemical composition.
Innovation Solution
A cigarette paper with a non-linear air-flow pressure relationship, characterized by an exponent k of ≤0.98, achieved by selectively treating the paper with film-forming materials to increase the ratio of large pores, maintaining air permeability above 15 CU and minimizing chemical alterations, thereby enhancing smoke dilution without affecting taste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional cigarette paper with linear air-flow pressure relationship is used, then air permeability is maintained between 10 CU and 300 CU, but smoke dilution is limited and harmful substances cannot be effectively reduced
Solution Approach 1:
The patent changes the pressure exponent parameter k from the conventional range (0.98-1.0) to a lower range (0.90-0.96), which fundamentally alters the air-flow pressure relationship. This parameter change enables the paper to provide greater smoke dilution at typical smoking pressures (0-1 kPa) while maintaining acceptable air permeability, thereby reducing harmful substances without compromising the basic functioning of the cigarette paper.
2Object-affected harmful factors
If air permeability is increased to enhance smoke dilution, then harmful substances are reduced, but air permeability control becomes difficult and taste may be affected
Solution Approach 1:
The patent achieves stable air permeability control by modifying the pressure exponent k to 0.90-0.96, which creates a non-linear air-flow pressure relationship. This allows the paper to maintain air permeability within the acceptable range of 10-300 CU while providing enhanced smoke dilution效果 at typical smoking pressures, thus reducing harmful substances without causing excessive air permeability variation or taste alteration.
3Adaptability or versatility
If non-linear air-flow relationship with lower exponent k is implemented, then smoke dilution is enhanced, but air permeability may drop below acceptable levels
Solution Approach 1:
The patent carefully selects the pressure exponent k to fall within the specific range of 0.90-0.96, which balances smoke dilution enhancement with air permeability maintenance. This optimized parameter range ensures that at typical smoking pressures (0-1 kPa), the paper provides significant smoke dilution while maintaining air permeability above the acceptable threshold of 10 CU, thus achieving both goals simultaneously.
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 non-linear air-flow relationship allows greater smoke dilution and reduction of harmful substances at typical smoking pressures, while maintaining air permeability and chemical integrity, effectively reducing harmful smoke components without adverse taste effects.
Implementation Method 1
a characteristic property of the cigarette paper of great technical importance is its air permeability. It describes the permeability of the paper to an air-flow, which is caused by a pressure difference between the two sides of the paper
Implementation Method 2
achieved by selectively treating the paper with film-forming materials to increase the ratio of large pores
Data Source
AI summary
A cigarette paper is shown which has the following properties over at least a part of its surface: no artificial perforation, the air permeability is at least 15 CU, preferably at least 20 CU, and especially preferably at least 25 CU, and for the exponent k, measured with a measuring head with a rectangular opening of 2 mm by 15 mm, in accordance with ISO 2965:2009, which is defined byk=logQ1Q2logp1p2with Q1: air-flow through the paper at a pressure difference p1=1.00 kPa and Q2: air-flow through the paper at a pressure difference p2=0.25 kPa, the following holds k≦0.98, preferably k≦0.95, especially preferably k≦0.93, and k≧0.80, preferably k≧0.85.